diff --git a/app/controllers/homework_common_controller.rb b/app/controllers/homework_common_controller.rb
index 9d5768948..41d302829 100644
--- a/app/controllers/homework_common_controller.rb
+++ b/app/controllers/homework_common_controller.rb
@@ -150,6 +150,10 @@ class HomeworkCommonController < ApplicationController
       @homework.end_time = params[:homework_common][:end_time] || Time.now
       @homework.course_id = params[:course_id]
 
+      homework_detail_manual = @homework.homework_detail_manual || HomeworkDetailManual.new
+      homework_detail_manual.evaluation_start = params[:evaluation_start].blank? ? @homework.end_time + 7 : params[:evaluation_start]
+      homework_detail_manual.evaluation_end = params[:evaluation_end].blank? ? homework_detail_manual.evaluation_start + 7 : params[:evaluation_end]
+
       @homework.save_attachments(params[:attachments])
       render_attachment_warning_if_needed(@homework)
 
diff --git a/app/controllers/projects_controller.rb b/app/controllers/projects_controller.rb
index 95e90d416..4d80efdf3 100644
--- a/app/controllers/projects_controller.rb
+++ b/app/controllers/projects_controller.rb
@@ -259,7 +259,8 @@ class ProjectsController < ApplicationController
   # Author lizanle
   # Description  项目动态展示方法，删除了不必要的代码
   def show
-    update_invite_message(User.current, @project)
+    # 更新消息为已读
+    update_message_status(User.current, @project)
     if params[:jump] && redirect_to_project_menu_item(@project, params[:jump])
       return
     end
@@ -464,12 +465,11 @@ class ProjectsController < ApplicationController
   # by young
   # include CoursesHelper
   def member
-    # 更新消息状态
-    update_invite_message(User.current, @project)
     # 消息"同意加入项目"
     if params[:message_id]
       message_invite(params[:message_id], params[:key])
     end
+    update_message_status(User.current, @project)
     # params[:login]为邮箱邀请用户加入，主要功能：
     # 1、自动注册
     # 2、加入项目、创建角色
@@ -525,18 +525,21 @@ class ProjectsController < ApplicationController
     @members = paginateHelper @members
   end
 
-  def update_invite_message(user, project)
-    forge_invite_messages = ForgeMessage.where("user_id =? and project_id =? and forge_message_type =?", user, project, "ProjectInvite")
-    forge_invite_messages.each do |forge_invite_messages|
-      forge_invite_messages.update_attribute(:viewed, true)
+  def update_message_status(user, project)
+    project_invite_messages = ForgeMessage.where("user_id =? and project_id =? and forge_message_type =?", user, project, "ProjectInvite")
+    project_invite_messages.each do |project_invite_message|
+      project_invite_message.update_attribute(:viewed, true)
     end
   end
 
   def message_invite(message_id, key)
     forge_message = ForgeMessage.find(message_id)
     if key == forge_message.secret_key
-      Member.create(:role_ids => [4], :user_id => forge_message.user_id, :project_id => forge_message.project_id)
-      UserGrade.create(:user_id => forge_message.user_id, :project_id => forge_message.project_id)
+      # 情况：用户收到邀请邮件还没看，但是管理员已经把该用户添加进项目
+      if Member.where("user_id =? and project_id =?",forge_message.user_id, forge_message.project_id).first.nil?
+        Member.create(:role_ids => [4], :user_id => forge_message.user_id, :project_id => forge_message.project_id)
+        UserGrade.create(:user_id => forge_message.user_id, :project_id => forge_message.project_id)
+      end
     end
   end
 
diff --git a/app/controllers/student_work_controller.rb b/app/controllers/student_work_controller.rb
index 251fd80c4..90a0f3ed6 100644
--- a/app/controllers/student_work_controller.rb
+++ b/app/controllers/student_work_controller.rb
@@ -77,28 +77,60 @@ class StudentWorkController < ApplicationController
     @is_teacher = User.current.allowed_to?(:as_teacher,@course) || User.current.admin?
     @is_evaluation = @homework.homework_detail_manual.comment_status == 2 && !@is_teacher #是不是匿评
     @show_all = false
-    if @is_teacher   #老师 || 超级管理员 显示所有列表
-      @stundet_works = search_homework_member @homework.student_works.select("student_works.*,IF(final_score is null,null,final_score - absence_penalty - late_penalty) as score").order("#{@order} #{@b_sort}"),@name
-      @show_all = true
-    elsif @homework.homework_detail_manual.comment_status == 1  #学生 && 未开启匿评 只看到自己的
-      @stundet_works = @homework.student_works.select("student_works.*,IF(final_score is null,null,final_score - absence_penalty - late_penalty) as score").where(:user_id => User.current.id)
-    elsif @homework.homework_detail_manual.comment_status == 2  #学生 && 开启匿评  看到匿评列表
-      my_work = @homework.student_works.where(:user_id => User.current.id)
-      @stundet_works = my_work + User.current.student_works_evaluation_distributions.map(&:student_work).select { |work| work.homework_common_id == @homework.id}
-    elsif @homework.homework_detail_manual.comment_status == 3  #学生 && 关闭匿评  未提交作品之前列表为空，提交了作品看到所有的
-      my_work = @homework.student_works.select("student_works.*,IF(final_score is null,null,final_score - absence_penalty - late_penalty) as score").where(:user_id => User.current.id)
-      if my_work.empty?
-        @stundet_works = []
+
+    course_group = CourseGroup.find_by_id(@group) if @group
+    if course_group
+      group_students = course_group.users
+      if group_students.empty?
+        student_in_group = '(0)'
       else
-        @stundet_works = search_homework_member @homework.student_works.select("student_works.*,IF(final_score is null,null,final_score - absence_penalty - late_penalty) as score").order("#{@order} #{@b_sort}"),@name
+        student_in_group = '(' + group_students.map{|user| user.id}.join(',')  + ')'
+      end
+      if @is_teacher   #老师 || 超级管理员 显示所有列表
+        @stundet_works = search_homework_member @homework.student_works.select("student_works.*,IF(final_score is null,null,final_score - absence_penalty - late_penalty) as score").joins(:user).where("users.id in #{student_in_group}").order("#{@order} #{@b_sort}"),@name
         @show_all = true
+      elsif @homework.homework_detail_manual.comment_status == 1  #学生 && 未开启匿评 只看到自己的
+        @stundet_works = @homework.student_works.select("student_works.*,IF(final_score is null,null,final_score - absence_penalty - late_penalty) as score").where(:user_id => User.current.id)
+      elsif @homework.homework_detail_manual.comment_status == 2  #学生 && 开启匿评  看到匿评列表
+        my_work = @homework.student_works.where(:user_id => User.current.id)
+        @stundet_works = my_work + User.current.student_works_evaluation_distributions.map(&:student_work).select { |work| work.homework_common_id == @homework.id}
+      elsif @homework.homework_detail_manual.comment_status == 3  #学生 && 关闭匿评  未提交作品之前列表为空，提交了作品看到所有的
+        my_work = @homework.student_works.select("student_works.*,IF(final_score is null,null,final_score - absence_penalty - late_penalty) as score").where(:user_id => User.current.id)
+        if my_work.empty?
+          @stundet_works = []
+        else
+          @stundet_works = search_homework_member @homework.student_works.select("student_works.*,IF(final_score is null,null,final_score - absence_penalty - late_penalty) as score").joins(:user).where("users.id in #{student_in_group}").order("#{@order} #{@b_sort}"),@name
+          @show_all = true
+        end
+      else
+        @stundet_works = []
       end
     else
-      @stundet_works = []
+      if @is_teacher   #老师 || 超级管理员 显示所有列表
+        @stundet_works = search_homework_member @homework.student_works.select("student_works.*,IF(final_score is null,null,final_score - absence_penalty - late_penalty) as score").order("#{@order} #{@b_sort}"),@name
+        @show_all = true
+      elsif @homework.homework_detail_manual.comment_status == 1  #学生 && 未开启匿评 只看到自己的
+        @stundet_works = @homework.student_works.select("student_works.*,IF(final_score is null,null,final_score - absence_penalty - late_penalty) as score").where(:user_id => User.current.id)
+      elsif @homework.homework_detail_manual.comment_status == 2  #学生 && 开启匿评  看到匿评列表
+        my_work = @homework.student_works.where(:user_id => User.current.id)
+        @stundet_works = my_work + User.current.student_works_evaluation_distributions.map(&:student_work).select { |work| work.homework_common_id == @homework.id}
+      elsif @homework.homework_detail_manual.comment_status == 3  #学生 && 关闭匿评  未提交作品之前列表为空，提交了作品看到所有的
+        my_work = @homework.student_works.select("student_works.*,IF(final_score is null,null,final_score - absence_penalty - late_penalty) as score").where(:user_id => User.current.id)
+        if my_work.empty?
+          @stundet_works = []
+        else
+          @stundet_works = search_homework_member @homework.student_works.select("student_works.*,IF(final_score is null,null,final_score - absence_penalty - late_penalty) as score").order("#{@order} #{@b_sort}"),@name
+          @show_all = true
+        end
+      else
+        @stundet_works = []
+      end
     end
+
     @score = @b_sort == "desc" ? "asc" : "desc"
 
     respond_to do |format|
+      format.js
       format.html
       format.xls {
         send_data(homework_to_xls(@stundet_works), :type => "text/excel;charset=utf-8; header=present",
diff --git a/app/controllers/users_controller.rb b/app/controllers/users_controller.rb
index 0783d1805..76643a099 100644
--- a/app/controllers/users_controller.rb
+++ b/app/controllers/users_controller.rb
@@ -468,8 +468,8 @@ class UsersController < ApplicationController
         homework_detail_manual = HomeworkDetailManual.new
         homework_detail_manual.ta_proportion = homework.homework_type == 1 ? 0.6 : 0.3
         homework_detail_manual.comment_status = 1
-        homework_detail_manual.evaluation_start = Time.now
-        homework_detail_manual.evaluation_end = Time.now
+        homework_detail_manual.evaluation_start = params[:evaluation_start].blank? ? homework.end_time + 7 : params[:evaluation_start]
+        homework_detail_manual.evaluation_end = params[:evaluation_end].blank? ? homework_detail_manual.evaluation_start + 7 : params[:evaluation_end]
         homework_detail_manual.evaluation_num = params[:evaluation_num] || 3
         homework_detail_manual.absence_penalty = 5
         homework.homework_detail_manual = homework_detail_manual
diff --git a/app/models/student_work_test.rb b/app/models/student_work_test.rb
index 1cfb7f8b2..0246ecabf 100644
--- a/app/models/student_work_test.rb
+++ b/app/models/student_work_test.rb
@@ -45,7 +45,7 @@ class StudentWorkTest < ActiveRecord::Base
   private
   def get_success_count
     self.results.inject(0) do |sum, result|
-      sum += (result["status"].to_i == 0 ? 1 : 0)
+      sum += (result["status"] && result["status"].to_i == 0 ? 1 : 0)
     end || 0
   end
 
diff --git a/app/views/boards/_course_show.html.erb b/app/views/boards/_course_show.html.erb
index f117acd7f..db174f30e 100644
--- a/app/views/boards/_course_show.html.erb
+++ b/app/views/boards/_course_show.html.erb
@@ -99,7 +99,7 @@
 //                }
               });
             </script>
-            <div  class="project_board_content break_word f14" id="content_<%=topic.id%>">
+            <div  class="project_board_content break_word f14 list_style" id="content_<%=topic.id%>">
               <div id="contentmessage<%=topic.id %>" class="upload_img">
                 <%= topic.content.html_safe %>
                 <!-- -->
@@ -165,7 +165,7 @@
                           <div class="Msg_txt">
                             <%= link_to User.current.member_of_course?(@board.course) ? "#{message.author.show_name}(#{message.author.login})" : "#{message.author}", user_path(message.author),:class => 'fl c_orange f14 ' %>
                             <br/>
-                            <div class="fl break_word f14">
+                            <div class="fl break_word f14 list_style">
                               <%= textAreailizable message,:content,:attachments => message.attachments %>
                               <!-- -->
                             </div>
diff --git a/app/views/boards/_project_show.html.erb b/app/views/boards/_project_show.html.erb
index bc69e2666..3cfd4ae72 100644
--- a/app/views/boards/_project_show.html.erb
+++ b/app/views/boards/_project_show.html.erb
@@ -92,7 +92,7 @@
                 </script>
 
               <div class="cl"></div>
-              <div  class="project_board_content break_word f14" id="content_<%=topic.id%>">
+              <div  class="project_board_content break_word f14 list_style" id="content_<%=topic.id%>">
                 <div id="contentmessage<%=topic.id %>" class="upload_img">
                   <%= topic.content.html_safe %>
                   <!-- -->
@@ -150,7 +150,7 @@
                             <div class="Msg_txt">
                               <%= link_to_user_header message.author,false,:class => 'fl c_orange f14 ' %>
                               <br/>
-                              <div class="fl break_word f14">
+                              <div class="fl break_word f14 list_style">
                                 <%= textAreailizable message,:content,:attachments => message.attachments %>
                                 <!-- -->
                               </div>
diff --git a/app/views/courses/show.html.erb b/app/views/courses/show.html.erb
index 6eb722981..eceb29f34 100644
--- a/app/views/courses/show.html.erb
+++ b/app/views/courses/show.html.erb
@@ -7,7 +7,7 @@
       <a class="problem_pic fl">
         <%= image_tag(url_to_avatar(activity.user), :width => "42", :height => "42") %>
       </a>
-      <div class="problem_txt fl mt5 upload_img">
+      <div class="problem_txt fl mt5 upload_img list_style">
         <%= link_to_user_header(activity.user,false,:class => 'problem_name c_orange fl') %>
         <span class="fl"> &nbsp;</span>
         <span class="fl"> <%= activity.course_act_type == "Course" ? "创建了课程" : l(:label_new_activity) %>：</span>
diff --git a/app/views/homework_common/_homework_detail_manual_form.html.erb b/app/views/homework_common/_homework_detail_manual_form.html.erb
deleted file mode 100644
index 59294f82d..000000000
--- a/app/views/homework_common/_homework_detail_manual_form.html.erb
+++ /dev/null
@@ -1,110 +0,0 @@
-<ul class="hwork_new_basic mb10">
-  <li>
-    <label class="label02 mb20">
-      <span class="c_red">*</span>
-      &nbsp;<%= l(:field_name)%>：&nbsp;
-    </label>
-    <input  type="text" name="homework_common[name]" id="homework_name" class="w548 h26  fl" maxlength="255" onkeyup="regex_homework_name();" value="<%= homework.name%>" >
-    <p id="homework_name_span" class="c_red ml110"></p>
-  </li>
-  <div class="cl"></div>
-  <li >
-    <label class="label02 ">&nbsp;&nbsp;&nbsp;<%= l(:field_quote)%>：&nbsp;</label>
-    <div style="width: 83%;float: left;">
-      <% if edit_mode %>
-          <%= f.kindeditor :description,:editor_id => 'homework_description_editor',:owner_id => homework.id,:owner_type =>OwnerTypeHelper::HOMEWORKCOMMON %>
-      <% else %>
-          <%= hidden_field_tag :asset_id,params[:asset_id],:required => false,:style => 'display:none' %>
-          <%= f.kindeditor :description,:editor_id => 'homework_description_editor' %>
-      <% end %>
-    </div>
-  </li>
-  <div class="cl"></div>
-  <li class="mt10">
-    <label class="label02">&nbsp;&nbsp;附件：&nbsp;</label>
-    <%= render :partial => 'attachments/new_form', :locals => {:container => homework} %>
-  </li>
-  <div class="cl"></div>
-  <li class="fl">
-    <label class="label02">
-      <span class="c_red">*</span>
-      &nbsp;<%= l(:label_limit_time)%>：&nbsp;
-    </label>
-    <input  type="text" name="homework_common[end_time]" id="homework_end_time" class="hwork_input02 fl" readonly="readonly" value="<%= homework.end_time%>" >
-    <%= calendar_for('homework_end_time')%>
-    <div class="cl"></div>
-  </li>
-  <li class="fl ml100" style="display: none;">
-    <label class="label02">&nbsp;发布日期：&nbsp;</label>
-    <input  type="text" name="homework_common[publish_time]" id="homework_publish_time" class="hwork_input02 fl" readonly="readonly" value="<%= homework.publish_time%>" >
-    <%= calendar_for('homework_publish_time')%>
-    <div class="cl"></div>
-  </li>
-  <div class="cl"></div>
-</ul><!--hwork_new_basic end--->
-<div class="hwork_new_set" >
-  <p class="fl ml20 f14 mb10 c_orange">基本规则设置（总分为100分）</p>
-  <div class="cl"></div>
-    <ul class="ml10">
-      <li>
-        <label class="label02">迟交扣分：&nbsp;</label>
-        <%#= select_tag :late_penalty,options_for_select(late_penalty_option,homework.late_penalty), {:class => "fl mb10 h26 w70"}  %>
-        <input type="number" value="<%= homework.late_penalty%>" min="0" max="50" class="fl mb10 h26 w70" name="late_penalty" onkeyup="check_late_penalty()">
-        <span class="fl mt5">&nbsp;分</span>
-        <div class="cl"></div>
-      </li>
-      <li style="display: none;">
-        <label class="label02" >是否匿评：&nbsp;</label>
-        <%= f.check_box :homework_type, :class => "mb10 mt5 fl" %>
-        <div class="cl"></div>
-      </li>
-      <li >
-        <label class="label02">评分比例：&nbsp;</label>
-        <%= select_tag :ta_proportion,options_for_select(ta_proportion_option,homework.homework_detail_manual.ta_proportion), {:class => "fl mb10 h26 w70"}  %>
-        <span class="ml5 fl mt5">×&nbsp;教辅评分</span>
-        <span class="ml5 fl mt5">&nbsp;&nbsp;+&nbsp;&nbsp;</span>
-        <input type="text" id="student_proportion" value="<%= (100 - homework.homework_detail_manual.ta_proportion* 100).to_i%>%" class="fl mb10 h26 w70" readonly>
-        <span class="ml5 fl mt5">×&nbsp;匿评得分</span>
-        <span class="ml5 fl mt5">=&nbsp;学生得分</span>
-        <div class="cl"></div>
-      </li>
-      <li >
-        <label class="label02" >&nbsp;&nbsp;</label>
-        <span class=" fl  c_red">如果教师对学生作品进行了评分，则教师评分为学生最终得分。</span>
-        <div class="cl"></div>
-      </li>
-    </ul>
-</div><!--hwork_new_set end-->
-
-<div class="hwork_new_set" id="evaluation_setting" >
-  <p class="fl ml20 f14 mb10 c_orange">学生互评设置</p>
-  <div class="cl"></div>
-  <ul class="ml10">
-    <li style="display: none;">
-      <label class="label02">互评启动时间：&nbsp;</label>
-      <input  type="text" name="evaluation_start" id="evaluation_start_time" class="hwork_input02 fl" readonly="readonly" value="<%= homework.homework_detail_manual.evaluation_start%>" >
-      <%= calendar_for('evaluation_start_time')%>
-      <div class="cl"></div>
-    </li>
-    <li style="display: none;">
-      <label class="label02">互评结束时间：&nbsp;</label>
-      <input  type="text" name="evaluation_end" id="evaluation_end_time" class="hwork_input02 fl" readonly="readonly" value="<%= homework.homework_detail_manual.evaluation_end%>" >
-      <%= calendar_for('evaluation_end_time')%>
-      <div class="cl"></div>
-    </li>
-    <li >
-      <label class="label02">匿评分配数：&nbsp;</label>
-      <input  type="text" name="evaluation_num" id="evaluation_num" class=" hwork_input02 fl"  value="<%= homework.homework_detail_manual.evaluation_num%>" maxlength="2" onkeyup="regex_evaluation_num()">
-      <p class="ml5 fl mt5" id="evaluation_num_notice">每个学生将收到<span class="c_red">&nbsp;3&nbsp;</span>份待匿评作品</p>
-      <div class="cl"></div>
-    </li>
-
-    <li>
-      <label class="label02">缺评扣分：&nbsp;</label>
-      <%= select_tag :absence_penalty,options_for_select(absence_penalty_option,homework.homework_detail_manual.absence_penalty), {:class => "fl mb10 h26 w70"}  %>
-      <span class="fl mt5">&nbsp;分</span>
-      <p class="ml5 fl mt5">学生漏评1个作品将扣<span class="c_red" id="absence_penalty_notice">&nbsp;<%= homework.homework_detail_manual.absence_penalty%>&nbsp;</span>分</p>
-      <div class="cl"></div>
-    </li>
-  </ul> <!-- h1 end--->
-</div><!--hwork_new_set end-->
\ No newline at end of file
diff --git a/app/views/homework_common/_homework_detail_programing_form.html.erb b/app/views/homework_common/_homework_detail_programing_form.html.erb
deleted file mode 100644
index 829905327..000000000
--- a/app/views/homework_common/_homework_detail_programing_form.html.erb
+++ /dev/null
@@ -1,193 +0,0 @@
-<ul class="hwork_new_basic">
-  <li >
-    <label class="label02 mb20">
-      <span class="c_red">*</span>
-      &nbsp;<%= l(:field_name)%>：&nbsp;
-    </label>
-    <input  type="text" name="homework_common[name]" id="homework_name" class="w548 h26  fl" maxlength="255" onkeyup="regex_homework_name();" value="<%= homework.name%>" >
-    <p id="homework_name_span" class="c_red ml110"></p>
-  </li>
-  <div class="cl"></div>
-  <li >
-    <label class="label02 ">&nbsp;&nbsp;&nbsp;<%= l(:field_quote)%>：&nbsp;</label>
-    <div style="width: 83%;float: left;">
-      <% if edit_mode %>
-          <%= f.kindeditor :description,:editor_id => 'homework_description_editor',:owner_id => homework.id,:owner_type =>OwnerTypeHelper::HOMEWORKCOMMON %>
-      <% else %>
-          <%= hidden_field_tag :asset_id,params[:asset_id],:required => false,:style => 'display:none' %>
-          <%= f.kindeditor :description,:editor_id => 'homework_description_editor' %>
-      <% end %>
-    </div>
-  </li>
-  <div class="cl"></div>
-  <li class="mt10">
-    <label class="label02">&nbsp;&nbsp;附件：&nbsp;</label>
-    <%= render :partial => 'attachments/new_form', :locals => {:container => homework} %>
-  </li>
-  <div class="cl"></div>
-  <li class="fl">
-    <label class="label02">
-      <span class="c_red">*</span>
-      &nbsp;<%= l(:label_limit_time)%>：&nbsp;
-    </label>
-    <input  type="text" name="homework_common[end_time]" id="homework_end_time" class="hwork_input02 fl" readonly="readonly" value="<%= homework.end_time%>" >
-    <%= calendar_for('homework_end_time')%>
-    <div class="cl"></div>
-  </li>
-  <li class="fl ml100" style="display: none;">
-    <label class="label02">&nbsp;发布日期：&nbsp;</label>
-    <input  type="text" name="homework_common[publish_time]" id="homework_publish_time" class="hwork_input02 fl" readonly="readonly" value="<%= homework.publish_time%>" >
-    <%= calendar_for('homework_publish_time')%>
-    <div class="cl"></div>
-  </li>
-
-  <li>
-    <label class="label02">迟交扣分：&nbsp;</label>
-    <%#= select_tag :late_penalty,options_for_select(late_penalty_option,homework.late_penalty), {:class => "fl mb10 h26 w70"}  %>
-    <input type="number" value="<%= homework.late_penalty%>" min="0" max="50" class="fl mb10 h26 w70" name="late_penalty" onkeyup="check_late_penalty()">
-    <span class="fl mt5">&nbsp;分</span>
-    <div class="cl"></div>
-  </li>
-</ul><!--hwork_new_basic end--->
-
-<div class="cl"></div>
-<div class="hwork_new_set">
-  <p class="fl ml20 f14 mb10 c_orange">编程评测设置</p>
-  <div class="cl"></div>
-  <ul>
-    <li >
-      <label class="label02">&nbsp;开发语言：&nbsp;</label>
-      <%= select_tag :language,options_for_select(programing_languages_options,homework.homework_detail_programing.language.to_i), {:class => "fl mb10 h26 w70",:onchange => "homework_language_change($(this));"}  %>
-      <div class="cl"></div>
-    </li>
-
-    <li >
-      <label class="label02">评分比例：&nbsp;</label>
-      <%= select_tag :ta_proportion,options_for_select(ta_proportion_option,homework.homework_detail_programing.ta_proportion), {:class => "fl mb10 h26 w70"}  %>
-      <span class="ml5 fl mt5">×&nbsp;教辅评分</span>
-      <span class="ml5 fl mt5">&nbsp;&nbsp;+&nbsp;&nbsp;</span>
-      <input type="text" id="student_proportion" value="<%= (100 - homework.homework_detail_programing.ta_proportion* 100).to_i%>%" class="fl mb10 h26 w70" readonly>
-      <span class="ml5 fl mt5">×&nbsp;系统评分</span>
-      <span class="ml5 fl mt5">=&nbsp;学生得分</span>
-      <div class="cl"></div>
-    </li>
-    <li >
-      <label class="label02" >&nbsp;&nbsp;</label>
-      <span class=" fl  c_red">如果教师对学生作品进行了评分，则教师评分为学生最终得分。</span>
-      <div class="cl"></div>
-    </li>
-
-    <li >
-      <label class="label02">&nbsp;标准代码：&nbsp;</label>
-      <textarea  name="standard_code"  class=" w547 h400 mb10 fl" oninput="init_programing_test();" onpropertychange="init_programing_test()"><%= homework.homework_detail_programing.standard_code || c_stantard_code_teacher%></textarea>
-      <div class="cl"></div>
-    </li>
-
-    <% if edit_mode %>
-        <% homework.homework_tests.each do |homework_test|%>
-            <div>
-              <li>
-                <label class="label02">&nbsp;测试输入：&nbsp;</label>
-                <input type="text" class="fl h26 w190 mb10" name="input[<%= homework_test.id%>]" value="<%= homework_test.input%>"/>
-              </li>
-              <li >
-                <label class=" fl f14 ml10">&nbsp;输出：&nbsp;</label>
-                <input type="text" class="fl h26 w190  mb10" name="output[<%= homework_test.id%>]" value="<%= homework_test.output%>"/>
-              </li>
-              <li>
-                <a class="icon_add ml10 " href="javascript:void(0);" title="添加测试" onclick="add_programing_test($(this).parent().parent())"></a>
-                <a class="icon_remove" href="javascript:void(0);" title="删除测试" onclick="remove_programing_test($(this).parent().parent())"></a>
-                <% if homework_test.result && !homework_test.result.to_s.empty?%>
-                    <% if homework_test.result == 0%>
-                        <a class="green_btn fl ml5 mt1 programing_test" onclick="programing_test('<%= homework_test.id%>')" id="test_send_<%= homework_test.id%>">正确</a>
-                    <% else%>
-                        <a class="red_btn fl ml5 mt1 programing_test" onclick="programing_test('<%= homework_test.id%>')" id="test_send_<%= homework_test.id%>">错误</a>
-                    <% end%>
-                <% else%>
-                    <a class="blue_btn fl ml5 mt1 programing_test" onclick="programing_test('<%= homework_test.id%>')" id="test_send_<%= homework_test.id%>">测试</a>
-                <% end%>
-                <input type="hidden"  id="test_result_<%= homework_test.id%>" name="result[<%= homework_test.id%>]"  value="<%= homework_test.result%>"/>
-              </li>
-              <div class="cl"></div>
-            </div>
-        <% end%>
-    <% else %>
-        <div>
-          <li>
-            <label class="label02">&nbsp;测试输入：&nbsp;</label>
-            <input type="text" class="fl h26 w190 mb10" name="input[0]" value="1 2"/>
-          </li>
-          <li >
-            <label class=" fl f14 ml10">&nbsp;输出：&nbsp;</label>
-            <input type="text" class="fl h26 w190  mb10" name="output[0]" value="3"/>
-          </li>
-          <li>
-            <a class="icon_add ml10 " href="javascript:void(0);" title="添加测试" onclick="add_programing_test($(this).parent().parent())"></a>
-            <a class="icon_remove" href="javascript:void(0);" title="删除测试" onclick="remove_programing_test($(this).parent().parent())"></a>
-            <a class="blue_btn fl ml5 mt programing_test" onclick="programing_test('0')" id="test_send_0">测试</a>
-            <input type="hidden"  id="test_result_0" name="result[0]"  />
-          </li>
-          <div class="cl"></div>
-        </div>
-    <% end %>
-    <input type="hidden" name="error_msg" id="homework_test_error_msg" value="<%= homework.homework_tests.first.error_msg if homework.homework_tests.first && homework.homework_tests.first && homework.homework_tests.first.error_msg%>">
-    <table class="border_ce" cellpadding="0" cellspacing="0" id="homework_work_test_show" style="display: <%= homework.homework_tests.first && homework.homework_tests.first && homework.homework_tests.first.error_msg && !homework.homework_tests.first.error_msg.empty? ? "block" : "none"%>">
-      <tbody>
-      <tr class="border_t" >
-        <td  class="td_end fb c_red w60 td_board_left">
-          错误信息:
-        </td>
-        <td  class="td_end wl" id="homework_work_test_desc">
-          <% if  homework.homework_tests.first && homework.homework_tests.first && homework.homework_tests.first.error_msg %>
-            <%= homework.homework_tests.first.error_msg%>
-          <% end%>
-        </td>
-      </tr>
-      </tbody>
-    </table>
-  </ul>
-</div>
-
-<script type="text/javascript">
-
-    //点击测试，发送
-    function programing_test(obj) {
-        $.post(
-                '<%= programing_test_homework_common_index_path%>',
-                {
-                    src: $("textarea[name='standard_code']").val(),
-                    input: $("input[name='input[" + obj +"]']").val(),
-                    output: $("input[name='output[" + obj + "]']").val(),
-                    language: $("select[name='language']").val(),
-                    index: obj
-                },
-                function (data) {
-
-                }
-        );
-    }
-
-    function init_programing_test()
-    {
-        $(".programing_test").each(function(){
-            $(this).removeClass("green_btn red_btn").addClass("blue_btn").text("测试");
-            $(this).next("input").val("");
-        });
-    }
-
-    function homework_language_change(obj)
-    {
-        if(obj.val() == "1")
-        {
-//            alert(1);
-            $("textarea[name='standard_code']").val("<%= escape_javascript c_stantard_code_teacher%>");
-
-        }
-        else if(obj.val() == "2")
-        {
-//            alert(2);
-            $("textarea[name='standard_code']").val("<%= escape_javascript c_stantard_code_teacher_%>");
-
-        }
-    }
-</script>
\ No newline at end of file
diff --git a/app/views/homework_common/_new_homework_detail_manual_form.html.erb b/app/views/homework_common/_new_homework_detail_manual_form.html.erb
deleted file mode 100644
index af5a8bf50..000000000
--- a/app/views/homework_common/_new_homework_detail_manual_form.html.erb
+++ /dev/null
@@ -1,74 +0,0 @@
-<div class="homepageRight">
-  <div class="HomeWork">
-    <div class="RightBanner">
-      <div class="NewsBannerName">发布作业</div>
-    </div>
-    <div class="HomeWorkCon">
-        <div class="mt15">
-            <textarea class="InputBox  W700 " placeholder="请输入作业标题" name="homework_common[name]" id="homework_name" maxlength="255" onkeyup="regex_homework_name();" value="<%= homework.name%>"></textarea>
-        </div>
-        <div class=" mt10">
-            <a href="javascript:void(0);" class="BlueCirBtn fl mr10">导入作业</a>
-            <input  type="text" name="homework_common[end_time]" id="homework_end_time" class="InputBox fl W120 date-input" readonly="readonly" value="<%= homework.end_time%>" placeholder="截止日期"></input>
-                <div class="fl DateBorder mr10"><a href="javascript:void(0);" class="pic_date"></a></div>
-                <input  type="text" name="homework_common[publish_time]" id="homework_publish_time" class="InputBox fl W120 date-input" readonly="readonly" value="<%= homework.publish_time%>" placeholder="发布日期"></input>
-                <div class="fl DateBorder"><a href="javascript:void(0);" class="pic_date"></a></div>
-            <div class="cl"></div>
-        </div>
-        <div class="mt10">
-        <% if edit_mode %>
-            <%= f.kindeditor :description,:editor_id => 'homework_description_editor',:owner_id => homework.id,:owner_type =>OwnerTypeHelper::HOMEWORKCOMMON %>
-        <% else %>
-            <%= hidden_field_tag :asset_id,params[:asset_id],:required => false,:style => 'display:none' %>
-            <%= f.kindeditor :description,:editor_id => 'homework_description_editor' %>
-        <% end %>
-        </div>
-        <div class="mt10">
-            <textarea class="InputBox  W700 SearchIcon" placeholder="发送到课程" style="margin-top: 0px; margin-bottom: 0px; height: 29px;"></textarea>
-        </div>
-        <div class="mt5">
-            <a href="javascript:void(0);" class="AnnexBtn fl mt3 mr20">上传附件</a>
-            <a href="javascript:void(0);" class="FilesBtn fl mr15 mt3">资源库</a>
-            <div class="cl"></div>
-        </div>
-        
-        <div class="mt10">
-            <a href="javascript:void(0);" class=" fl DropBtn">高级功能</a>
-            <div class="DropLine"></div>
-            <div class="cl"></div>
-        </div>
-        <div class="advanced_option" style="display:none;">
-          <div class="mt10">
-              <select class="InputBox W120" required="true">
-                  <option value="语言选择">语言选择</option>
-                  <option value="C语言">C语言</option>
-                  <option value="C++">C++</option>
-                </select>
-          </div>
-          
-          <div class="mt10">
-              <textarea class="InputBox  W320 fl mr10" placeholder="测试输入" required></textarea><textarea class="InputBox  W320  fl mr5" placeholder="测试输出" required></textarea>
-              <a href="javascript:void(0);" class=" fl icon_add" title="增加测试组"></a>
-              <a href="javascript:void(0);" class=" fl icon_remove" title="删除测试组"></a>
-              <div class="cl"></div>
-          </div>
-        </div>
-        <div class="mt10">
-            <a href="javascript:void(0);" onClick="submit_homework('new_homework_common');" class="BlueCirBtnMini fr">发布</a>
-            <span class="fr mr10 mt3">或</span><%= link_to '取消',homework_common_index_path(:course => @course.id),:class => 'fr mr10 mt3'%>
-            <div class="cl"></div>
-        </div>
-    </div>
-  </div><!----HomeWork end-->
-  
-</div>
-
-<script id="t:test-answer-list" type="text/html">
-  <div class="mt10">
-      <textarea class="InputBox  W320 fl mr10" placeholder="测试输入" required></textarea><textarea class="InputBox  W320  fl mr5" placeholder="测试输出" required></textarea>
-      <a href="javascript:void(0);" class=" fl icon_add" title="增加测试组"></a>
-      <a href="javascript:void(0);" class=" fl icon_remove" title="删除测试组"></a>
-      <div class="cl"></div>
-  </div>
-</script>
-
diff --git a/app/views/homework_common/index.html.erb b/app/views/homework_common/index.html.erb
index 2e680d6ea..4bf3d1781 100644
--- a/app/views/homework_common/index.html.erb
+++ b/app/views/homework_common/index.html.erb
@@ -37,7 +37,7 @@
             $(function(){if($("#bid_description_<%= homework.id%>_content").height()>360){$("#bid_show_more_des_button<%= homework.id%>").show();}});
         </script>
         <div  id="bid_description_<%= homework.id%>" class="news_description mt5">
-          <div id="bid_description_<%= homework.id%>_content" class="upload_img">
+          <div id="bid_description_<%= homework.id%>_content" class="upload_img list_style">
             <%= homework.description.html_safe %>
           </div>
         </div>
diff --git a/app/views/homework_common/new.html.erb b/app/views/homework_common/new.html.erb
deleted file mode 100644
index 6fc0fff0e..000000000
--- a/app/views/homework_common/new.html.erb
+++ /dev/null
@@ -1,17 +0,0 @@
-<%= javascript_include_tag "/assets/kindeditor/kindeditor" %>
-<%= error_messages_for 'homework_common' %>
-<div class="project_r_h">
-  <h2 class="project_h2">
-    <%= l(:label_course_homework_new)%>
-  </h2>
-</div>
-<div class="hwork_new">
-  <%= labelled_form_for @homework,:url => {:controller => 'homework_common',:action => 'create'} do |f| %>
-      <%= hidden_field_tag "course",@course.id%>
-      <%= render :partial => 'homework_common/homework_detail_manual_form', :locals => { :homework => @homework,:f => f,:edit_mode => false } %>
-      <a href="javascript:void(0)" class="blue_btn fl mr10" onClick="submit_homework('new_homework_common');" >提交</a>
-      <%#= link_to "上一步", new_homework_common_path(:course => @course.id), :class => "orange_btn_homework fl"%>
-      <%= link_to '取消',homework_common_index_path(:course => @course.id),:class => 'grey_btn fl'%>
-  <% end%>
-</div><!--hwork_new end-->
-<div class="cl"></div>
diff --git a/app/views/homework_common/next_step.html.erb b/app/views/homework_common/next_step.html.erb
deleted file mode 100644
index 7ed852fea..000000000
--- a/app/views/homework_common/next_step.html.erb
+++ /dev/null
@@ -1,30 +0,0 @@
-<%= javascript_include_tag "/assets/kindeditor/kindeditor",'/assets/kindeditor/pasteimg'  %>
-<%= error_messages_for 'homework_common' %>
-<div class="project_r_h">
-  <h2 class="project_h2">
-    <%= l(:label_course_homework_new)%>
-  </h2>
-</div>
-<% if @homework_type == "1"%>
-    <div class="hwork_new">
-      <%= labelled_form_for @homework,:url => {:controller => 'homework_common',:action => 'create'} do |f| %>
-          <%= hidden_field_tag "course",@course.id%>
-          <%= render :partial => 'homework_common/homework_detail_manual_form', :locals => { :homework => @homework,:f => f,:edit_mode => false } %>
-          <a href="javascript:void(0)" class="blue_btn fl mr10" onClick="submit_homework('new_homework_common');" >提交</a>
-          <%#= link_to "上一步", new_homework_common_path(:course => @course.id), :class => "orange_btn_homework fl"%>
-          <%= link_to '取消',homework_common_index_path(:course => @course.id),:class => 'grey_btn fl'%>
-      <% end%>
-    </div><!--hwork_new end-->
-<% elsif @homework_type == "2"%>
-    <div class="hwork_new">
-      <%= labelled_form_for @homework,:url => {:controller => 'homework_common',:action => 'create'} do |f| %>
-          <%= hidden_field_tag "course",@course.id%>
-          <%= hidden_field_tag "homework_common[homework_type]","2"%>
-          <%= render :partial => 'homework_common/homework_detail_programing_form', :locals => { :homework => @homework,:f => f,:edit_mode => false } %>
-          <a href="javascript:void(0)" class="blue_btn fl mr10" onClick="submit_homework('new_homework_common');" >提交</a>
-          <%#= link_to "上一步", new_homework_common_path(:course => @course.id), :class => "orange_btn_homework fl"%>
-          <%= link_to '取消',homework_common_index_path(:course => @course.id),:class => 'grey_btn fl'%>
-      <% end%>
-    </div><!--hwork_new end-->
-    <div class="cl"></div>
-<% end%>
\ No newline at end of file
diff --git a/app/views/issues/show.html.erb b/app/views/issues/show.html.erb
index 01cbea1c1..41605a826 100644
--- a/app/views/issues/show.html.erb
+++ b/app/views/issues/show.html.erb
@@ -1,4 +1,4 @@
-<%= javascript_include_tag "/assets/kindeditor/kindeditor",'/assets/kindeditor/pasteimg'  %>
+<%= javascript_include_tag "/assets/kindeditor/kindeditor", '/assets/kindeditor/pasteimg' %>
 <div class="project_r_h">
   <h2 class="project_h2"><%= l(:label_issue_edit) %></h2>
 </div>
@@ -22,25 +22,25 @@
       <div class="cl"></div>
       <p>由<a href="javascript:void(0)" class="problem_name"><%= @issue.author %></a>
         <%# if @issue.created_on != @issue.updated_on %>
-            添加于 <%= format_time(@issue.created_on).html_safe %>
+        添加于 <%= format_time(@issue.created_on).html_safe %>
         <%# else %>
-         <%#= format_time(@issue.updated_on).html_safe %>
+        <%#= format_time(@issue.updated_on).html_safe %>
         <%# end %>
     </div>
     <!--talk_txt end-->
     <a href="javascript:void(0)" class="talk_edit fr"<%= render :partial => 'action_menu' %></a>
     <div class="cl"></div>
-    <div class="talk_info mb10" style="word-break:break-all;">
+    <div class="talk_info mb10 list_style" style="word-break:break-all;">
       <% if @issue.description? || @issue.attachments.any? -%>
           <% if @issue.description? %>
               <%#= link_to l(:button_quote), quoted_issue_path(@issue.id), :remote => true, :method => 'post', :class => 'icon icon-comment' if authorize_for('issues', 'edit') %>
               <%= textAreailizable @issue, :description, :attachments => @issue.attachments %>
           <% end %>
-          </div>
-          <div class="pro_pic_box mb10">
-            <a href="javascript:void(0)" class="link_img fl">
-              <!--显示附件、图片-->
-              <%= link_to_attachment_project @issue, :thumbnails => true %></a><br/>
+    </div>
+    <div class="pro_pic_box mb10">
+      <a href="javascript:void(0)" class="link_img fl">
+        <!--显示附件、图片-->
+        <%= link_to_attachment_project @issue, :thumbnails => true %></a><br/>
       <% end -%>
       <%= call_hook(:view_issues_show_description_bottom, :issue => @issue) %>
       </div><!--pro_pic_box  end-->
@@ -48,51 +48,61 @@
       <!--属性-->
       <div class="pro_info_box mb10">
         <%= issue_fields_rows do |rows| %>
-              <ul class="fl" >
-                <li><p class="label03" >&nbsp;状态&nbsp;&nbsp;:&nbsp;</p><p class="pro_info_p"><%= @issue.status.name %></p>
-                </li>
-                <div class="cl"></div>
-              <% unless @issue.disabled_core_fields.include?('assigned_to_id') %>
-                <li><p class="label03" >&nbsp;指派给&nbsp;&nbsp;:&nbsp;</p><span class="pro_info_p"><%= @issue.assigned_to ? link_to_isuue_user(@issue.assigned_to) : "--" %></span>
-                </li>
-              <% end %>
-                <div class="cl"></div>
-              </ul>
-              <ul class="fl" >
-                <li><p class="label03" >&nbsp;优先级&nbsp;&nbsp;:&nbsp;</p><span class="pro_info_p" style="width:50px;"><%= @issue.priority.name %></span>
-                </li>
-                <div class="cl"></div>
-              <% unless @issue.disabled_core_fields.include?('done_ratio') %>
-                <li><p class="label03" >&nbsp;% 完成&nbsp;&nbsp;:&nbsp;</p><span class="pro_info_p" style="width:50px;"><%= @issue.done_ratio %>%</span>
-                </li>
-              <% end %>
-                <div class="cl"></div>
-              </ul>
+            <ul class="fl">
+              <li><p class="label03">&nbsp;状态&nbsp;&nbsp;:&nbsp;</p>
 
-              <ul class="fl " >
+                <p class="pro_info_p"><%= @issue.status.name %></p>
+              </li>
+              <div class="cl"></div>
+              <% unless @issue.disabled_core_fields.include?('assigned_to_id') %>
+                  <li><p class="label03">&nbsp;指派给&nbsp;&nbsp;:&nbsp;</p>
+                    <span class="pro_info_p"><%= @issue.assigned_to ? link_to_isuue_user(@issue.assigned_to) : "--" %></span>
+                  </li>
+              <% end %>
+              <div class="cl"></div>
+            </ul>
+            <ul class="fl">
+              <li><p class="label03">&nbsp;优先级&nbsp;&nbsp;:&nbsp;</p>
+                <span class="pro_info_p" style="width:50px;"><%= @issue.priority.name %></span>
+              </li>
+              <div class="cl"></div>
+              <% unless @issue.disabled_core_fields.include?('done_ratio') %>
+                  <li><p class="label03">&nbsp;% 完成&nbsp;&nbsp;:&nbsp;</p>
+                    <span class="pro_info_p" style="width:50px;"><%= @issue.done_ratio %>%</span>
+                  </li>
+              <% end %>
+              <div class="cl"></div>
+            </ul>
+
+            <ul class="fl ">
               <% unless @issue.disabled_core_fields.include?('start_date') %>
-                <li><p class="label03" style="width:50px;" >&nbsp;开始&nbsp;&nbsp;:&nbsp;</p><p class="pro_info_p"><%= format_date(@issue.start_date) %></p>
-                </li>
+                  <li><p class="label03" style="width:50px;">&nbsp;开始&nbsp;&nbsp;:&nbsp;</p>
+
+                    <p class="pro_info_p"><%= format_date(@issue.start_date) %></p>
+                  </li>
               <% end %>
-                <div class="cl"></div>
+              <div class="cl"></div>
               <% unless @issue.disabled_core_fields.include?('estimated_hours') %>
-                <li><p class="label03" style="width:50px;">&nbsp;周期&nbsp;&nbsp;:&nbsp;</p><span class="pro_info_p"><%= l_hours(@issue.estimated_hours) %></span>
-                </li>
+                  <li><p class="label03" style="width:50px;">&nbsp;周期&nbsp;&nbsp;:&nbsp;</p>
+                    <span class="pro_info_p"><%= l_hours(@issue.estimated_hours) %></span>
+                  </li>
               <% end %>
-                <div class="cl"></div>
-              </ul>
-              <ul class="fl " >
-                <% unless @issue.disabled_core_fields.include?('due_date') %>
-                <li><p class="label03" >&nbsp;计划完成&nbsp;&nbsp;:&nbsp;</p><span class="pro_info_p" style="width:120px;"><%= format_date(@issue.due_date)? format_date(@issue.due_date) : "--" %></span>
-                </li>
+              <div class="cl"></div>
+            </ul>
+            <ul class="fl ">
+              <% unless @issue.disabled_core_fields.include?('due_date') %>
+                  <li><p class="label03">&nbsp;计划完成&nbsp;&nbsp;:&nbsp;</p>
+                    <span class="pro_info_p" style="width:120px;"><%= format_date(@issue.due_date) ? format_date(@issue.due_date) : "--" %></span>
+                  </li>
               <% end %>
-                <div class="cl"></div>
+              <div class="cl"></div>
               <% unless @issue.disabled_core_fields.include?('fixed_version_id') %>
-                <li><p class="label03" >&nbsp;目标版本&nbsp;&nbsp;:&nbsp;</p><span class="pro_info_p" style="width:120px;"><%= (@issue.fixed_version ? link_to_version(@issue.fixed_version, :class => "pro_info_p") : "--") %></span>
-                </li>
+                  <li><p class="label03">&nbsp;目标版本&nbsp;&nbsp;:&nbsp;</p>
+                    <span class="pro_info_p" style="width:120px;"><%= (@issue.fixed_version ? link_to_version(@issue.fixed_version, :class => "pro_info_p") : "--") %></span>
+                  </li>
               <% end %>
-                <div class="cl"></div>
-              </ul>
+              <div class="cl"></div>
+            </ul>
             <% end %><!--pro_info_box end-->
         <%#= render_custom_fields_rows(@issue) %>
         <%#= call_hook(:view_issues_show_details_bottom, :issue => @issue) %>
@@ -111,7 +121,7 @@
       </div>
       <p style="padding-top: 5px"></p>
 
-<!--引用时不能修改，剥离出引用内容-->
+      <!--引用时不能修改，剥离出引用内容-->
 
       <a remote="true" href="javascript:void(0)" class="blue_btn fr mr80" onclick="issue_desc_editor.sync();$('#issue-form').submit();">
         <%= l(:button_submit) %>
diff --git a/app/views/news/_course_news_list.html.erb b/app/views/news/_course_news_list.html.erb
index da963b3cd..74a70e33d 100644
--- a/app/views/news/_course_news_list.html.erb
+++ b/app/views/news/_course_news_list.html.erb
@@ -7,7 +7,7 @@
     <% newss.each do |news| %>
         <div class="problem_main upload_img">
           <%= link_to image_tag(url_to_avatar(news.author),:width => 42,:height => 42), user_path(news.author), :class => "problem_pic fl" %>
-          <div class="problem_txt fl mt5">
+          <div class="problem_txt fl mt5 list_style">
             <%= link_to_user_header(news.author,false,{:class=> 'problem_name c_orange fl'}) if news.respond_to?(:author) %>
             <span class="fl">
                 <%= l(:label_release_news) %>：
diff --git a/app/views/news/_course_show.html.erb b/app/views/news/_course_show.html.erb
index 9ae951779..2d8dae59d 100644
--- a/app/views/news/_course_show.html.erb
+++ b/app/views/news/_course_show.html.erb
@@ -4,7 +4,7 @@
 </div>
 <div class="problem_main">
   <%= link_to image_tag(url_to_avatar(@news.author),:width => 42,:height => 42), user_path(@news.author), :class => "problem_pic fl" %>
-  <div class="problem_txt fl mt5">
+  <div class="problem_txt fl mt5 list_style">
     <h4 class="r_txt_tit mb5">
       <%=h @news.title %>
     </h4>
@@ -51,7 +51,7 @@
       <div class="ping_C mb10">
         <div><%= link_to image_tag(url_to_avatar(comment.author),:width => 42,:height => 42), user_path(comment.author), :class => "problem_pic fl"%></div>
         <div class="ping_discon">
-          <div class="ping_distop upload_img break_word">
+          <div class="ping_distop upload_img break_word list_style">
             <%= link_to_user_header(comment.author,false,:class => 'c_blue fb fl mb10 ') if comment.respond_to?(:author) %>
             <span class="c_grey fr">
                 <%= format_time(comment.created_on) %>
diff --git a/app/views/news/_project_news.html.erb b/app/views/news/_project_news.html.erb
index 0cd26382b..efbb74e46 100644
--- a/app/views/news/_project_news.html.erb
+++ b/app/views/news/_project_news.html.erb
@@ -31,7 +31,7 @@
       <% @newss.each do |news| %>
           <div class="problem_main">
             <%= link_to image_tag(url_to_avatar(news.author),:width => 42,:height => 42), user_path(news.author), :class => "problem_pic fl" %>
-            <div class="problem_txt fl mt5">
+            <div class="problem_txt fl mt5 list_style">
               <%= link_to_user_header(news.author,false,{:class=> 'problem_name c_orange fl'}) if news.respond_to?(:author) %>
               <span class="fl"> <%= l(:label_add_news) %>：</span><%= link_to h(news.title), news_path(news),:class => 'problem_tit fl fb c_dblue' %>
               <%=link_to "<span class = 'pic_mes'>#{news.comments.all.count}</span>".html_safe, news_path(news.id), :class => "pro_mes_w_news" %><br />
diff --git a/app/views/news/_project_show.html.erb b/app/views/news/_project_show.html.erb
index 6e94f0947..463b0f489 100644
--- a/app/views/news/_project_show.html.erb
+++ b/app/views/news/_project_show.html.erb
@@ -14,7 +14,7 @@
 
 <div class="problem_main">
       <%= link_to image_tag(url_to_avatar(@news.author),:width => 42,:height => 42), user_path(@news.author), :class => "problem_pic fl" %>
-      <div class="problem_txt fl mt5">
+      <div class="problem_txt fl mt5 list_style">
         <h4 class="r_txt_tit mb5">  <%=h @news.title %></h4>
         <%#= watcher_link(@news, User.current) %>
         <%= link_to(l(:button_edit),
diff --git a/app/views/poll/_edit_head.html.erb b/app/views/poll/_edit_head.html.erb
index 06e162f0d..8eebae5a2 100644
--- a/app/views/poll/_edit_head.html.erb
+++ b/app/views/poll/_edit_head.html.erb
@@ -22,3 +22,21 @@
       <div class="cl"></div>
     </div><!--编辑头部 end-->
 <% end%>
+<script type="text/javascript">
+  $(function(){
+      if($('#polls_description_div').html().trim() == '') {
+          $('#polls_description_div').html("<p style='color:#999999'>问卷描述</p>");
+      }
+  });
+
+  $('#polls_description_div').focus(function(){
+      //alert($('#polls_description_div').html().trim());
+      if(/^\s*<\w*\s*\w*\=\"\w*\:\s*\#\d*\"\>[\u4e00-\u9fa5]*<\/\w*\>\s*$/.test($('#polls_description_div').html().trim())) {
+          $('#polls_description_div').html('');
+      }
+  }).blur(function(){
+      if($('#polls_description_div').html().trim() == '') {
+          $('#polls_description_div').html("<p style='color:#999999'>问卷描述</p>");
+      }
+  });
+</script>
diff --git a/app/views/projects/show.html.erb b/app/views/projects/show.html.erb
index f1b3d9b7b..971794699 100644
--- a/app/views/projects/show.html.erb
+++ b/app/views/projects/show.html.erb
@@ -24,7 +24,7 @@
         <% if e.forge_act_type == "Issue" %>
             <div class="problem_main">
               <a  class="problem_pic fl"><%= image_tag(url_to_avatar(act.author), :width => "42", :height => "42") %></a>
-              <div class="problem_txt fl mt5 break_word">
+              <div class="problem_txt fl mt5 break_word list_style">
                 <a class="problem_name fl ">
                   <%= h(e.project) if @project.nil? || @project.id != e.project_id %>
                   <%= link_to act.author, user_path(act.author), :class => "problem_name c_orange fl" %><span class="fl"> <%= l(:label_new_activity) %> ：</span>
@@ -60,7 +60,7 @@
             <% elsif e.forge_act_type == "Message" %>
             <div class="problem_main">
               <a  class="problem_pic fl"><%= image_tag(url_to_avatar(e.user), :width => "42", :height => "42") %></a>
-              <div class="problem_txt fl mt5 break_word">
+              <div class="problem_txt fl mt5 break_word list_style">
                 <a class="problem_name fl ">
                   <%= h(e.project) if @project.nil? || @project.id != e.project_id %>
                   <%= link_to h(e.user), user_path(e.user_id), :class => "problem_name c_orange fl" %></a><span class="fl"> <%= l(:label_new_activity) %> ：</span>
@@ -79,7 +79,7 @@
         <% elsif e.forge_act_type == "News" %>
             <div class="problem_main">
               <a  class="problem_pic fl"><%= image_tag(url_to_avatar(e.user), :width => "42", :height => "42") %></a>
-              <div class="problem_txt fl mt5 break_word">
+              <div class="problem_txt fl mt5 break_word list_style">
                 <a class="problem_name fl ">
                   <%= h(e.project) if @project.nil? || @project.id != e.project_id %>
                   <%= link_to h(e.user), user_path(e.user_id), :class => "problem_name c_orange fl" %></a><span class="fl"> <%= l(:label_new_activity) %> ：</span>
diff --git a/app/views/student_work/_evaluation_title.html.erb b/app/views/student_work/_evaluation_title.html.erb
index bb1919472..cfd9632c2 100644
--- a/app/views/student_work/_evaluation_title.html.erb
+++ b/app/views/student_work/_evaluation_title.html.erb
@@ -1,8 +1,15 @@
-<ul class="hworkUl b_grey">
-  <li class="hworkList380 width625">
-    <span class="c_dark f14 fb fl ml10">作品信息</span>
+<ul class="hworkUl">
+  <li class="hworkList340 hworkH30 width505">
+    <span class="HomeworkNameTitle f14 fb fl">作品名称</span>
+    <span class="HomeworkStuTitle f14 fb fl">姓名</span>
+    <span class="HomeworkStuTitle f14 fb fl">学号</span>
   </li>
-  <li class="hworkList80 mr10" >
-    <span class="c_dark f14 fb fl ml10">我的评分</span>
+
+  <li class="hworkList130 hworkH30 fb ml10">
+    时间
+  </li>
+
+  <li class="hworkList50 hworkH30 fb mr10 ml10">
+    我的评分
   </li>
 </ul>
\ No newline at end of file
diff --git a/app/views/student_work/_evaluation_un_title.html.erb b/app/views/student_work/_evaluation_un_title.html.erb
index 8ca855e9b..9a21e109b 100644
--- a/app/views/student_work/_evaluation_un_title.html.erb
+++ b/app/views/student_work/_evaluation_un_title.html.erb
@@ -1,37 +1,51 @@
-<ul class="hworkUl b_grey">
-  <li class="hworkList380 <%= @homework.homework_type == 2 ? '' : 'width455'%>">
-    <span class="c_dark f14 fb fl ml10">作品信息</span>
+<ul class="hworkUl">
+  <li class="hworkList340 hworkH30 <%= @homework.homework_type == 2 ? '' : 'width385'%>">
+    <span class="c_dark f14 fb fl <%= @homework.homework_type == 2 ? 'mr60 ml80' : 'mr95 ml100'%>">作品名称</span>
+    <span class="c_dark f14 fb fl mr50">姓名</span>
+    <span class="c_dark f14 fb fl">学号</span>
   </li>
-  <li class="hworkList80" >
-    <%= link_to "教师评分",@show_all ? student_work_index_path(:homework => @homework.id,:order => "teacher_score", :sort => @score, :name => @name, :group => @group) : "javascript:void(0)",:class => "c_dark f14 fb fl ml10"%>
+
+  <li class="hworkList130 hworkH30">
+    <%= link_to "时间",@show_all ? student_work_index_path(:homework => @homework.id,:order => "created_at", :sort => @score, :name => @name, :group => @group) : "javascript:void(0)",:class => "c_dark f14 fb fl ml50" ,:remote => true%>
+    <% if @show_all && @order == "created_at"%>
+        <%= link_to "", student_work_index_path(:homework => @homework.id,:order => "created_at", :sort => @score, :name => @name, :group => @group) ,:class => "#{@score == 'desc' ? 'st_up' : 'st_down'} mt10",:remote => true%>
+    <% end%>
+  </li>
+
+  <li class="hworkList50 hworkH30" >
+    <%= link_to "教师",@show_all ? student_work_index_path(:homework => @homework.id,:order => "teacher_score", :sort => @score, :name => @name, :group => @group) : "javascript:void(0)",:class => "c_dark f14 fb fl ml10" ,:remote => true%>
     <% if @show_all && @order == "teacher_score"%>
-        <%= link_to "", student_work_index_path(:homework => @homework.id,:order => "teacher_score", :sort => @score, :name => @name, :group => @group) ,:class => "#{@score == 'desc' ? 'st_up' : 'st_down'} mt19"%>
+        <%= link_to "", student_work_index_path(:homework => @homework.id,:order => "teacher_score", :sort => @score, :name => @name, :group => @group) ,:class => "#{@score == 'desc' ? 'st_up' : 'st_down'} mt10" ,:remote => true%>
     <% end%>
   </li>
-  <li class="hworkList80">
-    <%= link_to "教辅评分",@show_all ? student_work_index_path(:homework => @homework.id,:order => "teaching_asistant_score", :sort => @score, :name => @name, :group => @group) : "javascript:void(0)",:class => "c_dark f14 fb fl ml10"%>
+
+  <li class="hworkList50 hworkH30">
+    <%= link_to "教辅",@show_all ? student_work_index_path(:homework => @homework.id,:order => "teaching_asistant_score", :sort => @score, :name => @name, :group => @group) : "javascript:void(0)",:class => "c_dark f14 fb fl ml10",:remote => true%>
     <% if @show_all && @order == "teaching_asistant_score"%>
-        <%= link_to "", student_work_index_path(:homework => @homework.id,:order => "teaching_asistant_score", :sort => @score, :name => @name, :group => @group) ,:class => "#{@score == 'desc' ? 'st_up' : 'st_down'} mt19"%>
+        <%= link_to "", student_work_index_path(:homework => @homework.id,:order => "teaching_asistant_score", :sort => @score, :name => @name, :group => @group) ,:class => "#{@score == 'desc' ? 'st_up' : 'st_down'} mt10",:remote => true%>
     <% end%>
   </li>
+
   <% if @homework.homework_type == 2%>
-      <li class="hworkList80">
-        <%= link_to "系统评分",@show_all ? student_work_index_path(:homework => @homework.id,:order => "system_score", :sort => @score, :name => @name, :group => @group) : "javascript:void(0)",:class => "c_dark f14 fb fl ml10"%>
+      <li class="hworkList50 hworkH30">
+        <%= link_to "系统",@show_all ? student_work_index_path(:homework => @homework.id,:order => "system_score", :sort => @score, :name => @name, :group => @group) : "javascript:void(0)",:class => "c_dark f14 fb fl ml10",:remote => true%>
         <% if @show_all && @order == "system_score"%>
-            <%= link_to "", student_work_index_path(:homework => @homework.id,:order => "system_score", :sort => @score, :name => @name, :group => @group) ,:class => "#{@score == 'desc' ? 'st_up' : 'st_down'} mt19"%>
+            <%= link_to "", student_work_index_path(:homework => @homework.id,:order => "system_score", :sort => @score, :name => @name, :group => @group) ,:class => "#{@score == 'desc' ? 'st_up' : 'st_down'} mt10",:remote => true%>
         <% end%>
       </li>
   <% end%>
-  <li class="hworkList50">
-    <%= link_to "匿评",@show_all ? student_work_index_path(:homework => @homework.id,:order => "student_score", :sort => @score, :name => @name, :group => @group) : "javascript:void(0)",:class => "c_dark f14 fb fl ml10"%>
+
+  <li class="hworkList50 hworkH30">
+    <%= link_to "匿评",@show_all ? student_work_index_path(:homework => @homework.id,:order => "student_score", :sort => @score, :name => @name, :group => @group) : "javascript:void(0)",:class => "c_dark f14 fb fl ml10",:remote => true%>
     <% if @show_all && @order == "student_score"%>
-        <%= link_to "", student_work_index_path(:homework => @homework.id,:order => "student_score", :sort => @score, :name => @name, :group => @group) ,:class => "#{@score == 'desc' ? 'st_up' : 'st_down'} mt19"%>
+        <%= link_to "", student_work_index_path(:homework => @homework.id,:order => "student_score", :sort => @score, :name => @name, :group => @group) ,:class => "#{@score == 'desc' ? 'st_up' : 'st_down'} mt10",:remote => true%>
     <% end%>
   </li>
-  <li class="hworkList50">
-    <%= link_to "成绩",@show_all ? student_work_index_path(:homework => @homework.id,:order => "score", :sort => @score, :name => @name, :group => @group) : "javascript:void(0)",:class => "c_dark f14 fb fl ml10"%>
+
+  <li class="hworkList50 hworkH30">
+    <%= link_to "成绩",@show_all ? student_work_index_path(:homework => @homework.id,:order => "score", :sort => @score, :name => @name, :group => @group) : "javascript:void(0)",:class => "c_dark f14 fb fl ml10",:remote => true%>
     <% if @show_all && @order == "score"%>
-        <%= link_to "", student_work_index_path(:homework => @homework.id,:order => "score", :sort => @score, :name => @name, :group => @group) ,:class => "#{@score == 'desc' ? 'st_up' : 'st_down'} mt19"%>
+        <%= link_to "", student_work_index_path(:homework => @homework.id,:order => "score", :sort => @score, :name => @name, :group => @group) ,:class => "#{@score == 'desc' ? 'st_up' : 'st_down'} mt10",:remote => true%>
     <% end%>
   </li>
 </ul>
\ No newline at end of file
diff --git a/app/views/student_work/_evaluation_un_work.html.erb b/app/views/student_work/_evaluation_un_work.html.erb
index d3bac240d..bc9fe2e00 100644
--- a/app/views/student_work/_evaluation_un_work.html.erb
+++ b/app/views/student_work/_evaluation_un_work.html.erb
@@ -1,46 +1,48 @@
 <!-- 匿评作品列表，显示某一个作品的信息 -->
 <ul class="hworkListRow" id="student_work_<%= student_work.id%>">
-  <li class="hworkList380 <%= @homework.homework_type == 2 ? '' : 'width455'%>">
+  <li class="hworkList340 <%= @homework.homework_type == 2 ? '' : 'width385'%>">
     <ul>
-      <li class="hworkName mt12">
-        <% student_work_name = student_work.name.nil? || student_work.name.empty? ? student_work.user.show_name + '的作品' : student_work.name%>
-        <%= link_to student_work_name, student_work_path(student_work),:remote => true,:title => student_work_name, :class => "linkGrey f14"%>
+      <li class="hworkPortrait mt15 mr10">
+        <%= image_tag(url_to_avatar(student_work.user),width:"40", height: "40") %>
+      </li>
+      <li class="hworkName mt15 mr15 <%= @homework.homework_type == 2 ? '' : 'width165'%>">
+        <% student_work_name = student_work.name.nil? || student_work.name.empty? ? student_work.user.show_name + '的作品' : student_work.name%>
+        <div>
+          <%= link_to student_work_name, student_work_path(student_work),:remote => true,:title => student_work_name, :class => "linkGrey f14 StudentName break_word #{@homework.homework_type == 2 ? '' : 'width165'}"%>
+        </div>
       </li>
-      <div class="cl"></div>
       <li>
-        <ul class="mt12">
-          <li class="hworkDetail mr15">
-            姓名：<%= student_work.user.show_name%>
+        <ul class="mt10 fl">
+          <li class="hworkStName mr10 mt16" title="姓名">
+            <%= student_work.user.show_name%>
           </li>
-          <li class="hworkDetail mr15">
-            学号：
+          <li class="hworkStID mt16" title="学号">
             <%= student_work.user.user_extensions.nil? ? "--" : student_work.user.user_extensions.student_id%>
           </li>
-          <li class="hworkDate">
-            时间：
-            <% if Time.parse(@homework.end_time.to_s).strftime("%Y-%m-%d") < Time.parse(student_work.created_at.to_s).strftime("%Y-%m-%d") %>
-                <span class="c_red">迟交</span>
-            <% else%>
-                <%= format_time student_work.created_at%>
-            <% end %>
-          </li>
         </ul>
       </li>
     </ul>
   </li>
-  <li class="hworkList80 <%= score_color student_work.teacher_score%>">
+  <li class="hworkList130 c_grey">
+    <%= Time.parse(format_time(student_work.created_at)).strftime("%m-%d %H:%M")%>&nbsp;
+    <% if Time.parse(@homework.end_time.to_s).strftime("%Y-%m-%d") < Time.parse(student_work.created_at.to_s).strftime("%Y-%m-%d") %>
+        <span class="c_red">[迟交]</span>
+    <% end %>
+  </li>
+  <li class="hworkList50 <%= score_color student_work.teacher_score%>">
     <%= student_work.teacher_score.nil? ? "--" : format("%.1f",student_work.teacher_score)%>
   </li>
-  <li class="hworkList80 <%= score_color student_work.teaching_asistant_score%>">
+  <li class="hworkList50 <%= score_color student_work.teaching_asistant_score%>">
     <%= student_work.teaching_asistant_score.nil? ? "--" : format("%.1f",student_work.teaching_asistant_score)%>
   </li>
 
   <% if @homework.homework_type == 2%>
       <!-- 系统评分 -->
-      <li class="hworkList80 <%= score_color student_work.system_score%>">
+      <li class="hworkList50 <%= score_color student_work.system_score%>">
         <%= student_work.system_score.nil? ? "--" : format("%.1f",student_work.system_score)%>
       </li>
   <% end%>
+
   <li class="hworkList50 <%= score_color student_work.student_score%> student_score_info">
     <%= student_work.student_score.nil? ? "--" : format("%.1f",student_work.student_score)%>
     <% unless student_work.student_score.nil?%>
@@ -73,4 +75,5 @@
         </div>
     <% end%>
   </li>
-</ul>
\ No newline at end of file
+</ul>
+
diff --git a/app/views/student_work/_evaluation_work.html.erb b/app/views/student_work/_evaluation_work.html.erb
index f8b9addbd..63cb7ea99 100644
--- a/app/views/student_work/_evaluation_work.html.erb
+++ b/app/views/student_work/_evaluation_work.html.erb
@@ -1,51 +1,62 @@
 <!-- 匿评作品列表，显示某一个作品的信息 -->
 <ul class="hworkListRow" id="student_work_<%= student_work.id%>">
   <% is_my_work = student_work.user == User.current%>
-  <li class="hworkList380 width620">
+  <li class="hworkList340 width525">
     <ul>
-      <li class="hworkName mt12 m_width620">
-        <% if is_my_work%>
+      <% if is_my_work%>
+          <li class="hworkPortrait mt15 mr10">
+            <%= image_tag(url_to_avatar(student_work.user),width:"40", height: "40") %>
+          </li>
+          <li class="hworkName mt15 mr15 width285">
             <% student_work_name = student_work.name.nil? || student_work.name.empty? ? student_work.user.show_name + '的作品' : student_work.name%>
-            <%= link_to student_work_name, student_work_path(student_work),:remote => true,:title => student_work_name, :class => "linkGrey f14"%>
-        <% else%>
-            <%= link_to "匿名的作品", student_work_path(student_work),:remote => true,:title => student_work_name, :class => "linkGrey f14"%>
-        <% end%>
-      </li>
-      <div class="cl"></div>
-      <li>
-        <ul class="mt12">
-          <li class="hworkDetail mr15">
-            姓名：
-            <% if is_my_work%>
+            <div>
+              <%= link_to student_work_name, student_work_path(student_work),:remote => true,:title => student_work_name, :class => "linkGrey f14 StudentName break_word width285"%>
+            </div>
+          </li>
+          <li>
+            <ul class="mt10 fl">
+              <li class="hworkStName mr10 mt16" title="姓名">
                 <%= student_work.user.show_name%>
-            <% else%>
-                匿名
-            <% end%>
-          </li>
-          <li class="hworkDetail mr15">
-            学号：
-            <% if is_my_work%>
-              <span>
+              </li>
+              <li class="hworkStID mt16" title="学号">
                 <%= student_work.user.user_extensions.nil? ? "--" : student_work.user.user_extensions.student_id%>
-              </span>
-            <% else%>
-              --
-            <% end%>
+              </li>
+            </ul>
           </li>
-          <li class="hworkDate">
-            时间：
-            <% if Time.parse(@homework.end_time.to_s).strftime("%Y-%m-%d") < Time.parse(student_work.created_at.to_s).strftime("%Y-%m-%d") %>
-                <span class="c_red">迟交</span>
-            <% else%>
-                <%= format_time student_work.created_at%>
-            <% end %>
+      <% else%>
+          <li class="hworkPortrait mt15 mr10">
+            <%= image_tag(url_to_avatar(""),width:"40", height: "40") %>
           </li>
-        </ul>
-      </li>
+          <li class="hworkName mt15 mr15 width285">
+            <div>
+              <%= link_to "匿名的作品", student_work_path(student_work),:remote => true,:title => student_work_name, :class => "linkGrey f14 StudentName break_word width285"%>
+            </div>
+          </li>
+          <li>
+            <ul class="mt10 fl">
+              <li class="hworkStName mr10 mt16" title="姓名">
+                匿名
+              </li>
+              <li class="hworkStID mt16" title="学号">
+                --
+              </li>
+            </ul>
+          </li>
+      <% end%>
+
     </ul>
   </li>
+  <li class="hworkList130 c_grey">
+    <%= Time.parse(format_time(student_work.created_at)).strftime("%m-%d %H:%M")%>&nbsp;
+    <% if Time.parse(@homework.end_time.to_s).strftime("%Y-%m-%d") < Time.parse(student_work.created_at.to_s).strftime("%Y-%m-%d") %>
+        <span class="c_red">[迟交]</span>
+    <% end %>
+  </li>
+
+  <!-- 成绩 -->
   <% my_score = student_work_score(student_work,User.current) %>
-  <li class="hworkList80 <%= my_score.nil? ? 'c_grey' : score_color(my_score.score)%> mr10">
+  <li class="hworkList50 <%= my_score.nil? ? 'c_grey' : score_color(my_score.score)%> mr10">
     <%= my_score.nil? ? "--" : format("%.1f",my_score.score)%>
   </li>
-</ul>
\ No newline at end of file
+</ul>
+
diff --git a/app/views/student_work/_student_work_list.html.erb b/app/views/student_work/_student_work_list.html.erb
new file mode 100644
index 000000000..197fecac9
--- /dev/null
+++ b/app/views/student_work/_student_work_list.html.erb
@@ -0,0 +1,36 @@
+<div class="fl" style="border-bottom:1px solid #eaeaea; padding-bottom:10px; width:720px;">
+  <span class="c_dark f14 fb fl mr30">
+      作品
+      <font class="f12 c_red">
+        （<%= @stundet_works.count%>）
+      </font>
+  </span>
+  <%if @is_teacher || @homework.homework_detail_manual.comment_status == 3%>
+      <div class="hworkSearchBox">
+        <input type="text" id="course_student_name" value="<%= @name%>" placeholder="姓名、学号、邮箱" class="hworkSearchInput" onkeypress="SearchByName('<%= student_work_index_path(:homework => @homework.id)%>',event);"/>
+        <a class="hworkSearchIcon" id="search_in_student_work" onclick="SearchByName_1('<%= student_work_index_path(:homework => @homework.id)%>');" href="javascript:void(0)"></a>
+      </div>
+      <%= select_tag(:student_work_in_group,options_for_select(course_group_list(@course),@group), {:class => "classSplit"}) unless course_group_list(@course).empty?  %>
+  <% end%>
+</div>
+<div class="cl"></div>
+
+<div class="fl">
+  <% if @is_evaluation && !@stundet_works.empty?%>
+      <%= render :partial => "evaluation_title"%>
+  <% else%>
+      <%= render :partial => "evaluation_un_title"%>
+  <% end%>
+</div>
+<div class="cl"></div>
+
+<% @stundet_works.each do |student_work|%>
+    <% if @is_evaluation%>
+        <%= render :partial => "evaluation_work", :locals => {:student_work => student_work}%>
+    <% else%>
+        <%= render :partial => "evaluation_un_work", :locals => {:student_work => student_work}%>
+    <% end%>
+    <div class="cl"></div>
+    <div id="about_hwork_<%= student_work.id%>"></div>
+    <div class="cl"></div>
+<% end%>
\ No newline at end of file
diff --git a/app/views/student_work/index.html.erb b/app/views/student_work/index.html.erb
index 5398b7084..9c48d310b 100644
--- a/app/views/student_work/index.html.erb
+++ b/app/views/student_work/index.html.erb
@@ -56,7 +56,7 @@
                 <a href="javascript:void(0);" class="resourcesIcon"></a>
                 <ul class="hworkMenu">
                   <li>
-                    <%= link_to "导出作业成绩", student_work_index_path(:homework => @homework.id,:order => @order, :sort => @b_sort, :name => @name, :format => 'xls'),:class=>'hworkExport postTypeGrey'%>
+                    <%= link_to "导出作业成绩", student_work_index_path(:homework => @homework.id,:order => @order, :sort => @b_sort, :name => @name, :group => @group, :format => 'xls'),:class=>'hworkExport postTypeGrey', :id => "export_student_work"%>
                   </li>
                   <li>
                     <% if @homework.student_works.empty?%>
@@ -82,45 +82,15 @@
       <% end%>
       <div class="cl"></div>
     </div>
+
     <div class="hworkListContainer">
       <div class="ctt2">
-        <div class="dis" id="tbc_01">
-          <div class="codeList">
-            <span class="fl mt3">
-              <%= link_to "所有作品<font class='f12 c_red'>[共#{@stundet_works.count}份]</font>".html_safe,student_work_index_path(:homework => @homework.id),:class => "fl f14"%>
-            </span>
-            <%if @is_teacher || @homework.homework_detail_manual.comment_status == 3%>
-                <div class="resourcesSearchloadBox fr">
-                  <input type="text" id="course_student_name" value="<%= @name%>" placeholder="姓名、学号、邮箱" class="searchResource" onkeypress="SearchByName('<%= student_work_index_path(:homework => @homework.id)%>',event);"/>
-                  <a class="homepageSearchIcon" onclick="SearchByName_1('<%= student_work_index_path(:homework => @homework.id)%>');" href="javascript:void(0)"></a>
-                </div>
-            <% end%>
-            <div class="cl"></div>
-          </div>
-          <!---code_list end--->
-          <div class="fl">
-            <% if @is_evaluation && !@stundet_works.empty?%>
-                <%= render :partial => "evaluation_title"%>
-            <% else%>
-                <%= render :partial => "evaluation_un_title"%>
-            <% end%>
-          </div>
-          <!---hwork_ul end--->
-          <div class="cl"></div>
-          <% @stundet_works.each do |student_work|%>
-              <% if @is_evaluation%>
-                  <%= render :partial => "evaluation_work", :locals => {:student_work => student_work}%>
-              <% else%>
-                  <%= render :partial => "evaluation_un_work", :locals => {:student_work => student_work}%>
-              <% end%>
-              <div class="cl"></div>
-              <!---hwork_ul end--->
-              <div id="about_hwork_<%= student_work.id%>"></div>
-              <div class="cl"></div>
-          <% end%>
+        <div class="dis" id="homework_student_work_list">
+          <%= render :partial => "student_work/student_work_list"%>
         </div>
       </div>
     </div>
+
     <div class="cl"></div>
   </div>
 </div>
diff --git a/app/views/student_work/index.js.erb b/app/views/student_work/index.js.erb
new file mode 100644
index 000000000..73b94260d
--- /dev/null
+++ b/app/views/student_work/index.js.erb
@@ -0,0 +1,2 @@
+$("#homework_student_work_list").html("<%= escape_javascript(render :partial => 'student_work/student_work_list') %>");
+$("#export_student_work").replaceWith("<%= escape_javascript( link_to "导出作业成绩", student_work_index_path(:homework => @homework.id,:order => @order, :sort => @b_sort, :group => @group, :name => @name, :format => 'xls'),:class=>'hworkExport postTypeGrey', :id => 'export_student_work') %>");
\ No newline at end of file
diff --git a/app/views/student_work/new.html.erb b/app/views/student_work/new.html.erb
index f9b242443..c7f1d45c4 100644
--- a/app/views/student_work/new.html.erb
+++ b/app/views/student_work/new.html.erb
@@ -7,7 +7,7 @@
         $('#ajax-modal').siblings().remove();
         $('#ajax-modal').before("<span style='float: right;cursor:pointer;'>" +
         "<a href='javascript:' onclick='clickCanel();'><img src='/images/bid/close.png' width='26px' height='26px' /></a></span>");
-        $('#ajax-modal').parent().css("top","30%").css("left","40%");
+        $('#ajax-modal').parent().css("top","65%").css("left","60%");
         $('#ajax-modal').parent().addClass("anonymos_work");
     });
   <% end%>
diff --git a/app/views/users/_course_homework.html.erb b/app/views/users/_course_homework.html.erb
index 366473b52..afd2f142b 100644
--- a/app/views/users/_course_homework.html.erb
+++ b/app/views/users/_course_homework.html.erb
@@ -42,7 +42,7 @@
 
         <div class="homepagePostDeadline">截止时间：<%= activity.end_time.to_s %></div>
       </div>
-      <div class="homepagePostIntro break_word upload_img" id="activity_description_<%= user_activity_id%>">
+      <div class="homepagePostIntro break_word upload_img list_style" id="activity_description_<%= user_activity_id%>">
         <%= activity.description.html_safe %>
       </div>
       <div class="homepagePostSetting" style="visibility: hidden"  id="act-<%=user_activity_id %>">
diff --git a/app/views/users/_course_message.html.erb b/app/views/users/_course_message.html.erb
index 703882bd1..fd9ae05e8 100644
--- a/app/views/users/_course_message.html.erb
+++ b/app/views/users/_course_message.html.erb
@@ -24,7 +24,7 @@
         发帖时间：<%= format_time(activity.created_on) %>
       </div>
 
-      <div class="homepagePostIntro break_word upload_img" id="activity_description_<%= user_activity_id%>">
+      <div class="homepagePostIntro break_word upload_img list_style" id="activity_description_<%= user_activity_id%>">
         <% if activity.parent_id.nil? %>
             <%= activity.content.to_s.html_safe%>
         <% else %>
@@ -45,15 +45,16 @@
     </div>
     <div class="cl"></div>
   </div>
+  <% count=0 %>
+  <% if activity.parent %>
+      <% count=activity.parent.children.count%>
+  <% else %>
+      <% count=activity.children.count%>
+  <% end %>
   <div class="homepagePostReply">
-    <div class="homepagePostReplyBanner">
-      <% count=0 %>
+    <div class="topBorder" style="display: <%= count>0 ? 'none': '' %>"></div>
+    <div class="homepagePostReplyBanner" style="display: <%= count>0 ? '': 'none' %>">
       <div class="homepagePostReplyBannerCount" onclick="expand_reply_input('#reply_input_<%= user_activity_id %>');">回复(
-        <% if activity.parent %>
-            <% count=activity.parent.children.count%>
-       <% else %>
-            <% count=activity.children.count%>
-        <% end %>
         <%= count %>
         )</div>
       <div class="homepagePostReplyBannerTime"><%#=format_date(activity.updated_on)%></div>
@@ -86,7 +87,7 @@
                       <% end %>
                       <%= format_time(reply.created_on) %>
                     </div>
-                    <div class="homepagePostReplyContent break_word">
+                    <div class="homepagePostReplyContent break_word list_style">
                       <%= reply.content.html_safe %>
                     </div>
                   </div>
@@ -99,14 +100,14 @@
 
     <div class="homepagePostReplyContainer borderBottomNone minHeight48">
       <div class="homepagePostReplyPortrait mr15 imageFuzzy" id="reply_image_<%= user_activity_id%>"><%= link_to image_tag(url_to_avatar(User.current), :width => "33", :height => "33"), user_path(activity.author_id), :alt => "用户头像" %></div>
-      <div class="homepagePostReplyInputContainer mt3 mb10">
+      <div class="homepagePostReplyInputContainer  mb10">
         <div nhname='new_message_<%= user_activity_id%>' style="display:none;">
           <%= form_for('new_form',:url =>  {:controller=>'messages',:action => 'reply', :id => activity.id, :board_id => activity.board_id, :is_board => 'true'},:method => "post", :remote => true) do |f|%>
               <input type="hidden" name="quote[quote]" value="">
               <input type="hidden" name="user_activity_id" value="<%=user_activity_id%>">
               <textarea placeholder="有问题或有建议，请直接给我留言吧！" style="display: none" nhname='new_message_textarea_<%= user_activity_id%>' name="reply[content]"></textarea>
               <div nhname='toolbar_container_<%= user_activity_id%>' style="float:left; margin-left: 5px; padding-top:3px;"></div>
-              <a id="new_message_submit_btn_<%= user_activity_id%>" href="javascript:void(0)" class="blue_n_btn fr" style="margin-top:6px;">发送</a>
+              <a id="new_message_submit_btn_<%= user_activity_id%>" href="javascript:void(0)" class="blue_n_btn fr" style="display:none;margin-top:6px;">发送</a>
               <div class="cl"></div>
               <p nhname='contentmsg_<%= user_activity_id%>'></p>
           <% end%>
diff --git a/app/views/users/_course_news.html.erb b/app/views/users/_course_news.html.erb
index ef01022ce..99e85fc73 100644
--- a/app/views/users/_course_news.html.erb
+++ b/app/views/users/_course_news.html.erb
@@ -18,15 +18,16 @@
       <div class="homepagePostDate">
         发布时间：<%= format_time(activity.created_on) %>
       </div>
-      <div class="homepagePostIntro break_word upload_img" id="activity_description_<%= user_activity_id %>">
+      <div class="homepagePostIntro break_word upload_img list_style" id="activity_description_<%= user_activity_id %>">
         <%= activity.description.html_safe %>
       </div>
     </div>
     <div class="cl"></div>
   </div>
+  <% count=activity.comments.count %>
   <div class="homepagePostReply">
-    <div class="homepagePostReplyBanner">
-      <% count=activity.comments.count %>
+    <div class="topBorder" style="display: <%= count>0 ? 'none': '' %>"></div>
+    <div class="homepagePostReplyBanner" style="display: <%= count>0 ? '': 'none' %>">
       <div class="homepagePostReplyBannerCount" onclick="expand_reply_input('#reply_input_<%= user_activity_id %>');">
         回复（<%= count %>）
       </div>
@@ -59,7 +60,7 @@
                       <% end %>
                       <%= format_time(comment.created_on) %>
                     </div>
-                    <div class="homepagePostReplyContent break_word"><%= comment.comments.html_safe %></div>
+                    <div class="homepagePostReplyContent break_word list_style"><%= comment.comments.html_safe %></div>
                   </div>
                   <div class="cl"></div>
                 </li>
@@ -70,13 +71,13 @@
 
     <div class="homepagePostReplyContainer borderBottomNone minHeight48">
       <div class="homepagePostReplyPortrait mr15 imageFuzzy" id="reply_image_<%= user_activity_id%>"><%= link_to image_tag(url_to_avatar(User.current), :width => "33", :height => "33"), user_path(activity.author_id), :alt => "用户头像" %></div>
-      <div class="homepagePostReplyInputContainer mt3 mb10">
+      <div class="homepagePostReplyInputContainer mb10">
         <div nhname='new_message_<%= user_activity_id%>' style="display:none;">
           <%= form_for('new_form',:url =>  {:controller => 'comments', :action => 'create', :id => activity},:method => "post", :remote => true) do |f|%>
               <input type="hidden" name="user_activity_id" value="<%=user_activity_id%>">
               <textarea placeholder="有问题或有建议，请直接给我留言吧！" style="display: none" nhname='new_message_textarea_<%= user_activity_id%>' name="comment"></textarea>
               <div nhname='toolbar_container_<%= user_activity_id%>' style="float:left;padding-top:3px; margin-left: 5px;"></div>
-              <a id="new_message_submit_btn_<%= user_activity_id%>" href="javascript:void(0)" class="blue_n_btn fr" style="margin-top:6px;">发送</a>
+              <a id="new_message_submit_btn_<%= user_activity_id%>" href="javascript:void(0)" class="blue_n_btn fr" style="display:none;margin-top:6px;">发送</a>
               <div class="cl"></div>
               <p nhname='contentmsg_<%= user_activity_id%>'></p>
           <% end%>
diff --git a/app/views/users/_project_issue.html.erb b/app/views/users/_project_issue.html.erb
index 29bed1499..0b86dc3eb 100644
--- a/app/views/users/_project_issue.html.erb
+++ b/app/views/users/_project_issue.html.erb
@@ -33,7 +33,7 @@
           <%=format_time(activity.created_on) %>
         </div>
       </div>
-      <div class="homepagePostIntro break_word upload_img" id="activity_description_<%= user_activity_id %>">
+      <div class="homepagePostIntro break_word upload_img list_style" id="activity_description_<%= user_activity_id %>">
         <% if activity.description? %>
             <%= textAreailizable activity, :description, :attachments => activity.attachments %>
         <% end %>
@@ -63,10 +63,10 @@
     </div>
     <div class="cl"></div>
   </div>
+  <% count = activity.journals.count %>
   <div class="homepagePostReply">
-
-    <div class="homepagePostReplyBanner">
-      <% count = activity.journals.count %>
+    <div class="topBorder" style="display: <%= count>0 ? 'none': '' %>"></div>
+    <div class="homepagePostReplyBanner" style="display: <%= count>0 ? '': 'none' %>">
       <div class="homepagePostReplyBannerCount" onclick="expand_reply_input('#reply_input_<%= user_activity_id %>');">回复（<%= count %>）</div>
       <div class="homepagePostReplyBannerTime"><%#= format_date(activity.updated_on) %></div>
       <% if count > 2 %>
@@ -115,13 +115,13 @@
 
     <div class="homepagePostReplyContainer borderBottomNone minHeight48">
       <div class="homepagePostReplyPortrait mr15 imageFuzzy" id="reply_image_<%= user_activity_id%>"><%= link_to image_tag(url_to_avatar(User.current), :width => "33", :height => "33"), user_path(activity.author_id), :alt => "用户头像" %></div>
-      <div class="homepagePostReplyInputContainer mt3 mb10">
+      <div class="homepagePostReplyInputContainer mb10">
         <div nhname='new_message_<%= user_activity_id%>' style="display:none;">
           <%= form_for('new_form',:url =>  add_journal_issue_path(activity.id),:method => "post", :remote => true) do |f|%>
               <input type="hidden" name="user_activity_id" value="<%=user_activity_id%>">
               <textarea placeholder="有问题或有建议，请直接给我留言吧！" style="display: none" nhname='new_message_textarea_<%= user_activity_id%>' name="notes"></textarea>
               <div nhname='toolbar_container_<%= user_activity_id%>' style="float:left;padding-top:3px; margin-left: 5px;"></div>
-              <a id="new_message_submit_btn_<%= user_activity_id%>" href="javascript:void(0)" class="blue_n_btn fr" style="margin-top:6px;">发送</a>
+              <a id="new_message_submit_btn_<%= user_activity_id%>" href="javascript:void(0)" class="blue_n_btn fr" style="display:none;margin-top:6px;">发送</a>
               <div class="cl"></div>
               <p nhname='contentmsg_<%= user_activity_id%>'></p>
           <% end%>
diff --git a/app/views/users/_project_message.html.erb b/app/views/users/_project_message.html.erb
index 2cce8f83a..2856d6ed1 100644
--- a/app/views/users/_project_message.html.erb
+++ b/app/views/users/_project_message.html.erb
@@ -26,7 +26,7 @@
       <div class="homepagePostDate">
         时间：<%= format_time(activity.created_on) %>
       </div>
-      <div class="homepagePostIntro break_word upload_img" id="activity_description_<%= user_activity_id%>">
+      <div class="homepagePostIntro break_word upload_img list_style" id="activity_description_<%= user_activity_id%>">
         <% if activity.parent_id.nil? %>
             <%= activity.content.to_s.html_safe%>
         <% else %>
@@ -36,15 +36,16 @@
     </div>
     <div class="cl"></div>
   </div>
+  <% count = 0 %>
+  <% if activity.parent %>
+      <% count=activity.parent.children.count%>
+  <% else %>
+      <% count=activity.children.count%>
+  <% end %>
   <div class="homepagePostReply">
-    <div class="homepagePostReplyBanner">
-      <% count = 0 %>
+    <div class="topBorder" style="display: <%= count>0 ? 'none': '' %>"></div>
+    <div class="homepagePostReplyBanner" style="display: <%= count>0 ? '': 'none' %>">
       <div class="homepagePostReplyBannerCount" onclick="expand_reply_input('#reply_input_<%= user_activity_id %>');">回复(
-        <% if activity.parent %>
-            <% count=activity.parent.children.count%>
-        <% else %>
-            <% count=activity.children.count%>
-        <% end %>
         <%=count %>
         )</div>
       <div class="homepagePostReplyBannerTime"><%#=format_date(activity.updated_on)%></div>
@@ -73,7 +74,7 @@
                       <% end %>
                       <%= format_time(reply.created_on) %>
                     </div>
-                    <div class="homepagePostReplyContent break_word"><%= reply.content.html_safe %></div>
+                    <div class="homepagePostReplyContent break_word list_style"><%= reply.content.html_safe %></div>
                   </div>
                   <div class="cl"></div>
                 </li>
@@ -84,14 +85,14 @@
 
     <div class="homepagePostReplyContainer borderBottomNone minHeight48">
       <div class="homepagePostReplyPortrait mr15 imageFuzzy" id="reply_image_<%= user_activity_id%>"><%= link_to image_tag(url_to_avatar(User.current), :width => "33", :height => "33"), user_path(activity.author_id), :alt => "用户头像" %></div>
-      <div class="homepagePostReplyInputContainer mt3 mb10">
+      <div class="homepagePostReplyInputContainer mb10">
         <div nhname='new_message_<%= user_activity_id%>' style="display:none;">
           <%= form_for('new_form',:url =>  {:controller=>'messages',:action => 'reply', :id => activity.id, :board_id => activity.board_id, :is_board => 'true'},:method => "post", :remote => true) do |f|%>
               <input type="hidden" name="quote[quote]" value="">
               <input type="hidden" name="user_activity_id" value="<%=user_activity_id%>">
               <textarea placeholder="有问题或有建议，请直接给我留言吧！" style="display: none" nhname='new_message_textarea_<%= user_activity_id%>' name="reply[content]"></textarea>
               <div nhname='toolbar_container_<%= user_activity_id%>' style="float:left;padding-top:3px; margin-left: 5px;"></div>
-              <a id="new_message_submit_btn_<%= user_activity_id%>" href="javascript:void(0)" class="blue_n_btn fr" style="margin-top:6px;">发送</a>
+              <a id="new_message_submit_btn_<%= user_activity_id%>" href="javascript:void(0)" class="blue_n_btn fr" style="display:none;margin-top:6px;">发送</a>
               <div class="cl"></div>
               <p nhname='contentmsg_<%= user_activity_id%>'></p>
           <% end%>
diff --git a/app/views/users/_user_activities.html.erb b/app/views/users/_user_activities.html.erb
index 225304185..ea9c572d9 100644
--- a/app/views/users/_user_activities.html.erb
+++ b/app/views/users/_user_activities.html.erb
@@ -36,7 +36,7 @@
             }
 
             $(function() {
-                init_activity_KindEditor_data(<%= user_activity.id%>,"","87%");
+                init_activity_KindEditor_data(<%= user_activity.id%>,null,"87%");
             });
         </script>
         <% act= user_activity.act unless user_activity.act_type == "ProjectCreateInfo" %>
diff --git a/app/views/users/_user_homework_list.html.erb b/app/views/users/_user_homework_list.html.erb
index 6bc03e33d..cd596e22b 100644
--- a/app/views/users/_user_homework_list.html.erb
+++ b/app/views/users/_user_homework_list.html.erb
@@ -41,7 +41,7 @@
               <%= l(:label_end_time)%>：<%= homework_common.end_time%>
             </div>
           </div>
-          <div class="homepagePostIntro upload_img break_word">
+          <div class="homepagePostIntro upload_img break_word list_style">
             <%= homework_common.description.html_safe %>
           </div>
           <div class="mt10">
diff --git a/app/views/users/new_user_commit_homework.html.erb b/app/views/users/new_user_commit_homework.html.erb
index 19a971ece..c8998fd55 100644
--- a/app/views/users/new_user_commit_homework.html.erb
+++ b/app/views/users/new_user_commit_homework.html.erb
@@ -1,6 +1,8 @@
 <% content_for :header_tags do %>
-  <%= javascript_include_tag "/assets/kindeditor/kindeditor",'/assets/kindeditor/pasteimg'  %>
+  <%= javascript_include_tag "/assets/codemirror/codemirror_python_ruby_c"  %>
   <%= javascript_include_tag 'homework','baiduTemplate' %>
+  <%= stylesheet_link_tag "/assets/codemirror/codemirror" %>
+
 <% end %>
 
 <!-- 模板1开始，可以使用script（type设置为text/html）来存放模板片段，并且用id标示 -->
@@ -75,6 +77,7 @@
           <input type="hidden" name="is_test" value="<%=@is_test%>">
           <div class="mt15">
             <span>请使用 <%= @homework.language_name %> 语言编写</span>
+            <span data-language=<%=@homework.language%> style="display-hidden" id="data-language"></span>
             </div>
             <div class="mt10">
               <%= f.text_area :name, id: 'program-title', class:"InputBox  W700", placeholder:"请概括你的代码的功能" %>
diff --git a/app/views/users/user_homeworks.html.erb b/app/views/users/user_homeworks.html.erb
index f375496d1..a169be166 100644
--- a/app/views/users/user_homeworks.html.erb
+++ b/app/views/users/user_homeworks.html.erb
@@ -21,6 +21,7 @@
     <!-- 老师身份才可以发布作业 -->
     <div class="HomeWork mb10">
       <% homework = HomeworkCommon.new %>
+      <% homework.homework_detail_manual = HomeworkDetailManual.new%>
       <%= labelled_form_for homework,:url => user_new_homework_users_path,:method => "post" do |f| %>
           <div id="HomeWorkCon">
             <%= render :partial => 'users/user_homework_form', :locals => { :homework => homework,:f => f,:edit_mode => false } %>
diff --git a/app/views/users/user_messages.html.erb b/app/views/users/user_messages.html.erb
index 6445215d5..ac4572b5b 100644
--- a/app/views/users/user_messages.html.erb
+++ b/app/views/users/user_messages.html.erb
@@ -362,12 +362,12 @@
                       </li>
                       <li class="homepageNewsPubType fl">
                         <%=link_to inviter, user_path(inviter), :class => "newsBlue homepageNewsPublisher" %>
-                        <span class="<%= ma.viewed == 0 ? "homepageNewsTypeNotRead fl" : "homepageNewsType fl" %>">邀请你加入项目：</span>
+                        <span class='<%= ma.viewed == 0 ? 'homepageNewsTypeNotRead fl' : 'homepageNewsType fl' %>'>邀请你加入项目</span>
                       </li>
                       <% if ma.user.member_of?(ma.project) %>
-                        <li class="homepageNewsContent fl">
+                          <li class="homepageNewsContent fl">
                       <% else %>
-                        <li class="homepageHomeworkContent fl">
+                          <li class="homepageHomeworkContent fl">
                       <% end %>
                         <%= link_to ma.project, project_path(ma.project),
                                     :class => "#{ma.viewed == 0 ? "newsBlack" : "newsGrey"}",
@@ -377,13 +377,13 @@
                       <div style="display: none" class="message_title_red system_message_style">
                         <%= ma.project %>
                       </div>
-                      <% unless ma.user.member_of?(ma.project) %>
-                      <li  class="homepageHomeworkContentWarn fl">
-                        <%=link_to "同意加入", {:controller => 'projects', :action => 'member', :id => ma.project_id, :message_id =>ma.id,  :key => ma.secret_key},
-                                   :value => ma.secret_key,
-                                   :class => "green_btn_cir ml10",
-                                   :style => "color:#fff" %>
-                      </li>
+                      <% unless User.current.member_of?(ma.project) %>
+                          <li  class="homepageHomeworkContentWarn fl">
+                            <%=link_to "同意加入", {:controller => 'projects', :action => 'member', :id => ma.project_id, :message_id =>ma.id,  :key => ma.secret_key},
+                                       :value => ma.secret_key,
+                                       :class => "green_btn_cir ml10",
+                                       :style => "color:#fff" %>
+                          </li>
                       <% end %>
                       <li class="homepageNewsTime fl"><%= time_tag(ma.created_at).html_safe %> </li>
                     </ul>
diff --git a/db/schema.rb b/db/schema.rb
index 1c6760345..40daded12 100644
--- a/db/schema.rb
+++ b/db/schema.rb
@@ -476,13 +476,6 @@ ActiveRecord::Schema.define(:version => 20150918134804) do
 
   add_index "delayed_jobs", ["priority", "run_at"], :name => "delayed_jobs_priority"
 
-  create_table "discuss_demos", :force => true do |t|
-    t.string   "title"
-    t.text     "body"
-    t.datetime "created_at", :null => false
-    t.datetime "updated_at", :null => false
-  end
-
   create_table "documents", :force => true do |t|
     t.integer  "project_id",                :default => 0,  :null => false
     t.integer  "category_id",               :default => 0,  :null => false
@@ -497,23 +490,26 @@ ActiveRecord::Schema.define(:version => 20150918134804) do
   add_index "documents", ["created_on"], :name => "index_documents_on_created_on"
   add_index "documents", ["project_id"], :name => "documents_project_id"
 
-  create_table "dts", :force => true do |t|
-    t.string   "IPLineCode"
-    t.string   "Description"
-    t.string   "Num"
-    t.string   "Variable"
-    t.string   "TraceInfo"
-    t.string   "Method"
+  create_table "dts", :primary_key => "Num", :force => true do |t|
+    t.string   "Defect",        :limit => 50
+    t.string   "Category",      :limit => 50
     t.string   "File"
-    t.string   "IPLine"
-    t.string   "Review"
-    t.string   "Category"
-    t.string   "Defect"
-    t.string   "PreConditions"
-    t.string   "StartLine"
+    t.string   "Method"
+    t.string   "Module",        :limit => 20
+    t.string   "Variable",      :limit => 50
+    t.integer  "StartLine"
+    t.integer  "IPLine"
+    t.string   "IPLineCode",    :limit => 200
+    t.string   "Judge",         :limit => 15
+    t.integer  "Review",        :limit => 1
+    t.string   "Description"
+    t.text     "PreConditions", :limit => 2147483647
+    t.text     "TraceInfo",     :limit => 2147483647
+    t.text     "Code",          :limit => 2147483647
     t.integer  "project_id"
-    t.datetime "created_at",    :null => false
-    t.datetime "updated_at",    :null => false
+    t.datetime "created_at"
+    t.datetime "updated_at"
+    t.integer  "id",                                  :null => false
   end
 
   create_table "enabled_modules", :force => true do |t|
@@ -916,6 +912,7 @@ ActiveRecord::Schema.define(:version => 20150918134804) do
     t.datetime "created_on"
     t.integer  "comments_count",               :default => 0,  :null => false
     t.integer  "course_id"
+    t.datetime "updated_on"
   end
 
   add_index "news", ["author_id"], :name => "index_news_on_author_id"
diff --git a/public/assets/codemirror/clike.js b/public/assets/codemirror/clike.js
new file mode 100644
index 000000000..e13b79c14
--- /dev/null
+++ b/public/assets/codemirror/clike.js
@@ -0,0 +1,604 @@
+// CodeMirror, copyright (c) by Marijn Haverbeke and others
+// Distributed under an MIT license: http://codemirror.net/LICENSE
+
+(function(mod) {
+  if (typeof exports == "object" && typeof module == "object") // CommonJS
+    mod(require("../../lib/codemirror"));
+  else if (typeof define == "function" && define.amd) // AMD
+    define(["../../lib/codemirror"], mod);
+  else // Plain browser env
+    mod(CodeMirror);
+})(function(CodeMirror) {
+"use strict";
+
+CodeMirror.defineMode("clike", function(config, parserConfig) {
+  var indentUnit = config.indentUnit,
+      statementIndentUnit = parserConfig.statementIndentUnit || indentUnit,
+      dontAlignCalls = parserConfig.dontAlignCalls,
+      keywords = parserConfig.keywords || {},
+      types = parserConfig.types || {},
+      builtin = parserConfig.builtin || {},
+      blockKeywords = parserConfig.blockKeywords || {},
+      defKeywords = parserConfig.defKeywords || {},
+      atoms = parserConfig.atoms || {},
+      hooks = parserConfig.hooks || {},
+      multiLineStrings = parserConfig.multiLineStrings,
+      indentStatements = parserConfig.indentStatements !== false,
+      indentSwitch = parserConfig.indentSwitch !== false,
+      namespaceSeparator = parserConfig.namespaceSeparator;
+  var isOperatorChar = /[+\-*&%=<>!?|\/]/;
+
+  var curPunc, isDefKeyword;
+
+  function tokenBase(stream, state) {
+    var ch = stream.next();
+    if (hooks[ch]) {
+      var result = hooks[ch](stream, state);
+      if (result !== false) return result;
+    }
+    if (ch == '"' || ch == "'") {
+      state.tokenize = tokenString(ch);
+      return state.tokenize(stream, state);
+    }
+    if (/[\[\]{}\(\),;\:\.]/.test(ch)) {
+      curPunc = ch;
+      return null;
+    }
+    if (/\d/.test(ch)) {
+      stream.eatWhile(/[\w\.]/);
+      return "number";
+    }
+    if (ch == "/") {
+      if (stream.eat("*")) {
+        state.tokenize = tokenComment;
+        return tokenComment(stream, state);
+      }
+      if (stream.eat("/")) {
+        stream.skipToEnd();
+        return "comment";
+      }
+    }
+    if (isOperatorChar.test(ch)) {
+      stream.eatWhile(isOperatorChar);
+      return "operator";
+    }
+    stream.eatWhile(/[\w\$_\xa1-\uffff]/);
+    if (namespaceSeparator) while (stream.match(namespaceSeparator))
+      stream.eatWhile(/[\w\$_\xa1-\uffff]/);
+
+    var cur = stream.current();
+    if (keywords.propertyIsEnumerable(cur)) {
+      if (blockKeywords.propertyIsEnumerable(cur)) curPunc = "newstatement";
+      if (defKeywords.propertyIsEnumerable(cur)) isDefKeyword = true;
+      return "keyword";
+    }
+    if (types.propertyIsEnumerable(cur)) return "variable-3";
+    if (builtin.propertyIsEnumerable(cur)) {
+      if (blockKeywords.propertyIsEnumerable(cur)) curPunc = "newstatement";
+      return "builtin";
+    }
+    if (atoms.propertyIsEnumerable(cur)) return "atom";
+    return "variable";
+  }
+
+  function tokenString(quote) {
+    return function(stream, state) {
+      var escaped = false, next, end = false;
+      while ((next = stream.next()) != null) {
+        if (next == quote && !escaped) {end = true; break;}
+        escaped = !escaped && next == "\\";
+      }
+      if (end || !(escaped || multiLineStrings))
+        state.tokenize = null;
+      return "string";
+    };
+  }
+
+  function tokenComment(stream, state) {
+    var maybeEnd = false, ch;
+    while (ch = stream.next()) {
+      if (ch == "/" && maybeEnd) {
+        state.tokenize = null;
+        break;
+      }
+      maybeEnd = (ch == "*");
+    }
+    return "comment";
+  }
+
+  function Context(indented, column, type, align, prev) {
+    this.indented = indented;
+    this.column = column;
+    this.type = type;
+    this.align = align;
+    this.prev = prev;
+  }
+  function isStatement(type) {
+    return type == "statement" || type == "switchstatement" || type == "namespace";
+  }
+  function pushContext(state, col, type) {
+    var indent = state.indented;
+    if (state.context && isStatement(state.context.type) && !isStatement(type))
+      indent = state.context.indented;
+    return state.context = new Context(indent, col, type, null, state.context);
+  }
+  function popContext(state) {
+    var t = state.context.type;
+    if (t == ")" || t == "]" || t == "}")
+      state.indented = state.context.indented;
+    return state.context = state.context.prev;
+  }
+
+  function typeBefore(stream, state) {
+    if (state.prevToken == "variable" || state.prevToken == "variable-3") return true;
+    if (/\S(?:[^- ]>|[*\]])\s*$|\*$/.test(stream.string.slice(0, stream.start))) return true;
+  }
+
+  function isTopScope(context) {
+    for (;;) {
+      if (!context || context.type == "top") return true;
+      if (context.type == "}" && context.prev.type != "namespace") return false;
+      context = context.prev;
+    }
+  }
+
+  // Interface
+
+  return {
+    startState: function(basecolumn) {
+      return {
+        tokenize: null,
+        context: new Context((basecolumn || 0) - indentUnit, 0, "top", false),
+        indented: 0,
+        startOfLine: true,
+        prevToken: null
+      };
+    },
+
+    token: function(stream, state) {
+      var ctx = state.context;
+      if (stream.sol()) {
+        if (ctx.align == null) ctx.align = false;
+        state.indented = stream.indentation();
+        state.startOfLine = true;
+      }
+      if (stream.eatSpace()) return null;
+      curPunc = isDefKeyword = null;
+      var style = (state.tokenize || tokenBase)(stream, state);
+      if (style == "comment" || style == "meta") return style;
+      if (ctx.align == null) ctx.align = true;
+
+      if ((curPunc == ";" || curPunc == ":" || curPunc == ","))
+        while (isStatement(state.context.type)) popContext(state);
+      else if (curPunc == "{") pushContext(state, stream.column(), "}");
+      else if (curPunc == "[") pushContext(state, stream.column(), "]");
+      else if (curPunc == "(") pushContext(state, stream.column(), ")");
+      else if (curPunc == "}") {
+        while (isStatement(ctx.type)) ctx = popContext(state);
+        if (ctx.type == "}") ctx = popContext(state);
+        while (isStatement(ctx.type)) ctx = popContext(state);
+      }
+      else if (curPunc == ctx.type) popContext(state);
+      else if (indentStatements &&
+               (((ctx.type == "}" || ctx.type == "top") && curPunc != ";") ||
+                (isStatement(ctx.type) && curPunc == "newstatement"))) {
+        var type = "statement";
+        if (curPunc == "newstatement" && indentSwitch && stream.current() == "switch")
+          type = "switchstatement";
+        else if (style == "keyword" && stream.current() == "namespace")
+          type = "namespace";
+        pushContext(state, stream.column(), type);
+      }
+
+      if (style == "variable" &&
+          ((state.prevToken == "def" ||
+            (parserConfig.typeFirstDefinitions && typeBefore(stream, state) &&
+             isTopScope(state.context) && stream.match(/^\s*\(/, false)))))
+        style = "def";
+
+      if (hooks.token) {
+        var result = hooks.token(stream, state, style);
+        if (result !== undefined) style = result;
+      }
+
+      if (style == "def" && parserConfig.styleDefs === false) style = "variable";
+
+      state.startOfLine = false;
+      state.prevToken = isDefKeyword ? "def" : style || curPunc;
+      return style;
+    },
+
+    indent: function(state, textAfter) {
+      if (state.tokenize != tokenBase && state.tokenize != null) return CodeMirror.Pass;
+      var ctx = state.context, firstChar = textAfter && textAfter.charAt(0);
+      if (isStatement(ctx.type) && firstChar == "}") ctx = ctx.prev;
+      var closing = firstChar == ctx.type;
+      var switchBlock = ctx.prev && ctx.prev.type == "switchstatement";
+      if (isStatement(ctx.type))
+        return ctx.indented + (firstChar == "{" ? 0 : statementIndentUnit);
+      if (ctx.align && (!dontAlignCalls || ctx.type != ")"))
+        return ctx.column + (closing ? 0 : 1);
+      if (ctx.type == ")" && !closing)
+        return ctx.indented + statementIndentUnit;
+
+      return ctx.indented + (closing ? 0 : indentUnit) +
+        (!closing && switchBlock && !/^(?:case|default)\b/.test(textAfter) ? indentUnit : 0);
+    },
+
+    electricInput: indentSwitch ? /^\s*(?:case .*?:|default:|\{\}?|\})$/ : /^\s*[{}]$/,
+    blockCommentStart: "/*",
+    blockCommentEnd: "*/",
+    lineComment: "//",
+    fold: "brace"
+  };
+});
+
+  function words(str) {
+    var obj = {}, words = str.split(" ");
+    for (var i = 0; i < words.length; ++i) obj[words[i]] = true;
+    return obj;
+  }
+  var cKeywords = "auto if break case register continue return default do sizeof " +
+    "static else struct switch extern typedef float union for " +
+    "goto while enum const volatile";
+  var cTypes = "int long char short double float unsigned signed void size_t ptrdiff_t";
+
+  function cppHook(stream, state) {
+    if (!state.startOfLine) return false;
+    for (;;) {
+      if (stream.skipTo("\\")) {
+        stream.next();
+        if (stream.eol()) {
+          state.tokenize = cppHook;
+          break;
+        }
+      } else {
+        stream.skipToEnd();
+        state.tokenize = null;
+        break;
+      }
+    }
+    return "meta";
+  }
+
+  function pointerHook(_stream, state) {
+    if (state.prevToken == "variable-3") return "variable-3";
+    return false;
+  }
+
+  function cpp11StringHook(stream, state) {
+    stream.backUp(1);
+    // Raw strings.
+    if (stream.match(/(R|u8R|uR|UR|LR)/)) {
+      var match = stream.match(/"([^\s\\()]{0,16})\(/);
+      if (!match) {
+        return false;
+      }
+      state.cpp11RawStringDelim = match[1];
+      state.tokenize = tokenRawString;
+      return tokenRawString(stream, state);
+    }
+    // Unicode strings/chars.
+    if (stream.match(/(u8|u|U|L)/)) {
+      if (stream.match(/["']/, /* eat */ false)) {
+        return "string";
+      }
+      return false;
+    }
+    // Ignore this hook.
+    stream.next();
+    return false;
+  }
+
+  function cppLooksLikeConstructor(word) {
+    var lastTwo = /(\w+)::(\w+)$/.exec(word);
+    return lastTwo && lastTwo[1] == lastTwo[2];
+  }
+
+  // C#-style strings where "" escapes a quote.
+  function tokenAtString(stream, state) {
+    var next;
+    while ((next = stream.next()) != null) {
+      if (next == '"' && !stream.eat('"')) {
+        state.tokenize = null;
+        break;
+      }
+    }
+    return "string";
+  }
+
+  // C++11 raw string literal is <prefix>"<delim>( anything )<delim>", where
+  // <delim> can be a string up to 16 characters long.
+  function tokenRawString(stream, state) {
+    // Escape characters that have special regex meanings.
+    var delim = state.cpp11RawStringDelim.replace(/[^\w\s]/g, '\\$&');
+    var match = stream.match(new RegExp(".*?\\)" + delim + '"'));
+    if (match)
+      state.tokenize = null;
+    else
+      stream.skipToEnd();
+    return "string";
+  }
+
+  function def(mimes, mode) {
+    if (typeof mimes == "string") mimes = [mimes];
+    var words = [];
+    function add(obj) {
+      if (obj) for (var prop in obj) if (obj.hasOwnProperty(prop))
+        words.push(prop);
+    }
+    add(mode.keywords);
+    add(mode.types);
+    add(mode.builtin);
+    add(mode.atoms);
+    if (words.length) {
+      mode.helperType = mimes[0];
+      CodeMirror.registerHelper("hintWords", mimes[0], words);
+    }
+
+    for (var i = 0; i < mimes.length; ++i)
+      CodeMirror.defineMIME(mimes[i], mode);
+  }
+
+  def(["text/x-csrc", "text/x-c", "text/x-chdr"], {
+    name: "clike",
+    keywords: words(cKeywords),
+    types: words(cTypes + " bool _Complex _Bool float_t double_t intptr_t intmax_t " +
+                 "int8_t int16_t int32_t int64_t uintptr_t uintmax_t uint8_t uint16_t " +
+                 "uint32_t uint64_t"),
+    blockKeywords: words("case do else for if switch while struct"),
+    defKeywords: words("struct"),
+    typeFirstDefinitions: true,
+    atoms: words("null true false"),
+    hooks: {"#": cppHook, "*": pointerHook},
+    modeProps: {fold: ["brace", "include"]}
+  });
+
+  def(["text/x-c++src", "text/x-c++hdr"], {
+    name: "clike",
+    keywords: words(cKeywords + " asm dynamic_cast namespace reinterpret_cast try explicit new " +
+                    "static_cast typeid catch operator template typename class friend private " +
+                    "this using const_cast inline public throw virtual delete mutable protected " +
+                    "alignas alignof constexpr decltype nullptr noexcept thread_local final " +
+                    "static_assert override"),
+    types: words(cTypes + " bool wchar_t"),
+    blockKeywords: words("catch class do else finally for if struct switch try while"),
+    defKeywords: words("class namespace struct enum union"),
+    typeFirstDefinitions: true,
+    atoms: words("true false null"),
+    hooks: {
+      "#": cppHook,
+      "*": pointerHook,
+      "u": cpp11StringHook,
+      "U": cpp11StringHook,
+      "L": cpp11StringHook,
+      "R": cpp11StringHook,
+      token: function(stream, state, style) {
+        if (style == "variable" && stream.peek() == "(" &&
+            (state.prevToken == ";" || state.prevToken == null ||
+             state.prevToken == "}") &&
+            cppLooksLikeConstructor(stream.current()))
+          return "def";
+      }
+    },
+    namespaceSeparator: "::",
+    modeProps: {fold: ["brace", "include"]}
+  });
+
+  def("text/x-java", {
+    name: "clike",
+    keywords: words("abstract assert break case catch class const continue default " +
+                    "do else enum extends final finally float for goto if implements import " +
+                    "instanceof interface native new package private protected public " +
+                    "return static strictfp super switch synchronized this throw throws transient " +
+                    "try volatile while"),
+    types: words("byte short int long float double boolean char void Boolean Byte Character Double Float " +
+                 "Integer Long Number Object Short String StringBuffer StringBuilder Void"),
+    blockKeywords: words("catch class do else finally for if switch try while"),
+    defKeywords: words("class interface package enum"),
+    typeFirstDefinitions: true,
+    atoms: words("true false null"),
+    hooks: {
+      "@": function(stream) {
+        stream.eatWhile(/[\w\$_]/);
+        return "meta";
+      }
+    },
+    modeProps: {fold: ["brace", "import"]}
+  });
+
+  def("text/x-csharp", {
+    name: "clike",
+    keywords: words("abstract as async await base break case catch checked class const continue" +
+                    " default delegate do else enum event explicit extern finally fixed for" +
+                    " foreach goto if implicit in interface internal is lock namespace new" +
+                    " operator out override params private protected public readonly ref return sealed" +
+                    " sizeof stackalloc static struct switch this throw try typeof unchecked" +
+                    " unsafe using virtual void volatile while add alias ascending descending dynamic from get" +
+                    " global group into join let orderby partial remove select set value var yield"),
+    types: words("Action Boolean Byte Char DateTime DateTimeOffset Decimal Double Func" +
+                 " Guid Int16 Int32 Int64 Object SByte Single String Task TimeSpan UInt16 UInt32" +
+                 " UInt64 bool byte char decimal double short int long object"  +
+                 " sbyte float string ushort uint ulong"),
+    blockKeywords: words("catch class do else finally for foreach if struct switch try while"),
+    defKeywords: words("class interface namespace struct var"),
+    typeFirstDefinitions: true,
+    atoms: words("true false null"),
+    hooks: {
+      "@": function(stream, state) {
+        if (stream.eat('"')) {
+          state.tokenize = tokenAtString;
+          return tokenAtString(stream, state);
+        }
+        stream.eatWhile(/[\w\$_]/);
+        return "meta";
+      }
+    }
+  });
+
+  function tokenTripleString(stream, state) {
+    var escaped = false;
+    while (!stream.eol()) {
+      if (!escaped && stream.match('"""')) {
+        state.tokenize = null;
+        break;
+      }
+      escaped = stream.next() == "\\" && !escaped;
+    }
+    return "string";
+  }
+
+  def("text/x-scala", {
+    name: "clike",
+    keywords: words(
+
+      /* scala */
+      "abstract case catch class def do else extends false final finally for forSome if " +
+      "implicit import lazy match new null object override package private protected return " +
+      "sealed super this throw trait try type val var while with yield _ : = => <- <: " +
+      "<% >: # @ " +
+
+      /* package scala */
+      "assert assume require print println printf readLine readBoolean readByte readShort " +
+      "readChar readInt readLong readFloat readDouble " +
+
+      ":: #:: "
+    ),
+    types: words(
+      "AnyVal App Application Array BufferedIterator BigDecimal BigInt Char Console Either " +
+      "Enumeration Equiv Error Exception Fractional Function IndexedSeq Integral Iterable " +
+      "Iterator List Map Numeric Nil NotNull Option Ordered Ordering PartialFunction PartialOrdering " +
+      "Product Proxy Range Responder Seq Serializable Set Specializable Stream StringBuilder " +
+      "StringContext Symbol Throwable Traversable TraversableOnce Tuple Unit Vector " +
+
+      /* package java.lang */
+      "Boolean Byte Character CharSequence Class ClassLoader Cloneable Comparable " +
+      "Compiler Double Exception Float Integer Long Math Number Object Package Pair Process " +
+      "Runtime Runnable SecurityManager Short StackTraceElement StrictMath String " +
+      "StringBuffer System Thread ThreadGroup ThreadLocal Throwable Triple Void"
+    ),
+    multiLineStrings: true,
+    blockKeywords: words("catch class do else finally for forSome if match switch try while"),
+    defKeywords: words("class def object package trait type val var"),
+    atoms: words("true false null"),
+    indentStatements: false,
+    indentSwitch: false,
+    hooks: {
+      "@": function(stream) {
+        stream.eatWhile(/[\w\$_]/);
+        return "meta";
+      },
+      '"': function(stream, state) {
+        if (!stream.match('""')) return false;
+        state.tokenize = tokenTripleString;
+        return state.tokenize(stream, state);
+      },
+      "'": function(stream) {
+        stream.eatWhile(/[\w\$_\xa1-\uffff]/);
+        return "atom";
+      }
+    },
+    modeProps: {closeBrackets: {triples: '"'}}
+  });
+
+  def(["x-shader/x-vertex", "x-shader/x-fragment"], {
+    name: "clike",
+    keywords: words("sampler1D sampler2D sampler3D samplerCube " +
+                    "sampler1DShadow sampler2DShadow " +
+                    "const attribute uniform varying " +
+                    "break continue discard return " +
+                    "for while do if else struct " +
+                    "in out inout"),
+    types: words("float int bool void " +
+                 "vec2 vec3 vec4 ivec2 ivec3 ivec4 bvec2 bvec3 bvec4 " +
+                 "mat2 mat3 mat4"),
+    blockKeywords: words("for while do if else struct"),
+    builtin: words("radians degrees sin cos tan asin acos atan " +
+                    "pow exp log exp2 sqrt inversesqrt " +
+                    "abs sign floor ceil fract mod min max clamp mix step smoothstep " +
+                    "length distance dot cross normalize ftransform faceforward " +
+                    "reflect refract matrixCompMult " +
+                    "lessThan lessThanEqual greaterThan greaterThanEqual " +
+                    "equal notEqual any all not " +
+                    "texture1D texture1DProj texture1DLod texture1DProjLod " +
+                    "texture2D texture2DProj texture2DLod texture2DProjLod " +
+                    "texture3D texture3DProj texture3DLod texture3DProjLod " +
+                    "textureCube textureCubeLod " +
+                    "shadow1D shadow2D shadow1DProj shadow2DProj " +
+                    "shadow1DLod shadow2DLod shadow1DProjLod shadow2DProjLod " +
+                    "dFdx dFdy fwidth " +
+                    "noise1 noise2 noise3 noise4"),
+    atoms: words("true false " +
+                "gl_FragColor gl_SecondaryColor gl_Normal gl_Vertex " +
+                "gl_MultiTexCoord0 gl_MultiTexCoord1 gl_MultiTexCoord2 gl_MultiTexCoord3 " +
+                "gl_MultiTexCoord4 gl_MultiTexCoord5 gl_MultiTexCoord6 gl_MultiTexCoord7 " +
+                "gl_FogCoord gl_PointCoord " +
+                "gl_Position gl_PointSize gl_ClipVertex " +
+                "gl_FrontColor gl_BackColor gl_FrontSecondaryColor gl_BackSecondaryColor " +
+                "gl_TexCoord gl_FogFragCoord " +
+                "gl_FragCoord gl_FrontFacing " +
+                "gl_FragData gl_FragDepth " +
+                "gl_ModelViewMatrix gl_ProjectionMatrix gl_ModelViewProjectionMatrix " +
+                "gl_TextureMatrix gl_NormalMatrix gl_ModelViewMatrixInverse " +
+                "gl_ProjectionMatrixInverse gl_ModelViewProjectionMatrixInverse " +
+                "gl_TexureMatrixTranspose gl_ModelViewMatrixInverseTranspose " +
+                "gl_ProjectionMatrixInverseTranspose " +
+                "gl_ModelViewProjectionMatrixInverseTranspose " +
+                "gl_TextureMatrixInverseTranspose " +
+                "gl_NormalScale gl_DepthRange gl_ClipPlane " +
+                "gl_Point gl_FrontMaterial gl_BackMaterial gl_LightSource gl_LightModel " +
+                "gl_FrontLightModelProduct gl_BackLightModelProduct " +
+                "gl_TextureColor gl_EyePlaneS gl_EyePlaneT gl_EyePlaneR gl_EyePlaneQ " +
+                "gl_FogParameters " +
+                "gl_MaxLights gl_MaxClipPlanes gl_MaxTextureUnits gl_MaxTextureCoords " +
+                "gl_MaxVertexAttribs gl_MaxVertexUniformComponents gl_MaxVaryingFloats " +
+                "gl_MaxVertexTextureImageUnits gl_MaxTextureImageUnits " +
+                "gl_MaxFragmentUniformComponents gl_MaxCombineTextureImageUnits " +
+                "gl_MaxDrawBuffers"),
+    indentSwitch: false,
+    hooks: {"#": cppHook},
+    modeProps: {fold: ["brace", "include"]}
+  });
+
+  def("text/x-nesc", {
+    name: "clike",
+    keywords: words(cKeywords + "as atomic async call command component components configuration event generic " +
+                    "implementation includes interface module new norace nx_struct nx_union post provides " +
+                    "signal task uses abstract extends"),
+    types: words(cTypes),
+    blockKeywords: words("case do else for if switch while struct"),
+    atoms: words("null true false"),
+    hooks: {"#": cppHook},
+    modeProps: {fold: ["brace", "include"]}
+  });
+
+  def("text/x-objectivec", {
+    name: "clike",
+    keywords: words(cKeywords + "inline restrict _Bool _Complex _Imaginery BOOL Class bycopy byref id IMP in " +
+                    "inout nil oneway out Protocol SEL self super atomic nonatomic retain copy readwrite readonly"),
+    types: words(cTypes),
+    atoms: words("YES NO NULL NILL ON OFF true false"),
+    hooks: {
+      "@": function(stream) {
+        stream.eatWhile(/[\w\$]/);
+        return "keyword";
+      },
+      "#": cppHook
+    },
+    modeProps: {fold: "brace"}
+  });
+
+  def("text/x-squirrel", {
+    name: "clike",
+    keywords: words("base break clone continue const default delete enum extends function in class" +
+                    " foreach local resume return this throw typeof yield constructor instanceof static"),
+    types: words(cTypes),
+    blockKeywords: words("case catch class else for foreach if switch try while"),
+    defKeywords: words("function local class"),
+    typeFirstDefinitions: true,
+    atoms: words("true false null"),
+    hooks: {"#": cppHook},
+    modeProps: {fold: ["brace", "include"]}
+  });
+
+});
diff --git a/public/assets/codemirror/codemirror.css b/public/assets/codemirror/codemirror.css
new file mode 100644
index 000000000..12a488ad5
--- /dev/null
+++ b/public/assets/codemirror/codemirror.css
@@ -0,0 +1,335 @@
+/* BASICS */
+
+.CodeMirror {
+  /* Set height, width, borders, and global font properties here */
+  font-family: monospace;
+  height: 300px;
+  color: black;
+  border: 1px solid #D9D9D9;
+}
+
+/* PADDING */
+
+.CodeMirror-lines {
+  padding: 4px 0; /* Vertical padding around content */
+}
+.CodeMirror pre {
+  padding: 0 4px; /* Horizontal padding of content */
+}
+
+.CodeMirror-scrollbar-filler, .CodeMirror-gutter-filler {
+  background-color: white; /* The little square between H and V scrollbars */
+}
+
+/* GUTTER */
+
+.CodeMirror-gutters {
+  border-right: 1px solid #ddd;
+  background-color: #f7f7f7;
+  white-space: nowrap;
+}
+.CodeMirror-linenumbers {}
+.CodeMirror-linenumber {
+  padding: 0 3px 0 5px;
+  min-width: 20px;
+  text-align: right;
+  color: #999;
+  white-space: nowrap;
+}
+
+.CodeMirror-guttermarker { color: black; }
+.CodeMirror-guttermarker-subtle { color: #999; }
+
+/* CURSOR */
+
+.CodeMirror-cursor {
+  border-left: 1px solid black;
+  border-right: none;
+  width: 0;
+}
+/* Shown when moving in bi-directional text */
+.CodeMirror div.CodeMirror-secondarycursor {
+  border-left: 1px solid silver;
+}
+.cm-fat-cursor .CodeMirror-cursor {
+  width: auto;
+  border: 0;
+  background: #7e7;
+}
+.cm-fat-cursor div.CodeMirror-cursors {
+  z-index: 1;
+}
+
+.cm-animate-fat-cursor {
+  width: auto;
+  border: 0;
+  -webkit-animation: blink 1.06s steps(1) infinite;
+  -moz-animation: blink 1.06s steps(1) infinite;
+  animation: blink 1.06s steps(1) infinite;
+  background-color: #7e7;
+}
+@-moz-keyframes blink {
+  0% {}
+  50% { background-color: transparent; }
+  100% {}
+}
+@-webkit-keyframes blink {
+  0% {}
+  50% { background-color: transparent; }
+  100% {}
+}
+@keyframes blink {
+  0% {}
+  50% { background-color: transparent; }
+  100% {}
+}
+
+/* Can style cursor different in overwrite (non-insert) mode */
+.CodeMirror-overwrite .CodeMirror-cursor {}
+
+.cm-tab { display: inline-block; text-decoration: inherit; }
+
+.CodeMirror-ruler {
+  border-left: 1px solid #ccc;
+  position: absolute;
+}
+
+/* DEFAULT THEME */
+
+.cm-s-default .cm-header {color: blue;}
+.cm-s-default .cm-quote {color: #090;}
+.cm-negative {color: #d44;}
+.cm-positive {color: #292;}
+.cm-header, .cm-strong {font-weight: bold;}
+.cm-em {font-style: italic;}
+.cm-link {text-decoration: underline;}
+.cm-strikethrough {text-decoration: line-through;}
+
+.cm-s-default .cm-keyword {color: #708;}
+.cm-s-default .cm-atom {color: #219;}
+.cm-s-default .cm-number {color: #164;}
+.cm-s-default .cm-def {color: #00f;}
+.cm-s-default .cm-variable,
+.cm-s-default .cm-punctuation,
+.cm-s-default .cm-property,
+.cm-s-default .cm-operator {}
+.cm-s-default .cm-variable-2 {color: #05a;}
+.cm-s-default .cm-variable-3 {color: #085;}
+.cm-s-default .cm-comment {color: #a50;}
+.cm-s-default .cm-string {color: #a11;}
+.cm-s-default .cm-string-2 {color: #f50;}
+.cm-s-default .cm-meta {color: #555;}
+.cm-s-default .cm-qualifier {color: #555;}
+.cm-s-default .cm-builtin {color: #30a;}
+.cm-s-default .cm-bracket {color: #997;}
+.cm-s-default .cm-tag {color: #170;}
+.cm-s-default .cm-attribute {color: #00c;}
+.cm-s-default .cm-hr {color: #999;}
+.cm-s-default .cm-link {color: #00c;}
+
+.cm-s-default .cm-error {color: #f00;}
+.cm-invalidchar {color: #f00;}
+
+.CodeMirror-composing { border-bottom: 2px solid; }
+
+/* Default styles for common addons */
+
+div.CodeMirror span.CodeMirror-matchingbracket {color: #0f0;}
+div.CodeMirror span.CodeMirror-nonmatchingbracket {color: #f22;}
+.CodeMirror-matchingtag { background: rgba(255, 150, 0, .3); }
+.CodeMirror-activeline-background {background: #e8f2ff;}
+
+/* STOP */
+
+/* The rest of this file contains styles related to the mechanics of
+   the editor. You probably shouldn't touch them. */
+
+.CodeMirror {
+  position: relative;
+  overflow: hidden;
+  background: white;
+}
+
+.CodeMirror-scroll {
+  overflow: scroll !important; /* Things will break if this is overridden */
+  /* 30px is the magic margin used to hide the element's real scrollbars */
+  /* See overflow: hidden in .CodeMirror */
+  margin-bottom: -30px; margin-right: -30px;
+  padding-bottom: 30px;
+  height: 100%;
+  outline: none; /* Prevent dragging from highlighting the element */
+  position: relative;
+}
+.CodeMirror-sizer {
+  position: relative;
+  border-right: 30px solid transparent;
+}
+
+/* The fake, visible scrollbars. Used to force redraw during scrolling
+   before actuall scrolling happens, thus preventing shaking and
+   flickering artifacts. */
+.CodeMirror-vscrollbar, .CodeMirror-hscrollbar, .CodeMirror-scrollbar-filler, .CodeMirror-gutter-filler {
+  position: absolute;
+  z-index: 6;
+  display: none;
+}
+.CodeMirror-vscrollbar {
+  right: 0; top: 0;
+  overflow-x: hidden;
+  overflow-y: scroll;
+}
+.CodeMirror-hscrollbar {
+  bottom: 0; left: 0;
+  overflow-y: hidden;
+  overflow-x: scroll;
+}
+.CodeMirror-scrollbar-filler {
+  right: 0; bottom: 0;
+}
+.CodeMirror-gutter-filler {
+  left: 0; bottom: 0;
+}
+
+.CodeMirror-gutters {
+  position: absolute; left: 0; top: 0;
+  z-index: 3;
+}
+.CodeMirror-gutter {
+  white-space: normal;
+  height: 100%;
+  display: inline-block;
+  margin-bottom: -30px;
+  /* Hack to make IE7 behave */
+  *zoom:1;
+  *display:inline;
+}
+.CodeMirror-gutter-wrapper {
+  position: absolute;
+  z-index: 4;
+  background: none !important;
+  border: none !important;
+}
+.CodeMirror-gutter-background {
+  position: absolute;
+  top: 0; bottom: 0;
+  z-index: 4;
+}
+.CodeMirror-gutter-elt {
+  position: absolute;
+  cursor: default;
+  z-index: 4;
+}
+.CodeMirror-gutter-wrapper {
+  -webkit-user-select: none;
+  -moz-user-select: none;
+  user-select: none;
+}
+
+.CodeMirror-lines {
+  cursor: text;
+  min-height: 1px; /* prevents collapsing before first draw */
+}
+.CodeMirror pre {
+  /* Reset some styles that the rest of the page might have set */
+  -moz-border-radius: 0; -webkit-border-radius: 0; border-radius: 0;
+  border-width: 0;
+  background: transparent;
+  font-family: inherit;
+  font-size: inherit;
+  margin: 0;
+  white-space: pre;
+  word-wrap: normal;
+  line-height: inherit;
+  color: inherit;
+  z-index: 2;
+  position: relative;
+  overflow: visible;
+  -webkit-tap-highlight-color: transparent;
+}
+.CodeMirror-wrap pre {
+  word-wrap: break-word;
+  white-space: pre-wrap;
+  word-break: normal;
+}
+
+.CodeMirror-linebackground {
+  position: absolute;
+  left: 0; right: 0; top: 0; bottom: 0;
+  z-index: 0;
+}
+
+.CodeMirror-linewidget {
+  position: relative;
+  z-index: 2;
+  overflow: auto;
+}
+
+.CodeMirror-widget {}
+
+.CodeMirror-code {
+  outline: none;
+}
+
+/* Force content-box sizing for the elements where we expect it */
+.CodeMirror-scroll,
+.CodeMirror-sizer,
+.CodeMirror-gutter,
+.CodeMirror-gutters,
+.CodeMirror-linenumber {
+  -moz-box-sizing: content-box;
+  box-sizing: content-box;
+}
+
+.CodeMirror-measure {
+  position: absolute;
+  width: 100%;
+  height: 0;
+  overflow: hidden;
+  visibility: hidden;
+}
+
+.CodeMirror-cursor { position: absolute; }
+.CodeMirror-measure pre { position: static; }
+
+div.CodeMirror-cursors {
+  visibility: hidden;
+  position: relative;
+  z-index: 3;
+}
+div.CodeMirror-dragcursors {
+  visibility: visible;
+}
+
+.CodeMirror-focused div.CodeMirror-cursors {
+  visibility: visible;
+}
+
+.CodeMirror-selected { background: #d9d9d9; }
+.CodeMirror-focused .CodeMirror-selected { background: #d7d4f0; }
+.CodeMirror-crosshair { cursor: crosshair; }
+.CodeMirror-line::selection, .CodeMirror-line > span::selection, .CodeMirror-line > span > span::selection { background: #d7d4f0; }
+.CodeMirror-line::-moz-selection, .CodeMirror-line > span::-moz-selection, .CodeMirror-line > span > span::-moz-selection { background: #d7d4f0; }
+
+.cm-searching {
+  background: #ffa;
+  background: rgba(255, 255, 0, .4);
+}
+
+/* IE7 hack to prevent it from returning funny offsetTops on the spans */
+.CodeMirror span { *vertical-align: text-bottom; }
+
+/* Used to force a border model for a node */
+.cm-force-border { padding-right: .1px; }
+
+@media print {
+  /* Hide the cursor when printing */
+  .CodeMirror div.CodeMirror-cursors {
+    visibility: hidden;
+  }
+}
+
+/* See issue #2901 */
+.cm-tab-wrap-hack:after { content: ''; }
+
+/* Help users use markselection to safely style text background */
+span.CodeMirror-selectedtext { background: none; }
diff --git a/public/assets/codemirror/codemirror.js b/public/assets/codemirror/codemirror.js
new file mode 100644
index 000000000..5de8a1332
--- /dev/null
+++ b/public/assets/codemirror/codemirror.js
@@ -0,0 +1,8822 @@
+// CodeMirror, copyright (c) by Marijn Haverbeke and others
+// Distributed under an MIT license: http://codemirror.net/LICENSE
+
+// This is CodeMirror (http://codemirror.net), a code editor
+// implemented in JavaScript on top of the browser's DOM.
+//
+// You can find some technical background for some of the code below
+// at http://marijnhaverbeke.nl/blog/#cm-internals .
+
+(function(mod) {
+  if (typeof exports == "object" && typeof module == "object") // CommonJS
+    module.exports = mod();
+  else if (typeof define == "function" && define.amd) // AMD
+    return define([], mod);
+  else // Plain browser env
+    this.CodeMirror = mod();
+})(function() {
+  "use strict";
+
+  // BROWSER SNIFFING
+
+  // Kludges for bugs and behavior differences that can't be feature
+  // detected are enabled based on userAgent etc sniffing.
+
+  var gecko = /gecko\/\d/i.test(navigator.userAgent);
+  var ie_upto10 = /MSIE \d/.test(navigator.userAgent);
+  var ie_11up = /Trident\/(?:[7-9]|\d{2,})\..*rv:(\d+)/.exec(navigator.userAgent);
+  var ie = ie_upto10 || ie_11up;
+  var ie_version = ie && (ie_upto10 ? document.documentMode || 6 : ie_11up[1]);
+  var webkit = /WebKit\//.test(navigator.userAgent);
+  var qtwebkit = webkit && /Qt\/\d+\.\d+/.test(navigator.userAgent);
+  var chrome = /Chrome\//.test(navigator.userAgent);
+  var presto = /Opera\//.test(navigator.userAgent);
+  var safari = /Apple Computer/.test(navigator.vendor);
+  var mac_geMountainLion = /Mac OS X 1\d\D([8-9]|\d\d)\D/.test(navigator.userAgent);
+  var phantom = /PhantomJS/.test(navigator.userAgent);
+
+  var ios = /AppleWebKit/.test(navigator.userAgent) && /Mobile\/\w+/.test(navigator.userAgent);
+  // This is woefully incomplete. Suggestions for alternative methods welcome.
+  var mobile = ios || /Android|webOS|BlackBerry|Opera Mini|Opera Mobi|IEMobile/i.test(navigator.userAgent);
+  var mac = ios || /Mac/.test(navigator.platform);
+  var windows = /win/i.test(navigator.platform);
+
+  var presto_version = presto && navigator.userAgent.match(/Version\/(\d*\.\d*)/);
+  if (presto_version) presto_version = Number(presto_version[1]);
+  if (presto_version && presto_version >= 15) { presto = false; webkit = true; }
+  // Some browsers use the wrong event properties to signal cmd/ctrl on OS X
+  var flipCtrlCmd = mac && (qtwebkit || presto && (presto_version == null || presto_version < 12.11));
+  var captureRightClick = gecko || (ie && ie_version >= 9);
+
+  // Optimize some code when these features are not used.
+  var sawReadOnlySpans = false, sawCollapsedSpans = false;
+
+  // EDITOR CONSTRUCTOR
+
+  // A CodeMirror instance represents an editor. This is the object
+  // that user code is usually dealing with.
+
+  function CodeMirror(place, options) {
+    if (!(this instanceof CodeMirror)) return new CodeMirror(place, options);
+
+    this.options = options = options ? copyObj(options) : {};
+    // Determine effective options based on given values and defaults.
+    copyObj(defaults, options, false);
+    setGuttersForLineNumbers(options);
+
+    var doc = options.value;
+    if (typeof doc == "string") doc = new Doc(doc, options.mode, null, options.lineSeparator);
+    this.doc = doc;
+
+    var input = new CodeMirror.inputStyles[options.inputStyle](this);
+    var display = this.display = new Display(place, doc, input);
+    display.wrapper.CodeMirror = this;
+    updateGutters(this);
+    themeChanged(this);
+    if (options.lineWrapping)
+      this.display.wrapper.className += " CodeMirror-wrap";
+    if (options.autofocus && !mobile) display.input.focus();
+    initScrollbars(this);
+
+    this.state = {
+      keyMaps: [],  // stores maps added by addKeyMap
+      overlays: [], // highlighting overlays, as added by addOverlay
+      modeGen: 0,   // bumped when mode/overlay changes, used to invalidate highlighting info
+      overwrite: false,
+      delayingBlurEvent: false,
+      focused: false,
+      suppressEdits: false, // used to disable editing during key handlers when in readOnly mode
+      pasteIncoming: false, cutIncoming: false, // help recognize paste/cut edits in input.poll
+      selectingText: false,
+      draggingText: false,
+      highlight: new Delayed(), // stores highlight worker timeout
+      keySeq: null,  // Unfinished key sequence
+      specialChars: null
+    };
+
+    var cm = this;
+
+    // Override magic textarea content restore that IE sometimes does
+    // on our hidden textarea on reload
+    if (ie && ie_version < 11) setTimeout(function() { cm.display.input.reset(true); }, 20);
+
+    registerEventHandlers(this);
+    ensureGlobalHandlers();
+
+    startOperation(this);
+    this.curOp.forceUpdate = true;
+    attachDoc(this, doc);
+
+    if ((options.autofocus && !mobile) || cm.hasFocus())
+      setTimeout(bind(onFocus, this), 20);
+    else
+      onBlur(this);
+
+    for (var opt in optionHandlers) if (optionHandlers.hasOwnProperty(opt))
+      optionHandlers[opt](this, options[opt], Init);
+    maybeUpdateLineNumberWidth(this);
+    if (options.finishInit) options.finishInit(this);
+    for (var i = 0; i < initHooks.length; ++i) initHooks[i](this);
+    endOperation(this);
+    // Suppress optimizelegibility in Webkit, since it breaks text
+    // measuring on line wrapping boundaries.
+    if (webkit && options.lineWrapping &&
+        getComputedStyle(display.lineDiv).textRendering == "optimizelegibility")
+      display.lineDiv.style.textRendering = "auto";
+  }
+
+  // DISPLAY CONSTRUCTOR
+
+  // The display handles the DOM integration, both for input reading
+  // and content drawing. It holds references to DOM nodes and
+  // display-related state.
+
+  function Display(place, doc, input) {
+    var d = this;
+    this.input = input;
+
+    // Covers bottom-right square when both scrollbars are present.
+    d.scrollbarFiller = elt("div", null, "CodeMirror-scrollbar-filler");
+    d.scrollbarFiller.setAttribute("cm-not-content", "true");
+    // Covers bottom of gutter when coverGutterNextToScrollbar is on
+    // and h scrollbar is present.
+    d.gutterFiller = elt("div", null, "CodeMirror-gutter-filler");
+    d.gutterFiller.setAttribute("cm-not-content", "true");
+    // Will contain the actual code, positioned to cover the viewport.
+    d.lineDiv = elt("div", null, "CodeMirror-code");
+    // Elements are added to these to represent selection and cursors.
+    d.selectionDiv = elt("div", null, null, "position: relative; z-index: 1");
+    d.cursorDiv = elt("div", null, "CodeMirror-cursors");
+    // A visibility: hidden element used to find the size of things.
+    d.measure = elt("div", null, "CodeMirror-measure");
+    // When lines outside of the viewport are measured, they are drawn in this.
+    d.lineMeasure = elt("div", null, "CodeMirror-measure");
+    // Wraps everything that needs to exist inside the vertically-padded coordinate system
+    d.lineSpace = elt("div", [d.measure, d.lineMeasure, d.selectionDiv, d.cursorDiv, d.lineDiv],
+                      null, "position: relative; outline: none");
+    // Moved around its parent to cover visible view.
+    d.mover = elt("div", [elt("div", [d.lineSpace], "CodeMirror-lines")], null, "position: relative");
+    // Set to the height of the document, allowing scrolling.
+    d.sizer = elt("div", [d.mover], "CodeMirror-sizer");
+    d.sizerWidth = null;
+    // Behavior of elts with overflow: auto and padding is
+    // inconsistent across browsers. This is used to ensure the
+    // scrollable area is big enough.
+    d.heightForcer = elt("div", null, null, "position: absolute; height: " + scrollerGap + "px; width: 1px;");
+    // Will contain the gutters, if any.
+    d.gutters = elt("div", null, "CodeMirror-gutters");
+    d.lineGutter = null;
+    // Actual scrollable element.
+    d.scroller = elt("div", [d.sizer, d.heightForcer, d.gutters], "CodeMirror-scroll");
+    d.scroller.setAttribute("tabIndex", "-1");
+    // The element in which the editor lives.
+    d.wrapper = elt("div", [d.scrollbarFiller, d.gutterFiller, d.scroller], "CodeMirror");
+
+    // Work around IE7 z-index bug (not perfect, hence IE7 not really being supported)
+    if (ie && ie_version < 8) { d.gutters.style.zIndex = -1; d.scroller.style.paddingRight = 0; }
+    if (!webkit && !(gecko && mobile)) d.scroller.draggable = true;
+
+    if (place) {
+      if (place.appendChild) place.appendChild(d.wrapper);
+      else place(d.wrapper);
+    }
+
+    // Current rendered range (may be bigger than the view window).
+    d.viewFrom = d.viewTo = doc.first;
+    d.reportedViewFrom = d.reportedViewTo = doc.first;
+    // Information about the rendered lines.
+    d.view = [];
+    d.renderedView = null;
+    // Holds info about a single rendered line when it was rendered
+    // for measurement, while not in view.
+    d.externalMeasured = null;
+    // Empty space (in pixels) above the view
+    d.viewOffset = 0;
+    d.lastWrapHeight = d.lastWrapWidth = 0;
+    d.updateLineNumbers = null;
+
+    d.nativeBarWidth = d.barHeight = d.barWidth = 0;
+    d.scrollbarsClipped = false;
+
+    // Used to only resize the line number gutter when necessary (when
+    // the amount of lines crosses a boundary that makes its width change)
+    d.lineNumWidth = d.lineNumInnerWidth = d.lineNumChars = null;
+    // Set to true when a non-horizontal-scrolling line widget is
+    // added. As an optimization, line widget aligning is skipped when
+    // this is false.
+    d.alignWidgets = false;
+
+    d.cachedCharWidth = d.cachedTextHeight = d.cachedPaddingH = null;
+
+    // Tracks the maximum line length so that the horizontal scrollbar
+    // can be kept static when scrolling.
+    d.maxLine = null;
+    d.maxLineLength = 0;
+    d.maxLineChanged = false;
+
+    // Used for measuring wheel scrolling granularity
+    d.wheelDX = d.wheelDY = d.wheelStartX = d.wheelStartY = null;
+
+    // True when shift is held down.
+    d.shift = false;
+
+    // Used to track whether anything happened since the context menu
+    // was opened.
+    d.selForContextMenu = null;
+
+    d.activeTouch = null;
+
+    input.init(d);
+  }
+
+  // STATE UPDATES
+
+  // Used to get the editor into a consistent state again when options change.
+
+  function loadMode(cm) {
+    cm.doc.mode = CodeMirror.getMode(cm.options, cm.doc.modeOption);
+    resetModeState(cm);
+  }
+
+  function resetModeState(cm) {
+    cm.doc.iter(function(line) {
+      if (line.stateAfter) line.stateAfter = null;
+      if (line.styles) line.styles = null;
+    });
+    cm.doc.frontier = cm.doc.first;
+    startWorker(cm, 100);
+    cm.state.modeGen++;
+    if (cm.curOp) regChange(cm);
+  }
+
+  function wrappingChanged(cm) {
+    if (cm.options.lineWrapping) {
+      addClass(cm.display.wrapper, "CodeMirror-wrap");
+      cm.display.sizer.style.minWidth = "";
+      cm.display.sizerWidth = null;
+    } else {
+      rmClass(cm.display.wrapper, "CodeMirror-wrap");
+      findMaxLine(cm);
+    }
+    estimateLineHeights(cm);
+    regChange(cm);
+    clearCaches(cm);
+    setTimeout(function(){updateScrollbars(cm);}, 100);
+  }
+
+  // Returns a function that estimates the height of a line, to use as
+  // first approximation until the line becomes visible (and is thus
+  // properly measurable).
+  function estimateHeight(cm) {
+    var th = textHeight(cm.display), wrapping = cm.options.lineWrapping;
+    var perLine = wrapping && Math.max(5, cm.display.scroller.clientWidth / charWidth(cm.display) - 3);
+    return function(line) {
+      if (lineIsHidden(cm.doc, line)) return 0;
+
+      var widgetsHeight = 0;
+      if (line.widgets) for (var i = 0; i < line.widgets.length; i++) {
+        if (line.widgets[i].height) widgetsHeight += line.widgets[i].height;
+      }
+
+      if (wrapping)
+        return widgetsHeight + (Math.ceil(line.text.length / perLine) || 1) * th;
+      else
+        return widgetsHeight + th;
+    };
+  }
+
+  function estimateLineHeights(cm) {
+    var doc = cm.doc, est = estimateHeight(cm);
+    doc.iter(function(line) {
+      var estHeight = est(line);
+      if (estHeight != line.height) updateLineHeight(line, estHeight);
+    });
+  }
+
+  function themeChanged(cm) {
+    cm.display.wrapper.className = cm.display.wrapper.className.replace(/\s*cm-s-\S+/g, "") +
+      cm.options.theme.replace(/(^|\s)\s*/g, " cm-s-");
+    clearCaches(cm);
+  }
+
+  function guttersChanged(cm) {
+    updateGutters(cm);
+    regChange(cm);
+    setTimeout(function(){alignHorizontally(cm);}, 20);
+  }
+
+  // Rebuild the gutter elements, ensure the margin to the left of the
+  // code matches their width.
+  function updateGutters(cm) {
+    var gutters = cm.display.gutters, specs = cm.options.gutters;
+    removeChildren(gutters);
+    for (var i = 0; i < specs.length; ++i) {
+      var gutterClass = specs[i];
+      var gElt = gutters.appendChild(elt("div", null, "CodeMirror-gutter " + gutterClass));
+      if (gutterClass == "CodeMirror-linenumbers") {
+        cm.display.lineGutter = gElt;
+        gElt.style.width = (cm.display.lineNumWidth || 1) + "px";
+      }
+    }
+    gutters.style.display = i ? "" : "none";
+    updateGutterSpace(cm);
+  }
+
+  function updateGutterSpace(cm) {
+    var width = cm.display.gutters.offsetWidth;
+    cm.display.sizer.style.marginLeft = width + "px";
+  }
+
+  // Compute the character length of a line, taking into account
+  // collapsed ranges (see markText) that might hide parts, and join
+  // other lines onto it.
+  function lineLength(line) {
+    if (line.height == 0) return 0;
+    var len = line.text.length, merged, cur = line;
+    while (merged = collapsedSpanAtStart(cur)) {
+      var found = merged.find(0, true);
+      cur = found.from.line;
+      len += found.from.ch - found.to.ch;
+    }
+    cur = line;
+    while (merged = collapsedSpanAtEnd(cur)) {
+      var found = merged.find(0, true);
+      len -= cur.text.length - found.from.ch;
+      cur = found.to.line;
+      len += cur.text.length - found.to.ch;
+    }
+    return len;
+  }
+
+  // Find the longest line in the document.
+  function findMaxLine(cm) {
+    var d = cm.display, doc = cm.doc;
+    d.maxLine = getLine(doc, doc.first);
+    d.maxLineLength = lineLength(d.maxLine);
+    d.maxLineChanged = true;
+    doc.iter(function(line) {
+      var len = lineLength(line);
+      if (len > d.maxLineLength) {
+        d.maxLineLength = len;
+        d.maxLine = line;
+      }
+    });
+  }
+
+  // Make sure the gutters options contains the element
+  // "CodeMirror-linenumbers" when the lineNumbers option is true.
+  function setGuttersForLineNumbers(options) {
+    var found = indexOf(options.gutters, "CodeMirror-linenumbers");
+    if (found == -1 && options.lineNumbers) {
+      options.gutters = options.gutters.concat(["CodeMirror-linenumbers"]);
+    } else if (found > -1 && !options.lineNumbers) {
+      options.gutters = options.gutters.slice(0);
+      options.gutters.splice(found, 1);
+    }
+  }
+
+  // SCROLLBARS
+
+  // Prepare DOM reads needed to update the scrollbars. Done in one
+  // shot to minimize update/measure roundtrips.
+  function measureForScrollbars(cm) {
+    var d = cm.display, gutterW = d.gutters.offsetWidth;
+    var docH = Math.round(cm.doc.height + paddingVert(cm.display));
+    return {
+      clientHeight: d.scroller.clientHeight,
+      viewHeight: d.wrapper.clientHeight,
+      scrollWidth: d.scroller.scrollWidth, clientWidth: d.scroller.clientWidth,
+      viewWidth: d.wrapper.clientWidth,
+      barLeft: cm.options.fixedGutter ? gutterW : 0,
+      docHeight: docH,
+      scrollHeight: docH + scrollGap(cm) + d.barHeight,
+      nativeBarWidth: d.nativeBarWidth,
+      gutterWidth: gutterW
+    };
+  }
+
+  function NativeScrollbars(place, scroll, cm) {
+    this.cm = cm;
+    var vert = this.vert = elt("div", [elt("div", null, null, "min-width: 1px")], "CodeMirror-vscrollbar");
+    var horiz = this.horiz = elt("div", [elt("div", null, null, "height: 100%; min-height: 1px")], "CodeMirror-hscrollbar");
+    place(vert); place(horiz);
+
+    on(vert, "scroll", function() {
+      if (vert.clientHeight) scroll(vert.scrollTop, "vertical");
+    });
+    on(horiz, "scroll", function() {
+      if (horiz.clientWidth) scroll(horiz.scrollLeft, "horizontal");
+    });
+
+    this.checkedOverlay = false;
+    // Need to set a minimum width to see the scrollbar on IE7 (but must not set it on IE8).
+    if (ie && ie_version < 8) this.horiz.style.minHeight = this.vert.style.minWidth = "18px";
+  }
+
+  NativeScrollbars.prototype = copyObj({
+    update: function(measure) {
+      var needsH = measure.scrollWidth > measure.clientWidth + 1;
+      var needsV = measure.scrollHeight > measure.clientHeight + 1;
+      var sWidth = measure.nativeBarWidth;
+
+      if (needsV) {
+        this.vert.style.display = "block";
+        this.vert.style.bottom = needsH ? sWidth + "px" : "0";
+        var totalHeight = measure.viewHeight - (needsH ? sWidth : 0);
+        // A bug in IE8 can cause this value to be negative, so guard it.
+        this.vert.firstChild.style.height =
+          Math.max(0, measure.scrollHeight - measure.clientHeight + totalHeight) + "px";
+      } else {
+        this.vert.style.display = "";
+        this.vert.firstChild.style.height = "0";
+      }
+
+      if (needsH) {
+        this.horiz.style.display = "block";
+        this.horiz.style.right = needsV ? sWidth + "px" : "0";
+        this.horiz.style.left = measure.barLeft + "px";
+        var totalWidth = measure.viewWidth - measure.barLeft - (needsV ? sWidth : 0);
+        this.horiz.firstChild.style.width =
+          (measure.scrollWidth - measure.clientWidth + totalWidth) + "px";
+      } else {
+        this.horiz.style.display = "";
+        this.horiz.firstChild.style.width = "0";
+      }
+
+      if (!this.checkedOverlay && measure.clientHeight > 0) {
+        if (sWidth == 0) this.overlayHack();
+        this.checkedOverlay = true;
+      }
+
+      return {right: needsV ? sWidth : 0, bottom: needsH ? sWidth : 0};
+    },
+    setScrollLeft: function(pos) {
+      if (this.horiz.scrollLeft != pos) this.horiz.scrollLeft = pos;
+    },
+    setScrollTop: function(pos) {
+      if (this.vert.scrollTop != pos) this.vert.scrollTop = pos;
+    },
+    overlayHack: function() {
+      var w = mac && !mac_geMountainLion ? "12px" : "18px";
+      this.horiz.style.minHeight = this.vert.style.minWidth = w;
+      var self = this;
+      var barMouseDown = function(e) {
+        if (e_target(e) != self.vert && e_target(e) != self.horiz)
+          operation(self.cm, onMouseDown)(e);
+      };
+      on(this.vert, "mousedown", barMouseDown);
+      on(this.horiz, "mousedown", barMouseDown);
+    },
+    clear: function() {
+      var parent = this.horiz.parentNode;
+      parent.removeChild(this.horiz);
+      parent.removeChild(this.vert);
+    }
+  }, NativeScrollbars.prototype);
+
+  function NullScrollbars() {}
+
+  NullScrollbars.prototype = copyObj({
+    update: function() { return {bottom: 0, right: 0}; },
+    setScrollLeft: function() {},
+    setScrollTop: function() {},
+    clear: function() {}
+  }, NullScrollbars.prototype);
+
+  CodeMirror.scrollbarModel = {"native": NativeScrollbars, "null": NullScrollbars};
+
+  function initScrollbars(cm) {
+    if (cm.display.scrollbars) {
+      cm.display.scrollbars.clear();
+      if (cm.display.scrollbars.addClass)
+        rmClass(cm.display.wrapper, cm.display.scrollbars.addClass);
+    }
+
+    cm.display.scrollbars = new CodeMirror.scrollbarModel[cm.options.scrollbarStyle](function(node) {
+      cm.display.wrapper.insertBefore(node, cm.display.scrollbarFiller);
+      // Prevent clicks in the scrollbars from killing focus
+      on(node, "mousedown", function() {
+        if (cm.state.focused) setTimeout(function() { cm.display.input.focus(); }, 0);
+      });
+      node.setAttribute("cm-not-content", "true");
+    }, function(pos, axis) {
+      if (axis == "horizontal") setScrollLeft(cm, pos);
+      else setScrollTop(cm, pos);
+    }, cm);
+    if (cm.display.scrollbars.addClass)
+      addClass(cm.display.wrapper, cm.display.scrollbars.addClass);
+  }
+
+  function updateScrollbars(cm, measure) {
+    if (!measure) measure = measureForScrollbars(cm);
+    var startWidth = cm.display.barWidth, startHeight = cm.display.barHeight;
+    updateScrollbarsInner(cm, measure);
+    for (var i = 0; i < 4 && startWidth != cm.display.barWidth || startHeight != cm.display.barHeight; i++) {
+      if (startWidth != cm.display.barWidth && cm.options.lineWrapping)
+        updateHeightsInViewport(cm);
+      updateScrollbarsInner(cm, measureForScrollbars(cm));
+      startWidth = cm.display.barWidth; startHeight = cm.display.barHeight;
+    }
+  }
+
+  // Re-synchronize the fake scrollbars with the actual size of the
+  // content.
+  function updateScrollbarsInner(cm, measure) {
+    var d = cm.display;
+    var sizes = d.scrollbars.update(measure);
+
+    d.sizer.style.paddingRight = (d.barWidth = sizes.right) + "px";
+    d.sizer.style.paddingBottom = (d.barHeight = sizes.bottom) + "px";
+
+    if (sizes.right && sizes.bottom) {
+      d.scrollbarFiller.style.display = "block";
+      d.scrollbarFiller.style.height = sizes.bottom + "px";
+      d.scrollbarFiller.style.width = sizes.right + "px";
+    } else d.scrollbarFiller.style.display = "";
+    if (sizes.bottom && cm.options.coverGutterNextToScrollbar && cm.options.fixedGutter) {
+      d.gutterFiller.style.display = "block";
+      d.gutterFiller.style.height = sizes.bottom + "px";
+      d.gutterFiller.style.width = measure.gutterWidth + "px";
+    } else d.gutterFiller.style.display = "";
+  }
+
+  // Compute the lines that are visible in a given viewport (defaults
+  // the the current scroll position). viewport may contain top,
+  // height, and ensure (see op.scrollToPos) properties.
+  function visibleLines(display, doc, viewport) {
+    var top = viewport && viewport.top != null ? Math.max(0, viewport.top) : display.scroller.scrollTop;
+    top = Math.floor(top - paddingTop(display));
+    var bottom = viewport && viewport.bottom != null ? viewport.bottom : top + display.wrapper.clientHeight;
+
+    var from = lineAtHeight(doc, top), to = lineAtHeight(doc, bottom);
+    // Ensure is a {from: {line, ch}, to: {line, ch}} object, and
+    // forces those lines into the viewport (if possible).
+    if (viewport && viewport.ensure) {
+      var ensureFrom = viewport.ensure.from.line, ensureTo = viewport.ensure.to.line;
+      if (ensureFrom < from) {
+        from = ensureFrom;
+        to = lineAtHeight(doc, heightAtLine(getLine(doc, ensureFrom)) + display.wrapper.clientHeight);
+      } else if (Math.min(ensureTo, doc.lastLine()) >= to) {
+        from = lineAtHeight(doc, heightAtLine(getLine(doc, ensureTo)) - display.wrapper.clientHeight);
+        to = ensureTo;
+      }
+    }
+    return {from: from, to: Math.max(to, from + 1)};
+  }
+
+  // LINE NUMBERS
+
+  // Re-align line numbers and gutter marks to compensate for
+  // horizontal scrolling.
+  function alignHorizontally(cm) {
+    var display = cm.display, view = display.view;
+    if (!display.alignWidgets && (!display.gutters.firstChild || !cm.options.fixedGutter)) return;
+    var comp = compensateForHScroll(display) - display.scroller.scrollLeft + cm.doc.scrollLeft;
+    var gutterW = display.gutters.offsetWidth, left = comp + "px";
+    for (var i = 0; i < view.length; i++) if (!view[i].hidden) {
+      if (cm.options.fixedGutter && view[i].gutter)
+        view[i].gutter.style.left = left;
+      var align = view[i].alignable;
+      if (align) for (var j = 0; j < align.length; j++)
+        align[j].style.left = left;
+    }
+    if (cm.options.fixedGutter)
+      display.gutters.style.left = (comp + gutterW) + "px";
+  }
+
+  // Used to ensure that the line number gutter is still the right
+  // size for the current document size. Returns true when an update
+  // is needed.
+  function maybeUpdateLineNumberWidth(cm) {
+    if (!cm.options.lineNumbers) return false;
+    var doc = cm.doc, last = lineNumberFor(cm.options, doc.first + doc.size - 1), display = cm.display;
+    if (last.length != display.lineNumChars) {
+      var test = display.measure.appendChild(elt("div", [elt("div", last)],
+                                                 "CodeMirror-linenumber CodeMirror-gutter-elt"));
+      var innerW = test.firstChild.offsetWidth, padding = test.offsetWidth - innerW;
+      display.lineGutter.style.width = "";
+      display.lineNumInnerWidth = Math.max(innerW, display.lineGutter.offsetWidth - padding) + 1;
+      display.lineNumWidth = display.lineNumInnerWidth + padding;
+      display.lineNumChars = display.lineNumInnerWidth ? last.length : -1;
+      display.lineGutter.style.width = display.lineNumWidth + "px";
+      updateGutterSpace(cm);
+      return true;
+    }
+    return false;
+  }
+
+  function lineNumberFor(options, i) {
+    return String(options.lineNumberFormatter(i + options.firstLineNumber));
+  }
+
+  // Computes display.scroller.scrollLeft + display.gutters.offsetWidth,
+  // but using getBoundingClientRect to get a sub-pixel-accurate
+  // result.
+  function compensateForHScroll(display) {
+    return display.scroller.getBoundingClientRect().left - display.sizer.getBoundingClientRect().left;
+  }
+
+  // DISPLAY DRAWING
+
+  function DisplayUpdate(cm, viewport, force) {
+    var display = cm.display;
+
+    this.viewport = viewport;
+    // Store some values that we'll need later (but don't want to force a relayout for)
+    this.visible = visibleLines(display, cm.doc, viewport);
+    this.editorIsHidden = !display.wrapper.offsetWidth;
+    this.wrapperHeight = display.wrapper.clientHeight;
+    this.wrapperWidth = display.wrapper.clientWidth;
+    this.oldDisplayWidth = displayWidth(cm);
+    this.force = force;
+    this.dims = getDimensions(cm);
+    this.events = [];
+  }
+
+  DisplayUpdate.prototype.signal = function(emitter, type) {
+    if (hasHandler(emitter, type))
+      this.events.push(arguments);
+  };
+  DisplayUpdate.prototype.finish = function() {
+    for (var i = 0; i < this.events.length; i++)
+      signal.apply(null, this.events[i]);
+  };
+
+  function maybeClipScrollbars(cm) {
+    var display = cm.display;
+    if (!display.scrollbarsClipped && display.scroller.offsetWidth) {
+      display.nativeBarWidth = display.scroller.offsetWidth - display.scroller.clientWidth;
+      display.heightForcer.style.height = scrollGap(cm) + "px";
+      display.sizer.style.marginBottom = -display.nativeBarWidth + "px";
+      display.sizer.style.borderRightWidth = scrollGap(cm) + "px";
+      display.scrollbarsClipped = true;
+    }
+  }
+
+  // Does the actual updating of the line display. Bails out
+  // (returning false) when there is nothing to be done and forced is
+  // false.
+  function updateDisplayIfNeeded(cm, update) {
+    var display = cm.display, doc = cm.doc;
+
+    if (update.editorIsHidden) {
+      resetView(cm);
+      return false;
+    }
+
+    // Bail out if the visible area is already rendered and nothing changed.
+    if (!update.force &&
+        update.visible.from >= display.viewFrom && update.visible.to <= display.viewTo &&
+        (display.updateLineNumbers == null || display.updateLineNumbers >= display.viewTo) &&
+        display.renderedView == display.view && countDirtyView(cm) == 0)
+      return false;
+
+    if (maybeUpdateLineNumberWidth(cm)) {
+      resetView(cm);
+      update.dims = getDimensions(cm);
+    }
+
+    // Compute a suitable new viewport (from & to)
+    var end = doc.first + doc.size;
+    var from = Math.max(update.visible.from - cm.options.viewportMargin, doc.first);
+    var to = Math.min(end, update.visible.to + cm.options.viewportMargin);
+    if (display.viewFrom < from && from - display.viewFrom < 20) from = Math.max(doc.first, display.viewFrom);
+    if (display.viewTo > to && display.viewTo - to < 20) to = Math.min(end, display.viewTo);
+    if (sawCollapsedSpans) {
+      from = visualLineNo(cm.doc, from);
+      to = visualLineEndNo(cm.doc, to);
+    }
+
+    var different = from != display.viewFrom || to != display.viewTo ||
+      display.lastWrapHeight != update.wrapperHeight || display.lastWrapWidth != update.wrapperWidth;
+    adjustView(cm, from, to);
+
+    display.viewOffset = heightAtLine(getLine(cm.doc, display.viewFrom));
+    // Position the mover div to align with the current scroll position
+    cm.display.mover.style.top = display.viewOffset + "px";
+
+    var toUpdate = countDirtyView(cm);
+    if (!different && toUpdate == 0 && !update.force && display.renderedView == display.view &&
+        (display.updateLineNumbers == null || display.updateLineNumbers >= display.viewTo))
+      return false;
+
+    // For big changes, we hide the enclosing element during the
+    // update, since that speeds up the operations on most browsers.
+    var focused = activeElt();
+    if (toUpdate > 4) display.lineDiv.style.display = "none";
+    patchDisplay(cm, display.updateLineNumbers, update.dims);
+    if (toUpdate > 4) display.lineDiv.style.display = "";
+    display.renderedView = display.view;
+    // There might have been a widget with a focused element that got
+    // hidden or updated, if so re-focus it.
+    if (focused && activeElt() != focused && focused.offsetHeight) focused.focus();
+
+    // Prevent selection and cursors from interfering with the scroll
+    // width and height.
+    removeChildren(display.cursorDiv);
+    removeChildren(display.selectionDiv);
+    display.gutters.style.height = display.sizer.style.minHeight = 0;
+
+    if (different) {
+      display.lastWrapHeight = update.wrapperHeight;
+      display.lastWrapWidth = update.wrapperWidth;
+      startWorker(cm, 400);
+    }
+
+    display.updateLineNumbers = null;
+
+    return true;
+  }
+
+  function postUpdateDisplay(cm, update) {
+    var viewport = update.viewport;
+    for (var first = true;; first = false) {
+      if (!first || !cm.options.lineWrapping || update.oldDisplayWidth == displayWidth(cm)) {
+        // Clip forced viewport to actual scrollable area.
+        if (viewport && viewport.top != null)
+          viewport = {top: Math.min(cm.doc.height + paddingVert(cm.display) - displayHeight(cm), viewport.top)};
+        // Updated line heights might result in the drawn area not
+        // actually covering the viewport. Keep looping until it does.
+        update.visible = visibleLines(cm.display, cm.doc, viewport);
+        if (update.visible.from >= cm.display.viewFrom && update.visible.to <= cm.display.viewTo)
+          break;
+      }
+      if (!updateDisplayIfNeeded(cm, update)) break;
+      updateHeightsInViewport(cm);
+      var barMeasure = measureForScrollbars(cm);
+      updateSelection(cm);
+      setDocumentHeight(cm, barMeasure);
+      updateScrollbars(cm, barMeasure);
+    }
+
+    update.signal(cm, "update", cm);
+    if (cm.display.viewFrom != cm.display.reportedViewFrom || cm.display.viewTo != cm.display.reportedViewTo) {
+      update.signal(cm, "viewportChange", cm, cm.display.viewFrom, cm.display.viewTo);
+      cm.display.reportedViewFrom = cm.display.viewFrom; cm.display.reportedViewTo = cm.display.viewTo;
+    }
+  }
+
+  function updateDisplaySimple(cm, viewport) {
+    var update = new DisplayUpdate(cm, viewport);
+    if (updateDisplayIfNeeded(cm, update)) {
+      updateHeightsInViewport(cm);
+      postUpdateDisplay(cm, update);
+      var barMeasure = measureForScrollbars(cm);
+      updateSelection(cm);
+      setDocumentHeight(cm, barMeasure);
+      updateScrollbars(cm, barMeasure);
+      update.finish();
+    }
+  }
+
+  function setDocumentHeight(cm, measure) {
+    cm.display.sizer.style.minHeight = measure.docHeight + "px";
+    var total = measure.docHeight + cm.display.barHeight;
+    cm.display.heightForcer.style.top = total + "px";
+    cm.display.gutters.style.height = Math.max(total + scrollGap(cm), measure.clientHeight) + "px";
+  }
+
+  // Read the actual heights of the rendered lines, and update their
+  // stored heights to match.
+  function updateHeightsInViewport(cm) {
+    var display = cm.display;
+    var prevBottom = display.lineDiv.offsetTop;
+    for (var i = 0; i < display.view.length; i++) {
+      var cur = display.view[i], height;
+      if (cur.hidden) continue;
+      if (ie && ie_version < 8) {
+        var bot = cur.node.offsetTop + cur.node.offsetHeight;
+        height = bot - prevBottom;
+        prevBottom = bot;
+      } else {
+        var box = cur.node.getBoundingClientRect();
+        height = box.bottom - box.top;
+      }
+      var diff = cur.line.height - height;
+      if (height < 2) height = textHeight(display);
+      if (diff > .001 || diff < -.001) {
+        updateLineHeight(cur.line, height);
+        updateWidgetHeight(cur.line);
+        if (cur.rest) for (var j = 0; j < cur.rest.length; j++)
+          updateWidgetHeight(cur.rest[j]);
+      }
+    }
+  }
+
+  // Read and store the height of line widgets associated with the
+  // given line.
+  function updateWidgetHeight(line) {
+    if (line.widgets) for (var i = 0; i < line.widgets.length; ++i)
+      line.widgets[i].height = line.widgets[i].node.offsetHeight;
+  }
+
+  // Do a bulk-read of the DOM positions and sizes needed to draw the
+  // view, so that we don't interleave reading and writing to the DOM.
+  function getDimensions(cm) {
+    var d = cm.display, left = {}, width = {};
+    var gutterLeft = d.gutters.clientLeft;
+    for (var n = d.gutters.firstChild, i = 0; n; n = n.nextSibling, ++i) {
+      left[cm.options.gutters[i]] = n.offsetLeft + n.clientLeft + gutterLeft;
+      width[cm.options.gutters[i]] = n.clientWidth;
+    }
+    return {fixedPos: compensateForHScroll(d),
+            gutterTotalWidth: d.gutters.offsetWidth,
+            gutterLeft: left,
+            gutterWidth: width,
+            wrapperWidth: d.wrapper.clientWidth};
+  }
+
+  // Sync the actual display DOM structure with display.view, removing
+  // nodes for lines that are no longer in view, and creating the ones
+  // that are not there yet, and updating the ones that are out of
+  // date.
+  function patchDisplay(cm, updateNumbersFrom, dims) {
+    var display = cm.display, lineNumbers = cm.options.lineNumbers;
+    var container = display.lineDiv, cur = container.firstChild;
+
+    function rm(node) {
+      var next = node.nextSibling;
+      // Works around a throw-scroll bug in OS X Webkit
+      if (webkit && mac && cm.display.currentWheelTarget == node)
+        node.style.display = "none";
+      else
+        node.parentNode.removeChild(node);
+      return next;
+    }
+
+    var view = display.view, lineN = display.viewFrom;
+    // Loop over the elements in the view, syncing cur (the DOM nodes
+    // in display.lineDiv) with the view as we go.
+    for (var i = 0; i < view.length; i++) {
+      var lineView = view[i];
+      if (lineView.hidden) {
+      } else if (!lineView.node || lineView.node.parentNode != container) { // Not drawn yet
+        var node = buildLineElement(cm, lineView, lineN, dims);
+        container.insertBefore(node, cur);
+      } else { // Already drawn
+        while (cur != lineView.node) cur = rm(cur);
+        var updateNumber = lineNumbers && updateNumbersFrom != null &&
+          updateNumbersFrom <= lineN && lineView.lineNumber;
+        if (lineView.changes) {
+          if (indexOf(lineView.changes, "gutter") > -1) updateNumber = false;
+          updateLineForChanges(cm, lineView, lineN, dims);
+        }
+        if (updateNumber) {
+          removeChildren(lineView.lineNumber);
+          lineView.lineNumber.appendChild(document.createTextNode(lineNumberFor(cm.options, lineN)));
+        }
+        cur = lineView.node.nextSibling;
+      }
+      lineN += lineView.size;
+    }
+    while (cur) cur = rm(cur);
+  }
+
+  // When an aspect of a line changes, a string is added to
+  // lineView.changes. This updates the relevant part of the line's
+  // DOM structure.
+  function updateLineForChanges(cm, lineView, lineN, dims) {
+    for (var j = 0; j < lineView.changes.length; j++) {
+      var type = lineView.changes[j];
+      if (type == "text") updateLineText(cm, lineView);
+      else if (type == "gutter") updateLineGutter(cm, lineView, lineN, dims);
+      else if (type == "class") updateLineClasses(lineView);
+      else if (type == "widget") updateLineWidgets(cm, lineView, dims);
+    }
+    lineView.changes = null;
+  }
+
+  // Lines with gutter elements, widgets or a background class need to
+  // be wrapped, and have the extra elements added to the wrapper div
+  function ensureLineWrapped(lineView) {
+    if (lineView.node == lineView.text) {
+      lineView.node = elt("div", null, null, "position: relative");
+      if (lineView.text.parentNode)
+        lineView.text.parentNode.replaceChild(lineView.node, lineView.text);
+      lineView.node.appendChild(lineView.text);
+      if (ie && ie_version < 8) lineView.node.style.zIndex = 2;
+    }
+    return lineView.node;
+  }
+
+  function updateLineBackground(lineView) {
+    var cls = lineView.bgClass ? lineView.bgClass + " " + (lineView.line.bgClass || "") : lineView.line.bgClass;
+    if (cls) cls += " CodeMirror-linebackground";
+    if (lineView.background) {
+      if (cls) lineView.background.className = cls;
+      else { lineView.background.parentNode.removeChild(lineView.background); lineView.background = null; }
+    } else if (cls) {
+      var wrap = ensureLineWrapped(lineView);
+      lineView.background = wrap.insertBefore(elt("div", null, cls), wrap.firstChild);
+    }
+  }
+
+  // Wrapper around buildLineContent which will reuse the structure
+  // in display.externalMeasured when possible.
+  function getLineContent(cm, lineView) {
+    var ext = cm.display.externalMeasured;
+    if (ext && ext.line == lineView.line) {
+      cm.display.externalMeasured = null;
+      lineView.measure = ext.measure;
+      return ext.built;
+    }
+    return buildLineContent(cm, lineView);
+  }
+
+  // Redraw the line's text. Interacts with the background and text
+  // classes because the mode may output tokens that influence these
+  // classes.
+  function updateLineText(cm, lineView) {
+    var cls = lineView.text.className;
+    var built = getLineContent(cm, lineView);
+    if (lineView.text == lineView.node) lineView.node = built.pre;
+    lineView.text.parentNode.replaceChild(built.pre, lineView.text);
+    lineView.text = built.pre;
+    if (built.bgClass != lineView.bgClass || built.textClass != lineView.textClass) {
+      lineView.bgClass = built.bgClass;
+      lineView.textClass = built.textClass;
+      updateLineClasses(lineView);
+    } else if (cls) {
+      lineView.text.className = cls;
+    }
+  }
+
+  function updateLineClasses(lineView) {
+    updateLineBackground(lineView);
+    if (lineView.line.wrapClass)
+      ensureLineWrapped(lineView).className = lineView.line.wrapClass;
+    else if (lineView.node != lineView.text)
+      lineView.node.className = "";
+    var textClass = lineView.textClass ? lineView.textClass + " " + (lineView.line.textClass || "") : lineView.line.textClass;
+    lineView.text.className = textClass || "";
+  }
+
+  function updateLineGutter(cm, lineView, lineN, dims) {
+    if (lineView.gutter) {
+      lineView.node.removeChild(lineView.gutter);
+      lineView.gutter = null;
+    }
+    if (lineView.gutterBackground) {
+      lineView.node.removeChild(lineView.gutterBackground);
+      lineView.gutterBackground = null;
+    }
+    if (lineView.line.gutterClass) {
+      var wrap = ensureLineWrapped(lineView);
+      lineView.gutterBackground = elt("div", null, "CodeMirror-gutter-background " + lineView.line.gutterClass,
+                                      "left: " + (cm.options.fixedGutter ? dims.fixedPos : -dims.gutterTotalWidth) +
+                                      "px; width: " + dims.gutterTotalWidth + "px");
+      wrap.insertBefore(lineView.gutterBackground, lineView.text);
+    }
+    var markers = lineView.line.gutterMarkers;
+    if (cm.options.lineNumbers || markers) {
+      var wrap = ensureLineWrapped(lineView);
+      var gutterWrap = lineView.gutter = elt("div", null, "CodeMirror-gutter-wrapper", "left: " +
+                                             (cm.options.fixedGutter ? dims.fixedPos : -dims.gutterTotalWidth) + "px");
+      cm.display.input.setUneditable(gutterWrap);
+      wrap.insertBefore(gutterWrap, lineView.text);
+      if (lineView.line.gutterClass)
+        gutterWrap.className += " " + lineView.line.gutterClass;
+      if (cm.options.lineNumbers && (!markers || !markers["CodeMirror-linenumbers"]))
+        lineView.lineNumber = gutterWrap.appendChild(
+          elt("div", lineNumberFor(cm.options, lineN),
+              "CodeMirror-linenumber CodeMirror-gutter-elt",
+              "left: " + dims.gutterLeft["CodeMirror-linenumbers"] + "px; width: "
+              + cm.display.lineNumInnerWidth + "px"));
+      if (markers) for (var k = 0; k < cm.options.gutters.length; ++k) {
+        var id = cm.options.gutters[k], found = markers.hasOwnProperty(id) && markers[id];
+        if (found)
+          gutterWrap.appendChild(elt("div", [found], "CodeMirror-gutter-elt", "left: " +
+                                     dims.gutterLeft[id] + "px; width: " + dims.gutterWidth[id] + "px"));
+      }
+    }
+  }
+
+  function updateLineWidgets(cm, lineView, dims) {
+    if (lineView.alignable) lineView.alignable = null;
+    for (var node = lineView.node.firstChild, next; node; node = next) {
+      var next = node.nextSibling;
+      if (node.className == "CodeMirror-linewidget")
+        lineView.node.removeChild(node);
+    }
+    insertLineWidgets(cm, lineView, dims);
+  }
+
+  // Build a line's DOM representation from scratch
+  function buildLineElement(cm, lineView, lineN, dims) {
+    var built = getLineContent(cm, lineView);
+    lineView.text = lineView.node = built.pre;
+    if (built.bgClass) lineView.bgClass = built.bgClass;
+    if (built.textClass) lineView.textClass = built.textClass;
+
+    updateLineClasses(lineView);
+    updateLineGutter(cm, lineView, lineN, dims);
+    insertLineWidgets(cm, lineView, dims);
+    return lineView.node;
+  }
+
+  // A lineView may contain multiple logical lines (when merged by
+  // collapsed spans). The widgets for all of them need to be drawn.
+  function insertLineWidgets(cm, lineView, dims) {
+    insertLineWidgetsFor(cm, lineView.line, lineView, dims, true);
+    if (lineView.rest) for (var i = 0; i < lineView.rest.length; i++)
+      insertLineWidgetsFor(cm, lineView.rest[i], lineView, dims, false);
+  }
+
+  function insertLineWidgetsFor(cm, line, lineView, dims, allowAbove) {
+    if (!line.widgets) return;
+    var wrap = ensureLineWrapped(lineView);
+    for (var i = 0, ws = line.widgets; i < ws.length; ++i) {
+      var widget = ws[i], node = elt("div", [widget.node], "CodeMirror-linewidget");
+      if (!widget.handleMouseEvents) node.setAttribute("cm-ignore-events", "true");
+      positionLineWidget(widget, node, lineView, dims);
+      cm.display.input.setUneditable(node);
+      if (allowAbove && widget.above)
+        wrap.insertBefore(node, lineView.gutter || lineView.text);
+      else
+        wrap.appendChild(node);
+      signalLater(widget, "redraw");
+    }
+  }
+
+  function positionLineWidget(widget, node, lineView, dims) {
+    if (widget.noHScroll) {
+      (lineView.alignable || (lineView.alignable = [])).push(node);
+      var width = dims.wrapperWidth;
+      node.style.left = dims.fixedPos + "px";
+      if (!widget.coverGutter) {
+        width -= dims.gutterTotalWidth;
+        node.style.paddingLeft = dims.gutterTotalWidth + "px";
+      }
+      node.style.width = width + "px";
+    }
+    if (widget.coverGutter) {
+      node.style.zIndex = 5;
+      node.style.position = "relative";
+      if (!widget.noHScroll) node.style.marginLeft = -dims.gutterTotalWidth + "px";
+    }
+  }
+
+  // POSITION OBJECT
+
+  // A Pos instance represents a position within the text.
+  var Pos = CodeMirror.Pos = function(line, ch) {
+    if (!(this instanceof Pos)) return new Pos(line, ch);
+    this.line = line; this.ch = ch;
+  };
+
+  // Compare two positions, return 0 if they are the same, a negative
+  // number when a is less, and a positive number otherwise.
+  var cmp = CodeMirror.cmpPos = function(a, b) { return a.line - b.line || a.ch - b.ch; };
+
+  function copyPos(x) {return Pos(x.line, x.ch);}
+  function maxPos(a, b) { return cmp(a, b) < 0 ? b : a; }
+  function minPos(a, b) { return cmp(a, b) < 0 ? a : b; }
+
+  // INPUT HANDLING
+
+  function ensureFocus(cm) {
+    if (!cm.state.focused) { cm.display.input.focus(); onFocus(cm); }
+  }
+
+  function isReadOnly(cm) {
+    return cm.options.readOnly || cm.doc.cantEdit;
+  }
+
+  // This will be set to an array of strings when copying, so that,
+  // when pasting, we know what kind of selections the copied text
+  // was made out of.
+  var lastCopied = null;
+
+  function applyTextInput(cm, inserted, deleted, sel, origin) {
+    var doc = cm.doc;
+    cm.display.shift = false;
+    if (!sel) sel = doc.sel;
+
+    var paste = cm.state.pasteIncoming || origin == "paste";
+    var textLines = doc.splitLines(inserted), multiPaste = null;
+    // When pasing N lines into N selections, insert one line per selection
+    if (paste && sel.ranges.length > 1) {
+      if (lastCopied && lastCopied.join("\n") == inserted) {
+        if (sel.ranges.length % lastCopied.length == 0) {
+          multiPaste = [];
+          for (var i = 0; i < lastCopied.length; i++)
+            multiPaste.push(doc.splitLines(lastCopied[i]));
+        }
+      } else if (textLines.length == sel.ranges.length) {
+        multiPaste = map(textLines, function(l) { return [l]; });
+      }
+    }
+
+    // Normal behavior is to insert the new text into every selection
+    for (var i = sel.ranges.length - 1; i >= 0; i--) {
+      var range = sel.ranges[i];
+      var from = range.from(), to = range.to();
+      if (range.empty()) {
+        if (deleted && deleted > 0) // Handle deletion
+          from = Pos(from.line, from.ch - deleted);
+        else if (cm.state.overwrite && !paste) // Handle overwrite
+          to = Pos(to.line, Math.min(getLine(doc, to.line).text.length, to.ch + lst(textLines).length));
+      }
+      var updateInput = cm.curOp.updateInput;
+      var changeEvent = {from: from, to: to, text: multiPaste ? multiPaste[i % multiPaste.length] : textLines,
+                         origin: origin || (paste ? "paste" : cm.state.cutIncoming ? "cut" : "+input")};
+      makeChange(cm.doc, changeEvent);
+      signalLater(cm, "inputRead", cm, changeEvent);
+    }
+    if (inserted && !paste)
+      triggerElectric(cm, inserted);
+
+    ensureCursorVisible(cm);
+    cm.curOp.updateInput = updateInput;
+    cm.curOp.typing = true;
+    cm.state.pasteIncoming = cm.state.cutIncoming = false;
+  }
+
+  function handlePaste(e, cm) {
+    var pasted = e.clipboardData && e.clipboardData.getData("text/plain");
+    if (pasted) {
+      e.preventDefault();
+      if (!isReadOnly(cm) && !cm.options.disableInput)
+        runInOp(cm, function() { applyTextInput(cm, pasted, 0, null, "paste"); });
+      return true;
+    }
+  }
+
+  function triggerElectric(cm, inserted) {
+    // When an 'electric' character is inserted, immediately trigger a reindent
+    if (!cm.options.electricChars || !cm.options.smartIndent) return;
+    var sel = cm.doc.sel;
+
+    for (var i = sel.ranges.length - 1; i >= 0; i--) {
+      var range = sel.ranges[i];
+      if (range.head.ch > 100 || (i && sel.ranges[i - 1].head.line == range.head.line)) continue;
+      var mode = cm.getModeAt(range.head);
+      var indented = false;
+      if (mode.electricChars) {
+        for (var j = 0; j < mode.electricChars.length; j++)
+          if (inserted.indexOf(mode.electricChars.charAt(j)) > -1) {
+            indented = indentLine(cm, range.head.line, "smart");
+            break;
+          }
+      } else if (mode.electricInput) {
+        if (mode.electricInput.test(getLine(cm.doc, range.head.line).text.slice(0, range.head.ch)))
+          indented = indentLine(cm, range.head.line, "smart");
+      }
+      if (indented) signalLater(cm, "electricInput", cm, range.head.line);
+    }
+  }
+
+  function copyableRanges(cm) {
+    var text = [], ranges = [];
+    for (var i = 0; i < cm.doc.sel.ranges.length; i++) {
+      var line = cm.doc.sel.ranges[i].head.line;
+      var lineRange = {anchor: Pos(line, 0), head: Pos(line + 1, 0)};
+      ranges.push(lineRange);
+      text.push(cm.getRange(lineRange.anchor, lineRange.head));
+    }
+    return {text: text, ranges: ranges};
+  }
+
+  function disableBrowserMagic(field) {
+    field.setAttribute("autocorrect", "off");
+    field.setAttribute("autocapitalize", "off");
+    field.setAttribute("spellcheck", "false");
+  }
+
+  // TEXTAREA INPUT STYLE
+
+  function TextareaInput(cm) {
+    this.cm = cm;
+    // See input.poll and input.reset
+    this.prevInput = "";
+
+    // Flag that indicates whether we expect input to appear real soon
+    // now (after some event like 'keypress' or 'input') and are
+    // polling intensively.
+    this.pollingFast = false;
+    // Self-resetting timeout for the poller
+    this.polling = new Delayed();
+    // Tracks when input.reset has punted to just putting a short
+    // string into the textarea instead of the full selection.
+    this.inaccurateSelection = false;
+    // Used to work around IE issue with selection being forgotten when focus moves away from textarea
+    this.hasSelection = false;
+    this.composing = null;
+  };
+
+  function hiddenTextarea() {
+    var te = elt("textarea", null, null, "position: absolute; padding: 0; width: 1px; height: 1em; outline: none");
+    var div = elt("div", [te], null, "overflow: hidden; position: relative; width: 3px; height: 0px;");
+    // The textarea is kept positioned near the cursor to prevent the
+    // fact that it'll be scrolled into view on input from scrolling
+    // our fake cursor out of view. On webkit, when wrap=off, paste is
+    // very slow. So make the area wide instead.
+    if (webkit) te.style.width = "1000px";
+    else te.setAttribute("wrap", "off");
+    // If border: 0; -- iOS fails to open keyboard (issue #1287)
+    if (ios) te.style.border = "1px solid black";
+    disableBrowserMagic(te);
+    return div;
+  }
+
+  TextareaInput.prototype = copyObj({
+    init: function(display) {
+      var input = this, cm = this.cm;
+
+      // Wraps and hides input textarea
+      var div = this.wrapper = hiddenTextarea();
+      // The semihidden textarea that is focused when the editor is
+      // focused, and receives input.
+      var te = this.textarea = div.firstChild;
+      display.wrapper.insertBefore(div, display.wrapper.firstChild);
+
+      // Needed to hide big blue blinking cursor on Mobile Safari (doesn't seem to work in iOS 8 anymore)
+      if (ios) te.style.width = "0px";
+
+      on(te, "input", function() {
+        if (ie && ie_version >= 9 && input.hasSelection) input.hasSelection = null;
+        input.poll();
+      });
+
+      on(te, "paste", function(e) {
+        if (handlePaste(e, cm)) return true;
+
+        cm.state.pasteIncoming = true;
+        input.fastPoll();
+      });
+
+      function prepareCopyCut(e) {
+        if (cm.somethingSelected()) {
+          lastCopied = cm.getSelections();
+          if (input.inaccurateSelection) {
+            input.prevInput = "";
+            input.inaccurateSelection = false;
+            te.value = lastCopied.join("\n");
+            selectInput(te);
+          }
+        } else if (!cm.options.lineWiseCopyCut) {
+          return;
+        } else {
+          var ranges = copyableRanges(cm);
+          lastCopied = ranges.text;
+          if (e.type == "cut") {
+            cm.setSelections(ranges.ranges, null, sel_dontScroll);
+          } else {
+            input.prevInput = "";
+            te.value = ranges.text.join("\n");
+            selectInput(te);
+          }
+        }
+        if (e.type == "cut") cm.state.cutIncoming = true;
+      }
+      on(te, "cut", prepareCopyCut);
+      on(te, "copy", prepareCopyCut);
+
+      on(display.scroller, "paste", function(e) {
+        if (eventInWidget(display, e)) return;
+        cm.state.pasteIncoming = true;
+        input.focus();
+      });
+
+      // Prevent normal selection in the editor (we handle our own)
+      on(display.lineSpace, "selectstart", function(e) {
+        if (!eventInWidget(display, e)) e_preventDefault(e);
+      });
+
+      on(te, "compositionstart", function() {
+        var start = cm.getCursor("from");
+        input.composing = {
+          start: start,
+          range: cm.markText(start, cm.getCursor("to"), {className: "CodeMirror-composing"})
+        };
+      });
+      on(te, "compositionend", function() {
+        if (input.composing) {
+          input.poll();
+          input.composing.range.clear();
+          input.composing = null;
+        }
+      });
+    },
+
+    prepareSelection: function() {
+      // Redraw the selection and/or cursor
+      var cm = this.cm, display = cm.display, doc = cm.doc;
+      var result = prepareSelection(cm);
+
+      // Move the hidden textarea near the cursor to prevent scrolling artifacts
+      if (cm.options.moveInputWithCursor) {
+        var headPos = cursorCoords(cm, doc.sel.primary().head, "div");
+        var wrapOff = display.wrapper.getBoundingClientRect(), lineOff = display.lineDiv.getBoundingClientRect();
+        result.teTop = Math.max(0, Math.min(display.wrapper.clientHeight - 10,
+                                            headPos.top + lineOff.top - wrapOff.top));
+        result.teLeft = Math.max(0, Math.min(display.wrapper.clientWidth - 10,
+                                             headPos.left + lineOff.left - wrapOff.left));
+      }
+
+      return result;
+    },
+
+    showSelection: function(drawn) {
+      var cm = this.cm, display = cm.display;
+      removeChildrenAndAdd(display.cursorDiv, drawn.cursors);
+      removeChildrenAndAdd(display.selectionDiv, drawn.selection);
+      if (drawn.teTop != null) {
+        this.wrapper.style.top = drawn.teTop + "px";
+        this.wrapper.style.left = drawn.teLeft + "px";
+      }
+    },
+
+    // Reset the input to correspond to the selection (or to be empty,
+    // when not typing and nothing is selected)
+    reset: function(typing) {
+      if (this.contextMenuPending) return;
+      var minimal, selected, cm = this.cm, doc = cm.doc;
+      if (cm.somethingSelected()) {
+        this.prevInput = "";
+        var range = doc.sel.primary();
+        minimal = hasCopyEvent &&
+          (range.to().line - range.from().line > 100 || (selected = cm.getSelection()).length > 1000);
+        var content = minimal ? "-" : selected || cm.getSelection();
+        this.textarea.value = content;
+        if (cm.state.focused) selectInput(this.textarea);
+        if (ie && ie_version >= 9) this.hasSelection = content;
+      } else if (!typing) {
+        this.prevInput = this.textarea.value = "";
+        if (ie && ie_version >= 9) this.hasSelection = null;
+      }
+      this.inaccurateSelection = minimal;
+    },
+
+    getField: function() { return this.textarea; },
+
+    supportsTouch: function() { return false; },
+
+    focus: function() {
+      if (this.cm.options.readOnly != "nocursor" && (!mobile || activeElt() != this.textarea)) {
+        try { this.textarea.focus(); }
+        catch (e) {} // IE8 will throw if the textarea is display: none or not in DOM
+      }
+    },
+
+    blur: function() { this.textarea.blur(); },
+
+    resetPosition: function() {
+      this.wrapper.style.top = this.wrapper.style.left = 0;
+    },
+
+    receivedFocus: function() { this.slowPoll(); },
+
+    // Poll for input changes, using the normal rate of polling. This
+    // runs as long as the editor is focused.
+    slowPoll: function() {
+      var input = this;
+      if (input.pollingFast) return;
+      input.polling.set(this.cm.options.pollInterval, function() {
+        input.poll();
+        if (input.cm.state.focused) input.slowPoll();
+      });
+    },
+
+    // When an event has just come in that is likely to add or change
+    // something in the input textarea, we poll faster, to ensure that
+    // the change appears on the screen quickly.
+    fastPoll: function() {
+      var missed = false, input = this;
+      input.pollingFast = true;
+      function p() {
+        var changed = input.poll();
+        if (!changed && !missed) {missed = true; input.polling.set(60, p);}
+        else {input.pollingFast = false; input.slowPoll();}
+      }
+      input.polling.set(20, p);
+    },
+
+    // Read input from the textarea, and update the document to match.
+    // When something is selected, it is present in the textarea, and
+    // selected (unless it is huge, in which case a placeholder is
+    // used). When nothing is selected, the cursor sits after previously
+    // seen text (can be empty), which is stored in prevInput (we must
+    // not reset the textarea when typing, because that breaks IME).
+    poll: function() {
+      var cm = this.cm, input = this.textarea, prevInput = this.prevInput;
+      // Since this is called a *lot*, try to bail out as cheaply as
+      // possible when it is clear that nothing happened. hasSelection
+      // will be the case when there is a lot of text in the textarea,
+      // in which case reading its value would be expensive.
+      if (this.contextMenuPending || !cm.state.focused ||
+          (hasSelection(input) && !prevInput && !this.composing) ||
+          isReadOnly(cm) || cm.options.disableInput || cm.state.keySeq)
+        return false;
+
+      var text = input.value;
+      // If nothing changed, bail.
+      if (text == prevInput && !cm.somethingSelected()) return false;
+      // Work around nonsensical selection resetting in IE9/10, and
+      // inexplicable appearance of private area unicode characters on
+      // some key combos in Mac (#2689).
+      if (ie && ie_version >= 9 && this.hasSelection === text ||
+          mac && /[\uf700-\uf7ff]/.test(text)) {
+        cm.display.input.reset();
+        return false;
+      }
+
+      if (cm.doc.sel == cm.display.selForContextMenu) {
+        var first = text.charCodeAt(0);
+        if (first == 0x200b && !prevInput) prevInput = "\u200b";
+        if (first == 0x21da) { this.reset(); return this.cm.execCommand("undo"); }
+      }
+      // Find the part of the input that is actually new
+      var same = 0, l = Math.min(prevInput.length, text.length);
+      while (same < l && prevInput.charCodeAt(same) == text.charCodeAt(same)) ++same;
+
+      var self = this;
+      runInOp(cm, function() {
+        applyTextInput(cm, text.slice(same), prevInput.length - same,
+                       null, self.composing ? "*compose" : null);
+
+        // Don't leave long text in the textarea, since it makes further polling slow
+        if (text.length > 1000 || text.indexOf("\n") > -1) input.value = self.prevInput = "";
+        else self.prevInput = text;
+
+        if (self.composing) {
+          self.composing.range.clear();
+          self.composing.range = cm.markText(self.composing.start, cm.getCursor("to"),
+                                             {className: "CodeMirror-composing"});
+        }
+      });
+      return true;
+    },
+
+    ensurePolled: function() {
+      if (this.pollingFast && this.poll()) this.pollingFast = false;
+    },
+
+    onKeyPress: function() {
+      if (ie && ie_version >= 9) this.hasSelection = null;
+      this.fastPoll();
+    },
+
+    onContextMenu: function(e) {
+      var input = this, cm = input.cm, display = cm.display, te = input.textarea;
+      var pos = posFromMouse(cm, e), scrollPos = display.scroller.scrollTop;
+      if (!pos || presto) return; // Opera is difficult.
+
+      // Reset the current text selection only if the click is done outside of the selection
+      // and 'resetSelectionOnContextMenu' option is true.
+      var reset = cm.options.resetSelectionOnContextMenu;
+      if (reset && cm.doc.sel.contains(pos) == -1)
+        operation(cm, setSelection)(cm.doc, simpleSelection(pos), sel_dontScroll);
+
+      var oldCSS = te.style.cssText;
+      input.wrapper.style.position = "absolute";
+      te.style.cssText = "position: fixed; width: 30px; height: 30px; top: " + (e.clientY - 5) +
+        "px; left: " + (e.clientX - 5) + "px; z-index: 1000; background: " +
+        (ie ? "rgba(255, 255, 255, .05)" : "transparent") +
+        "; outline: none; border-width: 0; outline: none; overflow: hidden; opacity: .05; filter: alpha(opacity=5);";
+      if (webkit) var oldScrollY = window.scrollY; // Work around Chrome issue (#2712)
+      display.input.focus();
+      if (webkit) window.scrollTo(null, oldScrollY);
+      display.input.reset();
+      // Adds "Select all" to context menu in FF
+      if (!cm.somethingSelected()) te.value = input.prevInput = " ";
+      input.contextMenuPending = true;
+      display.selForContextMenu = cm.doc.sel;
+      clearTimeout(display.detectingSelectAll);
+
+      // Select-all will be greyed out if there's nothing to select, so
+      // this adds a zero-width space so that we can later check whether
+      // it got selected.
+      function prepareSelectAllHack() {
+        if (te.selectionStart != null) {
+          var selected = cm.somethingSelected();
+          var extval = "\u200b" + (selected ? te.value : "");
+          te.value = "\u21da"; // Used to catch context-menu undo
+          te.value = extval;
+          input.prevInput = selected ? "" : "\u200b";
+          te.selectionStart = 1; te.selectionEnd = extval.length;
+          // Re-set this, in case some other handler touched the
+          // selection in the meantime.
+          display.selForContextMenu = cm.doc.sel;
+        }
+      }
+      function rehide() {
+        input.contextMenuPending = false;
+        input.wrapper.style.position = "relative";
+        te.style.cssText = oldCSS;
+        if (ie && ie_version < 9) display.scrollbars.setScrollTop(display.scroller.scrollTop = scrollPos);
+
+        // Try to detect the user choosing select-all
+        if (te.selectionStart != null) {
+          if (!ie || (ie && ie_version < 9)) prepareSelectAllHack();
+          var i = 0, poll = function() {
+            if (display.selForContextMenu == cm.doc.sel && te.selectionStart == 0 &&
+                te.selectionEnd > 0 && input.prevInput == "\u200b")
+              operation(cm, commands.selectAll)(cm);
+            else if (i++ < 10) display.detectingSelectAll = setTimeout(poll, 500);
+            else display.input.reset();
+          };
+          display.detectingSelectAll = setTimeout(poll, 200);
+        }
+      }
+
+      if (ie && ie_version >= 9) prepareSelectAllHack();
+      if (captureRightClick) {
+        e_stop(e);
+        var mouseup = function() {
+          off(window, "mouseup", mouseup);
+          setTimeout(rehide, 20);
+        };
+        on(window, "mouseup", mouseup);
+      } else {
+        setTimeout(rehide, 50);
+      }
+    },
+
+    setUneditable: nothing,
+
+    needsContentAttribute: false
+  }, TextareaInput.prototype);
+
+  // CONTENTEDITABLE INPUT STYLE
+
+  function ContentEditableInput(cm) {
+    this.cm = cm;
+    this.lastAnchorNode = this.lastAnchorOffset = this.lastFocusNode = this.lastFocusOffset = null;
+    this.polling = new Delayed();
+    this.gracePeriod = false;
+  }
+
+  ContentEditableInput.prototype = copyObj({
+    init: function(display) {
+      var input = this, cm = input.cm;
+      var div = input.div = display.lineDiv;
+      div.contentEditable = "true";
+      disableBrowserMagic(div);
+
+      on(div, "paste", function(e) { handlePaste(e, cm); })
+
+      on(div, "compositionstart", function(e) {
+        var data = e.data;
+        input.composing = {sel: cm.doc.sel, data: data, startData: data};
+        if (!data) return;
+        var prim = cm.doc.sel.primary();
+        var line = cm.getLine(prim.head.line);
+        var found = line.indexOf(data, Math.max(0, prim.head.ch - data.length));
+        if (found > -1 && found <= prim.head.ch)
+          input.composing.sel = simpleSelection(Pos(prim.head.line, found),
+                                                Pos(prim.head.line, found + data.length));
+      });
+      on(div, "compositionupdate", function(e) {
+        input.composing.data = e.data;
+      });
+      on(div, "compositionend", function(e) {
+        var ours = input.composing;
+        if (!ours) return;
+        if (e.data != ours.startData && !/\u200b/.test(e.data))
+          ours.data = e.data;
+        // Need a small delay to prevent other code (input event,
+        // selection polling) from doing damage when fired right after
+        // compositionend.
+        setTimeout(function() {
+          if (!ours.handled)
+            input.applyComposition(ours);
+          if (input.composing == ours)
+            input.composing = null;
+        }, 50);
+      });
+
+      on(div, "touchstart", function() {
+        input.forceCompositionEnd();
+      });
+
+      on(div, "input", function() {
+        if (input.composing) return;
+        if (!input.pollContent())
+          runInOp(input.cm, function() {regChange(cm);});
+      });
+
+      function onCopyCut(e) {
+        if (cm.somethingSelected()) {
+          lastCopied = cm.getSelections();
+          if (e.type == "cut") cm.replaceSelection("", null, "cut");
+        } else if (!cm.options.lineWiseCopyCut) {
+          return;
+        } else {
+          var ranges = copyableRanges(cm);
+          lastCopied = ranges.text;
+          if (e.type == "cut") {
+            cm.operation(function() {
+              cm.setSelections(ranges.ranges, 0, sel_dontScroll);
+              cm.replaceSelection("", null, "cut");
+            });
+          }
+        }
+        // iOS exposes the clipboard API, but seems to discard content inserted into it
+        if (e.clipboardData && !ios) {
+          e.preventDefault();
+          e.clipboardData.clearData();
+          e.clipboardData.setData("text/plain", lastCopied.join("\n"));
+        } else {
+          // Old-fashioned briefly-focus-a-textarea hack
+          var kludge = hiddenTextarea(), te = kludge.firstChild;
+          cm.display.lineSpace.insertBefore(kludge, cm.display.lineSpace.firstChild);
+          te.value = lastCopied.join("\n");
+          var hadFocus = document.activeElement;
+          selectInput(te);
+          setTimeout(function() {
+            cm.display.lineSpace.removeChild(kludge);
+            hadFocus.focus();
+          }, 50);
+        }
+      }
+      on(div, "copy", onCopyCut);
+      on(div, "cut", onCopyCut);
+    },
+
+    prepareSelection: function() {
+      var result = prepareSelection(this.cm, false);
+      result.focus = this.cm.state.focused;
+      return result;
+    },
+
+    showSelection: function(info) {
+      if (!info || !this.cm.display.view.length) return;
+      if (info.focus) this.showPrimarySelection();
+      this.showMultipleSelections(info);
+    },
+
+    showPrimarySelection: function() {
+      var sel = window.getSelection(), prim = this.cm.doc.sel.primary();
+      var curAnchor = domToPos(this.cm, sel.anchorNode, sel.anchorOffset);
+      var curFocus = domToPos(this.cm, sel.focusNode, sel.focusOffset);
+      if (curAnchor && !curAnchor.bad && curFocus && !curFocus.bad &&
+          cmp(minPos(curAnchor, curFocus), prim.from()) == 0 &&
+          cmp(maxPos(curAnchor, curFocus), prim.to()) == 0)
+        return;
+
+      var start = posToDOM(this.cm, prim.from());
+      var end = posToDOM(this.cm, prim.to());
+      if (!start && !end) return;
+
+      var view = this.cm.display.view;
+      var old = sel.rangeCount && sel.getRangeAt(0);
+      if (!start) {
+        start = {node: view[0].measure.map[2], offset: 0};
+      } else if (!end) { // FIXME dangerously hacky
+        var measure = view[view.length - 1].measure;
+        var map = measure.maps ? measure.maps[measure.maps.length - 1] : measure.map;
+        end = {node: map[map.length - 1], offset: map[map.length - 2] - map[map.length - 3]};
+      }
+
+      try { var rng = range(start.node, start.offset, end.offset, end.node); }
+      catch(e) {} // Our model of the DOM might be outdated, in which case the range we try to set can be impossible
+      if (rng) {
+        sel.removeAllRanges();
+        sel.addRange(rng);
+        if (old && sel.anchorNode == null) sel.addRange(old);
+        else if (gecko) this.startGracePeriod();
+      }
+      this.rememberSelection();
+    },
+
+    startGracePeriod: function() {
+      var input = this;
+      clearTimeout(this.gracePeriod);
+      this.gracePeriod = setTimeout(function() {
+        input.gracePeriod = false;
+        if (input.selectionChanged())
+          input.cm.operation(function() { input.cm.curOp.selectionChanged = true; });
+      }, 20);
+    },
+
+    showMultipleSelections: function(info) {
+      removeChildrenAndAdd(this.cm.display.cursorDiv, info.cursors);
+      removeChildrenAndAdd(this.cm.display.selectionDiv, info.selection);
+    },
+
+    rememberSelection: function() {
+      var sel = window.getSelection();
+      this.lastAnchorNode = sel.anchorNode; this.lastAnchorOffset = sel.anchorOffset;
+      this.lastFocusNode = sel.focusNode; this.lastFocusOffset = sel.focusOffset;
+    },
+
+    selectionInEditor: function() {
+      var sel = window.getSelection();
+      if (!sel.rangeCount) return false;
+      var node = sel.getRangeAt(0).commonAncestorContainer;
+      return contains(this.div, node);
+    },
+
+    focus: function() {
+      if (this.cm.options.readOnly != "nocursor") this.div.focus();
+    },
+    blur: function() { this.div.blur(); },
+    getField: function() { return this.div; },
+
+    supportsTouch: function() { return true; },
+
+    receivedFocus: function() {
+      var input = this;
+      if (this.selectionInEditor())
+        this.pollSelection();
+      else
+        runInOp(this.cm, function() { input.cm.curOp.selectionChanged = true; });
+
+      function poll() {
+        if (input.cm.state.focused) {
+          input.pollSelection();
+          input.polling.set(input.cm.options.pollInterval, poll);
+        }
+      }
+      this.polling.set(this.cm.options.pollInterval, poll);
+    },
+
+    selectionChanged: function() {
+      var sel = window.getSelection();
+      return sel.anchorNode != this.lastAnchorNode || sel.anchorOffset != this.lastAnchorOffset ||
+        sel.focusNode != this.lastFocusNode || sel.focusOffset != this.lastFocusOffset;
+    },
+
+    pollSelection: function() {
+      if (!this.composing && !this.gracePeriod && this.selectionChanged()) {
+        var sel = window.getSelection(), cm = this.cm;
+        this.rememberSelection();
+        var anchor = domToPos(cm, sel.anchorNode, sel.anchorOffset);
+        var head = domToPos(cm, sel.focusNode, sel.focusOffset);
+        if (anchor && head) runInOp(cm, function() {
+          setSelection(cm.doc, simpleSelection(anchor, head), sel_dontScroll);
+          if (anchor.bad || head.bad) cm.curOp.selectionChanged = true;
+        });
+      }
+    },
+
+    pollContent: function() {
+      var cm = this.cm, display = cm.display, sel = cm.doc.sel.primary();
+      var from = sel.from(), to = sel.to();
+      if (from.line < display.viewFrom || to.line > display.viewTo - 1) return false;
+
+      var fromIndex;
+      if (from.line == display.viewFrom || (fromIndex = findViewIndex(cm, from.line)) == 0) {
+        var fromLine = lineNo(display.view[0].line);
+        var fromNode = display.view[0].node;
+      } else {
+        var fromLine = lineNo(display.view[fromIndex].line);
+        var fromNode = display.view[fromIndex - 1].node.nextSibling;
+      }
+      var toIndex = findViewIndex(cm, to.line);
+      if (toIndex == display.view.length - 1) {
+        var toLine = display.viewTo - 1;
+        var toNode = display.lineDiv.lastChild;
+      } else {
+        var toLine = lineNo(display.view[toIndex + 1].line) - 1;
+        var toNode = display.view[toIndex + 1].node.previousSibling;
+      }
+
+      var newText = cm.doc.splitLines(domTextBetween(cm, fromNode, toNode, fromLine, toLine));
+      var oldText = getBetween(cm.doc, Pos(fromLine, 0), Pos(toLine, getLine(cm.doc, toLine).text.length));
+      while (newText.length > 1 && oldText.length > 1) {
+        if (lst(newText) == lst(oldText)) { newText.pop(); oldText.pop(); toLine--; }
+        else if (newText[0] == oldText[0]) { newText.shift(); oldText.shift(); fromLine++; }
+        else break;
+      }
+
+      var cutFront = 0, cutEnd = 0;
+      var newTop = newText[0], oldTop = oldText[0], maxCutFront = Math.min(newTop.length, oldTop.length);
+      while (cutFront < maxCutFront && newTop.charCodeAt(cutFront) == oldTop.charCodeAt(cutFront))
+        ++cutFront;
+      var newBot = lst(newText), oldBot = lst(oldText);
+      var maxCutEnd = Math.min(newBot.length - (newText.length == 1 ? cutFront : 0),
+                               oldBot.length - (oldText.length == 1 ? cutFront : 0));
+      while (cutEnd < maxCutEnd &&
+             newBot.charCodeAt(newBot.length - cutEnd - 1) == oldBot.charCodeAt(oldBot.length - cutEnd - 1))
+        ++cutEnd;
+
+      newText[newText.length - 1] = newBot.slice(0, newBot.length - cutEnd);
+      newText[0] = newText[0].slice(cutFront);
+
+      var chFrom = Pos(fromLine, cutFront);
+      var chTo = Pos(toLine, oldText.length ? lst(oldText).length - cutEnd : 0);
+      if (newText.length > 1 || newText[0] || cmp(chFrom, chTo)) {
+        replaceRange(cm.doc, newText, chFrom, chTo, "+input");
+        return true;
+      }
+    },
+
+    ensurePolled: function() {
+      this.forceCompositionEnd();
+    },
+    reset: function() {
+      this.forceCompositionEnd();
+    },
+    forceCompositionEnd: function() {
+      if (!this.composing || this.composing.handled) return;
+      this.applyComposition(this.composing);
+      this.composing.handled = true;
+      this.div.blur();
+      this.div.focus();
+    },
+    applyComposition: function(composing) {
+      if (composing.data && composing.data != composing.startData)
+        operation(this.cm, applyTextInput)(this.cm, composing.data, 0, composing.sel);
+    },
+
+    setUneditable: function(node) {
+      node.setAttribute("contenteditable", "false");
+    },
+
+    onKeyPress: function(e) {
+      e.preventDefault();
+      operation(this.cm, applyTextInput)(this.cm, String.fromCharCode(e.charCode == null ? e.keyCode : e.charCode), 0);
+    },
+
+    onContextMenu: nothing,
+    resetPosition: nothing,
+
+    needsContentAttribute: true
+  }, ContentEditableInput.prototype);
+
+  function posToDOM(cm, pos) {
+    var view = findViewForLine(cm, pos.line);
+    if (!view || view.hidden) return null;
+    var line = getLine(cm.doc, pos.line);
+    var info = mapFromLineView(view, line, pos.line);
+
+    var order = getOrder(line), side = "left";
+    if (order) {
+      var partPos = getBidiPartAt(order, pos.ch);
+      side = partPos % 2 ? "right" : "left";
+    }
+    var result = nodeAndOffsetInLineMap(info.map, pos.ch, side);
+    result.offset = result.collapse == "right" ? result.end : result.start;
+    return result;
+  }
+
+  function badPos(pos, bad) { if (bad) pos.bad = true; return pos; }
+
+  function domToPos(cm, node, offset) {
+    var lineNode;
+    if (node == cm.display.lineDiv) {
+      lineNode = cm.display.lineDiv.childNodes[offset];
+      if (!lineNode) return badPos(cm.clipPos(Pos(cm.display.viewTo - 1)), true);
+      node = null; offset = 0;
+    } else {
+      for (lineNode = node;; lineNode = lineNode.parentNode) {
+        if (!lineNode || lineNode == cm.display.lineDiv) return null;
+        if (lineNode.parentNode && lineNode.parentNode == cm.display.lineDiv) break;
+      }
+    }
+    for (var i = 0; i < cm.display.view.length; i++) {
+      var lineView = cm.display.view[i];
+      if (lineView.node == lineNode)
+        return locateNodeInLineView(lineView, node, offset);
+    }
+  }
+
+  function locateNodeInLineView(lineView, node, offset) {
+    var wrapper = lineView.text.firstChild, bad = false;
+    if (!node || !contains(wrapper, node)) return badPos(Pos(lineNo(lineView.line), 0), true);
+    if (node == wrapper) {
+      bad = true;
+      node = wrapper.childNodes[offset];
+      offset = 0;
+      if (!node) {
+        var line = lineView.rest ? lst(lineView.rest) : lineView.line;
+        return badPos(Pos(lineNo(line), line.text.length), bad);
+      }
+    }
+
+    var textNode = node.nodeType == 3 ? node : null, topNode = node;
+    if (!textNode && node.childNodes.length == 1 && node.firstChild.nodeType == 3) {
+      textNode = node.firstChild;
+      if (offset) offset = textNode.nodeValue.length;
+    }
+    while (topNode.parentNode != wrapper) topNode = topNode.parentNode;
+    var measure = lineView.measure, maps = measure.maps;
+
+    function find(textNode, topNode, offset) {
+      for (var i = -1; i < (maps ? maps.length : 0); i++) {
+        var map = i < 0 ? measure.map : maps[i];
+        for (var j = 0; j < map.length; j += 3) {
+          var curNode = map[j + 2];
+          if (curNode == textNode || curNode == topNode) {
+            var line = lineNo(i < 0 ? lineView.line : lineView.rest[i]);
+            var ch = map[j] + offset;
+            if (offset < 0 || curNode != textNode) ch = map[j + (offset ? 1 : 0)];
+            return Pos(line, ch);
+          }
+        }
+      }
+    }
+    var found = find(textNode, topNode, offset);
+    if (found) return badPos(found, bad);
+
+    // FIXME this is all really shaky. might handle the few cases it needs to handle, but likely to cause problems
+    for (var after = topNode.nextSibling, dist = textNode ? textNode.nodeValue.length - offset : 0; after; after = after.nextSibling) {
+      found = find(after, after.firstChild, 0);
+      if (found)
+        return badPos(Pos(found.line, found.ch - dist), bad);
+      else
+        dist += after.textContent.length;
+    }
+    for (var before = topNode.previousSibling, dist = offset; before; before = before.previousSibling) {
+      found = find(before, before.firstChild, -1);
+      if (found)
+        return badPos(Pos(found.line, found.ch + dist), bad);
+      else
+        dist += after.textContent.length;
+    }
+  }
+
+  function domTextBetween(cm, from, to, fromLine, toLine) {
+    var text = "", closing = false, lineSep = cm.doc.lineSeparator();
+    function recognizeMarker(id) { return function(marker) { return marker.id == id; }; }
+    function walk(node) {
+      if (node.nodeType == 1) {
+        var cmText = node.getAttribute("cm-text");
+        if (cmText != null) {
+          if (cmText == "") cmText = node.textContent.replace(/\u200b/g, "");
+          text += cmText;
+          return;
+        }
+        var markerID = node.getAttribute("cm-marker"), range;
+        if (markerID) {
+          var found = cm.findMarks(Pos(fromLine, 0), Pos(toLine + 1, 0), recognizeMarker(+markerID));
+          if (found.length && (range = found[0].find()))
+            text += getBetween(cm.doc, range.from, range.to).join(lineSep);
+          return;
+        }
+        if (node.getAttribute("contenteditable") == "false") return;
+        for (var i = 0; i < node.childNodes.length; i++)
+          walk(node.childNodes[i]);
+        if (/^(pre|div|p)$/i.test(node.nodeName))
+          closing = true;
+      } else if (node.nodeType == 3) {
+        var val = node.nodeValue;
+        if (!val) return;
+        if (closing) {
+          text += lineSep;
+          closing = false;
+        }
+        text += val;
+      }
+    }
+    for (;;) {
+      walk(from);
+      if (from == to) break;
+      from = from.nextSibling;
+    }
+    return text;
+  }
+
+  CodeMirror.inputStyles = {"textarea": TextareaInput, "contenteditable": ContentEditableInput};
+
+  // SELECTION / CURSOR
+
+  // Selection objects are immutable. A new one is created every time
+  // the selection changes. A selection is one or more non-overlapping
+  // (and non-touching) ranges, sorted, and an integer that indicates
+  // which one is the primary selection (the one that's scrolled into
+  // view, that getCursor returns, etc).
+  function Selection(ranges, primIndex) {
+    this.ranges = ranges;
+    this.primIndex = primIndex;
+  }
+
+  Selection.prototype = {
+    primary: function() { return this.ranges[this.primIndex]; },
+    equals: function(other) {
+      if (other == this) return true;
+      if (other.primIndex != this.primIndex || other.ranges.length != this.ranges.length) return false;
+      for (var i = 0; i < this.ranges.length; i++) {
+        var here = this.ranges[i], there = other.ranges[i];
+        if (cmp(here.anchor, there.anchor) != 0 || cmp(here.head, there.head) != 0) return false;
+      }
+      return true;
+    },
+    deepCopy: function() {
+      for (var out = [], i = 0; i < this.ranges.length; i++)
+        out[i] = new Range(copyPos(this.ranges[i].anchor), copyPos(this.ranges[i].head));
+      return new Selection(out, this.primIndex);
+    },
+    somethingSelected: function() {
+      for (var i = 0; i < this.ranges.length; i++)
+        if (!this.ranges[i].empty()) return true;
+      return false;
+    },
+    contains: function(pos, end) {
+      if (!end) end = pos;
+      for (var i = 0; i < this.ranges.length; i++) {
+        var range = this.ranges[i];
+        if (cmp(end, range.from()) >= 0 && cmp(pos, range.to()) <= 0)
+          return i;
+      }
+      return -1;
+    }
+  };
+
+  function Range(anchor, head) {
+    this.anchor = anchor; this.head = head;
+  }
+
+  Range.prototype = {
+    from: function() { return minPos(this.anchor, this.head); },
+    to: function() { return maxPos(this.anchor, this.head); },
+    empty: function() {
+      return this.head.line == this.anchor.line && this.head.ch == this.anchor.ch;
+    }
+  };
+
+  // Take an unsorted, potentially overlapping set of ranges, and
+  // build a selection out of it. 'Consumes' ranges array (modifying
+  // it).
+  function normalizeSelection(ranges, primIndex) {
+    var prim = ranges[primIndex];
+    ranges.sort(function(a, b) { return cmp(a.from(), b.from()); });
+    primIndex = indexOf(ranges, prim);
+    for (var i = 1; i < ranges.length; i++) {
+      var cur = ranges[i], prev = ranges[i - 1];
+      if (cmp(prev.to(), cur.from()) >= 0) {
+        var from = minPos(prev.from(), cur.from()), to = maxPos(prev.to(), cur.to());
+        var inv = prev.empty() ? cur.from() == cur.head : prev.from() == prev.head;
+        if (i <= primIndex) --primIndex;
+        ranges.splice(--i, 2, new Range(inv ? to : from, inv ? from : to));
+      }
+    }
+    return new Selection(ranges, primIndex);
+  }
+
+  function simpleSelection(anchor, head) {
+    return new Selection([new Range(anchor, head || anchor)], 0);
+  }
+
+  // Most of the external API clips given positions to make sure they
+  // actually exist within the document.
+  function clipLine(doc, n) {return Math.max(doc.first, Math.min(n, doc.first + doc.size - 1));}
+  function clipPos(doc, pos) {
+    if (pos.line < doc.first) return Pos(doc.first, 0);
+    var last = doc.first + doc.size - 1;
+    if (pos.line > last) return Pos(last, getLine(doc, last).text.length);
+    return clipToLen(pos, getLine(doc, pos.line).text.length);
+  }
+  function clipToLen(pos, linelen) {
+    var ch = pos.ch;
+    if (ch == null || ch > linelen) return Pos(pos.line, linelen);
+    else if (ch < 0) return Pos(pos.line, 0);
+    else return pos;
+  }
+  function isLine(doc, l) {return l >= doc.first && l < doc.first + doc.size;}
+  function clipPosArray(doc, array) {
+    for (var out = [], i = 0; i < array.length; i++) out[i] = clipPos(doc, array[i]);
+    return out;
+  }
+
+  // SELECTION UPDATES
+
+  // The 'scroll' parameter given to many of these indicated whether
+  // the new cursor position should be scrolled into view after
+  // modifying the selection.
+
+  // If shift is held or the extend flag is set, extends a range to
+  // include a given position (and optionally a second position).
+  // Otherwise, simply returns the range between the given positions.
+  // Used for cursor motion and such.
+  function extendRange(doc, range, head, other) {
+    if (doc.cm && doc.cm.display.shift || doc.extend) {
+      var anchor = range.anchor;
+      if (other) {
+        var posBefore = cmp(head, anchor) < 0;
+        if (posBefore != (cmp(other, anchor) < 0)) {
+          anchor = head;
+          head = other;
+        } else if (posBefore != (cmp(head, other) < 0)) {
+          head = other;
+        }
+      }
+      return new Range(anchor, head);
+    } else {
+      return new Range(other || head, head);
+    }
+  }
+
+  // Extend the primary selection range, discard the rest.
+  function extendSelection(doc, head, other, options) {
+    setSelection(doc, new Selection([extendRange(doc, doc.sel.primary(), head, other)], 0), options);
+  }
+
+  // Extend all selections (pos is an array of selections with length
+  // equal the number of selections)
+  function extendSelections(doc, heads, options) {
+    for (var out = [], i = 0; i < doc.sel.ranges.length; i++)
+      out[i] = extendRange(doc, doc.sel.ranges[i], heads[i], null);
+    var newSel = normalizeSelection(out, doc.sel.primIndex);
+    setSelection(doc, newSel, options);
+  }
+
+  // Updates a single range in the selection.
+  function replaceOneSelection(doc, i, range, options) {
+    var ranges = doc.sel.ranges.slice(0);
+    ranges[i] = range;
+    setSelection(doc, normalizeSelection(ranges, doc.sel.primIndex), options);
+  }
+
+  // Reset the selection to a single range.
+  function setSimpleSelection(doc, anchor, head, options) {
+    setSelection(doc, simpleSelection(anchor, head), options);
+  }
+
+  // Give beforeSelectionChange handlers a change to influence a
+  // selection update.
+  function filterSelectionChange(doc, sel) {
+    var obj = {
+      ranges: sel.ranges,
+      update: function(ranges) {
+        this.ranges = [];
+        for (var i = 0; i < ranges.length; i++)
+          this.ranges[i] = new Range(clipPos(doc, ranges[i].anchor),
+                                     clipPos(doc, ranges[i].head));
+      }
+    };
+    signal(doc, "beforeSelectionChange", doc, obj);
+    if (doc.cm) signal(doc.cm, "beforeSelectionChange", doc.cm, obj);
+    if (obj.ranges != sel.ranges) return normalizeSelection(obj.ranges, obj.ranges.length - 1);
+    else return sel;
+  }
+
+  function setSelectionReplaceHistory(doc, sel, options) {
+    var done = doc.history.done, last = lst(done);
+    if (last && last.ranges) {
+      done[done.length - 1] = sel;
+      setSelectionNoUndo(doc, sel, options);
+    } else {
+      setSelection(doc, sel, options);
+    }
+  }
+
+  // Set a new selection.
+  function setSelection(doc, sel, options) {
+    setSelectionNoUndo(doc, sel, options);
+    addSelectionToHistory(doc, doc.sel, doc.cm ? doc.cm.curOp.id : NaN, options);
+  }
+
+  function setSelectionNoUndo(doc, sel, options) {
+    if (hasHandler(doc, "beforeSelectionChange") || doc.cm && hasHandler(doc.cm, "beforeSelectionChange"))
+      sel = filterSelectionChange(doc, sel);
+
+    var bias = options && options.bias ||
+      (cmp(sel.primary().head, doc.sel.primary().head) < 0 ? -1 : 1);
+    setSelectionInner(doc, skipAtomicInSelection(doc, sel, bias, true));
+
+    if (!(options && options.scroll === false) && doc.cm)
+      ensureCursorVisible(doc.cm);
+  }
+
+  function setSelectionInner(doc, sel) {
+    if (sel.equals(doc.sel)) return;
+
+    doc.sel = sel;
+
+    if (doc.cm) {
+      doc.cm.curOp.updateInput = doc.cm.curOp.selectionChanged = true;
+      signalCursorActivity(doc.cm);
+    }
+    signalLater(doc, "cursorActivity", doc);
+  }
+
+  // Verify that the selection does not partially select any atomic
+  // marked ranges.
+  function reCheckSelection(doc) {
+    setSelectionInner(doc, skipAtomicInSelection(doc, doc.sel, null, false), sel_dontScroll);
+  }
+
+  // Return a selection that does not partially select any atomic
+  // ranges.
+  function skipAtomicInSelection(doc, sel, bias, mayClear) {
+    var out;
+    for (var i = 0; i < sel.ranges.length; i++) {
+      var range = sel.ranges[i];
+      var newAnchor = skipAtomic(doc, range.anchor, bias, mayClear);
+      var newHead = skipAtomic(doc, range.head, bias, mayClear);
+      if (out || newAnchor != range.anchor || newHead != range.head) {
+        if (!out) out = sel.ranges.slice(0, i);
+        out[i] = new Range(newAnchor, newHead);
+      }
+    }
+    return out ? normalizeSelection(out, sel.primIndex) : sel;
+  }
+
+  // Ensure a given position is not inside an atomic range.
+  function skipAtomic(doc, pos, bias, mayClear) {
+    var flipped = false, curPos = pos;
+    var dir = bias || 1;
+    doc.cantEdit = false;
+    search: for (;;) {
+      var line = getLine(doc, curPos.line);
+      if (line.markedSpans) {
+        for (var i = 0; i < line.markedSpans.length; ++i) {
+          var sp = line.markedSpans[i], m = sp.marker;
+          if ((sp.from == null || (m.inclusiveLeft ? sp.from <= curPos.ch : sp.from < curPos.ch)) &&
+              (sp.to == null || (m.inclusiveRight ? sp.to >= curPos.ch : sp.to > curPos.ch))) {
+            if (mayClear) {
+              signal(m, "beforeCursorEnter");
+              if (m.explicitlyCleared) {
+                if (!line.markedSpans) break;
+                else {--i; continue;}
+              }
+            }
+            if (!m.atomic) continue;
+            var newPos = m.find(dir < 0 ? -1 : 1);
+            if (cmp(newPos, curPos) == 0) {
+              newPos.ch += dir;
+              if (newPos.ch < 0) {
+                if (newPos.line > doc.first) newPos = clipPos(doc, Pos(newPos.line - 1));
+                else newPos = null;
+              } else if (newPos.ch > line.text.length) {
+                if (newPos.line < doc.first + doc.size - 1) newPos = Pos(newPos.line + 1, 0);
+                else newPos = null;
+              }
+              if (!newPos) {
+                if (flipped) {
+                  // Driven in a corner -- no valid cursor position found at all
+                  // -- try again *with* clearing, if we didn't already
+                  if (!mayClear) return skipAtomic(doc, pos, bias, true);
+                  // Otherwise, turn off editing until further notice, and return the start of the doc
+                  doc.cantEdit = true;
+                  return Pos(doc.first, 0);
+                }
+                flipped = true; newPos = pos; dir = -dir;
+              }
+            }
+            curPos = newPos;
+            continue search;
+          }
+        }
+      }
+      return curPos;
+    }
+  }
+
+  // SELECTION DRAWING
+
+  function updateSelection(cm) {
+    cm.display.input.showSelection(cm.display.input.prepareSelection());
+  }
+
+  function prepareSelection(cm, primary) {
+    var doc = cm.doc, result = {};
+    var curFragment = result.cursors = document.createDocumentFragment();
+    var selFragment = result.selection = document.createDocumentFragment();
+
+    for (var i = 0; i < doc.sel.ranges.length; i++) {
+      if (primary === false && i == doc.sel.primIndex) continue;
+      var range = doc.sel.ranges[i];
+      var collapsed = range.empty();
+      if (collapsed || cm.options.showCursorWhenSelecting)
+        drawSelectionCursor(cm, range.head, curFragment);
+      if (!collapsed)
+        drawSelectionRange(cm, range, selFragment);
+    }
+    return result;
+  }
+
+  // Draws a cursor for the given range
+  function drawSelectionCursor(cm, head, output) {
+    var pos = cursorCoords(cm, head, "div", null, null, !cm.options.singleCursorHeightPerLine);
+
+    var cursor = output.appendChild(elt("div", "\u00a0", "CodeMirror-cursor"));
+    cursor.style.left = pos.left + "px";
+    cursor.style.top = pos.top + "px";
+    cursor.style.height = Math.max(0, pos.bottom - pos.top) * cm.options.cursorHeight + "px";
+
+    if (pos.other) {
+      // Secondary cursor, shown when on a 'jump' in bi-directional text
+      var otherCursor = output.appendChild(elt("div", "\u00a0", "CodeMirror-cursor CodeMirror-secondarycursor"));
+      otherCursor.style.display = "";
+      otherCursor.style.left = pos.other.left + "px";
+      otherCursor.style.top = pos.other.top + "px";
+      otherCursor.style.height = (pos.other.bottom - pos.other.top) * .85 + "px";
+    }
+  }
+
+  // Draws the given range as a highlighted selection
+  function drawSelectionRange(cm, range, output) {
+    var display = cm.display, doc = cm.doc;
+    var fragment = document.createDocumentFragment();
+    var padding = paddingH(cm.display), leftSide = padding.left;
+    var rightSide = Math.max(display.sizerWidth, displayWidth(cm) - display.sizer.offsetLeft) - padding.right;
+
+    function add(left, top, width, bottom) {
+      if (top < 0) top = 0;
+      top = Math.round(top);
+      bottom = Math.round(bottom);
+      fragment.appendChild(elt("div", null, "CodeMirror-selected", "position: absolute; left: " + left +
+                               "px; top: " + top + "px; width: " + (width == null ? rightSide - left : width) +
+                               "px; height: " + (bottom - top) + "px"));
+    }
+
+    function drawForLine(line, fromArg, toArg) {
+      var lineObj = getLine(doc, line);
+      var lineLen = lineObj.text.length;
+      var start, end;
+      function coords(ch, bias) {
+        return charCoords(cm, Pos(line, ch), "div", lineObj, bias);
+      }
+
+      iterateBidiSections(getOrder(lineObj), fromArg || 0, toArg == null ? lineLen : toArg, function(from, to, dir) {
+        var leftPos = coords(from, "left"), rightPos, left, right;
+        if (from == to) {
+          rightPos = leftPos;
+          left = right = leftPos.left;
+        } else {
+          rightPos = coords(to - 1, "right");
+          if (dir == "rtl") { var tmp = leftPos; leftPos = rightPos; rightPos = tmp; }
+          left = leftPos.left;
+          right = rightPos.right;
+        }
+        if (fromArg == null && from == 0) left = leftSide;
+        if (rightPos.top - leftPos.top > 3) { // Different lines, draw top part
+          add(left, leftPos.top, null, leftPos.bottom);
+          left = leftSide;
+          if (leftPos.bottom < rightPos.top) add(left, leftPos.bottom, null, rightPos.top);
+        }
+        if (toArg == null && to == lineLen) right = rightSide;
+        if (!start || leftPos.top < start.top || leftPos.top == start.top && leftPos.left < start.left)
+          start = leftPos;
+        if (!end || rightPos.bottom > end.bottom || rightPos.bottom == end.bottom && rightPos.right > end.right)
+          end = rightPos;
+        if (left < leftSide + 1) left = leftSide;
+        add(left, rightPos.top, right - left, rightPos.bottom);
+      });
+      return {start: start, end: end};
+    }
+
+    var sFrom = range.from(), sTo = range.to();
+    if (sFrom.line == sTo.line) {
+      drawForLine(sFrom.line, sFrom.ch, sTo.ch);
+    } else {
+      var fromLine = getLine(doc, sFrom.line), toLine = getLine(doc, sTo.line);
+      var singleVLine = visualLine(fromLine) == visualLine(toLine);
+      var leftEnd = drawForLine(sFrom.line, sFrom.ch, singleVLine ? fromLine.text.length + 1 : null).end;
+      var rightStart = drawForLine(sTo.line, singleVLine ? 0 : null, sTo.ch).start;
+      if (singleVLine) {
+        if (leftEnd.top < rightStart.top - 2) {
+          add(leftEnd.right, leftEnd.top, null, leftEnd.bottom);
+          add(leftSide, rightStart.top, rightStart.left, rightStart.bottom);
+        } else {
+          add(leftEnd.right, leftEnd.top, rightStart.left - leftEnd.right, leftEnd.bottom);
+        }
+      }
+      if (leftEnd.bottom < rightStart.top)
+        add(leftSide, leftEnd.bottom, null, rightStart.top);
+    }
+
+    output.appendChild(fragment);
+  }
+
+  // Cursor-blinking
+  function restartBlink(cm) {
+    if (!cm.state.focused) return;
+    var display = cm.display;
+    clearInterval(display.blinker);
+    var on = true;
+    display.cursorDiv.style.visibility = "";
+    if (cm.options.cursorBlinkRate > 0)
+      display.blinker = setInterval(function() {
+        display.cursorDiv.style.visibility = (on = !on) ? "" : "hidden";
+      }, cm.options.cursorBlinkRate);
+    else if (cm.options.cursorBlinkRate < 0)
+      display.cursorDiv.style.visibility = "hidden";
+  }
+
+  // HIGHLIGHT WORKER
+
+  function startWorker(cm, time) {
+    if (cm.doc.mode.startState && cm.doc.frontier < cm.display.viewTo)
+      cm.state.highlight.set(time, bind(highlightWorker, cm));
+  }
+
+  function highlightWorker(cm) {
+    var doc = cm.doc;
+    if (doc.frontier < doc.first) doc.frontier = doc.first;
+    if (doc.frontier >= cm.display.viewTo) return;
+    var end = +new Date + cm.options.workTime;
+    var state = copyState(doc.mode, getStateBefore(cm, doc.frontier));
+    var changedLines = [];
+
+    doc.iter(doc.frontier, Math.min(doc.first + doc.size, cm.display.viewTo + 500), function(line) {
+      if (doc.frontier >= cm.display.viewFrom) { // Visible
+        var oldStyles = line.styles, tooLong = line.text.length > cm.options.maxHighlightLength;
+        var highlighted = highlightLine(cm, line, tooLong ? copyState(doc.mode, state) : state, true);
+        line.styles = highlighted.styles;
+        var oldCls = line.styleClasses, newCls = highlighted.classes;
+        if (newCls) line.styleClasses = newCls;
+        else if (oldCls) line.styleClasses = null;
+        var ischange = !oldStyles || oldStyles.length != line.styles.length ||
+          oldCls != newCls && (!oldCls || !newCls || oldCls.bgClass != newCls.bgClass || oldCls.textClass != newCls.textClass);
+        for (var i = 0; !ischange && i < oldStyles.length; ++i) ischange = oldStyles[i] != line.styles[i];
+        if (ischange) changedLines.push(doc.frontier);
+        line.stateAfter = tooLong ? state : copyState(doc.mode, state);
+      } else {
+        if (line.text.length <= cm.options.maxHighlightLength)
+          processLine(cm, line.text, state);
+        line.stateAfter = doc.frontier % 5 == 0 ? copyState(doc.mode, state) : null;
+      }
+      ++doc.frontier;
+      if (+new Date > end) {
+        startWorker(cm, cm.options.workDelay);
+        return true;
+      }
+    });
+    if (changedLines.length) runInOp(cm, function() {
+      for (var i = 0; i < changedLines.length; i++)
+        regLineChange(cm, changedLines[i], "text");
+    });
+  }
+
+  // Finds the line to start with when starting a parse. Tries to
+  // find a line with a stateAfter, so that it can start with a
+  // valid state. If that fails, it returns the line with the
+  // smallest indentation, which tends to need the least context to
+  // parse correctly.
+  function findStartLine(cm, n, precise) {
+    var minindent, minline, doc = cm.doc;
+    var lim = precise ? -1 : n - (cm.doc.mode.innerMode ? 1000 : 100);
+    for (var search = n; search > lim; --search) {
+      if (search <= doc.first) return doc.first;
+      var line = getLine(doc, search - 1);
+      if (line.stateAfter && (!precise || search <= doc.frontier)) return search;
+      var indented = countColumn(line.text, null, cm.options.tabSize);
+      if (minline == null || minindent > indented) {
+        minline = search - 1;
+        minindent = indented;
+      }
+    }
+    return minline;
+  }
+
+  function getStateBefore(cm, n, precise) {
+    var doc = cm.doc, display = cm.display;
+    if (!doc.mode.startState) return true;
+    var pos = findStartLine(cm, n, precise), state = pos > doc.first && getLine(doc, pos-1).stateAfter;
+    if (!state) state = startState(doc.mode);
+    else state = copyState(doc.mode, state);
+    doc.iter(pos, n, function(line) {
+      processLine(cm, line.text, state);
+      var save = pos == n - 1 || pos % 5 == 0 || pos >= display.viewFrom && pos < display.viewTo;
+      line.stateAfter = save ? copyState(doc.mode, state) : null;
+      ++pos;
+    });
+    if (precise) doc.frontier = pos;
+    return state;
+  }
+
+  // POSITION MEASUREMENT
+
+  function paddingTop(display) {return display.lineSpace.offsetTop;}
+  function paddingVert(display) {return display.mover.offsetHeight - display.lineSpace.offsetHeight;}
+  function paddingH(display) {
+    if (display.cachedPaddingH) return display.cachedPaddingH;
+    var e = removeChildrenAndAdd(display.measure, elt("pre", "x"));
+    var style = window.getComputedStyle ? window.getComputedStyle(e) : e.currentStyle;
+    var data = {left: parseInt(style.paddingLeft), right: parseInt(style.paddingRight)};
+    if (!isNaN(data.left) && !isNaN(data.right)) display.cachedPaddingH = data;
+    return data;
+  }
+
+  function scrollGap(cm) { return scrollerGap - cm.display.nativeBarWidth; }
+  function displayWidth(cm) {
+    return cm.display.scroller.clientWidth - scrollGap(cm) - cm.display.barWidth;
+  }
+  function displayHeight(cm) {
+    return cm.display.scroller.clientHeight - scrollGap(cm) - cm.display.barHeight;
+  }
+
+  // Ensure the lineView.wrapping.heights array is populated. This is
+  // an array of bottom offsets for the lines that make up a drawn
+  // line. When lineWrapping is on, there might be more than one
+  // height.
+  function ensureLineHeights(cm, lineView, rect) {
+    var wrapping = cm.options.lineWrapping;
+    var curWidth = wrapping && displayWidth(cm);
+    if (!lineView.measure.heights || wrapping && lineView.measure.width != curWidth) {
+      var heights = lineView.measure.heights = [];
+      if (wrapping) {
+        lineView.measure.width = curWidth;
+        var rects = lineView.text.firstChild.getClientRects();
+        for (var i = 0; i < rects.length - 1; i++) {
+          var cur = rects[i], next = rects[i + 1];
+          if (Math.abs(cur.bottom - next.bottom) > 2)
+            heights.push((cur.bottom + next.top) / 2 - rect.top);
+        }
+      }
+      heights.push(rect.bottom - rect.top);
+    }
+  }
+
+  // Find a line map (mapping character offsets to text nodes) and a
+  // measurement cache for the given line number. (A line view might
+  // contain multiple lines when collapsed ranges are present.)
+  function mapFromLineView(lineView, line, lineN) {
+    if (lineView.line == line)
+      return {map: lineView.measure.map, cache: lineView.measure.cache};
+    for (var i = 0; i < lineView.rest.length; i++)
+      if (lineView.rest[i] == line)
+        return {map: lineView.measure.maps[i], cache: lineView.measure.caches[i]};
+    for (var i = 0; i < lineView.rest.length; i++)
+      if (lineNo(lineView.rest[i]) > lineN)
+        return {map: lineView.measure.maps[i], cache: lineView.measure.caches[i], before: true};
+  }
+
+  // Render a line into the hidden node display.externalMeasured. Used
+  // when measurement is needed for a line that's not in the viewport.
+  function updateExternalMeasurement(cm, line) {
+    line = visualLine(line);
+    var lineN = lineNo(line);
+    var view = cm.display.externalMeasured = new LineView(cm.doc, line, lineN);
+    view.lineN = lineN;
+    var built = view.built = buildLineContent(cm, view);
+    view.text = built.pre;
+    removeChildrenAndAdd(cm.display.lineMeasure, built.pre);
+    return view;
+  }
+
+  // Get a {top, bottom, left, right} box (in line-local coordinates)
+  // for a given character.
+  function measureChar(cm, line, ch, bias) {
+    return measureCharPrepared(cm, prepareMeasureForLine(cm, line), ch, bias);
+  }
+
+  // Find a line view that corresponds to the given line number.
+  function findViewForLine(cm, lineN) {
+    if (lineN >= cm.display.viewFrom && lineN < cm.display.viewTo)
+      return cm.display.view[findViewIndex(cm, lineN)];
+    var ext = cm.display.externalMeasured;
+    if (ext && lineN >= ext.lineN && lineN < ext.lineN + ext.size)
+      return ext;
+  }
+
+  // Measurement can be split in two steps, the set-up work that
+  // applies to the whole line, and the measurement of the actual
+  // character. Functions like coordsChar, that need to do a lot of
+  // measurements in a row, can thus ensure that the set-up work is
+  // only done once.
+  function prepareMeasureForLine(cm, line) {
+    var lineN = lineNo(line);
+    var view = findViewForLine(cm, lineN);
+    if (view && !view.text) {
+      view = null;
+    } else if (view && view.changes) {
+      updateLineForChanges(cm, view, lineN, getDimensions(cm));
+      cm.curOp.forceUpdate = true;
+    }
+    if (!view)
+      view = updateExternalMeasurement(cm, line);
+
+    var info = mapFromLineView(view, line, lineN);
+    return {
+      line: line, view: view, rect: null,
+      map: info.map, cache: info.cache, before: info.before,
+      hasHeights: false
+    };
+  }
+
+  // Given a prepared measurement object, measures the position of an
+  // actual character (or fetches it from the cache).
+  function measureCharPrepared(cm, prepared, ch, bias, varHeight) {
+    if (prepared.before) ch = -1;
+    var key = ch + (bias || ""), found;
+    if (prepared.cache.hasOwnProperty(key)) {
+      found = prepared.cache[key];
+    } else {
+      if (!prepared.rect)
+        prepared.rect = prepared.view.text.getBoundingClientRect();
+      if (!prepared.hasHeights) {
+        ensureLineHeights(cm, prepared.view, prepared.rect);
+        prepared.hasHeights = true;
+      }
+      found = measureCharInner(cm, prepared, ch, bias);
+      if (!found.bogus) prepared.cache[key] = found;
+    }
+    return {left: found.left, right: found.right,
+            top: varHeight ? found.rtop : found.top,
+            bottom: varHeight ? found.rbottom : found.bottom};
+  }
+
+  var nullRect = {left: 0, right: 0, top: 0, bottom: 0};
+
+  function nodeAndOffsetInLineMap(map, ch, bias) {
+    var node, start, end, collapse;
+    // First, search the line map for the text node corresponding to,
+    // or closest to, the target character.
+    for (var i = 0; i < map.length; i += 3) {
+      var mStart = map[i], mEnd = map[i + 1];
+      if (ch < mStart) {
+        start = 0; end = 1;
+        collapse = "left";
+      } else if (ch < mEnd) {
+        start = ch - mStart;
+        end = start + 1;
+      } else if (i == map.length - 3 || ch == mEnd && map[i + 3] > ch) {
+        end = mEnd - mStart;
+        start = end - 1;
+        if (ch >= mEnd) collapse = "right";
+      }
+      if (start != null) {
+        node = map[i + 2];
+        if (mStart == mEnd && bias == (node.insertLeft ? "left" : "right"))
+          collapse = bias;
+        if (bias == "left" && start == 0)
+          while (i && map[i - 2] == map[i - 3] && map[i - 1].insertLeft) {
+            node = map[(i -= 3) + 2];
+            collapse = "left";
+          }
+        if (bias == "right" && start == mEnd - mStart)
+          while (i < map.length - 3 && map[i + 3] == map[i + 4] && !map[i + 5].insertLeft) {
+            node = map[(i += 3) + 2];
+            collapse = "right";
+          }
+        break;
+      }
+    }
+    return {node: node, start: start, end: end, collapse: collapse, coverStart: mStart, coverEnd: mEnd};
+  }
+
+  function measureCharInner(cm, prepared, ch, bias) {
+    var place = nodeAndOffsetInLineMap(prepared.map, ch, bias);
+    var node = place.node, start = place.start, end = place.end, collapse = place.collapse;
+
+    var rect;
+    if (node.nodeType == 3) { // If it is a text node, use a range to retrieve the coordinates.
+      for (var i = 0; i < 4; i++) { // Retry a maximum of 4 times when nonsense rectangles are returned
+        while (start && isExtendingChar(prepared.line.text.charAt(place.coverStart + start))) --start;
+        while (place.coverStart + end < place.coverEnd && isExtendingChar(prepared.line.text.charAt(place.coverStart + end))) ++end;
+        if (ie && ie_version < 9 && start == 0 && end == place.coverEnd - place.coverStart) {
+          rect = node.parentNode.getBoundingClientRect();
+        } else if (ie && cm.options.lineWrapping) {
+          var rects = range(node, start, end).getClientRects();
+          if (rects.length)
+            rect = rects[bias == "right" ? rects.length - 1 : 0];
+          else
+            rect = nullRect;
+        } else {
+          rect = range(node, start, end).getBoundingClientRect() || nullRect;
+        }
+        if (rect.left || rect.right || start == 0) break;
+        end = start;
+        start = start - 1;
+        collapse = "right";
+      }
+      if (ie && ie_version < 11) rect = maybeUpdateRectForZooming(cm.display.measure, rect);
+    } else { // If it is a widget, simply get the box for the whole widget.
+      if (start > 0) collapse = bias = "right";
+      var rects;
+      if (cm.options.lineWrapping && (rects = node.getClientRects()).length > 1)
+        rect = rects[bias == "right" ? rects.length - 1 : 0];
+      else
+        rect = node.getBoundingClientRect();
+    }
+    if (ie && ie_version < 9 && !start && (!rect || !rect.left && !rect.right)) {
+      var rSpan = node.parentNode.getClientRects()[0];
+      if (rSpan)
+        rect = {left: rSpan.left, right: rSpan.left + charWidth(cm.display), top: rSpan.top, bottom: rSpan.bottom};
+      else
+        rect = nullRect;
+    }
+
+    var rtop = rect.top - prepared.rect.top, rbot = rect.bottom - prepared.rect.top;
+    var mid = (rtop + rbot) / 2;
+    var heights = prepared.view.measure.heights;
+    for (var i = 0; i < heights.length - 1; i++)
+      if (mid < heights[i]) break;
+    var top = i ? heights[i - 1] : 0, bot = heights[i];
+    var result = {left: (collapse == "right" ? rect.right : rect.left) - prepared.rect.left,
+                  right: (collapse == "left" ? rect.left : rect.right) - prepared.rect.left,
+                  top: top, bottom: bot};
+    if (!rect.left && !rect.right) result.bogus = true;
+    if (!cm.options.singleCursorHeightPerLine) { result.rtop = rtop; result.rbottom = rbot; }
+
+    return result;
+  }
+
+  // Work around problem with bounding client rects on ranges being
+  // returned incorrectly when zoomed on IE10 and below.
+  function maybeUpdateRectForZooming(measure, rect) {
+    if (!window.screen || screen.logicalXDPI == null ||
+        screen.logicalXDPI == screen.deviceXDPI || !hasBadZoomedRects(measure))
+      return rect;
+    var scaleX = screen.logicalXDPI / screen.deviceXDPI;
+    var scaleY = screen.logicalYDPI / screen.deviceYDPI;
+    return {left: rect.left * scaleX, right: rect.right * scaleX,
+            top: rect.top * scaleY, bottom: rect.bottom * scaleY};
+  }
+
+  function clearLineMeasurementCacheFor(lineView) {
+    if (lineView.measure) {
+      lineView.measure.cache = {};
+      lineView.measure.heights = null;
+      if (lineView.rest) for (var i = 0; i < lineView.rest.length; i++)
+        lineView.measure.caches[i] = {};
+    }
+  }
+
+  function clearLineMeasurementCache(cm) {
+    cm.display.externalMeasure = null;
+    removeChildren(cm.display.lineMeasure);
+    for (var i = 0; i < cm.display.view.length; i++)
+      clearLineMeasurementCacheFor(cm.display.view[i]);
+  }
+
+  function clearCaches(cm) {
+    clearLineMeasurementCache(cm);
+    cm.display.cachedCharWidth = cm.display.cachedTextHeight = cm.display.cachedPaddingH = null;
+    if (!cm.options.lineWrapping) cm.display.maxLineChanged = true;
+    cm.display.lineNumChars = null;
+  }
+
+  function pageScrollX() { return window.pageXOffset || (document.documentElement || document.body).scrollLeft; }
+  function pageScrollY() { return window.pageYOffset || (document.documentElement || document.body).scrollTop; }
+
+  // Converts a {top, bottom, left, right} box from line-local
+  // coordinates into another coordinate system. Context may be one of
+  // "line", "div" (display.lineDiv), "local"/null (editor), "window",
+  // or "page".
+  function intoCoordSystem(cm, lineObj, rect, context) {
+    if (lineObj.widgets) for (var i = 0; i < lineObj.widgets.length; ++i) if (lineObj.widgets[i].above) {
+      var size = widgetHeight(lineObj.widgets[i]);
+      rect.top += size; rect.bottom += size;
+    }
+    if (context == "line") return rect;
+    if (!context) context = "local";
+    var yOff = heightAtLine(lineObj);
+    if (context == "local") yOff += paddingTop(cm.display);
+    else yOff -= cm.display.viewOffset;
+    if (context == "page" || context == "window") {
+      var lOff = cm.display.lineSpace.getBoundingClientRect();
+      yOff += lOff.top + (context == "window" ? 0 : pageScrollY());
+      var xOff = lOff.left + (context == "window" ? 0 : pageScrollX());
+      rect.left += xOff; rect.right += xOff;
+    }
+    rect.top += yOff; rect.bottom += yOff;
+    return rect;
+  }
+
+  // Coverts a box from "div" coords to another coordinate system.
+  // Context may be "window", "page", "div", or "local"/null.
+  function fromCoordSystem(cm, coords, context) {
+    if (context == "div") return coords;
+    var left = coords.left, top = coords.top;
+    // First move into "page" coordinate system
+    if (context == "page") {
+      left -= pageScrollX();
+      top -= pageScrollY();
+    } else if (context == "local" || !context) {
+      var localBox = cm.display.sizer.getBoundingClientRect();
+      left += localBox.left;
+      top += localBox.top;
+    }
+
+    var lineSpaceBox = cm.display.lineSpace.getBoundingClientRect();
+    return {left: left - lineSpaceBox.left, top: top - lineSpaceBox.top};
+  }
+
+  function charCoords(cm, pos, context, lineObj, bias) {
+    if (!lineObj) lineObj = getLine(cm.doc, pos.line);
+    return intoCoordSystem(cm, lineObj, measureChar(cm, lineObj, pos.ch, bias), context);
+  }
+
+  // Returns a box for a given cursor position, which may have an
+  // 'other' property containing the position of the secondary cursor
+  // on a bidi boundary.
+  function cursorCoords(cm, pos, context, lineObj, preparedMeasure, varHeight) {
+    lineObj = lineObj || getLine(cm.doc, pos.line);
+    if (!preparedMeasure) preparedMeasure = prepareMeasureForLine(cm, lineObj);
+    function get(ch, right) {
+      var m = measureCharPrepared(cm, preparedMeasure, ch, right ? "right" : "left", varHeight);
+      if (right) m.left = m.right; else m.right = m.left;
+      return intoCoordSystem(cm, lineObj, m, context);
+    }
+    function getBidi(ch, partPos) {
+      var part = order[partPos], right = part.level % 2;
+      if (ch == bidiLeft(part) && partPos && part.level < order[partPos - 1].level) {
+        part = order[--partPos];
+        ch = bidiRight(part) - (part.level % 2 ? 0 : 1);
+        right = true;
+      } else if (ch == bidiRight(part) && partPos < order.length - 1 && part.level < order[partPos + 1].level) {
+        part = order[++partPos];
+        ch = bidiLeft(part) - part.level % 2;
+        right = false;
+      }
+      if (right && ch == part.to && ch > part.from) return get(ch - 1);
+      return get(ch, right);
+    }
+    var order = getOrder(lineObj), ch = pos.ch;
+    if (!order) return get(ch);
+    var partPos = getBidiPartAt(order, ch);
+    var val = getBidi(ch, partPos);
+    if (bidiOther != null) val.other = getBidi(ch, bidiOther);
+    return val;
+  }
+
+  // Used to cheaply estimate the coordinates for a position. Used for
+  // intermediate scroll updates.
+  function estimateCoords(cm, pos) {
+    var left = 0, pos = clipPos(cm.doc, pos);
+    if (!cm.options.lineWrapping) left = charWidth(cm.display) * pos.ch;
+    var lineObj = getLine(cm.doc, pos.line);
+    var top = heightAtLine(lineObj) + paddingTop(cm.display);
+    return {left: left, right: left, top: top, bottom: top + lineObj.height};
+  }
+
+  // Positions returned by coordsChar contain some extra information.
+  // xRel is the relative x position of the input coordinates compared
+  // to the found position (so xRel > 0 means the coordinates are to
+  // the right of the character position, for example). When outside
+  // is true, that means the coordinates lie outside the line's
+  // vertical range.
+  function PosWithInfo(line, ch, outside, xRel) {
+    var pos = Pos(line, ch);
+    pos.xRel = xRel;
+    if (outside) pos.outside = true;
+    return pos;
+  }
+
+  // Compute the character position closest to the given coordinates.
+  // Input must be lineSpace-local ("div" coordinate system).
+  function coordsChar(cm, x, y) {
+    var doc = cm.doc;
+    y += cm.display.viewOffset;
+    if (y < 0) return PosWithInfo(doc.first, 0, true, -1);
+    var lineN = lineAtHeight(doc, y), last = doc.first + doc.size - 1;
+    if (lineN > last)
+      return PosWithInfo(doc.first + doc.size - 1, getLine(doc, last).text.length, true, 1);
+    if (x < 0) x = 0;
+
+    var lineObj = getLine(doc, lineN);
+    for (;;) {
+      var found = coordsCharInner(cm, lineObj, lineN, x, y);
+      var merged = collapsedSpanAtEnd(lineObj);
+      var mergedPos = merged && merged.find(0, true);
+      if (merged && (found.ch > mergedPos.from.ch || found.ch == mergedPos.from.ch && found.xRel > 0))
+        lineN = lineNo(lineObj = mergedPos.to.line);
+      else
+        return found;
+    }
+  }
+
+  function coordsCharInner(cm, lineObj, lineNo, x, y) {
+    var innerOff = y - heightAtLine(lineObj);
+    var wrongLine = false, adjust = 2 * cm.display.wrapper.clientWidth;
+    var preparedMeasure = prepareMeasureForLine(cm, lineObj);
+
+    function getX(ch) {
+      var sp = cursorCoords(cm, Pos(lineNo, ch), "line", lineObj, preparedMeasure);
+      wrongLine = true;
+      if (innerOff > sp.bottom) return sp.left - adjust;
+      else if (innerOff < sp.top) return sp.left + adjust;
+      else wrongLine = false;
+      return sp.left;
+    }
+
+    var bidi = getOrder(lineObj), dist = lineObj.text.length;
+    var from = lineLeft(lineObj), to = lineRight(lineObj);
+    var fromX = getX(from), fromOutside = wrongLine, toX = getX(to), toOutside = wrongLine;
+
+    if (x > toX) return PosWithInfo(lineNo, to, toOutside, 1);
+    // Do a binary search between these bounds.
+    for (;;) {
+      if (bidi ? to == from || to == moveVisually(lineObj, from, 1) : to - from <= 1) {
+        var ch = x < fromX || x - fromX <= toX - x ? from : to;
+        var xDiff = x - (ch == from ? fromX : toX);
+        while (isExtendingChar(lineObj.text.charAt(ch))) ++ch;
+        var pos = PosWithInfo(lineNo, ch, ch == from ? fromOutside : toOutside,
+                              xDiff < -1 ? -1 : xDiff > 1 ? 1 : 0);
+        return pos;
+      }
+      var step = Math.ceil(dist / 2), middle = from + step;
+      if (bidi) {
+        middle = from;
+        for (var i = 0; i < step; ++i) middle = moveVisually(lineObj, middle, 1);
+      }
+      var middleX = getX(middle);
+      if (middleX > x) {to = middle; toX = middleX; if (toOutside = wrongLine) toX += 1000; dist = step;}
+      else {from = middle; fromX = middleX; fromOutside = wrongLine; dist -= step;}
+    }
+  }
+
+  var measureText;
+  // Compute the default text height.
+  function textHeight(display) {
+    if (display.cachedTextHeight != null) return display.cachedTextHeight;
+    if (measureText == null) {
+      measureText = elt("pre");
+      // Measure a bunch of lines, for browsers that compute
+      // fractional heights.
+      for (var i = 0; i < 49; ++i) {
+        measureText.appendChild(document.createTextNode("x"));
+        measureText.appendChild(elt("br"));
+      }
+      measureText.appendChild(document.createTextNode("x"));
+    }
+    removeChildrenAndAdd(display.measure, measureText);
+    var height = measureText.offsetHeight / 50;
+    if (height > 3) display.cachedTextHeight = height;
+    removeChildren(display.measure);
+    return height || 1;
+  }
+
+  // Compute the default character width.
+  function charWidth(display) {
+    if (display.cachedCharWidth != null) return display.cachedCharWidth;
+    var anchor = elt("span", "xxxxxxxxxx");
+    var pre = elt("pre", [anchor]);
+    removeChildrenAndAdd(display.measure, pre);
+    var rect = anchor.getBoundingClientRect(), width = (rect.right - rect.left) / 10;
+    if (width > 2) display.cachedCharWidth = width;
+    return width || 10;
+  }
+
+  // OPERATIONS
+
+  // Operations are used to wrap a series of changes to the editor
+  // state in such a way that each change won't have to update the
+  // cursor and display (which would be awkward, slow, and
+  // error-prone). Instead, display updates are batched and then all
+  // combined and executed at once.
+
+  var operationGroup = null;
+
+  var nextOpId = 0;
+  // Start a new operation.
+  function startOperation(cm) {
+    cm.curOp = {
+      cm: cm,
+      viewChanged: false,      // Flag that indicates that lines might need to be redrawn
+      startHeight: cm.doc.height, // Used to detect need to update scrollbar
+      forceUpdate: false,      // Used to force a redraw
+      updateInput: null,       // Whether to reset the input textarea
+      typing: false,           // Whether this reset should be careful to leave existing text (for compositing)
+      changeObjs: null,        // Accumulated changes, for firing change events
+      cursorActivityHandlers: null, // Set of handlers to fire cursorActivity on
+      cursorActivityCalled: 0, // Tracks which cursorActivity handlers have been called already
+      selectionChanged: false, // Whether the selection needs to be redrawn
+      updateMaxLine: false,    // Set when the widest line needs to be determined anew
+      scrollLeft: null, scrollTop: null, // Intermediate scroll position, not pushed to DOM yet
+      scrollToPos: null,       // Used to scroll to a specific position
+      focus: false,
+      id: ++nextOpId           // Unique ID
+    };
+    if (operationGroup) {
+      operationGroup.ops.push(cm.curOp);
+    } else {
+      cm.curOp.ownsGroup = operationGroup = {
+        ops: [cm.curOp],
+        delayedCallbacks: []
+      };
+    }
+  }
+
+  function fireCallbacksForOps(group) {
+    // Calls delayed callbacks and cursorActivity handlers until no
+    // new ones appear
+    var callbacks = group.delayedCallbacks, i = 0;
+    do {
+      for (; i < callbacks.length; i++)
+        callbacks[i].call(null);
+      for (var j = 0; j < group.ops.length; j++) {
+        var op = group.ops[j];
+        if (op.cursorActivityHandlers)
+          while (op.cursorActivityCalled < op.cursorActivityHandlers.length)
+            op.cursorActivityHandlers[op.cursorActivityCalled++].call(null, op.cm);
+      }
+    } while (i < callbacks.length);
+  }
+
+  // Finish an operation, updating the display and signalling delayed events
+  function endOperation(cm) {
+    var op = cm.curOp, group = op.ownsGroup;
+    if (!group) return;
+
+    try { fireCallbacksForOps(group); }
+    finally {
+      operationGroup = null;
+      for (var i = 0; i < group.ops.length; i++)
+        group.ops[i].cm.curOp = null;
+      endOperations(group);
+    }
+  }
+
+  // The DOM updates done when an operation finishes are batched so
+  // that the minimum number of relayouts are required.
+  function endOperations(group) {
+    var ops = group.ops;
+    for (var i = 0; i < ops.length; i++) // Read DOM
+      endOperation_R1(ops[i]);
+    for (var i = 0; i < ops.length; i++) // Write DOM (maybe)
+      endOperation_W1(ops[i]);
+    for (var i = 0; i < ops.length; i++) // Read DOM
+      endOperation_R2(ops[i]);
+    for (var i = 0; i < ops.length; i++) // Write DOM (maybe)
+      endOperation_W2(ops[i]);
+    for (var i = 0; i < ops.length; i++) // Read DOM
+      endOperation_finish(ops[i]);
+  }
+
+  function endOperation_R1(op) {
+    var cm = op.cm, display = cm.display;
+    maybeClipScrollbars(cm);
+    if (op.updateMaxLine) findMaxLine(cm);
+
+    op.mustUpdate = op.viewChanged || op.forceUpdate || op.scrollTop != null ||
+      op.scrollToPos && (op.scrollToPos.from.line < display.viewFrom ||
+                         op.scrollToPos.to.line >= display.viewTo) ||
+      display.maxLineChanged && cm.options.lineWrapping;
+    op.update = op.mustUpdate &&
+      new DisplayUpdate(cm, op.mustUpdate && {top: op.scrollTop, ensure: op.scrollToPos}, op.forceUpdate);
+  }
+
+  function endOperation_W1(op) {
+    op.updatedDisplay = op.mustUpdate && updateDisplayIfNeeded(op.cm, op.update);
+  }
+
+  function endOperation_R2(op) {
+    var cm = op.cm, display = cm.display;
+    if (op.updatedDisplay) updateHeightsInViewport(cm);
+
+    op.barMeasure = measureForScrollbars(cm);
+
+    // If the max line changed since it was last measured, measure it,
+    // and ensure the document's width matches it.
+    // updateDisplay_W2 will use these properties to do the actual resizing
+    if (display.maxLineChanged && !cm.options.lineWrapping) {
+      op.adjustWidthTo = measureChar(cm, display.maxLine, display.maxLine.text.length).left + 3;
+      cm.display.sizerWidth = op.adjustWidthTo;
+      op.barMeasure.scrollWidth =
+        Math.max(display.scroller.clientWidth, display.sizer.offsetLeft + op.adjustWidthTo + scrollGap(cm) + cm.display.barWidth);
+      op.maxScrollLeft = Math.max(0, display.sizer.offsetLeft + op.adjustWidthTo - displayWidth(cm));
+    }
+
+    if (op.updatedDisplay || op.selectionChanged)
+      op.preparedSelection = display.input.prepareSelection();
+  }
+
+  function endOperation_W2(op) {
+    var cm = op.cm;
+
+    if (op.adjustWidthTo != null) {
+      cm.display.sizer.style.minWidth = op.adjustWidthTo + "px";
+      if (op.maxScrollLeft < cm.doc.scrollLeft)
+        setScrollLeft(cm, Math.min(cm.display.scroller.scrollLeft, op.maxScrollLeft), true);
+      cm.display.maxLineChanged = false;
+    }
+
+    if (op.preparedSelection)
+      cm.display.input.showSelection(op.preparedSelection);
+    if (op.updatedDisplay)
+      setDocumentHeight(cm, op.barMeasure);
+    if (op.updatedDisplay || op.startHeight != cm.doc.height)
+      updateScrollbars(cm, op.barMeasure);
+
+    if (op.selectionChanged) restartBlink(cm);
+
+    if (cm.state.focused && op.updateInput)
+      cm.display.input.reset(op.typing);
+    if (op.focus && op.focus == activeElt()) ensureFocus(op.cm);
+  }
+
+  function endOperation_finish(op) {
+    var cm = op.cm, display = cm.display, doc = cm.doc;
+
+    if (op.updatedDisplay) postUpdateDisplay(cm, op.update);
+
+    // Abort mouse wheel delta measurement, when scrolling explicitly
+    if (display.wheelStartX != null && (op.scrollTop != null || op.scrollLeft != null || op.scrollToPos))
+      display.wheelStartX = display.wheelStartY = null;
+
+    // Propagate the scroll position to the actual DOM scroller
+    if (op.scrollTop != null && (display.scroller.scrollTop != op.scrollTop || op.forceScroll)) {
+      doc.scrollTop = Math.max(0, Math.min(display.scroller.scrollHeight - display.scroller.clientHeight, op.scrollTop));
+      display.scrollbars.setScrollTop(doc.scrollTop);
+      display.scroller.scrollTop = doc.scrollTop;
+    }
+    if (op.scrollLeft != null && (display.scroller.scrollLeft != op.scrollLeft || op.forceScroll)) {
+      doc.scrollLeft = Math.max(0, Math.min(display.scroller.scrollWidth - displayWidth(cm), op.scrollLeft));
+      display.scrollbars.setScrollLeft(doc.scrollLeft);
+      display.scroller.scrollLeft = doc.scrollLeft;
+      alignHorizontally(cm);
+    }
+    // If we need to scroll a specific position into view, do so.
+    if (op.scrollToPos) {
+      var coords = scrollPosIntoView(cm, clipPos(doc, op.scrollToPos.from),
+                                     clipPos(doc, op.scrollToPos.to), op.scrollToPos.margin);
+      if (op.scrollToPos.isCursor && cm.state.focused) maybeScrollWindow(cm, coords);
+    }
+
+    // Fire events for markers that are hidden/unidden by editing or
+    // undoing
+    var hidden = op.maybeHiddenMarkers, unhidden = op.maybeUnhiddenMarkers;
+    if (hidden) for (var i = 0; i < hidden.length; ++i)
+      if (!hidden[i].lines.length) signal(hidden[i], "hide");
+    if (unhidden) for (var i = 0; i < unhidden.length; ++i)
+      if (unhidden[i].lines.length) signal(unhidden[i], "unhide");
+
+    if (display.wrapper.offsetHeight)
+      doc.scrollTop = cm.display.scroller.scrollTop;
+
+    // Fire change events, and delayed event handlers
+    if (op.changeObjs)
+      signal(cm, "changes", cm, op.changeObjs);
+    if (op.update)
+      op.update.finish();
+  }
+
+  // Run the given function in an operation
+  function runInOp(cm, f) {
+    if (cm.curOp) return f();
+    startOperation(cm);
+    try { return f(); }
+    finally { endOperation(cm); }
+  }
+  // Wraps a function in an operation. Returns the wrapped function.
+  function operation(cm, f) {
+    return function() {
+      if (cm.curOp) return f.apply(cm, arguments);
+      startOperation(cm);
+      try { return f.apply(cm, arguments); }
+      finally { endOperation(cm); }
+    };
+  }
+  // Used to add methods to editor and doc instances, wrapping them in
+  // operations.
+  function methodOp(f) {
+    return function() {
+      if (this.curOp) return f.apply(this, arguments);
+      startOperation(this);
+      try { return f.apply(this, arguments); }
+      finally { endOperation(this); }
+    };
+  }
+  function docMethodOp(f) {
+    return function() {
+      var cm = this.cm;
+      if (!cm || cm.curOp) return f.apply(this, arguments);
+      startOperation(cm);
+      try { return f.apply(this, arguments); }
+      finally { endOperation(cm); }
+    };
+  }
+
+  // VIEW TRACKING
+
+  // These objects are used to represent the visible (currently drawn)
+  // part of the document. A LineView may correspond to multiple
+  // logical lines, if those are connected by collapsed ranges.
+  function LineView(doc, line, lineN) {
+    // The starting line
+    this.line = line;
+    // Continuing lines, if any
+    this.rest = visualLineContinued(line);
+    // Number of logical lines in this visual line
+    this.size = this.rest ? lineNo(lst(this.rest)) - lineN + 1 : 1;
+    this.node = this.text = null;
+    this.hidden = lineIsHidden(doc, line);
+  }
+
+  // Create a range of LineView objects for the given lines.
+  function buildViewArray(cm, from, to) {
+    var array = [], nextPos;
+    for (var pos = from; pos < to; pos = nextPos) {
+      var view = new LineView(cm.doc, getLine(cm.doc, pos), pos);
+      nextPos = pos + view.size;
+      array.push(view);
+    }
+    return array;
+  }
+
+  // Updates the display.view data structure for a given change to the
+  // document. From and to are in pre-change coordinates. Lendiff is
+  // the amount of lines added or subtracted by the change. This is
+  // used for changes that span multiple lines, or change the way
+  // lines are divided into visual lines. regLineChange (below)
+  // registers single-line changes.
+  function regChange(cm, from, to, lendiff) {
+    if (from == null) from = cm.doc.first;
+    if (to == null) to = cm.doc.first + cm.doc.size;
+    if (!lendiff) lendiff = 0;
+
+    var display = cm.display;
+    if (lendiff && to < display.viewTo &&
+        (display.updateLineNumbers == null || display.updateLineNumbers > from))
+      display.updateLineNumbers = from;
+
+    cm.curOp.viewChanged = true;
+
+    if (from >= display.viewTo) { // Change after
+      if (sawCollapsedSpans && visualLineNo(cm.doc, from) < display.viewTo)
+        resetView(cm);
+    } else if (to <= display.viewFrom) { // Change before
+      if (sawCollapsedSpans && visualLineEndNo(cm.doc, to + lendiff) > display.viewFrom) {
+        resetView(cm);
+      } else {
+        display.viewFrom += lendiff;
+        display.viewTo += lendiff;
+      }
+    } else if (from <= display.viewFrom && to >= display.viewTo) { // Full overlap
+      resetView(cm);
+    } else if (from <= display.viewFrom) { // Top overlap
+      var cut = viewCuttingPoint(cm, to, to + lendiff, 1);
+      if (cut) {
+        display.view = display.view.slice(cut.index);
+        display.viewFrom = cut.lineN;
+        display.viewTo += lendiff;
+      } else {
+        resetView(cm);
+      }
+    } else if (to >= display.viewTo) { // Bottom overlap
+      var cut = viewCuttingPoint(cm, from, from, -1);
+      if (cut) {
+        display.view = display.view.slice(0, cut.index);
+        display.viewTo = cut.lineN;
+      } else {
+        resetView(cm);
+      }
+    } else { // Gap in the middle
+      var cutTop = viewCuttingPoint(cm, from, from, -1);
+      var cutBot = viewCuttingPoint(cm, to, to + lendiff, 1);
+      if (cutTop && cutBot) {
+        display.view = display.view.slice(0, cutTop.index)
+          .concat(buildViewArray(cm, cutTop.lineN, cutBot.lineN))
+          .concat(display.view.slice(cutBot.index));
+        display.viewTo += lendiff;
+      } else {
+        resetView(cm);
+      }
+    }
+
+    var ext = display.externalMeasured;
+    if (ext) {
+      if (to < ext.lineN)
+        ext.lineN += lendiff;
+      else if (from < ext.lineN + ext.size)
+        display.externalMeasured = null;
+    }
+  }
+
+  // Register a change to a single line. Type must be one of "text",
+  // "gutter", "class", "widget"
+  function regLineChange(cm, line, type) {
+    cm.curOp.viewChanged = true;
+    var display = cm.display, ext = cm.display.externalMeasured;
+    if (ext && line >= ext.lineN && line < ext.lineN + ext.size)
+      display.externalMeasured = null;
+
+    if (line < display.viewFrom || line >= display.viewTo) return;
+    var lineView = display.view[findViewIndex(cm, line)];
+    if (lineView.node == null) return;
+    var arr = lineView.changes || (lineView.changes = []);
+    if (indexOf(arr, type) == -1) arr.push(type);
+  }
+
+  // Clear the view.
+  function resetView(cm) {
+    cm.display.viewFrom = cm.display.viewTo = cm.doc.first;
+    cm.display.view = [];
+    cm.display.viewOffset = 0;
+  }
+
+  // Find the view element corresponding to a given line. Return null
+  // when the line isn't visible.
+  function findViewIndex(cm, n) {
+    if (n >= cm.display.viewTo) return null;
+    n -= cm.display.viewFrom;
+    if (n < 0) return null;
+    var view = cm.display.view;
+    for (var i = 0; i < view.length; i++) {
+      n -= view[i].size;
+      if (n < 0) return i;
+    }
+  }
+
+  function viewCuttingPoint(cm, oldN, newN, dir) {
+    var index = findViewIndex(cm, oldN), diff, view = cm.display.view;
+    if (!sawCollapsedSpans || newN == cm.doc.first + cm.doc.size)
+      return {index: index, lineN: newN};
+    for (var i = 0, n = cm.display.viewFrom; i < index; i++)
+      n += view[i].size;
+    if (n != oldN) {
+      if (dir > 0) {
+        if (index == view.length - 1) return null;
+        diff = (n + view[index].size) - oldN;
+        index++;
+      } else {
+        diff = n - oldN;
+      }
+      oldN += diff; newN += diff;
+    }
+    while (visualLineNo(cm.doc, newN) != newN) {
+      if (index == (dir < 0 ? 0 : view.length - 1)) return null;
+      newN += dir * view[index - (dir < 0 ? 1 : 0)].size;
+      index += dir;
+    }
+    return {index: index, lineN: newN};
+  }
+
+  // Force the view to cover a given range, adding empty view element
+  // or clipping off existing ones as needed.
+  function adjustView(cm, from, to) {
+    var display = cm.display, view = display.view;
+    if (view.length == 0 || from >= display.viewTo || to <= display.viewFrom) {
+      display.view = buildViewArray(cm, from, to);
+      display.viewFrom = from;
+    } else {
+      if (display.viewFrom > from)
+        display.view = buildViewArray(cm, from, display.viewFrom).concat(display.view);
+      else if (display.viewFrom < from)
+        display.view = display.view.slice(findViewIndex(cm, from));
+      display.viewFrom = from;
+      if (display.viewTo < to)
+        display.view = display.view.concat(buildViewArray(cm, display.viewTo, to));
+      else if (display.viewTo > to)
+        display.view = display.view.slice(0, findViewIndex(cm, to));
+    }
+    display.viewTo = to;
+  }
+
+  // Count the number of lines in the view whose DOM representation is
+  // out of date (or nonexistent).
+  function countDirtyView(cm) {
+    var view = cm.display.view, dirty = 0;
+    for (var i = 0; i < view.length; i++) {
+      var lineView = view[i];
+      if (!lineView.hidden && (!lineView.node || lineView.changes)) ++dirty;
+    }
+    return dirty;
+  }
+
+  // EVENT HANDLERS
+
+  // Attach the necessary event handlers when initializing the editor
+  function registerEventHandlers(cm) {
+    var d = cm.display;
+    on(d.scroller, "mousedown", operation(cm, onMouseDown));
+    // Older IE's will not fire a second mousedown for a double click
+    if (ie && ie_version < 11)
+      on(d.scroller, "dblclick", operation(cm, function(e) {
+        if (signalDOMEvent(cm, e)) return;
+        var pos = posFromMouse(cm, e);
+        if (!pos || clickInGutter(cm, e) || eventInWidget(cm.display, e)) return;
+        e_preventDefault(e);
+        var word = cm.findWordAt(pos);
+        extendSelection(cm.doc, word.anchor, word.head);
+      }));
+    else
+      on(d.scroller, "dblclick", function(e) { signalDOMEvent(cm, e) || e_preventDefault(e); });
+    // Some browsers fire contextmenu *after* opening the menu, at
+    // which point we can't mess with it anymore. Context menu is
+    // handled in onMouseDown for these browsers.
+    if (!captureRightClick) on(d.scroller, "contextmenu", function(e) {onContextMenu(cm, e);});
+
+    // Used to suppress mouse event handling when a touch happens
+    var touchFinished, prevTouch = {end: 0};
+    function finishTouch() {
+      if (d.activeTouch) {
+        touchFinished = setTimeout(function() {d.activeTouch = null;}, 1000);
+        prevTouch = d.activeTouch;
+        prevTouch.end = +new Date;
+      }
+    };
+    function isMouseLikeTouchEvent(e) {
+      if (e.touches.length != 1) return false;
+      var touch = e.touches[0];
+      return touch.radiusX <= 1 && touch.radiusY <= 1;
+    }
+    function farAway(touch, other) {
+      if (other.left == null) return true;
+      var dx = other.left - touch.left, dy = other.top - touch.top;
+      return dx * dx + dy * dy > 20 * 20;
+    }
+    on(d.scroller, "touchstart", function(e) {
+      if (!isMouseLikeTouchEvent(e)) {
+        clearTimeout(touchFinished);
+        var now = +new Date;
+        d.activeTouch = {start: now, moved: false,
+                         prev: now - prevTouch.end <= 300 ? prevTouch : null};
+        if (e.touches.length == 1) {
+          d.activeTouch.left = e.touches[0].pageX;
+          d.activeTouch.top = e.touches[0].pageY;
+        }
+      }
+    });
+    on(d.scroller, "touchmove", function() {
+      if (d.activeTouch) d.activeTouch.moved = true;
+    });
+    on(d.scroller, "touchend", function(e) {
+      var touch = d.activeTouch;
+      if (touch && !eventInWidget(d, e) && touch.left != null &&
+          !touch.moved && new Date - touch.start < 300) {
+        var pos = cm.coordsChar(d.activeTouch, "page"), range;
+        if (!touch.prev || farAway(touch, touch.prev)) // Single tap
+          range = new Range(pos, pos);
+        else if (!touch.prev.prev || farAway(touch, touch.prev.prev)) // Double tap
+          range = cm.findWordAt(pos);
+        else // Triple tap
+          range = new Range(Pos(pos.line, 0), clipPos(cm.doc, Pos(pos.line + 1, 0)));
+        cm.setSelection(range.anchor, range.head);
+        cm.focus();
+        e_preventDefault(e);
+      }
+      finishTouch();
+    });
+    on(d.scroller, "touchcancel", finishTouch);
+
+    // Sync scrolling between fake scrollbars and real scrollable
+    // area, ensure viewport is updated when scrolling.
+    on(d.scroller, "scroll", function() {
+      if (d.scroller.clientHeight) {
+        setScrollTop(cm, d.scroller.scrollTop);
+        setScrollLeft(cm, d.scroller.scrollLeft, true);
+        signal(cm, "scroll", cm);
+      }
+    });
+
+    // Listen to wheel events in order to try and update the viewport on time.
+    on(d.scroller, "mousewheel", function(e){onScrollWheel(cm, e);});
+    on(d.scroller, "DOMMouseScroll", function(e){onScrollWheel(cm, e);});
+
+    // Prevent wrapper from ever scrolling
+    on(d.wrapper, "scroll", function() { d.wrapper.scrollTop = d.wrapper.scrollLeft = 0; });
+
+    d.dragFunctions = {
+      enter: function(e) {if (!signalDOMEvent(cm, e)) e_stop(e);},
+      over: function(e) {if (!signalDOMEvent(cm, e)) { onDragOver(cm, e); e_stop(e); }},
+      start: function(e){onDragStart(cm, e);},
+      drop: operation(cm, onDrop),
+      leave: function() {clearDragCursor(cm);}
+    };
+
+    var inp = d.input.getField();
+    on(inp, "keyup", function(e) { onKeyUp.call(cm, e); });
+    on(inp, "keydown", operation(cm, onKeyDown));
+    on(inp, "keypress", operation(cm, onKeyPress));
+    on(inp, "focus", bind(onFocus, cm));
+    on(inp, "blur", bind(onBlur, cm));
+  }
+
+  function dragDropChanged(cm, value, old) {
+    var wasOn = old && old != CodeMirror.Init;
+    if (!value != !wasOn) {
+      var funcs = cm.display.dragFunctions;
+      var toggle = value ? on : off;
+      toggle(cm.display.scroller, "dragstart", funcs.start);
+      toggle(cm.display.scroller, "dragenter", funcs.enter);
+      toggle(cm.display.scroller, "dragover", funcs.over);
+      toggle(cm.display.scroller, "dragleave", funcs.leave);
+      toggle(cm.display.scroller, "drop", funcs.drop);
+    }
+  }
+
+  // Called when the window resizes
+  function onResize(cm) {
+    var d = cm.display;
+    if (d.lastWrapHeight == d.wrapper.clientHeight && d.lastWrapWidth == d.wrapper.clientWidth)
+      return;
+    // Might be a text scaling operation, clear size caches.
+    d.cachedCharWidth = d.cachedTextHeight = d.cachedPaddingH = null;
+    d.scrollbarsClipped = false;
+    cm.setSize();
+  }
+
+  // MOUSE EVENTS
+
+  // Return true when the given mouse event happened in a widget
+  function eventInWidget(display, e) {
+    for (var n = e_target(e); n != display.wrapper; n = n.parentNode) {
+      if (!n || (n.nodeType == 1 && n.getAttribute("cm-ignore-events") == "true") ||
+          (n.parentNode == display.sizer && n != display.mover))
+        return true;
+    }
+  }
+
+  // Given a mouse event, find the corresponding position. If liberal
+  // is false, it checks whether a gutter or scrollbar was clicked,
+  // and returns null if it was. forRect is used by rectangular
+  // selections, and tries to estimate a character position even for
+  // coordinates beyond the right of the text.
+  function posFromMouse(cm, e, liberal, forRect) {
+    var display = cm.display;
+    if (!liberal && e_target(e).getAttribute("cm-not-content") == "true") return null;
+
+    var x, y, space = display.lineSpace.getBoundingClientRect();
+    // Fails unpredictably on IE[67] when mouse is dragged around quickly.
+    try { x = e.clientX - space.left; y = e.clientY - space.top; }
+    catch (e) { return null; }
+    var coords = coordsChar(cm, x, y), line;
+    if (forRect && coords.xRel == 1 && (line = getLine(cm.doc, coords.line).text).length == coords.ch) {
+      var colDiff = countColumn(line, line.length, cm.options.tabSize) - line.length;
+      coords = Pos(coords.line, Math.max(0, Math.round((x - paddingH(cm.display).left) / charWidth(cm.display)) - colDiff));
+    }
+    return coords;
+  }
+
+  // A mouse down can be a single click, double click, triple click,
+  // start of selection drag, start of text drag, new cursor
+  // (ctrl-click), rectangle drag (alt-drag), or xwin
+  // middle-click-paste. Or it might be a click on something we should
+  // not interfere with, such as a scrollbar or widget.
+  function onMouseDown(e) {
+    var cm = this, display = cm.display;
+    if (display.activeTouch && display.input.supportsTouch() || signalDOMEvent(cm, e)) return;
+    display.shift = e.shiftKey;
+
+    if (eventInWidget(display, e)) {
+      if (!webkit) {
+        // Briefly turn off draggability, to allow widgets to do
+        // normal dragging things.
+        display.scroller.draggable = false;
+        setTimeout(function(){display.scroller.draggable = true;}, 100);
+      }
+      return;
+    }
+    if (clickInGutter(cm, e)) return;
+    var start = posFromMouse(cm, e);
+    window.focus();
+
+    switch (e_button(e)) {
+    case 1:
+      // #3261: make sure, that we're not starting a second selection
+      if (cm.state.selectingText)
+        cm.state.selectingText(e);
+      else if (start)
+        leftButtonDown(cm, e, start);
+      else if (e_target(e) == display.scroller)
+        e_preventDefault(e);
+      break;
+    case 2:
+      if (webkit) cm.state.lastMiddleDown = +new Date;
+      if (start) extendSelection(cm.doc, start);
+      setTimeout(function() {display.input.focus();}, 20);
+      e_preventDefault(e);
+      break;
+    case 3:
+      if (captureRightClick) onContextMenu(cm, e);
+      else delayBlurEvent(cm);
+      break;
+    }
+  }
+
+  var lastClick, lastDoubleClick;
+  function leftButtonDown(cm, e, start) {
+    if (ie) setTimeout(bind(ensureFocus, cm), 0);
+    else cm.curOp.focus = activeElt();
+
+    var now = +new Date, type;
+    if (lastDoubleClick && lastDoubleClick.time > now - 400 && cmp(lastDoubleClick.pos, start) == 0) {
+      type = "triple";
+    } else if (lastClick && lastClick.time > now - 400 && cmp(lastClick.pos, start) == 0) {
+      type = "double";
+      lastDoubleClick = {time: now, pos: start};
+    } else {
+      type = "single";
+      lastClick = {time: now, pos: start};
+    }
+
+    var sel = cm.doc.sel, modifier = mac ? e.metaKey : e.ctrlKey, contained;
+    if (cm.options.dragDrop && dragAndDrop && !isReadOnly(cm) &&
+        type == "single" && (contained = sel.contains(start)) > -1 &&
+        (cmp((contained = sel.ranges[contained]).from(), start) < 0 || start.xRel > 0) &&
+        (cmp(contained.to(), start) > 0 || start.xRel < 0))
+      leftButtonStartDrag(cm, e, start, modifier);
+    else
+      leftButtonSelect(cm, e, start, type, modifier);
+  }
+
+  // Start a text drag. When it ends, see if any dragging actually
+  // happen, and treat as a click if it didn't.
+  function leftButtonStartDrag(cm, e, start, modifier) {
+    var display = cm.display, startTime = +new Date;
+    var dragEnd = operation(cm, function(e2) {
+      if (webkit) display.scroller.draggable = false;
+      cm.state.draggingText = false;
+      off(document, "mouseup", dragEnd);
+      off(display.scroller, "drop", dragEnd);
+      if (Math.abs(e.clientX - e2.clientX) + Math.abs(e.clientY - e2.clientY) < 10) {
+        e_preventDefault(e2);
+        if (!modifier && +new Date - 200 < startTime)
+          extendSelection(cm.doc, start);
+        // Work around unexplainable focus problem in IE9 (#2127) and Chrome (#3081)
+        if (webkit || ie && ie_version == 9)
+          setTimeout(function() {document.body.focus(); display.input.focus();}, 20);
+        else
+          display.input.focus();
+      }
+    });
+    // Let the drag handler handle this.
+    if (webkit) display.scroller.draggable = true;
+    cm.state.draggingText = dragEnd;
+    // IE's approach to draggable
+    if (display.scroller.dragDrop) display.scroller.dragDrop();
+    on(document, "mouseup", dragEnd);
+    on(display.scroller, "drop", dragEnd);
+  }
+
+  // Normal selection, as opposed to text dragging.
+  function leftButtonSelect(cm, e, start, type, addNew) {
+    var display = cm.display, doc = cm.doc;
+    e_preventDefault(e);
+
+    var ourRange, ourIndex, startSel = doc.sel, ranges = startSel.ranges;
+    if (addNew && !e.shiftKey) {
+      ourIndex = doc.sel.contains(start);
+      if (ourIndex > -1)
+        ourRange = ranges[ourIndex];
+      else
+        ourRange = new Range(start, start);
+    } else {
+      ourRange = doc.sel.primary();
+      ourIndex = doc.sel.primIndex;
+    }
+
+    if (e.altKey) {
+      type = "rect";
+      if (!addNew) ourRange = new Range(start, start);
+      start = posFromMouse(cm, e, true, true);
+      ourIndex = -1;
+    } else if (type == "double") {
+      var word = cm.findWordAt(start);
+      if (cm.display.shift || doc.extend)
+        ourRange = extendRange(doc, ourRange, word.anchor, word.head);
+      else
+        ourRange = word;
+    } else if (type == "triple") {
+      var line = new Range(Pos(start.line, 0), clipPos(doc, Pos(start.line + 1, 0)));
+      if (cm.display.shift || doc.extend)
+        ourRange = extendRange(doc, ourRange, line.anchor, line.head);
+      else
+        ourRange = line;
+    } else {
+      ourRange = extendRange(doc, ourRange, start);
+    }
+
+    if (!addNew) {
+      ourIndex = 0;
+      setSelection(doc, new Selection([ourRange], 0), sel_mouse);
+      startSel = doc.sel;
+    } else if (ourIndex == -1) {
+      ourIndex = ranges.length;
+      setSelection(doc, normalizeSelection(ranges.concat([ourRange]), ourIndex),
+                   {scroll: false, origin: "*mouse"});
+    } else if (ranges.length > 1 && ranges[ourIndex].empty() && type == "single" && !e.shiftKey) {
+      setSelection(doc, normalizeSelection(ranges.slice(0, ourIndex).concat(ranges.slice(ourIndex + 1)), 0),
+                   {scroll: false, origin: "*mouse"});
+      startSel = doc.sel;
+    } else {
+      replaceOneSelection(doc, ourIndex, ourRange, sel_mouse);
+    }
+
+    var lastPos = start;
+    function extendTo(pos) {
+      if (cmp(lastPos, pos) == 0) return;
+      lastPos = pos;
+
+      if (type == "rect") {
+        var ranges = [], tabSize = cm.options.tabSize;
+        var startCol = countColumn(getLine(doc, start.line).text, start.ch, tabSize);
+        var posCol = countColumn(getLine(doc, pos.line).text, pos.ch, tabSize);
+        var left = Math.min(startCol, posCol), right = Math.max(startCol, posCol);
+        for (var line = Math.min(start.line, pos.line), end = Math.min(cm.lastLine(), Math.max(start.line, pos.line));
+             line <= end; line++) {
+          var text = getLine(doc, line).text, leftPos = findColumn(text, left, tabSize);
+          if (left == right)
+            ranges.push(new Range(Pos(line, leftPos), Pos(line, leftPos)));
+          else if (text.length > leftPos)
+            ranges.push(new Range(Pos(line, leftPos), Pos(line, findColumn(text, right, tabSize))));
+        }
+        if (!ranges.length) ranges.push(new Range(start, start));
+        setSelection(doc, normalizeSelection(startSel.ranges.slice(0, ourIndex).concat(ranges), ourIndex),
+                     {origin: "*mouse", scroll: false});
+        cm.scrollIntoView(pos);
+      } else {
+        var oldRange = ourRange;
+        var anchor = oldRange.anchor, head = pos;
+        if (type != "single") {
+          if (type == "double")
+            var range = cm.findWordAt(pos);
+          else
+            var range = new Range(Pos(pos.line, 0), clipPos(doc, Pos(pos.line + 1, 0)));
+          if (cmp(range.anchor, anchor) > 0) {
+            head = range.head;
+            anchor = minPos(oldRange.from(), range.anchor);
+          } else {
+            head = range.anchor;
+            anchor = maxPos(oldRange.to(), range.head);
+          }
+        }
+        var ranges = startSel.ranges.slice(0);
+        ranges[ourIndex] = new Range(clipPos(doc, anchor), head);
+        setSelection(doc, normalizeSelection(ranges, ourIndex), sel_mouse);
+      }
+    }
+
+    var editorSize = display.wrapper.getBoundingClientRect();
+    // Used to ensure timeout re-tries don't fire when another extend
+    // happened in the meantime (clearTimeout isn't reliable -- at
+    // least on Chrome, the timeouts still happen even when cleared,
+    // if the clear happens after their scheduled firing time).
+    var counter = 0;
+
+    function extend(e) {
+      var curCount = ++counter;
+      var cur = posFromMouse(cm, e, true, type == "rect");
+      if (!cur) return;
+      if (cmp(cur, lastPos) != 0) {
+        cm.curOp.focus = activeElt();
+        extendTo(cur);
+        var visible = visibleLines(display, doc);
+        if (cur.line >= visible.to || cur.line < visible.from)
+          setTimeout(operation(cm, function(){if (counter == curCount) extend(e);}), 150);
+      } else {
+        var outside = e.clientY < editorSize.top ? -20 : e.clientY > editorSize.bottom ? 20 : 0;
+        if (outside) setTimeout(operation(cm, function() {
+          if (counter != curCount) return;
+          display.scroller.scrollTop += outside;
+          extend(e);
+        }), 50);
+      }
+    }
+
+    function done(e) {
+      cm.state.selectingText = false;
+      counter = Infinity;
+      e_preventDefault(e);
+      display.input.focus();
+      off(document, "mousemove", move);
+      off(document, "mouseup", up);
+      doc.history.lastSelOrigin = null;
+    }
+
+    var move = operation(cm, function(e) {
+      if (!e_button(e)) done(e);
+      else extend(e);
+    });
+    var up = operation(cm, done);
+    cm.state.selectingText = up;
+    on(document, "mousemove", move);
+    on(document, "mouseup", up);
+  }
+
+  // Determines whether an event happened in the gutter, and fires the
+  // handlers for the corresponding event.
+  function gutterEvent(cm, e, type, prevent, signalfn) {
+    try { var mX = e.clientX, mY = e.clientY; }
+    catch(e) { return false; }
+    if (mX >= Math.floor(cm.display.gutters.getBoundingClientRect().right)) return false;
+    if (prevent) e_preventDefault(e);
+
+    var display = cm.display;
+    var lineBox = display.lineDiv.getBoundingClientRect();
+
+    if (mY > lineBox.bottom || !hasHandler(cm, type)) return e_defaultPrevented(e);
+    mY -= lineBox.top - display.viewOffset;
+
+    for (var i = 0; i < cm.options.gutters.length; ++i) {
+      var g = display.gutters.childNodes[i];
+      if (g && g.getBoundingClientRect().right >= mX) {
+        var line = lineAtHeight(cm.doc, mY);
+        var gutter = cm.options.gutters[i];
+        signalfn(cm, type, cm, line, gutter, e);
+        return e_defaultPrevented(e);
+      }
+    }
+  }
+
+  function clickInGutter(cm, e) {
+    return gutterEvent(cm, e, "gutterClick", true, signalLater);
+  }
+
+  // Kludge to work around strange IE behavior where it'll sometimes
+  // re-fire a series of drag-related events right after the drop (#1551)
+  var lastDrop = 0;
+
+  function onDrop(e) {
+    var cm = this;
+    clearDragCursor(cm);
+    if (signalDOMEvent(cm, e) || eventInWidget(cm.display, e))
+      return;
+    e_preventDefault(e);
+    if (ie) lastDrop = +new Date;
+    var pos = posFromMouse(cm, e, true), files = e.dataTransfer.files;
+    if (!pos || isReadOnly(cm)) return;
+    // Might be a file drop, in which case we simply extract the text
+    // and insert it.
+    if (files && files.length && window.FileReader && window.File) {
+      var n = files.length, text = Array(n), read = 0;
+      var loadFile = function(file, i) {
+        var reader = new FileReader;
+        reader.onload = operation(cm, function() {
+          text[i] = reader.result;
+          if (++read == n) {
+            pos = clipPos(cm.doc, pos);
+            var change = {from: pos, to: pos,
+                          text: cm.doc.splitLines(text.join(cm.doc.lineSeparator())),
+                          origin: "paste"};
+            makeChange(cm.doc, change);
+            setSelectionReplaceHistory(cm.doc, simpleSelection(pos, changeEnd(change)));
+          }
+        });
+        reader.readAsText(file);
+      };
+      for (var i = 0; i < n; ++i) loadFile(files[i], i);
+    } else { // Normal drop
+      // Don't do a replace if the drop happened inside of the selected text.
+      if (cm.state.draggingText && cm.doc.sel.contains(pos) > -1) {
+        cm.state.draggingText(e);
+        // Ensure the editor is re-focused
+        setTimeout(function() {cm.display.input.focus();}, 20);
+        return;
+      }
+      try {
+        var text = e.dataTransfer.getData("Text");
+        if (text) {
+          if (cm.state.draggingText && !(mac ? e.altKey : e.ctrlKey))
+            var selected = cm.listSelections();
+          setSelectionNoUndo(cm.doc, simpleSelection(pos, pos));
+          if (selected) for (var i = 0; i < selected.length; ++i)
+            replaceRange(cm.doc, "", selected[i].anchor, selected[i].head, "drag");
+          cm.replaceSelection(text, "around", "paste");
+          cm.display.input.focus();
+        }
+      }
+      catch(e){}
+    }
+  }
+
+  function onDragStart(cm, e) {
+    if (ie && (!cm.state.draggingText || +new Date - lastDrop < 100)) { e_stop(e); return; }
+    if (signalDOMEvent(cm, e) || eventInWidget(cm.display, e)) return;
+
+    e.dataTransfer.setData("Text", cm.getSelection());
+
+    // Use dummy image instead of default browsers image.
+    // Recent Safari (~6.0.2) have a tendency to segfault when this happens, so we don't do it there.
+    if (e.dataTransfer.setDragImage && !safari) {
+      var img = elt("img", null, null, "position: fixed; left: 0; top: 0;");
+      img.src = "data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==";
+      if (presto) {
+        img.width = img.height = 1;
+        cm.display.wrapper.appendChild(img);
+        // Force a relayout, or Opera won't use our image for some obscure reason
+        img._top = img.offsetTop;
+      }
+      e.dataTransfer.setDragImage(img, 0, 0);
+      if (presto) img.parentNode.removeChild(img);
+    }
+  }
+
+  function onDragOver(cm, e) {
+    var pos = posFromMouse(cm, e);
+    if (!pos) return;
+    var frag = document.createDocumentFragment();
+    drawSelectionCursor(cm, pos, frag);
+    if (!cm.display.dragCursor) {
+      cm.display.dragCursor = elt("div", null, "CodeMirror-cursors CodeMirror-dragcursors");
+      cm.display.lineSpace.insertBefore(cm.display.dragCursor, cm.display.cursorDiv);
+    }
+    removeChildrenAndAdd(cm.display.dragCursor, frag);
+  }
+
+  function clearDragCursor(cm) {
+    if (cm.display.dragCursor) {
+      cm.display.lineSpace.removeChild(cm.display.dragCursor);
+      cm.display.dragCursor = null;
+    }
+  }
+
+  // SCROLL EVENTS
+
+  // Sync the scrollable area and scrollbars, ensure the viewport
+  // covers the visible area.
+  function setScrollTop(cm, val) {
+    if (Math.abs(cm.doc.scrollTop - val) < 2) return;
+    cm.doc.scrollTop = val;
+    if (!gecko) updateDisplaySimple(cm, {top: val});
+    if (cm.display.scroller.scrollTop != val) cm.display.scroller.scrollTop = val;
+    cm.display.scrollbars.setScrollTop(val);
+    if (gecko) updateDisplaySimple(cm);
+    startWorker(cm, 100);
+  }
+  // Sync scroller and scrollbar, ensure the gutter elements are
+  // aligned.
+  function setScrollLeft(cm, val, isScroller) {
+    if (isScroller ? val == cm.doc.scrollLeft : Math.abs(cm.doc.scrollLeft - val) < 2) return;
+    val = Math.min(val, cm.display.scroller.scrollWidth - cm.display.scroller.clientWidth);
+    cm.doc.scrollLeft = val;
+    alignHorizontally(cm);
+    if (cm.display.scroller.scrollLeft != val) cm.display.scroller.scrollLeft = val;
+    cm.display.scrollbars.setScrollLeft(val);
+  }
+
+  // Since the delta values reported on mouse wheel events are
+  // unstandardized between browsers and even browser versions, and
+  // generally horribly unpredictable, this code starts by measuring
+  // the scroll effect that the first few mouse wheel events have,
+  // and, from that, detects the way it can convert deltas to pixel
+  // offsets afterwards.
+  //
+  // The reason we want to know the amount a wheel event will scroll
+  // is that it gives us a chance to update the display before the
+  // actual scrolling happens, reducing flickering.
+
+  var wheelSamples = 0, wheelPixelsPerUnit = null;
+  // Fill in a browser-detected starting value on browsers where we
+  // know one. These don't have to be accurate -- the result of them
+  // being wrong would just be a slight flicker on the first wheel
+  // scroll (if it is large enough).
+  if (ie) wheelPixelsPerUnit = -.53;
+  else if (gecko) wheelPixelsPerUnit = 15;
+  else if (chrome) wheelPixelsPerUnit = -.7;
+  else if (safari) wheelPixelsPerUnit = -1/3;
+
+  var wheelEventDelta = function(e) {
+    var dx = e.wheelDeltaX, dy = e.wheelDeltaY;
+    if (dx == null && e.detail && e.axis == e.HORIZONTAL_AXIS) dx = e.detail;
+    if (dy == null && e.detail && e.axis == e.VERTICAL_AXIS) dy = e.detail;
+    else if (dy == null) dy = e.wheelDelta;
+    return {x: dx, y: dy};
+  };
+  CodeMirror.wheelEventPixels = function(e) {
+    var delta = wheelEventDelta(e);
+    delta.x *= wheelPixelsPerUnit;
+    delta.y *= wheelPixelsPerUnit;
+    return delta;
+  };
+
+  function onScrollWheel(cm, e) {
+    var delta = wheelEventDelta(e), dx = delta.x, dy = delta.y;
+
+    var display = cm.display, scroll = display.scroller;
+    // Quit if there's nothing to scroll here
+    if (!(dx && scroll.scrollWidth > scroll.clientWidth ||
+          dy && scroll.scrollHeight > scroll.clientHeight)) return;
+
+    // Webkit browsers on OS X abort momentum scrolls when the target
+    // of the scroll event is removed from the scrollable element.
+    // This hack (see related code in patchDisplay) makes sure the
+    // element is kept around.
+    if (dy && mac && webkit) {
+      outer: for (var cur = e.target, view = display.view; cur != scroll; cur = cur.parentNode) {
+        for (var i = 0; i < view.length; i++) {
+          if (view[i].node == cur) {
+            cm.display.currentWheelTarget = cur;
+            break outer;
+          }
+        }
+      }
+    }
+
+    // On some browsers, horizontal scrolling will cause redraws to
+    // happen before the gutter has been realigned, causing it to
+    // wriggle around in a most unseemly way. When we have an
+    // estimated pixels/delta value, we just handle horizontal
+    // scrolling entirely here. It'll be slightly off from native, but
+    // better than glitching out.
+    if (dx && !gecko && !presto && wheelPixelsPerUnit != null) {
+      if (dy)
+        setScrollTop(cm, Math.max(0, Math.min(scroll.scrollTop + dy * wheelPixelsPerUnit, scroll.scrollHeight - scroll.clientHeight)));
+      setScrollLeft(cm, Math.max(0, Math.min(scroll.scrollLeft + dx * wheelPixelsPerUnit, scroll.scrollWidth - scroll.clientWidth)));
+      e_preventDefault(e);
+      display.wheelStartX = null; // Abort measurement, if in progress
+      return;
+    }
+
+    // 'Project' the visible viewport to cover the area that is being
+    // scrolled into view (if we know enough to estimate it).
+    if (dy && wheelPixelsPerUnit != null) {
+      var pixels = dy * wheelPixelsPerUnit;
+      var top = cm.doc.scrollTop, bot = top + display.wrapper.clientHeight;
+      if (pixels < 0) top = Math.max(0, top + pixels - 50);
+      else bot = Math.min(cm.doc.height, bot + pixels + 50);
+      updateDisplaySimple(cm, {top: top, bottom: bot});
+    }
+
+    if (wheelSamples < 20) {
+      if (display.wheelStartX == null) {
+        display.wheelStartX = scroll.scrollLeft; display.wheelStartY = scroll.scrollTop;
+        display.wheelDX = dx; display.wheelDY = dy;
+        setTimeout(function() {
+          if (display.wheelStartX == null) return;
+          var movedX = scroll.scrollLeft - display.wheelStartX;
+          var movedY = scroll.scrollTop - display.wheelStartY;
+          var sample = (movedY && display.wheelDY && movedY / display.wheelDY) ||
+            (movedX && display.wheelDX && movedX / display.wheelDX);
+          display.wheelStartX = display.wheelStartY = null;
+          if (!sample) return;
+          wheelPixelsPerUnit = (wheelPixelsPerUnit * wheelSamples + sample) / (wheelSamples + 1);
+          ++wheelSamples;
+        }, 200);
+      } else {
+        display.wheelDX += dx; display.wheelDY += dy;
+      }
+    }
+  }
+
+  // KEY EVENTS
+
+  // Run a handler that was bound to a key.
+  function doHandleBinding(cm, bound, dropShift) {
+    if (typeof bound == "string") {
+      bound = commands[bound];
+      if (!bound) return false;
+    }
+    // Ensure previous input has been read, so that the handler sees a
+    // consistent view of the document
+    cm.display.input.ensurePolled();
+    var prevShift = cm.display.shift, done = false;
+    try {
+      if (isReadOnly(cm)) cm.state.suppressEdits = true;
+      if (dropShift) cm.display.shift = false;
+      done = bound(cm) != Pass;
+    } finally {
+      cm.display.shift = prevShift;
+      cm.state.suppressEdits = false;
+    }
+    return done;
+  }
+
+  function lookupKeyForEditor(cm, name, handle) {
+    for (var i = 0; i < cm.state.keyMaps.length; i++) {
+      var result = lookupKey(name, cm.state.keyMaps[i], handle, cm);
+      if (result) return result;
+    }
+    return (cm.options.extraKeys && lookupKey(name, cm.options.extraKeys, handle, cm))
+      || lookupKey(name, cm.options.keyMap, handle, cm);
+  }
+
+  var stopSeq = new Delayed;
+  function dispatchKey(cm, name, e, handle) {
+    var seq = cm.state.keySeq;
+    if (seq) {
+      if (isModifierKey(name)) return "handled";
+      stopSeq.set(50, function() {
+        if (cm.state.keySeq == seq) {
+          cm.state.keySeq = null;
+          cm.display.input.reset();
+        }
+      });
+      name = seq + " " + name;
+    }
+    var result = lookupKeyForEditor(cm, name, handle);
+
+    if (result == "multi")
+      cm.state.keySeq = name;
+    if (result == "handled")
+      signalLater(cm, "keyHandled", cm, name, e);
+
+    if (result == "handled" || result == "multi") {
+      e_preventDefault(e);
+      restartBlink(cm);
+    }
+
+    if (seq && !result && /\'$/.test(name)) {
+      e_preventDefault(e);
+      return true;
+    }
+    return !!result;
+  }
+
+  // Handle a key from the keydown event.
+  function handleKeyBinding(cm, e) {
+    var name = keyName(e, true);
+    if (!name) return false;
+
+    if (e.shiftKey && !cm.state.keySeq) {
+      // First try to resolve full name (including 'Shift-'). Failing
+      // that, see if there is a cursor-motion command (starting with
+      // 'go') bound to the keyname without 'Shift-'.
+      return dispatchKey(cm, "Shift-" + name, e, function(b) {return doHandleBinding(cm, b, true);})
+          || dispatchKey(cm, name, e, function(b) {
+               if (typeof b == "string" ? /^go[A-Z]/.test(b) : b.motion)
+                 return doHandleBinding(cm, b);
+             });
+    } else {
+      return dispatchKey(cm, name, e, function(b) { return doHandleBinding(cm, b); });
+    }
+  }
+
+  // Handle a key from the keypress event
+  function handleCharBinding(cm, e, ch) {
+    return dispatchKey(cm, "'" + ch + "'", e,
+                       function(b) { return doHandleBinding(cm, b, true); });
+  }
+
+  var lastStoppedKey = null;
+  function onKeyDown(e) {
+    var cm = this;
+    cm.curOp.focus = activeElt();
+    if (signalDOMEvent(cm, e)) return;
+    // IE does strange things with escape.
+    if (ie && ie_version < 11 && e.keyCode == 27) e.returnValue = false;
+    var code = e.keyCode;
+    cm.display.shift = code == 16 || e.shiftKey;
+    var handled = handleKeyBinding(cm, e);
+    if (presto) {
+      lastStoppedKey = handled ? code : null;
+      // Opera has no cut event... we try to at least catch the key combo
+      if (!handled && code == 88 && !hasCopyEvent && (mac ? e.metaKey : e.ctrlKey))
+        cm.replaceSelection("", null, "cut");
+    }
+
+    // Turn mouse into crosshair when Alt is held on Mac.
+    if (code == 18 && !/\bCodeMirror-crosshair\b/.test(cm.display.lineDiv.className))
+      showCrossHair(cm);
+  }
+
+  function showCrossHair(cm) {
+    var lineDiv = cm.display.lineDiv;
+    addClass(lineDiv, "CodeMirror-crosshair");
+
+    function up(e) {
+      if (e.keyCode == 18 || !e.altKey) {
+        rmClass(lineDiv, "CodeMirror-crosshair");
+        off(document, "keyup", up);
+        off(document, "mouseover", up);
+      }
+    }
+    on(document, "keyup", up);
+    on(document, "mouseover", up);
+  }
+
+  function onKeyUp(e) {
+    if (e.keyCode == 16) this.doc.sel.shift = false;
+    signalDOMEvent(this, e);
+  }
+
+  function onKeyPress(e) {
+    var cm = this;
+    if (eventInWidget(cm.display, e) || signalDOMEvent(cm, e) || e.ctrlKey && !e.altKey || mac && e.metaKey) return;
+    var keyCode = e.keyCode, charCode = e.charCode;
+    if (presto && keyCode == lastStoppedKey) {lastStoppedKey = null; e_preventDefault(e); return;}
+    if ((presto && (!e.which || e.which < 10)) && handleKeyBinding(cm, e)) return;
+    var ch = String.fromCharCode(charCode == null ? keyCode : charCode);
+    if (handleCharBinding(cm, e, ch)) return;
+    cm.display.input.onKeyPress(e);
+  }
+
+  // FOCUS/BLUR EVENTS
+
+  function delayBlurEvent(cm) {
+    cm.state.delayingBlurEvent = true;
+    setTimeout(function() {
+      if (cm.state.delayingBlurEvent) {
+        cm.state.delayingBlurEvent = false;
+        onBlur(cm);
+      }
+    }, 100);
+  }
+
+  function onFocus(cm) {
+    if (cm.state.delayingBlurEvent) cm.state.delayingBlurEvent = false;
+
+    if (cm.options.readOnly == "nocursor") return;
+    if (!cm.state.focused) {
+      signal(cm, "focus", cm);
+      cm.state.focused = true;
+      addClass(cm.display.wrapper, "CodeMirror-focused");
+      // This test prevents this from firing when a context
+      // menu is closed (since the input reset would kill the
+      // select-all detection hack)
+      if (!cm.curOp && cm.display.selForContextMenu != cm.doc.sel) {
+        cm.display.input.reset();
+        if (webkit) setTimeout(function() { cm.display.input.reset(true); }, 20); // Issue #1730
+      }
+      cm.display.input.receivedFocus();
+    }
+    restartBlink(cm);
+  }
+  function onBlur(cm) {
+    if (cm.state.delayingBlurEvent) return;
+
+    if (cm.state.focused) {
+      signal(cm, "blur", cm);
+      cm.state.focused = false;
+      rmClass(cm.display.wrapper, "CodeMirror-focused");
+    }
+    clearInterval(cm.display.blinker);
+    setTimeout(function() {if (!cm.state.focused) cm.display.shift = false;}, 150);
+  }
+
+  // CONTEXT MENU HANDLING
+
+  // To make the context menu work, we need to briefly unhide the
+  // textarea (making it as unobtrusive as possible) to let the
+  // right-click take effect on it.
+  function onContextMenu(cm, e) {
+    if (eventInWidget(cm.display, e) || contextMenuInGutter(cm, e)) return;
+    cm.display.input.onContextMenu(e);
+  }
+
+  function contextMenuInGutter(cm, e) {
+    if (!hasHandler(cm, "gutterContextMenu")) return false;
+    return gutterEvent(cm, e, "gutterContextMenu", false, signal);
+  }
+
+  // UPDATING
+
+  // Compute the position of the end of a change (its 'to' property
+  // refers to the pre-change end).
+  var changeEnd = CodeMirror.changeEnd = function(change) {
+    if (!change.text) return change.to;
+    return Pos(change.from.line + change.text.length - 1,
+               lst(change.text).length + (change.text.length == 1 ? change.from.ch : 0));
+  };
+
+  // Adjust a position to refer to the post-change position of the
+  // same text, or the end of the change if the change covers it.
+  function adjustForChange(pos, change) {
+    if (cmp(pos, change.from) < 0) return pos;
+    if (cmp(pos, change.to) <= 0) return changeEnd(change);
+
+    var line = pos.line + change.text.length - (change.to.line - change.from.line) - 1, ch = pos.ch;
+    if (pos.line == change.to.line) ch += changeEnd(change).ch - change.to.ch;
+    return Pos(line, ch);
+  }
+
+  function computeSelAfterChange(doc, change) {
+    var out = [];
+    for (var i = 0; i < doc.sel.ranges.length; i++) {
+      var range = doc.sel.ranges[i];
+      out.push(new Range(adjustForChange(range.anchor, change),
+                         adjustForChange(range.head, change)));
+    }
+    return normalizeSelection(out, doc.sel.primIndex);
+  }
+
+  function offsetPos(pos, old, nw) {
+    if (pos.line == old.line)
+      return Pos(nw.line, pos.ch - old.ch + nw.ch);
+    else
+      return Pos(nw.line + (pos.line - old.line), pos.ch);
+  }
+
+  // Used by replaceSelections to allow moving the selection to the
+  // start or around the replaced test. Hint may be "start" or "around".
+  function computeReplacedSel(doc, changes, hint) {
+    var out = [];
+    var oldPrev = Pos(doc.first, 0), newPrev = oldPrev;
+    for (var i = 0; i < changes.length; i++) {
+      var change = changes[i];
+      var from = offsetPos(change.from, oldPrev, newPrev);
+      var to = offsetPos(changeEnd(change), oldPrev, newPrev);
+      oldPrev = change.to;
+      newPrev = to;
+      if (hint == "around") {
+        var range = doc.sel.ranges[i], inv = cmp(range.head, range.anchor) < 0;
+        out[i] = new Range(inv ? to : from, inv ? from : to);
+      } else {
+        out[i] = new Range(from, from);
+      }
+    }
+    return new Selection(out, doc.sel.primIndex);
+  }
+
+  // Allow "beforeChange" event handlers to influence a change
+  function filterChange(doc, change, update) {
+    var obj = {
+      canceled: false,
+      from: change.from,
+      to: change.to,
+      text: change.text,
+      origin: change.origin,
+      cancel: function() { this.canceled = true; }
+    };
+    if (update) obj.update = function(from, to, text, origin) {
+      if (from) this.from = clipPos(doc, from);
+      if (to) this.to = clipPos(doc, to);
+      if (text) this.text = text;
+      if (origin !== undefined) this.origin = origin;
+    };
+    signal(doc, "beforeChange", doc, obj);
+    if (doc.cm) signal(doc.cm, "beforeChange", doc.cm, obj);
+
+    if (obj.canceled) return null;
+    return {from: obj.from, to: obj.to, text: obj.text, origin: obj.origin};
+  }
+
+  // Apply a change to a document, and add it to the document's
+  // history, and propagating it to all linked documents.
+  function makeChange(doc, change, ignoreReadOnly) {
+    if (doc.cm) {
+      if (!doc.cm.curOp) return operation(doc.cm, makeChange)(doc, change, ignoreReadOnly);
+      if (doc.cm.state.suppressEdits) return;
+    }
+
+    if (hasHandler(doc, "beforeChange") || doc.cm && hasHandler(doc.cm, "beforeChange")) {
+      change = filterChange(doc, change, true);
+      if (!change) return;
+    }
+
+    // Possibly split or suppress the update based on the presence
+    // of read-only spans in its range.
+    var split = sawReadOnlySpans && !ignoreReadOnly && removeReadOnlyRanges(doc, change.from, change.to);
+    if (split) {
+      for (var i = split.length - 1; i >= 0; --i)
+        makeChangeInner(doc, {from: split[i].from, to: split[i].to, text: i ? [""] : change.text});
+    } else {
+      makeChangeInner(doc, change);
+    }
+  }
+
+  function makeChangeInner(doc, change) {
+    if (change.text.length == 1 && change.text[0] == "" && cmp(change.from, change.to) == 0) return;
+    var selAfter = computeSelAfterChange(doc, change);
+    addChangeToHistory(doc, change, selAfter, doc.cm ? doc.cm.curOp.id : NaN);
+
+    makeChangeSingleDoc(doc, change, selAfter, stretchSpansOverChange(doc, change));
+    var rebased = [];
+
+    linkedDocs(doc, function(doc, sharedHist) {
+      if (!sharedHist && indexOf(rebased, doc.history) == -1) {
+        rebaseHist(doc.history, change);
+        rebased.push(doc.history);
+      }
+      makeChangeSingleDoc(doc, change, null, stretchSpansOverChange(doc, change));
+    });
+  }
+
+  // Revert a change stored in a document's history.
+  function makeChangeFromHistory(doc, type, allowSelectionOnly) {
+    if (doc.cm && doc.cm.state.suppressEdits) return;
+
+    var hist = doc.history, event, selAfter = doc.sel;
+    var source = type == "undo" ? hist.done : hist.undone, dest = type == "undo" ? hist.undone : hist.done;
+
+    // Verify that there is a useable event (so that ctrl-z won't
+    // needlessly clear selection events)
+    for (var i = 0; i < source.length; i++) {
+      event = source[i];
+      if (allowSelectionOnly ? event.ranges && !event.equals(doc.sel) : !event.ranges)
+        break;
+    }
+    if (i == source.length) return;
+    hist.lastOrigin = hist.lastSelOrigin = null;
+
+    for (;;) {
+      event = source.pop();
+      if (event.ranges) {
+        pushSelectionToHistory(event, dest);
+        if (allowSelectionOnly && !event.equals(doc.sel)) {
+          setSelection(doc, event, {clearRedo: false});
+          return;
+        }
+        selAfter = event;
+      }
+      else break;
+    }
+
+    // Build up a reverse change object to add to the opposite history
+    // stack (redo when undoing, and vice versa).
+    var antiChanges = [];
+    pushSelectionToHistory(selAfter, dest);
+    dest.push({changes: antiChanges, generation: hist.generation});
+    hist.generation = event.generation || ++hist.maxGeneration;
+
+    var filter = hasHandler(doc, "beforeChange") || doc.cm && hasHandler(doc.cm, "beforeChange");
+
+    for (var i = event.changes.length - 1; i >= 0; --i) {
+      var change = event.changes[i];
+      change.origin = type;
+      if (filter && !filterChange(doc, change, false)) {
+        source.length = 0;
+        return;
+      }
+
+      antiChanges.push(historyChangeFromChange(doc, change));
+
+      var after = i ? computeSelAfterChange(doc, change) : lst(source);
+      makeChangeSingleDoc(doc, change, after, mergeOldSpans(doc, change));
+      if (!i && doc.cm) doc.cm.scrollIntoView({from: change.from, to: changeEnd(change)});
+      var rebased = [];
+
+      // Propagate to the linked documents
+      linkedDocs(doc, function(doc, sharedHist) {
+        if (!sharedHist && indexOf(rebased, doc.history) == -1) {
+          rebaseHist(doc.history, change);
+          rebased.push(doc.history);
+        }
+        makeChangeSingleDoc(doc, change, null, mergeOldSpans(doc, change));
+      });
+    }
+  }
+
+  // Sub-views need their line numbers shifted when text is added
+  // above or below them in the parent document.
+  function shiftDoc(doc, distance) {
+    if (distance == 0) return;
+    doc.first += distance;
+    doc.sel = new Selection(map(doc.sel.ranges, function(range) {
+      return new Range(Pos(range.anchor.line + distance, range.anchor.ch),
+                       Pos(range.head.line + distance, range.head.ch));
+    }), doc.sel.primIndex);
+    if (doc.cm) {
+      regChange(doc.cm, doc.first, doc.first - distance, distance);
+      for (var d = doc.cm.display, l = d.viewFrom; l < d.viewTo; l++)
+        regLineChange(doc.cm, l, "gutter");
+    }
+  }
+
+  // More lower-level change function, handling only a single document
+  // (not linked ones).
+  function makeChangeSingleDoc(doc, change, selAfter, spans) {
+    if (doc.cm && !doc.cm.curOp)
+      return operation(doc.cm, makeChangeSingleDoc)(doc, change, selAfter, spans);
+
+    if (change.to.line < doc.first) {
+      shiftDoc(doc, change.text.length - 1 - (change.to.line - change.from.line));
+      return;
+    }
+    if (change.from.line > doc.lastLine()) return;
+
+    // Clip the change to the size of this doc
+    if (change.from.line < doc.first) {
+      var shift = change.text.length - 1 - (doc.first - change.from.line);
+      shiftDoc(doc, shift);
+      change = {from: Pos(doc.first, 0), to: Pos(change.to.line + shift, change.to.ch),
+                text: [lst(change.text)], origin: change.origin};
+    }
+    var last = doc.lastLine();
+    if (change.to.line > last) {
+      change = {from: change.from, to: Pos(last, getLine(doc, last).text.length),
+                text: [change.text[0]], origin: change.origin};
+    }
+
+    change.removed = getBetween(doc, change.from, change.to);
+
+    if (!selAfter) selAfter = computeSelAfterChange(doc, change);
+    if (doc.cm) makeChangeSingleDocInEditor(doc.cm, change, spans);
+    else updateDoc(doc, change, spans);
+    setSelectionNoUndo(doc, selAfter, sel_dontScroll);
+  }
+
+  // Handle the interaction of a change to a document with the editor
+  // that this document is part of.
+  function makeChangeSingleDocInEditor(cm, change, spans) {
+    var doc = cm.doc, display = cm.display, from = change.from, to = change.to;
+
+    var recomputeMaxLength = false, checkWidthStart = from.line;
+    if (!cm.options.lineWrapping) {
+      checkWidthStart = lineNo(visualLine(getLine(doc, from.line)));
+      doc.iter(checkWidthStart, to.line + 1, function(line) {
+        if (line == display.maxLine) {
+          recomputeMaxLength = true;
+          return true;
+        }
+      });
+    }
+
+    if (doc.sel.contains(change.from, change.to) > -1)
+      signalCursorActivity(cm);
+
+    updateDoc(doc, change, spans, estimateHeight(cm));
+
+    if (!cm.options.lineWrapping) {
+      doc.iter(checkWidthStart, from.line + change.text.length, function(line) {
+        var len = lineLength(line);
+        if (len > display.maxLineLength) {
+          display.maxLine = line;
+          display.maxLineLength = len;
+          display.maxLineChanged = true;
+          recomputeMaxLength = false;
+        }
+      });
+      if (recomputeMaxLength) cm.curOp.updateMaxLine = true;
+    }
+
+    // Adjust frontier, schedule worker
+    doc.frontier = Math.min(doc.frontier, from.line);
+    startWorker(cm, 400);
+
+    var lendiff = change.text.length - (to.line - from.line) - 1;
+    // Remember that these lines changed, for updating the display
+    if (change.full)
+      regChange(cm);
+    else if (from.line == to.line && change.text.length == 1 && !isWholeLineUpdate(cm.doc, change))
+      regLineChange(cm, from.line, "text");
+    else
+      regChange(cm, from.line, to.line + 1, lendiff);
+
+    var changesHandler = hasHandler(cm, "changes"), changeHandler = hasHandler(cm, "change");
+    if (changeHandler || changesHandler) {
+      var obj = {
+        from: from, to: to,
+        text: change.text,
+        removed: change.removed,
+        origin: change.origin
+      };
+      if (changeHandler) signalLater(cm, "change", cm, obj);
+      if (changesHandler) (cm.curOp.changeObjs || (cm.curOp.changeObjs = [])).push(obj);
+    }
+    cm.display.selForContextMenu = null;
+  }
+
+  function replaceRange(doc, code, from, to, origin) {
+    if (!to) to = from;
+    if (cmp(to, from) < 0) { var tmp = to; to = from; from = tmp; }
+    if (typeof code == "string") code = doc.splitLines(code);
+    makeChange(doc, {from: from, to: to, text: code, origin: origin});
+  }
+
+  // SCROLLING THINGS INTO VIEW
+
+  // If an editor sits on the top or bottom of the window, partially
+  // scrolled out of view, this ensures that the cursor is visible.
+  function maybeScrollWindow(cm, coords) {
+    if (signalDOMEvent(cm, "scrollCursorIntoView")) return;
+
+    var display = cm.display, box = display.sizer.getBoundingClientRect(), doScroll = null;
+    if (coords.top + box.top < 0) doScroll = true;
+    else if (coords.bottom + box.top > (window.innerHeight || document.documentElement.clientHeight)) doScroll = false;
+    if (doScroll != null && !phantom) {
+      var scrollNode = elt("div", "\u200b", null, "position: absolute; top: " +
+                           (coords.top - display.viewOffset - paddingTop(cm.display)) + "px; height: " +
+                           (coords.bottom - coords.top + scrollGap(cm) + display.barHeight) + "px; left: " +
+                           coords.left + "px; width: 2px;");
+      cm.display.lineSpace.appendChild(scrollNode);
+      scrollNode.scrollIntoView(doScroll);
+      cm.display.lineSpace.removeChild(scrollNode);
+    }
+  }
+
+  // Scroll a given position into view (immediately), verifying that
+  // it actually became visible (as line heights are accurately
+  // measured, the position of something may 'drift' during drawing).
+  function scrollPosIntoView(cm, pos, end, margin) {
+    if (margin == null) margin = 0;
+    for (var limit = 0; limit < 5; limit++) {
+      var changed = false, coords = cursorCoords(cm, pos);
+      var endCoords = !end || end == pos ? coords : cursorCoords(cm, end);
+      var scrollPos = calculateScrollPos(cm, Math.min(coords.left, endCoords.left),
+                                         Math.min(coords.top, endCoords.top) - margin,
+                                         Math.max(coords.left, endCoords.left),
+                                         Math.max(coords.bottom, endCoords.bottom) + margin);
+      var startTop = cm.doc.scrollTop, startLeft = cm.doc.scrollLeft;
+      if (scrollPos.scrollTop != null) {
+        setScrollTop(cm, scrollPos.scrollTop);
+        if (Math.abs(cm.doc.scrollTop - startTop) > 1) changed = true;
+      }
+      if (scrollPos.scrollLeft != null) {
+        setScrollLeft(cm, scrollPos.scrollLeft);
+        if (Math.abs(cm.doc.scrollLeft - startLeft) > 1) changed = true;
+      }
+      if (!changed) break;
+    }
+    return coords;
+  }
+
+  // Scroll a given set of coordinates into view (immediately).
+  function scrollIntoView(cm, x1, y1, x2, y2) {
+    var scrollPos = calculateScrollPos(cm, x1, y1, x2, y2);
+    if (scrollPos.scrollTop != null) setScrollTop(cm, scrollPos.scrollTop);
+    if (scrollPos.scrollLeft != null) setScrollLeft(cm, scrollPos.scrollLeft);
+  }
+
+  // Calculate a new scroll position needed to scroll the given
+  // rectangle into view. Returns an object with scrollTop and
+  // scrollLeft properties. When these are undefined, the
+  // vertical/horizontal position does not need to be adjusted.
+  function calculateScrollPos(cm, x1, y1, x2, y2) {
+    var display = cm.display, snapMargin = textHeight(cm.display);
+    if (y1 < 0) y1 = 0;
+    var screentop = cm.curOp && cm.curOp.scrollTop != null ? cm.curOp.scrollTop : display.scroller.scrollTop;
+    var screen = displayHeight(cm), result = {};
+    if (y2 - y1 > screen) y2 = y1 + screen;
+    var docBottom = cm.doc.height + paddingVert(display);
+    var atTop = y1 < snapMargin, atBottom = y2 > docBottom - snapMargin;
+    if (y1 < screentop) {
+      result.scrollTop = atTop ? 0 : y1;
+    } else if (y2 > screentop + screen) {
+      var newTop = Math.min(y1, (atBottom ? docBottom : y2) - screen);
+      if (newTop != screentop) result.scrollTop = newTop;
+    }
+
+    var screenleft = cm.curOp && cm.curOp.scrollLeft != null ? cm.curOp.scrollLeft : display.scroller.scrollLeft;
+    var screenw = displayWidth(cm) - (cm.options.fixedGutter ? display.gutters.offsetWidth : 0);
+    var tooWide = x2 - x1 > screenw;
+    if (tooWide) x2 = x1 + screenw;
+    if (x1 < 10)
+      result.scrollLeft = 0;
+    else if (x1 < screenleft)
+      result.scrollLeft = Math.max(0, x1 - (tooWide ? 0 : 10));
+    else if (x2 > screenw + screenleft - 3)
+      result.scrollLeft = x2 + (tooWide ? 0 : 10) - screenw;
+    return result;
+  }
+
+  // Store a relative adjustment to the scroll position in the current
+  // operation (to be applied when the operation finishes).
+  function addToScrollPos(cm, left, top) {
+    if (left != null || top != null) resolveScrollToPos(cm);
+    if (left != null)
+      cm.curOp.scrollLeft = (cm.curOp.scrollLeft == null ? cm.doc.scrollLeft : cm.curOp.scrollLeft) + left;
+    if (top != null)
+      cm.curOp.scrollTop = (cm.curOp.scrollTop == null ? cm.doc.scrollTop : cm.curOp.scrollTop) + top;
+  }
+
+  // Make sure that at the end of the operation the current cursor is
+  // shown.
+  function ensureCursorVisible(cm) {
+    resolveScrollToPos(cm);
+    var cur = cm.getCursor(), from = cur, to = cur;
+    if (!cm.options.lineWrapping) {
+      from = cur.ch ? Pos(cur.line, cur.ch - 1) : cur;
+      to = Pos(cur.line, cur.ch + 1);
+    }
+    cm.curOp.scrollToPos = {from: from, to: to, margin: cm.options.cursorScrollMargin, isCursor: true};
+  }
+
+  // When an operation has its scrollToPos property set, and another
+  // scroll action is applied before the end of the operation, this
+  // 'simulates' scrolling that position into view in a cheap way, so
+  // that the effect of intermediate scroll commands is not ignored.
+  function resolveScrollToPos(cm) {
+    var range = cm.curOp.scrollToPos;
+    if (range) {
+      cm.curOp.scrollToPos = null;
+      var from = estimateCoords(cm, range.from), to = estimateCoords(cm, range.to);
+      var sPos = calculateScrollPos(cm, Math.min(from.left, to.left),
+                                    Math.min(from.top, to.top) - range.margin,
+                                    Math.max(from.right, to.right),
+                                    Math.max(from.bottom, to.bottom) + range.margin);
+      cm.scrollTo(sPos.scrollLeft, sPos.scrollTop);
+    }
+  }
+
+  // API UTILITIES
+
+  // Indent the given line. The how parameter can be "smart",
+  // "add"/null, "subtract", or "prev". When aggressive is false
+  // (typically set to true for forced single-line indents), empty
+  // lines are not indented, and places where the mode returns Pass
+  // are left alone.
+  function indentLine(cm, n, how, aggressive) {
+    var doc = cm.doc, state;
+    if (how == null) how = "add";
+    if (how == "smart") {
+      // Fall back to "prev" when the mode doesn't have an indentation
+      // method.
+      if (!doc.mode.indent) how = "prev";
+      else state = getStateBefore(cm, n);
+    }
+
+    var tabSize = cm.options.tabSize;
+    var line = getLine(doc, n), curSpace = countColumn(line.text, null, tabSize);
+    if (line.stateAfter) line.stateAfter = null;
+    var curSpaceString = line.text.match(/^\s*/)[0], indentation;
+    if (!aggressive && !/\S/.test(line.text)) {
+      indentation = 0;
+      how = "not";
+    } else if (how == "smart") {
+      indentation = doc.mode.indent(state, line.text.slice(curSpaceString.length), line.text);
+      if (indentation == Pass || indentation > 150) {
+        if (!aggressive) return;
+        how = "prev";
+      }
+    }
+    if (how == "prev") {
+      if (n > doc.first) indentation = countColumn(getLine(doc, n-1).text, null, tabSize);
+      else indentation = 0;
+    } else if (how == "add") {
+      indentation = curSpace + cm.options.indentUnit;
+    } else if (how == "subtract") {
+      indentation = curSpace - cm.options.indentUnit;
+    } else if (typeof how == "number") {
+      indentation = curSpace + how;
+    }
+    indentation = Math.max(0, indentation);
+
+    var indentString = "", pos = 0;
+    if (cm.options.indentWithTabs)
+      for (var i = Math.floor(indentation / tabSize); i; --i) {pos += tabSize; indentString += "\t";}
+    if (pos < indentation) indentString += spaceStr(indentation - pos);
+
+    if (indentString != curSpaceString) {
+      replaceRange(doc, indentString, Pos(n, 0), Pos(n, curSpaceString.length), "+input");
+      line.stateAfter = null;
+      return true;
+    } else {
+      // Ensure that, if the cursor was in the whitespace at the start
+      // of the line, it is moved to the end of that space.
+      for (var i = 0; i < doc.sel.ranges.length; i++) {
+        var range = doc.sel.ranges[i];
+        if (range.head.line == n && range.head.ch < curSpaceString.length) {
+          var pos = Pos(n, curSpaceString.length);
+          replaceOneSelection(doc, i, new Range(pos, pos));
+          break;
+        }
+      }
+    }
+  }
+
+  // Utility for applying a change to a line by handle or number,
+  // returning the number and optionally registering the line as
+  // changed.
+  function changeLine(doc, handle, changeType, op) {
+    var no = handle, line = handle;
+    if (typeof handle == "number") line = getLine(doc, clipLine(doc, handle));
+    else no = lineNo(handle);
+    if (no == null) return null;
+    if (op(line, no) && doc.cm) regLineChange(doc.cm, no, changeType);
+    return line;
+  }
+
+  // Helper for deleting text near the selection(s), used to implement
+  // backspace, delete, and similar functionality.
+  function deleteNearSelection(cm, compute) {
+    var ranges = cm.doc.sel.ranges, kill = [];
+    // Build up a set of ranges to kill first, merging overlapping
+    // ranges.
+    for (var i = 0; i < ranges.length; i++) {
+      var toKill = compute(ranges[i]);
+      while (kill.length && cmp(toKill.from, lst(kill).to) <= 0) {
+        var replaced = kill.pop();
+        if (cmp(replaced.from, toKill.from) < 0) {
+          toKill.from = replaced.from;
+          break;
+        }
+      }
+      kill.push(toKill);
+    }
+    // Next, remove those actual ranges.
+    runInOp(cm, function() {
+      for (var i = kill.length - 1; i >= 0; i--)
+        replaceRange(cm.doc, "", kill[i].from, kill[i].to, "+delete");
+      ensureCursorVisible(cm);
+    });
+  }
+
+  // Used for horizontal relative motion. Dir is -1 or 1 (left or
+  // right), unit can be "char", "column" (like char, but doesn't
+  // cross line boundaries), "word" (across next word), or "group" (to
+  // the start of next group of word or non-word-non-whitespace
+  // chars). The visually param controls whether, in right-to-left
+  // text, direction 1 means to move towards the next index in the
+  // string, or towards the character to the right of the current
+  // position. The resulting position will have a hitSide=true
+  // property if it reached the end of the document.
+  function findPosH(doc, pos, dir, unit, visually) {
+    var line = pos.line, ch = pos.ch, origDir = dir;
+    var lineObj = getLine(doc, line);
+    var possible = true;
+    function findNextLine() {
+      var l = line + dir;
+      if (l < doc.first || l >= doc.first + doc.size) return (possible = false);
+      line = l;
+      return lineObj = getLine(doc, l);
+    }
+    function moveOnce(boundToLine) {
+      var next = (visually ? moveVisually : moveLogically)(lineObj, ch, dir, true);
+      if (next == null) {
+        if (!boundToLine && findNextLine()) {
+          if (visually) ch = (dir < 0 ? lineRight : lineLeft)(lineObj);
+          else ch = dir < 0 ? lineObj.text.length : 0;
+        } else return (possible = false);
+      } else ch = next;
+      return true;
+    }
+
+    if (unit == "char") moveOnce();
+    else if (unit == "column") moveOnce(true);
+    else if (unit == "word" || unit == "group") {
+      var sawType = null, group = unit == "group";
+      var helper = doc.cm && doc.cm.getHelper(pos, "wordChars");
+      for (var first = true;; first = false) {
+        if (dir < 0 && !moveOnce(!first)) break;
+        var cur = lineObj.text.charAt(ch) || "\n";
+        var type = isWordChar(cur, helper) ? "w"
+          : group && cur == "\n" ? "n"
+          : !group || /\s/.test(cur) ? null
+          : "p";
+        if (group && !first && !type) type = "s";
+        if (sawType && sawType != type) {
+          if (dir < 0) {dir = 1; moveOnce();}
+          break;
+        }
+
+        if (type) sawType = type;
+        if (dir > 0 && !moveOnce(!first)) break;
+      }
+    }
+    var result = skipAtomic(doc, Pos(line, ch), origDir, true);
+    if (!possible) result.hitSide = true;
+    return result;
+  }
+
+  // For relative vertical movement. Dir may be -1 or 1. Unit can be
+  // "page" or "line". The resulting position will have a hitSide=true
+  // property if it reached the end of the document.
+  function findPosV(cm, pos, dir, unit) {
+    var doc = cm.doc, x = pos.left, y;
+    if (unit == "page") {
+      var pageSize = Math.min(cm.display.wrapper.clientHeight, window.innerHeight || document.documentElement.clientHeight);
+      y = pos.top + dir * (pageSize - (dir < 0 ? 1.5 : .5) * textHeight(cm.display));
+    } else if (unit == "line") {
+      y = dir > 0 ? pos.bottom + 3 : pos.top - 3;
+    }
+    for (;;) {
+      var target = coordsChar(cm, x, y);
+      if (!target.outside) break;
+      if (dir < 0 ? y <= 0 : y >= doc.height) { target.hitSide = true; break; }
+      y += dir * 5;
+    }
+    return target;
+  }
+
+  // EDITOR METHODS
+
+  // The publicly visible API. Note that methodOp(f) means
+  // 'wrap f in an operation, performed on its `this` parameter'.
+
+  // This is not the complete set of editor methods. Most of the
+  // methods defined on the Doc type are also injected into
+  // CodeMirror.prototype, for backwards compatibility and
+  // convenience.
+
+  CodeMirror.prototype = {
+    constructor: CodeMirror,
+    focus: function(){window.focus(); this.display.input.focus();},
+
+    setOption: function(option, value) {
+      var options = this.options, old = options[option];
+      if (options[option] == value && option != "mode") return;
+      options[option] = value;
+      if (optionHandlers.hasOwnProperty(option))
+        operation(this, optionHandlers[option])(this, value, old);
+    },
+
+    getOption: function(option) {return this.options[option];},
+    getDoc: function() {return this.doc;},
+
+    addKeyMap: function(map, bottom) {
+      this.state.keyMaps[bottom ? "push" : "unshift"](getKeyMap(map));
+    },
+    removeKeyMap: function(map) {
+      var maps = this.state.keyMaps;
+      for (var i = 0; i < maps.length; ++i)
+        if (maps[i] == map || maps[i].name == map) {
+          maps.splice(i, 1);
+          return true;
+        }
+    },
+
+    addOverlay: methodOp(function(spec, options) {
+      var mode = spec.token ? spec : CodeMirror.getMode(this.options, spec);
+      if (mode.startState) throw new Error("Overlays may not be stateful.");
+      this.state.overlays.push({mode: mode, modeSpec: spec, opaque: options && options.opaque});
+      this.state.modeGen++;
+      regChange(this);
+    }),
+    removeOverlay: methodOp(function(spec) {
+      var overlays = this.state.overlays;
+      for (var i = 0; i < overlays.length; ++i) {
+        var cur = overlays[i].modeSpec;
+        if (cur == spec || typeof spec == "string" && cur.name == spec) {
+          overlays.splice(i, 1);
+          this.state.modeGen++;
+          regChange(this);
+          return;
+        }
+      }
+    }),
+
+    indentLine: methodOp(function(n, dir, aggressive) {
+      if (typeof dir != "string" && typeof dir != "number") {
+        if (dir == null) dir = this.options.smartIndent ? "smart" : "prev";
+        else dir = dir ? "add" : "subtract";
+      }
+      if (isLine(this.doc, n)) indentLine(this, n, dir, aggressive);
+    }),
+    indentSelection: methodOp(function(how) {
+      var ranges = this.doc.sel.ranges, end = -1;
+      for (var i = 0; i < ranges.length; i++) {
+        var range = ranges[i];
+        if (!range.empty()) {
+          var from = range.from(), to = range.to();
+          var start = Math.max(end, from.line);
+          end = Math.min(this.lastLine(), to.line - (to.ch ? 0 : 1)) + 1;
+          for (var j = start; j < end; ++j)
+            indentLine(this, j, how);
+          var newRanges = this.doc.sel.ranges;
+          if (from.ch == 0 && ranges.length == newRanges.length && newRanges[i].from().ch > 0)
+            replaceOneSelection(this.doc, i, new Range(from, newRanges[i].to()), sel_dontScroll);
+        } else if (range.head.line > end) {
+          indentLine(this, range.head.line, how, true);
+          end = range.head.line;
+          if (i == this.doc.sel.primIndex) ensureCursorVisible(this);
+        }
+      }
+    }),
+
+    // Fetch the parser token for a given character. Useful for hacks
+    // that want to inspect the mode state (say, for completion).
+    getTokenAt: function(pos, precise) {
+      return takeToken(this, pos, precise);
+    },
+
+    getLineTokens: function(line, precise) {
+      return takeToken(this, Pos(line), precise, true);
+    },
+
+    getTokenTypeAt: function(pos) {
+      pos = clipPos(this.doc, pos);
+      var styles = getLineStyles(this, getLine(this.doc, pos.line));
+      var before = 0, after = (styles.length - 1) / 2, ch = pos.ch;
+      var type;
+      if (ch == 0) type = styles[2];
+      else for (;;) {
+        var mid = (before + after) >> 1;
+        if ((mid ? styles[mid * 2 - 1] : 0) >= ch) after = mid;
+        else if (styles[mid * 2 + 1] < ch) before = mid + 1;
+        else { type = styles[mid * 2 + 2]; break; }
+      }
+      var cut = type ? type.indexOf("cm-overlay ") : -1;
+      return cut < 0 ? type : cut == 0 ? null : type.slice(0, cut - 1);
+    },
+
+    getModeAt: function(pos) {
+      var mode = this.doc.mode;
+      if (!mode.innerMode) return mode;
+      return CodeMirror.innerMode(mode, this.getTokenAt(pos).state).mode;
+    },
+
+    getHelper: function(pos, type) {
+      return this.getHelpers(pos, type)[0];
+    },
+
+    getHelpers: function(pos, type) {
+      var found = [];
+      if (!helpers.hasOwnProperty(type)) return found;
+      var help = helpers[type], mode = this.getModeAt(pos);
+      if (typeof mode[type] == "string") {
+        if (help[mode[type]]) found.push(help[mode[type]]);
+      } else if (mode[type]) {
+        for (var i = 0; i < mode[type].length; i++) {
+          var val = help[mode[type][i]];
+          if (val) found.push(val);
+        }
+      } else if (mode.helperType && help[mode.helperType]) {
+        found.push(help[mode.helperType]);
+      } else if (help[mode.name]) {
+        found.push(help[mode.name]);
+      }
+      for (var i = 0; i < help._global.length; i++) {
+        var cur = help._global[i];
+        if (cur.pred(mode, this) && indexOf(found, cur.val) == -1)
+          found.push(cur.val);
+      }
+      return found;
+    },
+
+    getStateAfter: function(line, precise) {
+      var doc = this.doc;
+      line = clipLine(doc, line == null ? doc.first + doc.size - 1: line);
+      return getStateBefore(this, line + 1, precise);
+    },
+
+    cursorCoords: function(start, mode) {
+      var pos, range = this.doc.sel.primary();
+      if (start == null) pos = range.head;
+      else if (typeof start == "object") pos = clipPos(this.doc, start);
+      else pos = start ? range.from() : range.to();
+      return cursorCoords(this, pos, mode || "page");
+    },
+
+    charCoords: function(pos, mode) {
+      return charCoords(this, clipPos(this.doc, pos), mode || "page");
+    },
+
+    coordsChar: function(coords, mode) {
+      coords = fromCoordSystem(this, coords, mode || "page");
+      return coordsChar(this, coords.left, coords.top);
+    },
+
+    lineAtHeight: function(height, mode) {
+      height = fromCoordSystem(this, {top: height, left: 0}, mode || "page").top;
+      return lineAtHeight(this.doc, height + this.display.viewOffset);
+    },
+    heightAtLine: function(line, mode) {
+      var end = false, lineObj;
+      if (typeof line == "number") {
+        var last = this.doc.first + this.doc.size - 1;
+        if (line < this.doc.first) line = this.doc.first;
+        else if (line > last) { line = last; end = true; }
+        lineObj = getLine(this.doc, line);
+      } else {
+        lineObj = line;
+      }
+      return intoCoordSystem(this, lineObj, {top: 0, left: 0}, mode || "page").top +
+        (end ? this.doc.height - heightAtLine(lineObj) : 0);
+    },
+
+    defaultTextHeight: function() { return textHeight(this.display); },
+    defaultCharWidth: function() { return charWidth(this.display); },
+
+    setGutterMarker: methodOp(function(line, gutterID, value) {
+      return changeLine(this.doc, line, "gutter", function(line) {
+        var markers = line.gutterMarkers || (line.gutterMarkers = {});
+        markers[gutterID] = value;
+        if (!value && isEmpty(markers)) line.gutterMarkers = null;
+        return true;
+      });
+    }),
+
+    clearGutter: methodOp(function(gutterID) {
+      var cm = this, doc = cm.doc, i = doc.first;
+      doc.iter(function(line) {
+        if (line.gutterMarkers && line.gutterMarkers[gutterID]) {
+          line.gutterMarkers[gutterID] = null;
+          regLineChange(cm, i, "gutter");
+          if (isEmpty(line.gutterMarkers)) line.gutterMarkers = null;
+        }
+        ++i;
+      });
+    }),
+
+    lineInfo: function(line) {
+      if (typeof line == "number") {
+        if (!isLine(this.doc, line)) return null;
+        var n = line;
+        line = getLine(this.doc, line);
+        if (!line) return null;
+      } else {
+        var n = lineNo(line);
+        if (n == null) return null;
+      }
+      return {line: n, handle: line, text: line.text, gutterMarkers: line.gutterMarkers,
+              textClass: line.textClass, bgClass: line.bgClass, wrapClass: line.wrapClass,
+              widgets: line.widgets};
+    },
+
+    getViewport: function() { return {from: this.display.viewFrom, to: this.display.viewTo};},
+
+    addWidget: function(pos, node, scroll, vert, horiz) {
+      var display = this.display;
+      pos = cursorCoords(this, clipPos(this.doc, pos));
+      var top = pos.bottom, left = pos.left;
+      node.style.position = "absolute";
+      node.setAttribute("cm-ignore-events", "true");
+      this.display.input.setUneditable(node);
+      display.sizer.appendChild(node);
+      if (vert == "over") {
+        top = pos.top;
+      } else if (vert == "above" || vert == "near") {
+        var vspace = Math.max(display.wrapper.clientHeight, this.doc.height),
+        hspace = Math.max(display.sizer.clientWidth, display.lineSpace.clientWidth);
+        // Default to positioning above (if specified and possible); otherwise default to positioning below
+        if ((vert == 'above' || pos.bottom + node.offsetHeight > vspace) && pos.top > node.offsetHeight)
+          top = pos.top - node.offsetHeight;
+        else if (pos.bottom + node.offsetHeight <= vspace)
+          top = pos.bottom;
+        if (left + node.offsetWidth > hspace)
+          left = hspace - node.offsetWidth;
+      }
+      node.style.top = top + "px";
+      node.style.left = node.style.right = "";
+      if (horiz == "right") {
+        left = display.sizer.clientWidth - node.offsetWidth;
+        node.style.right = "0px";
+      } else {
+        if (horiz == "left") left = 0;
+        else if (horiz == "middle") left = (display.sizer.clientWidth - node.offsetWidth) / 2;
+        node.style.left = left + "px";
+      }
+      if (scroll)
+        scrollIntoView(this, left, top, left + node.offsetWidth, top + node.offsetHeight);
+    },
+
+    triggerOnKeyDown: methodOp(onKeyDown),
+    triggerOnKeyPress: methodOp(onKeyPress),
+    triggerOnKeyUp: onKeyUp,
+
+    execCommand: function(cmd) {
+      if (commands.hasOwnProperty(cmd))
+        return commands[cmd].call(null, this);
+    },
+
+    triggerElectric: methodOp(function(text) { triggerElectric(this, text); }),
+
+    findPosH: function(from, amount, unit, visually) {
+      var dir = 1;
+      if (amount < 0) { dir = -1; amount = -amount; }
+      for (var i = 0, cur = clipPos(this.doc, from); i < amount; ++i) {
+        cur = findPosH(this.doc, cur, dir, unit, visually);
+        if (cur.hitSide) break;
+      }
+      return cur;
+    },
+
+    moveH: methodOp(function(dir, unit) {
+      var cm = this;
+      cm.extendSelectionsBy(function(range) {
+        if (cm.display.shift || cm.doc.extend || range.empty())
+          return findPosH(cm.doc, range.head, dir, unit, cm.options.rtlMoveVisually);
+        else
+          return dir < 0 ? range.from() : range.to();
+      }, sel_move);
+    }),
+
+    deleteH: methodOp(function(dir, unit) {
+      var sel = this.doc.sel, doc = this.doc;
+      if (sel.somethingSelected())
+        doc.replaceSelection("", null, "+delete");
+      else
+        deleteNearSelection(this, function(range) {
+          var other = findPosH(doc, range.head, dir, unit, false);
+          return dir < 0 ? {from: other, to: range.head} : {from: range.head, to: other};
+        });
+    }),
+
+    findPosV: function(from, amount, unit, goalColumn) {
+      var dir = 1, x = goalColumn;
+      if (amount < 0) { dir = -1; amount = -amount; }
+      for (var i = 0, cur = clipPos(this.doc, from); i < amount; ++i) {
+        var coords = cursorCoords(this, cur, "div");
+        if (x == null) x = coords.left;
+        else coords.left = x;
+        cur = findPosV(this, coords, dir, unit);
+        if (cur.hitSide) break;
+      }
+      return cur;
+    },
+
+    moveV: methodOp(function(dir, unit) {
+      var cm = this, doc = this.doc, goals = [];
+      var collapse = !cm.display.shift && !doc.extend && doc.sel.somethingSelected();
+      doc.extendSelectionsBy(function(range) {
+        if (collapse)
+          return dir < 0 ? range.from() : range.to();
+        var headPos = cursorCoords(cm, range.head, "div");
+        if (range.goalColumn != null) headPos.left = range.goalColumn;
+        goals.push(headPos.left);
+        var pos = findPosV(cm, headPos, dir, unit);
+        if (unit == "page" && range == doc.sel.primary())
+          addToScrollPos(cm, null, charCoords(cm, pos, "div").top - headPos.top);
+        return pos;
+      }, sel_move);
+      if (goals.length) for (var i = 0; i < doc.sel.ranges.length; i++)
+        doc.sel.ranges[i].goalColumn = goals[i];
+    }),
+
+    // Find the word at the given position (as returned by coordsChar).
+    findWordAt: function(pos) {
+      var doc = this.doc, line = getLine(doc, pos.line).text;
+      var start = pos.ch, end = pos.ch;
+      if (line) {
+        var helper = this.getHelper(pos, "wordChars");
+        if ((pos.xRel < 0 || end == line.length) && start) --start; else ++end;
+        var startChar = line.charAt(start);
+        var check = isWordChar(startChar, helper)
+          ? function(ch) { return isWordChar(ch, helper); }
+          : /\s/.test(startChar) ? function(ch) {return /\s/.test(ch);}
+          : function(ch) {return !/\s/.test(ch) && !isWordChar(ch);};
+        while (start > 0 && check(line.charAt(start - 1))) --start;
+        while (end < line.length && check(line.charAt(end))) ++end;
+      }
+      return new Range(Pos(pos.line, start), Pos(pos.line, end));
+    },
+
+    toggleOverwrite: function(value) {
+      if (value != null && value == this.state.overwrite) return;
+      if (this.state.overwrite = !this.state.overwrite)
+        addClass(this.display.cursorDiv, "CodeMirror-overwrite");
+      else
+        rmClass(this.display.cursorDiv, "CodeMirror-overwrite");
+
+      signal(this, "overwriteToggle", this, this.state.overwrite);
+    },
+    hasFocus: function() { return this.display.input.getField() == activeElt(); },
+
+    scrollTo: methodOp(function(x, y) {
+      if (x != null || y != null) resolveScrollToPos(this);
+      if (x != null) this.curOp.scrollLeft = x;
+      if (y != null) this.curOp.scrollTop = y;
+    }),
+    getScrollInfo: function() {
+      var scroller = this.display.scroller;
+      return {left: scroller.scrollLeft, top: scroller.scrollTop,
+              height: scroller.scrollHeight - scrollGap(this) - this.display.barHeight,
+              width: scroller.scrollWidth - scrollGap(this) - this.display.barWidth,
+              clientHeight: displayHeight(this), clientWidth: displayWidth(this)};
+    },
+
+    scrollIntoView: methodOp(function(range, margin) {
+      if (range == null) {
+        range = {from: this.doc.sel.primary().head, to: null};
+        if (margin == null) margin = this.options.cursorScrollMargin;
+      } else if (typeof range == "number") {
+        range = {from: Pos(range, 0), to: null};
+      } else if (range.from == null) {
+        range = {from: range, to: null};
+      }
+      if (!range.to) range.to = range.from;
+      range.margin = margin || 0;
+
+      if (range.from.line != null) {
+        resolveScrollToPos(this);
+        this.curOp.scrollToPos = range;
+      } else {
+        var sPos = calculateScrollPos(this, Math.min(range.from.left, range.to.left),
+                                      Math.min(range.from.top, range.to.top) - range.margin,
+                                      Math.max(range.from.right, range.to.right),
+                                      Math.max(range.from.bottom, range.to.bottom) + range.margin);
+        this.scrollTo(sPos.scrollLeft, sPos.scrollTop);
+      }
+    }),
+
+    setSize: methodOp(function(width, height) {
+      var cm = this;
+      function interpret(val) {
+        return typeof val == "number" || /^\d+$/.test(String(val)) ? val + "px" : val;
+      }
+      if (width != null) cm.display.wrapper.style.width = interpret(width);
+      if (height != null) cm.display.wrapper.style.height = interpret(height);
+      if (cm.options.lineWrapping) clearLineMeasurementCache(this);
+      var lineNo = cm.display.viewFrom;
+      cm.doc.iter(lineNo, cm.display.viewTo, function(line) {
+        if (line.widgets) for (var i = 0; i < line.widgets.length; i++)
+          if (line.widgets[i].noHScroll) { regLineChange(cm, lineNo, "widget"); break; }
+        ++lineNo;
+      });
+      cm.curOp.forceUpdate = true;
+      signal(cm, "refresh", this);
+    }),
+
+    operation: function(f){return runInOp(this, f);},
+
+    refresh: methodOp(function() {
+      var oldHeight = this.display.cachedTextHeight;
+      regChange(this);
+      this.curOp.forceUpdate = true;
+      clearCaches(this);
+      this.scrollTo(this.doc.scrollLeft, this.doc.scrollTop);
+      updateGutterSpace(this);
+      if (oldHeight == null || Math.abs(oldHeight - textHeight(this.display)) > .5)
+        estimateLineHeights(this);
+      signal(this, "refresh", this);
+    }),
+
+    swapDoc: methodOp(function(doc) {
+      var old = this.doc;
+      old.cm = null;
+      attachDoc(this, doc);
+      clearCaches(this);
+      this.display.input.reset();
+      this.scrollTo(doc.scrollLeft, doc.scrollTop);
+      this.curOp.forceScroll = true;
+      signalLater(this, "swapDoc", this, old);
+      return old;
+    }),
+
+    getInputField: function(){return this.display.input.getField();},
+    getWrapperElement: function(){return this.display.wrapper;},
+    getScrollerElement: function(){return this.display.scroller;},
+    getGutterElement: function(){return this.display.gutters;}
+  };
+  eventMixin(CodeMirror);
+
+  // OPTION DEFAULTS
+
+  // The default configuration options.
+  var defaults = CodeMirror.defaults = {};
+  // Functions to run when options are changed.
+  var optionHandlers = CodeMirror.optionHandlers = {};
+
+  function option(name, deflt, handle, notOnInit) {
+    CodeMirror.defaults[name] = deflt;
+    if (handle) optionHandlers[name] =
+      notOnInit ? function(cm, val, old) {if (old != Init) handle(cm, val, old);} : handle;
+  }
+
+  // Passed to option handlers when there is no old value.
+  var Init = CodeMirror.Init = {toString: function(){return "CodeMirror.Init";}};
+
+  // These two are, on init, called from the constructor because they
+  // have to be initialized before the editor can start at all.
+  option("value", "", function(cm, val) {
+    cm.setValue(val);
+  }, true);
+  option("mode", null, function(cm, val) {
+    cm.doc.modeOption = val;
+    loadMode(cm);
+  }, true);
+
+  option("indentUnit", 2, loadMode, true);
+  option("indentWithTabs", false);
+  option("smartIndent", true);
+  option("tabSize", 4, function(cm) {
+    resetModeState(cm);
+    clearCaches(cm);
+    regChange(cm);
+  }, true);
+  option("lineSeparator", null, function(cm, val) {
+    cm.doc.lineSep = val;
+    if (!val) return;
+    var newBreaks = [], lineNo = cm.doc.first;
+    cm.doc.iter(function(line) {
+      for (var pos = 0;;) {
+        var found = line.text.indexOf(val, pos);
+        if (found == -1) break;
+        pos = found + val.length;
+        newBreaks.push(Pos(lineNo, found));
+      }
+      lineNo++;
+    });
+    for (var i = newBreaks.length - 1; i >= 0; i--)
+      replaceRange(cm.doc, val, newBreaks[i], Pos(newBreaks[i].line, newBreaks[i].ch + val.length))
+  });
+  option("specialChars", /[\t\u0000-\u0019\u00ad\u200b-\u200f\u2028\u2029\ufeff]/g, function(cm, val, old) {
+    cm.state.specialChars = new RegExp(val.source + (val.test("\t") ? "" : "|\t"), "g");
+    if (old != CodeMirror.Init) cm.refresh();
+  });
+  option("specialCharPlaceholder", defaultSpecialCharPlaceholder, function(cm) {cm.refresh();}, true);
+  option("electricChars", true);
+  option("inputStyle", mobile ? "contenteditable" : "textarea", function() {
+    throw new Error("inputStyle can not (yet) be changed in a running editor"); // FIXME
+  }, true);
+  option("rtlMoveVisually", !windows);
+  option("wholeLineUpdateBefore", true);
+
+  option("theme", "default", function(cm) {
+    themeChanged(cm);
+    guttersChanged(cm);
+  }, true);
+  option("keyMap", "default", function(cm, val, old) {
+    var next = getKeyMap(val);
+    var prev = old != CodeMirror.Init && getKeyMap(old);
+    if (prev && prev.detach) prev.detach(cm, next);
+    if (next.attach) next.attach(cm, prev || null);
+  });
+  option("extraKeys", null);
+
+  option("lineWrapping", false, wrappingChanged, true);
+  option("gutters", [], function(cm) {
+    setGuttersForLineNumbers(cm.options);
+    guttersChanged(cm);
+  }, true);
+  option("fixedGutter", true, function(cm, val) {
+    cm.display.gutters.style.left = val ? compensateForHScroll(cm.display) + "px" : "0";
+    cm.refresh();
+  }, true);
+  option("coverGutterNextToScrollbar", false, function(cm) {updateScrollbars(cm);}, true);
+  option("scrollbarStyle", "native", function(cm) {
+    initScrollbars(cm);
+    updateScrollbars(cm);
+    cm.display.scrollbars.setScrollTop(cm.doc.scrollTop);
+    cm.display.scrollbars.setScrollLeft(cm.doc.scrollLeft);
+  }, true);
+  option("lineNumbers", false, function(cm) {
+    setGuttersForLineNumbers(cm.options);
+    guttersChanged(cm);
+  }, true);
+  option("firstLineNumber", 1, guttersChanged, true);
+  option("lineNumberFormatter", function(integer) {return integer;}, guttersChanged, true);
+  option("showCursorWhenSelecting", false, updateSelection, true);
+
+  option("resetSelectionOnContextMenu", true);
+  option("lineWiseCopyCut", true);
+
+  option("readOnly", false, function(cm, val) {
+    if (val == "nocursor") {
+      onBlur(cm);
+      cm.display.input.blur();
+      cm.display.disabled = true;
+    } else {
+      cm.display.disabled = false;
+      if (!val) cm.display.input.reset();
+    }
+  });
+  option("disableInput", false, function(cm, val) {if (!val) cm.display.input.reset();}, true);
+  option("dragDrop", true, dragDropChanged);
+
+  option("cursorBlinkRate", 530);
+  option("cursorScrollMargin", 0);
+  option("cursorHeight", 1, updateSelection, true);
+  option("singleCursorHeightPerLine", true, updateSelection, true);
+  option("workTime", 100);
+  option("workDelay", 100);
+  option("flattenSpans", true, resetModeState, true);
+  option("addModeClass", false, resetModeState, true);
+  option("pollInterval", 100);
+  option("undoDepth", 200, function(cm, val){cm.doc.history.undoDepth = val;});
+  option("historyEventDelay", 1250);
+  option("viewportMargin", 10, function(cm){cm.refresh();}, true);
+  option("maxHighlightLength", 10000, resetModeState, true);
+  option("moveInputWithCursor", true, function(cm, val) {
+    if (!val) cm.display.input.resetPosition();
+  });
+
+  option("tabindex", null, function(cm, val) {
+    cm.display.input.getField().tabIndex = val || "";
+  });
+  option("autofocus", null);
+
+  // MODE DEFINITION AND QUERYING
+
+  // Known modes, by name and by MIME
+  var modes = CodeMirror.modes = {}, mimeModes = CodeMirror.mimeModes = {};
+
+  // Extra arguments are stored as the mode's dependencies, which is
+  // used by (legacy) mechanisms like loadmode.js to automatically
+  // load a mode. (Preferred mechanism is the require/define calls.)
+  CodeMirror.defineMode = function(name, mode) {
+    if (!CodeMirror.defaults.mode && name != "null") CodeMirror.defaults.mode = name;
+    if (arguments.length > 2)
+      mode.dependencies = Array.prototype.slice.call(arguments, 2);
+    modes[name] = mode;
+  };
+
+  CodeMirror.defineMIME = function(mime, spec) {
+    mimeModes[mime] = spec;
+  };
+
+  // Given a MIME type, a {name, ...options} config object, or a name
+  // string, return a mode config object.
+  CodeMirror.resolveMode = function(spec) {
+    if (typeof spec == "string" && mimeModes.hasOwnProperty(spec)) {
+      spec = mimeModes[spec];
+    } else if (spec && typeof spec.name == "string" && mimeModes.hasOwnProperty(spec.name)) {
+      var found = mimeModes[spec.name];
+      if (typeof found == "string") found = {name: found};
+      spec = createObj(found, spec);
+      spec.name = found.name;
+    } else if (typeof spec == "string" && /^[\w\-]+\/[\w\-]+\+xml$/.test(spec)) {
+      return CodeMirror.resolveMode("application/xml");
+    }
+    if (typeof spec == "string") return {name: spec};
+    else return spec || {name: "null"};
+  };
+
+  // Given a mode spec (anything that resolveMode accepts), find and
+  // initialize an actual mode object.
+  CodeMirror.getMode = function(options, spec) {
+    var spec = CodeMirror.resolveMode(spec);
+    var mfactory = modes[spec.name];
+    if (!mfactory) return CodeMirror.getMode(options, "text/plain");
+    var modeObj = mfactory(options, spec);
+    if (modeExtensions.hasOwnProperty(spec.name)) {
+      var exts = modeExtensions[spec.name];
+      for (var prop in exts) {
+        if (!exts.hasOwnProperty(prop)) continue;
+        if (modeObj.hasOwnProperty(prop)) modeObj["_" + prop] = modeObj[prop];
+        modeObj[prop] = exts[prop];
+      }
+    }
+    modeObj.name = spec.name;
+    if (spec.helperType) modeObj.helperType = spec.helperType;
+    if (spec.modeProps) for (var prop in spec.modeProps)
+      modeObj[prop] = spec.modeProps[prop];
+
+    return modeObj;
+  };
+
+  // Minimal default mode.
+  CodeMirror.defineMode("null", function() {
+    return {token: function(stream) {stream.skipToEnd();}};
+  });
+  CodeMirror.defineMIME("text/plain", "null");
+
+  // This can be used to attach properties to mode objects from
+  // outside the actual mode definition.
+  var modeExtensions = CodeMirror.modeExtensions = {};
+  CodeMirror.extendMode = function(mode, properties) {
+    var exts = modeExtensions.hasOwnProperty(mode) ? modeExtensions[mode] : (modeExtensions[mode] = {});
+    copyObj(properties, exts);
+  };
+
+  // EXTENSIONS
+
+  CodeMirror.defineExtension = function(name, func) {
+    CodeMirror.prototype[name] = func;
+  };
+  CodeMirror.defineDocExtension = function(name, func) {
+    Doc.prototype[name] = func;
+  };
+  CodeMirror.defineOption = option;
+
+  var initHooks = [];
+  CodeMirror.defineInitHook = function(f) {initHooks.push(f);};
+
+  var helpers = CodeMirror.helpers = {};
+  CodeMirror.registerHelper = function(type, name, value) {
+    if (!helpers.hasOwnProperty(type)) helpers[type] = CodeMirror[type] = {_global: []};
+    helpers[type][name] = value;
+  };
+  CodeMirror.registerGlobalHelper = function(type, name, predicate, value) {
+    CodeMirror.registerHelper(type, name, value);
+    helpers[type]._global.push({pred: predicate, val: value});
+  };
+
+  // MODE STATE HANDLING
+
+  // Utility functions for working with state. Exported because nested
+  // modes need to do this for their inner modes.
+
+  var copyState = CodeMirror.copyState = function(mode, state) {
+    if (state === true) return state;
+    if (mode.copyState) return mode.copyState(state);
+    var nstate = {};
+    for (var n in state) {
+      var val = state[n];
+      if (val instanceof Array) val = val.concat([]);
+      nstate[n] = val;
+    }
+    return nstate;
+  };
+
+  var startState = CodeMirror.startState = function(mode, a1, a2) {
+    return mode.startState ? mode.startState(a1, a2) : true;
+  };
+
+  // Given a mode and a state (for that mode), find the inner mode and
+  // state at the position that the state refers to.
+  CodeMirror.innerMode = function(mode, state) {
+    while (mode.innerMode) {
+      var info = mode.innerMode(state);
+      if (!info || info.mode == mode) break;
+      state = info.state;
+      mode = info.mode;
+    }
+    return info || {mode: mode, state: state};
+  };
+
+  // STANDARD COMMANDS
+
+  // Commands are parameter-less actions that can be performed on an
+  // editor, mostly used for keybindings.
+  var commands = CodeMirror.commands = {
+    selectAll: function(cm) {cm.setSelection(Pos(cm.firstLine(), 0), Pos(cm.lastLine()), sel_dontScroll);},
+    singleSelection: function(cm) {
+      cm.setSelection(cm.getCursor("anchor"), cm.getCursor("head"), sel_dontScroll);
+    },
+    killLine: function(cm) {
+      deleteNearSelection(cm, function(range) {
+        if (range.empty()) {
+          var len = getLine(cm.doc, range.head.line).text.length;
+          if (range.head.ch == len && range.head.line < cm.lastLine())
+            return {from: range.head, to: Pos(range.head.line + 1, 0)};
+          else
+            return {from: range.head, to: Pos(range.head.line, len)};
+        } else {
+          return {from: range.from(), to: range.to()};
+        }
+      });
+    },
+    deleteLine: function(cm) {
+      deleteNearSelection(cm, function(range) {
+        return {from: Pos(range.from().line, 0),
+                to: clipPos(cm.doc, Pos(range.to().line + 1, 0))};
+      });
+    },
+    delLineLeft: function(cm) {
+      deleteNearSelection(cm, function(range) {
+        return {from: Pos(range.from().line, 0), to: range.from()};
+      });
+    },
+    delWrappedLineLeft: function(cm) {
+      deleteNearSelection(cm, function(range) {
+        var top = cm.charCoords(range.head, "div").top + 5;
+        var leftPos = cm.coordsChar({left: 0, top: top}, "div");
+        return {from: leftPos, to: range.from()};
+      });
+    },
+    delWrappedLineRight: function(cm) {
+      deleteNearSelection(cm, function(range) {
+        var top = cm.charCoords(range.head, "div").top + 5;
+        var rightPos = cm.coordsChar({left: cm.display.lineDiv.offsetWidth + 100, top: top}, "div");
+        return {from: range.from(), to: rightPos };
+      });
+    },
+    undo: function(cm) {cm.undo();},
+    redo: function(cm) {cm.redo();},
+    undoSelection: function(cm) {cm.undoSelection();},
+    redoSelection: function(cm) {cm.redoSelection();},
+    goDocStart: function(cm) {cm.extendSelection(Pos(cm.firstLine(), 0));},
+    goDocEnd: function(cm) {cm.extendSelection(Pos(cm.lastLine()));},
+    goLineStart: function(cm) {
+      cm.extendSelectionsBy(function(range) { return lineStart(cm, range.head.line); },
+                            {origin: "+move", bias: 1});
+    },
+    goLineStartSmart: function(cm) {
+      cm.extendSelectionsBy(function(range) {
+        return lineStartSmart(cm, range.head);
+      }, {origin: "+move", bias: 1});
+    },
+    goLineEnd: function(cm) {
+      cm.extendSelectionsBy(function(range) { return lineEnd(cm, range.head.line); },
+                            {origin: "+move", bias: -1});
+    },
+    goLineRight: function(cm) {
+      cm.extendSelectionsBy(function(range) {
+        var top = cm.charCoords(range.head, "div").top + 5;
+        return cm.coordsChar({left: cm.display.lineDiv.offsetWidth + 100, top: top}, "div");
+      }, sel_move);
+    },
+    goLineLeft: function(cm) {
+      cm.extendSelectionsBy(function(range) {
+        var top = cm.charCoords(range.head, "div").top + 5;
+        return cm.coordsChar({left: 0, top: top}, "div");
+      }, sel_move);
+    },
+    goLineLeftSmart: function(cm) {
+      cm.extendSelectionsBy(function(range) {
+        var top = cm.charCoords(range.head, "div").top + 5;
+        var pos = cm.coordsChar({left: 0, top: top}, "div");
+        if (pos.ch < cm.getLine(pos.line).search(/\S/)) return lineStartSmart(cm, range.head);
+        return pos;
+      }, sel_move);
+    },
+    goLineUp: function(cm) {cm.moveV(-1, "line");},
+    goLineDown: function(cm) {cm.moveV(1, "line");},
+    goPageUp: function(cm) {cm.moveV(-1, "page");},
+    goPageDown: function(cm) {cm.moveV(1, "page");},
+    goCharLeft: function(cm) {cm.moveH(-1, "char");},
+    goCharRight: function(cm) {cm.moveH(1, "char");},
+    goColumnLeft: function(cm) {cm.moveH(-1, "column");},
+    goColumnRight: function(cm) {cm.moveH(1, "column");},
+    goWordLeft: function(cm) {cm.moveH(-1, "word");},
+    goGroupRight: function(cm) {cm.moveH(1, "group");},
+    goGroupLeft: function(cm) {cm.moveH(-1, "group");},
+    goWordRight: function(cm) {cm.moveH(1, "word");},
+    delCharBefore: function(cm) {cm.deleteH(-1, "char");},
+    delCharAfter: function(cm) {cm.deleteH(1, "char");},
+    delWordBefore: function(cm) {cm.deleteH(-1, "word");},
+    delWordAfter: function(cm) {cm.deleteH(1, "word");},
+    delGroupBefore: function(cm) {cm.deleteH(-1, "group");},
+    delGroupAfter: function(cm) {cm.deleteH(1, "group");},
+    indentAuto: function(cm) {cm.indentSelection("smart");},
+    indentMore: function(cm) {cm.indentSelection("add");},
+    indentLess: function(cm) {cm.indentSelection("subtract");},
+    insertTab: function(cm) {cm.replaceSelection("\t");},
+    insertSoftTab: function(cm) {
+      var spaces = [], ranges = cm.listSelections(), tabSize = cm.options.tabSize;
+      for (var i = 0; i < ranges.length; i++) {
+        var pos = ranges[i].from();
+        var col = countColumn(cm.getLine(pos.line), pos.ch, tabSize);
+        spaces.push(new Array(tabSize - col % tabSize + 1).join(" "));
+      }
+      cm.replaceSelections(spaces);
+    },
+    defaultTab: function(cm) {
+      if (cm.somethingSelected()) cm.indentSelection("add");
+      else cm.execCommand("insertTab");
+    },
+    transposeChars: function(cm) {
+      runInOp(cm, function() {
+        var ranges = cm.listSelections(), newSel = [];
+        for (var i = 0; i < ranges.length; i++) {
+          var cur = ranges[i].head, line = getLine(cm.doc, cur.line).text;
+          if (line) {
+            if (cur.ch == line.length) cur = new Pos(cur.line, cur.ch - 1);
+            if (cur.ch > 0) {
+              cur = new Pos(cur.line, cur.ch + 1);
+              cm.replaceRange(line.charAt(cur.ch - 1) + line.charAt(cur.ch - 2),
+                              Pos(cur.line, cur.ch - 2), cur, "+transpose");
+            } else if (cur.line > cm.doc.first) {
+              var prev = getLine(cm.doc, cur.line - 1).text;
+              if (prev)
+                cm.replaceRange(line.charAt(0) + cm.doc.lineSeparator() +
+                                prev.charAt(prev.length - 1),
+                                Pos(cur.line - 1, prev.length - 1), Pos(cur.line, 1), "+transpose");
+            }
+          }
+          newSel.push(new Range(cur, cur));
+        }
+        cm.setSelections(newSel);
+      });
+    },
+    newlineAndIndent: function(cm) {
+      runInOp(cm, function() {
+        var len = cm.listSelections().length;
+        for (var i = 0; i < len; i++) {
+          var range = cm.listSelections()[i];
+          cm.replaceRange(cm.doc.lineSeparator(), range.anchor, range.head, "+input");
+          cm.indentLine(range.from().line + 1, null, true);
+          ensureCursorVisible(cm);
+        }
+      });
+    },
+    toggleOverwrite: function(cm) {cm.toggleOverwrite();}
+  };
+
+
+  // STANDARD KEYMAPS
+
+  var keyMap = CodeMirror.keyMap = {};
+
+  keyMap.basic = {
+    "Left": "goCharLeft", "Right": "goCharRight", "Up": "goLineUp", "Down": "goLineDown",
+    "End": "goLineEnd", "Home": "goLineStartSmart", "PageUp": "goPageUp", "PageDown": "goPageDown",
+    "Delete": "delCharAfter", "Backspace": "delCharBefore", "Shift-Backspace": "delCharBefore",
+    "Tab": "defaultTab", "Shift-Tab": "indentAuto",
+    "Enter": "newlineAndIndent", "Insert": "toggleOverwrite",
+    "Esc": "singleSelection"
+  };
+  // Note that the save and find-related commands aren't defined by
+  // default. User code or addons can define them. Unknown commands
+  // are simply ignored.
+  keyMap.pcDefault = {
+    "Ctrl-A": "selectAll", "Ctrl-D": "deleteLine", "Ctrl-Z": "undo", "Shift-Ctrl-Z": "redo", "Ctrl-Y": "redo",
+    "Ctrl-Home": "goDocStart", "Ctrl-End": "goDocEnd", "Ctrl-Up": "goLineUp", "Ctrl-Down": "goLineDown",
+    "Ctrl-Left": "goGroupLeft", "Ctrl-Right": "goGroupRight", "Alt-Left": "goLineStart", "Alt-Right": "goLineEnd",
+    "Ctrl-Backspace": "delGroupBefore", "Ctrl-Delete": "delGroupAfter", "Ctrl-S": "save", "Ctrl-F": "find",
+    "Ctrl-G": "findNext", "Shift-Ctrl-G": "findPrev", "Shift-Ctrl-F": "replace", "Shift-Ctrl-R": "replaceAll",
+    "Ctrl-[": "indentLess", "Ctrl-]": "indentMore",
+    "Ctrl-U": "undoSelection", "Shift-Ctrl-U": "redoSelection", "Alt-U": "redoSelection",
+    fallthrough: "basic"
+  };
+  // Very basic readline/emacs-style bindings, which are standard on Mac.
+  keyMap.emacsy = {
+    "Ctrl-F": "goCharRight", "Ctrl-B": "goCharLeft", "Ctrl-P": "goLineUp", "Ctrl-N": "goLineDown",
+    "Alt-F": "goWordRight", "Alt-B": "goWordLeft", "Ctrl-A": "goLineStart", "Ctrl-E": "goLineEnd",
+    "Ctrl-V": "goPageDown", "Shift-Ctrl-V": "goPageUp", "Ctrl-D": "delCharAfter", "Ctrl-H": "delCharBefore",
+    "Alt-D": "delWordAfter", "Alt-Backspace": "delWordBefore", "Ctrl-K": "killLine", "Ctrl-T": "transposeChars"
+  };
+  keyMap.macDefault = {
+    "Cmd-A": "selectAll", "Cmd-D": "deleteLine", "Cmd-Z": "undo", "Shift-Cmd-Z": "redo", "Cmd-Y": "redo",
+    "Cmd-Home": "goDocStart", "Cmd-Up": "goDocStart", "Cmd-End": "goDocEnd", "Cmd-Down": "goDocEnd", "Alt-Left": "goGroupLeft",
+    "Alt-Right": "goGroupRight", "Cmd-Left": "goLineLeft", "Cmd-Right": "goLineRight", "Alt-Backspace": "delGroupBefore",
+    "Ctrl-Alt-Backspace": "delGroupAfter", "Alt-Delete": "delGroupAfter", "Cmd-S": "save", "Cmd-F": "find",
+    "Cmd-G": "findNext", "Shift-Cmd-G": "findPrev", "Cmd-Alt-F": "replace", "Shift-Cmd-Alt-F": "replaceAll",
+    "Cmd-[": "indentLess", "Cmd-]": "indentMore", "Cmd-Backspace": "delWrappedLineLeft", "Cmd-Delete": "delWrappedLineRight",
+    "Cmd-U": "undoSelection", "Shift-Cmd-U": "redoSelection", "Ctrl-Up": "goDocStart", "Ctrl-Down": "goDocEnd",
+    fallthrough: ["basic", "emacsy"]
+  };
+  keyMap["default"] = mac ? keyMap.macDefault : keyMap.pcDefault;
+
+  // KEYMAP DISPATCH
+
+  function normalizeKeyName(name) {
+    var parts = name.split(/-(?!$)/), name = parts[parts.length - 1];
+    var alt, ctrl, shift, cmd;
+    for (var i = 0; i < parts.length - 1; i++) {
+      var mod = parts[i];
+      if (/^(cmd|meta|m)$/i.test(mod)) cmd = true;
+      else if (/^a(lt)?$/i.test(mod)) alt = true;
+      else if (/^(c|ctrl|control)$/i.test(mod)) ctrl = true;
+      else if (/^s(hift)$/i.test(mod)) shift = true;
+      else throw new Error("Unrecognized modifier name: " + mod);
+    }
+    if (alt) name = "Alt-" + name;
+    if (ctrl) name = "Ctrl-" + name;
+    if (cmd) name = "Cmd-" + name;
+    if (shift) name = "Shift-" + name;
+    return name;
+  }
+
+  // This is a kludge to keep keymaps mostly working as raw objects
+  // (backwards compatibility) while at the same time support features
+  // like normalization and multi-stroke key bindings. It compiles a
+  // new normalized keymap, and then updates the old object to reflect
+  // this.
+  CodeMirror.normalizeKeyMap = function(keymap) {
+    var copy = {};
+    for (var keyname in keymap) if (keymap.hasOwnProperty(keyname)) {
+      var value = keymap[keyname];
+      if (/^(name|fallthrough|(de|at)tach)$/.test(keyname)) continue;
+      if (value == "...") { delete keymap[keyname]; continue; }
+
+      var keys = map(keyname.split(" "), normalizeKeyName);
+      for (var i = 0; i < keys.length; i++) {
+        var val, name;
+        if (i == keys.length - 1) {
+          name = keys.join(" ");
+          val = value;
+        } else {
+          name = keys.slice(0, i + 1).join(" ");
+          val = "...";
+        }
+        var prev = copy[name];
+        if (!prev) copy[name] = val;
+        else if (prev != val) throw new Error("Inconsistent bindings for " + name);
+      }
+      delete keymap[keyname];
+    }
+    for (var prop in copy) keymap[prop] = copy[prop];
+    return keymap;
+  };
+
+  var lookupKey = CodeMirror.lookupKey = function(key, map, handle, context) {
+    map = getKeyMap(map);
+    var found = map.call ? map.call(key, context) : map[key];
+    if (found === false) return "nothing";
+    if (found === "...") return "multi";
+    if (found != null && handle(found)) return "handled";
+
+    if (map.fallthrough) {
+      if (Object.prototype.toString.call(map.fallthrough) != "[object Array]")
+        return lookupKey(key, map.fallthrough, handle, context);
+      for (var i = 0; i < map.fallthrough.length; i++) {
+        var result = lookupKey(key, map.fallthrough[i], handle, context);
+        if (result) return result;
+      }
+    }
+  };
+
+  // Modifier key presses don't count as 'real' key presses for the
+  // purpose of keymap fallthrough.
+  var isModifierKey = CodeMirror.isModifierKey = function(value) {
+    var name = typeof value == "string" ? value : keyNames[value.keyCode];
+    return name == "Ctrl" || name == "Alt" || name == "Shift" || name == "Mod";
+  };
+
+  // Look up the name of a key as indicated by an event object.
+  var keyName = CodeMirror.keyName = function(event, noShift) {
+    if (presto && event.keyCode == 34 && event["char"]) return false;
+    var base = keyNames[event.keyCode], name = base;
+    if (name == null || event.altGraphKey) return false;
+    if (event.altKey && base != "Alt") name = "Alt-" + name;
+    if ((flipCtrlCmd ? event.metaKey : event.ctrlKey) && base != "Ctrl") name = "Ctrl-" + name;
+    if ((flipCtrlCmd ? event.ctrlKey : event.metaKey) && base != "Cmd") name = "Cmd-" + name;
+    if (!noShift && event.shiftKey && base != "Shift") name = "Shift-" + name;
+    return name;
+  };
+
+  function getKeyMap(val) {
+    return typeof val == "string" ? keyMap[val] : val;
+  }
+
+  // FROMTEXTAREA
+
+  CodeMirror.fromTextArea = function(textarea, options) {
+    options = options ? copyObj(options) : {};
+    options.value = textarea.value;
+    if (!options.tabindex && textarea.tabIndex)
+      options.tabindex = textarea.tabIndex;
+    if (!options.placeholder && textarea.placeholder)
+      options.placeholder = textarea.placeholder;
+    // Set autofocus to true if this textarea is focused, or if it has
+    // autofocus and no other element is focused.
+    if (options.autofocus == null) {
+      var hasFocus = activeElt();
+      options.autofocus = hasFocus == textarea ||
+        textarea.getAttribute("autofocus") != null && hasFocus == document.body;
+    }
+
+    function save() {textarea.value = cm.getValue();}
+    if (textarea.form) {
+      on(textarea.form, "submit", save);
+      // Deplorable hack to make the submit method do the right thing.
+      if (!options.leaveSubmitMethodAlone) {
+        var form = textarea.form, realSubmit = form.submit;
+        try {
+          var wrappedSubmit = form.submit = function() {
+            save();
+            form.submit = realSubmit;
+            form.submit();
+            form.submit = wrappedSubmit;
+          };
+        } catch(e) {}
+      }
+    }
+
+    options.finishInit = function(cm) {
+      cm.save = save;
+      cm.getTextArea = function() { return textarea; };
+      cm.toTextArea = function() {
+        cm.toTextArea = isNaN; // Prevent this from being ran twice
+        save();
+        textarea.parentNode.removeChild(cm.getWrapperElement());
+        textarea.style.display = "";
+        if (textarea.form) {
+          off(textarea.form, "submit", save);
+          if (typeof textarea.form.submit == "function")
+            textarea.form.submit = realSubmit;
+        }
+      };
+    };
+
+    textarea.style.display = "none";
+    var cm = CodeMirror(function(node) {
+      textarea.parentNode.insertBefore(node, textarea.nextSibling);
+    }, options);
+    return cm;
+  };
+
+  // STRING STREAM
+
+  // Fed to the mode parsers, provides helper functions to make
+  // parsers more succinct.
+
+  var StringStream = CodeMirror.StringStream = function(string, tabSize) {
+    this.pos = this.start = 0;
+    this.string = string;
+    this.tabSize = tabSize || 8;
+    this.lastColumnPos = this.lastColumnValue = 0;
+    this.lineStart = 0;
+  };
+
+  StringStream.prototype = {
+    eol: function() {return this.pos >= this.string.length;},
+    sol: function() {return this.pos == this.lineStart;},
+    peek: function() {return this.string.charAt(this.pos) || undefined;},
+    next: function() {
+      if (this.pos < this.string.length)
+        return this.string.charAt(this.pos++);
+    },
+    eat: function(match) {
+      var ch = this.string.charAt(this.pos);
+      if (typeof match == "string") var ok = ch == match;
+      else var ok = ch && (match.test ? match.test(ch) : match(ch));
+      if (ok) {++this.pos; return ch;}
+    },
+    eatWhile: function(match) {
+      var start = this.pos;
+      while (this.eat(match)){}
+      return this.pos > start;
+    },
+    eatSpace: function() {
+      var start = this.pos;
+      while (/[\s\u00a0]/.test(this.string.charAt(this.pos))) ++this.pos;
+      return this.pos > start;
+    },
+    skipToEnd: function() {this.pos = this.string.length;},
+    skipTo: function(ch) {
+      var found = this.string.indexOf(ch, this.pos);
+      if (found > -1) {this.pos = found; return true;}
+    },
+    backUp: function(n) {this.pos -= n;},
+    column: function() {
+      if (this.lastColumnPos < this.start) {
+        this.lastColumnValue = countColumn(this.string, this.start, this.tabSize, this.lastColumnPos, this.lastColumnValue);
+        this.lastColumnPos = this.start;
+      }
+      return this.lastColumnValue - (this.lineStart ? countColumn(this.string, this.lineStart, this.tabSize) : 0);
+    },
+    indentation: function() {
+      return countColumn(this.string, null, this.tabSize) -
+        (this.lineStart ? countColumn(this.string, this.lineStart, this.tabSize) : 0);
+    },
+    match: function(pattern, consume, caseInsensitive) {
+      if (typeof pattern == "string") {
+        var cased = function(str) {return caseInsensitive ? str.toLowerCase() : str;};
+        var substr = this.string.substr(this.pos, pattern.length);
+        if (cased(substr) == cased(pattern)) {
+          if (consume !== false) this.pos += pattern.length;
+          return true;
+        }
+      } else {
+        var match = this.string.slice(this.pos).match(pattern);
+        if (match && match.index > 0) return null;
+        if (match && consume !== false) this.pos += match[0].length;
+        return match;
+      }
+    },
+    current: function(){return this.string.slice(this.start, this.pos);},
+    hideFirstChars: function(n, inner) {
+      this.lineStart += n;
+      try { return inner(); }
+      finally { this.lineStart -= n; }
+    }
+  };
+
+  // TEXTMARKERS
+
+  // Created with markText and setBookmark methods. A TextMarker is a
+  // handle that can be used to clear or find a marked position in the
+  // document. Line objects hold arrays (markedSpans) containing
+  // {from, to, marker} object pointing to such marker objects, and
+  // indicating that such a marker is present on that line. Multiple
+  // lines may point to the same marker when it spans across lines.
+  // The spans will have null for their from/to properties when the
+  // marker continues beyond the start/end of the line. Markers have
+  // links back to the lines they currently touch.
+
+  var nextMarkerId = 0;
+
+  var TextMarker = CodeMirror.TextMarker = function(doc, type) {
+    this.lines = [];
+    this.type = type;
+    this.doc = doc;
+    this.id = ++nextMarkerId;
+  };
+  eventMixin(TextMarker);
+
+  // Clear the marker.
+  TextMarker.prototype.clear = function() {
+    if (this.explicitlyCleared) return;
+    var cm = this.doc.cm, withOp = cm && !cm.curOp;
+    if (withOp) startOperation(cm);
+    if (hasHandler(this, "clear")) {
+      var found = this.find();
+      if (found) signalLater(this, "clear", found.from, found.to);
+    }
+    var min = null, max = null;
+    for (var i = 0; i < this.lines.length; ++i) {
+      var line = this.lines[i];
+      var span = getMarkedSpanFor(line.markedSpans, this);
+      if (cm && !this.collapsed) regLineChange(cm, lineNo(line), "text");
+      else if (cm) {
+        if (span.to != null) max = lineNo(line);
+        if (span.from != null) min = lineNo(line);
+      }
+      line.markedSpans = removeMarkedSpan(line.markedSpans, span);
+      if (span.from == null && this.collapsed && !lineIsHidden(this.doc, line) && cm)
+        updateLineHeight(line, textHeight(cm.display));
+    }
+    if (cm && this.collapsed && !cm.options.lineWrapping) for (var i = 0; i < this.lines.length; ++i) {
+      var visual = visualLine(this.lines[i]), len = lineLength(visual);
+      if (len > cm.display.maxLineLength) {
+        cm.display.maxLine = visual;
+        cm.display.maxLineLength = len;
+        cm.display.maxLineChanged = true;
+      }
+    }
+
+    if (min != null && cm && this.collapsed) regChange(cm, min, max + 1);
+    this.lines.length = 0;
+    this.explicitlyCleared = true;
+    if (this.atomic && this.doc.cantEdit) {
+      this.doc.cantEdit = false;
+      if (cm) reCheckSelection(cm.doc);
+    }
+    if (cm) signalLater(cm, "markerCleared", cm, this);
+    if (withOp) endOperation(cm);
+    if (this.parent) this.parent.clear();
+  };
+
+  // Find the position of the marker in the document. Returns a {from,
+  // to} object by default. Side can be passed to get a specific side
+  // -- 0 (both), -1 (left), or 1 (right). When lineObj is true, the
+  // Pos objects returned contain a line object, rather than a line
+  // number (used to prevent looking up the same line twice).
+  TextMarker.prototype.find = function(side, lineObj) {
+    if (side == null && this.type == "bookmark") side = 1;
+    var from, to;
+    for (var i = 0; i < this.lines.length; ++i) {
+      var line = this.lines[i];
+      var span = getMarkedSpanFor(line.markedSpans, this);
+      if (span.from != null) {
+        from = Pos(lineObj ? line : lineNo(line), span.from);
+        if (side == -1) return from;
+      }
+      if (span.to != null) {
+        to = Pos(lineObj ? line : lineNo(line), span.to);
+        if (side == 1) return to;
+      }
+    }
+    return from && {from: from, to: to};
+  };
+
+  // Signals that the marker's widget changed, and surrounding layout
+  // should be recomputed.
+  TextMarker.prototype.changed = function() {
+    var pos = this.find(-1, true), widget = this, cm = this.doc.cm;
+    if (!pos || !cm) return;
+    runInOp(cm, function() {
+      var line = pos.line, lineN = lineNo(pos.line);
+      var view = findViewForLine(cm, lineN);
+      if (view) {
+        clearLineMeasurementCacheFor(view);
+        cm.curOp.selectionChanged = cm.curOp.forceUpdate = true;
+      }
+      cm.curOp.updateMaxLine = true;
+      if (!lineIsHidden(widget.doc, line) && widget.height != null) {
+        var oldHeight = widget.height;
+        widget.height = null;
+        var dHeight = widgetHeight(widget) - oldHeight;
+        if (dHeight)
+          updateLineHeight(line, line.height + dHeight);
+      }
+    });
+  };
+
+  TextMarker.prototype.attachLine = function(line) {
+    if (!this.lines.length && this.doc.cm) {
+      var op = this.doc.cm.curOp;
+      if (!op.maybeHiddenMarkers || indexOf(op.maybeHiddenMarkers, this) == -1)
+        (op.maybeUnhiddenMarkers || (op.maybeUnhiddenMarkers = [])).push(this);
+    }
+    this.lines.push(line);
+  };
+  TextMarker.prototype.detachLine = function(line) {
+    this.lines.splice(indexOf(this.lines, line), 1);
+    if (!this.lines.length && this.doc.cm) {
+      var op = this.doc.cm.curOp;
+      (op.maybeHiddenMarkers || (op.maybeHiddenMarkers = [])).push(this);
+    }
+  };
+
+  // Collapsed markers have unique ids, in order to be able to order
+  // them, which is needed for uniquely determining an outer marker
+  // when they overlap (they may nest, but not partially overlap).
+  var nextMarkerId = 0;
+
+  // Create a marker, wire it up to the right lines, and
+  function markText(doc, from, to, options, type) {
+    // Shared markers (across linked documents) are handled separately
+    // (markTextShared will call out to this again, once per
+    // document).
+    if (options && options.shared) return markTextShared(doc, from, to, options, type);
+    // Ensure we are in an operation.
+    if (doc.cm && !doc.cm.curOp) return operation(doc.cm, markText)(doc, from, to, options, type);
+
+    var marker = new TextMarker(doc, type), diff = cmp(from, to);
+    if (options) copyObj(options, marker, false);
+    // Don't connect empty markers unless clearWhenEmpty is false
+    if (diff > 0 || diff == 0 && marker.clearWhenEmpty !== false)
+      return marker;
+    if (marker.replacedWith) {
+      // Showing up as a widget implies collapsed (widget replaces text)
+      marker.collapsed = true;
+      marker.widgetNode = elt("span", [marker.replacedWith], "CodeMirror-widget");
+      if (!options.handleMouseEvents) marker.widgetNode.setAttribute("cm-ignore-events", "true");
+      if (options.insertLeft) marker.widgetNode.insertLeft = true;
+    }
+    if (marker.collapsed) {
+      if (conflictingCollapsedRange(doc, from.line, from, to, marker) ||
+          from.line != to.line && conflictingCollapsedRange(doc, to.line, from, to, marker))
+        throw new Error("Inserting collapsed marker partially overlapping an existing one");
+      sawCollapsedSpans = true;
+    }
+
+    if (marker.addToHistory)
+      addChangeToHistory(doc, {from: from, to: to, origin: "markText"}, doc.sel, NaN);
+
+    var curLine = from.line, cm = doc.cm, updateMaxLine;
+    doc.iter(curLine, to.line + 1, function(line) {
+      if (cm && marker.collapsed && !cm.options.lineWrapping && visualLine(line) == cm.display.maxLine)
+        updateMaxLine = true;
+      if (marker.collapsed && curLine != from.line) updateLineHeight(line, 0);
+      addMarkedSpan(line, new MarkedSpan(marker,
+                                         curLine == from.line ? from.ch : null,
+                                         curLine == to.line ? to.ch : null));
+      ++curLine;
+    });
+    // lineIsHidden depends on the presence of the spans, so needs a second pass
+    if (marker.collapsed) doc.iter(from.line, to.line + 1, function(line) {
+      if (lineIsHidden(doc, line)) updateLineHeight(line, 0);
+    });
+
+    if (marker.clearOnEnter) on(marker, "beforeCursorEnter", function() { marker.clear(); });
+
+    if (marker.readOnly) {
+      sawReadOnlySpans = true;
+      if (doc.history.done.length || doc.history.undone.length)
+        doc.clearHistory();
+    }
+    if (marker.collapsed) {
+      marker.id = ++nextMarkerId;
+      marker.atomic = true;
+    }
+    if (cm) {
+      // Sync editor state
+      if (updateMaxLine) cm.curOp.updateMaxLine = true;
+      if (marker.collapsed)
+        regChange(cm, from.line, to.line + 1);
+      else if (marker.className || marker.title || marker.startStyle || marker.endStyle || marker.css)
+        for (var i = from.line; i <= to.line; i++) regLineChange(cm, i, "text");
+      if (marker.atomic) reCheckSelection(cm.doc);
+      signalLater(cm, "markerAdded", cm, marker);
+    }
+    return marker;
+  }
+
+  // SHARED TEXTMARKERS
+
+  // A shared marker spans multiple linked documents. It is
+  // implemented as a meta-marker-object controlling multiple normal
+  // markers.
+  var SharedTextMarker = CodeMirror.SharedTextMarker = function(markers, primary) {
+    this.markers = markers;
+    this.primary = primary;
+    for (var i = 0; i < markers.length; ++i)
+      markers[i].parent = this;
+  };
+  eventMixin(SharedTextMarker);
+
+  SharedTextMarker.prototype.clear = function() {
+    if (this.explicitlyCleared) return;
+    this.explicitlyCleared = true;
+    for (var i = 0; i < this.markers.length; ++i)
+      this.markers[i].clear();
+    signalLater(this, "clear");
+  };
+  SharedTextMarker.prototype.find = function(side, lineObj) {
+    return this.primary.find(side, lineObj);
+  };
+
+  function markTextShared(doc, from, to, options, type) {
+    options = copyObj(options);
+    options.shared = false;
+    var markers = [markText(doc, from, to, options, type)], primary = markers[0];
+    var widget = options.widgetNode;
+    linkedDocs(doc, function(doc) {
+      if (widget) options.widgetNode = widget.cloneNode(true);
+      markers.push(markText(doc, clipPos(doc, from), clipPos(doc, to), options, type));
+      for (var i = 0; i < doc.linked.length; ++i)
+        if (doc.linked[i].isParent) return;
+      primary = lst(markers);
+    });
+    return new SharedTextMarker(markers, primary);
+  }
+
+  function findSharedMarkers(doc) {
+    return doc.findMarks(Pos(doc.first, 0), doc.clipPos(Pos(doc.lastLine())),
+                         function(m) { return m.parent; });
+  }
+
+  function copySharedMarkers(doc, markers) {
+    for (var i = 0; i < markers.length; i++) {
+      var marker = markers[i], pos = marker.find();
+      var mFrom = doc.clipPos(pos.from), mTo = doc.clipPos(pos.to);
+      if (cmp(mFrom, mTo)) {
+        var subMark = markText(doc, mFrom, mTo, marker.primary, marker.primary.type);
+        marker.markers.push(subMark);
+        subMark.parent = marker;
+      }
+    }
+  }
+
+  function detachSharedMarkers(markers) {
+    for (var i = 0; i < markers.length; i++) {
+      var marker = markers[i], linked = [marker.primary.doc];;
+      linkedDocs(marker.primary.doc, function(d) { linked.push(d); });
+      for (var j = 0; j < marker.markers.length; j++) {
+        var subMarker = marker.markers[j];
+        if (indexOf(linked, subMarker.doc) == -1) {
+          subMarker.parent = null;
+          marker.markers.splice(j--, 1);
+        }
+      }
+    }
+  }
+
+  // TEXTMARKER SPANS
+
+  function MarkedSpan(marker, from, to) {
+    this.marker = marker;
+    this.from = from; this.to = to;
+  }
+
+  // Search an array of spans for a span matching the given marker.
+  function getMarkedSpanFor(spans, marker) {
+    if (spans) for (var i = 0; i < spans.length; ++i) {
+      var span = spans[i];
+      if (span.marker == marker) return span;
+    }
+  }
+  // Remove a span from an array, returning undefined if no spans are
+  // left (we don't store arrays for lines without spans).
+  function removeMarkedSpan(spans, span) {
+    for (var r, i = 0; i < spans.length; ++i)
+      if (spans[i] != span) (r || (r = [])).push(spans[i]);
+    return r;
+  }
+  // Add a span to a line.
+  function addMarkedSpan(line, span) {
+    line.markedSpans = line.markedSpans ? line.markedSpans.concat([span]) : [span];
+    span.marker.attachLine(line);
+  }
+
+  // Used for the algorithm that adjusts markers for a change in the
+  // document. These functions cut an array of spans at a given
+  // character position, returning an array of remaining chunks (or
+  // undefined if nothing remains).
+  function markedSpansBefore(old, startCh, isInsert) {
+    if (old) for (var i = 0, nw; i < old.length; ++i) {
+      var span = old[i], marker = span.marker;
+      var startsBefore = span.from == null || (marker.inclusiveLeft ? span.from <= startCh : span.from < startCh);
+      if (startsBefore || span.from == startCh && marker.type == "bookmark" && (!isInsert || !span.marker.insertLeft)) {
+        var endsAfter = span.to == null || (marker.inclusiveRight ? span.to >= startCh : span.to > startCh);
+        (nw || (nw = [])).push(new MarkedSpan(marker, span.from, endsAfter ? null : span.to));
+      }
+    }
+    return nw;
+  }
+  function markedSpansAfter(old, endCh, isInsert) {
+    if (old) for (var i = 0, nw; i < old.length; ++i) {
+      var span = old[i], marker = span.marker;
+      var endsAfter = span.to == null || (marker.inclusiveRight ? span.to >= endCh : span.to > endCh);
+      if (endsAfter || span.from == endCh && marker.type == "bookmark" && (!isInsert || span.marker.insertLeft)) {
+        var startsBefore = span.from == null || (marker.inclusiveLeft ? span.from <= endCh : span.from < endCh);
+        (nw || (nw = [])).push(new MarkedSpan(marker, startsBefore ? null : span.from - endCh,
+                                              span.to == null ? null : span.to - endCh));
+      }
+    }
+    return nw;
+  }
+
+  // Given a change object, compute the new set of marker spans that
+  // cover the line in which the change took place. Removes spans
+  // entirely within the change, reconnects spans belonging to the
+  // same marker that appear on both sides of the change, and cuts off
+  // spans partially within the change. Returns an array of span
+  // arrays with one element for each line in (after) the change.
+  function stretchSpansOverChange(doc, change) {
+    if (change.full) return null;
+    var oldFirst = isLine(doc, change.from.line) && getLine(doc, change.from.line).markedSpans;
+    var oldLast = isLine(doc, change.to.line) && getLine(doc, change.to.line).markedSpans;
+    if (!oldFirst && !oldLast) return null;
+
+    var startCh = change.from.ch, endCh = change.to.ch, isInsert = cmp(change.from, change.to) == 0;
+    // Get the spans that 'stick out' on both sides
+    var first = markedSpansBefore(oldFirst, startCh, isInsert);
+    var last = markedSpansAfter(oldLast, endCh, isInsert);
+
+    // Next, merge those two ends
+    var sameLine = change.text.length == 1, offset = lst(change.text).length + (sameLine ? startCh : 0);
+    if (first) {
+      // Fix up .to properties of first
+      for (var i = 0; i < first.length; ++i) {
+        var span = first[i];
+        if (span.to == null) {
+          var found = getMarkedSpanFor(last, span.marker);
+          if (!found) span.to = startCh;
+          else if (sameLine) span.to = found.to == null ? null : found.to + offset;
+        }
+      }
+    }
+    if (last) {
+      // Fix up .from in last (or move them into first in case of sameLine)
+      for (var i = 0; i < last.length; ++i) {
+        var span = last[i];
+        if (span.to != null) span.to += offset;
+        if (span.from == null) {
+          var found = getMarkedSpanFor(first, span.marker);
+          if (!found) {
+            span.from = offset;
+            if (sameLine) (first || (first = [])).push(span);
+          }
+        } else {
+          span.from += offset;
+          if (sameLine) (first || (first = [])).push(span);
+        }
+      }
+    }
+    // Make sure we didn't create any zero-length spans
+    if (first) first = clearEmptySpans(first);
+    if (last && last != first) last = clearEmptySpans(last);
+
+    var newMarkers = [first];
+    if (!sameLine) {
+      // Fill gap with whole-line-spans
+      var gap = change.text.length - 2, gapMarkers;
+      if (gap > 0 && first)
+        for (var i = 0; i < first.length; ++i)
+          if (first[i].to == null)
+            (gapMarkers || (gapMarkers = [])).push(new MarkedSpan(first[i].marker, null, null));
+      for (var i = 0; i < gap; ++i)
+        newMarkers.push(gapMarkers);
+      newMarkers.push(last);
+    }
+    return newMarkers;
+  }
+
+  // Remove spans that are empty and don't have a clearWhenEmpty
+  // option of false.
+  function clearEmptySpans(spans) {
+    for (var i = 0; i < spans.length; ++i) {
+      var span = spans[i];
+      if (span.from != null && span.from == span.to && span.marker.clearWhenEmpty !== false)
+        spans.splice(i--, 1);
+    }
+    if (!spans.length) return null;
+    return spans;
+  }
+
+  // Used for un/re-doing changes from the history. Combines the
+  // result of computing the existing spans with the set of spans that
+  // existed in the history (so that deleting around a span and then
+  // undoing brings back the span).
+  function mergeOldSpans(doc, change) {
+    var old = getOldSpans(doc, change);
+    var stretched = stretchSpansOverChange(doc, change);
+    if (!old) return stretched;
+    if (!stretched) return old;
+
+    for (var i = 0; i < old.length; ++i) {
+      var oldCur = old[i], stretchCur = stretched[i];
+      if (oldCur && stretchCur) {
+        spans: for (var j = 0; j < stretchCur.length; ++j) {
+          var span = stretchCur[j];
+          for (var k = 0; k < oldCur.length; ++k)
+            if (oldCur[k].marker == span.marker) continue spans;
+          oldCur.push(span);
+        }
+      } else if (stretchCur) {
+        old[i] = stretchCur;
+      }
+    }
+    return old;
+  }
+
+  // Used to 'clip' out readOnly ranges when making a change.
+  function removeReadOnlyRanges(doc, from, to) {
+    var markers = null;
+    doc.iter(from.line, to.line + 1, function(line) {
+      if (line.markedSpans) for (var i = 0; i < line.markedSpans.length; ++i) {
+        var mark = line.markedSpans[i].marker;
+        if (mark.readOnly && (!markers || indexOf(markers, mark) == -1))
+          (markers || (markers = [])).push(mark);
+      }
+    });
+    if (!markers) return null;
+    var parts = [{from: from, to: to}];
+    for (var i = 0; i < markers.length; ++i) {
+      var mk = markers[i], m = mk.find(0);
+      for (var j = 0; j < parts.length; ++j) {
+        var p = parts[j];
+        if (cmp(p.to, m.from) < 0 || cmp(p.from, m.to) > 0) continue;
+        var newParts = [j, 1], dfrom = cmp(p.from, m.from), dto = cmp(p.to, m.to);
+        if (dfrom < 0 || !mk.inclusiveLeft && !dfrom)
+          newParts.push({from: p.from, to: m.from});
+        if (dto > 0 || !mk.inclusiveRight && !dto)
+          newParts.push({from: m.to, to: p.to});
+        parts.splice.apply(parts, newParts);
+        j += newParts.length - 1;
+      }
+    }
+    return parts;
+  }
+
+  // Connect or disconnect spans from a line.
+  function detachMarkedSpans(line) {
+    var spans = line.markedSpans;
+    if (!spans) return;
+    for (var i = 0; i < spans.length; ++i)
+      spans[i].marker.detachLine(line);
+    line.markedSpans = null;
+  }
+  function attachMarkedSpans(line, spans) {
+    if (!spans) return;
+    for (var i = 0; i < spans.length; ++i)
+      spans[i].marker.attachLine(line);
+    line.markedSpans = spans;
+  }
+
+  // Helpers used when computing which overlapping collapsed span
+  // counts as the larger one.
+  function extraLeft(marker) { return marker.inclusiveLeft ? -1 : 0; }
+  function extraRight(marker) { return marker.inclusiveRight ? 1 : 0; }
+
+  // Returns a number indicating which of two overlapping collapsed
+  // spans is larger (and thus includes the other). Falls back to
+  // comparing ids when the spans cover exactly the same range.
+  function compareCollapsedMarkers(a, b) {
+    var lenDiff = a.lines.length - b.lines.length;
+    if (lenDiff != 0) return lenDiff;
+    var aPos = a.find(), bPos = b.find();
+    var fromCmp = cmp(aPos.from, bPos.from) || extraLeft(a) - extraLeft(b);
+    if (fromCmp) return -fromCmp;
+    var toCmp = cmp(aPos.to, bPos.to) || extraRight(a) - extraRight(b);
+    if (toCmp) return toCmp;
+    return b.id - a.id;
+  }
+
+  // Find out whether a line ends or starts in a collapsed span. If
+  // so, return the marker for that span.
+  function collapsedSpanAtSide(line, start) {
+    var sps = sawCollapsedSpans && line.markedSpans, found;
+    if (sps) for (var sp, i = 0; i < sps.length; ++i) {
+      sp = sps[i];
+      if (sp.marker.collapsed && (start ? sp.from : sp.to) == null &&
+          (!found || compareCollapsedMarkers(found, sp.marker) < 0))
+        found = sp.marker;
+    }
+    return found;
+  }
+  function collapsedSpanAtStart(line) { return collapsedSpanAtSide(line, true); }
+  function collapsedSpanAtEnd(line) { return collapsedSpanAtSide(line, false); }
+
+  // Test whether there exists a collapsed span that partially
+  // overlaps (covers the start or end, but not both) of a new span.
+  // Such overlap is not allowed.
+  function conflictingCollapsedRange(doc, lineNo, from, to, marker) {
+    var line = getLine(doc, lineNo);
+    var sps = sawCollapsedSpans && line.markedSpans;
+    if (sps) for (var i = 0; i < sps.length; ++i) {
+      var sp = sps[i];
+      if (!sp.marker.collapsed) continue;
+      var found = sp.marker.find(0);
+      var fromCmp = cmp(found.from, from) || extraLeft(sp.marker) - extraLeft(marker);
+      var toCmp = cmp(found.to, to) || extraRight(sp.marker) - extraRight(marker);
+      if (fromCmp >= 0 && toCmp <= 0 || fromCmp <= 0 && toCmp >= 0) continue;
+      if (fromCmp <= 0 && (cmp(found.to, from) > 0 || (sp.marker.inclusiveRight && marker.inclusiveLeft)) ||
+          fromCmp >= 0 && (cmp(found.from, to) < 0 || (sp.marker.inclusiveLeft && marker.inclusiveRight)))
+        return true;
+    }
+  }
+
+  // A visual line is a line as drawn on the screen. Folding, for
+  // example, can cause multiple logical lines to appear on the same
+  // visual line. This finds the start of the visual line that the
+  // given line is part of (usually that is the line itself).
+  function visualLine(line) {
+    var merged;
+    while (merged = collapsedSpanAtStart(line))
+      line = merged.find(-1, true).line;
+    return line;
+  }
+
+  // Returns an array of logical lines that continue the visual line
+  // started by the argument, or undefined if there are no such lines.
+  function visualLineContinued(line) {
+    var merged, lines;
+    while (merged = collapsedSpanAtEnd(line)) {
+      line = merged.find(1, true).line;
+      (lines || (lines = [])).push(line);
+    }
+    return lines;
+  }
+
+  // Get the line number of the start of the visual line that the
+  // given line number is part of.
+  function visualLineNo(doc, lineN) {
+    var line = getLine(doc, lineN), vis = visualLine(line);
+    if (line == vis) return lineN;
+    return lineNo(vis);
+  }
+  // Get the line number of the start of the next visual line after
+  // the given line.
+  function visualLineEndNo(doc, lineN) {
+    if (lineN > doc.lastLine()) return lineN;
+    var line = getLine(doc, lineN), merged;
+    if (!lineIsHidden(doc, line)) return lineN;
+    while (merged = collapsedSpanAtEnd(line))
+      line = merged.find(1, true).line;
+    return lineNo(line) + 1;
+  }
+
+  // Compute whether a line is hidden. Lines count as hidden when they
+  // are part of a visual line that starts with another line, or when
+  // they are entirely covered by collapsed, non-widget span.
+  function lineIsHidden(doc, line) {
+    var sps = sawCollapsedSpans && line.markedSpans;
+    if (sps) for (var sp, i = 0; i < sps.length; ++i) {
+      sp = sps[i];
+      if (!sp.marker.collapsed) continue;
+      if (sp.from == null) return true;
+      if (sp.marker.widgetNode) continue;
+      if (sp.from == 0 && sp.marker.inclusiveLeft && lineIsHiddenInner(doc, line, sp))
+        return true;
+    }
+  }
+  function lineIsHiddenInner(doc, line, span) {
+    if (span.to == null) {
+      var end = span.marker.find(1, true);
+      return lineIsHiddenInner(doc, end.line, getMarkedSpanFor(end.line.markedSpans, span.marker));
+    }
+    if (span.marker.inclusiveRight && span.to == line.text.length)
+      return true;
+    for (var sp, i = 0; i < line.markedSpans.length; ++i) {
+      sp = line.markedSpans[i];
+      if (sp.marker.collapsed && !sp.marker.widgetNode && sp.from == span.to &&
+          (sp.to == null || sp.to != span.from) &&
+          (sp.marker.inclusiveLeft || span.marker.inclusiveRight) &&
+          lineIsHiddenInner(doc, line, sp)) return true;
+    }
+  }
+
+  // LINE WIDGETS
+
+  // Line widgets are block elements displayed above or below a line.
+
+  var LineWidget = CodeMirror.LineWidget = function(doc, node, options) {
+    if (options) for (var opt in options) if (options.hasOwnProperty(opt))
+      this[opt] = options[opt];
+    this.doc = doc;
+    this.node = node;
+  };
+  eventMixin(LineWidget);
+
+  function adjustScrollWhenAboveVisible(cm, line, diff) {
+    if (heightAtLine(line) < ((cm.curOp && cm.curOp.scrollTop) || cm.doc.scrollTop))
+      addToScrollPos(cm, null, diff);
+  }
+
+  LineWidget.prototype.clear = function() {
+    var cm = this.doc.cm, ws = this.line.widgets, line = this.line, no = lineNo(line);
+    if (no == null || !ws) return;
+    for (var i = 0; i < ws.length; ++i) if (ws[i] == this) ws.splice(i--, 1);
+    if (!ws.length) line.widgets = null;
+    var height = widgetHeight(this);
+    updateLineHeight(line, Math.max(0, line.height - height));
+    if (cm) runInOp(cm, function() {
+      adjustScrollWhenAboveVisible(cm, line, -height);
+      regLineChange(cm, no, "widget");
+    });
+  };
+  LineWidget.prototype.changed = function() {
+    var oldH = this.height, cm = this.doc.cm, line = this.line;
+    this.height = null;
+    var diff = widgetHeight(this) - oldH;
+    if (!diff) return;
+    updateLineHeight(line, line.height + diff);
+    if (cm) runInOp(cm, function() {
+      cm.curOp.forceUpdate = true;
+      adjustScrollWhenAboveVisible(cm, line, diff);
+    });
+  };
+
+  function widgetHeight(widget) {
+    if (widget.height != null) return widget.height;
+    var cm = widget.doc.cm;
+    if (!cm) return 0;
+    if (!contains(document.body, widget.node)) {
+      var parentStyle = "position: relative;";
+      if (widget.coverGutter)
+        parentStyle += "margin-left: -" + cm.display.gutters.offsetWidth + "px;";
+      if (widget.noHScroll)
+        parentStyle += "width: " + cm.display.wrapper.clientWidth + "px;";
+      removeChildrenAndAdd(cm.display.measure, elt("div", [widget.node], null, parentStyle));
+    }
+    return widget.height = widget.node.offsetHeight;
+  }
+
+  function addLineWidget(doc, handle, node, options) {
+    var widget = new LineWidget(doc, node, options);
+    var cm = doc.cm;
+    if (cm && widget.noHScroll) cm.display.alignWidgets = true;
+    changeLine(doc, handle, "widget", function(line) {
+      var widgets = line.widgets || (line.widgets = []);
+      if (widget.insertAt == null) widgets.push(widget);
+      else widgets.splice(Math.min(widgets.length - 1, Math.max(0, widget.insertAt)), 0, widget);
+      widget.line = line;
+      if (cm && !lineIsHidden(doc, line)) {
+        var aboveVisible = heightAtLine(line) < doc.scrollTop;
+        updateLineHeight(line, line.height + widgetHeight(widget));
+        if (aboveVisible) addToScrollPos(cm, null, widget.height);
+        cm.curOp.forceUpdate = true;
+      }
+      return true;
+    });
+    return widget;
+  }
+
+  // LINE DATA STRUCTURE
+
+  // Line objects. These hold state related to a line, including
+  // highlighting info (the styles array).
+  var Line = CodeMirror.Line = function(text, markedSpans, estimateHeight) {
+    this.text = text;
+    attachMarkedSpans(this, markedSpans);
+    this.height = estimateHeight ? estimateHeight(this) : 1;
+  };
+  eventMixin(Line);
+  Line.prototype.lineNo = function() { return lineNo(this); };
+
+  // Change the content (text, markers) of a line. Automatically
+  // invalidates cached information and tries to re-estimate the
+  // line's height.
+  function updateLine(line, text, markedSpans, estimateHeight) {
+    line.text = text;
+    if (line.stateAfter) line.stateAfter = null;
+    if (line.styles) line.styles = null;
+    if (line.order != null) line.order = null;
+    detachMarkedSpans(line);
+    attachMarkedSpans(line, markedSpans);
+    var estHeight = estimateHeight ? estimateHeight(line) : 1;
+    if (estHeight != line.height) updateLineHeight(line, estHeight);
+  }
+
+  // Detach a line from the document tree and its markers.
+  function cleanUpLine(line) {
+    line.parent = null;
+    detachMarkedSpans(line);
+  }
+
+  function extractLineClasses(type, output) {
+    if (type) for (;;) {
+      var lineClass = type.match(/(?:^|\s+)line-(background-)?(\S+)/);
+      if (!lineClass) break;
+      type = type.slice(0, lineClass.index) + type.slice(lineClass.index + lineClass[0].length);
+      var prop = lineClass[1] ? "bgClass" : "textClass";
+      if (output[prop] == null)
+        output[prop] = lineClass[2];
+      else if (!(new RegExp("(?:^|\s)" + lineClass[2] + "(?:$|\s)")).test(output[prop]))
+        output[prop] += " " + lineClass[2];
+    }
+    return type;
+  }
+
+  function callBlankLine(mode, state) {
+    if (mode.blankLine) return mode.blankLine(state);
+    if (!mode.innerMode) return;
+    var inner = CodeMirror.innerMode(mode, state);
+    if (inner.mode.blankLine) return inner.mode.blankLine(inner.state);
+  }
+
+  function readToken(mode, stream, state, inner) {
+    for (var i = 0; i < 10; i++) {
+      if (inner) inner[0] = CodeMirror.innerMode(mode, state).mode;
+      var style = mode.token(stream, state);
+      if (stream.pos > stream.start) return style;
+    }
+    throw new Error("Mode " + mode.name + " failed to advance stream.");
+  }
+
+  // Utility for getTokenAt and getLineTokens
+  function takeToken(cm, pos, precise, asArray) {
+    function getObj(copy) {
+      return {start: stream.start, end: stream.pos,
+              string: stream.current(),
+              type: style || null,
+              state: copy ? copyState(doc.mode, state) : state};
+    }
+
+    var doc = cm.doc, mode = doc.mode, style;
+    pos = clipPos(doc, pos);
+    var line = getLine(doc, pos.line), state = getStateBefore(cm, pos.line, precise);
+    var stream = new StringStream(line.text, cm.options.tabSize), tokens;
+    if (asArray) tokens = [];
+    while ((asArray || stream.pos < pos.ch) && !stream.eol()) {
+      stream.start = stream.pos;
+      style = readToken(mode, stream, state);
+      if (asArray) tokens.push(getObj(true));
+    }
+    return asArray ? tokens : getObj();
+  }
+
+  // Run the given mode's parser over a line, calling f for each token.
+  function runMode(cm, text, mode, state, f, lineClasses, forceToEnd) {
+    var flattenSpans = mode.flattenSpans;
+    if (flattenSpans == null) flattenSpans = cm.options.flattenSpans;
+    var curStart = 0, curStyle = null;
+    var stream = new StringStream(text, cm.options.tabSize), style;
+    var inner = cm.options.addModeClass && [null];
+    if (text == "") extractLineClasses(callBlankLine(mode, state), lineClasses);
+    while (!stream.eol()) {
+      if (stream.pos > cm.options.maxHighlightLength) {
+        flattenSpans = false;
+        if (forceToEnd) processLine(cm, text, state, stream.pos);
+        stream.pos = text.length;
+        style = null;
+      } else {
+        style = extractLineClasses(readToken(mode, stream, state, inner), lineClasses);
+      }
+      if (inner) {
+        var mName = inner[0].name;
+        if (mName) style = "m-" + (style ? mName + " " + style : mName);
+      }
+      if (!flattenSpans || curStyle != style) {
+        while (curStart < stream.start) {
+          curStart = Math.min(stream.start, curStart + 50000);
+          f(curStart, curStyle);
+        }
+        curStyle = style;
+      }
+      stream.start = stream.pos;
+    }
+    while (curStart < stream.pos) {
+      // Webkit seems to refuse to render text nodes longer than 57444 characters
+      var pos = Math.min(stream.pos, curStart + 50000);
+      f(pos, curStyle);
+      curStart = pos;
+    }
+  }
+
+  // Compute a style array (an array starting with a mode generation
+  // -- for invalidation -- followed by pairs of end positions and
+  // style strings), which is used to highlight the tokens on the
+  // line.
+  function highlightLine(cm, line, state, forceToEnd) {
+    // A styles array always starts with a number identifying the
+    // mode/overlays that it is based on (for easy invalidation).
+    var st = [cm.state.modeGen], lineClasses = {};
+    // Compute the base array of styles
+    runMode(cm, line.text, cm.doc.mode, state, function(end, style) {
+      st.push(end, style);
+    }, lineClasses, forceToEnd);
+
+    // Run overlays, adjust style array.
+    for (var o = 0; o < cm.state.overlays.length; ++o) {
+      var overlay = cm.state.overlays[o], i = 1, at = 0;
+      runMode(cm, line.text, overlay.mode, true, function(end, style) {
+        var start = i;
+        // Ensure there's a token end at the current position, and that i points at it
+        while (at < end) {
+          var i_end = st[i];
+          if (i_end > end)
+            st.splice(i, 1, end, st[i+1], i_end);
+          i += 2;
+          at = Math.min(end, i_end);
+        }
+        if (!style) return;
+        if (overlay.opaque) {
+          st.splice(start, i - start, end, "cm-overlay " + style);
+          i = start + 2;
+        } else {
+          for (; start < i; start += 2) {
+            var cur = st[start+1];
+            st[start+1] = (cur ? cur + " " : "") + "cm-overlay " + style;
+          }
+        }
+      }, lineClasses);
+    }
+
+    return {styles: st, classes: lineClasses.bgClass || lineClasses.textClass ? lineClasses : null};
+  }
+
+  function getLineStyles(cm, line, updateFrontier) {
+    if (!line.styles || line.styles[0] != cm.state.modeGen) {
+      var state = getStateBefore(cm, lineNo(line));
+      var result = highlightLine(cm, line, line.text.length > cm.options.maxHighlightLength ? copyState(cm.doc.mode, state) : state);
+      line.stateAfter = state;
+      line.styles = result.styles;
+      if (result.classes) line.styleClasses = result.classes;
+      else if (line.styleClasses) line.styleClasses = null;
+      if (updateFrontier === cm.doc.frontier) cm.doc.frontier++;
+    }
+    return line.styles;
+  }
+
+  // Lightweight form of highlight -- proceed over this line and
+  // update state, but don't save a style array. Used for lines that
+  // aren't currently visible.
+  function processLine(cm, text, state, startAt) {
+    var mode = cm.doc.mode;
+    var stream = new StringStream(text, cm.options.tabSize);
+    stream.start = stream.pos = startAt || 0;
+    if (text == "") callBlankLine(mode, state);
+    while (!stream.eol()) {
+      readToken(mode, stream, state);
+      stream.start = stream.pos;
+    }
+  }
+
+  // Convert a style as returned by a mode (either null, or a string
+  // containing one or more styles) to a CSS style. This is cached,
+  // and also looks for line-wide styles.
+  var styleToClassCache = {}, styleToClassCacheWithMode = {};
+  function interpretTokenStyle(style, options) {
+    if (!style || /^\s*$/.test(style)) return null;
+    var cache = options.addModeClass ? styleToClassCacheWithMode : styleToClassCache;
+    return cache[style] ||
+      (cache[style] = style.replace(/\S+/g, "cm-$&"));
+  }
+
+  // Render the DOM representation of the text of a line. Also builds
+  // up a 'line map', which points at the DOM nodes that represent
+  // specific stretches of text, and is used by the measuring code.
+  // The returned object contains the DOM node, this map, and
+  // information about line-wide styles that were set by the mode.
+  function buildLineContent(cm, lineView) {
+    // The padding-right forces the element to have a 'border', which
+    // is needed on Webkit to be able to get line-level bounding
+    // rectangles for it (in measureChar).
+    var content = elt("span", null, null, webkit ? "padding-right: .1px" : null);
+    var builder = {pre: elt("pre", [content], "CodeMirror-line"), content: content,
+                   col: 0, pos: 0, cm: cm,
+                   splitSpaces: (ie || webkit) && cm.getOption("lineWrapping")};
+    lineView.measure = {};
+
+    // Iterate over the logical lines that make up this visual line.
+    for (var i = 0; i <= (lineView.rest ? lineView.rest.length : 0); i++) {
+      var line = i ? lineView.rest[i - 1] : lineView.line, order;
+      builder.pos = 0;
+      builder.addToken = buildToken;
+      // Optionally wire in some hacks into the token-rendering
+      // algorithm, to deal with browser quirks.
+      if (hasBadBidiRects(cm.display.measure) && (order = getOrder(line)))
+        builder.addToken = buildTokenBadBidi(builder.addToken, order);
+      builder.map = [];
+      var allowFrontierUpdate = lineView != cm.display.externalMeasured && lineNo(line);
+      insertLineContent(line, builder, getLineStyles(cm, line, allowFrontierUpdate));
+      if (line.styleClasses) {
+        if (line.styleClasses.bgClass)
+          builder.bgClass = joinClasses(line.styleClasses.bgClass, builder.bgClass || "");
+        if (line.styleClasses.textClass)
+          builder.textClass = joinClasses(line.styleClasses.textClass, builder.textClass || "");
+      }
+
+      // Ensure at least a single node is present, for measuring.
+      if (builder.map.length == 0)
+        builder.map.push(0, 0, builder.content.appendChild(zeroWidthElement(cm.display.measure)));
+
+      // Store the map and a cache object for the current logical line
+      if (i == 0) {
+        lineView.measure.map = builder.map;
+        lineView.measure.cache = {};
+      } else {
+        (lineView.measure.maps || (lineView.measure.maps = [])).push(builder.map);
+        (lineView.measure.caches || (lineView.measure.caches = [])).push({});
+      }
+    }
+
+    // See issue #2901
+    if (webkit && /\bcm-tab\b/.test(builder.content.lastChild.className))
+      builder.content.className = "cm-tab-wrap-hack";
+
+    signal(cm, "renderLine", cm, lineView.line, builder.pre);
+    if (builder.pre.className)
+      builder.textClass = joinClasses(builder.pre.className, builder.textClass || "");
+
+    return builder;
+  }
+
+  function defaultSpecialCharPlaceholder(ch) {
+    var token = elt("span", "\u2022", "cm-invalidchar");
+    token.title = "\\u" + ch.charCodeAt(0).toString(16);
+    token.setAttribute("aria-label", token.title);
+    return token;
+  }
+
+  // Build up the DOM representation for a single token, and add it to
+  // the line map. Takes care to render special characters separately.
+  function buildToken(builder, text, style, startStyle, endStyle, title, css) {
+    if (!text) return;
+    var displayText = builder.splitSpaces ? text.replace(/ {3,}/g, splitSpaces) : text;
+    var special = builder.cm.state.specialChars, mustWrap = false;
+    if (!special.test(text)) {
+      builder.col += text.length;
+      var content = document.createTextNode(displayText);
+      builder.map.push(builder.pos, builder.pos + text.length, content);
+      if (ie && ie_version < 9) mustWrap = true;
+      builder.pos += text.length;
+    } else {
+      var content = document.createDocumentFragment(), pos = 0;
+      while (true) {
+        special.lastIndex = pos;
+        var m = special.exec(text);
+        var skipped = m ? m.index - pos : text.length - pos;
+        if (skipped) {
+          var txt = document.createTextNode(displayText.slice(pos, pos + skipped));
+          if (ie && ie_version < 9) content.appendChild(elt("span", [txt]));
+          else content.appendChild(txt);
+          builder.map.push(builder.pos, builder.pos + skipped, txt);
+          builder.col += skipped;
+          builder.pos += skipped;
+        }
+        if (!m) break;
+        pos += skipped + 1;
+        if (m[0] == "\t") {
+          var tabSize = builder.cm.options.tabSize, tabWidth = tabSize - builder.col % tabSize;
+          var txt = content.appendChild(elt("span", spaceStr(tabWidth), "cm-tab"));
+          txt.setAttribute("role", "presentation");
+          txt.setAttribute("cm-text", "\t");
+          builder.col += tabWidth;
+        } else if (m[0] == "\r" || m[0] == "\n") {
+          var txt = content.appendChild(elt("span", m[0] == "\r" ? "␍" : "␤", "cm-invalidchar"));
+          txt.setAttribute("cm-text", m[0]);
+          builder.col += 1;
+        } else {
+          var txt = builder.cm.options.specialCharPlaceholder(m[0]);
+          txt.setAttribute("cm-text", m[0]);
+          if (ie && ie_version < 9) content.appendChild(elt("span", [txt]));
+          else content.appendChild(txt);
+          builder.col += 1;
+        }
+        builder.map.push(builder.pos, builder.pos + 1, txt);
+        builder.pos++;
+      }
+    }
+    if (style || startStyle || endStyle || mustWrap || css) {
+      var fullStyle = style || "";
+      if (startStyle) fullStyle += startStyle;
+      if (endStyle) fullStyle += endStyle;
+      var token = elt("span", [content], fullStyle, css);
+      if (title) token.title = title;
+      return builder.content.appendChild(token);
+    }
+    builder.content.appendChild(content);
+  }
+
+  function splitSpaces(old) {
+    var out = " ";
+    for (var i = 0; i < old.length - 2; ++i) out += i % 2 ? " " : "\u00a0";
+    out += " ";
+    return out;
+  }
+
+  // Work around nonsense dimensions being reported for stretches of
+  // right-to-left text.
+  function buildTokenBadBidi(inner, order) {
+    return function(builder, text, style, startStyle, endStyle, title, css) {
+      style = style ? style + " cm-force-border" : "cm-force-border";
+      var start = builder.pos, end = start + text.length;
+      for (;;) {
+        // Find the part that overlaps with the start of this text
+        for (var i = 0; i < order.length; i++) {
+          var part = order[i];
+          if (part.to > start && part.from <= start) break;
+        }
+        if (part.to >= end) return inner(builder, text, style, startStyle, endStyle, title, css);
+        inner(builder, text.slice(0, part.to - start), style, startStyle, null, title, css);
+        startStyle = null;
+        text = text.slice(part.to - start);
+        start = part.to;
+      }
+    };
+  }
+
+  function buildCollapsedSpan(builder, size, marker, ignoreWidget) {
+    var widget = !ignoreWidget && marker.widgetNode;
+    if (widget) builder.map.push(builder.pos, builder.pos + size, widget);
+    if (!ignoreWidget && builder.cm.display.input.needsContentAttribute) {
+      if (!widget)
+        widget = builder.content.appendChild(document.createElement("span"));
+      widget.setAttribute("cm-marker", marker.id);
+    }
+    if (widget) {
+      builder.cm.display.input.setUneditable(widget);
+      builder.content.appendChild(widget);
+    }
+    builder.pos += size;
+  }
+
+  // Outputs a number of spans to make up a line, taking highlighting
+  // and marked text into account.
+  function insertLineContent(line, builder, styles) {
+    var spans = line.markedSpans, allText = line.text, at = 0;
+    if (!spans) {
+      for (var i = 1; i < styles.length; i+=2)
+        builder.addToken(builder, allText.slice(at, at = styles[i]), interpretTokenStyle(styles[i+1], builder.cm.options));
+      return;
+    }
+
+    var len = allText.length, pos = 0, i = 1, text = "", style, css;
+    var nextChange = 0, spanStyle, spanEndStyle, spanStartStyle, title, collapsed;
+    for (;;) {
+      if (nextChange == pos) { // Update current marker set
+        spanStyle = spanEndStyle = spanStartStyle = title = css = "";
+        collapsed = null; nextChange = Infinity;
+        var foundBookmarks = [];
+        for (var j = 0; j < spans.length; ++j) {
+          var sp = spans[j], m = sp.marker;
+          if (m.type == "bookmark" && sp.from == pos && m.widgetNode) {
+            foundBookmarks.push(m);
+          } else if (sp.from <= pos && (sp.to == null || sp.to > pos || m.collapsed && sp.to == pos && sp.from == pos)) {
+            if (sp.to != null && sp.to != pos && nextChange > sp.to) {
+              nextChange = sp.to;
+              spanEndStyle = "";
+            }
+            if (m.className) spanStyle += " " + m.className;
+            if (m.css) css = m.css;
+            if (m.startStyle && sp.from == pos) spanStartStyle += " " + m.startStyle;
+            if (m.endStyle && sp.to == nextChange) spanEndStyle += " " + m.endStyle;
+            if (m.title && !title) title = m.title;
+            if (m.collapsed && (!collapsed || compareCollapsedMarkers(collapsed.marker, m) < 0))
+              collapsed = sp;
+          } else if (sp.from > pos && nextChange > sp.from) {
+            nextChange = sp.from;
+          }
+        }
+        if (collapsed && (collapsed.from || 0) == pos) {
+          buildCollapsedSpan(builder, (collapsed.to == null ? len + 1 : collapsed.to) - pos,
+                             collapsed.marker, collapsed.from == null);
+          if (collapsed.to == null) return;
+          if (collapsed.to == pos) collapsed = false;
+        }
+        if (!collapsed && foundBookmarks.length) for (var j = 0; j < foundBookmarks.length; ++j)
+          buildCollapsedSpan(builder, 0, foundBookmarks[j]);
+      }
+      if (pos >= len) break;
+
+      var upto = Math.min(len, nextChange);
+      while (true) {
+        if (text) {
+          var end = pos + text.length;
+          if (!collapsed) {
+            var tokenText = end > upto ? text.slice(0, upto - pos) : text;
+            builder.addToken(builder, tokenText, style ? style + spanStyle : spanStyle,
+                             spanStartStyle, pos + tokenText.length == nextChange ? spanEndStyle : "", title, css);
+          }
+          if (end >= upto) {text = text.slice(upto - pos); pos = upto; break;}
+          pos = end;
+          spanStartStyle = "";
+        }
+        text = allText.slice(at, at = styles[i++]);
+        style = interpretTokenStyle(styles[i++], builder.cm.options);
+      }
+    }
+  }
+
+  // DOCUMENT DATA STRUCTURE
+
+  // By default, updates that start and end at the beginning of a line
+  // are treated specially, in order to make the association of line
+  // widgets and marker elements with the text behave more intuitive.
+  function isWholeLineUpdate(doc, change) {
+    return change.from.ch == 0 && change.to.ch == 0 && lst(change.text) == "" &&
+      (!doc.cm || doc.cm.options.wholeLineUpdateBefore);
+  }
+
+  // Perform a change on the document data structure.
+  function updateDoc(doc, change, markedSpans, estimateHeight) {
+    function spansFor(n) {return markedSpans ? markedSpans[n] : null;}
+    function update(line, text, spans) {
+      updateLine(line, text, spans, estimateHeight);
+      signalLater(line, "change", line, change);
+    }
+    function linesFor(start, end) {
+      for (var i = start, result = []; i < end; ++i)
+        result.push(new Line(text[i], spansFor(i), estimateHeight));
+      return result;
+    }
+
+    var from = change.from, to = change.to, text = change.text;
+    var firstLine = getLine(doc, from.line), lastLine = getLine(doc, to.line);
+    var lastText = lst(text), lastSpans = spansFor(text.length - 1), nlines = to.line - from.line;
+
+    // Adjust the line structure
+    if (change.full) {
+      doc.insert(0, linesFor(0, text.length));
+      doc.remove(text.length, doc.size - text.length);
+    } else if (isWholeLineUpdate(doc, change)) {
+      // This is a whole-line replace. Treated specially to make
+      // sure line objects move the way they are supposed to.
+      var added = linesFor(0, text.length - 1);
+      update(lastLine, lastLine.text, lastSpans);
+      if (nlines) doc.remove(from.line, nlines);
+      if (added.length) doc.insert(from.line, added);
+    } else if (firstLine == lastLine) {
+      if (text.length == 1) {
+        update(firstLine, firstLine.text.slice(0, from.ch) + lastText + firstLine.text.slice(to.ch), lastSpans);
+      } else {
+        var added = linesFor(1, text.length - 1);
+        added.push(new Line(lastText + firstLine.text.slice(to.ch), lastSpans, estimateHeight));
+        update(firstLine, firstLine.text.slice(0, from.ch) + text[0], spansFor(0));
+        doc.insert(from.line + 1, added);
+      }
+    } else if (text.length == 1) {
+      update(firstLine, firstLine.text.slice(0, from.ch) + text[0] + lastLine.text.slice(to.ch), spansFor(0));
+      doc.remove(from.line + 1, nlines);
+    } else {
+      update(firstLine, firstLine.text.slice(0, from.ch) + text[0], spansFor(0));
+      update(lastLine, lastText + lastLine.text.slice(to.ch), lastSpans);
+      var added = linesFor(1, text.length - 1);
+      if (nlines > 1) doc.remove(from.line + 1, nlines - 1);
+      doc.insert(from.line + 1, added);
+    }
+
+    signalLater(doc, "change", doc, change);
+  }
+
+  // The document is represented as a BTree consisting of leaves, with
+  // chunk of lines in them, and branches, with up to ten leaves or
+  // other branch nodes below them. The top node is always a branch
+  // node, and is the document object itself (meaning it has
+  // additional methods and properties).
+  //
+  // All nodes have parent links. The tree is used both to go from
+  // line numbers to line objects, and to go from objects to numbers.
+  // It also indexes by height, and is used to convert between height
+  // and line object, and to find the total height of the document.
+  //
+  // See also http://marijnhaverbeke.nl/blog/codemirror-line-tree.html
+
+  function LeafChunk(lines) {
+    this.lines = lines;
+    this.parent = null;
+    for (var i = 0, height = 0; i < lines.length; ++i) {
+      lines[i].parent = this;
+      height += lines[i].height;
+    }
+    this.height = height;
+  }
+
+  LeafChunk.prototype = {
+    chunkSize: function() { return this.lines.length; },
+    // Remove the n lines at offset 'at'.
+    removeInner: function(at, n) {
+      for (var i = at, e = at + n; i < e; ++i) {
+        var line = this.lines[i];
+        this.height -= line.height;
+        cleanUpLine(line);
+        signalLater(line, "delete");
+      }
+      this.lines.splice(at, n);
+    },
+    // Helper used to collapse a small branch into a single leaf.
+    collapse: function(lines) {
+      lines.push.apply(lines, this.lines);
+    },
+    // Insert the given array of lines at offset 'at', count them as
+    // having the given height.
+    insertInner: function(at, lines, height) {
+      this.height += height;
+      this.lines = this.lines.slice(0, at).concat(lines).concat(this.lines.slice(at));
+      for (var i = 0; i < lines.length; ++i) lines[i].parent = this;
+    },
+    // Used to iterate over a part of the tree.
+    iterN: function(at, n, op) {
+      for (var e = at + n; at < e; ++at)
+        if (op(this.lines[at])) return true;
+    }
+  };
+
+  function BranchChunk(children) {
+    this.children = children;
+    var size = 0, height = 0;
+    for (var i = 0; i < children.length; ++i) {
+      var ch = children[i];
+      size += ch.chunkSize(); height += ch.height;
+      ch.parent = this;
+    }
+    this.size = size;
+    this.height = height;
+    this.parent = null;
+  }
+
+  BranchChunk.prototype = {
+    chunkSize: function() { return this.size; },
+    removeInner: function(at, n) {
+      this.size -= n;
+      for (var i = 0; i < this.children.length; ++i) {
+        var child = this.children[i], sz = child.chunkSize();
+        if (at < sz) {
+          var rm = Math.min(n, sz - at), oldHeight = child.height;
+          child.removeInner(at, rm);
+          this.height -= oldHeight - child.height;
+          if (sz == rm) { this.children.splice(i--, 1); child.parent = null; }
+          if ((n -= rm) == 0) break;
+          at = 0;
+        } else at -= sz;
+      }
+      // If the result is smaller than 25 lines, ensure that it is a
+      // single leaf node.
+      if (this.size - n < 25 &&
+          (this.children.length > 1 || !(this.children[0] instanceof LeafChunk))) {
+        var lines = [];
+        this.collapse(lines);
+        this.children = [new LeafChunk(lines)];
+        this.children[0].parent = this;
+      }
+    },
+    collapse: function(lines) {
+      for (var i = 0; i < this.children.length; ++i) this.children[i].collapse(lines);
+    },
+    insertInner: function(at, lines, height) {
+      this.size += lines.length;
+      this.height += height;
+      for (var i = 0; i < this.children.length; ++i) {
+        var child = this.children[i], sz = child.chunkSize();
+        if (at <= sz) {
+          child.insertInner(at, lines, height);
+          if (child.lines && child.lines.length > 50) {
+            while (child.lines.length > 50) {
+              var spilled = child.lines.splice(child.lines.length - 25, 25);
+              var newleaf = new LeafChunk(spilled);
+              child.height -= newleaf.height;
+              this.children.splice(i + 1, 0, newleaf);
+              newleaf.parent = this;
+            }
+            this.maybeSpill();
+          }
+          break;
+        }
+        at -= sz;
+      }
+    },
+    // When a node has grown, check whether it should be split.
+    maybeSpill: function() {
+      if (this.children.length <= 10) return;
+      var me = this;
+      do {
+        var spilled = me.children.splice(me.children.length - 5, 5);
+        var sibling = new BranchChunk(spilled);
+        if (!me.parent) { // Become the parent node
+          var copy = new BranchChunk(me.children);
+          copy.parent = me;
+          me.children = [copy, sibling];
+          me = copy;
+        } else {
+          me.size -= sibling.size;
+          me.height -= sibling.height;
+          var myIndex = indexOf(me.parent.children, me);
+          me.parent.children.splice(myIndex + 1, 0, sibling);
+        }
+        sibling.parent = me.parent;
+      } while (me.children.length > 10);
+      me.parent.maybeSpill();
+    },
+    iterN: function(at, n, op) {
+      for (var i = 0; i < this.children.length; ++i) {
+        var child = this.children[i], sz = child.chunkSize();
+        if (at < sz) {
+          var used = Math.min(n, sz - at);
+          if (child.iterN(at, used, op)) return true;
+          if ((n -= used) == 0) break;
+          at = 0;
+        } else at -= sz;
+      }
+    }
+  };
+
+  var nextDocId = 0;
+  var Doc = CodeMirror.Doc = function(text, mode, firstLine, lineSep) {
+    if (!(this instanceof Doc)) return new Doc(text, mode, firstLine, lineSep);
+    if (firstLine == null) firstLine = 0;
+
+    BranchChunk.call(this, [new LeafChunk([new Line("", null)])]);
+    this.first = firstLine;
+    this.scrollTop = this.scrollLeft = 0;
+    this.cantEdit = false;
+    this.cleanGeneration = 1;
+    this.frontier = firstLine;
+    var start = Pos(firstLine, 0);
+    this.sel = simpleSelection(start);
+    this.history = new History(null);
+    this.id = ++nextDocId;
+    this.modeOption = mode;
+    this.lineSep = lineSep;
+
+    if (typeof text == "string") text = this.splitLines(text);
+    updateDoc(this, {from: start, to: start, text: text});
+    setSelection(this, simpleSelection(start), sel_dontScroll);
+  };
+
+  Doc.prototype = createObj(BranchChunk.prototype, {
+    constructor: Doc,
+    // Iterate over the document. Supports two forms -- with only one
+    // argument, it calls that for each line in the document. With
+    // three, it iterates over the range given by the first two (with
+    // the second being non-inclusive).
+    iter: function(from, to, op) {
+      if (op) this.iterN(from - this.first, to - from, op);
+      else this.iterN(this.first, this.first + this.size, from);
+    },
+
+    // Non-public interface for adding and removing lines.
+    insert: function(at, lines) {
+      var height = 0;
+      for (var i = 0; i < lines.length; ++i) height += lines[i].height;
+      this.insertInner(at - this.first, lines, height);
+    },
+    remove: function(at, n) { this.removeInner(at - this.first, n); },
+
+    // From here, the methods are part of the public interface. Most
+    // are also available from CodeMirror (editor) instances.
+
+    getValue: function(lineSep) {
+      var lines = getLines(this, this.first, this.first + this.size);
+      if (lineSep === false) return lines;
+      return lines.join(lineSep || this.lineSeparator());
+    },
+    setValue: docMethodOp(function(code) {
+      var top = Pos(this.first, 0), last = this.first + this.size - 1;
+      makeChange(this, {from: top, to: Pos(last, getLine(this, last).text.length),
+                        text: this.splitLines(code), origin: "setValue", full: true}, true);
+      setSelection(this, simpleSelection(top));
+    }),
+    replaceRange: function(code, from, to, origin) {
+      from = clipPos(this, from);
+      to = to ? clipPos(this, to) : from;
+      replaceRange(this, code, from, to, origin);
+    },
+    getRange: function(from, to, lineSep) {
+      var lines = getBetween(this, clipPos(this, from), clipPos(this, to));
+      if (lineSep === false) return lines;
+      return lines.join(lineSep || this.lineSeparator());
+    },
+
+    getLine: function(line) {var l = this.getLineHandle(line); return l && l.text;},
+
+    getLineHandle: function(line) {if (isLine(this, line)) return getLine(this, line);},
+    getLineNumber: function(line) {return lineNo(line);},
+
+    getLineHandleVisualStart: function(line) {
+      if (typeof line == "number") line = getLine(this, line);
+      return visualLine(line);
+    },
+
+    lineCount: function() {return this.size;},
+    firstLine: function() {return this.first;},
+    lastLine: function() {return this.first + this.size - 1;},
+
+    clipPos: function(pos) {return clipPos(this, pos);},
+
+    getCursor: function(start) {
+      var range = this.sel.primary(), pos;
+      if (start == null || start == "head") pos = range.head;
+      else if (start == "anchor") pos = range.anchor;
+      else if (start == "end" || start == "to" || start === false) pos = range.to();
+      else pos = range.from();
+      return pos;
+    },
+    listSelections: function() { return this.sel.ranges; },
+    somethingSelected: function() {return this.sel.somethingSelected();},
+
+    setCursor: docMethodOp(function(line, ch, options) {
+      setSimpleSelection(this, clipPos(this, typeof line == "number" ? Pos(line, ch || 0) : line), null, options);
+    }),
+    setSelection: docMethodOp(function(anchor, head, options) {
+      setSimpleSelection(this, clipPos(this, anchor), clipPos(this, head || anchor), options);
+    }),
+    extendSelection: docMethodOp(function(head, other, options) {
+      extendSelection(this, clipPos(this, head), other && clipPos(this, other), options);
+    }),
+    extendSelections: docMethodOp(function(heads, options) {
+      extendSelections(this, clipPosArray(this, heads, options));
+    }),
+    extendSelectionsBy: docMethodOp(function(f, options) {
+      extendSelections(this, map(this.sel.ranges, f), options);
+    }),
+    setSelections: docMethodOp(function(ranges, primary, options) {
+      if (!ranges.length) return;
+      for (var i = 0, out = []; i < ranges.length; i++)
+        out[i] = new Range(clipPos(this, ranges[i].anchor),
+                           clipPos(this, ranges[i].head));
+      if (primary == null) primary = Math.min(ranges.length - 1, this.sel.primIndex);
+      setSelection(this, normalizeSelection(out, primary), options);
+    }),
+    addSelection: docMethodOp(function(anchor, head, options) {
+      var ranges = this.sel.ranges.slice(0);
+      ranges.push(new Range(clipPos(this, anchor), clipPos(this, head || anchor)));
+      setSelection(this, normalizeSelection(ranges, ranges.length - 1), options);
+    }),
+
+    getSelection: function(lineSep) {
+      var ranges = this.sel.ranges, lines;
+      for (var i = 0; i < ranges.length; i++) {
+        var sel = getBetween(this, ranges[i].from(), ranges[i].to());
+        lines = lines ? lines.concat(sel) : sel;
+      }
+      if (lineSep === false) return lines;
+      else return lines.join(lineSep || this.lineSeparator());
+    },
+    getSelections: function(lineSep) {
+      var parts = [], ranges = this.sel.ranges;
+      for (var i = 0; i < ranges.length; i++) {
+        var sel = getBetween(this, ranges[i].from(), ranges[i].to());
+        if (lineSep !== false) sel = sel.join(lineSep || this.lineSeparator());
+        parts[i] = sel;
+      }
+      return parts;
+    },
+    replaceSelection: function(code, collapse, origin) {
+      var dup = [];
+      for (var i = 0; i < this.sel.ranges.length; i++)
+        dup[i] = code;
+      this.replaceSelections(dup, collapse, origin || "+input");
+    },
+    replaceSelections: docMethodOp(function(code, collapse, origin) {
+      var changes = [], sel = this.sel;
+      for (var i = 0; i < sel.ranges.length; i++) {
+        var range = sel.ranges[i];
+        changes[i] = {from: range.from(), to: range.to(), text: this.splitLines(code[i]), origin: origin};
+      }
+      var newSel = collapse && collapse != "end" && computeReplacedSel(this, changes, collapse);
+      for (var i = changes.length - 1; i >= 0; i--)
+        makeChange(this, changes[i]);
+      if (newSel) setSelectionReplaceHistory(this, newSel);
+      else if (this.cm) ensureCursorVisible(this.cm);
+    }),
+    undo: docMethodOp(function() {makeChangeFromHistory(this, "undo");}),
+    redo: docMethodOp(function() {makeChangeFromHistory(this, "redo");}),
+    undoSelection: docMethodOp(function() {makeChangeFromHistory(this, "undo", true);}),
+    redoSelection: docMethodOp(function() {makeChangeFromHistory(this, "redo", true);}),
+
+    setExtending: function(val) {this.extend = val;},
+    getExtending: function() {return this.extend;},
+
+    historySize: function() {
+      var hist = this.history, done = 0, undone = 0;
+      for (var i = 0; i < hist.done.length; i++) if (!hist.done[i].ranges) ++done;
+      for (var i = 0; i < hist.undone.length; i++) if (!hist.undone[i].ranges) ++undone;
+      return {undo: done, redo: undone};
+    },
+    clearHistory: function() {this.history = new History(this.history.maxGeneration);},
+
+    markClean: function() {
+      this.cleanGeneration = this.changeGeneration(true);
+    },
+    changeGeneration: function(forceSplit) {
+      if (forceSplit)
+        this.history.lastOp = this.history.lastSelOp = this.history.lastOrigin = null;
+      return this.history.generation;
+    },
+    isClean: function (gen) {
+      return this.history.generation == (gen || this.cleanGeneration);
+    },
+
+    getHistory: function() {
+      return {done: copyHistoryArray(this.history.done),
+              undone: copyHistoryArray(this.history.undone)};
+    },
+    setHistory: function(histData) {
+      var hist = this.history = new History(this.history.maxGeneration);
+      hist.done = copyHistoryArray(histData.done.slice(0), null, true);
+      hist.undone = copyHistoryArray(histData.undone.slice(0), null, true);
+    },
+
+    addLineClass: docMethodOp(function(handle, where, cls) {
+      return changeLine(this, handle, where == "gutter" ? "gutter" : "class", function(line) {
+        var prop = where == "text" ? "textClass"
+                 : where == "background" ? "bgClass"
+                 : where == "gutter" ? "gutterClass" : "wrapClass";
+        if (!line[prop]) line[prop] = cls;
+        else if (classTest(cls).test(line[prop])) return false;
+        else line[prop] += " " + cls;
+        return true;
+      });
+    }),
+    removeLineClass: docMethodOp(function(handle, where, cls) {
+      return changeLine(this, handle, where == "gutter" ? "gutter" : "class", function(line) {
+        var prop = where == "text" ? "textClass"
+                 : where == "background" ? "bgClass"
+                 : where == "gutter" ? "gutterClass" : "wrapClass";
+        var cur = line[prop];
+        if (!cur) return false;
+        else if (cls == null) line[prop] = null;
+        else {
+          var found = cur.match(classTest(cls));
+          if (!found) return false;
+          var end = found.index + found[0].length;
+          line[prop] = cur.slice(0, found.index) + (!found.index || end == cur.length ? "" : " ") + cur.slice(end) || null;
+        }
+        return true;
+      });
+    }),
+
+    addLineWidget: docMethodOp(function(handle, node, options) {
+      return addLineWidget(this, handle, node, options);
+    }),
+    removeLineWidget: function(widget) { widget.clear(); },
+
+    markText: function(from, to, options) {
+      return markText(this, clipPos(this, from), clipPos(this, to), options, "range");
+    },
+    setBookmark: function(pos, options) {
+      var realOpts = {replacedWith: options && (options.nodeType == null ? options.widget : options),
+                      insertLeft: options && options.insertLeft,
+                      clearWhenEmpty: false, shared: options && options.shared,
+                      handleMouseEvents: options && options.handleMouseEvents};
+      pos = clipPos(this, pos);
+      return markText(this, pos, pos, realOpts, "bookmark");
+    },
+    findMarksAt: function(pos) {
+      pos = clipPos(this, pos);
+      var markers = [], spans = getLine(this, pos.line).markedSpans;
+      if (spans) for (var i = 0; i < spans.length; ++i) {
+        var span = spans[i];
+        if ((span.from == null || span.from <= pos.ch) &&
+            (span.to == null || span.to >= pos.ch))
+          markers.push(span.marker.parent || span.marker);
+      }
+      return markers;
+    },
+    findMarks: function(from, to, filter) {
+      from = clipPos(this, from); to = clipPos(this, to);
+      var found = [], lineNo = from.line;
+      this.iter(from.line, to.line + 1, function(line) {
+        var spans = line.markedSpans;
+        if (spans) for (var i = 0; i < spans.length; i++) {
+          var span = spans[i];
+          if (!(lineNo == from.line && from.ch > span.to ||
+                span.from == null && lineNo != from.line||
+                lineNo == to.line && span.from > to.ch) &&
+              (!filter || filter(span.marker)))
+            found.push(span.marker.parent || span.marker);
+        }
+        ++lineNo;
+      });
+      return found;
+    },
+    getAllMarks: function() {
+      var markers = [];
+      this.iter(function(line) {
+        var sps = line.markedSpans;
+        if (sps) for (var i = 0; i < sps.length; ++i)
+          if (sps[i].from != null) markers.push(sps[i].marker);
+      });
+      return markers;
+    },
+
+    posFromIndex: function(off) {
+      var ch, lineNo = this.first;
+      this.iter(function(line) {
+        var sz = line.text.length + 1;
+        if (sz > off) { ch = off; return true; }
+        off -= sz;
+        ++lineNo;
+      });
+      return clipPos(this, Pos(lineNo, ch));
+    },
+    indexFromPos: function (coords) {
+      coords = clipPos(this, coords);
+      var index = coords.ch;
+      if (coords.line < this.first || coords.ch < 0) return 0;
+      this.iter(this.first, coords.line, function (line) {
+        index += line.text.length + 1;
+      });
+      return index;
+    },
+
+    copy: function(copyHistory) {
+      var doc = new Doc(getLines(this, this.first, this.first + this.size),
+                        this.modeOption, this.first, this.lineSep);
+      doc.scrollTop = this.scrollTop; doc.scrollLeft = this.scrollLeft;
+      doc.sel = this.sel;
+      doc.extend = false;
+      if (copyHistory) {
+        doc.history.undoDepth = this.history.undoDepth;
+        doc.setHistory(this.getHistory());
+      }
+      return doc;
+    },
+
+    linkedDoc: function(options) {
+      if (!options) options = {};
+      var from = this.first, to = this.first + this.size;
+      if (options.from != null && options.from > from) from = options.from;
+      if (options.to != null && options.to < to) to = options.to;
+      var copy = new Doc(getLines(this, from, to), options.mode || this.modeOption, from, this.lineSep);
+      if (options.sharedHist) copy.history = this.history;
+      (this.linked || (this.linked = [])).push({doc: copy, sharedHist: options.sharedHist});
+      copy.linked = [{doc: this, isParent: true, sharedHist: options.sharedHist}];
+      copySharedMarkers(copy, findSharedMarkers(this));
+      return copy;
+    },
+    unlinkDoc: function(other) {
+      if (other instanceof CodeMirror) other = other.doc;
+      if (this.linked) for (var i = 0; i < this.linked.length; ++i) {
+        var link = this.linked[i];
+        if (link.doc != other) continue;
+        this.linked.splice(i, 1);
+        other.unlinkDoc(this);
+        detachSharedMarkers(findSharedMarkers(this));
+        break;
+      }
+      // If the histories were shared, split them again
+      if (other.history == this.history) {
+        var splitIds = [other.id];
+        linkedDocs(other, function(doc) {splitIds.push(doc.id);}, true);
+        other.history = new History(null);
+        other.history.done = copyHistoryArray(this.history.done, splitIds);
+        other.history.undone = copyHistoryArray(this.history.undone, splitIds);
+      }
+    },
+    iterLinkedDocs: function(f) {linkedDocs(this, f);},
+
+    getMode: function() {return this.mode;},
+    getEditor: function() {return this.cm;},
+
+    splitLines: function(str) {
+      if (this.lineSep) return str.split(this.lineSep);
+      return splitLinesAuto(str);
+    },
+    lineSeparator: function() { return this.lineSep || "\n"; }
+  });
+
+  // Public alias.
+  Doc.prototype.eachLine = Doc.prototype.iter;
+
+  // Set up methods on CodeMirror's prototype to redirect to the editor's document.
+  var dontDelegate = "iter insert remove copy getEditor constructor".split(" ");
+  for (var prop in Doc.prototype) if (Doc.prototype.hasOwnProperty(prop) && indexOf(dontDelegate, prop) < 0)
+    CodeMirror.prototype[prop] = (function(method) {
+      return function() {return method.apply(this.doc, arguments);};
+    })(Doc.prototype[prop]);
+
+  eventMixin(Doc);
+
+  // Call f for all linked documents.
+  function linkedDocs(doc, f, sharedHistOnly) {
+    function propagate(doc, skip, sharedHist) {
+      if (doc.linked) for (var i = 0; i < doc.linked.length; ++i) {
+        var rel = doc.linked[i];
+        if (rel.doc == skip) continue;
+        var shared = sharedHist && rel.sharedHist;
+        if (sharedHistOnly && !shared) continue;
+        f(rel.doc, shared);
+        propagate(rel.doc, doc, shared);
+      }
+    }
+    propagate(doc, null, true);
+  }
+
+  // Attach a document to an editor.
+  function attachDoc(cm, doc) {
+    if (doc.cm) throw new Error("This document is already in use.");
+    cm.doc = doc;
+    doc.cm = cm;
+    estimateLineHeights(cm);
+    loadMode(cm);
+    if (!cm.options.lineWrapping) findMaxLine(cm);
+    cm.options.mode = doc.modeOption;
+    regChange(cm);
+  }
+
+  // LINE UTILITIES
+
+  // Find the line object corresponding to the given line number.
+  function getLine(doc, n) {
+    n -= doc.first;
+    if (n < 0 || n >= doc.size) throw new Error("There is no line " + (n + doc.first) + " in the document.");
+    for (var chunk = doc; !chunk.lines;) {
+      for (var i = 0;; ++i) {
+        var child = chunk.children[i], sz = child.chunkSize();
+        if (n < sz) { chunk = child; break; }
+        n -= sz;
+      }
+    }
+    return chunk.lines[n];
+  }
+
+  // Get the part of a document between two positions, as an array of
+  // strings.
+  function getBetween(doc, start, end) {
+    var out = [], n = start.line;
+    doc.iter(start.line, end.line + 1, function(line) {
+      var text = line.text;
+      if (n == end.line) text = text.slice(0, end.ch);
+      if (n == start.line) text = text.slice(start.ch);
+      out.push(text);
+      ++n;
+    });
+    return out;
+  }
+  // Get the lines between from and to, as array of strings.
+  function getLines(doc, from, to) {
+    var out = [];
+    doc.iter(from, to, function(line) { out.push(line.text); });
+    return out;
+  }
+
+  // Update the height of a line, propagating the height change
+  // upwards to parent nodes.
+  function updateLineHeight(line, height) {
+    var diff = height - line.height;
+    if (diff) for (var n = line; n; n = n.parent) n.height += diff;
+  }
+
+  // Given a line object, find its line number by walking up through
+  // its parent links.
+  function lineNo(line) {
+    if (line.parent == null) return null;
+    var cur = line.parent, no = indexOf(cur.lines, line);
+    for (var chunk = cur.parent; chunk; cur = chunk, chunk = chunk.parent) {
+      for (var i = 0;; ++i) {
+        if (chunk.children[i] == cur) break;
+        no += chunk.children[i].chunkSize();
+      }
+    }
+    return no + cur.first;
+  }
+
+  // Find the line at the given vertical position, using the height
+  // information in the document tree.
+  function lineAtHeight(chunk, h) {
+    var n = chunk.first;
+    outer: do {
+      for (var i = 0; i < chunk.children.length; ++i) {
+        var child = chunk.children[i], ch = child.height;
+        if (h < ch) { chunk = child; continue outer; }
+        h -= ch;
+        n += child.chunkSize();
+      }
+      return n;
+    } while (!chunk.lines);
+    for (var i = 0; i < chunk.lines.length; ++i) {
+      var line = chunk.lines[i], lh = line.height;
+      if (h < lh) break;
+      h -= lh;
+    }
+    return n + i;
+  }
+
+
+  // Find the height above the given line.
+  function heightAtLine(lineObj) {
+    lineObj = visualLine(lineObj);
+
+    var h = 0, chunk = lineObj.parent;
+    for (var i = 0; i < chunk.lines.length; ++i) {
+      var line = chunk.lines[i];
+      if (line == lineObj) break;
+      else h += line.height;
+    }
+    for (var p = chunk.parent; p; chunk = p, p = chunk.parent) {
+      for (var i = 0; i < p.children.length; ++i) {
+        var cur = p.children[i];
+        if (cur == chunk) break;
+        else h += cur.height;
+      }
+    }
+    return h;
+  }
+
+  // Get the bidi ordering for the given line (and cache it). Returns
+  // false for lines that are fully left-to-right, and an array of
+  // BidiSpan objects otherwise.
+  function getOrder(line) {
+    var order = line.order;
+    if (order == null) order = line.order = bidiOrdering(line.text);
+    return order;
+  }
+
+  // HISTORY
+
+  function History(startGen) {
+    // Arrays of change events and selections. Doing something adds an
+    // event to done and clears undo. Undoing moves events from done
+    // to undone, redoing moves them in the other direction.
+    this.done = []; this.undone = [];
+    this.undoDepth = Infinity;
+    // Used to track when changes can be merged into a single undo
+    // event
+    this.lastModTime = this.lastSelTime = 0;
+    this.lastOp = this.lastSelOp = null;
+    this.lastOrigin = this.lastSelOrigin = null;
+    // Used by the isClean() method
+    this.generation = this.maxGeneration = startGen || 1;
+  }
+
+  // Create a history change event from an updateDoc-style change
+  // object.
+  function historyChangeFromChange(doc, change) {
+    var histChange = {from: copyPos(change.from), to: changeEnd(change), text: getBetween(doc, change.from, change.to)};
+    attachLocalSpans(doc, histChange, change.from.line, change.to.line + 1);
+    linkedDocs(doc, function(doc) {attachLocalSpans(doc, histChange, change.from.line, change.to.line + 1);}, true);
+    return histChange;
+  }
+
+  // Pop all selection events off the end of a history array. Stop at
+  // a change event.
+  function clearSelectionEvents(array) {
+    while (array.length) {
+      var last = lst(array);
+      if (last.ranges) array.pop();
+      else break;
+    }
+  }
+
+  // Find the top change event in the history. Pop off selection
+  // events that are in the way.
+  function lastChangeEvent(hist, force) {
+    if (force) {
+      clearSelectionEvents(hist.done);
+      return lst(hist.done);
+    } else if (hist.done.length && !lst(hist.done).ranges) {
+      return lst(hist.done);
+    } else if (hist.done.length > 1 && !hist.done[hist.done.length - 2].ranges) {
+      hist.done.pop();
+      return lst(hist.done);
+    }
+  }
+
+  // Register a change in the history. Merges changes that are within
+  // a single operation, ore are close together with an origin that
+  // allows merging (starting with "+") into a single event.
+  function addChangeToHistory(doc, change, selAfter, opId) {
+    var hist = doc.history;
+    hist.undone.length = 0;
+    var time = +new Date, cur;
+
+    if ((hist.lastOp == opId ||
+         hist.lastOrigin == change.origin && change.origin &&
+         ((change.origin.charAt(0) == "+" && doc.cm && hist.lastModTime > time - doc.cm.options.historyEventDelay) ||
+          change.origin.charAt(0) == "*")) &&
+        (cur = lastChangeEvent(hist, hist.lastOp == opId))) {
+      // Merge this change into the last event
+      var last = lst(cur.changes);
+      if (cmp(change.from, change.to) == 0 && cmp(change.from, last.to) == 0) {
+        // Optimized case for simple insertion -- don't want to add
+        // new changesets for every character typed
+        last.to = changeEnd(change);
+      } else {
+        // Add new sub-event
+        cur.changes.push(historyChangeFromChange(doc, change));
+      }
+    } else {
+      // Can not be merged, start a new event.
+      var before = lst(hist.done);
+      if (!before || !before.ranges)
+        pushSelectionToHistory(doc.sel, hist.done);
+      cur = {changes: [historyChangeFromChange(doc, change)],
+             generation: hist.generation};
+      hist.done.push(cur);
+      while (hist.done.length > hist.undoDepth) {
+        hist.done.shift();
+        if (!hist.done[0].ranges) hist.done.shift();
+      }
+    }
+    hist.done.push(selAfter);
+    hist.generation = ++hist.maxGeneration;
+    hist.lastModTime = hist.lastSelTime = time;
+    hist.lastOp = hist.lastSelOp = opId;
+    hist.lastOrigin = hist.lastSelOrigin = change.origin;
+
+    if (!last) signal(doc, "historyAdded");
+  }
+
+  function selectionEventCanBeMerged(doc, origin, prev, sel) {
+    var ch = origin.charAt(0);
+    return ch == "*" ||
+      ch == "+" &&
+      prev.ranges.length == sel.ranges.length &&
+      prev.somethingSelected() == sel.somethingSelected() &&
+      new Date - doc.history.lastSelTime <= (doc.cm ? doc.cm.options.historyEventDelay : 500);
+  }
+
+  // Called whenever the selection changes, sets the new selection as
+  // the pending selection in the history, and pushes the old pending
+  // selection into the 'done' array when it was significantly
+  // different (in number of selected ranges, emptiness, or time).
+  function addSelectionToHistory(doc, sel, opId, options) {
+    var hist = doc.history, origin = options && options.origin;
+
+    // A new event is started when the previous origin does not match
+    // the current, or the origins don't allow matching. Origins
+    // starting with * are always merged, those starting with + are
+    // merged when similar and close together in time.
+    if (opId == hist.lastSelOp ||
+        (origin && hist.lastSelOrigin == origin &&
+         (hist.lastModTime == hist.lastSelTime && hist.lastOrigin == origin ||
+          selectionEventCanBeMerged(doc, origin, lst(hist.done), sel))))
+      hist.done[hist.done.length - 1] = sel;
+    else
+      pushSelectionToHistory(sel, hist.done);
+
+    hist.lastSelTime = +new Date;
+    hist.lastSelOrigin = origin;
+    hist.lastSelOp = opId;
+    if (options && options.clearRedo !== false)
+      clearSelectionEvents(hist.undone);
+  }
+
+  function pushSelectionToHistory(sel, dest) {
+    var top = lst(dest);
+    if (!(top && top.ranges && top.equals(sel)))
+      dest.push(sel);
+  }
+
+  // Used to store marked span information in the history.
+  function attachLocalSpans(doc, change, from, to) {
+    var existing = change["spans_" + doc.id], n = 0;
+    doc.iter(Math.max(doc.first, from), Math.min(doc.first + doc.size, to), function(line) {
+      if (line.markedSpans)
+        (existing || (existing = change["spans_" + doc.id] = {}))[n] = line.markedSpans;
+      ++n;
+    });
+  }
+
+  // When un/re-doing restores text containing marked spans, those
+  // that have been explicitly cleared should not be restored.
+  function removeClearedSpans(spans) {
+    if (!spans) return null;
+    for (var i = 0, out; i < spans.length; ++i) {
+      if (spans[i].marker.explicitlyCleared) { if (!out) out = spans.slice(0, i); }
+      else if (out) out.push(spans[i]);
+    }
+    return !out ? spans : out.length ? out : null;
+  }
+
+  // Retrieve and filter the old marked spans stored in a change event.
+  function getOldSpans(doc, change) {
+    var found = change["spans_" + doc.id];
+    if (!found) return null;
+    for (var i = 0, nw = []; i < change.text.length; ++i)
+      nw.push(removeClearedSpans(found[i]));
+    return nw;
+  }
+
+  // Used both to provide a JSON-safe object in .getHistory, and, when
+  // detaching a document, to split the history in two
+  function copyHistoryArray(events, newGroup, instantiateSel) {
+    for (var i = 0, copy = []; i < events.length; ++i) {
+      var event = events[i];
+      if (event.ranges) {
+        copy.push(instantiateSel ? Selection.prototype.deepCopy.call(event) : event);
+        continue;
+      }
+      var changes = event.changes, newChanges = [];
+      copy.push({changes: newChanges});
+      for (var j = 0; j < changes.length; ++j) {
+        var change = changes[j], m;
+        newChanges.push({from: change.from, to: change.to, text: change.text});
+        if (newGroup) for (var prop in change) if (m = prop.match(/^spans_(\d+)$/)) {
+          if (indexOf(newGroup, Number(m[1])) > -1) {
+            lst(newChanges)[prop] = change[prop];
+            delete change[prop];
+          }
+        }
+      }
+    }
+    return copy;
+  }
+
+  // Rebasing/resetting history to deal with externally-sourced changes
+
+  function rebaseHistSelSingle(pos, from, to, diff) {
+    if (to < pos.line) {
+      pos.line += diff;
+    } else if (from < pos.line) {
+      pos.line = from;
+      pos.ch = 0;
+    }
+  }
+
+  // Tries to rebase an array of history events given a change in the
+  // document. If the change touches the same lines as the event, the
+  // event, and everything 'behind' it, is discarded. If the change is
+  // before the event, the event's positions are updated. Uses a
+  // copy-on-write scheme for the positions, to avoid having to
+  // reallocate them all on every rebase, but also avoid problems with
+  // shared position objects being unsafely updated.
+  function rebaseHistArray(array, from, to, diff) {
+    for (var i = 0; i < array.length; ++i) {
+      var sub = array[i], ok = true;
+      if (sub.ranges) {
+        if (!sub.copied) { sub = array[i] = sub.deepCopy(); sub.copied = true; }
+        for (var j = 0; j < sub.ranges.length; j++) {
+          rebaseHistSelSingle(sub.ranges[j].anchor, from, to, diff);
+          rebaseHistSelSingle(sub.ranges[j].head, from, to, diff);
+        }
+        continue;
+      }
+      for (var j = 0; j < sub.changes.length; ++j) {
+        var cur = sub.changes[j];
+        if (to < cur.from.line) {
+          cur.from = Pos(cur.from.line + diff, cur.from.ch);
+          cur.to = Pos(cur.to.line + diff, cur.to.ch);
+        } else if (from <= cur.to.line) {
+          ok = false;
+          break;
+        }
+      }
+      if (!ok) {
+        array.splice(0, i + 1);
+        i = 0;
+      }
+    }
+  }
+
+  function rebaseHist(hist, change) {
+    var from = change.from.line, to = change.to.line, diff = change.text.length - (to - from) - 1;
+    rebaseHistArray(hist.done, from, to, diff);
+    rebaseHistArray(hist.undone, from, to, diff);
+  }
+
+  // EVENT UTILITIES
+
+  // Due to the fact that we still support jurassic IE versions, some
+  // compatibility wrappers are needed.
+
+  var e_preventDefault = CodeMirror.e_preventDefault = function(e) {
+    if (e.preventDefault) e.preventDefault();
+    else e.returnValue = false;
+  };
+  var e_stopPropagation = CodeMirror.e_stopPropagation = function(e) {
+    if (e.stopPropagation) e.stopPropagation();
+    else e.cancelBubble = true;
+  };
+  function e_defaultPrevented(e) {
+    return e.defaultPrevented != null ? e.defaultPrevented : e.returnValue == false;
+  }
+  var e_stop = CodeMirror.e_stop = function(e) {e_preventDefault(e); e_stopPropagation(e);};
+
+  function e_target(e) {return e.target || e.srcElement;}
+  function e_button(e) {
+    var b = e.which;
+    if (b == null) {
+      if (e.button & 1) b = 1;
+      else if (e.button & 2) b = 3;
+      else if (e.button & 4) b = 2;
+    }
+    if (mac && e.ctrlKey && b == 1) b = 3;
+    return b;
+  }
+
+  // EVENT HANDLING
+
+  // Lightweight event framework. on/off also work on DOM nodes,
+  // registering native DOM handlers.
+
+  var on = CodeMirror.on = function(emitter, type, f) {
+    if (emitter.addEventListener)
+      emitter.addEventListener(type, f, false);
+    else if (emitter.attachEvent)
+      emitter.attachEvent("on" + type, f);
+    else {
+      var map = emitter._handlers || (emitter._handlers = {});
+      var arr = map[type] || (map[type] = []);
+      arr.push(f);
+    }
+  };
+
+  var off = CodeMirror.off = function(emitter, type, f) {
+    if (emitter.removeEventListener)
+      emitter.removeEventListener(type, f, false);
+    else if (emitter.detachEvent)
+      emitter.detachEvent("on" + type, f);
+    else {
+      var arr = emitter._handlers && emitter._handlers[type];
+      if (!arr) return;
+      for (var i = 0; i < arr.length; ++i)
+        if (arr[i] == f) { arr.splice(i, 1); break; }
+    }
+  };
+
+  var signal = CodeMirror.signal = function(emitter, type /*, values...*/) {
+    var arr = emitter._handlers && emitter._handlers[type];
+    if (!arr) return;
+    var args = Array.prototype.slice.call(arguments, 2);
+    for (var i = 0; i < arr.length; ++i) arr[i].apply(null, args);
+  };
+
+  var orphanDelayedCallbacks = null;
+
+  // Often, we want to signal events at a point where we are in the
+  // middle of some work, but don't want the handler to start calling
+  // other methods on the editor, which might be in an inconsistent
+  // state or simply not expect any other events to happen.
+  // signalLater looks whether there are any handlers, and schedules
+  // them to be executed when the last operation ends, or, if no
+  // operation is active, when a timeout fires.
+  function signalLater(emitter, type /*, values...*/) {
+    var arr = emitter._handlers && emitter._handlers[type];
+    if (!arr) return;
+    var args = Array.prototype.slice.call(arguments, 2), list;
+    if (operationGroup) {
+      list = operationGroup.delayedCallbacks;
+    } else if (orphanDelayedCallbacks) {
+      list = orphanDelayedCallbacks;
+    } else {
+      list = orphanDelayedCallbacks = [];
+      setTimeout(fireOrphanDelayed, 0);
+    }
+    function bnd(f) {return function(){f.apply(null, args);};};
+    for (var i = 0; i < arr.length; ++i)
+      list.push(bnd(arr[i]));
+  }
+
+  function fireOrphanDelayed() {
+    var delayed = orphanDelayedCallbacks;
+    orphanDelayedCallbacks = null;
+    for (var i = 0; i < delayed.length; ++i) delayed[i]();
+  }
+
+  // The DOM events that CodeMirror handles can be overridden by
+  // registering a (non-DOM) handler on the editor for the event name,
+  // and preventDefault-ing the event in that handler.
+  function signalDOMEvent(cm, e, override) {
+    if (typeof e == "string")
+      e = {type: e, preventDefault: function() { this.defaultPrevented = true; }};
+    signal(cm, override || e.type, cm, e);
+    return e_defaultPrevented(e) || e.codemirrorIgnore;
+  }
+
+  function signalCursorActivity(cm) {
+    var arr = cm._handlers && cm._handlers.cursorActivity;
+    if (!arr) return;
+    var set = cm.curOp.cursorActivityHandlers || (cm.curOp.cursorActivityHandlers = []);
+    for (var i = 0; i < arr.length; ++i) if (indexOf(set, arr[i]) == -1)
+      set.push(arr[i]);
+  }
+
+  function hasHandler(emitter, type) {
+    var arr = emitter._handlers && emitter._handlers[type];
+    return arr && arr.length > 0;
+  }
+
+  // Add on and off methods to a constructor's prototype, to make
+  // registering events on such objects more convenient.
+  function eventMixin(ctor) {
+    ctor.prototype.on = function(type, f) {on(this, type, f);};
+    ctor.prototype.off = function(type, f) {off(this, type, f);};
+  }
+
+  // MISC UTILITIES
+
+  // Number of pixels added to scroller and sizer to hide scrollbar
+  var scrollerGap = 30;
+
+  // Returned or thrown by various protocols to signal 'I'm not
+  // handling this'.
+  var Pass = CodeMirror.Pass = {toString: function(){return "CodeMirror.Pass";}};
+
+  // Reused option objects for setSelection & friends
+  var sel_dontScroll = {scroll: false}, sel_mouse = {origin: "*mouse"}, sel_move = {origin: "+move"};
+
+  function Delayed() {this.id = null;}
+  Delayed.prototype.set = function(ms, f) {
+    clearTimeout(this.id);
+    this.id = setTimeout(f, ms);
+  };
+
+  // Counts the column offset in a string, taking tabs into account.
+  // Used mostly to find indentation.
+  var countColumn = CodeMirror.countColumn = function(string, end, tabSize, startIndex, startValue) {
+    if (end == null) {
+      end = string.search(/[^\s\u00a0]/);
+      if (end == -1) end = string.length;
+    }
+    for (var i = startIndex || 0, n = startValue || 0;;) {
+      var nextTab = string.indexOf("\t", i);
+      if (nextTab < 0 || nextTab >= end)
+        return n + (end - i);
+      n += nextTab - i;
+      n += tabSize - (n % tabSize);
+      i = nextTab + 1;
+    }
+  };
+
+  // The inverse of countColumn -- find the offset that corresponds to
+  // a particular column.
+  function findColumn(string, goal, tabSize) {
+    for (var pos = 0, col = 0;;) {
+      var nextTab = string.indexOf("\t", pos);
+      if (nextTab == -1) nextTab = string.length;
+      var skipped = nextTab - pos;
+      if (nextTab == string.length || col + skipped >= goal)
+        return pos + Math.min(skipped, goal - col);
+      col += nextTab - pos;
+      col += tabSize - (col % tabSize);
+      pos = nextTab + 1;
+      if (col >= goal) return pos;
+    }
+  }
+
+  var spaceStrs = [""];
+  function spaceStr(n) {
+    while (spaceStrs.length <= n)
+      spaceStrs.push(lst(spaceStrs) + " ");
+    return spaceStrs[n];
+  }
+
+  function lst(arr) { return arr[arr.length-1]; }
+
+  var selectInput = function(node) { node.select(); };
+  if (ios) // Mobile Safari apparently has a bug where select() is broken.
+    selectInput = function(node) { node.selectionStart = 0; node.selectionEnd = node.value.length; };
+  else if (ie) // Suppress mysterious IE10 errors
+    selectInput = function(node) { try { node.select(); } catch(_e) {} };
+
+  function indexOf(array, elt) {
+    for (var i = 0; i < array.length; ++i)
+      if (array[i] == elt) return i;
+    return -1;
+  }
+  function map(array, f) {
+    var out = [];
+    for (var i = 0; i < array.length; i++) out[i] = f(array[i], i);
+    return out;
+  }
+
+  function nothing() {}
+
+  function createObj(base, props) {
+    var inst;
+    if (Object.create) {
+      inst = Object.create(base);
+    } else {
+      nothing.prototype = base;
+      inst = new nothing();
+    }
+    if (props) copyObj(props, inst);
+    return inst;
+  };
+
+  function copyObj(obj, target, overwrite) {
+    if (!target) target = {};
+    for (var prop in obj)
+      if (obj.hasOwnProperty(prop) && (overwrite !== false || !target.hasOwnProperty(prop)))
+        target[prop] = obj[prop];
+    return target;
+  }
+
+  function bind(f) {
+    var args = Array.prototype.slice.call(arguments, 1);
+    return function(){return f.apply(null, args);};
+  }
+
+  var nonASCIISingleCaseWordChar = /[\u00df\u0587\u0590-\u05f4\u0600-\u06ff\u3040-\u309f\u30a0-\u30ff\u3400-\u4db5\u4e00-\u9fcc\uac00-\ud7af]/;
+  var isWordCharBasic = CodeMirror.isWordChar = function(ch) {
+    return /\w/.test(ch) || ch > "\x80" &&
+      (ch.toUpperCase() != ch.toLowerCase() || nonASCIISingleCaseWordChar.test(ch));
+  };
+  function isWordChar(ch, helper) {
+    if (!helper) return isWordCharBasic(ch);
+    if (helper.source.indexOf("\\w") > -1 && isWordCharBasic(ch)) return true;
+    return helper.test(ch);
+  }
+
+  function isEmpty(obj) {
+    for (var n in obj) if (obj.hasOwnProperty(n) && obj[n]) return false;
+    return true;
+  }
+
+  // Extending unicode characters. A series of a non-extending char +
+  // any number of extending chars is treated as a single unit as far
+  // as editing and measuring is concerned. This is not fully correct,
+  // since some scripts/fonts/browsers also treat other configurations
+  // of code points as a group.
+  var extendingChars = /[\u0300-\u036f\u0483-\u0489\u0591-\u05bd\u05bf\u05c1\u05c2\u05c4\u05c5\u05c7\u0610-\u061a\u064b-\u065e\u0670\u06d6-\u06dc\u06de-\u06e4\u06e7\u06e8\u06ea-\u06ed\u0711\u0730-\u074a\u07a6-\u07b0\u07eb-\u07f3\u0816-\u0819\u081b-\u0823\u0825-\u0827\u0829-\u082d\u0900-\u0902\u093c\u0941-\u0948\u094d\u0951-\u0955\u0962\u0963\u0981\u09bc\u09be\u09c1-\u09c4\u09cd\u09d7\u09e2\u09e3\u0a01\u0a02\u0a3c\u0a41\u0a42\u0a47\u0a48\u0a4b-\u0a4d\u0a51\u0a70\u0a71\u0a75\u0a81\u0a82\u0abc\u0ac1-\u0ac5\u0ac7\u0ac8\u0acd\u0ae2\u0ae3\u0b01\u0b3c\u0b3e\u0b3f\u0b41-\u0b44\u0b4d\u0b56\u0b57\u0b62\u0b63\u0b82\u0bbe\u0bc0\u0bcd\u0bd7\u0c3e-\u0c40\u0c46-\u0c48\u0c4a-\u0c4d\u0c55\u0c56\u0c62\u0c63\u0cbc\u0cbf\u0cc2\u0cc6\u0ccc\u0ccd\u0cd5\u0cd6\u0ce2\u0ce3\u0d3e\u0d41-\u0d44\u0d4d\u0d57\u0d62\u0d63\u0dca\u0dcf\u0dd2-\u0dd4\u0dd6\u0ddf\u0e31\u0e34-\u0e3a\u0e47-\u0e4e\u0eb1\u0eb4-\u0eb9\u0ebb\u0ebc\u0ec8-\u0ecd\u0f18\u0f19\u0f35\u0f37\u0f39\u0f71-\u0f7e\u0f80-\u0f84\u0f86\u0f87\u0f90-\u0f97\u0f99-\u0fbc\u0fc6\u102d-\u1030\u1032-\u1037\u1039\u103a\u103d\u103e\u1058\u1059\u105e-\u1060\u1071-\u1074\u1082\u1085\u1086\u108d\u109d\u135f\u1712-\u1714\u1732-\u1734\u1752\u1753\u1772\u1773\u17b7-\u17bd\u17c6\u17c9-\u17d3\u17dd\u180b-\u180d\u18a9\u1920-\u1922\u1927\u1928\u1932\u1939-\u193b\u1a17\u1a18\u1a56\u1a58-\u1a5e\u1a60\u1a62\u1a65-\u1a6c\u1a73-\u1a7c\u1a7f\u1b00-\u1b03\u1b34\u1b36-\u1b3a\u1b3c\u1b42\u1b6b-\u1b73\u1b80\u1b81\u1ba2-\u1ba5\u1ba8\u1ba9\u1c2c-\u1c33\u1c36\u1c37\u1cd0-\u1cd2\u1cd4-\u1ce0\u1ce2-\u1ce8\u1ced\u1dc0-\u1de6\u1dfd-\u1dff\u200c\u200d\u20d0-\u20f0\u2cef-\u2cf1\u2de0-\u2dff\u302a-\u302f\u3099\u309a\ua66f-\ua672\ua67c\ua67d\ua6f0\ua6f1\ua802\ua806\ua80b\ua825\ua826\ua8c4\ua8e0-\ua8f1\ua926-\ua92d\ua947-\ua951\ua980-\ua982\ua9b3\ua9b6-\ua9b9\ua9bc\uaa29-\uaa2e\uaa31\uaa32\uaa35\uaa36\uaa43\uaa4c\uaab0\uaab2-\uaab4\uaab7\uaab8\uaabe\uaabf\uaac1\uabe5\uabe8\uabed\udc00-\udfff\ufb1e\ufe00-\ufe0f\ufe20-\ufe26\uff9e\uff9f]/;
+  function isExtendingChar(ch) { return ch.charCodeAt(0) >= 768 && extendingChars.test(ch); }
+
+  // DOM UTILITIES
+
+  function elt(tag, content, className, style) {
+    var e = document.createElement(tag);
+    if (className) e.className = className;
+    if (style) e.style.cssText = style;
+    if (typeof content == "string") e.appendChild(document.createTextNode(content));
+    else if (content) for (var i = 0; i < content.length; ++i) e.appendChild(content[i]);
+    return e;
+  }
+
+  var range;
+  if (document.createRange) range = function(node, start, end, endNode) {
+    var r = document.createRange();
+    r.setEnd(endNode || node, end);
+    r.setStart(node, start);
+    return r;
+  };
+  else range = function(node, start, end) {
+    var r = document.body.createTextRange();
+    try { r.moveToElementText(node.parentNode); }
+    catch(e) { return r; }
+    r.collapse(true);
+    r.moveEnd("character", end);
+    r.moveStart("character", start);
+    return r;
+  };
+
+  function removeChildren(e) {
+    for (var count = e.childNodes.length; count > 0; --count)
+      e.removeChild(e.firstChild);
+    return e;
+  }
+
+  function removeChildrenAndAdd(parent, e) {
+    return removeChildren(parent).appendChild(e);
+  }
+
+  var contains = CodeMirror.contains = function(parent, child) {
+    if (child.nodeType == 3) // Android browser always returns false when child is a textnode
+      child = child.parentNode;
+    if (parent.contains)
+      return parent.contains(child);
+    do {
+      if (child.nodeType == 11) child = child.host;
+      if (child == parent) return true;
+    } while (child = child.parentNode);
+  };
+
+  function activeElt() {
+    var activeElement = document.activeElement;
+    while (activeElement && activeElement.root && activeElement.root.activeElement)
+      activeElement = activeElement.root.activeElement;
+    return activeElement;
+  }
+  // Older versions of IE throws unspecified error when touching
+  // document.activeElement in some cases (during loading, in iframe)
+  if (ie && ie_version < 11) activeElt = function() {
+    try { return document.activeElement; }
+    catch(e) { return document.body; }
+  };
+
+  function classTest(cls) { return new RegExp("(^|\\s)" + cls + "(?:$|\\s)\\s*"); }
+  var rmClass = CodeMirror.rmClass = function(node, cls) {
+    var current = node.className;
+    var match = classTest(cls).exec(current);
+    if (match) {
+      var after = current.slice(match.index + match[0].length);
+      node.className = current.slice(0, match.index) + (after ? match[1] + after : "");
+    }
+  };
+  var addClass = CodeMirror.addClass = function(node, cls) {
+    var current = node.className;
+    if (!classTest(cls).test(current)) node.className += (current ? " " : "") + cls;
+  };
+  function joinClasses(a, b) {
+    var as = a.split(" ");
+    for (var i = 0; i < as.length; i++)
+      if (as[i] && !classTest(as[i]).test(b)) b += " " + as[i];
+    return b;
+  }
+
+  // WINDOW-WIDE EVENTS
+
+  // These must be handled carefully, because naively registering a
+  // handler for each editor will cause the editors to never be
+  // garbage collected.
+
+  function forEachCodeMirror(f) {
+    if (!document.body.getElementsByClassName) return;
+    var byClass = document.body.getElementsByClassName("CodeMirror");
+    for (var i = 0; i < byClass.length; i++) {
+      var cm = byClass[i].CodeMirror;
+      if (cm) f(cm);
+    }
+  }
+
+  var globalsRegistered = false;
+  function ensureGlobalHandlers() {
+    if (globalsRegistered) return;
+    registerGlobalHandlers();
+    globalsRegistered = true;
+  }
+  function registerGlobalHandlers() {
+    // When the window resizes, we need to refresh active editors.
+    var resizeTimer;
+    on(window, "resize", function() {
+      if (resizeTimer == null) resizeTimer = setTimeout(function() {
+        resizeTimer = null;
+        forEachCodeMirror(onResize);
+      }, 100);
+    });
+    // When the window loses focus, we want to show the editor as blurred
+    on(window, "blur", function() {
+      forEachCodeMirror(onBlur);
+    });
+  }
+
+  // FEATURE DETECTION
+
+  // Detect drag-and-drop
+  var dragAndDrop = function() {
+    // There is *some* kind of drag-and-drop support in IE6-8, but I
+    // couldn't get it to work yet.
+    if (ie && ie_version < 9) return false;
+    var div = elt('div');
+    return "draggable" in div || "dragDrop" in div;
+  }();
+
+  var zwspSupported;
+  function zeroWidthElement(measure) {
+    if (zwspSupported == null) {
+      var test = elt("span", "\u200b");
+      removeChildrenAndAdd(measure, elt("span", [test, document.createTextNode("x")]));
+      if (measure.firstChild.offsetHeight != 0)
+        zwspSupported = test.offsetWidth <= 1 && test.offsetHeight > 2 && !(ie && ie_version < 8);
+    }
+    var node = zwspSupported ? elt("span", "\u200b") :
+      elt("span", "\u00a0", null, "display: inline-block; width: 1px; margin-right: -1px");
+    node.setAttribute("cm-text", "");
+    return node;
+  }
+
+  // Feature-detect IE's crummy client rect reporting for bidi text
+  var badBidiRects;
+  function hasBadBidiRects(measure) {
+    if (badBidiRects != null) return badBidiRects;
+    var txt = removeChildrenAndAdd(measure, document.createTextNode("A\u062eA"));
+    var r0 = range(txt, 0, 1).getBoundingClientRect();
+    if (!r0 || r0.left == r0.right) return false; // Safari returns null in some cases (#2780)
+    var r1 = range(txt, 1, 2).getBoundingClientRect();
+    return badBidiRects = (r1.right - r0.right < 3);
+  }
+
+  // See if "".split is the broken IE version, if so, provide an
+  // alternative way to split lines.
+  var splitLinesAuto = CodeMirror.splitLines = "\n\nb".split(/\n/).length != 3 ? function(string) {
+    var pos = 0, result = [], l = string.length;
+    while (pos <= l) {
+      var nl = string.indexOf("\n", pos);
+      if (nl == -1) nl = string.length;
+      var line = string.slice(pos, string.charAt(nl - 1) == "\r" ? nl - 1 : nl);
+      var rt = line.indexOf("\r");
+      if (rt != -1) {
+        result.push(line.slice(0, rt));
+        pos += rt + 1;
+      } else {
+        result.push(line);
+        pos = nl + 1;
+      }
+    }
+    return result;
+  } : function(string){return string.split(/\r\n?|\n/);};
+
+  var hasSelection = window.getSelection ? function(te) {
+    try { return te.selectionStart != te.selectionEnd; }
+    catch(e) { return false; }
+  } : function(te) {
+    try {var range = te.ownerDocument.selection.createRange();}
+    catch(e) {}
+    if (!range || range.parentElement() != te) return false;
+    return range.compareEndPoints("StartToEnd", range) != 0;
+  };
+
+  var hasCopyEvent = (function() {
+    var e = elt("div");
+    if ("oncopy" in e) return true;
+    e.setAttribute("oncopy", "return;");
+    return typeof e.oncopy == "function";
+  })();
+
+  var badZoomedRects = null;
+  function hasBadZoomedRects(measure) {
+    if (badZoomedRects != null) return badZoomedRects;
+    var node = removeChildrenAndAdd(measure, elt("span", "x"));
+    var normal = node.getBoundingClientRect();
+    var fromRange = range(node, 0, 1).getBoundingClientRect();
+    return badZoomedRects = Math.abs(normal.left - fromRange.left) > 1;
+  }
+
+  // KEY NAMES
+
+  var keyNames = {3: "Enter", 8: "Backspace", 9: "Tab", 13: "Enter", 16: "Shift", 17: "Ctrl", 18: "Alt",
+                  19: "Pause", 20: "CapsLock", 27: "Esc", 32: "Space", 33: "PageUp", 34: "PageDown", 35: "End",
+                  36: "Home", 37: "Left", 38: "Up", 39: "Right", 40: "Down", 44: "PrintScrn", 45: "Insert",
+                  46: "Delete", 59: ";", 61: "=", 91: "Mod", 92: "Mod", 93: "Mod", 107: "=", 109: "-", 127: "Delete",
+                  173: "-", 186: ";", 187: "=", 188: ",", 189: "-", 190: ".", 191: "/", 192: "`", 219: "[", 220: "\\",
+                  221: "]", 222: "'", 63232: "Up", 63233: "Down", 63234: "Left", 63235: "Right", 63272: "Delete",
+                  63273: "Home", 63275: "End", 63276: "PageUp", 63277: "PageDown", 63302: "Insert"};
+  CodeMirror.keyNames = keyNames;
+  (function() {
+    // Number keys
+    for (var i = 0; i < 10; i++) keyNames[i + 48] = keyNames[i + 96] = String(i);
+    // Alphabetic keys
+    for (var i = 65; i <= 90; i++) keyNames[i] = String.fromCharCode(i);
+    // Function keys
+    for (var i = 1; i <= 12; i++) keyNames[i + 111] = keyNames[i + 63235] = "F" + i;
+  })();
+
+  // BIDI HELPERS
+
+  function iterateBidiSections(order, from, to, f) {
+    if (!order) return f(from, to, "ltr");
+    var found = false;
+    for (var i = 0; i < order.length; ++i) {
+      var part = order[i];
+      if (part.from < to && part.to > from || from == to && part.to == from) {
+        f(Math.max(part.from, from), Math.min(part.to, to), part.level == 1 ? "rtl" : "ltr");
+        found = true;
+      }
+    }
+    if (!found) f(from, to, "ltr");
+  }
+
+  function bidiLeft(part) { return part.level % 2 ? part.to : part.from; }
+  function bidiRight(part) { return part.level % 2 ? part.from : part.to; }
+
+  function lineLeft(line) { var order = getOrder(line); return order ? bidiLeft(order[0]) : 0; }
+  function lineRight(line) {
+    var order = getOrder(line);
+    if (!order) return line.text.length;
+    return bidiRight(lst(order));
+  }
+
+  function lineStart(cm, lineN) {
+    var line = getLine(cm.doc, lineN);
+    var visual = visualLine(line);
+    if (visual != line) lineN = lineNo(visual);
+    var order = getOrder(visual);
+    var ch = !order ? 0 : order[0].level % 2 ? lineRight(visual) : lineLeft(visual);
+    return Pos(lineN, ch);
+  }
+  function lineEnd(cm, lineN) {
+    var merged, line = getLine(cm.doc, lineN);
+    while (merged = collapsedSpanAtEnd(line)) {
+      line = merged.find(1, true).line;
+      lineN = null;
+    }
+    var order = getOrder(line);
+    var ch = !order ? line.text.length : order[0].level % 2 ? lineLeft(line) : lineRight(line);
+    return Pos(lineN == null ? lineNo(line) : lineN, ch);
+  }
+  function lineStartSmart(cm, pos) {
+    var start = lineStart(cm, pos.line);
+    var line = getLine(cm.doc, start.line);
+    var order = getOrder(line);
+    if (!order || order[0].level == 0) {
+      var firstNonWS = Math.max(0, line.text.search(/\S/));
+      var inWS = pos.line == start.line && pos.ch <= firstNonWS && pos.ch;
+      return Pos(start.line, inWS ? 0 : firstNonWS);
+    }
+    return start;
+  }
+
+  function compareBidiLevel(order, a, b) {
+    var linedir = order[0].level;
+    if (a == linedir) return true;
+    if (b == linedir) return false;
+    return a < b;
+  }
+  var bidiOther;
+  function getBidiPartAt(order, pos) {
+    bidiOther = null;
+    for (var i = 0, found; i < order.length; ++i) {
+      var cur = order[i];
+      if (cur.from < pos && cur.to > pos) return i;
+      if ((cur.from == pos || cur.to == pos)) {
+        if (found == null) {
+          found = i;
+        } else if (compareBidiLevel(order, cur.level, order[found].level)) {
+          if (cur.from != cur.to) bidiOther = found;
+          return i;
+        } else {
+          if (cur.from != cur.to) bidiOther = i;
+          return found;
+        }
+      }
+    }
+    return found;
+  }
+
+  function moveInLine(line, pos, dir, byUnit) {
+    if (!byUnit) return pos + dir;
+    do pos += dir;
+    while (pos > 0 && isExtendingChar(line.text.charAt(pos)));
+    return pos;
+  }
+
+  // This is needed in order to move 'visually' through bi-directional
+  // text -- i.e., pressing left should make the cursor go left, even
+  // when in RTL text. The tricky part is the 'jumps', where RTL and
+  // LTR text touch each other. This often requires the cursor offset
+  // to move more than one unit, in order to visually move one unit.
+  function moveVisually(line, start, dir, byUnit) {
+    var bidi = getOrder(line);
+    if (!bidi) return moveLogically(line, start, dir, byUnit);
+    var pos = getBidiPartAt(bidi, start), part = bidi[pos];
+    var target = moveInLine(line, start, part.level % 2 ? -dir : dir, byUnit);
+
+    for (;;) {
+      if (target > part.from && target < part.to) return target;
+      if (target == part.from || target == part.to) {
+        if (getBidiPartAt(bidi, target) == pos) return target;
+        part = bidi[pos += dir];
+        return (dir > 0) == part.level % 2 ? part.to : part.from;
+      } else {
+        part = bidi[pos += dir];
+        if (!part) return null;
+        if ((dir > 0) == part.level % 2)
+          target = moveInLine(line, part.to, -1, byUnit);
+        else
+          target = moveInLine(line, part.from, 1, byUnit);
+      }
+    }
+  }
+
+  function moveLogically(line, start, dir, byUnit) {
+    var target = start + dir;
+    if (byUnit) while (target > 0 && isExtendingChar(line.text.charAt(target))) target += dir;
+    return target < 0 || target > line.text.length ? null : target;
+  }
+
+  // Bidirectional ordering algorithm
+  // See http://unicode.org/reports/tr9/tr9-13.html for the algorithm
+  // that this (partially) implements.
+
+  // One-char codes used for character types:
+  // L (L):   Left-to-Right
+  // R (R):   Right-to-Left
+  // r (AL):  Right-to-Left Arabic
+  // 1 (EN):  European Number
+  // + (ES):  European Number Separator
+  // % (ET):  European Number Terminator
+  // n (AN):  Arabic Number
+  // , (CS):  Common Number Separator
+  // m (NSM): Non-Spacing Mark
+  // b (BN):  Boundary Neutral
+  // s (B):   Paragraph Separator
+  // t (S):   Segment Separator
+  // w (WS):  Whitespace
+  // N (ON):  Other Neutrals
+
+  // Returns null if characters are ordered as they appear
+  // (left-to-right), or an array of sections ({from, to, level}
+  // objects) in the order in which they occur visually.
+  var bidiOrdering = (function() {
+    // Character types for codepoints 0 to 0xff
+    var lowTypes = "bbbbbbbbbtstwsbbbbbbbbbbbbbbssstwNN%%%NNNNNN,N,N1111111111NNNNNNNLLLLLLLLLLLLLLLLLLLLLLLLLLNNNNNNLLLLLLLLLLLLLLLLLLLLLLLLLLNNNNbbbbbbsbbbbbbbbbbbbbbbbbbbbbbbbbb,N%%%%NNNNLNNNNN%%11NLNNN1LNNNNNLLLLLLLLLLLLLLLLLLLLLLLNLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLN";
+    // Character types for codepoints 0x600 to 0x6ff
+    var arabicTypes = "rrrrrrrrrrrr,rNNmmmmmmrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrmmmmmmmmmmmmmmrrrrrrrnnnnnnnnnn%nnrrrmrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrmmmmmmmmmmmmmmmmmmmNmmmm";
+    function charType(code) {
+      if (code <= 0xf7) return lowTypes.charAt(code);
+      else if (0x590 <= code && code <= 0x5f4) return "R";
+      else if (0x600 <= code && code <= 0x6ed) return arabicTypes.charAt(code - 0x600);
+      else if (0x6ee <= code && code <= 0x8ac) return "r";
+      else if (0x2000 <= code && code <= 0x200b) return "w";
+      else if (code == 0x200c) return "b";
+      else return "L";
+    }
+
+    var bidiRE = /[\u0590-\u05f4\u0600-\u06ff\u0700-\u08ac]/;
+    var isNeutral = /[stwN]/, isStrong = /[LRr]/, countsAsLeft = /[Lb1n]/, countsAsNum = /[1n]/;
+    // Browsers seem to always treat the boundaries of block elements as being L.
+    var outerType = "L";
+
+    function BidiSpan(level, from, to) {
+      this.level = level;
+      this.from = from; this.to = to;
+    }
+
+    return function(str) {
+      if (!bidiRE.test(str)) return false;
+      var len = str.length, types = [];
+      for (var i = 0, type; i < len; ++i)
+        types.push(type = charType(str.charCodeAt(i)));
+
+      // W1. Examine each non-spacing mark (NSM) in the level run, and
+      // change the type of the NSM to the type of the previous
+      // character. If the NSM is at the start of the level run, it will
+      // get the type of sor.
+      for (var i = 0, prev = outerType; i < len; ++i) {
+        var type = types[i];
+        if (type == "m") types[i] = prev;
+        else prev = type;
+      }
+
+      // W2. Search backwards from each instance of a European number
+      // until the first strong type (R, L, AL, or sor) is found. If an
+      // AL is found, change the type of the European number to Arabic
+      // number.
+      // W3. Change all ALs to R.
+      for (var i = 0, cur = outerType; i < len; ++i) {
+        var type = types[i];
+        if (type == "1" && cur == "r") types[i] = "n";
+        else if (isStrong.test(type)) { cur = type; if (type == "r") types[i] = "R"; }
+      }
+
+      // W4. A single European separator between two European numbers
+      // changes to a European number. A single common separator between
+      // two numbers of the same type changes to that type.
+      for (var i = 1, prev = types[0]; i < len - 1; ++i) {
+        var type = types[i];
+        if (type == "+" && prev == "1" && types[i+1] == "1") types[i] = "1";
+        else if (type == "," && prev == types[i+1] &&
+                 (prev == "1" || prev == "n")) types[i] = prev;
+        prev = type;
+      }
+
+      // W5. A sequence of European terminators adjacent to European
+      // numbers changes to all European numbers.
+      // W6. Otherwise, separators and terminators change to Other
+      // Neutral.
+      for (var i = 0; i < len; ++i) {
+        var type = types[i];
+        if (type == ",") types[i] = "N";
+        else if (type == "%") {
+          for (var end = i + 1; end < len && types[end] == "%"; ++end) {}
+          var replace = (i && types[i-1] == "!") || (end < len && types[end] == "1") ? "1" : "N";
+          for (var j = i; j < end; ++j) types[j] = replace;
+          i = end - 1;
+        }
+      }
+
+      // W7. Search backwards from each instance of a European number
+      // until the first strong type (R, L, or sor) is found. If an L is
+      // found, then change the type of the European number to L.
+      for (var i = 0, cur = outerType; i < len; ++i) {
+        var type = types[i];
+        if (cur == "L" && type == "1") types[i] = "L";
+        else if (isStrong.test(type)) cur = type;
+      }
+
+      // N1. A sequence of neutrals takes the direction of the
+      // surrounding strong text if the text on both sides has the same
+      // direction. European and Arabic numbers act as if they were R in
+      // terms of their influence on neutrals. Start-of-level-run (sor)
+      // and end-of-level-run (eor) are used at level run boundaries.
+      // N2. Any remaining neutrals take the embedding direction.
+      for (var i = 0; i < len; ++i) {
+        if (isNeutral.test(types[i])) {
+          for (var end = i + 1; end < len && isNeutral.test(types[end]); ++end) {}
+          var before = (i ? types[i-1] : outerType) == "L";
+          var after = (end < len ? types[end] : outerType) == "L";
+          var replace = before || after ? "L" : "R";
+          for (var j = i; j < end; ++j) types[j] = replace;
+          i = end - 1;
+        }
+      }
+
+      // Here we depart from the documented algorithm, in order to avoid
+      // building up an actual levels array. Since there are only three
+      // levels (0, 1, 2) in an implementation that doesn't take
+      // explicit embedding into account, we can build up the order on
+      // the fly, without following the level-based algorithm.
+      var order = [], m;
+      for (var i = 0; i < len;) {
+        if (countsAsLeft.test(types[i])) {
+          var start = i;
+          for (++i; i < len && countsAsLeft.test(types[i]); ++i) {}
+          order.push(new BidiSpan(0, start, i));
+        } else {
+          var pos = i, at = order.length;
+          for (++i; i < len && types[i] != "L"; ++i) {}
+          for (var j = pos; j < i;) {
+            if (countsAsNum.test(types[j])) {
+              if (pos < j) order.splice(at, 0, new BidiSpan(1, pos, j));
+              var nstart = j;
+              for (++j; j < i && countsAsNum.test(types[j]); ++j) {}
+              order.splice(at, 0, new BidiSpan(2, nstart, j));
+              pos = j;
+            } else ++j;
+          }
+          if (pos < i) order.splice(at, 0, new BidiSpan(1, pos, i));
+        }
+      }
+      if (order[0].level == 1 && (m = str.match(/^\s+/))) {
+        order[0].from = m[0].length;
+        order.unshift(new BidiSpan(0, 0, m[0].length));
+      }
+      if (lst(order).level == 1 && (m = str.match(/\s+$/))) {
+        lst(order).to -= m[0].length;
+        order.push(new BidiSpan(0, len - m[0].length, len));
+      }
+      if (order[0].level == 2)
+        order.unshift(new BidiSpan(1, order[0].to, order[0].to));
+      if (order[0].level != lst(order).level)
+        order.push(new BidiSpan(order[0].level, len, len));
+
+      return order;
+    };
+  })();
+
+  // THE END
+
+  CodeMirror.version = "5.6.0";
+
+  return CodeMirror;
+});
diff --git a/public/assets/codemirror/codemirror_python_ruby_c.js b/public/assets/codemirror/codemirror_python_ruby_c.js
new file mode 100644
index 000000000..cfc0eb6ee
--- /dev/null
+++ b/public/assets/codemirror/codemirror_python_ruby_c.js
@@ -0,0 +1,18 @@
+/* CodeMirror - Minified & Bundled
+   Generated on 2015/9/19 with http://codemirror.net/doc/compress.html
+   Version: HEAD
+
+   CodeMirror Library:
+   - codemirror.js
+   Modes:
+   - clike.js
+   - python.js
+   - ruby.js
+ */
+
+!function(a){if("object"==typeof exports&&"object"==typeof module)module.exports=a();else{if("function"==typeof define&&define.amd)return define([],a);this.CodeMirror=a()}}(function(){"use strict";function v(a,b){if(!(this instanceof v))return new v(a,b);this.options=b=b?hg(b):{},hg(Ad,b,!1),I(b);var c=b.value;"string"==typeof c&&(c=new af(c,b.mode,null,b.lineSeparator)),this.doc=c;var g=new v.inputStyles[b.inputStyle](this),h=this.display=new w(a,c,g);h.wrapper.CodeMirror=this,E(this),C(this),b.lineWrapping&&(this.display.wrapper.className+=" CodeMirror-wrap"),b.autofocus&&!n&&h.input.focus(),M(this),this.state={keyMaps:[],overlays:[],modeGen:0,overwrite:!1,delayingBlurEvent:!1,focused:!1,suppressEdits:!1,pasteIncoming:!1,cutIncoming:!1,selectingText:!1,draggingText:!1,highlight:new Yf,keySeq:null,specialChars:null};var i=this;d&&11>e&&setTimeout(function(){i.display.input.reset(!0)},20),pc(this),Bg(),Vb(this),this.curOp.forceUpdate=!0,ef(this,c),b.autofocus&&!n||i.hasFocus()?setTimeout(ig(Zc,this),20):$c(this);for(var j in Bd)Bd.hasOwnProperty(j)&&Bd[j](this,b[j],Dd);R(this),b.finishInit&&b.finishInit(this);for(var k=0;k<Hd.length;++k)Hd[k](this);Xb(this),f&&b.lineWrapping&&"optimizelegibility"==getComputedStyle(h.lineDiv).textRendering&&(h.lineDiv.style.textRendering="auto")}function w(b,c,g){var h=this;this.input=g,h.scrollbarFiller=pg("div",null,"CodeMirror-scrollbar-filler"),h.scrollbarFiller.setAttribute("cm-not-content","true"),h.gutterFiller=pg("div",null,"CodeMirror-gutter-filler"),h.gutterFiller.setAttribute("cm-not-content","true"),h.lineDiv=pg("div",null,"CodeMirror-code"),h.selectionDiv=pg("div",null,null,"position: relative; z-index: 1"),h.cursorDiv=pg("div",null,"CodeMirror-cursors"),h.measure=pg("div",null,"CodeMirror-measure"),h.lineMeasure=pg("div",null,"CodeMirror-measure"),h.lineSpace=pg("div",[h.measure,h.lineMeasure,h.selectionDiv,h.cursorDiv,h.lineDiv],null,"position: relative; outline: none"),h.mover=pg("div",[pg("div",[h.lineSpace],"CodeMirror-lines")],null,"position: relative"),h.sizer=pg("div",[h.mover],"CodeMirror-sizer"),h.sizerWidth=null,h.heightForcer=pg("div",null,null,"position: absolute; height: "+Tf+"px; width: 1px;"),h.gutters=pg("div",null,"CodeMirror-gutters"),h.lineGutter=null,h.scroller=pg("div",[h.sizer,h.heightForcer,h.gutters],"CodeMirror-scroll"),h.scroller.setAttribute("tabIndex","-1"),h.wrapper=pg("div",[h.scrollbarFiller,h.gutterFiller,h.scroller],"CodeMirror"),d&&8>e&&(h.gutters.style.zIndex=-1,h.scroller.style.paddingRight=0),f||a&&n||(h.scroller.draggable=!0),b&&(b.appendChild?b.appendChild(h.wrapper):b(h.wrapper)),h.viewFrom=h.viewTo=c.first,h.reportedViewFrom=h.reportedViewTo=c.first,h.view=[],h.renderedView=null,h.externalMeasured=null,h.viewOffset=0,h.lastWrapHeight=h.lastWrapWidth=0,h.updateLineNumbers=null,h.nativeBarWidth=h.barHeight=h.barWidth=0,h.scrollbarsClipped=!1,h.lineNumWidth=h.lineNumInnerWidth=h.lineNumChars=null,h.alignWidgets=!1,h.cachedCharWidth=h.cachedTextHeight=h.cachedPaddingH=null,h.maxLine=null,h.maxLineLength=0,h.maxLineChanged=!1,h.wheelDX=h.wheelDY=h.wheelStartX=h.wheelStartY=null,h.shift=!1,h.selForContextMenu=null,h.activeTouch=null,g.init(h)}function x(a){a.doc.mode=v.getMode(a.options,a.doc.modeOption),y(a)}function y(a){a.doc.iter(function(a){a.stateAfter&&(a.stateAfter=null),a.styles&&(a.styles=null)}),a.doc.frontier=a.doc.first,ib(a,100),a.state.modeGen++,a.curOp&&ic(a)}function z(a){a.options.lineWrapping?(xg(a.display.wrapper,"CodeMirror-wrap"),a.display.sizer.style.minWidth="",a.display.sizerWidth=null):(wg(a.display.wrapper,"CodeMirror-wrap"),H(a)),B(a),ic(a),Fb(a),setTimeout(function(){N(a)},100)}function A(a){var b=Rb(a.display),c=a.options.lineWrapping,d=c&&Math.max(5,a.display.scroller.clientWidth/Sb(a.display)-3);return function(e){if(we(a.doc,e))return 0;var f=0;if(e.widgets)for(var g=0;g<e.widgets.length;g++)e.widgets[g].height&&(f+=e.widgets[g].height);return c?f+(Math.ceil(e.text.length/d)||1)*b:f+b}}function B(a){var b=a.doc,c=A(a);b.iter(function(a){var b=c(a);b!=a.height&&jf(a,b)})}function C(a){a.display.wrapper.className=a.display.wrapper.className.replace(/\s*cm-s-\S+/g,"")+a.options.theme.replace(/(^|\s)\s*/g," cm-s-"),Fb(a)}function D(a){E(a),ic(a),setTimeout(function(){Q(a)},20)}function E(a){var b=a.display.gutters,c=a.options.gutters;rg(b);for(var d=0;d<c.length;++d){var e=c[d],f=b.appendChild(pg("div",null,"CodeMirror-gutter "+e));"CodeMirror-linenumbers"==e&&(a.display.lineGutter=f,f.style.width=(a.display.lineNumWidth||1)+"px")}b.style.display=d?"":"none",F(a)}function F(a){var b=a.display.gutters.offsetWidth;a.display.sizer.style.marginLeft=b+"px"}function G(a){if(0==a.height)return 0;for(var c,b=a.text.length,d=a;c=pe(d);){var e=c.find(0,!0);d=e.from.line,b+=e.from.ch-e.to.ch}for(d=a;c=qe(d);){var e=c.find(0,!0);b-=d.text.length-e.from.ch,d=e.to.line,b+=d.text.length-e.to.ch}return b}function H(a){var b=a.display,c=a.doc;b.maxLine=ff(c,c.first),b.maxLineLength=G(b.maxLine),b.maxLineChanged=!0,c.iter(function(a){var c=G(a);c>b.maxLineLength&&(b.maxLineLength=c,b.maxLine=a)})}function I(a){var b=dg(a.gutters,"CodeMirror-linenumbers");-1==b&&a.lineNumbers?a.gutters=a.gutters.concat(["CodeMirror-linenumbers"]):b>-1&&!a.lineNumbers&&(a.gutters=a.gutters.slice(0),a.gutters.splice(b,1))}function J(a){var b=a.display,c=b.gutters.offsetWidth,d=Math.round(a.doc.height+nb(a.display));return{clientHeight:b.scroller.clientHeight,viewHeight:b.wrapper.clientHeight,scrollWidth:b.scroller.scrollWidth,clientWidth:b.scroller.clientWidth,viewWidth:b.wrapper.clientWidth,barLeft:a.options.fixedGutter?c:0,docHeight:d,scrollHeight:d+pb(a)+b.barHeight,nativeBarWidth:b.nativeBarWidth,gutterWidth:c}}function K(a,b,c){this.cm=c;var f=this.vert=pg("div",[pg("div",null,null,"min-width: 1px")],"CodeMirror-vscrollbar"),g=this.horiz=pg("div",[pg("div",null,null,"height: 100%; min-height: 1px")],"CodeMirror-hscrollbar");a(f),a(g),Jf(f,"scroll",function(){f.clientHeight&&b(f.scrollTop,"vertical")}),Jf(g,"scroll",function(){g.clientWidth&&b(g.scrollLeft,"horizontal")}),this.checkedOverlay=!1,d&&8>e&&(this.horiz.style.minHeight=this.vert.style.minWidth="18px")}function L(){}function M(a){a.display.scrollbars&&(a.display.scrollbars.clear(),a.display.scrollbars.addClass&&wg(a.display.wrapper,a.display.scrollbars.addClass)),a.display.scrollbars=new v.scrollbarModel[a.options.scrollbarStyle](function(b){a.display.wrapper.insertBefore(b,a.display.scrollbarFiller),Jf(b,"mousedown",function(){a.state.focused&&setTimeout(function(){a.display.input.focus()},0)}),b.setAttribute("cm-not-content","true")},function(b,c){"horizontal"==c?Ic(a,b):Hc(a,b)},a),a.display.scrollbars.addClass&&xg(a.display.wrapper,a.display.scrollbars.addClass)}function N(a,b){b||(b=J(a));var c=a.display.barWidth,d=a.display.barHeight;O(a,b);for(var e=0;4>e&&c!=a.display.barWidth||d!=a.display.barHeight;e++)c!=a.display.barWidth&&a.options.lineWrapping&&$(a),O(a,J(a)),c=a.display.barWidth,d=a.display.barHeight}function O(a,b){var c=a.display,d=c.scrollbars.update(b);c.sizer.style.paddingRight=(c.barWidth=d.right)+"px",c.sizer.style.paddingBottom=(c.barHeight=d.bottom)+"px",d.right&&d.bottom?(c.scrollbarFiller.style.display="block",c.scrollbarFiller.style.height=d.bottom+"px",c.scrollbarFiller.style.width=d.right+"px"):c.scrollbarFiller.style.display="",d.bottom&&a.options.coverGutterNextToScrollbar&&a.options.fixedGutter?(c.gutterFiller.style.display="block",c.gutterFiller.style.height=d.bottom+"px",c.gutterFiller.style.width=b.gutterWidth+"px"):c.gutterFiller.style.display=""}function P(a,b,c){var d=c&&null!=c.top?Math.max(0,c.top):a.scroller.scrollTop;d=Math.floor(d-mb(a));var e=c&&null!=c.bottom?c.bottom:d+a.wrapper.clientHeight,f=lf(b,d),g=lf(b,e);if(c&&c.ensure){var h=c.ensure.from.line,i=c.ensure.to.line;f>h?(f=h,g=lf(b,mf(ff(b,h))+a.wrapper.clientHeight)):Math.min(i,b.lastLine())>=g&&(f=lf(b,mf(ff(b,i))-a.wrapper.clientHeight),g=i)}return{from:f,to:Math.max(g,f+1)}}function Q(a){var b=a.display,c=b.view;if(b.alignWidgets||b.gutters.firstChild&&a.options.fixedGutter){for(var d=T(b)-b.scroller.scrollLeft+a.doc.scrollLeft,e=b.gutters.offsetWidth,f=d+"px",g=0;g<c.length;g++)if(!c[g].hidden){a.options.fixedGutter&&c[g].gutter&&(c[g].gutter.style.left=f);var h=c[g].alignable;if(h)for(var i=0;i<h.length;i++)h[i].style.left=f}a.options.fixedGutter&&(b.gutters.style.left=d+e+"px")}}function R(a){if(!a.options.lineNumbers)return!1;var b=a.doc,c=S(a.options,b.first+b.size-1),d=a.display;if(c.length!=d.lineNumChars){var e=d.measure.appendChild(pg("div",[pg("div",c)],"CodeMirror-linenumber CodeMirror-gutter-elt")),f=e.firstChild.offsetWidth,g=e.offsetWidth-f;return d.lineGutter.style.width="",d.lineNumInnerWidth=Math.max(f,d.lineGutter.offsetWidth-g)+1,d.lineNumWidth=d.lineNumInnerWidth+g,d.lineNumChars=d.lineNumInnerWidth?c.length:-1,d.lineGutter.style.width=d.lineNumWidth+"px",F(a),!0}return!1}function S(a,b){return String(a.lineNumberFormatter(b+a.firstLineNumber))}function T(a){return a.scroller.getBoundingClientRect().left-a.sizer.getBoundingClientRect().left}function U(a,b,c){var d=a.display;this.viewport=b,this.visible=P(d,a.doc,b),this.editorIsHidden=!d.wrapper.offsetWidth,this.wrapperHeight=d.wrapper.clientHeight,this.wrapperWidth=d.wrapper.clientWidth,this.oldDisplayWidth=qb(a),this.force=c,this.dims=aa(a),this.events=[]}function V(a){var b=a.display;!b.scrollbarsClipped&&b.scroller.offsetWidth&&(b.nativeBarWidth=b.scroller.offsetWidth-b.scroller.clientWidth,b.heightForcer.style.height=pb(a)+"px",b.sizer.style.marginBottom=-b.nativeBarWidth+"px",b.sizer.style.borderRightWidth=pb(a)+"px",b.scrollbarsClipped=!0)}function W(a,b){var c=a.display,d=a.doc;if(b.editorIsHidden)return kc(a),!1;if(!b.force&&b.visible.from>=c.viewFrom&&b.visible.to<=c.viewTo&&(null==c.updateLineNumbers||c.updateLineNumbers>=c.viewTo)&&c.renderedView==c.view&&0==oc(a))return!1;R(a)&&(kc(a),b.dims=aa(a));var e=d.first+d.size,f=Math.max(b.visible.from-a.options.viewportMargin,d.first),g=Math.min(e,b.visible.to+a.options.viewportMargin);c.viewFrom<f&&f-c.viewFrom<20&&(f=Math.max(d.first,c.viewFrom)),c.viewTo>g&&c.viewTo-g<20&&(g=Math.min(e,c.viewTo)),u&&(f=ue(a.doc,f),g=ve(a.doc,g));var h=f!=c.viewFrom||g!=c.viewTo||c.lastWrapHeight!=b.wrapperHeight||c.lastWrapWidth!=b.wrapperWidth;nc(a,f,g),c.viewOffset=mf(ff(a.doc,c.viewFrom)),a.display.mover.style.top=c.viewOffset+"px";var i=oc(a);if(!h&&0==i&&!b.force&&c.renderedView==c.view&&(null==c.updateLineNumbers||c.updateLineNumbers>=c.viewTo))return!1;var j=ug();return i>4&&(c.lineDiv.style.display="none"),ba(a,c.updateLineNumbers,b.dims),i>4&&(c.lineDiv.style.display=""),c.renderedView=c.view,j&&ug()!=j&&j.offsetHeight&&j.focus(),rg(c.cursorDiv),rg(c.selectionDiv),c.gutters.style.height=c.sizer.style.minHeight=0,h&&(c.lastWrapHeight=b.wrapperHeight,c.lastWrapWidth=b.wrapperWidth,ib(a,400)),c.updateLineNumbers=null,!0}function X(a,b){for(var c=b.viewport,d=!0;(d&&a.options.lineWrapping&&b.oldDisplayWidth!=qb(a)||(c&&null!=c.top&&(c={top:Math.min(a.doc.height+nb(a.display)-rb(a),c.top)}),b.visible=P(a.display,a.doc,c),!(b.visible.from>=a.display.viewFrom&&b.visible.to<=a.display.viewTo)))&&W(a,b);d=!1){$(a);var e=J(a);db(a),Z(a,e),N(a,e)}b.signal(a,"update",a),(a.display.viewFrom!=a.display.reportedViewFrom||a.display.viewTo!=a.display.reportedViewTo)&&(b.signal(a,"viewportChange",a,a.display.viewFrom,a.display.viewTo),a.display.reportedViewFrom=a.display.viewFrom,a.display.reportedViewTo=a.display.viewTo)}function Y(a,b){var c=new U(a,b);if(W(a,c)){$(a),X(a,c);var d=J(a);db(a),Z(a,d),N(a,d),c.finish()}}function Z(a,b){a.display.sizer.style.minHeight=b.docHeight+"px";var c=b.docHeight+a.display.barHeight;a.display.heightForcer.style.top=c+"px",a.display.gutters.style.height=Math.max(c+pb(a),b.clientHeight)+"px"}function $(a){for(var b=a.display,c=b.lineDiv.offsetTop,f=0;f<b.view.length;f++){var h,g=b.view[f];if(!g.hidden){if(d&&8>e){var i=g.node.offsetTop+g.node.offsetHeight;h=i-c,c=i}else{var j=g.node.getBoundingClientRect();h=j.bottom-j.top}var k=g.line.height-h;if(2>h&&(h=Rb(b)),(k>.001||-.001>k)&&(jf(g.line,h),_(g.line),g.rest))for(var l=0;l<g.rest.length;l++)_(g.rest[l])}}}function _(a){if(a.widgets)for(var b=0;b<a.widgets.length;++b)a.widgets[b].height=a.widgets[b].node.offsetHeight}function aa(a){for(var b=a.display,c={},d={},e=b.gutters.clientLeft,f=b.gutters.firstChild,g=0;f;f=f.nextSibling,++g)c[a.options.gutters[g]]=f.offsetLeft+f.clientLeft+e,d[a.options.gutters[g]]=f.clientWidth;return{fixedPos:T(b),gutterTotalWidth:b.gutters.offsetWidth,gutterLeft:c,gutterWidth:d,wrapperWidth:b.wrapper.clientWidth}}function ba(a,b,c){function i(b){var c=b.nextSibling;return f&&o&&a.display.currentWheelTarget==b?b.style.display="none":b.parentNode.removeChild(b),c}for(var d=a.display,e=a.options.lineNumbers,g=d.lineDiv,h=g.firstChild,j=d.view,k=d.viewFrom,l=0;l<j.length;l++){var m=j[l];if(m.hidden);else if(m.node&&m.node.parentNode==g){for(;h!=m.node;)h=i(h);var p=e&&null!=b&&k>=b&&m.lineNumber;m.changes&&(dg(m.changes,"gutter")>-1&&(p=!1),ca(a,m,k,c)),p&&(rg(m.lineNumber),m.lineNumber.appendChild(document.createTextNode(S(a.options,k)))),h=m.node.nextSibling}else{var n=ka(a,m,k,c);g.insertBefore(n,h)}k+=m.size}for(;h;)h=i(h)}function ca(a,b,c,d){for(var e=0;e<b.changes.length;e++){var f=b.changes[e];"text"==f?ga(a,b):"gutter"==f?ia(a,b,c,d):"class"==f?ha(b):"widget"==f&&ja(a,b,d)}b.changes=null}function da(a){return a.node==a.text&&(a.node=pg("div",null,null,"position: relative"),a.text.parentNode&&a.text.parentNode.replaceChild(a.node,a.text),a.node.appendChild(a.text),d&&8>e&&(a.node.style.zIndex=2)),a.node}function ea(a){var b=a.bgClass?a.bgClass+" "+(a.line.bgClass||""):a.line.bgClass;if(b&&(b+=" CodeMirror-linebackground"),a.background)b?a.background.className=b:(a.background.parentNode.removeChild(a.background),a.background=null);else if(b){var c=da(a);a.background=c.insertBefore(pg("div",null,b),c.firstChild)}}function fa(a,b){var c=a.display.externalMeasured;return c&&c.line==b.line?(a.display.externalMeasured=null,b.measure=c.measure,c.built):Qe(a,b)}function ga(a,b){var c=b.text.className,d=fa(a,b);b.text==b.node&&(b.node=d.pre),b.text.parentNode.replaceChild(d.pre,b.text),b.text=d.pre,d.bgClass!=b.bgClass||d.textClass!=b.textClass?(b.bgClass=d.bgClass,b.textClass=d.textClass,ha(b)):c&&(b.text.className=c)}function ha(a){ea(a),a.line.wrapClass?da(a).className=a.line.wrapClass:a.node!=a.text&&(a.node.className="");var b=a.textClass?a.textClass+" "+(a.line.textClass||""):a.line.textClass;a.text.className=b||""}function ia(a,b,c,d){if(b.gutter&&(b.node.removeChild(b.gutter),b.gutter=null),b.gutterBackground&&(b.node.removeChild(b.gutterBackground),b.gutterBackground=null),b.line.gutterClass){var e=da(b);b.gutterBackground=pg("div",null,"CodeMirror-gutter-background "+b.line.gutterClass,"left: "+(a.options.fixedGutter?d.fixedPos:-d.gutterTotalWidth)+"px; width: "+d.gutterTotalWidth+"px"),e.insertBefore(b.gutterBackground,b.text)}var f=b.line.gutterMarkers;if(a.options.lineNumbers||f){var e=da(b),g=b.gutter=pg("div",null,"CodeMirror-gutter-wrapper","left: "+(a.options.fixedGutter?d.fixedPos:-d.gutterTotalWidth)+"px");if(a.display.input.setUneditable(g),e.insertBefore(g,b.text),b.line.gutterClass&&(g.className+=" "+b.line.gutterClass),!a.options.lineNumbers||f&&f["CodeMirror-linenumbers"]||(b.lineNumber=g.appendChild(pg("div",S(a.options,c),"CodeMirror-linenumber CodeMirror-gutter-elt","left: "+d.gutterLeft["CodeMirror-linenumbers"]+"px; width: "+a.display.lineNumInnerWidth+"px"))),f)for(var h=0;h<a.options.gutters.length;++h){var i=a.options.gutters[h],j=f.hasOwnProperty(i)&&f[i];j&&g.appendChild(pg("div",[j],"CodeMirror-gutter-elt","left: "+d.gutterLeft[i]+"px; width: "+d.gutterWidth[i]+"px"))}}}function ja(a,b,c){b.alignable&&(b.alignable=null);for(var e,d=b.node.firstChild;d;d=e){var e=d.nextSibling;"CodeMirror-linewidget"==d.className&&b.node.removeChild(d)}la(a,b,c)}function ka(a,b,c,d){var e=fa(a,b);return b.text=b.node=e.pre,e.bgClass&&(b.bgClass=e.bgClass),e.textClass&&(b.textClass=e.textClass),ha(b),ia(a,b,c,d),la(a,b,d),b.node}function la(a,b,c){if(ma(a,b.line,b,c,!0),b.rest)for(var d=0;d<b.rest.length;d++)ma(a,b.rest[d],b,c,!1)}function ma(a,b,c,d,e){if(b.widgets)for(var f=da(c),g=0,h=b.widgets;g<h.length;++g){var i=h[g],j=pg("div",[i.node],"CodeMirror-linewidget");i.handleMouseEvents||j.setAttribute("cm-ignore-events","true"),na(i,j,c,d),a.display.input.setUneditable(j),e&&i.above?f.insertBefore(j,c.gutter||c.text):f.appendChild(j),Nf(i,"redraw")}}function na(a,b,c,d){if(a.noHScroll){(c.alignable||(c.alignable=[])).push(b);var e=d.wrapperWidth;b.style.left=d.fixedPos+"px",a.coverGutter||(e-=d.gutterTotalWidth,b.style.paddingLeft=d.gutterTotalWidth+"px"),b.style.width=e+"px"}a.coverGutter&&(b.style.zIndex=5,b.style.position="relative",a.noHScroll||(b.style.marginLeft=-d.gutterTotalWidth+"px"))}function qa(a){return oa(a.line,a.ch)}function ra(a,b){return pa(a,b)<0?b:a}function sa(a,b){return pa(a,b)<0?a:b}function ta(a){a.state.focused||(a.display.input.focus(),Zc(a))}function ua(a){return a.options.readOnly||a.doc.cantEdit}function wa(a,b,c,d,e){var f=a.doc;a.display.shift=!1,d||(d=f.sel);var g=a.state.pasteIncoming||"paste"==e,h=f.splitLines(b),i=null;if(g&&d.ranges.length>1)if(va&&va.join("\n")==b){if(d.ranges.length%va.length==0){i=[];for(var j=0;j<va.length;j++)i.push(f.splitLines(va[j]))}}else h.length==d.ranges.length&&(i=eg(h,function(a){return[a]}));for(var j=d.ranges.length-1;j>=0;j--){var k=d.ranges[j],l=k.from(),m=k.to();k.empty()&&(c&&c>0?l=oa(l.line,l.ch-c):a.state.overwrite&&!g&&(m=oa(m.line,Math.min(ff(f,m.line).text.length,m.ch+bg(h).length))));var n=a.curOp.updateInput,o={from:l,to:m,text:i?i[j%i.length]:h,origin:e||(g?"paste":a.state.cutIncoming?"cut":"+input")};hd(a.doc,o),Nf(a,"inputRead",a,o)}b&&!g&&ya(a,b),td(a),a.curOp.updateInput=n,a.curOp.typing=!0,a.state.pasteIncoming=a.state.cutIncoming=!1}function xa(a,b){var 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Aa(a){a.setAttribute("autocorrect","off"),a.setAttribute("autocapitalize","off"),a.setAttribute("spellcheck","false")}function Ba(a){this.cm=a,this.prevInput="",this.pollingFast=!1,this.polling=new Yf,this.inaccurateSelection=!1,this.hasSelection=!1,this.composing=null}function Ca(){var a=pg("textarea",null,null,"position: absolute; padding: 0; width: 1px; height: 1em; outline: none"),b=pg("div",[a],null,"overflow: hidden; position: relative; width: 3px; height: 0px;");return f?a.style.width="1000px":a.setAttribute("wrap","off"),m&&(a.style.border="1px solid black"),Aa(a),b}function Da(a){this.cm=a,this.lastAnchorNode=this.lastAnchorOffset=this.lastFocusNode=this.lastFocusOffset=null,this.polling=new Yf,this.gracePeriod=!1}function Ea(a,b){var c=wb(a,b.line);if(!c||c.hidden)return null;var d=ff(a.doc,b.line),e=tb(c,d,b.line),f=nf(d),g="left";if(f){var h=Yg(f,b.ch);g=h%2?"right":"left"}var i=Ab(e.map,b.ch,g);return i.offset="right"==i.collapse?i.end:i.start,i}function Fa(a,b){return 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Cb(a,b){if(!window.screen||null==screen.logicalXDPI||screen.logicalXDPI==screen.deviceXDPI||!Mg(a))return b;var c=screen.logicalXDPI/screen.deviceXDPI,d=screen.logicalYDPI/screen.deviceYDPI;return{left:b.left*c,right:b.right*c,top:b.top*d,bottom:b.bottom*d}}function Db(a){if(a.measure&&(a.measure.cache={},a.measure.heights=null,a.rest))for(var b=0;b<a.rest.length;b++)a.measure.caches[b]={}}function Eb(a){a.display.externalMeasure=null,rg(a.display.lineMeasure);for(var b=0;b<a.display.view.length;b++)Db(a.display.view[b])}function Fb(a){Eb(a),a.display.cachedCharWidth=a.display.cachedTextHeight=a.display.cachedPaddingH=null,a.options.lineWrapping||(a.display.maxLineChanged=!0),a.display.lineNumChars=null}function Gb(){return window.pageXOffset||(document.documentElement||document.body).scrollLeft}function Hb(){return window.pageYOffset||(document.documentElement||document.body).scrollTop}function Ib(a,b,c,d){if(b.widgets)for(var e=0;e<b.widgets.length;++e)if(b.widgets[e].above){var f=Ae(b.widgets[e]);c.top+=f,c.bottom+=f}if("line"==d)return c;d||(d="local");var g=mf(b);if("local"==d?g+=mb(a.display):g-=a.display.viewOffset,"page"==d||"window"==d){var h=a.display.lineSpace.getBoundingClientRect();g+=h.top+("window"==d?0:Hb());var i=h.left+("window"==d?0:Gb());c.left+=i,c.right+=i}return c.top+=g,c.bottom+=g,c}function Jb(a,b,c){if("div"==c)return b;var d=b.left,e=b.top;if("page"==c)d-=Gb(),e-=Hb();else if("local"==c||!c){var f=a.display.sizer.getBoundingClientRect();d+=f.left,e+=f.top}var g=a.display.lineSpace.getBoundingClientRect();return{left:d-g.left,top:e-g.top}}function Kb(a,b,c,d,e){return d||(d=ff(a.doc,b.line)),Ib(a,d,vb(a,d,b.ch,e),c)}function Lb(a,b,c,d,e,f){function g(b,g){var h=yb(a,e,b,g?"right":"left",f);return g?h.left=h.right:h.right=h.left,Ib(a,d,h,c)}function h(a,b){var c=i[b],d=c.level%2;return a==Pg(c)&&b&&c.level<i[b-1].level?(c=i[--b],a=Qg(c)-(c.level%2?0:1),d=!0):a==Qg(c)&&b<i.length-1&&c.level<i[b+1].level&&(c=i[++b],a=Pg(c)-c.level%2,d=!1),d&&a==c.to&&a>c.from?g(a-1):g(a,d)}d=d||ff(a.doc,b.line),e||(e=xb(a,d));var i=nf(d),j=b.ch;if(!i)return g(j);var k=Yg(i,j),l=h(j,k);return null!=Xg&&(l.other=h(j,Xg)),l}function Mb(a,b){var c=0,b=Oa(a.doc,b);a.options.lineWrapping||(c=Sb(a.display)*b.ch);var d=ff(a.doc,b.line),e=mf(d)+mb(a.display);return{left:c,right:c,top:e,bottom:e+d.height}}function Nb(a,b,c,d){var e=oa(a,b);return e.xRel=d,c&&(e.outside=!0),e}function Ob(a,b,c){var d=a.doc;if(c+=a.display.viewOffset,0>c)return Nb(d.first,0,!0,-1);var e=lf(d,c),f=d.first+d.size-1;if(e>f)return Nb(d.first+d.size-1,ff(d,f).text.length,!0,1);0>b&&(b=0);for(var g=ff(d,e);;){var h=Pb(a,g,e,b,c),i=qe(g),j=i&&i.find(0,!0);if(!i||!(h.ch>j.from.ch||h.ch==j.from.ch&&h.xRel>0))return h;e=kf(g=j.to.line)}}function Pb(a,b,c,d,e){function j(d){var e=Lb(a,oa(c,d),"line",b,i);return g=!0,f>e.bottom?e.left-h:f<e.top?e.left+h:(g=!1,e.left)}var f=e-mf(b),g=!1,h=2*a.display.wrapper.clientWidth,i=xb(a,b),k=nf(b),l=b.text.length,m=Rg(b),n=Sg(b),o=j(m),p=g,q=j(n),r=g;if(d>q)return Nb(c,n,r,1);for(;;){if(k?n==m||n==$g(b,m,1):1>=n-m){for(var s=o>d||q-d>=d-o?m:n,t=d-(s==m?o:q);og(b.text.charAt(s));)++s;var u=Nb(c,s,s==m?p:r,-1>t?-1:t>1?1:0);return u}var v=Math.ceil(l/2),w=m+v;if(k){w=m;for(var x=0;v>x;++x)w=$g(b,w,1)}var y=j(w);y>d?(n=w,q=y,(r=g)&&(q+=1e3),l=v):(m=w,o=y,p=g,l-=v)}}function Rb(a){if(null!=a.cachedTextHeight)return a.cachedTextHeight;if(null==Qb){Qb=pg("pre");for(var b=0;49>b;++b)Qb.appendChild(document.createTextNode("x")),Qb.appendChild(pg("br"));Qb.appendChild(document.createTextNode("x"))}sg(a.measure,Qb);var c=Qb.offsetHeight/50;return c>3&&(a.cachedTextHeight=c),rg(a.measure),c||1}function Sb(a){if(null!=a.cachedCharWidth)return a.cachedCharWidth;var b=pg("span","xxxxxxxxxx"),c=pg("pre",[b]);sg(a.measure,c);var d=b.getBoundingClientRect(),e=(d.right-d.left)/10;return e>2&&(a.cachedCharWidth=e),e||10}function Vb(a){a.curOp={cm:a,viewChanged:!1,startHeight:a.doc.height,forceUpdate:!1,updateInput:null,typing:!1,changeObjs:null,cursorActivityHandlers:null,cursorActivityCalled:0,selectionChanged:!1,updateMaxLine:!1,scrollLeft:null,scrollTop:null,scrollToPos:null,focus:!1,id:++Ub},Tb?Tb.ops.push(a.curOp):a.curOp.ownsGroup=Tb={ops:[a.curOp],delayedCallbacks:[]}}function Wb(a){var b=a.delayedCallbacks,c=0;do{for(;c<b.length;c++)b[c].call(null);for(var d=0;d<a.ops.length;d++){var e=a.ops[d];if(e.cursorActivityHandlers)for(;e.cursorActivityCalled<e.cursorActivityHandlers.length;)e.cursorActivityHandlers[e.cursorActivityCalled++].call(null,e.cm)}}while(c<b.length)}function Xb(a){var b=a.curOp,c=b.ownsGroup;if(c)try{Wb(c)}finally{Tb=null;for(var d=0;d<c.ops.length;d++)c.ops[d].cm.curOp=null;Yb(c)}}function Yb(a){for(var b=a.ops,c=0;c<b.length;c++)Zb(b[c]);for(var c=0;c<b.length;c++)$b(b[c]);for(var c=0;c<b.length;c++)_b(b[c]);for(var c=0;c<b.length;c++)ac(b[c]);for(var c=0;c<b.length;c++)bc(b[c])}function Zb(a){var b=a.cm,c=b.display;V(b),a.updateMaxLine&&H(b),a.mustUpdate=a.viewChanged||a.forceUpdate||null!=a.scrollTop||a.scrollToPos&&(a.scrollToPos.from.line<c.viewFrom||a.scrollToPos.to.line>=c.viewTo)||c.maxLineChanged&&b.options.lineWrapping,a.update=a.mustUpdate&&new U(b,a.mustUpdate&&{top:a.scrollTop,ensure:a.scrollToPos},a.forceUpdate)}function $b(a){a.updatedDisplay=a.mustUpdate&&W(a.cm,a.update)}function _b(a){var b=a.cm,c=b.display;a.updatedDisplay&&$(b),a.barMeasure=J(b),c.maxLineChanged&&!b.options.lineWrapping&&(a.adjustWidthTo=vb(b,c.maxLine,c.maxLine.text.length).left+3,b.display.sizerWidth=a.adjustWidthTo,a.barMeasure.scrollWidth=Math.max(c.scroller.clientWidth,c.sizer.offsetLeft+a.adjustWidthTo+pb(b)+b.display.barWidth),a.maxScrollLeft=Math.max(0,c.sizer.offsetLeft+a.adjustWidthTo-qb(b))),(a.updatedDisplay||a.selectionChanged)&&(a.preparedSelection=c.input.prepareSelection())}function ac(a){var b=a.cm;null!=a.adjustWidthTo&&(b.display.sizer.style.minWidth=a.adjustWidthTo+"px",a.maxScrollLeft<b.doc.scrollLeft&&Ic(b,Math.min(b.display.scroller.scrollLeft,a.maxScrollLeft),!0),b.display.maxLineChanged=!1),a.preparedSelection&&b.display.input.showSelection(a.preparedSelection),a.updatedDisplay&&Z(b,a.barMeasure),(a.updatedDisplay||a.startHeight!=b.doc.height)&&N(b,a.barMeasure),a.selectionChanged&&hb(b),b.state.focused&&a.updateInput&&b.display.input.reset(a.typing),a.focus&&a.focus==ug()&&ta(a.cm)}function bc(a){var b=a.cm,c=b.display,d=b.doc;if(a.updatedDisplay&&X(b,a.update),null==c.wheelStartX||null==a.scrollTop&&null==a.scrollLeft&&!a.scrollToPos||(c.wheelStartX=c.wheelStartY=null),null==a.scrollTop||c.scroller.scrollTop==a.scrollTop&&!a.forceScroll||(d.scrollTop=Math.max(0,Math.min(c.scroller.scrollHeight-c.scroller.clientHeight,a.scrollTop)),c.scrollbars.setScrollTop(d.scrollTop),c.scroller.scrollTop=d.scrollTop),null==a.scrollLeft||c.scroller.scrollLeft==a.scrollLeft&&!a.forceScroll||(d.scrollLeft=Math.max(0,Math.min(c.scroller.scrollWidth-qb(b),a.scrollLeft)),c.scrollbars.setScrollLeft(d.scrollLeft),c.scroller.scrollLeft=d.scrollLeft,Q(b)),a.scrollToPos){var e=pd(b,Oa(d,a.scrollToPos.from),Oa(d,a.scrollToPos.to),a.scrollToPos.margin);a.scrollToPos.isCursor&&b.state.focused&&od(b,e)}var f=a.maybeHiddenMarkers,g=a.maybeUnhiddenMarkers;if(f)for(var h=0;h<f.length;++h)f[h].lines.length||Lf(f[h],"hide");if(g)for(var h=0;h<g.length;++h)g[h].lines.length&&Lf(g[h],"unhide");c.wrapper.offsetHeight&&(d.scrollTop=b.display.scroller.scrollTop),a.changeObjs&&Lf(b,"changes",b,a.changeObjs),a.update&&a.update.finish()}function cc(a,b){if(a.curOp)return b();Vb(a);try{return b()}finally{Xb(a)}}function dc(a,b){return function(){if(a.curOp)return b.apply(a,arguments);Vb(a);try{return b.apply(a,arguments)}finally{Xb(a)}}}function ec(a){return function(){if(this.curOp)return a.apply(this,arguments);Vb(this);try{return a.apply(this,arguments)}finally{Xb(this)}}}function fc(a){return function(){var b=this.cm;if(!b||b.curOp)return a.apply(this,arguments);Vb(b);try{return a.apply(this,arguments)}finally{Xb(b)}}}function gc(a,b,c){this.line=b,this.rest=te(b),this.size=this.rest?kf(bg(this.rest))-c+1:1,this.node=this.text=null,this.hidden=we(a,b)}function hc(a,b,c){for(var e,d=[],f=b;c>f;f=e){var g=new gc(a.doc,ff(a.doc,f),f);e=f+g.size,d.push(g)}return d}function ic(a,b,c,d){null==b&&(b=a.doc.first),null==c&&(c=a.doc.first+a.doc.size),d||(d=0);var e=a.display;if(d&&c<e.viewTo&&(null==e.updateLineNumbers||e.updateLineNumbers>b)&&(e.updateLineNumbers=b),a.curOp.viewChanged=!0,b>=e.viewTo)u&&ue(a.doc,b)<e.viewTo&&kc(a);else if(c<=e.viewFrom)u&&ve(a.doc,c+d)>e.viewFrom?kc(a):(e.viewFrom+=d,e.viewTo+=d);else if(b<=e.viewFrom&&c>=e.viewTo)kc(a);else if(b<=e.viewFrom){var f=mc(a,c,c+d,1);f?(e.view=e.view.slice(f.index),e.viewFrom=f.lineN,e.viewTo+=d):kc(a)}else if(c>=e.viewTo){var f=mc(a,b,b,-1);f?(e.view=e.view.slice(0,f.index),e.viewTo=f.lineN):kc(a)}else{var g=mc(a,b,b,-1),h=mc(a,c,c+d,1);g&&h?(e.view=e.view.slice(0,g.index).concat(hc(a,g.lineN,h.lineN)).concat(e.view.slice(h.index)),e.viewTo+=d):kc(a)}var i=e.externalMeasured;i&&(c<i.lineN?i.lineN+=d:b<i.lineN+i.size&&(e.externalMeasured=null))}function jc(a,b,c){a.curOp.viewChanged=!0;var d=a.display,e=a.display.externalMeasured;if(e&&b>=e.lineN&&b<e.lineN+e.size&&(d.externalMeasured=null),!(b<d.viewFrom||b>=d.viewTo)){var f=d.view[lc(a,b)];if(null!=f.node){var g=f.changes||(f.changes=[]);-1==dg(g,c)&&g.push(c)}}}function kc(a){a.display.viewFrom=a.display.viewTo=a.doc.first,a.display.view=[],a.display.viewOffset=0}function lc(a,b){if(b>=a.display.viewTo)return null;if(b-=a.display.viewFrom,0>b)return null;for(var c=a.display.view,d=0;d<c.length;d++)if(b-=c[d].size,0>b)return d}function mc(a,b,c,d){var f,e=lc(a,b),g=a.display.view;if(!u||c==a.doc.first+a.doc.size)return{index:e,lineN:c};for(var h=0,i=a.display.viewFrom;e>h;h++)i+=g[h].size;if(i!=b){if(d>0){if(e==g.length-1)return null;f=i+g[e].size-b,e++}else f=i-b;b+=f,c+=f}for(;ue(a.doc,c)!=c;){if(e==(0>d?0:g.length-1))return null;c+=d*g[e-(0>d?1:0)].size,e+=d}return{index:e,lineN:c}}function nc(a,b,c){var d=a.display,e=d.view;0==e.length||b>=d.viewTo||c<=d.viewFrom?(d.view=hc(a,b,c),d.viewFrom=b):(d.viewFrom>b?d.view=hc(a,b,d.viewFrom).concat(d.view):d.viewFrom<b&&(d.view=d.view.slice(lc(a,b))),d.viewFrom=b,d.viewTo<c?d.view=d.view.concat(hc(a,d.viewTo,c)):d.viewTo>c&&(d.view=d.view.slice(0,lc(a,c)))),d.viewTo=c}function oc(a){for(var b=a.display.view,c=0,d=0;d<b.length;d++){var e=b[d];e.hidden||e.node&&!e.changes||++c}return c}function pc(a){function g(){b.activeTouch&&(c=setTimeout(function(){b.activeTouch=null},1e3),f=b.activeTouch,f.end=+new Date)}function h(a){if(1!=a.touches.length)return!1;var b=a.touches[0];return b.radiusX<=1&&b.radiusY<=1}function i(a,b){if(null==b.left)return!0;var c=b.left-a.left,d=b.top-a.top;return c*c+d*d>400}var b=a.display;Jf(b.scroller,"mousedown",dc(a,uc)),d&&11>e?Jf(b.scroller,"dblclick",dc(a,function(b){if(!Pf(a,b)){var c=tc(a,b);if(c&&!Bc(a,b)&&!sc(a.display,b)){Df(b);var d=a.findWordAt(c);Ta(a.doc,d.anchor,d.head)}}})):Jf(b.scroller,"dblclick",function(b){Pf(a,b)||Df(b)}),s||Jf(b.scroller,"contextmenu",function(b){_c(a,b)});var c,f={end:0};Jf(b.scroller,"touchstart",function(a){if(!h(a)){clearTimeout(c);var d=+new Date;b.activeTouch={start:d,moved:!1,prev:d-f.end<=300?f:null},1==a.touches.length&&(b.activeTouch.left=a.touches[0].pageX,b.activeTouch.top=a.touches[0].pageY)}}),Jf(b.scroller,"touchmove",function(){b.activeTouch&&(b.activeTouch.moved=!0)}),Jf(b.scroller,"touchend",function(c){var d=b.activeTouch;if(d&&!sc(b,c)&&null!=d.left&&!d.moved&&new Date-d.start<300){var f,e=a.coordsChar(b.activeTouch,"page");f=!d.prev||i(d,d.prev)?new Ka(e,e):!d.prev.prev||i(d,d.prev.prev)?a.findWordAt(e):new Ka(oa(e.line,0),Oa(a.doc,oa(e.line+1,0))),a.setSelection(f.anchor,f.head),a.focus(),Df(c)}g()}),Jf(b.scroller,"touchcancel",g),Jf(b.scroller,"scroll",function(){b.scroller.clientHeight&&(Hc(a,b.scroller.scrollTop),Ic(a,b.scroller.scrollLeft,!0),Lf(a,"scroll",a))}),Jf(b.scroller,"mousewheel",function(b){Mc(a,b)}),Jf(b.scroller,"DOMMouseScroll",function(b){Mc(a,b)}),Jf(b.wrapper,"scroll",function(){b.wrapper.scrollTop=b.wrapper.scrollLeft=0}),b.dragFunctions={enter:function(b){Pf(a,b)||Gf(b)},over:function(b){Pf(a,b)||(Fc(a,b),Gf(b))},start:function(b){Ec(a,b)},drop:dc(a,Dc),leave:function(){Gc(a)}};var j=b.input.getField();Jf(j,"keyup",function(b){Wc.call(a,b)}),Jf(j,"keydown",dc(a,Uc)),Jf(j,"keypress",dc(a,Xc)),Jf(j,"focus",ig(Zc,a)),Jf(j,"blur",ig($c,a))}function qc(a,b,c){var d=c&&c!=v.Init;if(!b!=!d){var e=a.display.dragFunctions,f=b?Jf:Kf;f(a.display.scroller,"dragstart",e.start),f(a.display.scroller,"dragenter",e.enter),f(a.display.scroller,"dragover",e.over),f(a.display.scroller,"dragleave",e.leave),f(a.display.scroller,"drop",e.drop)}}function rc(a){var b=a.display;(b.lastWrapHeight!=b.wrapper.clientHeight||b.lastWrapWidth!=b.wrapper.clientWidth)&&(b.cachedCharWidth=b.cachedTextHeight=b.cachedPaddingH=null,b.scrollbarsClipped=!1,a.setSize())}function sc(a,b){for(var c=Hf(b);c!=a.wrapper;c=c.parentNode)if(!c||1==c.nodeType&&"true"==c.getAttribute("cm-ignore-events")||c.parentNode==a.sizer&&c!=a.mover)return!0}function tc(a,b,c,d){var e=a.display;if(!c&&"true"==Hf(b).getAttribute("cm-not-content"))return null;var f,g,h=e.lineSpace.getBoundingClientRect();try{f=b.clientX-h.left,g=b.clientY-h.top}catch(b){return null}var j,i=Ob(a,f,g);if(d&&1==i.xRel&&(j=ff(a.doc,i.line).text).length==i.ch){var k=Zf(j,j.length,a.options.tabSize)-j.length;i=oa(i.line,Math.max(0,Math.round((f-ob(a.display).left)/Sb(a.display))-k))}return i}function uc(a){var b=this,c=b.display;if(!(c.activeTouch&&c.input.supportsTouch()||Pf(b,a))){if(c.shift=a.shiftKey,sc(c,a))return void(f||(c.scroller.draggable=!1,setTimeout(function(){c.scroller.draggable=!0},100)));if(!Bc(b,a)){var d=tc(b,a);switch(window.focus(),If(a)){case 1:b.state.selectingText?b.state.selectingText(a):d?xc(b,a,d):Hf(a)==c.scroller&&Df(a);break;case 2:f&&(b.state.lastMiddleDown=+new Date),d&&Ta(b.doc,d),setTimeout(function(){c.input.focus()},20),Df(a);break;case 3:s?_c(b,a):Yc(b)}}}}function xc(a,b,c){d?setTimeout(ig(ta,a),0):a.curOp.focus=ug();var f,e=+new Date;wc&&wc.time>e-400&&0==pa(wc.pos,c)?f="triple":vc&&vc.time>e-400&&0==pa(vc.pos,c)?(f="double",wc={time:e,pos:c}):(f="single",vc={time:e,pos:c});var i,g=a.doc.sel,h=o?b.metaKey:b.ctrlKey;a.options.dragDrop&&Dg&&!ua(a)&&"single"==f&&(i=g.contains(c))>-1&&(pa((i=g.ranges[i]).from(),c)<0||c.xRel>0)&&(pa(i.to(),c)>0||c.xRel<0)?yc(a,b,c,h):zc(a,b,c,f,h)}function yc(a,b,c,g){var h=a.display,i=+new Date,j=dc(a,function(k){f&&(h.scroller.draggable=!1),a.state.draggingText=!1,Kf(document,"mouseup",j),Kf(h.scroller,"drop",j),Math.abs(b.clientX-k.clientX)+Math.abs(b.clientY-k.clientY)<10&&(Df(k),!g&&+new Date-200<i&&Ta(a.doc,c),f||d&&9==e?setTimeout(function(){document.body.focus(),h.input.focus()},20):h.input.focus())});f&&(h.scroller.draggable=!0),a.state.draggingText=j,h.scroller.dragDrop&&h.scroller.dragDrop(),Jf(document,"mouseup",j),Jf(h.scroller,"drop",j)}function zc(a,b,c,d,e){function o(b){if(0!=pa(n,b))if(n=b,"rect"==d){for(var e=[],f=a.options.tabSize,k=Zf(ff(g,c.line).text,c.ch,f),l=Zf(ff(g,b.line).text,b.ch,f),m=Math.min(k,l),o=Math.max(k,l),p=Math.min(c.line,b.line),q=Math.min(a.lastLine(),Math.max(c.line,b.line));q>=p;p++){var r=ff(g,p).text,s=$f(r,m,f);m==o?e.push(new Ka(oa(p,s),oa(p,s))):r.length>s&&e.push(new Ka(oa(p,s),oa(p,$f(r,o,f))))}e.length||e.push(new Ka(c,c)),Za(g,La(j.ranges.slice(0,i).concat(e),i),{origin:"*mouse",scroll:!1}),a.scrollIntoView(b)}else{var t=h,u=t.anchor,v=b;if("single"!=d){if("double"==d)var w=a.findWordAt(b);else var w=new Ka(oa(b.line,0),Oa(g,oa(b.line+1,0)));pa(w.anchor,u)>0?(v=w.head,u=sa(t.from(),w.anchor)):(v=w.anchor,u=ra(t.to(),w.head))}var e=j.ranges.slice(0);e[i]=new Ka(Oa(g,u),v),Za(g,La(e,i),Wf)}}function r(b){var c=++q,e=tc(a,b,!0,"rect"==d);if(e)if(0!=pa(e,n)){a.curOp.focus=ug(),o(e);var h=P(f,g);(e.line>=h.to||e.line<h.from)&&setTimeout(dc(a,function(){q==c&&r(b)}),150)}else{var i=b.clientY<p.top?-20:b.clientY>p.bottom?20:0;i&&setTimeout(dc(a,function(){q==c&&(f.scroller.scrollTop+=i,r(b))}),50)}}function s(b){a.state.selectingText=!1,q=1/0,Df(b),f.input.focus(),Kf(document,"mousemove",t),Kf(document,"mouseup",u),g.history.lastSelOrigin=null}var f=a.display,g=a.doc;Df(b);var h,i,j=g.sel,k=j.ranges;if(e&&!b.shiftKey?(i=g.sel.contains(c),h=i>-1?k[i]:new Ka(c,c)):(h=g.sel.primary(),i=g.sel.primIndex),b.altKey)d="rect",e||(h=new Ka(c,c)),c=tc(a,b,!0,!0),i=-1;else if("double"==d){var l=a.findWordAt(c);h=a.display.shift||g.extend?Sa(g,h,l.anchor,l.head):l}else if("triple"==d){var m=new Ka(oa(c.line,0),Oa(g,oa(c.line+1,0)));h=a.display.shift||g.extend?Sa(g,h,m.anchor,m.head):m}else h=Sa(g,h,c);e?-1==i?(i=k.length,Za(g,La(k.concat([h]),i),{scroll:!1,origin:"*mouse"})):k.length>1&&k[i].empty()&&"single"==d&&!b.shiftKey?(Za(g,La(k.slice(0,i).concat(k.slice(i+1)),0),{scroll:!1,origin:"*mouse"}),j=g.sel):Va(g,i,h,Wf):(i=0,Za(g,new Ja([h],0),Wf),j=g.sel);var n=c,p=f.wrapper.getBoundingClientRect(),q=0,t=dc(a,function(a){If(a)?r(a):s(a)}),u=dc(a,s);a.state.selectingText=u,Jf(document,"mousemove",t),Jf(document,"mouseup",u)}function Ac(a,b,c,d,e){try{var f=b.clientX,g=b.clientY}catch(b){return!1}if(f>=Math.floor(a.display.gutters.getBoundingClientRect().right))return!1;d&&Df(b);var h=a.display,i=h.lineDiv.getBoundingClientRect();if(g>i.bottom||!Rf(a,c))return Ff(b);g-=i.top-h.viewOffset;for(var j=0;j<a.options.gutters.length;++j){var k=h.gutters.childNodes[j];if(k&&k.getBoundingClientRect().right>=f){var l=lf(a.doc,g),m=a.options.gutters[j];return e(a,c,a,l,m,b),Ff(b)}}}function Bc(a,b){return Ac(a,b,"gutterClick",!0,Nf)}function Dc(a){var b=this;if(Gc(b),!Pf(b,a)&&!sc(b.display,a)){Df(a),d&&(Cc=+new Date);var c=tc(b,a,!0),e=a.dataTransfer.files;if(c&&!ua(b))if(e&&e.length&&window.FileReader&&window.File)for(var f=e.length,g=Array(f),h=0,i=function(a,d){var e=new FileReader;e.onload=dc(b,function(){if(g[d]=e.result,++h==f){c=Oa(b.doc,c);var a={from:c,to:c,text:b.doc.splitLines(g.join(b.doc.lineSeparator())),origin:"paste"};hd(b.doc,a),Ya(b.doc,Ma(c,bd(a)))}}),e.readAsText(a)},j=0;f>j;++j)i(e[j],j);else{if(b.state.draggingText&&b.doc.sel.contains(c)>-1)return b.state.draggingText(a),void setTimeout(function(){b.display.input.focus()},20);try{var g=a.dataTransfer.getData("Text");if(g){if(b.state.draggingText&&!(o?a.altKey:a.ctrlKey))var k=b.listSelections();if($a(b.doc,Ma(c,c)),k)for(var j=0;j<k.length;++j)nd(b.doc,"",k[j].anchor,k[j].head,"drag");b.replaceSelection(g,"around","paste"),b.display.input.focus()}}catch(a){}}}}function Ec(a,b){if(d&&(!a.state.draggingText||+new Date-Cc<100))return void Gf(b);if(!Pf(a,b)&&!sc(a.display,b)&&(b.dataTransfer.setData("Text",a.getSelection()),b.dataTransfer.setDragImage&&!j)){var c=pg("img",null,null,"position: fixed; left: 0; top: 0;");c.src="data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==",i&&(c.width=c.height=1,a.display.wrapper.appendChild(c),c._top=c.offsetTop),b.dataTransfer.setDragImage(c,0,0),i&&c.parentNode.removeChild(c)}}function Fc(a,b){var c=tc(a,b);if(c){var d=document.createDocumentFragment();fb(a,c,d),a.display.dragCursor||(a.display.dragCursor=pg("div",null,"CodeMirror-cursors CodeMirror-dragcursors"),a.display.lineSpace.insertBefore(a.display.dragCursor,a.display.cursorDiv)),sg(a.display.dragCursor,d)}}function Gc(a){a.display.dragCursor&&(a.display.lineSpace.removeChild(a.display.dragCursor),a.display.dragCursor=null)}function Hc(b,c){Math.abs(b.doc.scrollTop-c)<2||(b.doc.scrollTop=c,a||Y(b,{top:c}),b.display.scroller.scrollTop!=c&&(b.display.scroller.scrollTop=c),b.display.scrollbars.setScrollTop(c),a&&Y(b),ib(b,100))}function Ic(a,b,c){(c?b==a.doc.scrollLeft:Math.abs(a.doc.scrollLeft-b)<2)||(b=Math.min(b,a.display.scroller.scrollWidth-a.display.scroller.clientWidth),a.doc.scrollLeft=b,Q(a),a.display.scroller.scrollLeft!=b&&(a.display.scroller.scrollLeft=b),a.display.scrollbars.setScrollLeft(b))}function Mc(b,c){var d=Lc(c),e=d.x,g=d.y,h=b.display,j=h.scroller;if(e&&j.scrollWidth>j.clientWidth||g&&j.scrollHeight>j.clientHeight){if(g&&o&&f)a:for(var k=c.target,l=h.view;k!=j;k=k.parentNode)for(var m=0;m<l.length;m++)if(l[m].node==k){b.display.currentWheelTarget=k;break a}if(e&&!a&&!i&&null!=Kc)return g&&Hc(b,Math.max(0,Math.min(j.scrollTop+g*Kc,j.scrollHeight-j.clientHeight))),Ic(b,Math.max(0,Math.min(j.scrollLeft+e*Kc,j.scrollWidth-j.clientWidth))),Df(c),void(h.wheelStartX=null);if(g&&null!=Kc){var n=g*Kc,p=b.doc.scrollTop,q=p+h.wrapper.clientHeight;0>n?p=Math.max(0,p+n-50):q=Math.min(b.doc.height,q+n+50),Y(b,{top:p,bottom:q})}20>Jc&&(null==h.wheelStartX?(h.wheelStartX=j.scrollLeft,h.wheelStartY=j.scrollTop,h.wheelDX=e,h.wheelDY=g,setTimeout(function(){if(null!=h.wheelStartX){var a=j.scrollLeft-h.wheelStartX,b=j.scrollTop-h.wheelStartY,c=b&&h.wheelDY&&b/h.wheelDY||a&&h.wheelDX&&a/h.wheelDX;h.wheelStartX=h.wheelStartY=null,c&&(Kc=(Kc*Jc+c)/(Jc+1),++Jc)}},200)):(h.wheelDX+=e,h.wheelDY+=g))}}function Nc(a,b,c){if("string"==typeof b&&(b=Ld[b],!b))return!1;a.display.input.ensurePolled();var d=a.display.shift,e=!1;try{ua(a)&&(a.state.suppressEdits=!0),c&&(a.display.shift=!1),e=b(a)!=Uf}finally{a.display.shift=d,a.state.suppressEdits=!1}return e}function Oc(a,b,c){for(var d=0;d<a.state.keyMaps.length;d++){var e=Od(b,a.state.keyMaps[d],c,a);if(e)return e}return a.options.extraKeys&&Od(b,a.options.extraKeys,c,a)||Od(b,a.options.keyMap,c,a)}function Qc(a,b,c,d){var e=a.state.keySeq;if(e){if(Pd(b))return"handled";Pc.set(50,function(){a.state.keySeq==e&&(a.state.keySeq=null,a.display.input.reset())}),b=e+" "+b}var f=Oc(a,b,d);return"multi"==f&&(a.state.keySeq=b),"handled"==f&&Nf(a,"keyHandled",a,b,c),("handled"==f||"multi"==f)&&(Df(c),hb(a)),e&&!f&&/\'$/.test(b)?(Df(c),!0):!!f}function Rc(a,b){var c=Qd(b,!0);return c?b.shiftKey&&!a.state.keySeq?Qc(a,"Shift-"+c,b,function(b){return Nc(a,b,!0)})||Qc(a,c,b,function(b){return("string"==typeof b?/^go[A-Z]/.test(b):b.motion)?Nc(a,b):void 0}):Qc(a,c,b,function(b){return Nc(a,b)}):!1}function Sc(a,b,c){return Qc(a,"'"+c+"'",b,function(b){return Nc(a,b,!0)})}function Uc(a){var b=this;if(b.curOp.focus=ug(),!Pf(b,a)){d&&11>e&&27==a.keyCode&&(a.returnValue=!1);var c=a.keyCode;b.display.shift=16==c||a.shiftKey;var f=Rc(b,a);i&&(Tc=f?c:null,!f&&88==c&&!Kg&&(o?a.metaKey:a.ctrlKey)&&b.replaceSelection("",null,"cut")),18!=c||/\bCodeMirror-crosshair\b/.test(b.display.lineDiv.className)||Vc(b)}}function Vc(a){function c(a){18!=a.keyCode&&a.altKey||(wg(b,"CodeMirror-crosshair"),Kf(document,"keyup",c),Kf(document,"mouseover",c))}var b=a.display.lineDiv;xg(b,"CodeMirror-crosshair"),Jf(document,"keyup",c),Jf(document,"mouseover",c)}function Wc(a){16==a.keyCode&&(this.doc.sel.shift=!1),Pf(this,a)}function Xc(a){var b=this;if(!(sc(b.display,a)||Pf(b,a)||a.ctrlKey&&!a.altKey||o&&a.metaKey)){var c=a.keyCode,d=a.charCode;if(i&&c==Tc)return Tc=null,void Df(a);if(!i||a.which&&!(a.which<10)||!Rc(b,a)){var e=String.fromCharCode(null==d?c:d);Sc(b,a,e)||b.display.input.onKeyPress(a)}}}function Yc(a){a.state.delayingBlurEvent=!0,setTimeout(function(){a.state.delayingBlurEvent&&(a.state.delayingBlurEvent=!1,$c(a))},100)}function Zc(a){a.state.delayingBlurEvent&&(a.state.delayingBlurEvent=!1),"nocursor"!=a.options.readOnly&&(a.state.focused||(Lf(a,"focus",a),a.state.focused=!0,xg(a.display.wrapper,"CodeMirror-focused"),a.curOp||a.display.selForContextMenu==a.doc.sel||(a.display.input.reset(),f&&setTimeout(function(){a.display.input.reset(!0)},20)),a.display.input.receivedFocus()),hb(a))}function $c(a){a.state.delayingBlurEvent||(a.state.focused&&(Lf(a,"blur",a),a.state.focused=!1,wg(a.display.wrapper,"CodeMirror-focused")),clearInterval(a.display.blinker),setTimeout(function(){a.state.focused||(a.display.shift=!1)},150))}function _c(a,b){sc(a.display,b)||ad(a,b)||a.display.input.onContextMenu(b)}function ad(a,b){return Rf(a,"gutterContextMenu")?Ac(a,b,"gutterContextMenu",!1,Lf):!1}function cd(a,b){if(pa(a,b.from)<0)return a;if(pa(a,b.to)<=0)return bd(b);var c=a.line+b.text.length-(b.to.line-b.from.line)-1,d=a.ch;return a.line==b.to.line&&(d+=bd(b).ch-b.to.ch),oa(c,d)}function dd(a,b){for(var c=[],d=0;d<a.sel.ranges.length;d++){var e=a.sel.ranges[d];c.push(new Ka(cd(e.anchor,b),cd(e.head,b)))}return La(c,a.sel.primIndex)}function ed(a,b,c){return a.line==b.line?oa(c.line,a.ch-b.ch+c.ch):oa(c.line+(a.line-b.line),a.ch)}function fd(a,b,c){for(var d=[],e=oa(a.first,0),f=e,g=0;g<b.length;g++){var h=b[g],i=ed(h.from,e,f),j=ed(bd(h),e,f);if(e=h.to,f=j,"around"==c){var k=a.sel.ranges[g],l=pa(k.head,k.anchor)<0;d[g]=new Ka(l?j:i,l?i:j)}else d[g]=new Ka(i,i)}return new Ja(d,a.sel.primIndex)}function gd(a,b,c){var d={canceled:!1,from:b.from,to:b.to,text:b.text,origin:b.origin,cancel:function(){this.canceled=!0}};return c&&(d.update=function(b,c,d,e){b&&(this.from=Oa(a,b)),c&&(this.to=Oa(a,c)),d&&(this.text=d),void 0!==e&&(this.origin=e)}),Lf(a,"beforeChange",a,d),a.cm&&Lf(a.cm,"beforeChange",a.cm,d),d.canceled?null:{from:d.from,to:d.to,text:d.text,origin:d.origin}}function hd(a,b,c){if(a.cm){if(!a.cm.curOp)return dc(a.cm,hd)(a,b,c);if(a.cm.state.suppressEdits)return}if(!(Rf(a,"beforeChange")||a.cm&&Rf(a.cm,"beforeChange"))||(b=gd(a,b,!0))){var d=t&&!c&&ie(a,b.from,b.to);if(d)for(var e=d.length-1;e>=0;--e)id(a,{from:d[e].from,to:d[e].to,text:e?[""]:b.text});else id(a,b)}}function id(a,b){if(1!=b.text.length||""!=b.text[0]||0!=pa(b.from,b.to)){var c=dd(a,b);sf(a,b,c,a.cm?a.cm.curOp.id:NaN),ld(a,b,c,fe(a,b));var d=[];df(a,function(a,c){c||-1!=dg(d,a.history)||(Cf(a.history,b),d.push(a.history)),ld(a,b,null,fe(a,b))})}}function jd(a,b,c){if(!a.cm||!a.cm.state.suppressEdits){for(var e,d=a.history,f=a.sel,g="undo"==b?d.done:d.undone,h="undo"==b?d.undone:d.done,i=0;i<g.length&&(e=g[i],c?!e.ranges||e.equals(a.sel):e.ranges);i++);if(i!=g.length){for(d.lastOrigin=d.lastSelOrigin=null;e=g.pop(),e.ranges;){if(vf(e,h),c&&!e.equals(a.sel))return void Za(a,e,{clearRedo:!1});f=e}var j=[];vf(f,h),h.push({changes:j,generation:d.generation}),d.generation=e.generation||++d.maxGeneration;for(var k=Rf(a,"beforeChange")||a.cm&&Rf(a.cm,"beforeChange"),i=e.changes.length-1;i>=0;--i){var l=e.changes[i];if(l.origin=b,k&&!gd(a,l,!1))return void(g.length=0);j.push(pf(a,l));var m=i?dd(a,l):bg(g);ld(a,l,m,he(a,l)),!i&&a.cm&&a.cm.scrollIntoView({from:l.from,to:bd(l)});var n=[];df(a,function(a,b){b||-1!=dg(n,a.history)||(Cf(a.history,l),n.push(a.history)),ld(a,l,null,he(a,l))})}}}}function kd(a,b){if(0!=b&&(a.first+=b,a.sel=new Ja(eg(a.sel.ranges,function(a){return new Ka(oa(a.anchor.line+b,a.anchor.ch),oa(a.head.line+b,a.head.ch))}),a.sel.primIndex),a.cm)){ic(a.cm,a.first,a.first-b,b);for(var c=a.cm.display,d=c.viewFrom;d<c.viewTo;d++)jc(a.cm,d,"gutter")}}function ld(a,b,c,d){if(a.cm&&!a.cm.curOp)return dc(a.cm,ld)(a,b,c,d);if(b.to.line<a.first)return void kd(a,b.text.length-1-(b.to.line-b.from.line));if(!(b.from.line>a.lastLine())){if(b.from.line<a.first){var e=b.text.length-1-(a.first-b.from.line);kd(a,e),b={from:oa(a.first,0),to:oa(b.to.line+e,b.to.ch),text:[bg(b.text)],origin:b.origin}}var f=a.lastLine();b.to.line>f&&(b={from:b.from,to:oa(f,ff(a,f).text.length),text:[b.text[0]],origin:b.origin}),b.removed=gf(a,b.from,b.to),c||(c=dd(a,b)),a.cm?md(a.cm,b,d):Ye(a,b,d),$a(a,c,Vf)}}function md(a,b,c){var d=a.doc,e=a.display,f=b.from,g=b.to,h=!1,i=f.line;a.options.lineWrapping||(i=kf(se(ff(d,f.line))),d.iter(i,g.line+1,function(a){return a==e.maxLine?(h=!0,!0):void 0})),d.sel.contains(b.from,b.to)>-1&&Qf(a),Ye(d,b,c,A(a)),a.options.lineWrapping||(d.iter(i,f.line+b.text.length,function(a){var b=G(a);b>e.maxLineLength&&(e.maxLine=a,e.maxLineLength=b,e.maxLineChanged=!0,h=!1)}),h&&(a.curOp.updateMaxLine=!0)),d.frontier=Math.min(d.frontier,f.line),ib(a,400);var j=b.text.length-(g.line-f.line)-1;b.full?ic(a):f.line!=g.line||1!=b.text.length||Xe(a.doc,b)?ic(a,f.line,g.line+1,j):jc(a,f.line,"text");var k=Rf(a,"changes"),l=Rf(a,"change");if(l||k){var m={from:f,to:g,text:b.text,removed:b.removed,origin:b.origin};l&&Nf(a,"change",a,m),k&&(a.curOp.changeObjs||(a.curOp.changeObjs=[])).push(m)}a.display.selForContextMenu=null}function nd(a,b,c,d,e){if(d||(d=c),pa(d,c)<0){var f=d;d=c,c=f}"string"==typeof b&&(b=a.splitLines(b)),hd(a,{from:c,to:d,text:b,origin:e})}function od(a,b){if(!Pf(a,"scrollCursorIntoView")){var c=a.display,d=c.sizer.getBoundingClientRect(),e=null;if(b.top+d.top<0?e=!0:b.bottom+d.top>(window.innerHeight||document.documentElement.clientHeight)&&(e=!1),null!=e&&!l){var f=pg("div","\u200b",null,"position: absolute; top: "+(b.top-c.viewOffset-mb(a.display))+"px; height: "+(b.bottom-b.top+pb(a)+c.barHeight)+"px; left: "+b.left+"px; width: 2px;");a.display.lineSpace.appendChild(f),f.scrollIntoView(e),a.display.lineSpace.removeChild(f)}}}function pd(a,b,c,d){null==d&&(d=0);for(var e=0;5>e;e++){var f=!1,g=Lb(a,b),h=c&&c!=b?Lb(a,c):g,i=rd(a,Math.min(g.left,h.left),Math.min(g.top,h.top)-d,Math.max(g.left,h.left),Math.max(g.bottom,h.bottom)+d),j=a.doc.scrollTop,k=a.doc.scrollLeft;if(null!=i.scrollTop&&(Hc(a,i.scrollTop),Math.abs(a.doc.scrollTop-j)>1&&(f=!0)),null!=i.scrollLeft&&(Ic(a,i.scrollLeft),Math.abs(a.doc.scrollLeft-k)>1&&(f=!0)),!f)break}return g}function qd(a,b,c,d,e){var f=rd(a,b,c,d,e);null!=f.scrollTop&&Hc(a,f.scrollTop),null!=f.scrollLeft&&Ic(a,f.scrollLeft)}function rd(a,b,c,d,e){var f=a.display,g=Rb(a.display);0>c&&(c=0);var h=a.curOp&&null!=a.curOp.scrollTop?a.curOp.scrollTop:f.scroller.scrollTop,i=rb(a),j={};e-c>i&&(e=c+i);var k=a.doc.height+nb(f),l=g>c,m=e>k-g;if(h>c)j.scrollTop=l?0:c;else if(e>h+i){var n=Math.min(c,(m?k:e)-i);n!=h&&(j.scrollTop=n)}var o=a.curOp&&null!=a.curOp.scrollLeft?a.curOp.scrollLeft:f.scroller.scrollLeft,p=qb(a)-(a.options.fixedGutter?f.gutters.offsetWidth:0),q=d-b>p;return 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j,h=b.line,i=a.cm;if(a.iter(h,c.line+1,function(a){i&&f.collapsed&&!i.options.lineWrapping&&se(a)==i.display.maxLine&&(j=!0),f.collapsed&&h!=b.line&&jf(a,0),ce(a,new _d(f,h==b.line?b.ch:null,h==c.line?c.ch:null)),++h}),f.collapsed&&a.iter(b.line,c.line+1,function(b){we(a,b)&&jf(b,0)}),f.clearOnEnter&&Jf(f,"beforeCursorEnter",function(){f.clear()}),f.readOnly&&(t=!0,(a.history.done.length||a.history.undone.length)&&a.clearHistory()),f.collapsed&&(f.id=++Td,f.atomic=!0),i){if(j&&(i.curOp.updateMaxLine=!0),f.collapsed)ic(i,b.line,c.line+1);else if(f.className||f.title||f.startStyle||f.endStyle||f.css)for(var k=b.line;k<=c.line;k++)jc(i,k,"text");f.atomic&&ab(i.doc),Nf(i,"markerAdded",i,f)}return f}function Xd(a,b,c,d,e){d=hg(d),d.shared=!1;var f=[Vd(a,b,c,d,e)],g=f[0],h=d.widgetNode;return df(a,function(a){h&&(d.widgetNode=h.cloneNode(!0)),f.push(Vd(a,Oa(a,b),Oa(a,c),d,e));for(var i=0;i<a.linked.length;++i)if(a.linked[i].isParent)return;g=bg(f)}),new Wd(f,g)}function Yd(a){return a.findMarks(oa(a.first,0),a.clipPos(oa(a.lastLine())),function(a){return a.parent})}function Zd(a,b){for(var c=0;c<b.length;c++){var d=b[c],e=d.find(),f=a.clipPos(e.from),g=a.clipPos(e.to);if(pa(f,g)){var h=Vd(a,f,g,d.primary,d.primary.type);d.markers.push(h),h.parent=d}}}function $d(a){for(var b=0;b<a.length;b++){var c=a[b],d=[c.primary.doc];df(c.primary.doc,function(a){d.push(a)});for(var e=0;e<c.markers.length;e++){var f=c.markers[e];-1==dg(d,f.doc)&&(f.parent=null,c.markers.splice(e--,1))}}}function _d(a,b,c){this.marker=a,this.from=b,this.to=c}function ae(a,b){if(a)for(var c=0;c<a.length;++c){var d=a[c];if(d.marker==b)return d}}function be(a,b){for(var c,d=0;d<a.length;++d)a[d]!=b&&(c||(c=[])).push(a[d]);return c}function ce(a,b){a.markedSpans=a.markedSpans?a.markedSpans.concat([b]):[b],b.marker.attachLine(a)}function de(a,b,c){if(a)for(var e,d=0;d<a.length;++d){var 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b=a.scrollWidth>a.clientWidth+1,c=a.scrollHeight>a.clientHeight+1,d=a.nativeBarWidth;if(c){this.vert.style.display="block",this.vert.style.bottom=b?d+"px":"0";var e=a.viewHeight-(b?d:0);this.vert.firstChild.style.height=Math.max(0,a.scrollHeight-a.clientHeight+e)+"px"}else this.vert.style.display="",this.vert.firstChild.style.height="0";if(b){this.horiz.style.display="block",this.horiz.style.right=c?d+"px":"0",this.horiz.style.left=a.barLeft+"px";var f=a.viewWidth-a.barLeft-(c?d:0);this.horiz.firstChild.style.width=a.scrollWidth-a.clientWidth+f+"px"}else this.horiz.style.display="",this.horiz.firstChild.style.width="0";return!this.checkedOverlay&&a.clientHeight>0&&(0==d&&this.overlayHack(),this.checkedOverlay=!0),{right:c?d:0,bottom:b?d:0}},setScrollLeft:function(a){this.horiz.scrollLeft!=a&&(this.horiz.scrollLeft=a)},setScrollTop:function(a){this.vert.scrollTop!=a&&(this.vert.scrollTop=a)},overlayHack:function(){var a=o&&!k?"12px":"18px";this.horiz.style.minHeight=this.vert.style.minWidth=a;var b=this,c=function(a){Hf(a)!=b.vert&&Hf(a)!=b.horiz&&dc(b.cm,uc)(a)};Jf(this.vert,"mousedown",c),Jf(this.horiz,"mousedown",c)},clear:function(){var a=this.horiz.parentNode;a.removeChild(this.horiz),a.removeChild(this.vert)}},K.prototype),L.prototype=hg({update:function(){return{bottom:0,right:0}},setScrollLeft:function(){},setScrollTop:function(){},clear:function(){}},L.prototype),v.scrollbarModel={"native":K,"null":L},U.prototype.signal=function(a,b){Rf(a,b)&&this.events.push(arguments)},U.prototype.finish=function(){for(var a=0;a<this.events.length;a++)Lf.apply(null,this.events[a])};var oa=v.Pos=function(a,b){return this instanceof oa?(this.line=a,void(this.ch=b)):new oa(a,b)},pa=v.cmpPos=function(a,b){return a.line-b.line||a.ch-b.ch},va=null;Ba.prototype=hg({init:function(a){function h(a){if(c.somethingSelected())va=c.getSelections(),b.inaccurateSelection&&(b.prevInput="",b.inaccurateSelection=!1,g.value=va.join("\n"),cg(g));else{if(!c.options.lineWiseCopyCut)return;var d=za(c);va=d.text,"cut"==a.type?c.setSelections(d.ranges,null,Vf):(b.prevInput="",g.value=d.text.join("\n"),cg(g))}"cut"==a.type&&(c.state.cutIncoming=!0)}var b=this,c=this.cm,f=this.wrapper=Ca(),g=this.textarea=f.firstChild;a.wrapper.insertBefore(f,a.wrapper.firstChild),m&&(g.style.width="0px"),Jf(g,"input",function(){d&&e>=9&&b.hasSelection&&(b.hasSelection=null),b.poll()}),Jf(g,"paste",function(a){return xa(a,c)?!0:(c.state.pasteIncoming=!0,void b.fastPoll())}),Jf(g,"cut",h),Jf(g,"copy",h),Jf(a.scroller,"paste",function(d){sc(a,d)||(c.state.pasteIncoming=!0,b.focus())}),Jf(a.lineSpace,"selectstart",function(b){sc(a,b)||Df(b)}),Jf(g,"compositionstart",function(){var a=c.getCursor("from");b.composing&&b.composing.range.clear(),
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i=b?"-":c||f.getSelection();this.textarea.value=i,f.state.focused&&cg(this.textarea),d&&e>=9&&(this.hasSelection=i)}else a||(this.prevInput=this.textarea.value="",d&&e>=9&&(this.hasSelection=null));this.inaccurateSelection=b}},getField:function(){return this.textarea},supportsTouch:function(){return!1},focus:function(){if("nocursor"!=this.cm.options.readOnly&&(!n||ug()!=this.textarea))try{this.textarea.focus()}catch(a){}},blur:function(){this.textarea.blur()},resetPosition:function(){this.wrapper.style.top=this.wrapper.style.left=0},receivedFocus:function(){this.slowPoll()},slowPoll:function(){var a=this;a.pollingFast||a.polling.set(this.cm.options.pollInterval,function(){a.poll(),a.cm.state.focused&&a.slowPoll()})},fastPoll:function(){function c(){var d=b.poll();d||a?(b.pollingFast=!1,b.slowPoll()):(a=!0,b.polling.set(60,c))}var a=!1,b=this;b.pollingFast=!0,b.polling.set(20,c)},poll:function(){var a=this.cm,b=this.textarea,c=this.prevInput;if(this.contextMenuPending||!a.state.focused||Jg(b)&&!c&&!this.composing||ua(a)||a.options.disableInput||a.state.keySeq)return!1;var f=b.value;if(f==c&&!a.somethingSelected())return!1;if(d&&e>=9&&this.hasSelection===f||o&&/[\uf700-\uf7ff]/.test(f))return a.display.input.reset(),!1;if(a.doc.sel==a.display.selForContextMenu){var g=f.charCodeAt(0);if(8203!=g||c||(c="\u200b"),8666==g)return this.reset(),this.cm.execCommand("undo")}for(var h=0,i=Math.min(c.length,f.length);i>h&&c.charCodeAt(h)==f.charCodeAt(h);)++h;var j=this;return cc(a,function(){wa(a,f.slice(h),c.length-h,null,j.composing?"*compose":null),f.length>1e3||f.indexOf("\n")>-1?b.value=j.prevInput="":j.prevInput=f,j.composing&&(j.composing.range.clear(),j.composing.range=a.markText(j.composing.start,a.getCursor("to"),{className:"CodeMirror-composing"}))}),!0},ensurePolled:function(){this.pollingFast&&this.poll()&&(this.pollingFast=!1)},onKeyPress:function(){d&&e>=9&&(this.hasSelection=null),this.fastPoll()},onContextMenu:function(a){function o(){if(null!=h.selectionStart){var a=c.somethingSelected(),d="\u200b"+(a?h.value:"");h.value="\u21da",h.value=d,b.prevInput=a?"":"\u200b",h.selectionStart=1,h.selectionEnd=d.length,g.selForContextMenu=c.doc.sel}}function p(){if(b.contextMenuPending=!1,b.wrapper.style.position="relative",h.style.cssText=m,d&&9>e&&g.scrollbars.setScrollTop(g.scroller.scrollTop=k),null!=h.selectionStart){(!d||d&&9>e)&&o();var a=0,f=function(){g.selForContextMenu==c.doc.sel&&0==h.selectionStart&&h.selectionEnd>0&&"\u200b"==b.prevInput?dc(c,Ld.selectAll)(c):a++<10?g.detectingSelectAll=setTimeout(f,500):g.input.reset()};g.detectingSelectAll=setTimeout(f,200)}}var b=this,c=b.cm,g=c.display,h=b.textarea,j=tc(c,a),k=g.scroller.scrollTop;if(j&&!i){var l=c.options.resetSelectionOnContextMenu;l&&-1==c.doc.sel.contains(j)&&dc(c,Za)(c.doc,Ma(j),Vf);var m=h.style.cssText;if(b.wrapper.style.position="absolute",h.style.cssText="position: fixed; width: 30px; height: 30px; top: "+(a.clientY-5)+"px; left: "+(a.clientX-5)+"px; z-index: 1000; background: "+(d?"rgba(255, 255, 255, .05)":"transparent")+"; outline: none; border-width: 0; outline: none; overflow: hidden; opacity: .05; filter: alpha(opacity=5);",f)var n=window.scrollY;if(g.input.focus(),f&&window.scrollTo(null,n),g.input.reset(),c.somethingSelected()||(h.value=b.prevInput=" "),b.contextMenuPending=!0,g.selForContextMenu=c.doc.sel,clearTimeout(g.detectingSelectAll),d&&e>=9&&o(),s){Gf(a);var q=function(){Kf(window,"mouseup",q),setTimeout(p,20)};Jf(window,"mouseup",q)}else setTimeout(p,50)}},setUneditable:fg,needsContentAttribute:!1},Ba.prototype),Da.prototype=hg({init:function(a){function e(a){if(c.somethingSelected())va=c.getSelections(),"cut"==a.type&&c.replaceSelection("",null,"cut");else{if(!c.options.lineWiseCopyCut)return;var b=za(c);va=b.text,"cut"==a.type&&c.operation(function(){c.setSelections(b.ranges,0,Vf),c.replaceSelection("",null,"cut")})}if(a.clipboardData&&!m)a.preventDefault(),a.clipboardData.clearData(),a.clipboardData.setData("text/plain",va.join("\n"));else{var d=Ca(),e=d.firstChild;c.display.lineSpace.insertBefore(d,c.display.lineSpace.firstChild),e.value=va.join("\n");var f=document.activeElement;cg(e),setTimeout(function(){c.display.lineSpace.removeChild(d),f.focus()},50)}}var b=this,c=b.cm,d=b.div=a.lineDiv;d.contentEditable="true",Aa(d),Jf(d,"paste",function(a){xa(a,c)}),Jf(d,"compositionstart",function(a){var d=a.data;if(b.composing={sel:c.doc.sel,data:d,startData:d},d){var e=c.doc.sel.primary(),f=c.getLine(e.head.line),g=f.indexOf(d,Math.max(0,e.head.ch-d.length));g>-1&&g<=e.head.ch&&(b.composing.sel=Ma(oa(e.head.line,g),oa(e.head.line,g+d.length)))}}),Jf(d,"compositionupdate",function(a){b.composing.data=a.data}),Jf(d,"compositionend",function(a){var c=b.composing;c&&(a.data==c.startData||/\u200b/.test(a.data)||(c.data=a.data),setTimeout(function(){c.handled||b.applyComposition(c),b.composing==c&&(b.composing=null)},50))}),Jf(d,"touchstart",function(){b.forceCompositionEnd()}),Jf(d,"input",function(){b.composing||b.pollContent()||cc(b.cm,function(){ic(c)})}),Jf(d,"copy",e),Jf(d,"cut",e)},prepareSelection:function(){var a=eb(this.cm,!1);return a.focus=this.cm.state.focused,a},showSelection:function(a){a&&this.cm.display.view.length&&(a.focus&&this.showPrimarySelection(),this.showMultipleSelections(a))},showPrimarySelection:function(){var b=window.getSelection(),c=this.cm.doc.sel.primary(),d=Ga(this.cm,b.anchorNode,b.anchorOffset),e=Ga(this.cm,b.focusNode,b.focusOffset);if(!d||d.bad||!e||e.bad||0!=pa(sa(d,e),c.from())||0!=pa(ra(d,e),c.to())){var f=Ea(this.cm,c.from()),g=Ea(this.cm,c.to());if(f||g){var h=this.cm.display.view,i=b.rangeCount&&b.getRangeAt(0);if(f){if(!g){var j=h[h.length-1].measure,k=j.maps?j.maps[j.maps.length-1]:j.map;g={node:k[k.length-1],offset:k[k.length-2]-k[k.length-3]}}}else f={node:h[0].measure.map[2],offset:0};try{var l=qg(f.node,f.offset,g.offset,g.node)}catch(m){}l&&(b.removeAllRanges(),b.addRange(l),i&&null==b.anchorNode?b.addRange(i):a&&this.startGracePeriod()),this.rememberSelection()}}},startGracePeriod:function(){var a=this;clearTimeout(this.gracePeriod),this.gracePeriod=setTimeout(function(){a.gracePeriod=!1,a.selectionChanged()&&a.cm.operation(function(){a.cm.curOp.selectionChanged=!0})},20)},showMultipleSelections:function(a){sg(this.cm.display.cursorDiv,a.cursors),sg(this.cm.display.selectionDiv,a.selection)},rememberSelection:function(){var a=window.getSelection();this.lastAnchorNode=a.anchorNode,this.lastAnchorOffset=a.anchorOffset,this.lastFocusNode=a.focusNode,this.lastFocusOffset=a.focusOffset},selectionInEditor:function(){var a=window.getSelection();if(!a.rangeCount)return!1;var b=a.getRangeAt(0).commonAncestorContainer;return tg(this.div,b)},focus:function(){"nocursor"!=this.cm.options.readOnly&&this.div.focus()},blur:function(){this.div.blur()},getField:function(){return this.div},supportsTouch:function(){return!0},receivedFocus:function(){function b(){a.cm.state.focused&&(a.pollSelection(),a.polling.set(a.cm.options.pollInterval,b))}var a=this;this.selectionInEditor()?this.pollSelection():cc(this.cm,function(){a.cm.curOp.selectionChanged=!0}),this.polling.set(this.cm.options.pollInterval,b)},selectionChanged:function(){var a=window.getSelection();return a.anchorNode!=this.lastAnchorNode||a.anchorOffset!=this.lastAnchorOffset||a.focusNode!=this.lastFocusNode||a.focusOffset!=this.lastFocusOffset},pollSelection:function(){if(!this.composing&&!this.gracePeriod&&this.selectionChanged()){var a=window.getSelection(),b=this.cm;this.rememberSelection();var c=Ga(b,a.anchorNode,a.anchorOffset),d=Ga(b,a.focusNode,a.focusOffset);c&&d&&cc(b,function(){Za(b.doc,Ma(c,d),Vf),(c.bad||d.bad)&&(b.curOp.selectionChanged=!0)})}},pollContent:function(){var a=this.cm,b=a.display,c=a.doc.sel.primary(),d=c.from(),e=c.to();if(d.line<b.viewFrom||e.line>b.viewTo-1)return!1;var f;if(d.line==b.viewFrom||0==(f=lc(a,d.line)))var g=kf(b.view[0].line),h=b.view[0].node;else var g=kf(b.view[f].line),h=b.view[f-1].node.nextSibling;var i=lc(a,e.line);if(i==b.view.length-1)var j=b.viewTo-1,k=b.lineDiv.lastChild;else var j=kf(b.view[i+1].line)-1,k=b.view[i+1].node.previousSibling;for(var l=a.doc.splitLines(Ia(a,h,k,g,j)),m=gf(a.doc,oa(g,0),oa(j,ff(a.doc,j).text.length));l.length>1&&m.length>1;)if(bg(l)==bg(m))l.pop(),m.pop(),j--;else{if(l[0]!=m[0])break;l.shift(),m.shift(),g++}for(var n=0,o=0,p=l[0],q=m[0],r=Math.min(p.length,q.length);r>n&&p.charCodeAt(n)==q.charCodeAt(n);)++n;for(var s=bg(l),t=bg(m),u=Math.min(s.length-(1==l.length?n:0),t.length-(1==m.length?n:0));u>o&&s.charCodeAt(s.length-o-1)==t.charCodeAt(t.length-o-1);)++o;l[l.length-1]=s.slice(0,s.length-o),l[0]=l[0].slice(n);var v=oa(g,n),w=oa(j,m.length?bg(m).length-o:0);return l.length>1||l[0]||pa(v,w)?(nd(a.doc,l,v,w,"+input"),!0):void 0},ensurePolled:function(){this.forceCompositionEnd()},reset:function(){this.forceCompositionEnd()},forceCompositionEnd:function(){this.composing&&!this.composing.handled&&(this.applyComposition(this.composing),this.composing.handled=!0,this.div.blur(),this.div.focus())},applyComposition:function(a){a.data&&a.data!=a.startData&&dc(this.cm,wa)(this.cm,a.data,0,a.sel)},setUneditable:function(a){a.setAttribute("contenteditable","false")},onKeyPress:function(a){a.preventDefault(),dc(this.cm,wa)(this.cm,String.fromCharCode(null==a.charCode?a.keyCode:a.charCode),0)},onContextMenu:fg,resetPosition:fg,needsContentAttribute:!0},Da.prototype),v.inputStyles={textarea:Ba,contenteditable:Da},Ja.prototype={primary:function(){return this.ranges[this.primIndex]},equals:function(a){if(a==this)return!0;if(a.primIndex!=this.primIndex||a.ranges.length!=this.ranges.length)return!1;for(var b=0;b<this.ranges.length;b++){var c=this.ranges[b],d=a.ranges[b];if(0!=pa(c.anchor,d.anchor)||0!=pa(c.head,d.head))return!1}return!0},deepCopy:function(){for(var a=[],b=0;b<this.ranges.length;b++)a[b]=new Ka(qa(this.ranges[b].anchor),qa(this.ranges[b].head));return new Ja(a,this.primIndex)},somethingSelected:function(){for(var a=0;a<this.ranges.length;a++)if(!this.ranges[a].empty())return!0;return!1},contains:function(a,b){b||(b=a);for(var c=0;c<this.ranges.length;c++){var d=this.ranges[c];if(pa(b,d.from())>=0&&pa(a,d.to())<=0)return c}return-1}},Ka.prototype={from:function(){return sa(this.anchor,this.head)},to:function(){return ra(this.anchor,this.head)},empty:function(){return this.head.line==this.anchor.line&&this.head.ch==this.anchor.ch}};var Qb,vc,wc,zb={left:0,right:0,top:0,bottom:0},Tb=null,Ub=0,Cc=0,Jc=0,Kc=null;d?Kc=-.53:a?Kc=15:h?Kc=-.7:j&&(Kc=-1/3);var Lc=function(a){var b=a.wheelDeltaX,c=a.wheelDeltaY;return null==b&&a.detail&&a.axis==a.HORIZONTAL_AXIS&&(b=a.detail),null==c&&a.detail&&a.axis==a.VERTICAL_AXIS?c=a.detail:null==c&&(c=a.wheelDelta),{x:b,y:c}};v.wheelEventPixels=function(a){var b=Lc(a);return b.x*=Kc,b.y*=Kc,b};var Pc=new Yf,Tc=null,bd=v.changeEnd=function(a){return a.text?oa(a.from.line+a.text.length-1,bg(a.text).length+(1==a.text.length?a.from.ch:0)):a.to};v.prototype={constructor:v,focus:function(){window.focus(),this.display.input.focus()},setOption:function(a,b){var c=this.options,d=c[a];(c[a]!=b||"mode"==a)&&(c[a]=b,Bd.hasOwnProperty(a)&&dc(this,Bd[a])(this,b,d))},getOption:function(a){return this.options[a]},getDoc:function(){return this.doc},addKeyMap:function(a,b){this.state.keyMaps[b?"push":"unshift"](Rd(a))},removeKeyMap:function(a){for(var b=this.state.keyMaps,c=0;c<b.length;++c)if(b[c]==a||b[c].name==a)return b.splice(c,1),!0},addOverlay:ec(function(a,b){var c=a.token?a:v.getMode(this.options,a);if(c.startState)throw new Error("Overlays may not be 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Ie(this,a,b)},getLineTokens:function(a,b){return Ie(this,oa(a),b,!0)},getTokenTypeAt:function(a){a=Oa(this.doc,a);var f,b=Le(this,ff(this.doc,a.line)),c=0,d=(b.length-1)/2,e=a.ch;if(0==e)f=b[2];else for(;;){var g=c+d>>1;if((g?b[2*g-1]:0)>=e)d=g;else{if(!(b[2*g+1]<e)){f=b[2*g+2];break}c=g+1}}var h=f?f.indexOf("cm-overlay "):-1;return 0>h?f:0==h?null:f.slice(0,h-1)},getModeAt:function(a){var b=this.doc.mode;return b.innerMode?v.innerMode(b,this.getTokenAt(a).state).mode:b},getHelper:function(a,b){return this.getHelpers(a,b)[0]},getHelpers:function(a,b){var c=[];if(!Id.hasOwnProperty(b))return c;var d=Id[b],e=this.getModeAt(a);if("string"==typeof e[b])d[e[b]]&&c.push(d[e[b]]);else if(e[b])for(var f=0;f<e[b].length;f++){var g=d[e[b][f]];g&&c.push(g)}else e.helperType&&d[e.helperType]?c.push(d[e.helperType]):d[e.name]&&c.push(d[e.name]);for(var f=0;f<d._global.length;f++){var h=d._global[f];h.pred(e,this)&&-1==dg(c,h.val)&&c.push(h.val)}return c},getStateAfter:function(a,b){var c=this.doc;return a=Na(c,null==a?c.first+c.size-1:a),lb(this,a+1,b)},cursorCoords:function(a,b){var c,d=this.doc.sel.primary();return c=null==a?d.head:"object"==typeof a?Oa(this.doc,a):a?d.from():d.to(),Lb(this,c,b||"page")},charCoords:function(a,b){return Kb(this,Oa(this.doc,a),b||"page")},coordsChar:function(a,b){return a=Jb(this,a,b||"page"),Ob(this,a.left,a.top)},lineAtHeight:function(a,b){return a=Jb(this,{top:a,left:0},b||"page").top,lf(this.doc,a+this.display.viewOffset)},heightAtLine:function(a,b){var d,c=!1;if("number"==typeof a){var e=this.doc.first+this.doc.size-1;a<this.doc.first?a=this.doc.first:a>e&&(a=e,c=!0),d=ff(this.doc,a)}else d=a;return Ib(this,d,{top:0,left:0},b||"page").top+(c?this.doc.height-mf(d):0)},defaultTextHeight:function(){return Rb(this.display)},defaultCharWidth:function(){return Sb(this.display)},setGutterMarker:ec(function(a,b,c){return wd(this.doc,a,"gutter",function(a){var d=a.gutterMarkers||(a.gutterMarkers={});return d[b]=c,!c&&mg(d)&&(a.gutterMarkers=null),!0})}),clearGutter:ec(function(a){var b=this,c=b.doc,d=c.first;c.iter(function(c){c.gutterMarkers&&c.gutterMarkers[a]&&(c.gutterMarkers[a]=null,jc(b,d,"gutter"),mg(c.gutterMarkers)&&(c.gutterMarkers=null)),++d})}),lineInfo:function(a){if("number"==typeof a){if(!Qa(this.doc,a))return null;var b=a;if(a=ff(this.doc,a),!a)return null}else{var b=kf(a);if(null==b)return null}return{line:b,handle:a,text:a.text,gutterMarkers:a.gutterMarkers,textClass:a.textClass,bgClass:a.bgClass,wrapClass:a.wrapClass,widgets:a.widgets}},getViewport:function(){return{from:this.display.viewFrom,to:this.display.viewTo}},addWidget:function(a,b,c,d,e){var f=this.display;a=Lb(this,Oa(this.doc,a));var g=a.bottom,h=a.left;if(b.style.position="absolute",b.setAttribute("cm-ignore-events","true"),this.display.input.setUneditable(b),f.sizer.appendChild(b),"over"==d)g=a.top;else if("above"==d||"near"==d){var i=Math.max(f.wrapper.clientHeight,this.doc.height),j=Math.max(f.sizer.clientWidth,f.lineSpace.clientWidth);("above"==d||a.bottom+b.offsetHeight>i)&&a.top>b.offsetHeight?g=a.top-b.offsetHeight:a.bottom+b.offsetHeight<=i&&(g=a.bottom),h+b.offsetWidth>j&&(h=j-b.offsetWidth)}b.style.top=g+"px",b.style.left=b.style.right="","right"==e?(h=f.sizer.clientWidth-b.offsetWidth,b.style.right="0px"):("left"==e?h=0:"middle"==e&&(h=(f.sizer.clientWidth-b.offsetWidth)/2),b.style.left=h+"px"),c&&qd(this,h,g,h+b.offsetWidth,g+b.offsetHeight)},triggerOnKeyDown:ec(Uc),triggerOnKeyPress:ec(Xc),triggerOnKeyUp:Wc,execCommand:function(a){return Ld.hasOwnProperty(a)?Ld[a].call(null,this):void 0},triggerElectric:ec(function(a){ya(this,a)}),findPosH:function(a,b,c,d){var e=1;0>b&&(e=-1,b=-b);for(var f=0,g=Oa(this.doc,a);b>f&&(g=yd(this.doc,g,e,c,d),!g.hitSide);++f);return g},moveH:ec(function(a,b){var c=this;c.extendSelectionsBy(function(d){return c.display.shift||c.doc.extend||d.empty()?yd(c.doc,d.head,a,b,c.options.rtlMoveVisually):0>a?d.from():d.to()},Xf)}),deleteH:ec(function(a,b){var c=this.doc.sel,d=this.doc;c.somethingSelected()?d.replaceSelection("",null,"+delete"):xd(this,function(c){var e=yd(d,c.head,a,b,!1);return 0>a?{from:e,to:c.head}:{from:c.head,to:e}})}),findPosV:function(a,b,c,d){var e=1,f=d;0>b&&(e=-1,b=-b);for(var g=0,h=Oa(this.doc,a);b>g;++g){var i=Lb(this,h,"div");if(null==f?f=i.left:i.left=f,h=zd(this,i,e,c),h.hitSide)break}return h},moveV:ec(function(a,b){var c=this,d=this.doc,e=[],f=!c.display.shift&&!d.extend&&d.sel.somethingSelected();if(d.extendSelectionsBy(function(g){if(f)return 0>a?g.from():g.to();var h=Lb(c,g.head,"div");null!=g.goalColumn&&(h.left=g.goalColumn),e.push(h.left);var i=zd(c,h,a,b);return"page"==b&&g==d.sel.primary()&&sd(c,null,Kb(c,i,"div").top-h.top),i},Xf),e.length)for(var g=0;g<d.sel.ranges.length;g++)d.sel.ranges[g].goalColumn=e[g]}),findWordAt:function(a){var b=this.doc,c=ff(b,a.line).text,d=a.ch,e=a.ch;if(c){var f=this.getHelper(a,"wordChars");(a.xRel<0||e==c.length)&&d?--d:++e;for(var g=c.charAt(d),h=lg(g,f)?function(a){return lg(a,f)}:/\s/.test(g)?function(a){return/\s/.test(a)}:function(a){return!/\s/.test(a)&&!lg(a)};d>0&&h(c.charAt(d-1));)--d;for(;e<c.length&&h(c.charAt(e));)++e}return new Ka(oa(a.line,d),oa(a.line,e))},toggleOverwrite:function(a){(null==a||a!=this.state.overwrite)&&((this.state.overwrite=!this.state.overwrite)?xg(this.display.cursorDiv,"CodeMirror-overwrite"):wg(this.display.cursorDiv,"CodeMirror-overwrite"),Lf(this,"overwriteToggle",this,this.state.overwrite))},hasFocus:function(){return this.display.input.getField()==ug()},scrollTo:ec(function(a,b){(null!=a||null!=b)&&ud(this),null!=a&&(this.curOp.scrollLeft=a),null!=b&&(this.curOp.scrollTop=b)}),getScrollInfo:function(){var a=this.display.scroller;return{left:a.scrollLeft,top:a.scrollTop,height:a.scrollHeight-pb(this)-this.display.barHeight,width:a.scrollWidth-pb(this)-this.display.barWidth,clientHeight:rb(this),clientWidth:qb(this)}},scrollIntoView:ec(function(a,b){if(null==a?(a={from:this.doc.sel.primary().head,to:null},null==b&&(b=this.options.cursorScrollMargin)):"number"==typeof a?a={from:oa(a,0),to:null}:null==a.from&&(a={from:a,to:null}),a.to||(a.to=a.from),a.margin=b||0,null!=a.from.line)ud(this),this.curOp.scrollToPos=a;else{var c=rd(this,Math.min(a.from.left,a.to.left),Math.min(a.from.top,a.to.top)-a.margin,Math.max(a.from.right,a.to.right),Math.max(a.from.bottom,a.to.bottom)+a.margin);this.scrollTo(c.scrollLeft,c.scrollTop)}}),setSize:ec(function(a,b){function d(a){return"number"==typeof a||/^\d+$/.test(String(a))?a+"px":a}var c=this;null!=a&&(c.display.wrapper.style.width=d(a)),null!=b&&(c.display.wrapper.style.height=d(b)),c.options.lineWrapping&&Eb(this);var e=c.display.viewFrom;c.doc.iter(e,c.display.viewTo,function(a){if(a.widgets)for(var b=0;b<a.widgets.length;b++)if(a.widgets[b].noHScroll){jc(c,e,"widget");break}++e}),c.curOp.forceUpdate=!0,Lf(c,"refresh",this)}),operation:function(a){return cc(this,a)},refresh:ec(function(){var a=this.display.cachedTextHeight;ic(this),this.curOp.forceUpdate=!0,Fb(this),this.scrollTo(this.doc.scrollLeft,this.doc.scrollTop),F(this),(null==a||Math.abs(a-Rb(this.display))>.5)&&B(this),Lf(this,"refresh",this)}),swapDoc:ec(function(a){var b=this.doc;return b.cm=null,ef(this,a),Fb(this),this.display.input.reset(),this.scrollTo(a.scrollLeft,a.scrollTop),this.curOp.forceScroll=!0,Nf(this,"swapDoc",this,b),b}),getInputField:function(){return this.display.input.getField()},getWrapperElement:function(){return this.display.wrapper},getScrollerElement:function(){return this.display.scroller},getGutterElement:function(){return this.display.gutters}},Sf(v);var Ad=v.defaults={},Bd=v.optionHandlers={},Dd=v.Init={toString:function(){return"CodeMirror.Init"}};Cd("value","",function(a,b){a.setValue(b)},!0),Cd("mode",null,function(a,b){a.doc.modeOption=b,x(a)},!0),Cd("indentUnit",2,x,!0),Cd("indentWithTabs",!1),Cd("smartIndent",!0),Cd("tabSize",4,function(a){y(a),Fb(a),ic(a)},!0),Cd("lineSeparator",null,function(a,b){if(a.doc.lineSep=b,b){var c=[],d=a.doc.first;a.doc.iter(function(a){for(var e=0;;){var f=a.text.indexOf(b,e);if(-1==f)break;e=f+b.length,c.push(oa(d,f))}d++});for(var e=c.length-1;e>=0;e--)nd(a.doc,b,c[e],oa(c[e].line,c[e].ch+b.length))}}),Cd("specialChars",/[\t\u0000-\u0019\u00ad\u200b-\u200f\u2028\u2029\ufeff]/g,function(a,b,c){a.state.specialChars=new RegExp(b.source+(b.test("	")?"":"|	"),"g"),c!=v.Init&&a.refresh()}),Cd("specialCharPlaceholder",Re,function(a){a.refresh()},!0),Cd("electricChars",!0),Cd("inputStyle",n?"contenteditable":"textarea",function(){throw new Error("inputStyle can not (yet) be changed in a running editor")},!0),Cd("rtlMoveVisually",!p),Cd("wholeLineUpdateBefore",!0),Cd("theme","default",function(a){C(a),D(a)},!0),Cd("keyMap","default",function(a,b,c){var d=Rd(b),e=c!=v.Init&&Rd(c);e&&e.detach&&e.detach(a,d),d.attach&&d.attach(a,e||null)}),Cd("extraKeys",null),Cd("lineWrapping",!1,z,!0),Cd("gutters",[],function(a){I(a.options),D(a)},!0),Cd("fixedGutter",!0,function(a,b){a.display.gutters.style.left=b?T(a.display)+"px":"0",a.refresh()},!0),Cd("coverGutterNextToScrollbar",!1,function(a){N(a)},!0),Cd("scrollbarStyle","native",function(a){M(a),N(a),a.display.scrollbars.setScrollTop(a.doc.scrollTop),a.display.scrollbars.setScrollLeft(a.doc.scrollLeft)},!0),Cd("lineNumbers",!1,function(a){I(a.options),D(a)},!0),Cd("firstLineNumber",1,D,!0),Cd("lineNumberFormatter",function(a){return a},D,!0),Cd("showCursorWhenSelecting",!1,db,!0),Cd("resetSelectionOnContextMenu",!0),Cd("lineWiseCopyCut",!0),Cd("readOnly",!1,function(a,b){"nocursor"==b?($c(a),a.display.input.blur(),a.display.disabled=!0):(a.display.disabled=!1,b||a.display.input.reset())}),Cd("disableInput",!1,function(a,b){b||a.display.input.reset()},!0),Cd("dragDrop",!0,qc),Cd("cursorBlinkRate",530),Cd("cursorScrollMargin",0),Cd("cursorHeight",1,db,!0),Cd("singleCursorHeightPerLine",!0,db,!0),Cd("workTime",100),Cd("workDelay",100),Cd("flattenSpans",!0,y,!0),Cd("addModeClass",!1,y,!0),Cd("pollInterval",100),Cd("undoDepth",200,function(a,b){a.doc.history.undoDepth=b}),Cd("historyEventDelay",1250),Cd("viewportMargin",10,function(a){a.refresh()},!0),Cd("maxHighlightLength",1e4,y,!0),Cd("moveInputWithCursor",!0,function(a,b){b||a.display.input.resetPosition()}),Cd("tabindex",null,function(a,b){a.display.input.getField().tabIndex=b||""}),Cd("autofocus",null);var Ed=v.modes={},Fd=v.mimeModes={};v.defineMode=function(a,b){v.defaults.mode||"null"==a||(v.defaults.mode=a),arguments.length>2&&(b.dependencies=Array.prototype.slice.call(arguments,2)),Ed[a]=b},v.defineMIME=function(a,b){Fd[a]=b},v.resolveMode=function(a){if("string"==typeof a&&Fd.hasOwnProperty(a))a=Fd[a];else if(a&&"string"==typeof a.name&&Fd.hasOwnProperty(a.name)){var b=Fd[a.name];"string"==typeof b&&(b={name:b}),a=gg(b,a),a.name=b.name}else if("string"==typeof a&&/^[\w\-]+\/[\w\-]+\+xml$/.test(a))return v.resolveMode("application/xml");return"string"==typeof a?{name:a}:a||{name:"null"}},v.getMode=function(a,b){var b=v.resolveMode(b),c=Ed[b.name];if(!c)return v.getMode(a,"text/plain");var d=c(a,b);if(Gd.hasOwnProperty(b.name)){var e=Gd[b.name];for(var f in e)e.hasOwnProperty(f)&&(d.hasOwnProperty(f)&&(d["_"+f]=d[f]),d[f]=e[f])}if(d.name=b.name,b.helperType&&(d.helperType=b.helperType),b.modeProps)for(var f in b.modeProps)d[f]=b.modeProps[f];return d},v.defineMode("null",function(){return{token:function(a){a.skipToEnd()}}}),v.defineMIME("text/plain","null");var Gd=v.modeExtensions={};v.extendMode=function(a,b){var c=Gd.hasOwnProperty(a)?Gd[a]:Gd[a]={};hg(b,c)},v.defineExtension=function(a,b){v.prototype[a]=b},v.defineDocExtension=function(a,b){af.prototype[a]=b},v.defineOption=Cd;var Hd=[];v.defineInitHook=function(a){Hd.push(a)};var Id=v.helpers={};v.registerHelper=function(a,b,c){Id.hasOwnProperty(a)||(Id[a]=v[a]={_global:[]}),Id[a][b]=c},v.registerGlobalHelper=function(a,b,c,d){v.registerHelper(a,b,d),Id[a]._global.push({pred:c,val:d})};var Jd=v.copyState=function(a,b){if(b===!0)return b;if(a.copyState)return a.copyState(b);var c={};for(var d in b){var e=b[d];e instanceof Array&&(e=e.concat([])),c[d]=e}return c},Kd=v.startState=function(a,b,c){return a.startState?a.startState(b,c):!0};v.innerMode=function(a,b){for(;a.innerMode;){var c=a.innerMode(b);if(!c||c.mode==a)break;b=c.state,a=c.mode}return c||{mode:a,state:b}};var 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h(b).offset!=c}function C(a,b){var c=b.tokenize(a,b),d=a.current();if("."==d)return c=a.match(q,!1)?null:k,null==c&&"meta"==b.lastStyle&&(c="meta"),c;if("@"==d)return j.version&&3==parseInt(j.version,10)?a.match(q,!1)?"meta":"operator":a.match(q,!1)?"meta":k;"variable"!=c&&"builtin"!=c||"meta"!=b.lastStyle||(c="meta"),("pass"==d||"return"==d)&&(b.dedent+=1),"lambda"==d&&(b.lambda=!0),":"!=d||b.lambda||"py"!=h(b).type||A(a,b,"py");var e=1==d.length?"[({".indexOf(d):-1;if(-1!=e&&A(a,b,"])}".slice(e,e+1)),e="])}".indexOf(d),-1!=e){if(h(b).type!=d)return k;b.scopes.pop()}return b.dedent>0&&a.eol()&&"py"==h(b).type&&(b.scopes.length>1&&b.scopes.pop(),b.dedent-=1),c}var k="error",l=j.singleDelimiters||new RegExp("^[\\(\\)\\[\\]\\{\\}@,:`=;\\.]"),m=j.doubleOperators||new RegExp("^((==)|(!=)|(<=)|(>=)|(<>)|(<<)|(>>)|(//)|(\\*\\*))"),n=j.doubleDelimiters||new RegExp("^((\\+=)|(\\-=)|(\\*=)|(%=)|(/=)|(&=)|(\\|=)|(\\^=))"),o=j.tripleDelimiters||new RegExp("^((//=)|(>>=)|(<<=)|(\\*\\*=))");if(j.version&&3==parseInt(j.version,10))var p=j.singleOperators||new RegExp("^[\\+\\-\\*/%&|\\^~<>!@]"),q=j.identifiers||new RegExp("^[_A-Za-z\xa1-\uffff][_A-Za-z0-9\xa1-\uffff]*");else var p=j.singleOperators||new RegExp("^[\\+\\-\\*/%&|\\^~<>!]"),q=j.identifiers||new RegExp("^[_A-Za-z][_A-Za-z0-9]*");var r=j.hangingIndent||i.indentUnit,s=d,t=e;if(void 0!=j.extra_keywords&&(s=s.concat(j.extra_keywords)),void 0!=j.extra_builtins&&(t=t.concat(j.extra_builtins)),j.version&&3==parseInt(j.version,10)){s=s.concat(g.keywords),t=t.concat(g.builtins);var u=new RegExp("^(([rb]|(br))?('{3}|\"{3}|['\"]))","i")}else{s=s.concat(f.keywords),t=t.concat(f.builtins);var u=new RegExp("^(([rub]|(ur)|(br))?('{3}|\"{3}|['\"]))","i")}var v=b(s),w=b(t),D={startState:function(a){return{tokenize:x,scopes:[{offset:a||0,type:"py",align:null}],lastStyle:null,lastToken:null,lambda:!1,dedent:0}},token:function(a,b){var c=b.errorToken;c&&(b.errorToken=!1);var d=C(a,b);b.lastStyle=d;var e=a.current();return e&&d&&(b.lastToken=e),a.eol()&&b.lambda&&(b.lambda=!1),c?d+" "+k:d},indent:function(b,c){if(b.tokenize!=x)return b.tokenize.isString?a.Pass:0;var d=h(b),e=c&&c.charAt(0)==d.type;return null!=d.align?d.align-(e?1:0):e&&b.scopes.length>1?b.scopes[b.scopes.length-2].offset:d.offset},closeBrackets:{triples:"'\""},lineComment:"#",fold:"indent"};return D}),a.defineMIME("text/x-python","python");var i=function(a){return a.split(" ")};a.defineMIME("text/x-cython",{name:"python",extra_keywords:i("by cdef cimport cpdef ctypedef enum exceptextern gil include nogil property publicreadonly struct union DEF IF ELIF ELSE")})}),function(a){"object"==typeof exports&&"object"==typeof module?a(require("../../lib/codemirror")):"function"==typeof define&&define.amd?define(["../../lib/codemirror"],a):a(CodeMirror)}(function(a){"use strict";a.defineMode("ruby",function(a){function b(a){for(var b={},c=0,d=a.length;d>c;++c)b[a[c]]=!0;return b}function h(a,b,c){return c.tokenize.push(a),a(b,c)}function i(a,b){if(a.sol()&&a.match("=begin")&&a.eol())return b.tokenize.push(n),"comment";if(a.eatSpace())return null;var d,c=a.next();if("`"==c||"'"==c||'"'==c)return h(l(c,"string",'"'==c||"`"==c),a,b);if("/"==c){var e=a.current().length;if(a.skipTo("/")){var i=a.current().length;a.backUp(a.current().length-e);for(var j=0;a.current().length<i;){var k=a.next();if("("==k?j+=1:")"==k&&(j-=1),0>j)break}if(a.backUp(a.current().length-e),0==j)return h(l(c,"string-2",!0),a,b)}return"operator"}if("%"==c){var o="string",p=!0;a.eat("s")?o="atom":a.eat(/[WQ]/)?o="string":a.eat(/[r]/)?o="string-2":a.eat(/[wxq]/)&&(o="string",p=!1);var q=a.eat(/[^\w\s=]/);return q?(f.propertyIsEnumerable(q)&&(q=f[q]),h(l(q,o,p,!0),a,b)):"operator"}if("#"==c)return a.skipToEnd(),"comment";if("<"==c&&(d=a.match(/^<-?[\`\"\']?([a-zA-Z_?]\w*)[\`\"\']?(?:;|$)/)))return h(m(d[1]),a,b);if("0"==c)return a.eat("x")?a.eatWhile(/[\da-fA-F]/):a.eat("b")?a.eatWhile(/[01]/):a.eatWhile(/[0-7]/),"number";if(/\d/.test(c))return a.match(/^[\d_]*(?:\.[\d_]+)?(?:[eE][+\-]?[\d_]+)?/),"number";if("?"==c){for(;a.match(/^\\[CM]-/););return a.eat("\\")?a.eatWhile(/\w/):a.next(),"string"}if(":"==c)return a.eat("'")?h(l("'","atom",!1),a,b):a.eat('"')?h(l('"',"atom",!0),a,b):a.eat(/[\<\>]/)?(a.eat(/[\<\>]/),"atom"):a.eat(/[\+\-\*\/\&\|\:\!]/)?"atom":a.eat(/[a-zA-Z$@_\xa1-\uffff]/)?(a.eatWhile(/[\w$\xa1-\uffff]/),a.eat(/[\?\!\=]/),"atom"):"operator";if("@"==c&&a.match(/^@?[a-zA-Z_\xa1-\uffff]/))return a.eat("@"),a.eatWhile(/[\w\xa1-\uffff]/),"variable-2";if("$"==c)return a.eat(/[a-zA-Z_]/)?a.eatWhile(/[\w]/):a.eat(/\d/)?a.eat(/\d/):a.next(),"variable-3";if(/[a-zA-Z_\xa1-\uffff]/.test(c))return a.eatWhile(/[\w\xa1-\uffff]/),a.eat(/[\?\!]/),a.eat(":")?"atom":"ident";if("|"!=c||!b.varList&&"{"!=b.lastTok&&"do"!=b.lastTok){if(/[\(\)\[\]{}\\;]/.test(c))return g=c,null;if("-"==c&&a.eat(">"))return"arrow";if(/[=+\-\/*:\.^%<>~|]/.test(c)){var r=a.eatWhile(/[=+\-\/*:\.^%<>~|]/);return"."!=c||r||(g="."),"operator"}return null}return g="|",null}function j(a){return a||(a=1),function(b,c){if("}"==b.peek()){if(1==a)return c.tokenize.pop(),c.tokenize[c.tokenize.length-1](b,c);c.tokenize[c.tokenize.length-1]=j(a-1)}else"{"==b.peek()&&(c.tokenize[c.tokenize.length-1]=j(a+1));return i(b,c)}}function k(){var a=!1;return function(b,c){return a?(c.tokenize.pop(),c.tokenize[c.tokenize.length-1](b,c)):(a=!0,i(b,c))}}function l(a,b,c,d){return function(e,f){var h,g=!1;for("read-quoted-paused"===f.context.type&&(f.context=f.context.prev,e.eat("}"));null!=(h=e.next());){if(h==a&&(d||!g)){f.tokenize.pop();break}if(c&&"#"==h&&!g){if(e.eat("{")){"}"==a&&(f.context={prev:f.context,type:"read-quoted-paused"}),f.tokenize.push(j());break}if(/[@\$]/.test(e.peek())){f.tokenize.push(k());break}}g=!g&&"\\"==h}return b}}function m(a){return function(b,c){return b.match(a)?c.tokenize.pop():b.skipToEnd(),"string"}}function n(a,b){return a.sol()&&a.match("=end")&&a.eol()&&b.tokenize.pop(),a.skipToEnd(),"comment"}var g,c=b(["alias","and","BEGIN","begin","break","case","class","def","defined?","do","else","elsif","END","end","ensure","false","for","if","in","module","next","not","or","redo","rescue","retry","return","self","super","then","true","undef","unless","until","when","while","yield","nil","raise","throw","catch","fail","loop","callcc","caller","lambda","proc","public","protected","private","require","load","require_relative","extend","autoload","__END__","__FILE__","__LINE__","__dir__"]),d=b(["def","class","case","for","while","module","then","catch","loop","proc","begin"]),e=b(["end","until"]),f={"[":"]","{":"}","(":")"};return{startState:function(){return{tokenize:[i],indented:0,context:{type:"top",indented:-a.indentUnit},continuedLine:!1,lastTok:null,varList:!1}},token:function(a,b){g=null,a.sol()&&(b.indented=a.indentation());var h,f=b.tokenize[b.tokenize.length-1](a,b),i=g;if("ident"==f){var j=a.current();f="."==b.lastTok?"property":c.propertyIsEnumerable(a.current())?"keyword":/^[A-Z]/.test(j)?"tag":"def"==b.lastTok||"class"==b.lastTok||b.varList?"def":"variable","keyword"==f&&(i=j,d.propertyIsEnumerable(j)?h="indent":e.propertyIsEnumerable(j)?h="dedent":"if"!=j&&"unless"!=j||a.column()!=a.indentation()?"do"==j&&b.context.indented<b.indented&&(h="indent"):h="indent")}return(g||f&&"comment"!=f)&&(b.lastTok=i),"|"==g&&(b.varList=!b.varList),"indent"==h||/[\(\[\{]/.test(g)?b.context={prev:b.context,type:g||f,indented:b.indented}:("dedent"==h||/[\)\]\}]/.test(g))&&b.context.prev&&(b.context=b.context.prev),a.eol()&&(b.continuedLine="\\"==g||"operator"==f),f},indent:function(b,c){if(b.tokenize[b.tokenize.length-1]!=i)return 0;var d=c&&c.charAt(0),e=b.context,g=e.type==f[d]||"keyword"==e.type&&/^(?:end|until|else|elsif|when|rescue)\b/.test(c);return 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\ No newline at end of file
diff --git a/public/assets/codemirror/python.js b/public/assets/codemirror/python.js
new file mode 100644
index 000000000..e5a09719b
--- /dev/null
+++ b/public/assets/codemirror/python.js
@@ -0,0 +1,358 @@
+// CodeMirror, copyright (c) by Marijn Haverbeke and others
+// Distributed under an MIT license: http://codemirror.net/LICENSE
+
+(function(mod) {
+  if (typeof exports == "object" && typeof module == "object") // CommonJS
+    mod(require("../../lib/codemirror"));
+  else if (typeof define == "function" && define.amd) // AMD
+    define(["../../lib/codemirror"], mod);
+  else // Plain browser env
+    mod(CodeMirror);
+})(function(CodeMirror) {
+  "use strict";
+
+  function wordRegexp(words) {
+    return new RegExp("^((" + words.join(")|(") + "))\\b");
+  }
+
+  var wordOperators = wordRegexp(["and", "or", "not", "is"]);
+  var commonKeywords = ["as", "assert", "break", "class", "continue",
+                        "def", "del", "elif", "else", "except", "finally",
+                        "for", "from", "global", "if", "import",
+                        "lambda", "pass", "raise", "return",
+                        "try", "while", "with", "yield", "in"];
+  var commonBuiltins = ["abs", "all", "any", "bin", "bool", "bytearray", "callable", "chr",
+                        "classmethod", "compile", "complex", "delattr", "dict", "dir", "divmod",
+                        "enumerate", "eval", "filter", "float", "format", "frozenset",
+                        "getattr", "globals", "hasattr", "hash", "help", "hex", "id",
+                        "input", "int", "isinstance", "issubclass", "iter", "len",
+                        "list", "locals", "map", "max", "memoryview", "min", "next",
+                        "object", "oct", "open", "ord", "pow", "property", "range",
+                        "repr", "reversed", "round", "set", "setattr", "slice",
+                        "sorted", "staticmethod", "str", "sum", "super", "tuple",
+                        "type", "vars", "zip", "__import__", "NotImplemented",
+                        "Ellipsis", "__debug__"];
+  var py2 = {builtins: ["apply", "basestring", "buffer", "cmp", "coerce", "execfile",
+                        "file", "intern", "long", "raw_input", "reduce", "reload",
+                        "unichr", "unicode", "xrange", "False", "True", "None"],
+             keywords: ["exec", "print"]};
+  var py3 = {builtins: ["ascii", "bytes", "exec", "print"],
+             keywords: ["nonlocal", "False", "True", "None", "async", "await"]};
+
+  CodeMirror.registerHelper("hintWords", "python", commonKeywords.concat(commonBuiltins));
+
+  function top(state) {
+    return state.scopes[state.scopes.length - 1];
+  }
+
+  CodeMirror.defineMode("python", function(conf, parserConf) {
+    var ERRORCLASS = "error";
+
+    var singleDelimiters = parserConf.singleDelimiters || new RegExp("^[\\(\\)\\[\\]\\{\\}@,:`=;\\.]");
+    var doubleOperators = parserConf.doubleOperators || new RegExp("^((==)|(!=)|(<=)|(>=)|(<>)|(<<)|(>>)|(//)|(\\*\\*))");
+    var doubleDelimiters = parserConf.doubleDelimiters || new RegExp("^((\\+=)|(\\-=)|(\\*=)|(%=)|(/=)|(&=)|(\\|=)|(\\^=))");
+    var tripleDelimiters = parserConf.tripleDelimiters || new RegExp("^((//=)|(>>=)|(<<=)|(\\*\\*=))");
+
+    if (parserConf.version && parseInt(parserConf.version, 10) == 3){
+        // since http://legacy.python.org/dev/peps/pep-0465/ @ is also an operator
+        var singleOperators = parserConf.singleOperators || new RegExp("^[\\+\\-\\*/%&|\\^~<>!@]");
+        var identifiers = parserConf.identifiers|| new RegExp("^[_A-Za-z\u00A1-\uFFFF][_A-Za-z0-9\u00A1-\uFFFF]*");
+    } else {
+        var singleOperators = parserConf.singleOperators || new RegExp("^[\\+\\-\\*/%&|\\^~<>!]");
+        var identifiers = parserConf.identifiers|| new RegExp("^[_A-Za-z][_A-Za-z0-9]*");
+    }
+
+    var hangingIndent = parserConf.hangingIndent || conf.indentUnit;
+
+    var myKeywords = commonKeywords, myBuiltins = commonBuiltins;
+    if(parserConf.extra_keywords != undefined){
+      myKeywords = myKeywords.concat(parserConf.extra_keywords);
+    }
+    if(parserConf.extra_builtins != undefined){
+      myBuiltins = myBuiltins.concat(parserConf.extra_builtins);
+    }
+    if (parserConf.version && parseInt(parserConf.version, 10) == 3) {
+      myKeywords = myKeywords.concat(py3.keywords);
+      myBuiltins = myBuiltins.concat(py3.builtins);
+      var stringPrefixes = new RegExp("^(([rb]|(br))?('{3}|\"{3}|['\"]))", "i");
+    } else {
+      myKeywords = myKeywords.concat(py2.keywords);
+      myBuiltins = myBuiltins.concat(py2.builtins);
+      var stringPrefixes = new RegExp("^(([rub]|(ur)|(br))?('{3}|\"{3}|['\"]))", "i");
+    }
+    var keywords = wordRegexp(myKeywords);
+    var builtins = wordRegexp(myBuiltins);
+
+    // tokenizers
+    function tokenBase(stream, state) {
+      // Handle scope changes
+      if (stream.sol() && top(state).type == "py") {
+        var scopeOffset = top(state).offset;
+        if (stream.eatSpace()) {
+          var lineOffset = stream.indentation();
+          if (lineOffset > scopeOffset)
+            pushScope(stream, state, "py");
+          else if (lineOffset < scopeOffset && dedent(stream, state))
+            state.errorToken = true;
+          return null;
+        } else {
+          var style = tokenBaseInner(stream, state);
+          if (scopeOffset > 0 && dedent(stream, state))
+            style += " " + ERRORCLASS;
+          return style;
+        }
+      }
+      return tokenBaseInner(stream, state);
+    }
+
+    function tokenBaseInner(stream, state) {
+      if (stream.eatSpace()) return null;
+
+      var ch = stream.peek();
+
+      // Handle Comments
+      if (ch == "#") {
+        stream.skipToEnd();
+        return "comment";
+      }
+
+      // Handle Number Literals
+      if (stream.match(/^[0-9\.]/, false)) {
+        var floatLiteral = false;
+        // Floats
+        if (stream.match(/^\d*\.\d+(e[\+\-]?\d+)?/i)) { floatLiteral = true; }
+        if (stream.match(/^\d+\.\d*/)) { floatLiteral = true; }
+        if (stream.match(/^\.\d+/)) { floatLiteral = true; }
+        if (floatLiteral) {
+          // Float literals may be "imaginary"
+          stream.eat(/J/i);
+          return "number";
+        }
+        // Integers
+        var intLiteral = false;
+        // Hex
+        if (stream.match(/^0x[0-9a-f]+/i)) intLiteral = true;
+        // Binary
+        if (stream.match(/^0b[01]+/i)) intLiteral = true;
+        // Octal
+        if (stream.match(/^0o[0-7]+/i)) intLiteral = true;
+        // Decimal
+        if (stream.match(/^[1-9]\d*(e[\+\-]?\d+)?/)) {
+          // Decimal literals may be "imaginary"
+          stream.eat(/J/i);
+          // TODO - Can you have imaginary longs?
+          intLiteral = true;
+        }
+        // Zero by itself with no other piece of number.
+        if (stream.match(/^0(?![\dx])/i)) intLiteral = true;
+        if (intLiteral) {
+          // Integer literals may be "long"
+          stream.eat(/L/i);
+          return "number";
+        }
+      }
+
+      // Handle Strings
+      if (stream.match(stringPrefixes)) {
+        state.tokenize = tokenStringFactory(stream.current());
+        return state.tokenize(stream, state);
+      }
+
+      // Handle operators and Delimiters
+      if (stream.match(tripleDelimiters) || stream.match(doubleDelimiters))
+        return null;
+
+      if (stream.match(doubleOperators) || stream.match(singleOperators))
+        return "operator";
+
+      if (stream.match(singleDelimiters))
+        return null;
+
+      if (stream.match(keywords) || stream.match(wordOperators))
+        return "keyword";
+
+      if (stream.match(builtins))
+        return "builtin";
+
+      if (stream.match(/^(self|cls)\b/))
+        return "variable-2";
+
+      if (stream.match(identifiers)) {
+        if (state.lastToken == "def" || state.lastToken == "class")
+          return "def";
+        return "variable";
+      }
+
+      // Handle non-detected items
+      stream.next();
+      return ERRORCLASS;
+    }
+
+    function tokenStringFactory(delimiter) {
+      while ("rub".indexOf(delimiter.charAt(0).toLowerCase()) >= 0)
+        delimiter = delimiter.substr(1);
+
+      var singleline = delimiter.length == 1;
+      var OUTCLASS = "string";
+
+      function tokenString(stream, state) {
+        while (!stream.eol()) {
+          stream.eatWhile(/[^'"\\]/);
+          if (stream.eat("\\")) {
+            stream.next();
+            if (singleline && stream.eol())
+              return OUTCLASS;
+          } else if (stream.match(delimiter)) {
+            state.tokenize = tokenBase;
+            return OUTCLASS;
+          } else {
+            stream.eat(/['"]/);
+          }
+        }
+        if (singleline) {
+          if (parserConf.singleLineStringErrors)
+            return ERRORCLASS;
+          else
+            state.tokenize = tokenBase;
+        }
+        return OUTCLASS;
+      }
+      tokenString.isString = true;
+      return tokenString;
+    }
+
+    function pushScope(stream, state, type) {
+      var offset = 0, align = null;
+      if (type == "py") {
+        while (top(state).type != "py")
+          state.scopes.pop();
+      }
+      offset = top(state).offset + (type == "py" ? conf.indentUnit : hangingIndent);
+      if (type != "py" && !stream.match(/^(\s|#.*)*$/, false))
+        align = stream.column() + 1;
+      state.scopes.push({offset: offset, type: type, align: align});
+    }
+
+    function dedent(stream, state) {
+      var indented = stream.indentation();
+      while (top(state).offset > indented) {
+        if (top(state).type != "py") return true;
+        state.scopes.pop();
+      }
+      return top(state).offset != indented;
+    }
+
+    function tokenLexer(stream, state) {
+      var style = state.tokenize(stream, state);
+      var current = stream.current();
+
+      // Handle '.' connected identifiers
+      if (current == ".") {
+        style = stream.match(identifiers, false) ? null : ERRORCLASS;
+        if (style == null && state.lastStyle == "meta") {
+          // Apply 'meta' style to '.' connected identifiers when
+          // appropriate.
+          style = "meta";
+        }
+        return style;
+      }
+
+      // Handle decorators
+      if (current == "@"){
+        if(parserConf.version && parseInt(parserConf.version, 10) == 3){
+            return stream.match(identifiers, false) ? "meta" : "operator";
+        } else {
+            return stream.match(identifiers, false) ? "meta" : ERRORCLASS;
+        }
+      }
+
+      if ((style == "variable" || style == "builtin")
+          && state.lastStyle == "meta")
+        style = "meta";
+
+      // Handle scope changes.
+      if (current == "pass" || current == "return")
+        state.dedent += 1;
+
+      if (current == "lambda") state.lambda = true;
+      if (current == ":" && !state.lambda && top(state).type == "py")
+        pushScope(stream, state, "py");
+
+      var delimiter_index = current.length == 1 ? "[({".indexOf(current) : -1;
+      if (delimiter_index != -1)
+        pushScope(stream, state, "])}".slice(delimiter_index, delimiter_index+1));
+
+      delimiter_index = "])}".indexOf(current);
+      if (delimiter_index != -1) {
+        if (top(state).type == current) state.scopes.pop();
+        else return ERRORCLASS;
+      }
+      if (state.dedent > 0 && stream.eol() && top(state).type == "py") {
+        if (state.scopes.length > 1) state.scopes.pop();
+        state.dedent -= 1;
+      }
+
+      return style;
+    }
+
+    var external = {
+      startState: function(basecolumn) {
+        return {
+          tokenize: tokenBase,
+          scopes: [{offset: basecolumn || 0, type: "py", align: null}],
+          lastStyle: null,
+          lastToken: null,
+          lambda: false,
+          dedent: 0
+        };
+      },
+
+      token: function(stream, state) {
+        var addErr = state.errorToken;
+        if (addErr) state.errorToken = false;
+        var style = tokenLexer(stream, state);
+
+        state.lastStyle = style;
+
+        var current = stream.current();
+        if (current && style)
+          state.lastToken = current;
+
+        if (stream.eol() && state.lambda)
+          state.lambda = false;
+        return addErr ? style + " " + ERRORCLASS : style;
+      },
+
+      indent: function(state, textAfter) {
+        if (state.tokenize != tokenBase)
+          return state.tokenize.isString ? CodeMirror.Pass : 0;
+
+        var scope = top(state);
+        var closing = textAfter && textAfter.charAt(0) == scope.type;
+        if (scope.align != null)
+          return scope.align - (closing ? 1 : 0);
+        else if (closing && state.scopes.length > 1)
+          return state.scopes[state.scopes.length - 2].offset;
+        else
+          return scope.offset;
+      },
+
+      closeBrackets: {triples: "'\""},
+      lineComment: "#",
+      fold: "indent"
+    };
+    return external;
+  });
+
+  CodeMirror.defineMIME("text/x-python", "python");
+
+  var words = function(str) { return str.split(" "); };
+
+  CodeMirror.defineMIME("text/x-cython", {
+    name: "python",
+    extra_keywords: words("by cdef cimport cpdef ctypedef enum except"+
+                          "extern gil include nogil property public"+
+                          "readonly struct union DEF IF ELIF ELSE")
+  });
+
+});
diff --git a/public/assets/codemirror/ruby.js b/public/assets/codemirror/ruby.js
new file mode 100644
index 000000000..771f855ab
--- /dev/null
+++ b/public/assets/codemirror/ruby.js
@@ -0,0 +1,285 @@
+// CodeMirror, copyright (c) by Marijn Haverbeke and others
+// Distributed under an MIT license: http://codemirror.net/LICENSE
+
+(function(mod) {
+  if (typeof exports == "object" && typeof module == "object") // CommonJS
+    mod(require("../../lib/codemirror"));
+  else if (typeof define == "function" && define.amd) // AMD
+    define(["../../lib/codemirror"], mod);
+  else // Plain browser env
+    mod(CodeMirror);
+})(function(CodeMirror) {
+"use strict";
+
+CodeMirror.defineMode("ruby", function(config) {
+  function wordObj(words) {
+    var o = {};
+    for (var i = 0, e = words.length; i < e; ++i) o[words[i]] = true;
+    return o;
+  }
+  var keywords = wordObj([
+    "alias", "and", "BEGIN", "begin", "break", "case", "class", "def", "defined?", "do", "else",
+    "elsif", "END", "end", "ensure", "false", "for", "if", "in", "module", "next", "not", "or",
+    "redo", "rescue", "retry", "return", "self", "super", "then", "true", "undef", "unless",
+    "until", "when", "while", "yield", "nil", "raise", "throw", "catch", "fail", "loop", "callcc",
+    "caller", "lambda", "proc", "public", "protected", "private", "require", "load",
+    "require_relative", "extend", "autoload", "__END__", "__FILE__", "__LINE__", "__dir__"
+  ]);
+  var indentWords = wordObj(["def", "class", "case", "for", "while", "module", "then",
+                             "catch", "loop", "proc", "begin"]);
+  var dedentWords = wordObj(["end", "until"]);
+  var matching = {"[": "]", "{": "}", "(": ")"};
+  var curPunc;
+
+  function chain(newtok, stream, state) {
+    state.tokenize.push(newtok);
+    return newtok(stream, state);
+  }
+
+  function tokenBase(stream, state) {
+    if (stream.sol() && stream.match("=begin") && stream.eol()) {
+      state.tokenize.push(readBlockComment);
+      return "comment";
+    }
+    if (stream.eatSpace()) return null;
+    var ch = stream.next(), m;
+    if (ch == "`" || ch == "'" || ch == '"') {
+      return chain(readQuoted(ch, "string", ch == '"' || ch == "`"), stream, state);
+    } else if (ch == "/") {
+      var currentIndex = stream.current().length;
+      if (stream.skipTo("/")) {
+        var search_till = stream.current().length;
+        stream.backUp(stream.current().length - currentIndex);
+        var balance = 0;  // balance brackets
+        while (stream.current().length < search_till) {
+          var chchr = stream.next();
+          if (chchr == "(") balance += 1;
+          else if (chchr == ")") balance -= 1;
+          if (balance < 0) break;
+        }
+        stream.backUp(stream.current().length - currentIndex);
+        if (balance == 0)
+          return chain(readQuoted(ch, "string-2", true), stream, state);
+      }
+      return "operator";
+    } else if (ch == "%") {
+      var style = "string", embed = true;
+      if (stream.eat("s")) style = "atom";
+      else if (stream.eat(/[WQ]/)) style = "string";
+      else if (stream.eat(/[r]/)) style = "string-2";
+      else if (stream.eat(/[wxq]/)) { style = "string"; embed = false; }
+      var delim = stream.eat(/[^\w\s=]/);
+      if (!delim) return "operator";
+      if (matching.propertyIsEnumerable(delim)) delim = matching[delim];
+      return chain(readQuoted(delim, style, embed, true), stream, state);
+    } else if (ch == "#") {
+      stream.skipToEnd();
+      return "comment";
+    } else if (ch == "<" && (m = stream.match(/^<-?[\`\"\']?([a-zA-Z_?]\w*)[\`\"\']?(?:;|$)/))) {
+      return chain(readHereDoc(m[1]), stream, state);
+    } else if (ch == "0") {
+      if (stream.eat("x")) stream.eatWhile(/[\da-fA-F]/);
+      else if (stream.eat("b")) stream.eatWhile(/[01]/);
+      else stream.eatWhile(/[0-7]/);
+      return "number";
+    } else if (/\d/.test(ch)) {
+      stream.match(/^[\d_]*(?:\.[\d_]+)?(?:[eE][+\-]?[\d_]+)?/);
+      return "number";
+    } else if (ch == "?") {
+      while (stream.match(/^\\[CM]-/)) {}
+      if (stream.eat("\\")) stream.eatWhile(/\w/);
+      else stream.next();
+      return "string";
+    } else if (ch == ":") {
+      if (stream.eat("'")) return chain(readQuoted("'", "atom", false), stream, state);
+      if (stream.eat('"')) return chain(readQuoted('"', "atom", true), stream, state);
+
+      // :> :>> :< :<< are valid symbols
+      if (stream.eat(/[\<\>]/)) {
+        stream.eat(/[\<\>]/);
+        return "atom";
+      }
+
+      // :+ :- :/ :* :| :& :! are valid symbols
+      if (stream.eat(/[\+\-\*\/\&\|\:\!]/)) {
+        return "atom";
+      }
+
+      // Symbols can't start by a digit
+      if (stream.eat(/[a-zA-Z$@_\xa1-\uffff]/)) {
+        stream.eatWhile(/[\w$\xa1-\uffff]/);
+        // Only one ? ! = is allowed and only as the last character
+        stream.eat(/[\?\!\=]/);
+        return "atom";
+      }
+      return "operator";
+    } else if (ch == "@" && stream.match(/^@?[a-zA-Z_\xa1-\uffff]/)) {
+      stream.eat("@");
+      stream.eatWhile(/[\w\xa1-\uffff]/);
+      return "variable-2";
+    } else if (ch == "$") {
+      if (stream.eat(/[a-zA-Z_]/)) {
+        stream.eatWhile(/[\w]/);
+      } else if (stream.eat(/\d/)) {
+        stream.eat(/\d/);
+      } else {
+        stream.next(); // Must be a special global like $: or $!
+      }
+      return "variable-3";
+    } else if (/[a-zA-Z_\xa1-\uffff]/.test(ch)) {
+      stream.eatWhile(/[\w\xa1-\uffff]/);
+      stream.eat(/[\?\!]/);
+      if (stream.eat(":")) return "atom";
+      return "ident";
+    } else if (ch == "|" && (state.varList || state.lastTok == "{" || state.lastTok == "do")) {
+      curPunc = "|";
+      return null;
+    } else if (/[\(\)\[\]{}\\;]/.test(ch)) {
+      curPunc = ch;
+      return null;
+    } else if (ch == "-" && stream.eat(">")) {
+      return "arrow";
+    } else if (/[=+\-\/*:\.^%<>~|]/.test(ch)) {
+      var more = stream.eatWhile(/[=+\-\/*:\.^%<>~|]/);
+      if (ch == "." && !more) curPunc = ".";
+      return "operator";
+    } else {
+      return null;
+    }
+  }
+
+  function tokenBaseUntilBrace(depth) {
+    if (!depth) depth = 1;
+    return function(stream, state) {
+      if (stream.peek() == "}") {
+        if (depth == 1) {
+          state.tokenize.pop();
+          return state.tokenize[state.tokenize.length-1](stream, state);
+        } else {
+          state.tokenize[state.tokenize.length - 1] = tokenBaseUntilBrace(depth - 1);
+        }
+      } else if (stream.peek() == "{") {
+        state.tokenize[state.tokenize.length - 1] = tokenBaseUntilBrace(depth + 1);
+      }
+      return tokenBase(stream, state);
+    };
+  }
+  function tokenBaseOnce() {
+    var alreadyCalled = false;
+    return function(stream, state) {
+      if (alreadyCalled) {
+        state.tokenize.pop();
+        return state.tokenize[state.tokenize.length-1](stream, state);
+      }
+      alreadyCalled = true;
+      return tokenBase(stream, state);
+    };
+  }
+  function readQuoted(quote, style, embed, unescaped) {
+    return function(stream, state) {
+      var escaped = false, ch;
+
+      if (state.context.type === 'read-quoted-paused') {
+        state.context = state.context.prev;
+        stream.eat("}");
+      }
+
+      while ((ch = stream.next()) != null) {
+        if (ch == quote && (unescaped || !escaped)) {
+          state.tokenize.pop();
+          break;
+        }
+        if (embed && ch == "#" && !escaped) {
+          if (stream.eat("{")) {
+            if (quote == "}") {
+              state.context = {prev: state.context, type: 'read-quoted-paused'};
+            }
+            state.tokenize.push(tokenBaseUntilBrace());
+            break;
+          } else if (/[@\$]/.test(stream.peek())) {
+            state.tokenize.push(tokenBaseOnce());
+            break;
+          }
+        }
+        escaped = !escaped && ch == "\\";
+      }
+      return style;
+    };
+  }
+  function readHereDoc(phrase) {
+    return function(stream, state) {
+      if (stream.match(phrase)) state.tokenize.pop();
+      else stream.skipToEnd();
+      return "string";
+    };
+  }
+  function readBlockComment(stream, state) {
+    if (stream.sol() && stream.match("=end") && stream.eol())
+      state.tokenize.pop();
+    stream.skipToEnd();
+    return "comment";
+  }
+
+  return {
+    startState: function() {
+      return {tokenize: [tokenBase],
+              indented: 0,
+              context: {type: "top", indented: -config.indentUnit},
+              continuedLine: false,
+              lastTok: null,
+              varList: false};
+    },
+
+    token: function(stream, state) {
+      curPunc = null;
+      if (stream.sol()) state.indented = stream.indentation();
+      var style = state.tokenize[state.tokenize.length-1](stream, state), kwtype;
+      var thisTok = curPunc;
+      if (style == "ident") {
+        var word = stream.current();
+        style = state.lastTok == "." ? "property"
+          : keywords.propertyIsEnumerable(stream.current()) ? "keyword"
+          : /^[A-Z]/.test(word) ? "tag"
+          : (state.lastTok == "def" || state.lastTok == "class" || state.varList) ? "def"
+          : "variable";
+        if (style == "keyword") {
+          thisTok = word;
+          if (indentWords.propertyIsEnumerable(word)) kwtype = "indent";
+          else if (dedentWords.propertyIsEnumerable(word)) kwtype = "dedent";
+          else if ((word == "if" || word == "unless") && stream.column() == stream.indentation())
+            kwtype = "indent";
+          else if (word == "do" && state.context.indented < state.indented)
+            kwtype = "indent";
+        }
+      }
+      if (curPunc || (style && style != "comment")) state.lastTok = thisTok;
+      if (curPunc == "|") state.varList = !state.varList;
+
+      if (kwtype == "indent" || /[\(\[\{]/.test(curPunc))
+        state.context = {prev: state.context, type: curPunc || style, indented: state.indented};
+      else if ((kwtype == "dedent" || /[\)\]\}]/.test(curPunc)) && state.context.prev)
+        state.context = state.context.prev;
+
+      if (stream.eol())
+        state.continuedLine = (curPunc == "\\" || style == "operator");
+      return style;
+    },
+
+    indent: function(state, textAfter) {
+      if (state.tokenize[state.tokenize.length-1] != tokenBase) return 0;
+      var firstChar = textAfter && textAfter.charAt(0);
+      var ct = state.context;
+      var closing = ct.type == matching[firstChar] ||
+        ct.type == "keyword" && /^(?:end|until|else|elsif|when|rescue)\b/.test(textAfter);
+      return ct.indented + (closing ? 0 : config.indentUnit) +
+        (state.continuedLine ? config.indentUnit : 0);
+    },
+
+    electricChars: "}de", // enD and rescuE
+    lineComment: "#"
+  };
+});
+
+CodeMirror.defineMIME("text/x-ruby", "ruby");
+
+});
diff --git a/public/assets/kindeditor/kindeditor.js b/public/assets/kindeditor/kindeditor.js
index e8c28f678..b045a27cc 100644
--- a/public/assets/kindeditor/kindeditor.js
+++ b/public/assets/kindeditor/kindeditor.js
@@ -264,7 +264,7 @@ K.options = {
 	minHeight : 100,
 	minChangeSize : 50,
 	zIndex : 811213,
-	items : ['code', 'emoticons','fontname',
+	items : ['emoticons','fontname',
         'forecolor', 'hilitecolor', 'bold', '|', 'justifyleft', 'justifycenter', 'insertorderedlist','insertunorderedlist', '|',
 		'formatblock', 'fontsize', '|','indent', 'outdent',
 		 '|','imagedirectupload','table',   'media', 'preview',"more"
@@ -4986,8 +4986,7 @@ KEditor.prototype = {
         htmlList.unshift('<div style="display:block" id="define"/>')
         htmlList.push('</div>')
         var htmlListFull = [];
-        var fullItems =  ['code',
-            'emoticons','fontname',
+        var fullItems =  ['emoticons','fontname',
             'forecolor', 'hilitecolor', 'bold','|', 'justifyleft', 'justifycenter',  'insertorderedlist', 'insertunorderedlist', '|',
             'formatblock', 'fontsize', '|', 'indent', 'outdent',
               '|','imagedirectupload','table',   'media', 'preview', "less",
diff --git a/public/assets/kindeditor/plugins/code/previewcode.css b/public/assets/kindeditor/plugins/code/previewcode.css
index ce3084a7c..f67f04149 100644
--- a/public/assets/kindeditor/plugins/code/previewcode.css
+++ b/public/assets/kindeditor/plugins/code/previewcode.css
@@ -38,8 +38,11 @@ pre.prettyprint { padding: 2px;
     border-right: 1px solid #ccc,
 border-top: 1px solid #ccc }
 
-pre li,ul,ol {
-    list-style-type: none;
+pre li,ol li {
+    list-style-type: decimal;
+}
+ul li{
+    list-style-type: disc;
 }
 /* Specify class=linenums on a pre to get line numbering */
 ol.linenums { margin-top: 0; margin-bottom: 0 } /* IE indents via margin-left */
@@ -50,7 +53,7 @@ li.L3,
 li.L5,
 li.L6,
 li.L7,
-li.L8 { list-style-type: none }
+li.L8 { list-style-type: decimal }
 /* Alternate shading for lines */
 li.L1,
 li.L3,
diff --git a/public/javascripts/course.js b/public/javascripts/course.js
index 4f091560d..b471ea89e 100644
--- a/public/javascripts/course.js
+++ b/public/javascripts/course.js
@@ -940,19 +940,37 @@ function SearchByName(url,event)
 {
     var keycode = (event.keyCode ? event.keyCode : event.which);
     if(keycode == '13'){
-        location.href = url + "&name=" + $("#course_student_name").val() + "&group=" + $("#late_penalty").val();
+        $.get(
+            url,
+            {
+                name : $("#course_student_name").val(),
+                group : $("#student_work_in_group").val()
+            },
+            function (data) {
+            }
+        );
     }
 }
 function SearchByName_1(url)
 {
-    if($("#late_penalty").val() == null){
-        location.href = url + "&name=" + $("#course_student_name").val()
-    }
-    else{
-        location.href = url + "&name=" + $("#course_student_name").val() + "&group=" + $("#late_penalty").val();
-    }
+    //alert($("#student_work_in_group").val());
+    $.get(
+        url,
+        {
+            name : $("#course_student_name").val(),
+            group : $("#student_work_in_group").val()
+        },
+        function (data) {
+        }
+    );
 }
 
+$(function(){
+    $("#student_work_in_group").live("change",function(){
+        $("#search_in_student_work").click();
+    });
+});
+
 //新建作业临时弹框
 function new_homework_alert(){
     alert("您好！课程内直接发布作业的功能正在改进中，请直接点击\n顶部导航栏的“作业”向本课程发送作业。谢谢！如有问\n题，可参见帮助中心。");
diff --git a/public/javascripts/homework.js b/public/javascripts/homework.js
index 9984761c1..c6fb2e9c7 100644
--- a/public/javascripts/homework.js
+++ b/public/javascripts/homework.js
@@ -95,9 +95,9 @@ $(function(){
 
 //发布作业
 
-    //$('#program-src').focus(function(){
-    //    $(this).css('height', '100px');
-    //});
+    $('#program-src').focus(function(){
+        $(this).css('height', '100px');
+    });
     
     var datepickerOptions={dateFormat:'yy-mm-dd',firstDay:0,showWeek:true,showOtherMonths:true,selectOtherMonths:true};
 
@@ -115,7 +115,7 @@ $(function(){
             minWidth: 753
     });
 
-    $('a.ProBtn').live('click', function(){
+    $('a.ProBtn').on('click', function(){
         $("#BluePopupBox").dialog("open");
         $(".ui-dialog-titlebar").hide();
         $("a.CloseBtn").on('click', function(){
@@ -124,6 +124,7 @@ $(function(){
         $('#textarea_input_test').focus();
     });
 
+
     var saveProgramAnswers = function() {
         var test_numbers = 0;
         var valid = true;  
@@ -170,7 +171,7 @@ $(function(){
         return valid;
     }
 
-    $("#BluePopupBox a.BlueCirBtn").live('click', function(){
+    $("#BluePopupBox a.BlueCirBtn").on('click', function(){
         if(saveProgramAnswers()){
             if($( "#BluePopupBox" ).dialog( "isOpen" )){
                 $("#BluePopupBox").dialog( "close" );    
@@ -181,16 +182,40 @@ $(function(){
     $("#BluePopupBox").on('click', 'a.icon_add', function(){
         var html = bt('t:test-answer-list', null);
         $(this).parent('.mt10').after(html);
-        var inputs = document.getElementsByName("program[input][]");
-        var outputs = document.getElementsByName("program[output][]");
-        if (inputs.length == outputs.length) {
-            for (var i=0; i<inputs.length; i++) {
-                autoTextarea2(inputs[i], outputs[i]);
-                autoTextarea2(outputs[i], inputs[i]);
-            }
-        }
+
     });
     $("#BluePopupBox").on('click', 'a.icon_remove', function(){
         $(this).parent('.mt10').remove();
     });
-});
+
+
+    //代码编辑器
+    if (typeof CodeMirror != "undefined") {
+        var program_name = "text/x-csrc";
+        var language = $('#data-language').attr('data-language');
+        if (language == 1) {
+            program_name = 'text/x-csrc';    
+        } else if(language==2){
+            program_name = 'text/x-c++src';
+        }else if(language==3){
+            program_name = 'text/x-cython';
+        }
+
+        var editor = CodeMirror.fromTextArea(document.getElementById("program-src"), {
+            mode: {name: program_name,
+                   version: 2,
+                   singleLineStringErrors: false},
+            lineNumbers: true,
+            indentUnit: 2,
+            matchBrackets: true
+        });
+
+        editor.on('change',function(cMirror){
+            // get value right from instance
+            $('#program-src').val(cMirror.getValue());
+        });
+    }
+    
+
+
+});
\ No newline at end of file
diff --git a/public/javascripts/init_activity_KindEditor.js b/public/javascripts/init_activity_KindEditor.js
index 1e51067ef..decbbb341 100644
--- a/public/javascripts/init_activity_KindEditor.js
+++ b/public/javascripts/init_activity_KindEditor.js
@@ -6,42 +6,49 @@ function init_editor(params){
 
     var editor = params.kindutil.create(params.textarea, {
         resizeType : 1,minWidth:"1px",width:"95%",
-        height:"30px",// == undefined ? "30px":paramsHeight+"px",
-        minHeight:"30px",// == undefined ? "30px":paramsHeight+"px",
+        height:"33px",// == undefined ? "30px":paramsHeight+"px",
+        minHeight:"33px",// == undefined ? "30px":paramsHeight+"px",
         items:['emoticons'],
         afterChange:function(){//按键事件
 
             var edit = this.edit;
             var body = edit.doc.body;
             edit.iframe.height(paramsHeight);
-            this.resize(null, Math.max((params.kindutil.IE ? body.scrollHeight : body.offsetHeight) + (paramsHeight == undefined ? 30:paramsHeight), paramsHeight));
+            this.resize(null, Math.max((params.kindutil.IE ? body.scrollHeight : body.offsetHeight) + paramsHeight , paramsHeight));
         },
         afterBlur:function(){
             nh_check_field({content:this,contentmsg:params.contentmsg,textarea:params.textarea});
             if(this.edit.html()=="") {
-                this.edit.html('<span id="hint" style="color: #808080">我要回复</span>');
+                this.edit.html("<span id='hint' style='color: #999999; font-size: 12px'>我要回复</span>");
             }
             //params.toolbar_container.hide();
             $('#reply_image_' + id).addClass('imageFuzzy');
-            //this.resize("95%", null);
+            if(/^\s*<\w*\s*\w*\=\"\w*\"\s*\w*\=\"\w*\:\s*\#\d*\;\s*\w*\-\w*\:\s*\w*\;\"\>[\u4e00-\u9fa5]*<\/\w*\>\s*$/.test(this.edit.html())){
+                params.submit_btn.hide();
+                this.resize("95%", null);
+            }else if(edit.html().val().trim() != ""){
+                params.submit_btn.show();
+            }
+
             //params.submit_btn.css("display","none");
         },
         afterFocus: function(){
             var edit = this.edit;
             var body = edit.doc.body;
-            if(/^\s*<\w*\s*\w*\=\"\w*\"\s*\w*\=\"\w*\:\#\d*\;\"\>[\u4e00-\u9fa5]*<\/\w*\>\s*$/.test(edit.html())){
+            if(/^\s*<\w*\s*\w*\=\"\w*\"\s*\w*\=\"\w*\:\s*\#\d*\;\s*\w*\-\w*\:\s*\w*\;\"\>[\u4e00-\u9fa5]*<\/\w*\>\s*$/.test(edit.html())){
                 edit.html('');
             }
+            params.submit_btn.show();
             params.contentmsg.hide();
             // params.toolbar_container.show();
             $('#reply_image_' + id).removeClass('imageFuzzy');
             //edit.iframe.width(paramsWidth);
             this.resize(paramsWidth, null);
-            params.submit_btn.show();
+            //params.submit_btn.show();
         },
 
         afterCreate:function(){
-            params.submit_btn.css("display","none");
+            //params.submit_btn.hide();
             var toolbar = $("div[class='ke-toolbar']",params.div_form);
             toolbar.css('width',24);
             $(".ke-outline>.ke-toolbar-icon",toolbar).append('表情');
@@ -52,12 +59,10 @@ function init_editor(params){
             edit.iframe[0].scroll = 'no';
             body.style.overflowY = 'hidden';
             //reset height
-            var edit = this.edit;
-            var body = edit.doc.body;
             paramsHeight = paramsHeight == undefined ? params.kindutil.removeUnit(this.height) : paramsHeight;
             edit.iframe.height(paramsHeight);
-            edit.html('<span id="hint" style="color: #808080">我要回复</span>');
-            this.resize(null, Math.max((params.kindutil.IE ? body.scrollHeight : body.offsetHeight)+ (paramsHeight == undefined ? 30:paramsHeight) , paramsHeight));
+            edit.html("<span id='hint' style='color: #999999; font-size: 12px'>我要回复</span>");
+            this.resize(null,Math.max((params.kindutil.IE ? body.scrollHeight : body.offsetHeight)+ paramsHeight , paramsHeight));// Math.max((params.kindutil.IE ? body.scrollHeight : body.offsetHeight)+ paramsHeight , paramsHeight)
             // params.toolbar_container.hide();
 
         }
@@ -74,7 +79,7 @@ function nh_check_field(params){
         if(params.content.html()!=params.textarea.html() || params.issubmit==true){
             params.textarea.html(params.content.html());
             params.content.sync();
-            if(params.content.isEmpty() || /^\&\w*\;\w*\s*\w*\=\"\w*\"\s*\w*\=\"\w*\:\#\d*\;\"\&\w*\;[\u4e00-\u9fa5]*\&\w*\;\/\w*\&\w*\;$/.test(params.textarea.html())){
+            if(params.content.isEmpty() || /^\s*<\w*\s*\w*\=\"\w*\"\s*\w*\=\"\w*\:\s*\#\d*\;\s*\w*\-\w*\:\s*\w*\;\"\>[\u4e00-\u9fa5]*<\/\w*\>\s*$/.test(params.textarea.html())){
                 params.contentmsg.html('内容不能为空');
                 params.contentmsg.css({color:'#ff0000'});
             }else{
@@ -152,5 +157,5 @@ function init_activity_KindEditor_data(id){
         });
     });
 
-    $(".ke-edit").css("height","25px");
+    $(".ke-edit").css("height","33px");
 }
\ No newline at end of file
diff --git a/public/javascripts/new_user.js b/public/javascripts/new_user.js
index e5f5e8b4c..fb71d75db 100644
--- a/public/javascripts/new_user.js
+++ b/public/javascripts/new_user.js
@@ -56,18 +56,20 @@ function show_more_project(url){
 }
 
 //老师提交 新建/修改 作业
-function submit_homework(id)
-{
-    if(!regex_homework_name())
-    {
+function submit_homework(id){
+    if(!regex_homework_name()){
         $("#homework_name").focus();
     }
-    else if(!regex_homework_end_time())
-    {
+    else if(!regex_homework_end_time()){
         $("#homework_end_time").focus();
     }
-    else if(!regex_course_id())
-    {
+    //else if(!regex_evaluation_start()){
+    //    $("#evaluation_start_time").focus()
+    //}
+    //else if(!regex_evaluation_end()){
+    //    $("#evaluation_end_time").focus()
+    //}
+    else if(!regex_course_id()){
         $("#course_id").focus();
     }
     else{
@@ -134,6 +136,42 @@ function search_homework_by_name(url){
     );
 }
 
+//验证匿评开启时间：大于截止时间,或者为空
+function regex_evaluation_start(){
+    var evaluation_start = $.trim($("#evaluation_start_time").val());
+    if(evaluation_start == ""){
+        return true;
+    }
+    var end_time = new Date($.trim($("#homework_end_time").val()));
+    var evaluation_start_time = new Date(evaluation_start);
+    if(evaluation_start_time > end_time){
+        return true;
+    }else{
+        $("#homework_end_time_span").text("开启匿评日期必须大于截止日期");
+        return false;
+    }
+}
+
+//验证匿评结束时间：大于匿评开启时间,或者为空。当匿评开启时间为空时，匿评结束时间必须为空
+function regex_evaluation_end(){
+    var evaluation_start = $.trim($("#evaluation_start_time").val());
+    var evaluation_end = $.trim($("#evaluation_end_time").val());
+    if(evaluation_end == ""){
+        return true;
+    }else if(evaluation_start == ""){
+        $("#homework_end_time_span").text("开启匿评日期为空时，关闭匿评日期必须为空");
+        return false;
+    }
+    var evaluation_start_time = new Date(evaluation_start);
+    var evaluation_end_time = new Date(evaluation_end);
+    if(evaluation_end_time > evaluation_start_time){
+        return true;
+    }else{
+        $("#homework_end_time_span").text("关闭匿评日期必须大于开启匿评日期");
+        return false;
+    }
+}
+
 //提交新建作品
 function new_student_work()
 {
diff --git a/public/stylesheets/courses.css b/public/stylesheets/courses.css
index 7c1e590db..754112b52 100644
--- a/public/stylesheets/courses.css
+++ b/public/stylesheets/courses.css
@@ -31,8 +31,8 @@ a:hover.news_foot{ color:#787b7e; border:1px solid #d4d4d4;}
 
 /*右侧内容新*/
 .ctt2{clear:both; }
-.hworkListBanner {width:720px; height:40px; background:#eaeaea; margin-bottom:10px; margin-left:5px;}
-.hworkListContainer {float:left; clear:both; width:720px; margin-left:5px;}
+.hworkListBanner {width:720px; height:40px; background:#eaeaea; margin-bottom:10px;}
+.hworkListContainer {float:left; clear:both; width:720px;}
 .showHwork{ border:2px solid #269ac9; width:696px; padding:10px; color:#666666; padding-bottom:0px; }
 .showHworkP{ width:630px; float:left;}
 .showHwork ul li {margin-bottom: 5px;}
@@ -41,17 +41,21 @@ a:hover.news_foot{ color:#787b7e; border:1px solid #d4d4d4;}
 .pingBoxTit{ float:left; width:625px; margin-left:10px;}
 .pingText{border:1px solid #CCCCCC; margin:5px; padding:5px; width:610px; height:20px; }
 .pingBackTit{ float:left; width:573px; margin-left:10px; }
-.hworkUl{ height:50px; border-bottom:1px solid #eaeaea; line-height:50px; vertical-align:middle;}
+.hworkUl{ height:30px; border-bottom:1px solid #eaeaea; line-height:30px; vertical-align:middle; padding-bottom:5px;}
+.hworkH30 {height:30px !important; line-height:30px !important;}
 .hworkListRow {height:65px; border-bottom:1px solid #eaeaea; line-height:65px; vertical-align:middle;}
-.hworkListRow:hover {background-color:#f6f6f7; cursor:pointer;}
+.hworkListRow:hover {background-color:#f6f6f7;}
 .hworkUl li{ float:left;}
 .hworkListRow li{ float:left;}
-.hworkList380 {width:375px; text-align:left; height:50px; line-height:50px;padding-left:5px;}
+.hworkList340 {width:335px; text-align:left; height:50px; line-height:50px;padding-left:5px;}
 .hworkList80 {width:80px; text-align:center;}
 .hworkList50 {width:50px; text-align:center;}
+.hworkList130 {width:130px; text-align:center;}
 .codeList{ float:right; font-size:12px; color:#484848; padding:0px 3px;  width:714px; margin-bottom:10px; }
-.hworkName {max-width:380px; overflow:hidden; white-space: nowrap; text-overflow:ellipsis; float:left; height:16px; line-height:16px;}
-.hworkDetail {max-width:100px; overflow:hidden; white-space: nowrap; text-overflow:ellipsis; float:left; height:14px; line-height:14px; font-size:12px; color:#888888;}
+.hworkName {width:115px; float:left; line-height:18px;}
+.hworkName div{max-height: 40px;overflow: hidden;}
+.hworkStName {width:60px; max-width:60px; overflow:hidden; white-space: nowrap; text-overflow:ellipsis; float:left; height:18px; line-height:18px; font-size:12px; color:#888888; text-align:center;}
+.hworkStID {width:80px; max-width:80px; overflow:hidden; white-space: nowrap; text-overflow:ellipsis; float:left; height:18px; line-height:18px; font-size:12px; color:#888888; text-align:center;}
 .hworkDate {max-width:150px; overflow:hidden; white-space: nowrap; text-overflow:ellipsis; float:left; height:14px; line-height:14px; font-size:12px; color:#888888;}
 .hworkMenu {width:100px; background-color:#ffffff; float:left; list-style:none; position:absolute; border:1px solid #eaeaea; border-radius:5px; top:15px; padding:10px 20px; left:-110px; font-size:12px; color:#888888; display:none; line-height:2;}
 a.hworkExport {background:url(../images/homepage_icon2.png) -10px -401px no-repeat; padding-left:23px;}
@@ -60,11 +64,25 @@ a.hworkSetting {background:url(../images/homepage_icon2.png) -10px -450px no-rep
 .infoNi{ width:100px; padding:5px;-moz-border-radius:3px;  -webkit-border-radius:3px;  border-radius:3px; box-shadow:0px 0px 5px #194a81; color:#666; background:#fff; text-align:left; line-height:2; position:absolute; margin-top:-24px;margin-left: 40px;}
 .problemTxt {width:660px; margin-left:10px; color:#777777; position:relative;}
 .rTxtTit{width:560px; overflow:hidden; white-space: nowrap; text-overflow:ellipsis;color:#15bccf; float:left; color:#269ac9; font-size:14px;}
-.width620{width: 620px;}
-.width625{width: 625px;}
-.width455{width: 455px;}
-.m_width620{max-width: 620px;}
+.hworkSearchBox {border:1px solid #e6e6e6; width:185px; float:left; background-color:#ffffff;}
+.hworkSearchInput {border:none; outline:none; background-color:#ffffff; width:145px; height:25px; padding-left:10px; display:block; float:left;}
+.hworkSearchIcon {width:30px; height:25px; background:url(../images/nav_icon.png) -8px -1px no-repeat; float:left;}
+a.hworkSearchIcon:hover {background:url(../images/nav_icon.png) -49px -1px no-repeat;}
+.classSplit {border:1px solid #e7e7e7; height:27px; line-height:27px; display:inline-block; margin-left:10px; padding-left:5px; cursor:pointer; outline:none; width:95px; max-width:95px;}
+.classList {width:45px; border:1px solid #e7e7e7; float:left; position:absolute; background-color:#ffffff; left:-1px;}
+.hworkPortrait {float:left; width:40px;}
+.HomeworkNameTitle{width: 285px;text-align: center;margin-left: 50px;}
+.HomeworkStuTitle{width: 80px;text-align: center;}
+.StudentName{display: table-cell;width: 115px;vertical-align: middle;text-align: center;height: 40px;}
+.width385{width: 385px;}
+.width505{width: 505px;}
+.width165{width: 165px;}
 .width180{width: 180px;}
+.width525{width: 525px;}
+.width285{width: 285px;}
+.mr95{margin-right: 95px;}
+.ml100{margin-left: 100px;}
+.mt16{margin-top: 16px;}
 
 
 /*邮件邀请*/
@@ -262,6 +280,8 @@ a:hover.ping_sub{ background:#14a8b9;}
 .ping_distop p{ color:#5f5f5f;word-break: break-all;word-wrap: break-word;}
 .ping_disfoot a{ float:right; color: #6883b6; margin-left:5px; margin-bottom:5px;}
 /*.ping_distop span a{ float:right; width:20px; height:20px; background:url(images/star.png) -24px 0 no-repeat; margin-right:3px;}*/
+.list_style ol li{list-style-type: decimal;margin-left: 20px;}
+.list_style ul li{list-style-type: disc;margin-left: 20px;}
 
 /* 创建作品 work */
 .Newwork{ width:668px; height:418px;}
@@ -637,7 +657,7 @@ a.Reply_pic{ display:block; width:30px; height:30px; padding:2px; border:1px sol
 a:hover.Reply_pic{border:1px solid #64bdd9;}
 .Msg_txt{ float:left; width:540px; margin-left:10px;}
 .Msg_txt p{ }
-.talkWrapMsg ul li{border-bottom:1px dashed #d9d9d9; padding-bottom:10px; margin-bottom:10px;}
+.talkWrapMsg > ul > li{border-bottom:1px dashed #d9d9d9; padding-bottom:10px; margin-bottom:10px;}
 .talkReply{ width:540px; margin-left:50px; border-top:1px dashed #d9d9d9; padding-top:10px; }
 .Replybox{ float:left; width:495px; margin-left:5px;}
 .talk_nextpage{ border:none; width:410px; margin:0 auto;}
diff --git a/public/stylesheets/css.css b/public/stylesheets/css.css
index ebb290597..6114c1b4d 100644
--- a/public/stylesheets/css.css
+++ b/public/stylesheets/css.css
@@ -120,7 +120,8 @@ a:hover.ping_sub{ background:#14a8b9;}
 .ping_distop span{ float:left;}
 .ping_distop p{ color:#5f5f5f;min-height: 24px;}
 .ping_disfoot a{ float:right; color:#15bccf; margin-left:5px;}
-
+.list_style ol li{list-style-type: decimal;margin-left: 20px;}
+.list_style ul li{list-style-type: disc;margin-left: 20px;}
 .ping_distop span a{ float:right; /*width:20px;*/ height:20px; background:url(images/star.png) -24px 0 no-repeat; margin-right:3px;}
 
 
diff --git a/public/stylesheets/new_user.css b/public/stylesheets/new_user.css
index 144589d5b..5e049e029 100644
--- a/public/stylesheets/new_user.css
+++ b/public/stylesheets/new_user.css
@@ -568,6 +568,7 @@ a.postTypeGrey:hover {color:#269ac9;}
 .homepagePostReply {width:710px; margin:0px auto; background-color:#f1f1f1; margin-top:10px;}
 .homepagePostReplyBanner {width:708px; height:33px; border:1px solid #e4e4e4; line-height:33px; vertical-align:middle; font-size:12px; color:#888888;}
 .borderBottomNone {border-bottom:none !important;}
+.topBorder {border-top: 1px solid #e4e4e4;}
 div.minHeight48{min-height: 48px;}
 .homepagePostReplyBannerCount{width:255px; display:inline-block; margin-left:20px;}
 .homepagePostReplyBannerTime{width:85px; display:inline-block;}
@@ -688,8 +689,6 @@ a.referenceTypeBlock {color:#888888; display:inline-block; padding:0px 20px;}
 .Agreementh4{ color:#2980b9; font-weight:bold; font-size:14px; margin-top:30px;}
 .AgreementTxt{text-indent:2em; margin-bottom:15px;}
 .AgreementImg{ margin:0px auto; width:619px;}
-.AgreementTxt{text-indent: 2em; margin-bottom: 15px;}
-.AgreementImg{margin: 0px auto; width: 820px;}
 
 /*底部*/
 #Footer{background-color:#ffffff;  padding-bottom:15px; color:#666666;} /*margin-bottom:10px;*/
@@ -1150,3 +1149,6 @@ a:hover.tijiao{ background:#0f99a9;}
 a.link_file_a{ background:url(../images/pic_file.png) 0 2px no-repeat; padding-left:20px; }
 a:hover.link_file_a{ background:url(../images/pic_file.png) 0 -25px no-repeat; color:#3ca5c6;}
 .link_file_a{ display:block; max-width:450px;overflow:hidden; white-space: nowrap; text-overflow:ellipsis;}
+
+.list_style ol li{list-style-type: decimal;margin-left: 20px;}
+.list_style ul li{list-style-type: disc;margin-left: 20px;}
\ No newline at end of file
diff --git a/public/stylesheets/project.css b/public/stylesheets/project.css
index bee965a90..963b4aeb3 100644
--- a/public/stylesheets/project.css
+++ b/public/stylesheets/project.css
@@ -328,6 +328,8 @@ a:hover.ping_sub{ background:#14a8b9;}
 .ping_distop p{ color:#5f5f5f;word-break: break-all;word-wrap: break-word;}
 .ping_disfoot a{ float:right; color: #6883b6; margin-left:5px; margin-bottom:5px;}
 /*.ping_distop span a{ float:right; width:20px; height:20px; background:url(images/star.png) -24px 0 no-repeat; margin-right:3px;}*/
+.list_style ol li{list-style-type: decimal;margin-left: 20px;}
+.list_style ul li{list-style-type: disc;margin-left: 20px;}
 
 /*上传资源弹出框样式*/
 .popbox_polls{position:fixed !important;}
@@ -862,7 +864,7 @@ a.Reply_pic{ display:block; width:30px; height:30px; padding:2px; border:1px sol
 a:hover.Reply_pic{border:1px solid #64bdd9;}
 .Msg_txt{ float:left; width:540px; margin-left:10px;}
 .Msg_txt p{ }
-.talkWrapMsg ul li{border-bottom:1px dashed #d9d9d9; padding-bottom:10px; margin-bottom:10px;}
+.talkWrapMsg > ul > li{border-bottom:1px dashed #d9d9d9; padding-bottom:10px; margin-bottom:10px;}
 .talkReply{ width:540px; margin-left:50px; border-top:1px dashed #d9d9d9; padding-top:10px; }
 .Replybox{ float:left; width:495px; margin-left:5px;}
 .talk_nextpage{ border:none; width:410px; margin:0 auto;}
diff --git a/public/stylesheets/public.css b/public/stylesheets/public.css
index 4f44a8b60..d8285709f 100644
--- a/public/stylesheets/public.css
+++ b/public/stylesheets/public.css
@@ -91,8 +91,10 @@ h4{ font-size:14px; color:#3b3b3b;}
 .mr45{margin-right: 45px;}
 .mr50{margin-right: 50px;}
 .mr55{margin-right: 55px;}
+.mr60 {margin-right:60px;}
 .mr70{margin-right: 70px;}
 .mw15{margin:0 15px;}
+.mr90 {margin-right:90px;}
 .mw20{ margin: 0 20px;}
 .mt1{margin-top: 1px;}
 .mt-4 {margin-top:-4px;}
@@ -102,9 +104,10 @@ h4{ font-size:14px; color:#3b3b3b;}
 .mt8{ margin-top:8px;}
 .mt10{ margin-top:10px !important;}
 .mt30{ margin-top: 30px;}
-.mt12 { margin-top:12px;}
+.mt12 { margin-top:12px !important;}
 .mt15 {margin-top:15px;}
 .mt19 {margin-top:19px !important;}
+.ml70{margin-left: 70px;}
 .mb4{ margin-bottom:4px;}
 .mb5{ margin-bottom:5px;}
 .mb8 {margin-bottom:8px;}
@@ -213,6 +216,8 @@ a.linkGrey5 {color:#484848;}
 a.linkGrey5:hover {color:#3498db;}
 a.linkGrey6 {color:#484848 !important;}
 a.linkGrey6:hover {color:#ffffff !important;}
+a.linkGrey7 {color:#888888;}
+a.linkGrey7:hover {color:#269ac9;}
 a.bBlue {background-color:#3498db;}
 a.bBlue:hover {background-color:#297fb8;}
 a.submit_btn {border:1px solid #3498db; padding:3px 10px; border-radius:3px; color:#3498db;}
@@ -293,7 +298,7 @@ a:hover.bgreen_n_btn{background:#08a384;}
 #Container{ width:1000px; margin:0 auto; }
 
 /*头部导航*/
-#Header{ margin:10px 0; background:#15bccf; height:40px; -moz-border-radius:5px;  -webkit-border-radius:5px;  border-radius:5px; }
+#Header{ margin:10px 0; background:#15bccf; height:40px; -moz-border-radius:5px;  -webkit-border-radius:5px;  border-radius:5px; position: relative;}
 .logo{ margin:5px 10px; }
 #TopNav{}
 #TopNav ul li{ margin-top:8px;}
@@ -604,6 +609,7 @@ a.postTypeGrey:hover {color:#269ac9;}
 .homepagePostReply {width:720px; margin:0px auto; background-color:#f1f1f1; margin-top:10px;}
 .homepagePostReplyBanner {width:708px; height:33px; border:1px solid #e4e4e4; line-height:33px; vertical-align:middle; font-size:12px; color:#888888;}
 .borderBottomNone {border-bottom:none !important;}
+.topBorder {border-top: 1px solid #e4e4e4;}
 .homepagePostReplyBannerCount{width:255px; display:inline-block; margin-left:20px;}
 .homepagePostReplyBannerTime{width:85px; display:inline-block;}
 .homepagePostReplyBannerMore{width:330px; display:inline-block; text-align:right;}
@@ -942,5 +948,8 @@ a.resourcesBlack:hover {font-size:12px; color:#000000;}
 
 .AgreementBox{margin: 20px 0; color: #666666; font-size: 14px; line-height: 1.9;}
 .Agreementh4{ color:#2980b9; font-weight:bold; font-size:14px; margin-top:30px; border: none;}
-.AgreementTxt{text-indent: 2em; margin-bottom: 15px;}
-.AgreementImg{margin: 0px auto; width: 820px;}
+.AgreementTxt{text-indent:2em; margin-bottom:15px;}
+.AgreementImg{ margin:0px auto;}
+
+.list_style ol li{list-style-type: decimal;margin-left: 20px;}
+.list_style ul li{list-style-type: disc;margin-left: 20px;}
diff --git a/public/stylesheets/public_new.css b/public/stylesheets/public_new.css
index 7cd0a461c..2d39e75ea 100644
--- a/public/stylesheets/public_new.css
+++ b/public/stylesheets/public_new.css
@@ -794,4 +794,4 @@ div.flash.warning, .conflict {
 .AgreementBox{ margin:20px 0; color:#666666; font-size:14px; line-height:1.9;}
 .Agreementh4{ color:#2980b9; font-weight:bold; font-size:14px; margin-top:30px; border: none;}
 .AgreementTxt{text-indent: 2em; margin-bottom: 15px;}
-.AgreementImg{margin: 0px auto; width: 820px;}
\ No newline at end of file
+.AgreementImg{margin: 0px auto;}
\ No newline at end of file