Fixed #256 and #334 -- Added {% ifequal %} template tag. Also, {% ifequal %} and {% ifnotequal %} now both accept an optional {% else %} clause. Unit tests included.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@574 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/core/defaulttags.py

@@ -126,18 +126,21 @@ class IfChangedNode(template.Node):
         else:
             return ''
 
-class IfNotEqualNode(template.Node):
+class IfEqualNode(template.Node):
-    def __init__(self, var1, var2, nodelist):
+    def __init__(self, var1, var2, nodelist_true, nodelist_false, negate):
-        self.var1, self.var2, self.nodelist = var1, var2, nodelist
+        self.var1, self.var2 = var1, var2
+        self.nodelist_true, self.nodelist_false = nodelist_true, nodelist_false
+        self.negate = negate
 
     def __repr__(self):
-        return "<IfNotEqualNode>"
+        return "<IfEqualNode>"
 
     def render(self, context):
-        if template.resolve_variable(self.var1, context) != template.resolve_variable(self.var2, context):
+        val1 = template.resolve_variable(self.var1, context)
-            return self.nodelist.render(context)
+        val2 = template.resolve_variable(self.var2, context)
-        else:
+        if (self.negate and val1 != val2) or (not self.negate and val1 == val2):
-            return ''
+            return self.nodelist_true.render(context)
+        return self.nodelist_false.render(context)
 
 class IfNode(template.Node):
     def __init__(self, boolvars, nodelist_true, nodelist_false):
@@ -449,22 +452,34 @@ def do_for(parser, token):
     parser.delete_first_token()
     return ForNode(loopvar, sequence, reversed, nodelist_loop)
 
-def do_ifnotequal(parser, token):
+def do_ifequal(parser, token, negate):
     """
-    Output the contents of the block if the two arguments do not equal each other.
+    Output the contents of the block if the two arguments equal/don't equal each other.
 
-    Example::
+    Examples::
+
+        {% ifequal user.id comment.user_id %}
+            ...
+        {% endifequal %}
 
         {% ifnotequal user.id comment.user_id %}
             ...
+        {% else %}
+            ...
         {% endifnotequal %}
     """
     bits = token.contents.split()
     if len(bits) != 3:
-        raise template.TemplateSyntaxError, "'ifnotequal' takes two arguments"
+        raise template.TemplateSyntaxError, "%r takes two arguments" % bits[0]
-    nodelist = parser.parse(('endifnotequal',))
+    end_tag = 'end' + bits[0]
-    parser.delete_first_token()
+    nodelist_true = parser.parse(('else', end_tag))
-    return IfNotEqualNode(bits[1], bits[2], nodelist)
+    token = parser.next_token()
+    if token.contents == 'else':
+        nodelist_false = parser.parse((end_tag,))
+        parser.delete_first_token()
+    else:
+        nodelist_false = template.NodeList()
+    return IfEqualNode(bits[1], bits[2], nodelist_true, nodelist_false, negate)
 
 def do_if(parser, token):
     """
@@ -736,7 +751,8 @@ template.register_tag('debug', do_debug)
 template.register_tag('filter', do_filter)
 template.register_tag('firstof', do_firstof)
 template.register_tag('for', do_for)
-template.register_tag('ifnotequal', do_ifnotequal)
+template.register_tag('ifequal', lambda parser, token: do_ifequal(parser, token, False))
+template.register_tag('ifnotequal', lambda parser, token: do_ifequal(parser, token, True))
 template.register_tag('if', do_if)
 template.register_tag('ifchanged', do_ifchanged)
 template.register_tag('regroup', do_regroup)

tests/othertests/templates.py

@@ -92,7 +92,32 @@ TEMPLATE_TESTS = {
     # Raise TemplateSyntaxError for empty block tags
     'basic-syntax28': ("{% %}", {}, template.TemplateSyntaxError),
 
-    ### INHERITANCE TESTS #####################################################
+    ### IF TAG ################################################################
+    'if-tag01': ("{% if foo %}yes{% else %}no{% endif %}", {"foo": True}, "yes"),
+    'if-tag02': ("{% if foo %}yes{% else %}no{% endif %}", {"foo": False}, "no"),
+    'if-tag03': ("{% if foo %}yes{% else %}no{% endif %}", {}, "no"),
+
+    ### COMMENT TAG ###########################################################
+    'comment-tag01': ("{% comment %}this is hidden{% endcomment %}hello", {}, "hello"),
+    'comment-tag02': ("{% comment %}this is hidden{% endcomment %}hello{% comment %}foo{% endcomment %}", {}, "hello"),
+
+    ### FOR TAG ###############################################################
+    'for-tag01': ("{% for val in values %}{{ val }}{% endfor %}", {"values": [1, 2, 3]}, "123"),
+    'for-tag02': ("{% for val in values reversed %}{{ val }}{% endfor %}", {"values": [1, 2, 3]}, "321"),
+
+    ### IFEQUAL TAG ###########################################################
+    'ifequal01': ("{% ifequal a b %}yes{% endifequal %}", {"a": 1, "b": 2}, ""),
+    'ifequal02': ("{% ifequal a b %}yes{% endifequal %}", {"a": 1, "b": 1}, "yes"),
+    'ifequal03': ("{% ifequal a b %}yes{% else %}no{% endifequal %}", {"a": 1, "b": 2}, "no"),
+    'ifequal04': ("{% ifequal a b %}yes{% else %}no{% endifequal %}", {"a": 1, "b": 1}, "yes"),
+
+    ### IFNOTEQUAL TAG ########################################################
+    'ifnotequal01': ("{% ifnotequal a b %}yes{% endifnotequal %}", {"a": 1, "b": 2}, "yes"),
+    'ifnotequal02': ("{% ifnotequal a b %}yes{% endifnotequal %}", {"a": 1, "b": 1}, ""),
+    'ifnotequal03': ("{% ifnotequal a b %}yes{% else %}no{% endifnotequal %}", {"a": 1, "b": 2}, "yes"),
+    'ifnotequal04': ("{% ifnotequal a b %}yes{% else %}no{% endifnotequal %}", {"a": 1, "b": 1}, "no"),
+
+    ### INHERITANCE ###########################################################
 
     # Standard template with no inheritance
     'inheritance01': ("1{% block first %}_{% endblock %}3{% block second %}_{% endblock %}", {}, '1_3_'),
@@ -151,7 +176,7 @@ TEMPLATE_TESTS = {
     # {% load %} tag (within a child template)
     'inheritance19': ("{% extends 'inheritance01' %}{% block first %}{% load testtags %}{% echo 400 %}5678{% endblock %}", {}, '140056783_'),
 
-    ### EXCEPTION TESTS #######################################################
+    ### EXCEPTIONS ############################################################
 
     # Raise exception for invalid template name
     'exception01': ("{% extends 'nonexistent' %}", {}, template.TemplateSyntaxError),