Fixed #2181 -- allow '{' and '}' to be escaped via {% templatetag ... %}.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@3138 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/template/__init__.py

@@ -75,6 +75,8 @@ BLOCK_TAG_START = '{%'
 BLOCK_TAG_END = '%}'
 VARIABLE_TAG_START = '{{'
 VARIABLE_TAG_END = '}}'
+SINGLE_BRACE_START = '{'
+SINGLE_BRACE_END = '}'
 
 ALLOWED_VARIABLE_CHARS = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_.'
 

django/template/defaulttags.py

@@ -1,7 +1,7 @@
 "Default tags used by the template system, available to all templates."
 
 from django.template import Node, NodeList, Template, Context, resolve_variable
-from django.template import TemplateSyntaxError, VariableDoesNotExist, BLOCK_TAG_START, BLOCK_TAG_END, VARIABLE_TAG_START, VARIABLE_TAG_END
+from django.template import TemplateSyntaxError, VariableDoesNotExist, BLOCK_TAG_START, BLOCK_TAG_END, VARIABLE_TAG_START, VARIABLE_TAG_END, SINGLE_BRACE_START, SINGLE_BRACE_END
 from django.template import get_library, Library, InvalidTemplateLibrary
 from django.conf import settings
 import sys
@@ -275,7 +275,10 @@ class TemplateTagNode(Node):
     mapping = {'openblock': BLOCK_TAG_START,
                'closeblock': BLOCK_TAG_END,
                'openvariable': VARIABLE_TAG_START,
-               'closevariable': VARIABLE_TAG_END}
+               'closevariable': VARIABLE_TAG_END,
+               'openbrace': SINGLE_BRACE_START,
+               'closebrace': SINGLE_BRACE_END,
+               }
 
     def __init__(self, tagtype):
         self.tagtype = tagtype
@@ -809,6 +812,8 @@ def templatetag(parser, token):
         ``closeblock``      ``%}``
         ``openvariable``    ``{{``
         ``closevariable``   ``}}``
+        ``openbrace``       ``{``
+        ``closebrace``      ``}``
         ==================  =======
     """
     bits = token.contents.split()

docs/templates.txt

@@ -766,6 +766,8 @@ The argument tells which template bit to output:
     ``closeblock``      ``%}``
     ``openvariable``    ``{{``
     ``closevariable``   ``}}``
+    ``openbrace``       ``{``
+    ``closebrace``      ``}``
     ==================  =======
 
 widthratio

tests/othertests/templates.py

@@ -499,6 +499,10 @@ TEMPLATE_TESTS = {
     'templatetag04': ('{% templatetag closevariable %}', {}, '}}'),
     'templatetag05': ('{% templatetag %}', {}, template.TemplateSyntaxError),
     'templatetag06': ('{% templatetag foo %}', {}, template.TemplateSyntaxError),
+    'templatetag07': ('{% templatetag openbrace %}', {}, '{'),
+    'templatetag08': ('{% templatetag closebrace %}', {}, '}'),
+    'templatetag09': ('{% templatetag openbrace %}{% templatetag openbrace %}', {}, '{{'),
+    'templatetag10': ('{% templatetag closebrace %}{% templatetag closebrace %}', {}, '}}'),
 
     ### WIDTHRATIO TAG ########################################################
     'widthratio01': ('{% widthratio a b 0 %}', {'a':50,'b':100}, '0'),