Fixed #17660 -- Standardize extends tag token parsing

git-svn-id: http://code.djangoproject.com/svn/django/trunk@17568 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/template/loader_tags.py

@@ -1,5 +1,6 @@
 from django.conf import settings
-from django.template.base import TemplateSyntaxError, Library, Node, TextNode, token_kwargs
+from django.template.base import TemplateSyntaxError, Library, Node, TextNode,\
+    token_kwargs, Variable
 from django.template.loader import get_template
 from django.utils.safestring import mark_safe
 
@@ -74,26 +75,23 @@ class BlockNode(Node):
 class ExtendsNode(Node):
     must_be_first = True
 
-    def __init__(self, nodelist, parent_name, parent_name_expr, template_dirs=None):
+    def __init__(self, nodelist, parent_name, template_dirs=None):
         self.nodelist = nodelist
-        self.parent_name, self.parent_name_expr = parent_name, parent_name_expr
+        self.parent_name = parent_name
         self.template_dirs = template_dirs
         self.blocks = dict([(n.name, n) for n in nodelist.get_nodes_by_type(BlockNode)])
 
     def __repr__(self):
-        if self.parent_name_expr:
-            return "<ExtendsNode: extends %s>" % self.parent_name_expr.token
-        return '<ExtendsNode: extends "%s">' % self.parent_name
+        return '<ExtendsNode: extends %s>' % self.parent_name.token
 
     def get_parent(self, context):
-        if self.parent_name_expr:
-            parent = self.parent_name_expr.resolve(context)
-        else:
-            parent = self.parent_name
+        parent = self.parent_name.resolve(context)
         if not parent:
             error_msg = "Invalid template name in 'extends' tag: %r." % parent
-            if self.parent_name_expr:
-                error_msg += " Got this from the '%s' variable." % self.parent_name_expr.token
+            if self.parent_name.filters or\
+                    isinstance(self.parent_name.var, Variable):
+                error_msg += " Got this from the '%s' variable." %\
+                    self.parent_name.token
             raise TemplateSyntaxError(error_msg)
         if hasattr(parent, 'render'):
             return parent # parent is a Template object
@@ -212,15 +210,11 @@ def do_extends(parser, token):
     bits = token.split_contents()
     if len(bits) != 2:
         raise TemplateSyntaxError("'%s' takes one argument" % bits[0])
-    parent_name, parent_name_expr = None, None
-    if bits[1][0] in ('"', "'") and bits[1][-1] == bits[1][0]:
-        parent_name = bits[1][1:-1]
-    else:
-        parent_name_expr = parser.compile_filter(bits[1])
+    parent_name = parser.compile_filter(bits[1])
     nodelist = parser.parse()
     if nodelist.get_nodes_by_type(ExtendsNode):
         raise TemplateSyntaxError("'%s' cannot appear more than once in the same template" % bits[0])
-    return ExtendsNode(nodelist, parent_name, parent_name_expr)
+    return ExtendsNode(nodelist, parent_name)
 
 @register.tag('include')
 def do_include(parser, token):

docs/releases/1.4.txt

@@ -1031,6 +1031,17 @@ If you depended on the output of this command -- if you parsed it, for example
 management commands in a script, use
 :djadmin:`manage.py help --commands <help>` instead.
 
+``extends`` template tag
+~~~~~~~~~~~~~~~~~~~~~~~~
+
+Previously, the :ttag:`extends` tag used a buggy method of parsing arguments,
+which could lead to it erroneously considering an argument as a string literal
+when it wasn't.  It now utilises ``parser.compile_filter`` like other tags.
+
+The internals of the tag aren't part of the official stable API, but in the
+interests of full disclosure, the ``ExtendsNode.__init__`` definition has
+changed which may break any custom tags that use this node class.
+
 Features deprecated in 1.4
 ==========================
 

tests/regressiontests/templates/tests.py

@@ -1204,6 +1204,9 @@ class Templates(unittest.TestCase):
             'inheritance40': ("{% extends 'inheritance33' %}{% block opt %}new{{ block.super }}{% endblock %}", {'optional': 1}, '1new23'),
             'inheritance41': ("{% extends 'inheritance36' %}{% block opt %}new{{ block.super }}{% endblock %}", {'numbers': '123'}, '_new1_new2_new3_'),
 
+            # Expression starting and ending with a quote
+            'inheritance42': ("{% extends 'inheritance02'|cut:' ' %}", {}, '1234'),
+
             ### LOADING TAG LIBRARIES #################################################
             'load01': ("{% load testtags subpackage.echo %}{% echo test %} {% echo2 \"test\" %}", {}, "test test"),
             'load02': ("{% load subpackage.echo %}{% echo2 \"test\" %}", {}, "test"),