Fixed #6510 -- Refactored the way child nodes are found in template n…

…odes to avoid potential inconsistencies. Thanks to SmileyChris for the patch.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@12654 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/template/__init__.py

@@ -770,6 +770,7 @@ class Node(object):
     # Set this to True for nodes that must be first in the template (although
     # they can be preceded by text nodes.
     must_be_first = False
+    child_nodelists = ('nodelist',)
 
     def render(self, context):
         "Return the node rendered as a string"
@@ -783,8 +784,10 @@ def get_nodes_by_type(self, nodetype):
         nodes = []
         if isinstance(self, nodetype):
             nodes.append(self)
-        if hasattr(self, 'nodelist'):
-            nodes.extend(self.nodelist.get_nodes_by_type(nodetype))
+        for attr in self.child_nodelists:
+            nodelist = getattr(self, attr, None)
+            if nodelist:
+                nodes.extend(nodelist.get_nodes_by_type(nodetype))
         return nodes
 
 class NodeList(list):

django/template/defaulttags.py

@@ -97,6 +97,8 @@ def render(self, context):
         return u''
 
 class ForNode(Node):
+    child_nodelists = ('nodelist_loop', 'nodelist_empty')
+
     def __init__(self, loopvars, sequence, is_reversed, nodelist_loop, nodelist_empty=None):
         self.loopvars, self.sequence = loopvars, sequence
         self.is_reversed = is_reversed
@@ -118,14 +120,6 @@ def __iter__(self):
         for node in self.nodelist_empty:
             yield node
 
-    def get_nodes_by_type(self, nodetype):
-        nodes = []
-        if isinstance(self, nodetype):
-            nodes.append(self)
-        nodes.extend(self.nodelist_loop.get_nodes_by_type(nodetype))
-        nodes.extend(self.nodelist_empty.get_nodes_by_type(nodetype))
-        return nodes
-
     def render(self, context):
         if 'forloop' in context:
             parentloop = context['forloop']
@@ -181,6 +175,8 @@ def render(self, context):
         return nodelist.render(context)
 
 class IfChangedNode(Node):
+    child_nodelists = ('nodelist_true', 'nodelist_false')
+
     def __init__(self, nodelist_true, nodelist_false, *varlist):
         self.nodelist_true, self.nodelist_false = nodelist_true, nodelist_false
         self._last_seen = None
@@ -211,6 +207,8 @@ def render(self, context):
         return ''
 
 class IfEqualNode(Node):
+    child_nodelists = ('nodelist_true', 'nodelist_false')
+
     def __init__(self, var1, var2, nodelist_true, nodelist_false, negate):
         self.var1, self.var2 = var1, var2
         self.nodelist_true, self.nodelist_false = nodelist_true, nodelist_false
@@ -227,6 +225,8 @@ def render(self, context):
         return self.nodelist_false.render(context)
 
 class IfNode(Node):
+    child_nodelists = ('nodelist_true', 'nodelist_false')
+
     def __init__(self, var, nodelist_true, nodelist_false=None):
         self.nodelist_true, self.nodelist_false = nodelist_true, nodelist_false
         self.var = var
@@ -240,14 +240,6 @@ def __iter__(self):
         for node in self.nodelist_false:
             yield node
 
-    def get_nodes_by_type(self, nodetype):
-        nodes = []
-        if isinstance(self, nodetype):
-            nodes.append(self)
-        nodes.extend(self.nodelist_true.get_nodes_by_type(nodetype))
-        nodes.extend(self.nodelist_false.get_nodes_by_type(nodetype))
-        return nodes
-
     def render(self, context):
         if self.var.eval(context):
             return self.nodelist_true.render(context)

tests/regressiontests/templates/nodelist.py

@@ -0,0 +1,30 @@
+from unittest import TestCase
+from django.template.loader import get_template_from_string
+from django.template import VariableNode
+
+
+class NodelistTest(TestCase):
+
+    def test_for(self):
+        source = '{% for i in 1 %}{{ a }}{% endfor %}'
+        template = get_template_from_string(source)
+        vars = template.nodelist.get_nodes_by_type(VariableNode)
+        self.assertEqual(len(vars), 1)
+
+    def test_if(self):
+        source = '{% if x %}{{ a }}{% endif %}'
+        template = get_template_from_string(source)
+        vars = template.nodelist.get_nodes_by_type(VariableNode)
+        self.assertEqual(len(vars), 1)
+
+    def test_ifequal(self):
+        source = '{% ifequal x y %}{{ a }}{% endifequal %}'
+        template = get_template_from_string(source)
+        vars = template.nodelist.get_nodes_by_type(VariableNode)
+        self.assertEqual(len(vars), 1)
+
+    def test_ifchanged(self):
+        source = '{% ifchanged x %}{{ a }}{% endifchanged %}'
+        template = get_template_from_string(source)
+        vars = template.nodelist.get_nodes_by_type(VariableNode)
+        self.assertEqual(len(vars), 1)

tests/regressiontests/templates/tests.py

@@ -24,6 +24,7 @@
 from custom import custom_filters
 from parser import token_parsing, filter_parsing, variable_parsing
 from unicode import unicode_tests
+from nodelist import NodelistTest
 from smartif import *
 
 try:
@@ -886,6 +887,32 @@ def get_template_tests(self):
             # Inheritance from a template with a space in its name should work.
             'inheritance29': ("{% extends 'inheritance 28' %}", {}, '!'),
 
+            # Base template, putting block in a conditional {% if %} tag
+            'inheritance30': ("1{% if optional %}{% block opt %}2{% endblock %}{% endif %}3", {'optional': True}, '123'),
+
+            # Inherit from a template with block wrapped in an {% if %} tag (in parent), still gets overridden
+            'inheritance31': ("{% extends 'inheritance30' %}{% block opt %}two{% endblock %}", {'optional': True}, '1two3'),
+            'inheritance32': ("{% extends 'inheritance30' %}{% block opt %}two{% endblock %}", {}, '13'),
+
+            # Base template, putting block in a conditional {% ifequal %} tag
+            'inheritance33': ("1{% ifequal optional 1 %}{% block opt %}2{% endblock %}{% endifequal %}3", {'optional': 1}, '123'),
+
+            # Inherit from a template with block wrapped in an {% ifequal %} tag (in parent), still gets overridden
+            'inheritance34': ("{% extends 'inheritance33' %}{% block opt %}two{% endblock %}", {'optional': 1}, '1two3'),
+            'inheritance35': ("{% extends 'inheritance33' %}{% block opt %}two{% endblock %}", {'optional': 2}, '13'),
+
+            # Base template, putting block in a {% for %} tag
+            'inheritance36': ("{% for n in numbers %}_{% block opt %}{{ n }}{% endblock %}{% endfor %}_", {'numbers': '123'}, '_1_2_3_'),
+
+            # Inherit from a template with block wrapped in an {% for %} tag (in parent), still gets overridden
+            'inheritance37': ("{% extends 'inheritance36' %}{% block opt %}X{% endblock %}", {'numbers': '123'}, '_X_X_X_'),
+            'inheritance38': ("{% extends 'inheritance36' %}{% block opt %}X{% endblock %}", {}, '_'),
+
+            # The super block will still be found.
+            'inheritance39': ("{% extends 'inheritance30' %}{% block opt %}new{{ block.super }}{% endblock %}", {'optional': True}, '1new23'),
+            '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_'),
+
             ### I18N ##################################################################
 
             # {% spaceless %} tag