from django.db import models
from django.contrib.contenttypes.models import ContentType
from django.core.paginator import Paginator, EmptyPage
+from django.template import Context
+from django.template.loader_tags import ExtendsNode, ConstantIncludeNode
class ContentTypeLimiter(object):
objects = page.object_list
return paginator, page, objects
+
+
+LOADED_TEMPLATE_ATTR = '_philo_loaded_template'
+BLANK_CONTEXT = Context()
+
+
+def get_extended(self):
+ return self.get_parent(BLANK_CONTEXT)
+
+
+def get_included(self):
+ return self.template
+
+
+# We ignore the IncludeNode because it will never work in a blank context.
+setattr(ExtendsNode, LOADED_TEMPLATE_ATTR, property(get_extended))
+setattr(ConstantIncludeNode, LOADED_TEMPLATE_ATTR, property(get_included))
+
+
+def nodelist_crawl(nodelist, callback):
+ """This function crawls through a template's nodelist and the nodelists of any included or extended
+ templates, as determined by the presence and value of <LOADED_TEMPLATE_ATTR> on a node. Each node
+ will also be passed to a callback function for additional processing."""
+ results = []
+ for node in nodelist:
+ try:
+ if hasattr(node, 'child_nodelists'):
+ for nodelist_name in node.child_nodelists:
+ if hasattr(node, nodelist_name):
+ results.extend(nodelist_crawl(getattr(node, nodelist_name), callback))
+
+ # LOADED_TEMPLATE_ATTR contains the name of an attribute philo uses to declare a
+ # node as rendering an additional template. Philo monkeypatches the attribute onto
+ # the relevant default nodes and declares it on any native nodes.
+ if hasattr(node, LOADED_TEMPLATE_ATTR):
+ loaded_template = getattr(node, LOADED_TEMPLATE_ATTR)
+ if loaded_template:
+ results.extend(nodelist_crawl(loaded_template.nodelist, callback))
+
+ callback(node, results)
+ except:
+ raise # fail for this node
+ return results
\ No newline at end of file