+def new_context(environment, template_name, blocks, vars=None,
+ shared=None, globals=None, locals=None):
+ """Internal helper to for context creation."""
+ if vars is None:
+ vars = {}
+ if shared:
+ parent = vars
+ else:
+ parent = dict(globals or (), **vars)
+ if locals:
+ # if the parent is shared a copy should be created because
+ # we don't want to modify the dict passed
+ if shared:
+ parent = dict(parent)
+ for key, value in locals.iteritems():
+ if key[:2] == 'l_' and value is not missing:
+ parent[key[2:]] = value
+ return Context(environment, parent, template_name, blocks)
+
+
+class TemplateReference(object):
+ """The `self` in templates."""
+
+ def __init__(self, context):
+ self.__context = context
+
+ def __getitem__(self, name):
+ blocks = self.__context.blocks[name]
+ return BlockReference(name, self.__context, blocks, 0)
+
+ def __repr__(self):
+ return '<%s %r>' % (
+ self.__class__.__name__,
+ self.__context.name
+ )
+
+