GMaps related JS changed to use new google namespace.
Google is going to change permanently in the future the way to
load its services, so better stay safe.
Also this commit shows uses of the new melange.js module.
Fixes Issue 634.
from django.template import TemplateSyntaxError, TemplateDoesNotExist, Variable
from django.template import Library, Node, TextNode
from django.template.loader import get_template, get_template_from_string, find_template_source
from django.conf import settings
from django.utils.safestring import mark_safe
register = Library()
class ExtendsError(Exception):
pass
class BlockNode(Node):
def __init__(self, name, nodelist, parent=None):
self.name, self.nodelist, self.parent = name, nodelist, parent
def __repr__(self):
return "<Block Node: %s. Contents: %r>" % (self.name, self.nodelist)
def render(self, context):
context.push()
# Save context in case of block.super().
self.context = context
context['block'] = self
result = self.nodelist.render(context)
context.pop()
return result
def super(self):
if self.parent:
return mark_safe(self.parent.render(self.context))
return ''
def add_parent(self, nodelist):
if self.parent:
self.parent.add_parent(nodelist)
else:
self.parent = BlockNode(self.name, nodelist)
class ExtendsNode(Node):
must_be_first = True
def __init__(self, nodelist, parent_name, parent_name_expr, template_dirs=None):
self.nodelist = nodelist
self.parent_name, self.parent_name_expr = parent_name, parent_name_expr
self.template_dirs = template_dirs
def __repr__(self):
if self.parent_name_expr:
return "<ExtendsNode: extends %s>" % self.parent_name_expr.token
return '<ExtendsNode: extends "%s">' % self.parent_name
def get_parent(self, context):
if self.parent_name_expr:
self.parent_name = self.parent_name_expr.resolve(context)
parent = self.parent_name
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
raise TemplateSyntaxError, error_msg
if hasattr(parent, 'render'):
return parent # parent is a Template object
try:
source, origin = find_template_source(parent, self.template_dirs)
except TemplateDoesNotExist:
raise TemplateSyntaxError, "Template %r cannot be extended, because it doesn't exist" % parent
else:
return get_template_from_string(source, origin, parent)
def render(self, context):
compiled_parent = self.get_parent(context)
parent_blocks = dict([(n.name, n) for n in compiled_parent.nodelist.get_nodes_by_type(BlockNode)])
for block_node in self.nodelist.get_nodes_by_type(BlockNode):
# Check for a BlockNode with this node's name, and replace it if found.
try:
parent_block = parent_blocks[block_node.name]
except KeyError:
# This BlockNode wasn't found in the parent template, but the
# parent block might be defined in the parent's *parent*, so we
# add this BlockNode to the parent's ExtendsNode nodelist, so
# it'll be checked when the parent node's render() is called.
# Find out if the parent template has a parent itself
for node in compiled_parent.nodelist:
if not isinstance(node, TextNode):
# If the first non-text node is an extends, handle it.
if isinstance(node, ExtendsNode):
node.nodelist.append(block_node)
# Extends must be the first non-text node, so once you find
# the first non-text node you can stop looking.
break
else:
# Keep any existing parents and add a new one. Used by BlockNode.
parent_block.parent = block_node.parent
parent_block.add_parent(parent_block.nodelist)
parent_block.nodelist = block_node.nodelist
return compiled_parent.render(context)
class ConstantIncludeNode(Node):
def __init__(self, template_path):
try:
t = get_template(template_path)
self.template = t
except:
if settings.TEMPLATE_DEBUG:
raise
self.template = None
def render(self, context):
if self.template:
return self.template.render(context)
else:
return ''
class IncludeNode(Node):
def __init__(self, template_name):
self.template_name = Variable(template_name)
def render(self, context):
try:
template_name = self.template_name.resolve(context)
t = get_template(template_name)
return t.render(context)
except TemplateSyntaxError, e:
if settings.TEMPLATE_DEBUG:
raise
return ''
except:
return '' # Fail silently for invalid included templates.
def do_block(parser, token):
"""
Define a block that can be overridden by child templates.
"""
bits = token.contents.split()
if len(bits) != 2:
raise TemplateSyntaxError, "'%s' tag takes only one argument" % bits[0]
block_name = bits[1]
# Keep track of the names of BlockNodes found in this template, so we can
# check for duplication.
try:
if block_name in parser.__loaded_blocks:
raise TemplateSyntaxError, "'%s' tag with name '%s' appears more than once" % (bits[0], block_name)
parser.__loaded_blocks.append(block_name)
except AttributeError: # parser.__loaded_blocks isn't a list yet
parser.__loaded_blocks = [block_name]
nodelist = parser.parse(('endblock', 'endblock %s' % block_name))
parser.delete_first_token()
return BlockNode(block_name, nodelist)
def do_extends(parser, token):
"""
Signal that this template extends a parent template.
This tag may be used in two ways: ``{% extends "base" %}`` (with quotes)
uses the literal value "base" as the name of the parent template to extend,
or ``{% extends variable %}`` uses the value of ``variable`` as either the
name of the parent template to extend (if it evaluates to a string) or as
the parent tempate itelf (if it evaluates to a Template object).
"""
bits = token.contents.split()
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])
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)
def do_include(parser, token):
"""
Loads a template and renders it with the current context.
Example::
{% include "foo/some_include" %}
"""
bits = token.contents.split()
if len(bits) != 2:
raise TemplateSyntaxError, "%r tag takes one argument: the name of the template to be included" % bits[0]
path = bits[1]
if path[0] in ('"', "'") and path[-1] == path[0]:
return ConstantIncludeNode(path[1:-1])
return IncludeNode(bits[1])
register.tag('block', do_block)
register.tag('extends', do_extends)
register.tag('include', do_include)