# vim: set fileencoding=utf-8 :
"""
django if templatetag patch
"""
from distutils.version import LooseVersion
from django import get_version
if LooseVersion(get_version()) < '1.4':
from django.template import Node
from django.template import NodeList
from django.template import VariableDoesNotExist
from django.template import TemplateSyntaxError
try:
from django.template.base import TextNode
except ImportError:
from django.template import TextNode
# copied from django 1.4b
class IfNode(Node):
def __init__(self, conditions_nodelists):
self.conditions_nodelists = conditions_nodelists
def __repr__(self):
return "<IfNode>"
def __iter__(self):
for _, nodelist in self.conditions_nodelists:
for node in nodelist:
yield node
@property
def nodelist(self):
return NodeList(node for _, nodelist in self.conditions_nodelists for node in nodelist)
def render(self, context):
for condition, nodelist in self.conditions_nodelists:
if condition is not None: # if / elif clause
try:
match = condition.eval(context)
except VariableDoesNotExist:
match = None
else: # else clause
match = True
if match:
return nodelist.render(context)
return ''
# copied from django 1.4b
def parse(self, parse_until=None):
if parse_until is None:
parse_until = []
nodelist = self.create_nodelist()
while self.tokens:
token = self.next_token()
# Use the raw values here for TOKEN_* for a tiny performance boost.
if token.token_type == 0: # TOKEN_TEXT
self.extend_nodelist(nodelist, TextNode(token.contents), token)
elif token.token_type == 1: # TOKEN_VAR
if not token.contents:
self.empty_variable(token)
filter_expression = self.compile_filter(token.contents)
var_node = self.create_variable_node(filter_expression)
self.extend_nodelist(nodelist, var_node, token)
elif token.token_type == 2: # TOKEN_BLOCK
try:
command = token.contents.split()[0]
except IndexError:
self.empty_block_tag(token)
if command in parse_until:
# put token back on token list so calling
# code knows why it terminated
self.prepend_token(token)
return nodelist
# execute callback function for this tag and append
# resulting node
self.enter_command(command, token)
try:
compile_func = self.tags[command]
except KeyError:
self.invalid_block_tag(token, command, parse_until)
try:
compiled_result = compile_func(self, token)
except TemplateSyntaxError as e:
if not self.compile_function_error(token, e):
raise
self.extend_nodelist(nodelist, compiled_result, token)
self.exit_command()
if parse_until:
self.unclosed_block_tag(parse_until)
return nodelist
[docs] def parser_patch(instance):
instance.__class__.parse = parse
return instance
else:
from django.template.defaulttags import IfNode
parser_patch = lambda instance: instance