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# vim: set fileencoding=utf-8 : |
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""" |
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django if templatetag patch |
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""" |
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import django |
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if django.VERSION < (1, 4): |
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from django.template import Node |
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from django.template import NodeList |
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from django.template import VariableDoesNotExist |
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from django.template import TemplateSyntaxError |
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try: |
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from django.template.base import TextNode |
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except ImportError: |
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from django.template import TextNode |
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# copied from django 1.4b |
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class IfNode(Node): |
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def __init__(self, conditions_nodelists): |
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self.conditions_nodelists = conditions_nodelists |
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def __repr__(self): |
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return "<IfNode>" |
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def __iter__(self): |
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for _, nodelist in self.conditions_nodelists: |
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for node in nodelist: |
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yield node |
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@property |
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def nodelist(self): |
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return NodeList(node for _, nodelist in self.conditions_nodelists for node in nodelist) |
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def render(self, context): |
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for condition, nodelist in self.conditions_nodelists: |
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if condition is not None: # if / elif clause |
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try: |
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match = condition.eval(context) |
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except VariableDoesNotExist: |
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match = None |
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else: # else clause |
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match = True |
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if match: |
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return nodelist.render(context) |
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return '' |
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# copied from django 1.4b |
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def parse(self, parse_until=None): |
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if parse_until is None: |
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parse_until = [] |
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nodelist = self.create_nodelist() |
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while self.tokens: |
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token = self.next_token() |
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# Use the raw values here for TOKEN_* for a tiny performance boost. |
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if token.token_type == 0: # TOKEN_TEXT |
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self.extend_nodelist(nodelist, TextNode(token.contents), token) |
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elif token.token_type == 1: # TOKEN_VAR |
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if not token.contents: |
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self.empty_variable(token) |
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filter_expression = self.compile_filter(token.contents) |
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var_node = self.create_variable_node(filter_expression) |
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self.extend_nodelist(nodelist, var_node, token) |
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elif token.token_type == 2: # TOKEN_BLOCK |
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try: |
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command = token.contents.split()[0] |
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except IndexError: |
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self.empty_block_tag(token) |
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if command in parse_until: |
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# put token back on token list so calling |
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# code knows why it terminated |
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self.prepend_token(token) |
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return nodelist |
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# execute callback function for this tag and append |
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# resulting node |
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self.enter_command(command, token) |
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try: |
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compile_func = self.tags[command] |
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except KeyError: |
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self.invalid_block_tag(token, command, parse_until) |
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try: |
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compiled_result = compile_func(self, token) |
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except TemplateSyntaxError as e: |
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if not self.compile_function_error(token, e): |
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raise |
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self.extend_nodelist(nodelist, compiled_result, token) |
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self.exit_command() |
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if parse_until: |
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self.unclosed_block_tag(parse_until) |
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return nodelist |
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def parser_patch(instance): |
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instance.__class__.parse = parse |
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return instance |
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else: |
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from django.template.defaulttags import IfNode |
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parser_patch = lambda instance: instance |
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lambdalisue /
django-permission
