| # -*- coding: utf-8 -*- |
| """ |
| jinja2.runtime |
| ~~~~~~~~~~~~~~ |
| |
| Runtime helpers. |
| |
| :copyright: Copyright 2008 by Armin Ronacher. |
| :license: GNU GPL. |
| """ |
| try: |
| from collections import defaultdict |
| except ImportError: |
| defaultdict = None |
| |
| |
| __all__ = ['extends', 'subscribe', 'TemplateContext'] |
| |
| |
| def extends(template, namespace): |
| """This loads a template (and evaluates it) and replaces the blocks.""" |
| |
| |
| def subscribe(obj, argument, undefined_factory): |
| """Get an item or attribute of an object.""" |
| try: |
| return getattr(obj, argument) |
| except AttributeError: |
| try: |
| return obj[argument] |
| except LookupError: |
| return undefined_factory(attr=argument) |
| |
| |
| class TemplateContext(dict): |
| |
| def __init__(self, globals, undefined_factory, filename): |
| dict.__init__(self) |
| self.globals = globals |
| self.undefined_factory = undefined_factory |
| self.filename = filename |
| self.filters = {} |
| self.tests = {} |
| |
| # if there is a default dict, dict has a __missing__ method we can use. |
| if defaultdict is None: |
| def __getitem__(self, name): |
| if name in self: |
| return self[name] |
| elif name in self.globals: |
| return self.globals[name] |
| return self.undefined_factory(name) |
| else: |
| def __missing__(self, key): |
| try: |
| return self.globals[key] |
| except: |
| return self.undefined_factory(key) |
| |
| |
| class Macro(object): |
| |
| def __init__(self, func, name, arguments, defaults, catch_all): |
| self.func = func |
| self.name = name |
| self.arguments = arguments |
| self.defaults = defaults |
| self.catch_all = catch_all |
| |
| def __call__(self, *args, **kwargs): |
| if len(args) > len(self.arguments): |
| raise TypeError('macro %r takes not more than %d argument(s).' % |
| (self.name, len(self.arguments))) |
| arguments = {} |
| # XXX: assemble arguments |
| return u''.join(self.func(*args, **kwargs)) |