2011-02-21 18:12:23 +08:00
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from copy import copy
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2014-11-19 04:52:09 +08:00
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from django.conf import settings
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from django.utils import lru_cache
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2014-01-21 04:15:14 +08:00
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from django.utils.module_loading import import_string
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2006-05-02 09:31:56 +08:00
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2014-11-15 20:54:53 +08:00
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# Hard-coded processor for easier use of CSRF protection.
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2013-10-11 19:25:14 +08:00
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_builtin_context_processors = ('django.core.context_processors.csrf',)
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2006-05-02 09:31:56 +08:00
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2013-11-03 04:12:09 +08:00
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2006-05-02 09:31:56 +08:00
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class ContextPopException(Exception):
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"pop() has been called more times than push()"
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pass
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2013-07-16 19:11:32 +08:00
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class ContextDict(dict):
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def __init__(self, context, *args, **kwargs):
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super(ContextDict, self).__init__(*args, **kwargs)
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context.dicts.append(self)
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self.context = context
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def __enter__(self):
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return self
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def __exit__(self, *args, **kwargs):
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self.context.pop()
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2009-12-14 20:08:23 +08:00
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class BaseContext(object):
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def __init__(self, dict_=None):
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2011-04-17 12:52:31 +08:00
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self._reset_dicts(dict_)
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def _reset_dicts(self, value=None):
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2012-04-11 04:49:45 +08:00
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builtins = {'True': True, 'False': False, 'None': None}
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self.dicts = [builtins]
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2012-04-11 21:00:38 +08:00
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if value is not None:
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self.dicts.append(value)
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2006-05-02 09:31:56 +08:00
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2011-02-21 18:12:23 +08:00
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def __copy__(self):
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2011-04-17 12:52:31 +08:00
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duplicate = copy(super(BaseContext, self))
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duplicate.dicts = self.dicts[:]
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2011-02-21 18:12:23 +08:00
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return duplicate
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2006-05-02 09:31:56 +08:00
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def __repr__(self):
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return repr(self.dicts)
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def __iter__(self):
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2009-12-14 20:08:23 +08:00
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for d in reversed(self.dicts):
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2006-05-02 09:31:56 +08:00
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yield d
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2013-07-16 19:11:32 +08:00
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def push(self, *args, **kwargs):
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return ContextDict(self, *args, **kwargs)
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2006-05-02 09:31:56 +08:00
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def pop(self):
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if len(self.dicts) == 1:
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raise ContextPopException
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2009-12-14 20:08:23 +08:00
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return self.dicts.pop()
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2006-05-02 09:31:56 +08:00
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def __setitem__(self, key, value):
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"Set a variable in the current context"
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2009-12-14 20:08:23 +08:00
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self.dicts[-1][key] = value
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2006-05-02 09:31:56 +08:00
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def __getitem__(self, key):
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"Get a variable's value, starting at the current context and going upward"
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2009-12-14 20:08:23 +08:00
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for d in reversed(self.dicts):
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2007-04-26 21:30:48 +08:00
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if key in d:
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2006-05-02 09:31:56 +08:00
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return d[key]
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2006-07-04 11:21:44 +08:00
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raise KeyError(key)
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2006-05-02 09:31:56 +08:00
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def __delitem__(self, key):
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"Delete a variable from the current context"
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2009-12-14 20:08:23 +08:00
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del self.dicts[-1][key]
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2006-05-02 09:31:56 +08:00
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def has_key(self, key):
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for d in self.dicts:
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2007-04-26 21:30:48 +08:00
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if key in d:
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2006-05-02 09:31:56 +08:00
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return True
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return False
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2009-12-14 20:08:23 +08:00
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def __contains__(self, key):
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return self.has_key(key)
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2007-02-10 17:02:00 +08:00
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2006-07-04 11:21:44 +08:00
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def get(self, key, otherwise=None):
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2009-12-14 20:08:23 +08:00
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for d in reversed(self.dicts):
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2007-04-26 21:30:48 +08:00
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if key in d:
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2006-05-02 09:31:56 +08:00
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return d[key]
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return otherwise
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2011-04-17 12:52:31 +08:00
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def new(self, values=None):
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"""
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Returns a new context with the same properties, but with only the
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values given in 'values' stored.
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"""
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new_context = copy(self)
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new_context._reset_dicts(values)
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return new_context
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2014-02-16 21:50:27 +08:00
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def flatten(self):
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"""
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Returns self.dicts as one dictionary
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"""
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flat = {}
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for d in self.dicts:
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flat.update(d)
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return flat
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2014-02-15 20:45:52 +08:00
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def __eq__(self, other):
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"""
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Compares two contexts by comparing theirs 'dicts' attributes.
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"""
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if isinstance(other, BaseContext):
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2014-02-16 05:58:03 +08:00
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# because dictionaries can be put in different order
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# we have to flatten them like in templates
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2014-02-16 21:50:27 +08:00
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return self.flatten() == other.flatten()
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2014-02-15 20:45:52 +08:00
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# if it's not comparable return false
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return False
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2013-07-16 19:11:32 +08:00
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2009-12-14 20:08:23 +08:00
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class Context(BaseContext):
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"A stack container for variable context"
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2011-11-18 21:01:06 +08:00
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def __init__(self, dict_=None, autoescape=True, current_app=None,
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use_l10n=None, use_tz=None):
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2009-12-14 20:08:23 +08:00
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self.autoescape = autoescape
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self.current_app = current_app
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2011-11-18 21:01:06 +08:00
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self.use_l10n = use_l10n
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self.use_tz = use_tz
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2009-12-14 20:08:23 +08:00
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self.render_context = RenderContext()
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super(Context, self).__init__(dict_)
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2011-02-21 18:12:23 +08:00
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def __copy__(self):
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2011-04-19 10:14:07 +08:00
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duplicate = super(Context, self).__copy__()
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2011-02-21 18:12:23 +08:00
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duplicate.render_context = copy(self.render_context)
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return duplicate
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2006-05-02 09:31:56 +08:00
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def update(self, other_dict):
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2010-11-24 08:36:36 +08:00
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"Pushes other_dict to the stack of dictionaries in the Context"
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2009-03-19 00:55:59 +08:00
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if not hasattr(other_dict, '__getitem__'):
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2008-08-02 05:37:38 +08:00
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raise TypeError('other_dict must be a mapping (dictionary-like) object.')
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2009-12-14 20:08:23 +08:00
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self.dicts.append(other_dict)
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2007-12-03 07:57:22 +08:00
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return other_dict
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2006-05-02 09:31:56 +08:00
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2013-07-16 19:11:32 +08:00
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2009-12-14 20:08:23 +08:00
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class RenderContext(BaseContext):
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"""
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A stack container for storing Template state.
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RenderContext simplifies the implementation of template Nodes by providing a
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safe place to store state between invocations of a node's `render` method.
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The RenderContext also provides scoping rules that are more sensible for
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'template local' variables. The render context stack is pushed before each
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template is rendered, creating a fresh scope with nothing in it. Name
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resolution fails if a variable is not found at the top of the RequestContext
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stack. Thus, variables are local to a specific template and don't affect the
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rendering of other templates as they would if they were stored in the normal
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template context.
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"""
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def __iter__(self):
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for d in self.dicts[-1]:
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yield d
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def has_key(self, key):
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return key in self.dicts[-1]
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def get(self, key, otherwise=None):
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2013-12-19 13:42:32 +08:00
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return self.dicts[-1].get(key, otherwise)
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2009-12-14 20:08:23 +08:00
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2013-12-19 13:42:32 +08:00
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def __getitem__(self, key):
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return self.dicts[-1][key]
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2013-11-03 08:37:15 +08:00
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2013-12-20 12:43:34 +08:00
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2014-11-19 04:52:09 +08:00
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@lru_cache.lru_cache()
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2006-05-02 09:31:56 +08:00
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def get_standard_processors():
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2014-11-19 04:52:09 +08:00
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context_processors = _builtin_context_processors
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context_processors += tuple(settings.TEMPLATE_CONTEXT_PROCESSORS)
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return tuple(import_string(path) for path in context_processors)
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2006-05-02 09:31:56 +08:00
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2013-11-03 08:37:15 +08:00
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2006-05-02 09:31:56 +08:00
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class RequestContext(Context):
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"""
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This subclass of template.Context automatically populates itself using
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the processors defined in TEMPLATE_CONTEXT_PROCESSORS.
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Additional processors can be specified as a list of callables
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using the "processors" keyword argument.
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"""
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2011-11-18 21:01:06 +08:00
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def __init__(self, request, dict_=None, processors=None, current_app=None,
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use_l10n=None, use_tz=None):
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Context.__init__(self, dict_, current_app=current_app,
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use_l10n=use_l10n, use_tz=use_tz)
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2006-05-02 09:31:56 +08:00
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if processors is None:
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processors = ()
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else:
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processors = tuple(processors)
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2013-08-29 12:08:01 +08:00
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updates = dict()
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2006-05-02 09:31:56 +08:00
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for processor in get_standard_processors() + processors:
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2013-08-29 12:08:01 +08:00
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updates.update(processor(request))
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self.update(updates)
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