116 lines
4.0 KiB
Python
116 lines
4.0 KiB
Python
from django.core.exceptions import ImproperlyConfigured
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from django.utils.importlib import import_module
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# Cache of actual callables.
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_standard_context_processors = None
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# We need the CSRF processor no matter what the user has in their settings,
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# because otherwise it is a security vulnerability, and we can't afford to leave
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# this to human error or failure to read migration instructions.
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_builtin_context_processors = ('django.core.context_processors.csrf',)
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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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class Context(object):
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"A stack container for variable context"
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def __init__(self, dict_=None, autoescape=True, current_app=None):
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dict_ = dict_ or {}
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self.dicts = [dict_]
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self.autoescape = autoescape
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self.current_app = current_app
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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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for d in self.dicts:
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yield d
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def push(self):
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d = {}
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self.dicts = [d] + self.dicts
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return d
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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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return self.dicts.pop(0)
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def __setitem__(self, key, value):
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"Set a variable in the current context"
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self.dicts[0][key] = value
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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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for d in self.dicts:
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if key in d:
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return d[key]
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raise KeyError(key)
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def __delitem__(self, key):
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"Delete a variable from the current context"
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del self.dicts[0][key]
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def has_key(self, key):
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for d in self.dicts:
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if key in d:
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return True
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return False
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__contains__ = has_key
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def get(self, key, otherwise=None):
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for d in self.dicts:
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if key in d:
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return d[key]
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return otherwise
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def update(self, other_dict):
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"Like dict.update(). Pushes an entire dictionary's keys and values onto the context."
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if not hasattr(other_dict, '__getitem__'):
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raise TypeError('other_dict must be a mapping (dictionary-like) object.')
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self.dicts = [other_dict] + self.dicts
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return other_dict
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# This is a function rather than module-level procedural code because we only
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# want it to execute if somebody uses RequestContext.
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def get_standard_processors():
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from django.conf import settings
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global _standard_context_processors
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if _standard_context_processors is None:
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processors = []
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collect = []
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collect.extend(_builtin_context_processors)
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collect.extend(settings.TEMPLATE_CONTEXT_PROCESSORS)
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for path in collect:
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i = path.rfind('.')
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module, attr = path[:i], path[i+1:]
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try:
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mod = import_module(module)
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except ImportError, e:
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raise ImproperlyConfigured('Error importing request processor module %s: "%s"' % (module, e))
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try:
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func = getattr(mod, attr)
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except AttributeError:
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raise ImproperlyConfigured('Module "%s" does not define a "%s" callable request processor' % (module, attr))
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processors.append(func)
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_standard_context_processors = tuple(processors)
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return _standard_context_processors
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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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def __init__(self, request, dict=None, processors=None, current_app=None):
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Context.__init__(self, dict, current_app=current_app)
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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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for processor in get_standard_processors() + processors:
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self.update(processor(request))
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