1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
|
from template.helper import import_module
_standard_context_processors = None
class ContextPopException(Exception):
"pop() has been called more times than push()"
pass
class Context(object):
"A stack container for variable context"
def __init__(self, dict_=None, autoescape=True, current_app=None):
dict_ = dict_ or {}
self.dicts = [dict_]
self.autoescape = autoescape
self.current_app = current_app
def __repr__(self):
return repr(self.dicts)
def __iter__(self):
for d in self.dicts:
yield d
def push(self):
d = {}
self.dicts = [d] + self.dicts
return d
def pop(self):
if len(self.dicts) == 1:
raise ContextPopException
return self.dicts.pop(0)
def __setitem__(self, key, value):
"Set a variable in the current context"
self.dicts[0][key] = value
def __getitem__(self, key):
"Get a variable's value, starting at the current context and going upward"
for d in self.dicts:
if key in d:
return d[key]
raise KeyError(key)
def __delitem__(self, key):
"Delete a variable from the current context"
del self.dicts[0][key]
def has_key(self, key):
for d in self.dicts:
if key in d:
return True
return False
__contains__ = has_key
def get(self, key, otherwise=None):
for d in self.dicts:
if key in d:
return d[key]
return otherwise
def update(self, other_dict):
"Like dict.update(). Pushes an entire dictionary's keys and values onto the context."
if not hasattr(other_dict, '__getitem__'):
raise TypeError('other_dict must be a mapping (dictionary-like) object.')
self.dicts = [other_dict] + self.dicts
return other_dict
class RequestContext(Context):
"""
This subclass of template.Context automatically populates itself using
the processors defined in TEMPLATE_CONTEXT_PROCESSORS.
Additional processors can be specified as a list of callables
using the "processors" keyword argument.
"""
def __init__(self, request, dict=None, processors=None, current_app=None):
Context.__init__(self, dict, current_app=current_app)
if processors is None:
processors = ()
else:
processors = tuple(processors)
for processor in get_standard_processors() + processors:
self.update(processor(request))
|
