OLD | NEW |
| (Empty) |
1 """Drop-in replacement for collections.OrderedDict by Raymond Hettinger | |
2 | |
3 http://code.activestate.com/recipes/576693/ | |
4 | |
5 """ | |
6 from UserDict import DictMixin | |
7 | |
8 # Modified from original to support Python 2.4, see | |
9 # http://code.google.com/p/simplejson/issues/detail?id=53 | |
10 try: | |
11 all | |
12 except NameError: | |
13 def all(seq): | |
14 for elem in seq: | |
15 if not elem: | |
16 return False | |
17 return True | |
18 | |
19 class OrderedDict(dict, DictMixin): | |
20 | |
21 def __init__(self, *args, **kwds): | |
22 if len(args) > 1: | |
23 raise TypeError('expected at most 1 arguments, got %d' % len(args)) | |
24 try: | |
25 self.__end | |
26 except AttributeError: | |
27 self.clear() | |
28 self.update(*args, **kwds) | |
29 | |
30 def clear(self): | |
31 self.__end = end = [] | |
32 end += [None, end, end] # sentinel node for doubly linked list | |
33 self.__map = {} # key --> [key, prev, next] | |
34 dict.clear(self) | |
35 | |
36 def __setitem__(self, key, value): | |
37 if key not in self: | |
38 end = self.__end | |
39 curr = end[1] | |
40 curr[2] = end[1] = self.__map[key] = [key, curr, end] | |
41 dict.__setitem__(self, key, value) | |
42 | |
43 def __delitem__(self, key): | |
44 dict.__delitem__(self, key) | |
45 key, prev, next = self.__map.pop(key) | |
46 prev[2] = next | |
47 next[1] = prev | |
48 | |
49 def __iter__(self): | |
50 end = self.__end | |
51 curr = end[2] | |
52 while curr is not end: | |
53 yield curr[0] | |
54 curr = curr[2] | |
55 | |
56 def __reversed__(self): | |
57 end = self.__end | |
58 curr = end[1] | |
59 while curr is not end: | |
60 yield curr[0] | |
61 curr = curr[1] | |
62 | |
63 def popitem(self, last=True): | |
64 if not self: | |
65 raise KeyError('dictionary is empty') | |
66 # Modified from original to support Python 2.4, see | |
67 # http://code.google.com/p/simplejson/issues/detail?id=53 | |
68 if last: | |
69 key = reversed(self).next() | |
70 else: | |
71 key = iter(self).next() | |
72 value = self.pop(key) | |
73 return key, value | |
74 | |
75 def __reduce__(self): | |
76 items = [[k, self[k]] for k in self] | |
77 tmp = self.__map, self.__end | |
78 del self.__map, self.__end | |
79 inst_dict = vars(self).copy() | |
80 self.__map, self.__end = tmp | |
81 if inst_dict: | |
82 return (self.__class__, (items,), inst_dict) | |
83 return self.__class__, (items,) | |
84 | |
85 def keys(self): | |
86 return list(self) | |
87 | |
88 setdefault = DictMixin.setdefault | |
89 update = DictMixin.update | |
90 pop = DictMixin.pop | |
91 values = DictMixin.values | |
92 items = DictMixin.items | |
93 iterkeys = DictMixin.iterkeys | |
94 itervalues = DictMixin.itervalues | |
95 iteritems = DictMixin.iteritems | |
96 | |
97 def __repr__(self): | |
98 if not self: | |
99 return '%s()' % (self.__class__.__name__,) | |
100 return '%s(%r)' % (self.__class__.__name__, self.items()) | |
101 | |
102 def copy(self): | |
103 return self.__class__(self) | |
104 | |
105 @classmethod | |
106 def fromkeys(cls, iterable, value=None): | |
107 d = cls() | |
108 for key in iterable: | |
109 d[key] = value | |
110 return d | |
111 | |
112 def __eq__(self, other): | |
113 if isinstance(other, OrderedDict): | |
114 return len(self)==len(other) and \ | |
115 all(p==q for p, q in zip(self.items(), other.items())) | |
116 return dict.__eq__(self, other) | |
117 | |
118 def __ne__(self, other): | |
119 return not self == other | |
OLD | NEW |