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| 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 | |
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