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"""Ordered dict implementation"""
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from UserDict import DictMixin
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class OrderedDict(dict, DictMixin):
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def __init__(self, *args, **kwds):
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if len(args) > 1:
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raise TypeError('expected at most 1 arguments, got %d' % len(args))
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try:
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self.__end
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except AttributeError:
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self.clear()
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self.update(*args, **kwds)
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def clear(self):
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self.__end = end = []
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end += [None, end, end] # sentinel node for doubly linked list
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self.__map = {} # key --> [key, prev, next]
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dict.clear(self)
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def __setitem__(self, key, value):
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if key not in self:
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end = self.__end
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curr = end[1]
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curr[2] = end[1] = self.__map[key] = [key, curr, end]
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dict.__setitem__(self, key, value)
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def __delitem__(self, key):
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dict.__delitem__(self, key)
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key, prev, next = self.__map.pop(key)
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prev[2] = next
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next[1] = prev
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def __iter__(self):
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end = self.__end
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curr = end[2]
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while curr is not end:
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yield curr[0]
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curr = curr[2]
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def __reversed__(self):
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end = self.__end
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curr = end[1]
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while curr is not end:
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yield curr[0]
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curr = curr[1]
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def popitem(self, last=True):
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if not self:
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raise KeyError('dictionary is empty')
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if last:
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key = reversed(self).next()
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else:
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key = iter(self).next()
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value = self.pop(key)
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return key, value
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def __reduce__(self):
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items = [[k, self[k]] for k in self]
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tmp = self.__map, self.__end
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del self.__map, self.__end
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inst_dict = vars(self).copy()
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self.__map, self.__end = tmp
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if inst_dict:
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return (self.__class__, (items,), inst_dict)
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return self.__class__, (items,)
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def keys(self):
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return list(self)
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setdefault = DictMixin.setdefault
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update = DictMixin.update
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pop = DictMixin.pop
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values = DictMixin.values
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items = DictMixin.items
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iterkeys = DictMixin.iterkeys
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itervalues = DictMixin.itervalues
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iteritems = DictMixin.iteritems
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def __repr__(self):
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if not self:
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return '%s()' % (self.__class__.__name__,)
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return '%s(%r)' % (self.__class__.__name__, self.items())
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def copy(self):
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return self.__class__(self)
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@classmethod
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def fromkeys(cls, iterable, value=None):
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d = cls()
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for key in iterable:
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d[key] = value
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return d
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def __eq__(self, other):
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if isinstance(other, OrderedDict):
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return len(self) == len(other) and self.items() == other.items()
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return dict.__eq__(self, other)
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def __ne__(self, other):
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return not self == other
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