mirror of
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85 lines
2.2 KiB
Python
85 lines
2.2 KiB
Python
#!/usr/bin/env python
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# -*- mode:python; tab-width: 2; coding: utf-8 -*-
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"""Partially backported python ABC classes"""
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from __future__ import absolute_import
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try:
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from collections import MutableSet
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except ImportError:
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# Running in Python <= 2.5
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from ._abc import MutableSet
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KEY, PREV, NEXT = range(3)
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class OrderedSet(MutableSet):
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def __init__(self, iterable=None):
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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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if iterable is not None:
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self |= iterable
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def __len__(self):
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return len(self.map)
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def __contains__(self, key):
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return key in self.map
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def __getitem__(self, key):
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return list(self)[key]
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def add(self, key):
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if key not in self.map:
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end = self.end
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curr = end[PREV]
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curr[NEXT] = end[PREV] = self.map[key] = [key, curr, end]
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def discard(self, key):
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if key in self.map:
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key, prev, next = self.map.pop(key)
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prev[NEXT] = next
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next[PREV] = prev
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def __iter__(self):
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end = self.end
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curr = end[NEXT]
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while curr is not end:
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yield curr[KEY]
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curr = curr[NEXT]
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def __reversed__(self):
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end = self.end
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curr = end[PREV]
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while curr is not end:
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yield curr[KEY]
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curr = curr[PREV]
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def pop(self, last=True):
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if not self:
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raise KeyError('set is empty')
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key = reversed(self).next() if last else iter(self).next()
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self.discard(key)
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return key
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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__, list(self))
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def __eq__(self, other):
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if isinstance(other, OrderedSet):
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return len(self) == len(other) and list(self) == list(other)
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return set(self) == set(other)
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# causing "Exception TypeError: TypeError('list indices must be integers, not NoneType',)"
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# in garbage collection phase
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#def __del__(self):
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#self.clear() # remove circular references
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oset = OrderedSet
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