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60 lines
1.3 KiB
Python
60 lines
1.3 KiB
Python
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"""
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structures.py
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~~~~~~~~~~~~~
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Defines structures used by the httpcache module.
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"""
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class RecentOrderedDict(dict):
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"""
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A custom variant of the dictionary that ensures that the object most
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recently inserted _or_ retrieved from the dictionary is enumerated first.
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"""
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def __init__(self):
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self._data = {}
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self._order = []
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def __setitem__(self, key, value):
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if key in self._data:
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self._order.remove(key)
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self._order.append(key)
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self._data[key] = value
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def __getitem__(self, key):
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value = self._data[key]
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self._order.remove(key)
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self._order.append(key)
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return value
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def __delitem__(self, key):
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del self._data[key]
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self._order.remove(key)
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def __iter__(self):
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return self._order
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def __len__(self):
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return len(self._order)
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def __contains__(self, value):
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return self._data.__contains__(value)
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def items(self):
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return [(key, self._data[key]) for key in self._order]
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def keys(self):
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return self._order
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def values(self):
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return [self._data[key] for key in self._order]
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def clear(self):
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self._data = {}
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self._order = []
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def copy(self):
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c = RecentOrderedDict()
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c._data = self._data.copy()
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c._order = self._order[:]
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