forked from s434596/CatOrNot
44 lines
1.0 KiB
Python
44 lines
1.0 KiB
Python
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"""Key functions for memoizing decorators."""
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from __future__ import absolute_import
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__all__ = ('hashkey', 'typedkey')
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class _HashedTuple(tuple):
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__hashvalue = None
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def __hash__(self, hash=tuple.__hash__):
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hashvalue = self.__hashvalue
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if hashvalue is None:
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self.__hashvalue = hashvalue = hash(self)
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return hashvalue
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def __add__(self, other, add=tuple.__add__):
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return _HashedTuple(add(self, other))
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def __radd__(self, other, add=tuple.__add__):
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return _HashedTuple(add(other, self))
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_kwmark = (object(),)
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def hashkey(*args, **kwargs):
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"""Return a cache key for the specified hashable arguments."""
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if kwargs:
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return _HashedTuple(args + sum(sorted(kwargs.items()), _kwmark))
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else:
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return _HashedTuple(args)
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def typedkey(*args, **kwargs):
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"""Return a typed cache key for the specified hashable arguments."""
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key = hashkey(*args, **kwargs)
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key += tuple(type(v) for v in args)
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key += tuple(type(v) for _, v in sorted(kwargs.items()))
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return key
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