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