91 lines
3 KiB
Python
91 lines
3 KiB
Python
# Copyright 2004-2019 Tom Rothamel <pytom@bishoujo.us>
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#
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# Permission is hereby granted, free of charge, to any person
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# obtaining a copy of this software and associated documentation files
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# (the "Software"), to deal in the Software without restriction,
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# including without limitation the rights to use, copy, modify, merge,
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# publish, distribute, sublicense, and/or sell copies of the Software,
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# and to permit persons to whom the Software is furnished to do so,
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# subject to the following conditions:
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#
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# The above copyright notice and this permission notice shall be
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# included in all copies or substantial portions of the Software.
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#
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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from __future__ import print_function
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class Curry(object):
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"""
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Stores a callable and some arguments. When called, calls the
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callable with the stored arguments and the additional arguments
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supplied to the call.
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"""
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hash = None
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def __init__(self, callable, *args, **kwargs): # @ReservedAssignment
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self.callable = callable
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self.args = args
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self.kwargs = kwargs
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self.__doc__ = getattr(self.callable, "__doc__", None)
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def __call__(self, *args, **kwargs):
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return self.callable(*(self.args + args),
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**dict(self.kwargs.items() + kwargs.items()))
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def __repr__(self):
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return "<curry %s %r %r>" % (self.callable, self.args, self.kwargs)
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def __eq__(self, other):
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return (
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isinstance(other, Curry) and
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self.callable == other.callable and
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self.args == other.args and
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self.kwargs == other.kwargs)
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def __ne__(self, other):
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return not (self == other)
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def __hash__(self):
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if self.hash is None:
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self.hash ^= hash(self.callable) ^ hash(self.args)
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for i in self.kwargs.items():
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self.hash ^= hash(i)
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return self.hash
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def curry(fn):
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"""
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Takes a callable, and returns something that, when called, returns
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something that when called again, calls the function. So
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basically, the thing returned from here when called twice does the
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same thing as the function called once.
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"""
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rv = Curry(Curry, fn)
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rv.__doc__ = getattr(fn, "__doc__", None)
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return rv
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def partial(function, *args, **kwargs):
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"""
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Stores the arguments and keyword arguments of function, and
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returns something that, when called, calls the function with
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a combination of the supplied arguments and the arguments of
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the second call.
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"""
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return Curry(function, *args, **kwargs)
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