forked from colonelpanic/dotfiles
52 lines
2.0 KiB
Python
52 lines
2.0 KiB
Python
import inspect
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class n_partialable(object):
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@staticmethod
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def arity_evaluation_checker(function):
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is_class = inspect.isclass(function)
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if is_class:
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function = function.__init__
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function_info = inspect.getargspec(function)
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function_args = function_info.args
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if is_class:
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# This is to handle the fact that self will get passed in automatically.
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function_args = function_args[1:]
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def evaluation_checker(*args, **kwargs):
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acceptable_kwargs = function_args[len(args):]
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kwarg_keys = set(kwargs.keys())
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# Make sure that we didn't get an argument we can't handle.
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assert kwarg_keys.issubset(acceptable_kwargs)
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needed_args = function_args[len(args):]
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if function_info.defaults:
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needed_args = needed_args[:-len(function_info.defaults)]
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return not needed_args or kwarg_keys.issuperset(needed_args)
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return evaluation_checker
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def __init__(self, function, evaluation_checker=None, args=None, kwargs=None):
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self.function = function
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self.evaluation_checker = (evaluation_checker or
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self.arity_evaluation_checker(function))
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self.args = args or ()
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self.kwargs = kwargs or {}
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def __call__(self, *args, **kwargs):
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new_args = self.args + args
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new_kwargs = self.kwargs.copy()
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new_kwargs.update(kwargs)
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if self.evaluation_checker(*new_args, **new_kwargs):
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return self.function(*new_args, **new_kwargs)
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else:
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return type(self)(self.function, self.evaluation_checker,
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new_args, new_kwargs)
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def __get__(self, obj, obj_type):
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bound = type(self)(self.function, self.evaluation_checker,
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args=self.args + (obj,), kwargs=self.kwargs)
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setattr(obj, self.function.__name__, bound)
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return bound
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n_partialable = n_partialable(n_partialable)
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