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https://github.com/ARM-software/workload-automation.git
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59 lines
2.1 KiB
Python
59 lines
2.1 KiB
Python
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"""Robust apply mechanism.
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Provides a function 'call', which can sort out what arguments a given
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callable object can take, and subset the given arguments to match only
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those which are acceptable.
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"""
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def function(receiver):
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"""Get function-like callable object for given receiver.
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returns (function_or_method, codeObject, fromMethod)
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If fromMethod is true, then the callable already has its first
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argument bound.
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"""
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if hasattr(receiver, '__call__'):
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# receiver is a class instance; assume it is callable.
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# Reassign receiver to the actual method that will be called.
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c = receiver.__call__
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if hasattr(c, 'im_func') or hasattr(c, 'im_code'):
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receiver = c
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if hasattr(receiver, 'im_func'):
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# receiver is an instance-method.
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return receiver, receiver.im_func.func_code, 1
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elif not hasattr(receiver, 'func_code'):
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raise ValueError(
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'unknown reciever type %s %s' % (receiver, type(receiver)))
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return receiver, receiver.func_code, 0
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def robust_apply(receiver, signature, *arguments, **named):
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"""Call receiver with arguments and appropriate subset of named.
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``signature`` is the callable used to determine the call signature
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of the receiver, in case ``receiver`` is a callable wrapper of the
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actual receiver."""
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signature, code_object, startIndex = function(signature)
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acceptable = code_object.co_varnames[
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startIndex + len(arguments):
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code_object.co_argcount
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]
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for name in code_object.co_varnames[
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startIndex:startIndex + len(arguments)
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]:
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if named.has_key(name):
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raise TypeError(
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'Argument %r specified both positionally '
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'and as a keyword for calling %r'
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% (name, signature)
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)
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if not (code_object.co_flags & 8):
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# fc does not have a **kwds type parameter, therefore
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# remove unacceptable arguments.
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for arg in named.keys():
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if arg not in acceptable:
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del named[arg]
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return receiver(*arguments, **named)
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