# Copyright 2007 Google, Inc. All Rights Reserved.
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# Licensed to PSF under a Contributor Agreement.
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"""Fixer for callable().
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This converts callable(obj) into isinstance(obj, collections.Callable), adding a
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collections import if needed."""
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# Local imports
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from lib2to3 import fixer_base
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from lib2to3.fixer_util import Call, Name, String, Attr, touch_import
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class FixCallable(fixer_base.BaseFix):
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BM_compatible = True
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order = "pre"
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# Ignore callable(*args) or use of keywords.
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# Either could be a hint that the builtin callable() is not being used.
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PATTERN = """
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power< 'callable'
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trailer< lpar='('
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( not(arglist | argument<any '=' any>) func=any
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| func=arglist<(not argument<any '=' any>) any ','> )
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rpar=')' >
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after=any*
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>
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"""
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def transform(self, node, results):
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func = results['func']
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touch_import(None, u'collections', node=node)
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args = [func.clone(), String(u', ')]
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args.extend(Attr(Name(u'collections'), Name(u'Callable')))
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return Call(Name(u'isinstance'), args, prefix=node.prefix)
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