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