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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 hasattr(obj, '__call__')."""
# Local imports
from .. import pytree
from .. import fixer_base
from ..fixer_util import Call, Name, String
class FixCallable(fixer_base.BaseFix):
# 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"]
args = [func.clone(), String(', '), String("'__call__'")]
return Call(Name("hasattr"), args, prefix=node.prefix)
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