1 # Copyright 2007 Google, Inc. All Rights Reserved.

     2 # Licensed to PSF under a Contributor Agreement.

     3 

     4 """Fixer for callable().

     5 

     6 This converts callable(obj) into hasattr(obj, '__call__')."""

     7 

     8 # Local imports

     9 from .. import pytree

    10 from .. import fixer_base

    11 from ..fixer_util import Call, Name, String

    12 

    13 class FixCallable(fixer_base.BaseFix):

    14 

    15     # Ignore callable(*args) or use of keywords.

    16     # Either could be a hint that the builtin callable() is not being used.

    17     PATTERN = """

    18     power< 'callable'

    19            trailer< lpar='('

    20                     ( not(arglist | argument<any '=' any>) func=any

    21                       | func=arglist<(not argument<any '=' any>) any ','> )

    22                     rpar=')' >

    23            after=any*

    24     >

    25     """

    26 

    27     def transform(self, node, results):

    28         func = results["func"]

    29 

    30         args = [func.clone(), String(', '), String("'__call__'")]

    31         return Call(Name("hasattr"), args, prefix=node.get_prefix())