# 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.get_prefix())