# Copyright 2006 Google, Inc. All Rights Reserved.

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# Licensed to PSF under a Contributor Agreement.

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"""Fixer for exec.

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This converts usages of the exec statement into calls to a built-in

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exec() function.

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exec code in ns1, ns2 -> exec(code, ns1, ns2)

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"""

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# Local imports

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from .. import pytree

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from .. import fixer_base

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from ..fixer_util import Comma, Name, Call

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class FixExec(fixer_base.BaseFix):

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BM_compatible = True

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PATTERN = """

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exec_stmt< 'exec' a=any 'in' b=any [',' c=any] >

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|

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exec_stmt< 'exec' (not atom<'(' [any] ')'>) a=any >

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"""

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def transform(self, node, results):

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assert results

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syms = self.syms

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a = results["a"]

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b = results.get("b")

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c = results.get("c")

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args = [a.clone()]

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args[0].prefix = ""

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if b is not None:

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args.extend([Comma(), b.clone()])

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if c is not None:

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args.extend([Comma(), c.clone()])

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return Call(Name(u"exec"), args, prefix=node.prefix)

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