# Copyright 2006 Google, Inc. All Rights Reserved.

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# Licensed to PSF under a Contributor Agreement.

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"""Fixer for execfile.

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This converts usages of the execfile function into calls to the built-in

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exec() function.

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"""

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from .. import fixer_base

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from ..fixer_util import (Comma, Name, Call, LParen, RParen, Dot, Node,

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ArgList, String, syms)

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class FixExecfile(fixer_base.BaseFix):

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BM_compatible = True

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PATTERN = """

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power< 'execfile' trailer< '(' arglist< filename=any [',' globals=any [',' locals=any ] ] > ')' > >

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|

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power< 'execfile' trailer< '(' filename=any ')' > >

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"""

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def transform(self, node, results):

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assert results

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filename = results["filename"]

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globals = results.get("globals")

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locals = results.get("locals")

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# Copy over the prefix from the right parentheses end of the execfile

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# call.

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execfile_paren = node.children[-1].children[-1].clone()

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# Construct open().read().

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open_args = ArgList([filename.clone(), Comma(), String('"rb"', ' ')],

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rparen=execfile_paren)

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open_call = Node(syms.power, [Name(u"open"), open_args])

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read = [Node(syms.trailer, [Dot(), Name(u'read')]),

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Node(syms.trailer, [LParen(), RParen()])]

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open_expr = [open_call] + read

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# Wrap the open call in a compile call. This is so the filename will be

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# preserved in the execed code.

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filename_arg = filename.clone()

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filename_arg.prefix = u" "

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exec_str = String(u"'exec'", u" ")

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compile_args = open_expr + [Comma(), filename_arg, Comma(), exec_str]

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compile_call = Call(Name(u"compile"), compile_args, u"")

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# Finally, replace the execfile call with an exec call.

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args = [compile_call]

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if globals is not None:

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

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if locals is not None:

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

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

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