52 lines
1.9 KiB
Python
52 lines
1.9 KiB
Python
# 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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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()], rparen=execfile_paren)
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open_call = Node(syms.power, [Name("open"), open_args])
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read = [Node(syms.trailer, [Dot(), Name('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 = " "
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exec_str = String("'exec'", " ")
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compile_args = open_expr + [Comma(), filename_arg, Comma(), exec_str]
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compile_call = Call(Name("compile"), compile_args, "")
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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("exec"), args, prefix=node.prefix)
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