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to reflect the new license. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. llvm-svn: 351636
66 lines
2.1 KiB
Python
66 lines
2.1 KiB
Python
# -*- coding: utf-8 -*-
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# Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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# See https://llvm.org/LICENSE.txt for license information.
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# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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""" This module implements basic shell escaping/unescaping methods. """
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import re
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import shlex
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__all__ = ['encode', 'decode']
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def encode(command):
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""" Takes a command as list and returns a string. """
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def needs_quote(word):
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""" Returns true if arguments needs to be protected by quotes.
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Previous implementation was shlex.split method, but that's not good
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for this job. Currently is running through the string with a basic
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state checking. """
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reserved = {' ', '$', '%', '&', '(', ')', '[', ']', '{', '}', '*', '|',
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'<', '>', '@', '?', '!'}
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state = 0
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for current in word:
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if state == 0 and current in reserved:
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return True
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elif state == 0 and current == '\\':
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state = 1
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elif state == 1 and current in reserved | {'\\'}:
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state = 0
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elif state == 0 and current == '"':
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state = 2
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elif state == 2 and current == '"':
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state = 0
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elif state == 0 and current == "'":
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state = 3
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elif state == 3 and current == "'":
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state = 0
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return state != 0
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def escape(word):
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""" Do protect argument if that's needed. """
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table = {'\\': '\\\\', '"': '\\"'}
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escaped = ''.join([table.get(c, c) for c in word])
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return '"' + escaped + '"' if needs_quote(word) else escaped
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return " ".join([escape(arg) for arg in command])
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def decode(string):
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""" Takes a command string and returns as a list. """
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def unescape(arg):
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""" Gets rid of the escaping characters. """
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if len(arg) >= 2 and arg[0] == arg[-1] and arg[0] == '"':
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arg = arg[1:-1]
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return re.sub(r'\\(["\\])', r'\1', arg)
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return re.sub(r'\\([\\ $%&\(\)\[\]\{\}\*|<>@?!])', r'\1', arg)
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return [unescape(arg) for arg in shlex.split(string)]
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