78 lines
2.4 KiB
Python
78 lines
2.4 KiB
Python
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# subprocess - Subprocesses with accessible I/O streams
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#
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# For more information about this module, see PEP 324.
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#
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# This module should remain compatible with Python 2.2, see PEP 291.
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#
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# Copyright (c) 2003-2005 by Peter Astrand <astrand@lysator.liu.se>
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#
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# Licensed to PSF under a Contributor Agreement.
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# See http://www.python.org/2.4/license for licensing details.
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def list2cmdline(seq):
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"""
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Translate a sequence of arguments into a command line
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string, using the same rules as the MS C runtime:
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1) Arguments are delimited by white space, which is either a
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space or a tab.
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2) A string surrounded by double quotation marks is
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interpreted as a single argument, regardless of white space
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contained within. A quoted string can be embedded in an
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argument.
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3) A double quotation mark preceded by a backslash is
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interpreted as a literal double quotation mark.
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4) Backslashes are interpreted literally, unless they
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immediately precede a double quotation mark.
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5) If backslashes immediately precede a double quotation mark,
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every pair of backslashes is interpreted as a literal
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backslash. If the number of backslashes is odd, the last
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backslash escapes the next double quotation mark as
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described in rule 3.
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"""
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# See
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# http://msdn.microsoft.com/library/en-us/vccelng/htm/progs_12.asp
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result = []
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needquote = False
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for arg in seq:
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bs_buf = []
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# Add a space to separate this argument from the others
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if result:
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result.append(' ')
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needquote = (" " in arg) or ("\t" in arg) or ("|" in arg) or arg == ""
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if needquote:
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result.append('"')
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for c in arg:
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if c == '\\':
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# Don't know if we need to double yet.
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bs_buf.append(c)
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elif c == '"':
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# Double backspaces.
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result.append('\\' * len(bs_buf)*2)
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bs_buf = []
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result.append('\\"')
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else:
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# Normal char
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if bs_buf:
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result.extend(bs_buf)
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bs_buf = []
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result.append(c)
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# Add remaining backspaces, if any.
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if bs_buf:
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result.extend(bs_buf)
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if needquote:
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result.extend(bs_buf)
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result.append('"')
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return ''.join(result)
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