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# list2cmdline - Utility to escape nt commandline arguments
#
# Copyright (c) 2003-2005 by Peter Astrand <astrand@lysator.liu.se>
#
# Licensed to PSF under a Contributor Agreement.
# See http://www.python.org/2.4/license for licensing details.
def list2cmdline(seq):
"""
Translate a sequence of arguments into a command line
string, using the same rules as the MS C runtime:
1) Arguments are delimited by white space, which is either a
space or a tab.
2) A string surrounded by double quotation marks is
interpreted as a single argument, regardless of white space
contained within. A quoted string can be embedded in an
argument.
3) A double quotation mark preceded by a backslash is
interpreted as a literal double quotation mark.
4) Backslashes are interpreted literally, unless they
immediately precede a double quotation mark.
5) If backslashes immediately precede a double quotation mark,
every pair of backslashes is interpreted as a literal
backslash. If the number of backslashes is odd, the last
backslash escapes the next double quotation mark as
described in rule 3.
Extracted from subprocess.py so that distutils spawn.py can
use it too.
"""
# See
# http://msdn.microsoft.com/en-us/library/17w5ykft.aspx
# or search http://msdn.microsoft.com for
# "Parsing C++ Command-Line Arguments"
result = []
needquote = False
for arg in seq:
bs_buf = []
# Add a space to separate this argument from the others
if result:
result.append(' ')
needquote = (" " in arg) or ("\t" in arg) or not arg
if needquote:
result.append('"')
for c in arg:
if c == '\\':
# Don't know if we need to double yet.
bs_buf.append(c)
elif c == '"':
# Double backslashes.
result.append('\\' * len(bs_buf)*2)
bs_buf = []
result.append('\\"')
else:
# Normal char
if bs_buf:
result.extend(bs_buf)
bs_buf = []
result.append(c)
# Add remaining backslashes, if any.
if bs_buf:
result.extend(bs_buf)
if needquote:
result.extend(bs_buf)
result.append('"')
return ''.join(result)
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