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106 lines
3.3 KiB
Python
106 lines
3.3 KiB
Python
# module getopt -- Standard command line processing.
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# Function getopt.getopt() has a different interface but provides the
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# similar functionality to the Unix getopt() function, with the
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# addition of long-option support. (Long option support added by Lars
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# Wirzenius <liw@iki.fi>.)
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# It has two required arguments: the first should be argv[1:] (it
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# doesn't want the script name), the second the string of option
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# letters as passed to Unix getopt() (i.e., a string of allowable
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# option letters, with options requiring an argument followed by a
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# colon).
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# The optional third argument, if present, getopt.getopt works similar
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# to the GNU getopt_long function (but optional arguments are not
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# supported). The third argument should be a list of strings that
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# name the long options. If the name ends '=', the argument requires
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# an argument.
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# It raises the exception getopt.error with a string argument if it
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# detects an error.
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# It returns two values:
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# (1) a list of pairs (option, option_argument) giving the options in
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# the order in which they were specified. (I'd use a dictionary
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# but applications may depend on option order or multiple
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# occurrences.) Boolean options have '' as option_argument.
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# (2) the list of remaining arguments (may be empty).
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import string
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error = 'getopt.error'
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def getopt(args, shortopts, longopts = []):
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list = []
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longopts = longopts[:]
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longopts.sort()
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while args and args[0][:1] == '-' and args[0] != '-':
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if args[0] == '--':
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args = args[1:]
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break
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if args[0][:2] == '--':
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list, args = do_longs(list, args[0][2:], longopts, args[1:])
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else:
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list, args = do_shorts(list, args[0][1:], shortopts, args[1:])
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return list, args
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def do_longs(list, opt, longopts, args):
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try:
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i = string.index(opt, '=')
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opt, optarg = opt[:i], opt[i+1:]
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except ValueError:
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optarg = None
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has_arg, opt = long_has_args(opt, longopts)
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if has_arg:
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if optarg is None:
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if not args:
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raise error, 'option --%s requires argument' % opt
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optarg, args = args[0], args[1:]
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elif optarg:
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raise error, 'option --%s must not have an argument' % opt
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list.append(('--' + opt, optarg or ''))
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return list, args
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# Return:
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# has_arg?
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# full option name
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def long_has_args(opt, longopts):
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optlen = len(opt)
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for i in range(len(longopts)):
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x, y = longopts[i][:optlen], longopts[i][optlen:]
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if opt != x:
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continue
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if y != '' and y != '=' and i+1 < len(longopts):
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if opt == longopts[i+1][:optlen]:
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raise error, 'option --%s not a unique prefix' % opt
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if longopts[i][-1:] in ('=', ):
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return 1, longopts[i][:-1]
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return 0, longopts[i]
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raise error, 'option --' + opt + ' not recognized'
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def do_shorts(list, optstring, shortopts, args):
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while optstring != '':
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opt, optstring = optstring[0], optstring[1:]
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if short_has_arg(opt, shortopts):
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if optstring == '':
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if not args:
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raise error, 'option -%s requires argument' % opt
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optstring, args = args[0], args[1:]
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optarg, optstring = optstring, ''
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else:
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optarg = ''
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list.append(('-' + opt, optarg))
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return list, args
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def short_has_arg(opt, shortopts):
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for i in range(len(shortopts)):
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if opt == shortopts[i] != ':':
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return shortopts[i+1:i+2] == ':'
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raise error, 'option -%s not recognized' % opt
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if __name__ == '__main__':
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import sys
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print getopt(sys.argv[1:], "a:b", ["alpha=", "beta"])
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