diff options
Diffstat (limited to 'Lib/getopt.py')
| -rw-r--r-- | Lib/getopt.py | 115 |
1 files changed, 90 insertions, 25 deletions
diff --git a/Lib/getopt.py b/Lib/getopt.py index 7feaf9d..821ea6b 100644 --- a/Lib/getopt.py +++ b/Lib/getopt.py @@ -18,30 +18,95 @@ # occurrences.) Boolean options have '' as option_argument. # (2) the list of remaining arguments (may be empty). +# Added by Lars Wirzenius (liw@iki.fi): A third argument is optional. +# If present, getopt.getopt works similar to the GNU getopt_long +# function (but optional arguments are not supported). The third +# argument should be a list of strings that name the long options. If +# the name ends '=', the argument requires an argument. + +# (While making this addition, I rewrote the whole thing.) + +import string + error = 'getopt error' -def getopt(args, options): - list = [] - while args and args[0][:1] == '-' and args[0] <> '-': - if args[0] == '--': - args = args[1:] - break - optstring, args = args[0][1:], args[1:] - while optstring <> '': - opt, optstring = optstring[0], optstring[1:] - if classify(opt, options): # May raise exception as well - if optstring == '': - if not args: - raise error, 'option -' + opt + ' requires argument' - optstring, args = args[0], args[1:] - optarg, optstring = optstring, '' - else: - optarg = '' - list.append('-' + opt, optarg) - return list, args - -def classify(opt, options): # Helper to check type of option - for i in range(len(options)): - if opt == options[i] <> ':': - return options[i+1:i+2] == ':' - raise error, 'option -' + opt + ' not recognized' +def getopt(args, shortopts, longopts = []): + list = [] + longopts = longopts[:] + longopts.sort() + while args and args[0][:1] == '-' and args[0] != '-': + if args[0] == '-' or args[0] == '--': + args = args[1:] + break + if args[0][:2] == '--': + list, args = do_longs(list, args[0][2:], + longopts, args[1:]) + else: + list, args = do_shorts(list, args[0][1:], + shortopts, args[1:]) + + return list, args + +def do_longs(list, opt, longopts, args): + try: + i = string.index(opt, '=') + opt, optarg = opt[:i], opt[i+1:] + except ValueError: + optarg = '' + + has_arg, opt = long_has_args(opt, longopts) + if has_arg: + if not optarg: + if not args: + raise error, 'option --' + opt + \ + ' requires argument' + optarg, args = args[0], args[1:] + else: + if optarg: + raise error, 'argument --' + opt + \ + ' must not have an argument' + list.append('--' + opt, optarg) + return list, args + +# Return: +# has_arg? +# full option name +def long_has_args(opt, longopts): + optlen = len(opt) + for i in range(len(longopts)): + x, y = longopts[i][:optlen], longopts[i][optlen:] + if opt != x: + continue + if y != '' and y != '=' and i+1 < len(longopts): + if opt == longopts[i+1][:optlen]: + raise error, 'option --' + opt + \ + ' not a unique prefix' + if longopts[i][-1:] == '=': + return 1, longopts[i][:-1] + return 0, longopts[i] + raise error, 'option --' + opt + ' not recognized' + +def do_shorts(list, optstring, shortopts, args): + while optstring != '': + opt, optstring = optstring[0], optstring[1:] + if short_has_arg(opt, shortopts): + if optstring == '': + if not args: + raise error, 'option -' + opt + \ + ' requires argument' + optstring, args = args[0], args[1:] + optarg, optstring = optstring, '' + else: + optarg = '' + list.append('-' + opt, optarg) + return list, args + +def short_has_arg(opt, shortopts): + for i in range(len(shortopts)): + if opt == shortopts[i] != ':': + return shortopts[i+1:i+2] == ':' + raise error, 'option -' + opt + ' not recognized' + +if __name__ == '__main__': + import sys + print getopt(sys.argv[1:], "a:b") |