Lib/getopt.py

   1 # module getopt -- Standard command line processing.
   2
   3 # Function getopt.getopt() has a different interface but provides the
   4 # same functionality as the Unix getopt() function.
   5
   6 # It has two arguments: the first should be argv[1:] (it doesn't want
   7 # the script name), the second the string of option letters as passed
   8 # to Unix getopt() (i.e., a string of allowable option letters, with
   9 # options requiring an argument followed by a colon).
  10
  11 # It raises the exception getopt.error with a string argument if it
  12 # detects an error.
  13
  14 # It returns two items:
  15 # (1)   a list of pairs (option, option_argument) giving the options in
  16 #       the order in which they were specified.  (I'd use a dictionary
  17 #       but applications may depend on option order or multiple
  18 #       occurrences.)  Boolean options have '' as option_argument.
  19 # (2)   the list of remaining arguments (may be empty).
  20
  21 error = 'getopt error'
  22
  23 def getopt(args, options):
  24     list = []
  25     while args and args[0][:1] == '-' and args[0] <> '-':
  26         if args[0] == '--':
  27             args = args[1:]
  28             break
  29         optstring, args = args[0][1:], args[1:]
  30         while optstring <> '':
  31             opt, optstring = optstring[0], optstring[1:]
  32             if classify(opt, options): # May raise exception as well
  33                 if optstring == '':
  34                     if not args:
  35                         raise error, 'option -' + opt + ' requires argument'
  36                     optstring, args = args[0], args[1:]
  37                 optarg, optstring = optstring, ''
  38             else:
  39                 optarg = ''
  40             list.append('-' + opt, optarg)
  41     return list, args
  42
  43 def classify(opt, options): # Helper to check type of option
  44     for i in range(len(options)):
  45         if opt == options[i] <> ':':
  46             return options[i+1:i+2] == ':'
  47     raise error, 'option -' + opt + ' not recognized'