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Rewritten by Lars Wizenius to add long options

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This commit is contained in:
Guido van Rossum 1996-09-09 15:48:24 +00:00
parent 8727df4623
commit 2c349bbc77
1 changed files with 89 additions and 24 deletions
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113
Lib/getopt.py
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@ -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 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:])
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'
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")