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"""Parser for command line options.
This module helps scripts to parse the command line arguments in
sys.argv. It supports the same conventions as the Unix getopt()
function (including the special meanings of arguments of the form `-'
and `--'). Long options similar to those supported by GNU software
may be used as well via an optional third argument. This module
provides a single function and an exception:
getopt() -- Parse command line options
GetoptError -- exception (class) raised with 'opt' attribute, which is the
option involved with the exception.
"""
# Long option support added by Lars Wirzenius <liw@iki.fi>.
# Gerrit Holl <gerrit@nl.linux.org> moved the string-based exceptions
# to class-based exceptions.
__all__ = ["GetoptError","error","getopt"]
class GetoptError(Exception):
opt = ''
msg = ''
def __init__(self, msg, opt):
self.msg = msg
self.opt = opt
Exception.__init__(self, msg, opt)
def __str__(self):
return self.msg
error = GetoptError # backward compatibility
def getopt(args, shortopts, longopts = []):
"""getopt(args, options[, long_options]) -> opts, args
Parses command line options and parameter list. args is the
argument list to be parsed, without the leading reference to the
running program. Typically, this means "sys.argv[1:]". shortopts
is the string of option letters that the script wants to
recognize, with options that require an argument followed by a
colon (i.e., the same format that Unix getopt() uses). If
specified, longopts is a list of strings with the names of the
long options which should be supported. The leading '--'
characters should not be included in the option name. Options
which require an argument should be followed by an equal sign
('=').
The return value consists of two elements: the first is a list of
(option, value) pairs; the second is the list of program arguments
left after the option list was stripped (this is a trailing slice
of the first argument). Each option-and-value pair returned has
the option as its first element, prefixed with a hyphen (e.g.,
'-x'), and the option argument as its second element, or an empty
string if the option has no argument. The options occur in the
list in the same order in which they were found, thus allowing
multiple occurrences. Long and short options may be mixed.
"""
opts = []
if type(longopts) == type(""):
longopts = [longopts]
else:
longopts = list(longopts)
while args and args[0].startswith('-') and args[0] != '-':
if args[0] == '--':
args = args[1:]
break
if args[0].startswith('--'):
opts, args = do_longs(opts, args[0][2:], longopts, args[1:])
else:
opts, args = do_shorts(opts, args[0][1:], shortopts, args[1:])
return opts, args
def do_longs(opts, opt, longopts, args):
try:
i = opt.index('=')
except ValueError:
optarg = None
else:
opt, optarg = opt[:i], opt[i+1:]
has_arg, opt = long_has_args(opt, longopts)
if has_arg:
if optarg is None:
if not args:
raise GetoptError('option --%s requires argument' % opt, opt)
optarg, args = args[0], args[1:]
elif optarg:
raise GetoptError('option --%s must not have an argument' % opt, opt)
opts.append(('--' + opt, optarg or ''))
return opts, args
# Return:
# has_arg?
# full option name
def long_has_args(opt, longopts):
possibilities = [o for o in longopts if o.startswith(opt)]
if not possibilities:
raise GetoptError('option --%s not recognized' % opt, opt)
# Is there an exact match?
if opt in possibilities:
return 0, opt
elif opt + '=' in possibilities:
return 1, opt
# No exact match, so better be unique.
if len(possibilities) > 1:
# XXX since possibilities contains all valid continuations, might be
# nice to work them into the error msg
raise GetoptError('option --%s not a unique prefix' % opt, opt)
assert len(possibilities) == 1
unique_match = possibilities[0]
has_arg = unique_match.endswith('=')
if has_arg:
unique_match = unique_match[:-1]
return has_arg, unique_match
def do_shorts(opts, optstring, shortopts, args):
while optstring != '':
opt, optstring = optstring[0], optstring[1:]
if short_has_arg(opt, shortopts):
if optstring == '':
if not args:
raise GetoptError('option -%s requires argument' % opt,
opt)
optstring, args = args[0], args[1:]
optarg, optstring = optstring, ''
else:
optarg = ''
opts.append(('-' + opt, optarg))
return opts, args
def short_has_arg(opt, shortopts):
for i in range(len(shortopts)):
if opt == shortopts[i] != ':':
return shortopts.startswith(':', i+1)
raise GetoptError('option -%s not recognized' % opt, opt)
if __name__ == '__main__':
import sys
print getopt(sys.argv[1:], "a:b", ["alpha=", "beta"])
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