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python3.14
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getopt.py
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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 two functions and an exception: getopt() -- Parse command line options gnu_getopt() -- Like getopt(), but allow option and non-option arguments to be intermixed. 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. # # Peter Åstrand <astrand@lysator.liu.se> added gnu_getopt(). # # TODO for gnu_getopt(): # # - GNU getopt_long_only mechanism # - an option string with a W followed by semicolon should # treat "-W foo" as "--foo" __all__ = ["GetoptError","error","getopt","gnu_getopt"] import os try: from gettext import gettext as _ except ImportError: # Debian shims, only used by python3.X-minimal when the full stdlib is not # installed def gettext(message): return message _ = gettext # avoid the definition above looking like a translated string del gettext 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 and options that accept an optional argument followed by two colons (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 ('='). Options which accept an optional argument should be followed by an equal sign and question mark ('=?'). 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 isinstance(longopts, str): 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 gnu_getopt(args, shortopts, longopts = []): """getopt(args, options[, long_options]) -> opts, args This function works like getopt(), except that GNU style scanning mode is used by default. This means that option and non-option arguments may be intermixed. The getopt() function stops processing options as soon as a non-option argument is encountered. If the first character of the option string is '+', or if the environment variable POSIXLY_CORRECT is set, then option processing stops as soon as a non-option argument is encountered. """ opts = [] prog_args = [] if isinstance(longopts, str): longopts = [longopts] else: longopts = list(longopts) return_in_order = False if shortopts.startswith('-'): shortopts = shortopts[1:] all_options_first = False return_in_order = True # Allow options after non-option arguments? elif shortopts.startswith('+'): shortopts = shortopts[1:] all_options_first = True elif os.environ.get("POSIXLY_CORRECT"): all_options_first = True else: all_options_first = False while args: if args[0] == '--': prog_args += args[1:] break if args[0][:2] == '--': if return_in_order and prog_args: opts.append((None, prog_args)) prog_args = [] opts, args = do_longs(opts, args[0][2:], longopts, args[1:]) elif args[0][:1] == '-' and args[0] != '-': if return_in_order and prog_args: opts.append((None, prog_args)) prog_args = [] opts, args = do_shorts(opts, args[0][1:], shortopts, args[1:]) else: if all_options_first: prog_args += args break else: prog_args.append(args[0]) args = args[1:] return opts, prog_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 and has_arg != '?': if not args: raise GetoptError(_('option --%s requires argument') % opt, opt) optarg, args = args[0], args[1:] elif optarg is not None: 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 False, opt elif opt + '=' in possibilities: return True, opt elif opt + '=?' in possibilities: return '?', opt # Possibilities must be unique to be accepted if len(possibilities) > 1: raise GetoptError( _("option --%s not a unique prefix; possible options: %s") % (opt, ", ".join(possibilities)), opt, ) assert len(possibilities) == 1 unique_match = possibilities[0] if unique_match.endswith('=?'): return '?', unique_match[:-2] 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:] has_arg = short_has_arg(opt, shortopts) if has_arg: if optstring == '' and has_arg != '?': 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] != ':': if not shortopts.startswith(':', i+1): return False if shortopts.startswith('::', i+1): return '?' return True raise GetoptError(_('option -%s not recognized') % opt, opt) if __name__ == '__main__': import sys print(getopt(sys.argv[1:], "a:b", ["alpha=", "beta"]))