Edit File: _option.py
# -*- Mode: Python -*- # pygobject - Python bindings for the GObject library # Copyright (C) 2006 Johannes Hoelzl # # glib/option.py: GOption command line parser # # This library is free software; you can redistribute it and/or # modify it under the terms of the GNU Lesser General Public # License as published by the Free Software Foundation; either # version 2.1 of the License, or (at your option) any later version. # # This library is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU # Lesser General Public License for more details. # # You should have received a copy of the GNU Lesser General Public # License along with this library; if not, see <http://www.gnu.org/licenses/>. """GOption command line parser Extends optparse to use the GOptionGroup, GOptionEntry and GOptionContext objects. So it is possible to use the gtk, gnome_program and gstreamer command line groups and contexts. Use this interface instead of the raw wrappers of GOptionContext and GOptionGroup in glib. """ import sys import optparse from optparse import OptParseError, OptionError, OptionValueError, \ BadOptionError, OptionConflictError from .module import get_introspection_module if sys.version_info >= (3, 0): _basestring = str _bytes = lambda s: s.encode() else: _basestring = basestring _bytes = str from gi import _gi from gi._error import GError GLib = get_introspection_module('GLib') OPTION_CONTEXT_ERROR_QUARK = GLib.quark_to_string(GLib.option_error_quark()) __all__ = [ "OptParseError", "OptionError", "OptionValueError", "BadOptionError", "OptionConflictError", "Option", "OptionGroup", "OptionParser", "make_option", ] class Option(optparse.Option): """Represents a command line option To use the extended possibilities of the GOption API Option (and make_option) are extended with new types and attributes. Types: filename The supplied arguments are read as filename, GOption parses this type in with the GLib filename encoding. :ivar optional_arg: This does not need a arguement, but it can be supplied. :ivar hidden: The help list does not show this option :ivar in_main: This option apears in the main group, this should only be used for backwards compatibility. Use Option.REMAINING as option name to get all positional arguments. .. NOTE:: Every argument to an option is passed as utf-8 coded string, the only exception are options which use the 'filename' type, its arguments are passed as strings in the GLib filename encoding. For further help, see optparse.Option. """ TYPES = optparse.Option.TYPES + ( 'filename', ) ATTRS = optparse.Option.ATTRS + [ 'hidden', 'in_main', 'optional_arg', ] REMAINING = '--' + GLib.OPTION_REMAINING def __init__(self, *args, **kwargs): optparse.Option.__init__(self, *args, **kwargs) if not self._long_opts: raise ValueError("%s at least one long option name.") if len(self._long_opts) < len(self._short_opts): raise ValueError( "%s at least more long option names than short option names.") if not self.help: raise ValueError("%s needs a help message.", self._long_opts[0]) def _set_opt_string(self, opts): if self.REMAINING in opts: self._long_opts.append(self.REMAINING) optparse.Option._set_opt_string(self, opts) if len(self._short_opts) > len(self._long_opts): raise OptionError("goption.Option needs more long option names " "than short option names") def _to_goptionentries(self): flags = 0 if self.hidden: flags |= GLib.OptionFlags.HIDDEN if self.in_main: flags |= GLib.OptionFlags.IN_MAIN if self.takes_value(): if self.optional_arg: flags |= GLib.OptionFlags.OPTIONAL_ARG else: flags |= GLib.OptionFlags.NO_ARG if self.type == 'filename': flags |= GLib.OptionFlags.FILENAME for (long_name, short_name) in zip(self._long_opts, self._short_opts): yield (long_name[2:], _bytes(short_name[1]), flags, self.help, self.metavar) for long_name in self._long_opts[len(self._short_opts):]: yield (long_name[2:], _bytes('\0'), flags, self.help, self.metavar) class OptionGroup(optparse.OptionGroup): """A group of command line options. :param str name: The groups name, used to create the --help-{name} option :param str description: Shown as title of the groups help view :param str help_description: Shown as help to the --help-{name} option :param list option_list: The options used in this group, must be option.Option() :param dict defaults: A dicitionary of default values :param translation_domain: Sets the translation domain for gettext(). .. NOTE:: This OptionGroup does not exactly map the optparse.OptionGroup interface. There is no parser object to supply, but it is possible to set default values and option_lists. Also the default values and values are not shared with the OptionParser. To pass a OptionGroup into a function which expects a GOptionGroup (e.g. gnome_program_init() ). OptionGroup.get_option_group() can be used. For further help, see optparse.OptionGroup. """ def __init__(self, name, description, help_description="", option_list=None, defaults=None, translation_domain=None): optparse.OptionContainer.__init__(self, Option, 'error', description) self.name = name self.parser = None self.help_description = help_description if defaults: self.defaults = defaults self.values = None self.translation_domain = translation_domain if option_list: for option in option_list: self.add_option(option) def _create_option_list(self): self.option_list = [] self._create_option_mappings() def _to_goptiongroup(self, parser): def callback(option_name, option_value, group): if option_name.startswith('--'): opt = self._long_opt[option_name] else: opt = self._short_opt[option_name] try: opt.process(option_name, option_value, self.values, parser) except OptionValueError: error = sys.exc_info()[1] gerror = GError(str(error)) gerror.domain = OPTION_CONTEXT_ERROR_QUARK gerror.code = GLib.OptionError.BAD_VALUE gerror.message = str(error) raise gerror group = _gi.OptionGroup(self.name, self.description, self.help_description, callback) if self.translation_domain: group.set_translation_domain(self.translation_domain) entries = [] for option in self.option_list: entries.extend(option._to_goptionentries()) group.add_entries(entries) return group def get_option_group(self, parser=None): """ Returns the corresponding GOptionGroup object. Can be used as parameter for gnome_program_init(), gtk_init(). """ self.set_values_to_defaults() return self._to_goptiongroup(parser) def set_values_to_defaults(self): for option in self.option_list: default = self.defaults.get(option.dest) if isinstance(default, _basestring): opt_str = option.get_opt_string() self.defaults[option.dest] = option.check_value( opt_str, default) self.values = optparse.Values(self.defaults) class OptionParser(optparse.OptionParser): """Command line parser with GOption support. :param bool help_enabled: The --help, --help-all and --help-{group} options are enabled (default). :param bool ignore_unknown_options: Do not throw a exception when a option is not knwon, the option will be in the result list. .. NOTE:: The OptionParser interface is not the exactly the same as the optparse.OptionParser interface. Especially the usage parameter is only used to show the metavar of the arguements. OptionParser.add_option_group() does not only accept OptionGroup instances but also glib.OptionGroup, which is returned by gtk_get_option_group(). Only glib.option.OptionGroup and glib.option.Option instances should be passed as groups and options. For further help, see optparse.OptionParser. """ def __init__(self, *args, **kwargs): if 'option_class' not in kwargs: kwargs['option_class'] = Option self.help_enabled = kwargs.pop('help_enabled', True) self.ignore_unknown_options = kwargs.pop('ignore_unknown_options', False) optparse.OptionParser.__init__(self, add_help_option=False, *args, **kwargs) def set_usage(self, usage): if usage is None: self.usage = '' elif usage.startswith("%prog"): self.usage = usage[len("%prog"):] else: self.usage = usage def _to_goptioncontext(self, values): if self.description: parameter_string = self.usage + " - " + self.description else: parameter_string = self.usage context = _gi.OptionContext(parameter_string) context.set_help_enabled(self.help_enabled) context.set_ignore_unknown_options(self.ignore_unknown_options) for option_group in self.option_groups: if isinstance(option_group, _gi.OptionGroup): g_group = option_group else: g_group = option_group.get_option_group(self) context.add_group(g_group) def callback(option_name, option_value, group): if option_name.startswith('--'): opt = self._long_opt[option_name] else: opt = self._short_opt[option_name] opt.process(option_name, option_value, values, self) main_group = _gi.OptionGroup(None, None, None, callback) main_entries = [] for option in self.option_list: main_entries.extend(option._to_goptionentries()) main_group.add_entries(main_entries) context.set_main_group(main_group) return context def add_option_group(self, *args, **kwargs): if isinstance(args[0], _basestring): optparse.OptionParser.add_option_group(self, OptionGroup(self, *args, **kwargs)) return elif len(args) == 1 and not kwargs: if isinstance(args[0], OptionGroup): if not args[0].parser: args[0].parser = self if args[0].parser is not self: raise ValueError("invalid OptionGroup (wrong parser)") if isinstance(args[0], _gi.OptionGroup): self.option_groups.append(args[0]) return optparse.OptionParser.add_option_group(self, *args, **kwargs) def _get_all_options(self): options = self.option_list[:] for group in self.option_groups: if isinstance(group, optparse.OptionGroup): options.extend(group.option_list) return options def _process_args(self, largs, rargs, values): context = self._to_goptioncontext(values) # _process_args() returns the remaining parameters in rargs. # The prepended program name is used to all g_set_prgname() # The program name is cut away so it doesn't appear in the result. rargs[:] = context.parse([sys.argv[0]] + rargs)[1:] def parse_args(self, args=None, values=None): old_args = args or [] try: options, args = optparse.OptionParser.parse_args( self, args, values) except GError: error = sys.exc_info()[1] if error.domain != OPTION_CONTEXT_ERROR_QUARK: raise if error.code == GLib.OptionError.BAD_VALUE: raise OptionValueError(error.message) elif error.code == GLib.OptionError.UNKNOWN_OPTION: raise BadOptionError(error.message) elif error.code == GLib.OptionError.FAILED: raise OptParseError(error.message) else: raise for group in self.option_groups: for key, value in group.values.__dict__.items(): options.ensure_value(key, value) args = args[2:-len(old_args)] return options, args make_option = Option