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my_argparse.py
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# Copyright 2012-2019, Andrey Kislyuk and argcomplete contributors. # Licensed under the Apache License. See https://github.com/kislyuk/argcomplete for more info. from argparse import ArgumentParser, ArgumentError, SUPPRESS, _SubParsersAction from argparse import OPTIONAL, ZERO_OR_MORE, ONE_OR_MORE, REMAINDER, PARSER from argparse import _get_action_name, _ _num_consumed_args = {} def action_is_satisfied(action): ''' Returns False if the parse would raise an error if no more arguments are given to this action, True otherwise. ''' num_consumed_args = _num_consumed_args.get(action, 0) if action.nargs in [OPTIONAL, ZERO_OR_MORE, REMAINDER]: return True if action.nargs == ONE_OR_MORE: return num_consumed_args >= 1 if action.nargs == PARSER: # Not sure what this should be, but this previously always returned False # so at least this won't break anything that wasn't already broken. return False if action.nargs is None: return num_consumed_args == 1 assert isinstance(action.nargs, int), 'failed to handle a possible nargs value: %r' % action.nargs return num_consumed_args == action.nargs def action_is_open(action): ''' Returns True if action could consume more arguments (i.e., its pattern is open). ''' num_consumed_args = _num_consumed_args.get(action, 0) if action.nargs in [ZERO_OR_MORE, ONE_OR_MORE, PARSER, REMAINDER]: return True if action.nargs == OPTIONAL or action.nargs is None: return num_consumed_args == 0 assert isinstance(action.nargs, int), 'failed to handle a possible nargs value: %r' % action.nargs return num_consumed_args < action.nargs def action_is_greedy(action, isoptional=False): ''' Returns True if action will necessarily consume the next argument. isoptional indicates whether the argument is an optional (starts with -). ''' num_consumed_args = _num_consumed_args.get(action, 0) if action.option_strings: if not isoptional and not action_is_satisfied(action): return True return action.nargs == REMAINDER else: return action.nargs == REMAINDER and num_consumed_args >= 1 class IntrospectiveArgumentParser(ArgumentParser): ''' The following is a verbatim copy of ArgumentParser._parse_known_args (Python 2.7.3), except for the lines that contain the string "Added by argcomplete". ''' def _parse_known_args(self, arg_strings, namespace): _num_consumed_args.clear() # Added by argcomplete self._argcomplete_namespace = namespace self.active_actions = [] # Added by argcomplete # replace arg strings that are file references if self.fromfile_prefix_chars is not None: arg_strings = self._read_args_from_files(arg_strings) # map all mutually exclusive arguments to the other arguments # they can't occur with action_conflicts = {} self._action_conflicts = action_conflicts # Added by argcomplete for mutex_group in self._mutually_exclusive_groups: group_actions = mutex_group._group_actions for i, mutex_action in enumerate(mutex_group._group_actions): conflicts = action_conflicts.setdefault(mutex_action, []) conflicts.extend(group_actions[:i]) conflicts.extend(group_actions[i + 1:]) # find all option indices, and determine the arg_string_pattern # which has an 'O' if there is an option at an index, # an 'A' if there is an argument, or a '-' if there is a '--' option_string_indices = {} arg_string_pattern_parts = [] arg_strings_iter = iter(arg_strings) for i, arg_string in enumerate(arg_strings_iter): # all args after -- are non-options if arg_string == '--': arg_string_pattern_parts.append('-') for arg_string in arg_strings_iter: arg_string_pattern_parts.append('A') # otherwise, add the arg to the arg strings # and note the index if it was an option else: option_tuple = self._parse_optional(arg_string) if option_tuple is None: pattern = 'A' else: option_string_indices[i] = option_tuple pattern = 'O' arg_string_pattern_parts.append(pattern) # join the pieces together to form the pattern arg_strings_pattern = ''.join(arg_string_pattern_parts) # converts arg strings to the appropriate and then takes the action seen_actions = set() seen_non_default_actions = set() self._seen_non_default_actions = seen_non_default_actions # Added by argcomplete def take_action(action, argument_strings, option_string=None): seen_actions.add(action) argument_values = self._get_values(action, argument_strings) # error if this argument is not allowed with other previously # seen arguments, assuming that actions that use the default # value don't really count as "present" if argument_values is not action.default: seen_non_default_actions.add(action) for conflict_action in action_conflicts.get(action, []): if conflict_action in seen_non_default_actions: msg = _('not allowed with argument %s') action_name = _get_action_name(conflict_action) raise ArgumentError(action, msg % action_name) # take the action if we didn't receive a SUPPRESS value # (e.g. from a default) if argument_values is not SUPPRESS \ or isinstance(action, _SubParsersAction): try: action(self, namespace, argument_values, option_string) except: # Begin added by argcomplete # When a subparser action is taken and fails due to incomplete arguments, it does not merge the # contents of its parsed namespace into the parent namespace. Do that here to allow completers to # access the partially parsed arguments for the subparser. if isinstance(action, _SubParsersAction): subnamespace = action._name_parser_map[argument_values[0]]._argcomplete_namespace for key, value in vars(subnamespace).items(): setattr(namespace, key, value) # End added by argcomplete raise # function to convert arg_strings into an optional action def consume_optional(start_index): # get the optional identified at this index option_tuple = option_string_indices[start_index] action, option_string, explicit_arg = option_tuple # identify additional optionals in the same arg string # (e.g. -xyz is the same as -x -y -z if no args are required) match_argument = self._match_argument action_tuples = [] while True: # if we found no optional action, skip it if action is None: extras.append(arg_strings[start_index]) return start_index + 1 # if there is an explicit argument, try to match the # optional's string arguments to only this if explicit_arg is not None: arg_count = match_argument(action, 'A') # if the action is a single-dash option and takes no # arguments, try to parse more single-dash options out # of the tail of the option string chars = self.prefix_chars if arg_count == 0 and option_string[1] not in chars: action_tuples.append((action, [], option_string)) char = option_string[0] option_string = char + explicit_arg[0] new_explicit_arg = explicit_arg[1:] or None optionals_map = self._option_string_actions if option_string in optionals_map: action = optionals_map[option_string] explicit_arg = new_explicit_arg else: msg = _('ignored explicit argument %r') raise ArgumentError(action, msg % explicit_arg) # if the action expect exactly one argument, we've # successfully matched the option; exit the loop elif arg_count == 1: stop = start_index + 1 args = [explicit_arg] action_tuples.append((action, args, option_string)) break # error if a double-dash option did not use the # explicit argument else: msg = _('ignored explicit argument %r') raise ArgumentError(action, msg % explicit_arg) # if there is no explicit argument, try to match the # optional's string arguments with the following strings # if successful, exit the loop else: start = start_index + 1 selected_patterns = arg_strings_pattern[start:] self.active_actions = [action] # Added by argcomplete _num_consumed_args[action] = 0 # Added by argcomplete arg_count = match_argument(action, selected_patterns) stop = start + arg_count args = arg_strings[start:stop] # Begin added by argcomplete # If the pattern is not open (e.g. no + at the end), remove the action from active actions (since # it wouldn't be able to consume any more args) _num_consumed_args[action] = len(args) if not action_is_open(action): self.active_actions.remove(action) # End added by argcomplete action_tuples.append((action, args, option_string)) break # add the Optional to the list and return the index at which # the Optional's string args stopped assert action_tuples for action, args, option_string in action_tuples: take_action(action, args, option_string) return stop # the list of Positionals left to be parsed; this is modified # by consume_positionals() positionals = self._get_positional_actions() # function to convert arg_strings into positional actions def consume_positionals(start_index): # match as many Positionals as possible match_partial = self._match_arguments_partial selected_pattern = arg_strings_pattern[start_index:] arg_counts = match_partial(positionals, selected_pattern) # slice off the appropriate arg strings for each Positional # and add the Positional and its args to the list for action, arg_count in zip(positionals, arg_counts): # Added by argcomplete self.active_actions.append(action) # Added by argcomplete for action, arg_count in zip(positionals, arg_counts): args = arg_strings[start_index: start_index + arg_count] start_index += arg_count _num_consumed_args[action] = len(args) # Added by argcomplete take_action(action, args) # slice off the Positionals that we just parsed and return the # index at which the Positionals' string args stopped positionals[:] = positionals[len(arg_counts):] return start_index # consume Positionals and Optionals alternately, until we have # passed the last option string extras = [] start_index = 0 if option_string_indices: max_option_string_index = max(option_string_indices) else: max_option_string_index = -1 while start_index <= max_option_string_index: # consume any Positionals preceding the next option next_option_string_index = min([ index for index in option_string_indices if index >= start_index]) if start_index != next_option_string_index: positionals_end_index = consume_positionals(start_index) # only try to parse the next optional if we didn't consume # the option string during the positionals parsing if positionals_end_index > start_index: start_index = positionals_end_index continue else: start_index = positionals_end_index # if we consumed all the positionals we could and we're not # at the index of an option string, there were extra arguments if start_index not in option_string_indices: strings = arg_strings[start_index:next_option_string_index] extras.extend(strings) start_index = next_option_string_index # consume the next optional and any arguments for it start_index = consume_optional(start_index) # consume any positionals following the last Optional stop_index = consume_positionals(start_index) # if we didn't consume all the argument strings, there were extras extras.extend(arg_strings[stop_index:]) # if we didn't use all the Positional objects, there were too few # arg strings supplied. if positionals: self.active_actions.append(positionals[0]) # Added by argcomplete self.error(_('too few arguments')) # make sure all required actions were present for action in self._actions: if action.required: if action not in seen_actions: name = _get_action_name(action) self.error(_('argument %s is required') % name) # make sure all required groups had one option present for group in self._mutually_exclusive_groups: if group.required: for action in group._group_actions: if action in seen_non_default_actions: break # if no actions were used, report the error else: names = [_get_action_name(action) for action in group._group_actions if action.help is not SUPPRESS] msg = _('one of the arguments %s is required') self.error(msg % ' '.join(names)) # return the updated namespace and the extra arguments return namespace, extras