Class ArgTableArgParser

awscli/argparser.py:178–213

CLI arg parser based on an argument table.

class ArgTableArgParser(CLIArgParser):
    """CLI arg parser based on an argument table."""

    def __init__(self, argument_table, command_table=None):
        # command_table is an optional subcommand_table.  If it's passed
        # in, then we'll update the argparse to parse a 'subcommand' argument
        # and populate the choices field with the command table keys.
        super().__init__(
            formatter_class=self.Formatter,
            add_help=False,
            usage=USAGE,
            conflict_handler='resolve',
        )
        if command_table is None:
            command_table = {}
        self._build(argument_table, command_table)

    def _build(self, argument_table, command_table):
        for arg_name in argument_table:
            argument = argument_table[arg_name]
            argument.add_to_parser(self)
        if command_table:
            self.add_argument(
                'subcommand',
                action=CommandAction,
                command_table=command_table,
                nargs='?',
            )

    def parse_known_args(self, args, namespace=None):
        if len(args) == 1 and args[0] == 'help':
            namespace = argparse.Namespace()
            namespace.help = 'help'
            return namespace, []
        else:
            return super().parse_known_args(args, namespace)


class SubCommandArgParser(ArgTableArgParser):