import shlex


class InterpreterError(Exception):
    pass


class Interpreter:
    """Interpreter for scritcher instructions/statements."""
    def __init__(self):
        pass

    def _cmd_noop(self):
        pass

    def run(self, line: str):
        """Run a single line."""
        print(f'running {line!r}')

        args = shlex.split(line)
        command = args[0]

        try:
            method = getattr(self, f'_cmd_{command}')
        except AttributeError:
            raise InterpreterError(f'Command {command!r} not found')

        method(*args[1:])