def METHOD_NAME(cls):
    """ Class decorator to generate rules from parameterized rule templates.
    See `parameterized` for more information on parameterized rules.
    """
    issued_nodoc_warning = False
    for attr_name in dir(cls):
        if attr_name.startswith('p_'):
            method = getattr(cls, attr_name)
            if hasattr(method, '_params'):
                # Remove the template method
                delattr(cls, attr_name)
                # Create parameterized rules from this method; only run this if
                # the method has a docstring. This is to address an issue when
                # pycparser's users are installed in -OO mode which strips
                # docstrings away.
                # See: https://github.com/eliben/pycparser/pull/198/ and
                #      https://github.com/eliben/pycparser/issues/197
                # for discussion.
                if method.__doc__ is not None:
                    _create_param_rules(cls, method)
                elif not issued_nodoc_warning:
                    warnings.warn(
                        'parsing methods must have __doc__ for pycparser to work properly',
                        RuntimeWarning,
                        stacklevel=2)
                    issued_nodoc_warning = True
    return cls