code: def validate(cls, full_config: typing.Dict[str, typing.Any]) -> typing.Optional[typing.Dict[str, typing.Any]]:
          
          pass
docs: Validate and parse config.
  
          This method will be called by the filters factory when you bind this filter.
          Must be overridden.
  
          :param full_config: dict with arguments passed to handler registrar
          :return: Current filter config