code: def _ParseFilterOptions(self, options):
      
      self._event_filter_expression = self.ParseStringOption(options, 'filter')
      if self._event_filter_expression:
        self._event_filter = event_filter.EventObjectFilter()
  
        try:
          self._event_filter.CompileFilter(self._event_filter_expression)
        except errors.ParseError as exception:
          raise errors.BadConfigOption((
              'Unable to compile filter expression with error: '
              '{0!s}').format(exception))
  
      time_slice_event_time_string = getattr(options, 'slice', None)
      time_slice_duration = getattr(options, 'slice_size', 5)
      self._use_time_slicer = getattr(options, 'slicer', False)
  
      # The slice and slicer cannot be set at the same time.
      if time_slice_event_time_string and self._use_time_slicer:
        raise errors.BadConfigOption(
            'Time slice and slicer cannot be used at the same time.')
  
      time_slice_event_timestamp = None
      if time_slice_event_time_string:
        # Note self._preferred_time_zone is None when not set but represents UTC.
        preferred_time_zone = self._preferred_time_zone or 'UTC'
        timezone = pytz.timezone(preferred_time_zone)
        time_slice_event_timestamp = timelib.Timestamp.FromTimeString(
            time_slice_event_time_string, timezone=timezone)
        if time_slice_event_timestamp is None:
          raise errors.BadConfigOption(
              'Unsupported time slice event date and time: {0:s}'.format(
                  time_slice_event_time_string))
  
      if time_slice_event_timestamp is not None or self._use_time_slicer:
        # Note that time slicer uses the time slice to determine the duration.
        self._time_slice = time_slices.TimeSlice(
            time_slice_event_timestamp, duration=time_slice_duration)
docs: Parses the filter options.
  
      Args:
        options (argparse.Namespace): command line arguments.
  
      Raises:
        BadConfigOption: if the options are invalid.