class_docstr: Facet Strip Labelling
  
  When called with strip_label_details knows how to
  alter the strip labels along either dimension.
  
  Parameters
  ----------
  rows : str | callable
      How to label the rows
  cols : str | callable
      How to label the columns
  multi_line : bool
      Whether to place each variable on a separate line
  default : str | callable
      Fallback labelling function. If it is a string, it should be
      one of `["label_value", "label_both", "label_context"]`{.py}.
  kwargs : dict
      {variable name : function | string} pairs for
      renaming variables. A function to rename the variable
      or a string name.
docstr: Called to do the labelling
docstr_tok: ["Called","to","do","the","labelling"]
code: def __call__(
      self, label_info: strip_label_details
  ) -> strip_label_details:
      """
      Called to do the labelling
      """
      variable_maps = {
          k: v
          for k, v in self.variable_maps.items()
          if k in label_info.variables
      }
  
      # No variable specific labeller
      if label_info.meta["dimension"] == "rows":
          result = self.rows_labeller(label_info)
      else:
          result = self.cols_labeller(label_info)
  
      # Make dict_labeler for the  variable specific labelers
      # do the label and merge
      if variable_maps:
          d = {
              value: variable_maps[var]
              for var, value in label_info.variables.items()
              if var in variable_maps
          }
          func = _as_strip_labelling_func(d)
          result2 = func(label_info)
          result.variables.update(result2.variables)
  
      if not self.multi_line:
          result = result.collapse()
  
      return result
  
imports: from __future__ import annotations
  import typing
  from abc import ABCMeta, abstractmethod
  from ..exceptions import PlotnineError
label_desc: Use image node_id 2 for calling the labeller obj's underlying member method code with example usage: obj.__call__(label_info) and returns: result