code: def lex_document(self, document):
          
          location = self.editor_buffer.location
  
          if location:
              if self.editor_buffer.in_file_explorer_mode:
                  return PygmentsLexer(DirectoryListingLexer, sync_from_start=False).lex_document(document)
  
              return PygmentsLexer.from_filename(location, sync_from_start=False).lex_document(document)
  
          return SimpleLexer().lex_document(document)
docs: Call the lexer and return a get_tokens_for_line function.