code: def VerifyStructure(self, parser_mediator, line):
      
      structure = self.LOG_LINE
  
      try:
        parsed_structure = structure.parseString(line)
      except pyparsing.ParseException:
        logger.debug('Not a XChat scrollback log file')
        return False
  
      try:
        int(parsed_structure.timestamp, 10)
      except ValueError:
        logger.debug('Not a XChat scrollback log file, invalid timestamp string')
        return False
  
      return True
docs: Verify that this file is a XChat scrollback log file.
  
      Args:
        parser_mediator (ParserMediator): mediates interactions between parsers
            and other components, such as storage and dfvfs.
        line (str): line from a text file.
  
      Returns:
        bool: True if the line was successfully parsed.