def VerifyStructure(self, parser_mediator, lines):
    """Verifies that this is a bash history file.

    Args:
      parser_mediator (ParserMediator): mediates interactions between
          parsers and other components, such as storage and dfvfs.
      lines (str): one or more lines from the text file.

    Returns:
      bool: True if this is the correct parser, False otherwise.
    """
    match_generator = self._VERIFICATION_GRAMMAR.scanString(lines, maxMatches=1)
    return bool(list(match_generator))