private static boolean isKeyword(IElementType tokenType) {
    return tokenType == CustomHighlighterTokenType.KEYWORD_1 ||
           tokenType == CustomHighlighterTokenType.KEYWORD_2 ||
           tokenType == CustomHighlighterTokenType.KEYWORD_3 ||
           tokenType == CustomHighlighterTokenType.KEYWORD_4;
  }
private static boolean isKeyword(IElementType tokenType)