public static int calcLineCount(@NotNull CharSequence chars, final boolean skipLastEmptyLine) {
    int lineCount = 0;
    if (chars.length() != 0) {
      final LineTokenizer tokenizer = new LineTokenizer(chars);
      while (!tokenizer.atEnd()) {
        lineCount += 1;
        tokenizer.advance();
      }
      if (!skipLastEmptyLine && stringEndsWithSeparator(tokenizer)) {
        lineCount += 1;
      }
    }
    return lineCount;
  }
public static int calcLineCount(@NotNull CharSequence chars, final boolean skipLastEmptyLine)