@Override
  public @NotNull CharSequence getChars() {
    TreeElement firstChildNode = getFirstChildNode();
    if (firstChildNode == null) {
      return "";
    }
    else if (firstChildNode == getLastChildNode()) {
      return firstChildNode.getChars();
    }
    return getText();
  }
@Override
  public @NotNull CharSequence getChars()