public String rangeText(@NotNull PsiElement firstElement, @NotNull PsiElement lastElement) {
    checkState();
    PsiElement e;
    StringBuilder result = new StringBuilder();
    for (e = firstElement; e != null && e != lastElement; e = e.getNextSibling()) {
      addIgnored(e);
      result.append(e.getText());
    }
    if (e == null) {
      throw new IllegalArgumentException("Elements must be siblings: " + firstElement + " and " + lastElement);
    }
    addIgnored(lastElement);
    result.append(lastElement.getText());
    return result.toString();
  }
public String rangeText(@NotNull PsiElement firstElement, @NotNull PsiElement lastElement)