private static @Nullable String getParentTag(ZenCodingNode node) {
    if (node instanceof TemplateNode) {
      return ((TemplateNode)node).getTemplateToken().getKey();
    }
    else if (node instanceof MulOperationNode) {
      ZenCodingNode leftOperand = ((MulOperationNode)node).getLeftOperand();
      if (leftOperand instanceof TemplateNode) {
        return ((TemplateNode)leftOperand).getTemplateToken().getKey();
      }
    }
    return null;
  }
private static @Nullable String getParentTag(ZenCodingNode node)