code: protected void parseElse() {
          Node parent = peek();
          if (!(parent instanceof IfNode)) {
              return;
          }
          IfNode ifNode = (IfNode) pop();
          ElseNode elseNode = new ElseNode();
          ifNode.setElseNode(elseNode);
          push(elseNode);
          tokenizer.skipWhitespace();
      }
docs: Parse an ELSE node.