code: protected void parseElse(final int length) {
  		Node parent = peek();
  		if (!(parent instanceof IfNode)) {
  			return;
  		}
  		IfNode ifNode = (IfNode) pop();
  		ElseNode elseNode = new ElseNode(Math.max(this.position - 2, 0), length);
  		this.position = this.tokenizer.getPosition();
  		ifNode.setElseNode(elseNode);
  		push(elseNode);
  		tokenizer.skipWhitespace();
  	}
docs: ELSE文解析
  
  @param length ELSE文の長さ