<?php

class HTMLBuilder
{
   private $buffer;
   private $html;
   private $body;

   public function __construct () {
      $this->buffer = new DOMDocument('1.0', 'utf-8');
      $this->buffer->appendChild( new DOMElement('html') );
   }

   public function makeTitle ($title) {
      $html = $this->getUniqueNodeByTagName('html');
      $head = $html->appendChild( new DOMElement('head') );
      $titleNode = $head->appendChild( new DOMElement('title', $title) );
   }

   public function makeString ($string) {
      $body = $this->getBody();
      $body->appendChild( new DOMElement('p', $string) );
   }

   public function makeItems ($items) {
      $body = $this->getBody();

      $ul = $body->appendChild( new DOMElement('ul') );
      foreach($items as $item) {
         $ul->appendChild( new DOMElement('li', $item) );
      }
   }

   public function close () {
      // doing nothing.
   }

   public function getResult () {
      return $this->buffer->saveXML();
   }

   private function &getUniqueNodeByTagName ($tagName, $index = 0 ) {
      $tmp = $this->buffer->getElementsByTagName($tagName);
      return $tmp->item($index);
   }

   private function &getBody () {
      $tmp = $this->buffer->getElementsByTagName('body');

      if ( $tmp->length ) {
         return $tmp->item(0);
      } else {
         $html = $this->getUniqueNodeByTagName('html');
         $html->appendChild(new DOMElement('body'));
         return $this->getUniqueNodeByTagName('body');
      }
   }

}