static function singletonFromWikiPage($wikiPage)
 {
     if (self::$instance == null) {
         self::$instance = new WikihowArticleEditor();
         self::$instance->mWikiPage = $wikiPage;
         self::$instance->mTitleObj = $wikiPage->getTitle();
         self::$instance->mTitle = $wikiPage->getTitle()->getText();
         $text = ContentHandler::getContentText($wikiPage->getContent(Revision::RAW));
         self::$instance->loadFromText($text);
     }
     return self::$instance;
 }