/**
  * Sets the meta description in the database to be part of the intro, part
  * of the first step, or 'original' which is something like "wikiHow
  * article on How to <title>".
  */
 private function buildDescription($style)
 {
     if (self::DESC_STYLE_ORIGINAL == $style) {
         return array(true, '');
     }
     if (self::DESC_STYLE_EDITED == $style) {
         return array(true, $this->row['ami_desc']);
     }
     $wikitext = $this->getArticleWikiText();
     if (!$wikitext) {
         return array(false, '');
     }
     if (self::DESC_STYLE_INTRO == $style || self::DESC_STYLE_INTRO_NO_TITLE == $style) {
         // grab intro
         $desc = Wikitext::getIntro($wikitext);
         // append first step to intro if intro maybe isn't long enough
         if (strlen($desc) < 2 * self::MAX_DESC_LENGTH) {
             list($steps, ) = Wikitext::getStepsSection($wikitext);
             if ($steps) {
                 $desc .= ' ' . Wikitext::cutFirstStep($steps);
             }
         }
     } elseif (self::DESC_STYLE_STEP1 == $style) {
         // grab steps section
         list($desc, ) = Wikitext::getStepsSection($wikitext);
         // pull out just the first step
         if ($desc) {
             $desc = Wikitext::cutFirstStep($desc);
         } else {
             $desc = Wikitext::getIntro($wikitext);
         }
     } else {
         //throw new Exception('ArticleMetaInfo: unknown style');
         return array(false, '');
     }
     $desc = Wikitext::flatten($desc);
     $howto = wfMsg('howto', $this->titleText);
     if ($desc) {
         if (self::DESC_STYLE_INTRO_NO_TITLE != $style) {
             $desc = $howto . '. ' . $desc;
         }
     } else {
         $desc = $howto;
     }
     $desc = self::trimDescription($desc);
     return array(true, $desc);
 }