page_theme.php
/**     * Parses the style declaration found in the stylesheet to return the type of editable style
    */
   private function getEditableStyleType($value) {
      // thx yamanoi
      if (preg_match('/^\s*font\s*:/',$value)) {
         return PageThemeEditableStyle::TSTYPE_FONT;
      }
      if (preg_match('/^\s*([a-z]+-)*color\s*:/',$value)) {
         return PageThemeEditableStyle::TSTYPE_COLOR;
      }
      return PageThemeEditableStyle::TSTYPE_CUSTOM;
   }