/**
* Sets the renderer for markdown fields to use
* @param {string} $renderer Class Name of an implementation of IMarkdownRenderer
*/
public static function setRenderer($renderer)
{
if (ClassInfo::classImplements($renderer, 'IMarkdownRenderer')) {
self::$renderer = $renderer;
} else {
user_error('The renderer ' . $renderer . ' does not implement IMarkdownRenderer', E_USER_ERROR);
}
}