/**
* Render the template.
*
* @param string $template The template string
* @param LayoutInterface|MailInterface $templateInstance The template instance
* @param array $variables The variables of template
*
* @return string The rendered template
*
* @throws \Exception
*/
protected function renderTemplate($template, $templateInstance, array $variables = array())
{
if (null !== $template) {
if ($templateInstance instanceof TwigTemplateInterface) {
$tpl = $this->renderer->loadTemplate($templateInstance->getFile());
if ($tpl instanceof \Twig_Template) {
$template = $tpl->renderBlock($template, $variables);
$template = '' === $template ? null : $template;
}
} else {
$tpl = $this->renderer->createTemplate($template);
$template = $tpl->render($variables);
}
}
return $template;
}
