/**
* Extracts the path of the parent template file of the given template.
*
* Returns NULL in case the given template does not has a parent template.
*
* @param string $template The template to extract the parent template path from
* @return string|null
*/
private function extractParentTemplatePath($template)
{
// extract template tags from given template
$templateTags = $this->templateCompiler->extractTemplateTags($template);
// check whether at least one tag has been found
if (isset($templateTags[0])) {
// get first tag
$firstTemplateTag = new TemplateTag($templateTags[0]);
// return parent template path in case first tag is an extends-tag
if ($firstTemplateTag->getTagName() === 'extends') {
return $firstTemplateTag->getArgument(0);
}
}
// given template does not has a parent template
return null;
}
