protected function pattern(Document $document, $pattern)
{
$content = $document->getContent();
if (preg_match($pattern, $content, $matches) === 1) {
// not really required when using html doc tags. But in case it's frontmatter, it should be removed
$content = preg_replace($pattern, '', $content);
$data = Yaml::parse($matches[1]);
if (is_array($data)) {
$attributes = array_replace_recursive($document->getAttributes(), $data);
$document->setAttributes($attributes);
}
}
$document->setContent($content);
return $this;
}
