/**
* Invokes the page attachment hooks.
*
* @param array &$page
* A #type 'page' render array, for which the page attachment hooks will be
* invoked and to which the results will be added.
*
* @throws \LogicException
*
* @internal
*
* @see hook_page_attachments()
* @see hook_page_attachments_alter()
*/
public function invokePageAttachmentHooks(array &$page)
{
// Modules can add attachments.
$attachments = [];
foreach ($this->moduleHandler->getImplementations('page_attachments') as $module) {
$function = $module . '_page_attachments';
$function($attachments);
}
if (array_diff(array_keys($attachments), ['#attached', '#cache']) !== []) {
throw new \LogicException('Only #attached and #cache may be set in hook_page_attachments().');
}
// Modules and themes can alter page attachments.
$this->moduleHandler->alter('page_attachments', $attachments);
\Drupal::theme()->alter('page_attachments', $attachments);
if (array_diff(array_keys($attachments), ['#attached', '#cache']) !== []) {
throw new \LogicException('Only #attached and #cache may be set in hook_page_attachments_alter().');
}
// Merge the attachments onto the $page render array.
$page = $this->renderer->mergeBubbleableMetadata($page, $attachments);
}
