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<?php
namespace Drupal\Core\Asset;
use Drupal\Core\Cache\CacheCollectorInterface;
/**
* Discovers available asset libraries in Drupal.
*/
class LibraryDiscovery implements LibraryDiscoveryInterface {
/**
* The library discovery cache collector.
*
* @var \Drupal\Core\Cache\CacheCollectorInterface
*/
protected $collector;
/**
* The final library definitions, statically cached.
*
* hook_library_info_alter() and hook_js_settings_alter() allows modules
* and themes to dynamically alter a library definition (once per request).
*
* @var array
*/
protected $libraryDefinitions = [];
/**
* Constructs a new LibraryDiscovery instance.
*
* @param \Drupal\Core\Cache\CacheCollectorInterface $library_discovery_collector
* The library discovery cache collector.
*/
public function __construct(CacheCollectorInterface $library_discovery_collector) {
$this->collector = $library_discovery_collector;
}
/**
* {@inheritdoc}
*/
public function getLibrariesByExtension($extension) {
if (!isset($this->libraryDefinitions[$extension])) {
$libraries = $this->collector->get($extension);
$this->libraryDefinitions[$extension] = [];
foreach ($libraries as $name => $definition) {
$this->libraryDefinitions[$extension][$name] = $definition;
}
}
return $this->libraryDefinitions[$extension];
}
/**
* {@inheritdoc}
*/
public function getLibraryByName($extension, $name) {
$extension = $this->getLibrariesByExtension($extension);
return isset($extension[$name]) ? $extension[$name] : FALSE;
}
/**
* {@inheritdoc}
*/
public function clearCachedDefinitions() {
$this->libraryDefinitions = [];
$this->collector->clear();
}
}