Chris@0: <?php
Chris@0: 
Chris@0: namespace Drupal\Core\Asset;
Chris@0: 
Chris@0: use Drupal\Core\Cache\CacheCollectorInterface;
Chris@0: 
Chris@0: /**
Chris@0:  * Discovers available asset libraries in Drupal.
Chris@0:  */
Chris@0: class LibraryDiscovery implements LibraryDiscoveryInterface {
Chris@0: 
Chris@0:   /**
Chris@0:    * The library discovery cache collector.
Chris@0:    *
Chris@0:    * @var \Drupal\Core\Cache\CacheCollectorInterface
Chris@0:    */
Chris@0:   protected $collector;
Chris@0: 
Chris@0:   /**
Chris@0:    * The final library definitions, statically cached.
Chris@0:    *
Chris@17:    * Hooks hook_library_info_alter() and hook_js_settings_alter() allow modules
Chris@0:    * and themes to dynamically alter a library definition (once per request).
Chris@0:    *
Chris@0:    * @var array
Chris@0:    */
Chris@0:   protected $libraryDefinitions = [];
Chris@0: 
Chris@0:   /**
Chris@0:    * Constructs a new LibraryDiscovery instance.
Chris@0:    *
Chris@0:    * @param \Drupal\Core\Cache\CacheCollectorInterface $library_discovery_collector
Chris@0:    *   The library discovery cache collector.
Chris@0:    */
Chris@0:   public function __construct(CacheCollectorInterface $library_discovery_collector) {
Chris@0:     $this->collector = $library_discovery_collector;
Chris@0:   }
Chris@0: 
Chris@0:   /**
Chris@0:    * {@inheritdoc}
Chris@0:    */
Chris@0:   public function getLibrariesByExtension($extension) {
Chris@0:     if (!isset($this->libraryDefinitions[$extension])) {
Chris@0:       $libraries = $this->collector->get($extension);
Chris@0:       $this->libraryDefinitions[$extension] = [];
Chris@0:       foreach ($libraries as $name => $definition) {
Chris@0:         $this->libraryDefinitions[$extension][$name] = $definition;
Chris@0:       }
Chris@0:     }
Chris@0: 
Chris@0:     return $this->libraryDefinitions[$extension];
Chris@0:   }
Chris@0: 
Chris@0:   /**
Chris@0:    * {@inheritdoc}
Chris@0:    */
Chris@0:   public function getLibraryByName($extension, $name) {
Chris@0:     $extension = $this->getLibrariesByExtension($extension);
Chris@0:     return isset($extension[$name]) ? $extension[$name] : FALSE;
Chris@0:   }
Chris@0: 
Chris@0:   /**
Chris@0:    * {@inheritdoc}
Chris@0:    */
Chris@0:   public function clearCachedDefinitions() {
Chris@0:     $this->libraryDefinitions = [];
Chris@0:     $this->collector->clear();
Chris@0:   }
Chris@0: 
Chris@0: }