diff core/lib/Drupal/Core/Asset/LibraryDiscovery.php @ 0:4c8ae668cc8c

Initial import (non-working)

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/core/lib/Drupal/Core/Asset/LibraryDiscovery.php	Wed Nov 29 16:09:58 2017 +0000
@@ -0,0 +1,70 @@
+<?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();
+  }
+
+}