3 namespace Drupal\Core\Asset;
6 * Resolves the dependencies of asset (CSS/JavaScript) libraries.
8 class LibraryDependencyResolver implements LibraryDependencyResolverInterface {
11 * The library discovery service.
13 * @var \Drupal\Core\Asset\LibraryDiscoveryInterface
15 protected $libraryDiscovery;
18 * Constructs a new LibraryDependencyResolver instance.
20 * @param \Drupal\Core\Asset\LibraryDiscoveryInterface $library_discovery
21 * The library discovery service.
23 public function __construct(LibraryDiscoveryInterface $library_discovery) {
24 $this->libraryDiscovery = $library_discovery;
30 public function getLibrariesWithDependencies(array $libraries) {
31 return $this->doGetDependencies($libraries);
35 * Gets the given libraries with its dependencies.
37 * Helper method for ::getLibrariesWithDependencies().
39 * @param string[] $libraries_with_unresolved_dependencies
40 * A list of libraries, with unresolved dependencies, in the order they
42 * @param string[] $final_libraries
43 * The final list of libraries (the return value) that is being built
47 * A list of libraries, in the order they should be loaded, including their
50 protected function doGetDependencies(array $libraries_with_unresolved_dependencies, array $final_libraries = []) {
51 foreach ($libraries_with_unresolved_dependencies as $library) {
52 if (!in_array($library, $final_libraries)) {
53 list($extension, $name) = explode('/', $library, 2);
54 $definition = $this->libraryDiscovery->getLibraryByName($extension, $name);
55 if (!empty($definition['dependencies'])) {
56 $final_libraries = $this->doGetDependencies($definition['dependencies'], $final_libraries);
58 $final_libraries[] = $library;
61 return $final_libraries;
67 public function getMinimalRepresentativeSubset(array $libraries) {
70 // Determine each library's dependencies.
72 foreach ($libraries as $library) {
73 $with_deps[$library] = $this->getLibrariesWithDependencies([$library]);
76 foreach ($libraries as $library) {
78 foreach ($with_deps as $other_library => $dependencies) {
79 if ($library == $other_library) {
82 if (in_array($library, $dependencies)) {
88 $minimal[] = $library;