function LibraryDependencyResolver::getMinimalRepresentativeSubset

File

core/lib/Drupal/Core/Asset/LibraryDependencyResolver.php, line 67

Class

LibraryDependencyResolver

Resolves the dependencies of asset (CSS/JavaScript) libraries.

Namespace

Code

public function getMinimalRepresentativeSubset(array $libraries) {
  assert(count($libraries) === count(array_unique($libraries)), '$libraries can\'t contain duplicate items.');
  $minimal = [];
  // Determine each library's dependencies.
  $with_deps = [];
  foreach ($libraries as $library) {
    $with_deps[$library] = $this->getLibrariesWithDependencies([
      $library,
    ]);
  }
  foreach ($libraries as $library) {
    $exists = FALSE;
    foreach ($with_deps as $other_library => $dependencies) {
      if ($library == $other_library) {
        continue;
      }
      if (in_array($library, $dependencies)) {
        $exists = TRUE;
        break;

      }
    }
    if (!$exists) {
      $minimal[] = $library;
    }
  }
  return $minimal;
}