function DrupalKernel::updateThemes

Updates the kernel's list of themes to the new list.

The kernel needs to update its list and container to match the new list.

array<string, \Drupal\Core\Extension\Extension> $register_themes List of theme extensions, keyed by theme name.

Overrides DrupalKernelInterface::updateThemes

File

core/lib/Drupal/Core/DrupalKernel.php, line 900

Class

DrupalKernel

The DrupalKernel class is the core of Drupal itself.

Namespace

Code

public function updateThemes(array $register_themes = []) : void {
  $pre_existing_theme_namespaces = [];
  if ($this->booted && isset($this->themeList)) {
    $pre_existing_theme_namespaces = $this->getExtensionNamespacesPsr4($this->getExtensionFileNames($this->themeList, [
      $this,
      'themeExtensions',
    ]));
  }
  $this->themeList = $register_themes;
  foreach ($register_themes as $name => $extension) {
    $this->themeExtensions[$name] = $extension;
  }
  // If we haven't yet booted, we don't need to do anything: the new theme
  // list will take effect when boot() is called. However we set a
  // flag that the container needs a rebuild, so that a potentially cached
  // container is not used. If we have already booted, then rebuild the
  // container in order to refresh the serviceProvider list and container.
  $this->containerNeedsRebuild = TRUE;
  if ($this->booted) {
    // We need to register any new namespaces to a new class loader because
    // the current class loader might have stored a negative result for a
    // class that is now available.
    // @see \Composer\Autoload\ClassLoader::findFile()
    $new_namespaces = array_diff_key($this->getExtensionNamespacesPsr4($this->getExtensionFileNames($this->themeList, [
      $this,
      'themeExtensions',
    ])), $pre_existing_theme_namespaces);
    if (!empty($new_namespaces)) {
      $additional_class_loader = new ClassLoader();
      $this->classLoaderAddMultiplePsr4($new_namespaces, $additional_class_loader);
      $additional_class_loader->register();
    }
    $this->initializeContainer();
  }
}