Uninstalls a given list of themes.

Uninstalling a theme removes all related configuration (like blocks) and invokes the 'themes_uninstalled' hook.

Themes are allowed to be uninstalled even when their code has been removed from the filesystem, this is because themes do not allow uninstall hooks to be defined.

Parameters

array $theme_list: The themes to uninstall.

Overrides ThemeInstallerInterface::uninstall

File

core/lib/Drupal/Core/Extension/ThemeInstaller.php, line 193

Class

ThemeInstaller

Manages theme installation/uninstallation.

Namespace

Drupal\Core\Extension

Code

public function uninstall(array $theme_list) {
  $extension_config = $this->configFactory
    ->getEditable('core.extension');
  $theme_config = $this->configFactory
    ->getEditable('system.theme');
  $list = $this->themeHandler
    ->listInfo();
  $installed_themes = $extension_config->get('theme') ?: [];
  $theme_data = $this->themeExtensionList
    ->reset()
    ->getList();
  foreach ($theme_list as $key) {
    if ($extension_config->get("theme.{$key}") === NULL) {
      throw new UnknownExtensionException("Unknown theme: {$key}.");
    }
    if ($key === $theme_config->get('default')) {
      throw new \InvalidArgumentException("The current default theme {$key} cannot be uninstalled.");
    }
    if ($key === $theme_config->get('admin')) {
      throw new \InvalidArgumentException("The current administration theme {$key} cannot be uninstalled.");
    }
    // Base themes cannot be uninstalled if sub themes are installed, and if
    // they are not uninstalled at the same time.
    if (isset($list[$key]) && !empty($list[$key]->sub_themes)) {
      foreach ($list[$key]->sub_themes as $sub_key => $sub_label) {
        if (isset($list[$sub_key]) && !in_array($sub_key, $theme_list, TRUE)) {
          throw new \InvalidArgumentException("The base theme {$key} cannot be uninstalled, because theme {$sub_key} depends on it.");
        }
      }
    }
  }
  $this->cssCollectionOptimizer
    ->deleteAll();
  foreach ($theme_list as $key) {
    // The value is not used; the weight is ignored for themes currently.
    $extension_config->clear("theme.{$key}");
    // Remove all configuration belonging to the theme.
    $this->configManager
      ->uninstall('theme', $key);
  }
  // Don't check schema when uninstalling a theme since we are only clearing
  // keys.
  $extension_config->save(TRUE);
  // Refresh theme info.
  $this->themeHandler
    ->reset();
  // Remove themes that were uninstalled from the list.
  $register_themes = array_diff(array_keys($installed_themes), $theme_list);
  // Get list of extensions for the new list of themes.
  $register_themes = array_intersect_key($theme_data, array_flip($register_themes));
  $this->resetSystem($register_themes);
  $this->moduleHandler
    ->invokeAll('themes_uninstalled', [
    $theme_list,
  ]);
}

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