class EditorManager

class EditorManager extends DefaultPluginManager {
    
    /**
     * Constructs an EditorManager object.
     *
     * @param \Traversable $namespaces
     *   An object that implements \Traversable which contains the root paths
     *   keyed by the corresponding namespace to look for plugin implementations.
     * @param \Drupal\Core\Cache\CacheBackendInterface $cache_backend
     *   Cache backend instance to use.
     * @param \Drupal\Core\Extension\ModuleHandlerInterface $module_handler
     *   The module handler to invoke the alter hook with.
     */
    public function __construct(\Traversable $namespaces, CacheBackendInterface $cache_backend, ModuleHandlerInterface $module_handler) {
        parent::__construct('Plugin/Editor', $namespaces, $module_handler, 'Drupal\\editor\\Plugin\\EditorPluginInterface', 'Drupal\\editor\\Annotation\\Editor');
        $this->alterInfo('editor_info');
        $this->setCacheBackend($cache_backend, 'editor_plugins');
    }
    
    /**
     * Populates a key-value pair of available text editors.
     *
     * @return array
     *   An array of translated text editor labels, keyed by ID.
     */
    public function listOptions() {
        $options = [];
        foreach ($this->getDefinitions() as $key => $definition) {
            $options[$key] = $definition['label'];
        }
        return $options;
    }
    
    /**
     * Retrieves text editor libraries and JavaScript settings.
     *
     * @param array $format_ids
     *   An array of format IDs as returned by array_keys(filter_formats()).
     *
     * @return array
     *   An array of attachments, for use with #attached.
     *
     * @see \Drupal\Core\Render\AttachmentsResponseProcessorInterface::processAttachments()
     */
    public function getAttachments(array $format_ids) {
        $attachments = [
            'library' => [],
        ];
        $settings = [];
        foreach ($format_ids as $format_id) {
            $editor = editor_load($format_id);
            if (!$editor) {
                continue;
            }
            $plugin = $this->createInstance($editor->getEditor());
            $plugin_definition = $plugin->getPluginDefinition();
            // Libraries.
            $attachments['library'] = array_merge($attachments['library'], $plugin->getLibraries($editor));
            // Format-specific JavaScript settings.
            $settings['editor']['formats'][$format_id] = [
                'format' => $format_id,
                'editor' => $editor->getEditor(),
                'editorSettings' => $plugin->getJSSettings($editor),
                'editorSupportsContentFiltering' => $plugin_definition['supports_content_filtering'],
                'isXssSafe' => $plugin_definition['is_xss_safe'],
            ];
        }
        // Allow other modules to alter all JavaScript settings.
        $this->moduleHandler
            ->alter('editor_js_settings', $settings);
        if (empty($attachments['library']) && empty($settings)) {
            return [];
        }
        $attachments['drupalSettings'] = $settings;
        return $attachments;
    }

}