Chris@0: <?php
Chris@0: 
Chris@0: namespace Drupal\Core\Asset;
Chris@0: 
Chris@0: use Drupal\Component\Serialization\Json;
Chris@0: use Drupal\Core\State\StateInterface;
Chris@0: 
Chris@0: /**
Chris@0:  * Renders JavaScript assets.
Chris@0:  */
Chris@0: class JsCollectionRenderer implements AssetCollectionRendererInterface {
Chris@0: 
Chris@0:   /**
Chris@0:    * The state key/value store.
Chris@0:    *
Chris@0:    * @var \Drupal\Core\State\StateInterface
Chris@0:    */
Chris@0:   protected $state;
Chris@0: 
Chris@0:   /**
Chris@0:    * Constructs a JsCollectionRenderer.
Chris@0:    *
Chris@0:    * @param \Drupal\Core\State\StateInterface $state
Chris@0:    *   The state key/value store.
Chris@0:    */
Chris@0:   public function __construct(StateInterface $state) {
Chris@0:     $this->state = $state;
Chris@0:   }
Chris@0: 
Chris@0:   /**
Chris@0:    * {@inheritdoc}
Chris@0:    *
Chris@0:    * This class evaluates the aggregation enabled/disabled condition on a group
Chris@0:    * by group basis by testing whether an aggregate file has been made for the
Chris@0:    * group rather than by testing the site-wide aggregation setting. This allows
Chris@0:    * this class to work correctly even if modules have implemented custom
Chris@0:    * logic for grouping and aggregating files.
Chris@0:    */
Chris@0:   public function render(array $js_assets) {
Chris@0:     $elements = [];
Chris@0: 
Chris@0:     // A dummy query-string is added to filenames, to gain control over
Chris@0:     // browser-caching. The string changes on every update or full cache
Chris@0:     // flush, forcing browsers to load a new copy of the files, as the
Chris@0:     // URL changed. Files that should not be cached get REQUEST_TIME as
Chris@0:     // query-string instead, to enforce reload on every page request.
Chris@0:     $default_query_string = $this->state->get('system.css_js_query_string') ?: '0';
Chris@0: 
Chris@0:     // Defaults for each SCRIPT element.
Chris@0:     $element_defaults = [
Chris@0:       '#type' => 'html_tag',
Chris@0:       '#tag' => 'script',
Chris@0:       '#value' => '',
Chris@0:     ];
Chris@0: 
Chris@0:     // Loop through all JS assets.
Chris@0:     foreach ($js_assets as $js_asset) {
Chris@0:       // Element properties that do not depend on JS asset type.
Chris@0:       $element = $element_defaults;
Chris@0:       $element['#browsers'] = $js_asset['browsers'];
Chris@0: 
Chris@0:       // Element properties that depend on item type.
Chris@0:       switch ($js_asset['type']) {
Chris@0:         case 'setting':
Chris@0:           $element['#attributes'] = [
Chris@0:             // This type attribute prevents this from being parsed as an
Chris@0:             // inline script.
Chris@0:             'type' => 'application/json',
Chris@0:             'data-drupal-selector' => 'drupal-settings-json',
Chris@0:           ];
Chris@0:           $element['#value'] = Json::encode($js_asset['data']);
Chris@0:           break;
Chris@0: 
Chris@0:         case 'file':
Chris@0:           $query_string = $js_asset['version'] == -1 ? $default_query_string : 'v=' . $js_asset['version'];
Chris@0:           $query_string_separator = (strpos($js_asset['data'], '?') !== FALSE) ? '&' : '?';
Chris@0:           $element['#attributes']['src'] = file_url_transform_relative(file_create_url($js_asset['data']));
Chris@0:           // Only add the cache-busting query string if this isn't an aggregate
Chris@0:           // file.
Chris@0:           if (!isset($js_asset['preprocessed'])) {
Chris@0:             $element['#attributes']['src'] .= $query_string_separator . ($js_asset['cache'] ? $query_string : REQUEST_TIME);
Chris@0:           }
Chris@0:           break;
Chris@0: 
Chris@0:         case 'external':
Chris@0:           $element['#attributes']['src'] = $js_asset['data'];
Chris@0:           break;
Chris@0: 
Chris@0:         default:
Chris@0:           throw new \Exception('Invalid JS asset type.');
Chris@0:       }
Chris@0: 
Chris@0:       // Attributes may only be set if this script is output independently.
Chris@0:       if (!empty($element['#attributes']['src']) && !empty($js_asset['attributes'])) {
Chris@0:         $element['#attributes'] += $js_asset['attributes'];
Chris@0:       }
Chris@0: 
Chris@0:       $elements[] = $element;
Chris@0:     }
Chris@0: 
Chris@0:     return $elements;
Chris@0:   }
Chris@0: 
Chris@0: }