class CssSubscriber in Advanced CSS/JS Aggregation 8.4

Subscribe to CSs asset optimization events and count selectors.

Hierarchy

• class \Drupal\advagg_old_ie_compatibility\EventSubscriber\CssSubscriber implements \Symfony\Component\EventDispatcher\EventSubscriberInterface

1 string reference to 'CssSubscriber'

advagg_old_ie_compatibility.services.yml in advagg_old_ie_compatibility/advagg_old_ie_compatibility.services.yml

advagg_old_ie_compatibility/advagg_old_ie_compatibility.services.yml

1 service uses CssSubscriber

advagg_old_ie_compatibility.css_subscriber in advagg_old_ie_compatibility/advagg_old_ie_compatibility.services.yml

Drupal\advagg_old_ie_compatibility\EventSubscriber\CssSubscriber

File

advagg_old_ie_compatibility/src/EventSubscriber/CssSubscriber.php, line 11

Namespace

Drupal\advagg_old_ie_compatibility\EventSubscriber

class CssSubscriber implements EventSubscriberInterface {

  /**
   * Scan the asset, count the selectors and save selector count to asset array.
   *
   * The counting method is very rough and may have inaccuracies - especially if
   * there are media queries in the file. Since we only care about the maximum,
   * this is acceptable since that reduces performance hit and an exact number
   * is unimportant.
   *
   * @param \Drupal\advagg\Asset\AssetOptimizationEvent $asset
   *   The asset optimization event.
   */
  public function scan(AssetOptimizationEvent $asset) {
    $asset_array = $asset
      ->getAsset();
    $asset_array['selectors'] = substr_count($asset
      ->getContent(), '{');
    $asset
      ->setAsset($asset_array);
  }

  /**
   * {@inheritdoc}
   */
  public static function getSubscribedEvents() {
    return [
      AssetOptimizationEvent::CSS => [
        'scan',
        100,
      ],
    ];
  }

}

Members

Name	Modifiers	Type	Description	Overrides
CssSubscriber::getSubscribedEvents	public static	function	Returns an array of event names this subscriber wants to listen to.
CssSubscriber::scan	public	function	Scan the asset, count the selectors and save selector count to asset array.