class AdvaggCssCollectionGrouper in Advanced CSS/JS Aggregation 8.3

Groups CSS assets.

Hierarchy

• class \Drupal\Core\Asset\CssCollectionGrouper implements AssetCollectionGrouperInterface
  • class \Drupal\advagg_bundler\Asset\AdvaggCssCollectionGrouper implements AssetCollectionGrouperInterface

1 string reference to 'AdvaggCssCollectionGrouper'

advagg_bundler.services.yml in advagg_bundler/advagg_bundler.services.yml

advagg_bundler/advagg_bundler.services.yml

1 service uses AdvaggCssCollectionGrouper

asset.css.collection_grouper in advagg_bundler/advagg_bundler.services.yml

Drupal\advagg_bundler\Asset\AdvaggCssCollectionGrouper

File

advagg_bundler/src/Asset/AdvaggCssCollectionGrouper.php, line 12

Namespace

Drupal\advagg_bundler\Asset

class AdvaggCssCollectionGrouper extends CssCollectionGrouper implements AssetCollectionGrouperInterface {

  /**
   * Construct the grouper instance.
   *
   * @param \Drupal\Core\Config\ConfigFactoryInterface $config_factory
   *   A config factory for retrieving required config objects.
   */
  public function __construct(ConfigFactoryInterface $config_factory) {
    $this->config = $config_factory
      ->get('advagg_bundler.settings');
  }

  /**
   * {@inheritdoc}
   */
  public function group(array $css_assets) {
    $max = $this->config
      ->get('css.max');

    // Only modify core grouping if bundler is enabled.
    if (!$this->config
      ->get('active') || !$max) {
      return parent::group($css_assets);
    }
    $logic = $this->config
      ->get('css.logic');
    $preprocess_count = count(array_filter(array_column($css_assets, 'preprocess')));
    $target = max($max - (count($css_assets) - $preprocess_count), 1);
    if ($logic === 0) {
      $split = round($preprocess_count / $target);
    }
    else {
      $split = array_sum(array_column($css_assets, 'size')) / $target;
    }
    $current_size = 0;
    $groups = [];

    // If a group can contain multiple items, we track the information that must
    // be the same for each item in the group, so that when we iterate the next
    // item, we can determine if it can be put into the current group, or if a
    // new group needs to be made for it.
    $current_group_keys = NULL;

    // When creating a new group, we pre-increment $i, so by initializing it to
    // -1, the first group will have index 0.
    $i = -1;
    foreach ($css_assets as $item) {

      // The browsers for which the CSS item needs to be loaded is part of the
      // information that determines when a new group is needed, but the order
      // of keys in the array doesn't matter, and we don't want a new group if
      // all that's different is that order.
      ksort($item['browsers']);

      // If the item can be grouped with other items, set $group_keys to an
      // array of information that must be the same for all items in its group.
      // If the item can't be grouped with other items, set $group_keys to
      // FALSE. We put items into a group that can be aggregated together:
      // whether they will be aggregated is up to the _drupal_css_aggregate()
      // function or an
      // override of that function specified in hook_css_alter(), but regardless
      // of the details of that function, a group represents items that can be
      // aggregated. Since a group may be rendered with a single HTML tag, all
      // items in the group must share the same information that would need to
      // be part of that HTML tag.
      switch ($item['type']) {
        case 'file':

          // Group file items if their 'preprocess' flag is TRUE.
          // Help ensure maximum reuse of aggregate files by only grouping
          // together items that share the same 'group' value.
          $group_keys = $item['preprocess'] ? [
            $item['type'],
            $item['group'],
            $item['media'],
            $item['browsers'],
          ] : FALSE;
          break;
        case 'external':

          // Do not group external items.
          $group_keys = FALSE;
          break;
      }

      // If the group keys don't match the most recent group we're working with,
      // then a new group must be made.
      if ($group_keys !== $current_group_keys) {
        $i++;

        // Initialize the new group with the same properties as the first item
        // being placed into it. The item's 'data', 'weight' and 'basename'
        // properties are unique to the item and should not be carried over to
        // the group.
        $groups[$i] = $item;
        unset($groups[$i]['data'], $groups[$i]['weight'], $groups[$i]['basename']);
        $groups[$i]['items'] = [];
        $current_group_keys = $group_keys ? $group_keys : NULL;
      }

      // Add the item to the current group.
      $groups[$i]['items'][] = $item;
      if ($current_group_keys) {
        if ($logic === 0) {
          if (count($groups[$i]['items']) >= $split) {
            $current_group_keys = NULL;
          }
        }
        else {
          $current_size += isset($item['size']) ? $item['size'] : 0;
          if ($current_size >= $split) {
            $current_size = 0;
            $current_group_keys = NULL;
          }
        }
      }
      else {
        $current_size = 0;
      }
    }
    return $groups;
  }

}

Members

Name	Modifiers	Type	Description	Overrides
AdvaggCssCollectionGrouper::group	public	function	Puts multiple items into the same group if they are groupable and if they are for the same 'media' and 'browsers'. Items of the 'file' type are groupable if their 'preprocess' flag is TRUE, and items of the… Overrides CssCollectionGrouper::group
AdvaggCssCollectionGrouper::__construct	public	function	Construct the grouper instance.