Same name in this branch
  1. 8.x-4.x advagg_bundler/src/Asset/AdvaggCssCollectionGrouper.php \Drupal\advagg_bundler\Asset\AdvaggCssCollectionGrouper::group()
Same name in other branches
  1. 5.0.x advagg_old_ie_compatibility/src/Asset/AdvaggCssCollectionGrouper.php \Drupal\advagg_old_ie_compatibility\Asset\AdvaggCssCollectionGrouper::group()
  2. 5.0.x advagg_bundler/src/Asset/AdvaggCssCollectionGrouper.php \Drupal\advagg_bundler\Asset\AdvaggCssCollectionGrouper::group()
  3. 6.0.x advagg_bundler/src/Asset/AdvaggCssCollectionGrouper.php \Drupal\advagg_bundler\Asset\AdvaggCssCollectionGrouper::group()
  4. 8.x-3.x advagg_old_ie_compatibility/src/Asset/AdvaggCssCollectionGrouper.php \Drupal\advagg_old_ie_compatibility\Asset\AdvaggCssCollectionGrouper::group()
  5. 8.x-3.x advagg_bundler/src/Asset/AdvaggCssCollectionGrouper.php \Drupal\advagg_bundler\Asset\AdvaggCssCollectionGrouper::group()

If enabled ensures that agreggates have a configurable maximum number of selectors. By default 4095 to work with the limits of older IE versions.

File

advagg_old_ie_compatibility/src/Asset/AdvaggCssCollectionGrouper.php, line 37

Class

AdvaggCssCollectionGrouper
Groups CSS assets.

Namespace

Drupal\advagg_old_ie_compatibility\Asset

Code

public function group(array $css_assets) {
    if (!$this->config
        ->get('active')) {
        return parent::group($css_assets);
    }
    $limit = $this->config
        ->get('limit');
    $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;
    $selectors = 0;
    foreach ($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) {
            $selectors = 0;
            $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 ? $group_keys : NULL;
        }
        if (isset($item['selectors'])) {
            $selectors += $item['selectors'];
            if ($selectors > $limit) {
                $selectors = $item['selectors'];
                $i++;
                $groups[$i] = $item;
                unset($groups[$i]['data'], $groups[$i]['weight'], $groups[$i]['basename']);
                $groups[$i]['items'] = [];
            }
        }
        // Add the item to the current group.
        $groups[$i]['items'][] = $item;
    }
    return $groups;
}