JsCollectionGrouper::group

public JsCollectionGrouper::group(array $js_assets)

public function group(array $js_assets) {
  $groups = array();
  // 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;
  $index = -1;
  foreach ($js_assets as $item) {
    // The browsers for which the JavaScript item needs to be loaded is part
    // of the information that determines when a new group is needed, but the
    // order of keys in the array doesn't matter, and we don't want a new
    // group if all that's different is that order.
    ksort($item['browsers']);

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

    // Add the item to the current group.
    $groups[$index]['items'][] = $item;
  }

  return $groups;
}