/**
* Removes any empty group children from a tree structure, returning
* the number of non-group entries.
*
* @param MenuPresenceInterface $presence
* @return int the number of non-group children found on the levels below
*/
protected function filterNestedEmptyGroups(MenuPresenceInterface $presence)
{
if ($presence['type'] !== MenuPresenceType::GROUP) {
return 1;
}
if (!$presence['children'] || !count($presence['children'])) {
return 0;
}
$remove = [];
$children = $presence['children'];
$nonGroupCount = 0;
foreach ($children as $key => $childPresence) {
if (!$this->filterNestedEmptyGroups($childPresence)) {
$remove[] = $key;
continue;
}
$nonGroupCount++;
}
foreach ($remove as $key) {
unset($children[$key]);
}
$presence->setChildren($children);
return $nonGroupCount;
}
