| protected extractRelationshipFromFragment ( array $fragment ) : array | ||
| $fragment | array | The selector fragment maybe ending with a direction relationship combinator. |
| return | array | The selector without the relationship fragment if any, the relationship fragment. |
protected function extractRelationshipFromFragment(array $fragment)
{
$parents = [];
$children = [];
$j = $i = count($fragment);
for (;;) {
$children = $j != $i ? array_slice($fragment, $j, $i - $j) : [];
$parents = array_slice($fragment, 0, $j);
$slice = end($parents);
if (empty($slice) || !$this->isImmediateRelationshipCombinator($slice[0])) {
break;
}
$j -= 2;
}
return [$parents, $children];
}