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<?php /* * This file is part of Composer. * * (c) Nils Adermann <[email protected]> * Jordi Boggiano <[email protected]> * * For the full copyright and license information, please view the LICENSE * file that was distributed with this source code. */ namespace Composer\DependencyResolver; /** * An extension of SplDoublyLinkedList with seek and removal of current element * * SplDoublyLinkedList only allows deleting a particular offset and has no * method to set the internal iterator to a particular offset. * * @author Nils Adermann <[email protected]> */ class RuleWatchChain extends \SplDoublyLinkedList { protected $offset = 0; /** * Moves the internal iterator to the specified offset * * @param int $offset The offset to seek to. */ public function seek($offset) { $this->rewind(); for ($i = 0; $i < $offset; $i++, $this->next()); } /** * Removes the current element from the list * * As SplDoublyLinkedList only allows deleting a particular offset and * incorrectly sets the internal iterator if you delete the current value * this method sets the internal iterator back to the following element * using the seek method. */ public function remove() { $offset = $this->key(); $this->offsetUnset($offset); $this->seek($offset); } }