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55 lines
1.5 KiB
PHP
55 lines
1.5 KiB
PHP
<?php declare(strict_types=1);
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/*
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* This file is part of Composer.
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*
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* (c) Nils Adermann <naderman@naderman.de>
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* Jordi Boggiano <j.boggiano@seld.be>
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*
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* For the full copyright and license information, please view the LICENSE
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* file that was distributed with this source code.
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*/
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namespace Composer\DependencyResolver;
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/**
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* An extension of SplDoublyLinkedList with seek and removal of current element
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*
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* SplDoublyLinkedList only allows deleting a particular offset and has no
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* method to set the internal iterator to a particular offset.
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*
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* @author Nils Adermann <naderman@naderman.de>
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* @extends \SplDoublyLinkedList<RuleWatchNode>
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*/
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class RuleWatchChain extends \SplDoublyLinkedList
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{
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/**
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* Moves the internal iterator to the specified offset
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*
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* @param int $offset The offset to seek to.
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* @return void
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*/
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public function seek(int $offset): void
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{
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$this->rewind();
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for ($i = 0; $i < $offset; $i++, $this->next());
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}
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/**
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* Removes the current element from the list
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*
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* As SplDoublyLinkedList only allows deleting a particular offset and
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* incorrectly sets the internal iterator if you delete the current value
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* this method sets the internal iterator back to the following element
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* using the seek method.
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*
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* @return void
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*/
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public function remove(): void
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{
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$offset = $this->key();
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$this->offsetUnset($offset);
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$this->seek($offset);
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}
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}
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