78 lines
1.6 KiB
PHP
78 lines
1.6 KiB
PHP
<?php
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namespace Symfony\Component\CssSelector;
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/*
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* This file is part of the Symfony package.
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*
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* (c) Fabien Potencier <fabien.potencier@symfony-project.com>
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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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/**
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* TokenStream represents a stream of CSS Selector tokens.
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*
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* This component is a port of the Python lxml library,
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* which is copyright Infrae and distributed under the BSD license.
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*
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* @author Fabien Potencier <fabien.potencier@symfony-project.com>
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*/
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class TokenStream
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{
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protected $used;
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protected $tokens;
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protected $source;
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protected $peeked;
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protected $peeking;
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public function __construct($tokens, $source = null)
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{
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$this->used = array();
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$this->tokens = $tokens;
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$this->source = $source;
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$this->peeked = null;
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$this->peeking = false;
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}
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public function getUsed()
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{
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return $this->used;
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}
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public function next()
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{
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if ($this->peeking) {
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$this->peeking = false;
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$this->used[] = $this->peeked;
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return $this->peeked;
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}
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if (!count($this->tokens)) {
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return null;
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}
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$next = array_shift($this->tokens);
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$this->used[] = $next;
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return $next;
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}
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public function peek()
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{
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if (!$this->peeking) {
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if (!count($this->tokens)) {
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return null;
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}
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$this->peeked = array_shift($this->tokens);
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$this->peeking = true;
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}
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return $this->peeked;
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}
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}
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