Chris@0: <?php
Chris@0: 
Chris@0: /*
Chris@0:  * This file is part of the Symfony package.
Chris@0:  *
Chris@0:  * (c) Fabien Potencier <fabien@symfony.com>
Chris@0:  *
Chris@0:  * For the full copyright and license information, please view the LICENSE
Chris@0:  * file that was distributed with this source code.
Chris@0:  */
Chris@0: 
Chris@0: namespace Symfony\Component\CssSelector\Parser;
Chris@0: 
Chris@0: /**
Chris@0:  * CSS selector reader.
Chris@0:  *
Chris@0:  * This component is a port of the Python cssselect library,
Chris@0:  * which is copyright Ian Bicking, @see https://github.com/SimonSapin/cssselect.
Chris@0:  *
Chris@0:  * @author Jean-François Simon <jeanfrancois.simon@sensiolabs.com>
Chris@0:  *
Chris@0:  * @internal
Chris@0:  */
Chris@0: class Reader
Chris@0: {
Chris@0:     private $source;
Chris@0:     private $length;
Chris@0:     private $position = 0;
Chris@0: 
Chris@0:     /**
Chris@0:      * @param string $source
Chris@0:      */
Chris@0:     public function __construct($source)
Chris@0:     {
Chris@0:         $this->source = $source;
Chris@17:         $this->length = \strlen($source);
Chris@0:     }
Chris@0: 
Chris@0:     /**
Chris@0:      * @return bool
Chris@0:      */
Chris@0:     public function isEOF()
Chris@0:     {
Chris@0:         return $this->position >= $this->length;
Chris@0:     }
Chris@0: 
Chris@0:     /**
Chris@0:      * @return int
Chris@0:      */
Chris@0:     public function getPosition()
Chris@0:     {
Chris@0:         return $this->position;
Chris@0:     }
Chris@0: 
Chris@0:     /**
Chris@0:      * @return int
Chris@0:      */
Chris@0:     public function getRemainingLength()
Chris@0:     {
Chris@0:         return $this->length - $this->position;
Chris@0:     }
Chris@0: 
Chris@0:     /**
Chris@0:      * @param int $length
Chris@0:      * @param int $offset
Chris@0:      *
Chris@0:      * @return string
Chris@0:      */
Chris@0:     public function getSubstring($length, $offset = 0)
Chris@0:     {
Chris@0:         return substr($this->source, $this->position + $offset, $length);
Chris@0:     }
Chris@0: 
Chris@0:     /**
Chris@0:      * @param string $string
Chris@0:      *
Chris@0:      * @return int
Chris@0:      */
Chris@0:     public function getOffset($string)
Chris@0:     {
Chris@0:         $position = strpos($this->source, $string, $this->position);
Chris@0: 
Chris@0:         return false === $position ? false : $position - $this->position;
Chris@0:     }
Chris@0: 
Chris@0:     /**
Chris@0:      * @param string $pattern
Chris@0:      *
Chris@0:      * @return array|false
Chris@0:      */
Chris@0:     public function findPattern($pattern)
Chris@0:     {
Chris@0:         $source = substr($this->source, $this->position);
Chris@0: 
Chris@0:         if (preg_match($pattern, $source, $matches)) {
Chris@0:             return $matches;
Chris@0:         }
Chris@0: 
Chris@0:         return false;
Chris@0:     }
Chris@0: 
Chris@0:     /**
Chris@0:      * @param int $length
Chris@0:      */
Chris@0:     public function moveForward($length)
Chris@0:     {
Chris@0:         $this->position += $length;
Chris@0:     }
Chris@0: 
Chris@0:     public function moveToEnd()
Chris@0:     {
Chris@0:         $this->position = $this->length;
Chris@0:     }
Chris@0: }