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