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<?php
/*
* This file is part of the Symfony package.
*
* (c) Fabien Potencier <[email protected]>
*
* 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 <[email protected]>
*
* @internal
*/
class Reader
{
private $source;
private $length;
private $position = 0;
public function __construct(string $source)
{
$this->source = $source;
$this->length = \strlen($source);
}
public function isEOF(): bool
{
return $this->position >= $this->length;
}
public function getPosition(): int
{
return $this->position;
}
public function getRemainingLength(): int
{
return $this->length - $this->position;
}
public function getSubstring(int $length, int $offset = 0): string
{
return substr($this->source, $this->position + $offset, $length);
}
public function getOffset(string $string)
{
$position = strpos($this->source, $string, $this->position);
return false === $position ? false : $position - $this->position;
}
/**
* @return array|false
*/
public function findPattern(string $pattern)
{
$source = substr($this->source, $this->position);
if (preg_match($pattern, $source, $matches)) {
return $matches;
}
return false;
}
public function moveForward(int $length)
{
$this->position += $length;
}
public function moveToEnd()
{
$this->position = $this->length;
}
}
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