/usr/share/php/Symfony/Component/CssSelector/Parser/Tokenizer/TokenizerEscaping.php is in php-symfony-css-selector 2.3.21+dfsg-4+deb8u3.
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/*
* 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\Tokenizer;
/**
* CSS selector tokenizer escaping applier.
*
* This component is a port of the Python cssselector library,
* which is copyright Ian Bicking, @see https://github.com/SimonSapin/cssselect.
*
* @author Jean-François Simon <jeanfrancois.simon@sensiolabs.com>
*/
class TokenizerEscaping
{
/**
* @var TokenizerPatterns
*/
private $patterns;
/**
* @param TokenizerPatterns $patterns
*/
public function __construct(TokenizerPatterns $patterns)
{
$this->patterns = $patterns;
}
/**
* @param string $value
*
* @return string
*/
public function escapeUnicode($value)
{
$value = $this->replaceUnicodeSequences($value);
return preg_replace($this->patterns->getSimpleEscapePattern(), '$1', $value);
}
/**
* @param string $value
*
* @return string
*/
public function escapeUnicodeAndNewLine($value)
{
$value = preg_replace($this->patterns->getNewLineEscapePattern(), '', $value);
return $this->escapeUnicode($value);
}
/**
* @param string $value
*
* @return string
*/
private function replaceUnicodeSequences($value)
{
return preg_replace_callback($this->patterns->getUnicodeEscapePattern(), function ($match) {
$c = hexdec($match[1]);
if (0x80 > $c %= 0x200000) {
return chr($c);
}
if (0x800 > $c) {
return chr(0xC0 | $c >> 6).chr(0x80 | $c & 0x3F);
}
if (0x10000 > $c) {
return chr(0xE0 | $c >> 12).chr(0x80 | $c >> 6 & 0x3F).chr(0x80 | $c & 0x3F);
}
}, $value);
}
}
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