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<?php
declare(strict_types=1);
/*
* This file is part of the league/commonmark package.
*
* (c) Colin O'Dell <colinodell@gmail.com>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace League\CommonMark\Util;
/**
* @psalm-immutable
*/
final class HtmlFilter
{
// Return the entire string as-is
public const ALLOW = 'allow';
// Escape the entire string so any HTML/JS won't be interpreted as such
public const ESCAPE = 'escape';
// Return an empty string
public const STRIP = 'strip';
/**
* Runs the given HTML through the given filter
*
* @param string $html HTML input to be filtered
* @param string $filter One of the HtmlFilter constants
*
* @return string Filtered HTML
*
* @throws \InvalidArgumentException when an invalid $filter is given
*
* @psalm-pure
*/
public static function filter(string $html, string $filter): string
{
switch ($filter) {
case self::STRIP:
return '';
case self::ESCAPE:
return \htmlspecialchars($html, \ENT_NOQUOTES);
case self::ALLOW:
return $html;
default:
throw new \InvalidArgumentException(\sprintf('Invalid filter provided: "%s"', $filter));
}
}
}
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