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<?php declare(strict_types=1);
/*
* This file is part of PHPUnit.
*
* (c) Sebastian Bergmann <sebastian@phpunit.de>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace PHPUnit\Util;
use const ENT_QUOTES;
use function htmlspecialchars;
use function mb_convert_encoding;
use function ord;
use function preg_replace;
use function strlen;
/**
* @internal This class is not covered by the backward compatibility promise for PHPUnit
*/
final class Xml
{
/**
* Escapes a string for the use in XML documents.
*
* Any Unicode character is allowed, excluding the surrogate blocks, FFFE,
* and FFFF (not even as character reference).
*
* @see https://www.w3.org/TR/xml/#charsets
*/
public static function prepareString(string $string): string
{
return preg_replace(
'/[\\x00-\\x08\\x0b\\x0c\\x0e-\\x1f\\x7f]/',
'',
htmlspecialchars(
self::convertToUtf8($string),
ENT_QUOTES,
),
);
}
private static function convertToUtf8(string $string): string
{
if (!self::isUtf8($string)) {
$string = mb_convert_encoding($string, 'UTF-8');
}
return $string;
}
private static function isUtf8(string $string): bool
{
$length = strlen($string);
for ($i = 0; $i < $length; $i++) {
if (ord($string[$i]) < 0x80) {
$n = 0;
} elseif ((ord($string[$i]) & 0xE0) === 0xC0) {
$n = 1;
} elseif ((ord($string[$i]) & 0xF0) === 0xE0) {
$n = 2;
} elseif ((ord($string[$i]) & 0xF0) === 0xF0) {
$n = 3;
} else {
return false;
}
for ($j = 0; $j < $n; $j++) {
if ((++$i === $length) || ((ord($string[$i]) & 0xC0) !== 0x80)) {
return false;
}
}
}
return true;
}
}
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