vendor/symfony/polyfill-intl-normalizer/Normalizer.php

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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\Polyfill\Intl\Normalizer;

/**
 * Normalizer is a PHP fallback implementation of the Normalizer class provided by the intl extension.
 *
 * It has been validated with Unicode 6.3 Normalization Conformance Test.
 * See http://www.unicode.org/reports/tr15/ for detailed info about Unicode normalizations.
 *
 * @author Nicolas Grekas <p@tchwork.com>
 *
 * @internal
 */
class Normalizer
{
    const FORM_D = \Normalizer::FORM_D;
    const FORM_KD = \Normalizer::FORM_KD;
    const FORM_C = \Normalizer::FORM_C;
    const FORM_KC = \Normalizer::FORM_KC;
    const NFD = \Normalizer::NFD;
    const NFKD = \Normalizer::NFKD;
    const NFC = \Normalizer::NFC;
    const NFKC = \Normalizer::NFKC;

    private static $C;
    private static $D;
    private static $KD;
    private static $cC;
    private static $ulenMask = array("\xC0" => 2, "\xD0" => 2, "\xE0" => 3, "\xF0" => 4);
    private static $ASCII = "\x20\x65\x69\x61\x73\x6E\x74\x72\x6F\x6C\x75\x64\x5D\x5B\x63\x6D\x70\x27\x0A\x67\x7C\x68\x76\x2E\x66\x62\x2C\x3A\x3D\x2D\x71\x31\x30\x43\x32\x2A\x79\x78\x29\x28\x4C\x39\x41\x53\x2F\x50\x22\x45\x6A\x4D\x49\x6B\x33\x3E\x35\x54\x3C\x44\x34\x7D\x42\x7B\x38\x46\x77\x52\x36\x37\x55\x47\x4E\x3B\x4A\x7A\x56\x23\x48\x4F\x57\x5F\x26\x21\x4B\x3F\x58\x51\x25\x59\x5C\x09\x5A\x2B\x7E\x5E\x24\x40\x60\x7F\x00\x01\x02\x03\x04\x05\x06\x07\x08\x0B\x0C\x0D\x0E\x0F\x10\x11\x12\x13\x14\x15\x16\x17\x18\x19\x1A\x1B\x1C\x1D\x1E\x1F";

    public static function isNormalized($s, $form = self::NFC)
    {
        if (!\in_array($form, array(self::NFD, self::NFKD, self::NFC, self::NFKC))) {
            return false;
        }
        $s = (string) $s;
        if (!isset($s[strspn($s, self::$ASCII)])) {
            return true;
        }
        if (self::NFC == $form && preg_match('//u', $s) && !preg_match('/[^\x00-\x{2FF}]/u', $s)) {
            return true;
        }

        return self::normalize($s, $form) === $s;
    }

    public static function normalize($s, $form = self::NFC)
    {
        $s = (string) $s;