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Edit: Normalizer.php

<?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 Google\Site_Kit_Dependencies\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
{
    public const FORM_D = \Normalizer::FORM_D;
    public const FORM_KD = \Normalizer::FORM_KD;
    public const FORM_C = \Normalizer::FORM_C;
    public const FORM_KC = \Normalizer::FORM_KC;
    public const NFD = \Normalizer::NFD;
    public const NFKD = \Normalizer::NFKD;
    public const NFC = \Normalizer::NFC;
    public const NFKC = \Normalizer::NFKC;
    private static $C;
    private static $D;
    private static $KD;
    private static $cC;
    private static $ulenMask = ["\xc0" => 2, "\xd0" => 2, "\xe0" => 3, "\xf0" => 4];
    private static $ASCII = " eiasntrolud][cmp'\ng|hv.fb,:=-q10C2*yx)(L9AS/P\"EjMIk3>5T<D4}B{8FwR67UGN;JzV#HOW_&!K?XQ%Y\\\tZ+~^\$@`\x00\x01\x02\x03\x04\x05\x06\x07\x08\v\f\r\x0e\x0f\x10\x11\x12\x13\x14\x15\x16\x17\x18\x19\x1a\x1b\x1c\x1d\x1e\x1f";
    public static function isNormalized(string $s, int $form = self::FORM_C)
    {
        if (!\in_array($form, [self::NFD, self::NFKD, self::NFC, self::NFKC])) {
            return \false;
        }
        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(string $s, int $form = self::FORM_C)
    {
        if (!\preg_match('//u', $s)) {
            return \false;
        }
        switch ($form) {
            case self::NFC:
                $C = \true;
                $K = \false;
                break;
            case self::NFD:
                $C = \false;
                $K = \false;
                break;
            case self::NFKC:
                $C = \true;
                $K = \true;
                break;
            case self::NFKD:
                $C = \false;
                $K = \true;
                break;
            default:
                if (\defined('Normalizer::NONE') && \Normalizer::NONE == $form) {
                    return $s;
                }
                if (80000 > \PHP_VERSION_ID) {
                    return \false;
                }
                throw new \ValueError('normalizer_normalize(): Argument #2 ($form) must be a a valid normalization form');
        }
        if ('' === $s) {
            return '';
        }
        if ($K && null === self::$KD) {
            self::$KD = self::getData('compatibilityDecomposition');
        }
        if (null === self::$D) {
            self::$D = self::getData('canonicalDecomposition');
            self::$cC = self::getData('combiningClass');
        }
        if (null !== ($mbEncoding = 2 & (int) \ini_get('mbstring.func_overload') ? \mb_internal_encoding() : null)) {
            \mb_internal_encoding('8bit');
        }
        $r = self::decompose($s, $K);
        if ($C) {
            if (null === self::$C) {
                self::$C = self::getData('canonicalComposition');
            }
            $r = self::recompose($r);
        }
        if (null !== $mbEncoding) {
            \mb_internal_encoding($mbEncoding);
        }
        return $r;
    }
    private static function recompose($s)
    {
        $ASCII = self::$ASCII;
        $compMap = self::$C;
        $combClass = self::$cC;
        $ulenMask = self::$ulenMask;
        $result = $tail = '';
        $i = $s[0] < "\x80" ? 1 : $ulenMask[$s[0] & "\xf0"];
        $len = \strlen($s);
        $lastUchr = \substr($s, 0, $i);
        $lastUcls = isset($combClass[$lastUchr]) ? 256 : 0;
        while ($i < $len) {
            if ($s[$i] < "\x80") {
                // ASCII chars
                if ($tail) {
                    $lastUchr .= $tail;
                    $tail = '';
                }
                if ($j = \strspn($s, $ASCII, $i + 1)) {
                    $lastUchr .= \substr($s, $i, $j);
                    $i += $j;
                }
                $result .= $lastUchr;
                $lastUchr = $s[$i];
                $lastUcls = 0;
                ++$i;
                continue;
            }
            $ulen = $ulenMask[$s[$i] & "\xf0"];
            $uchr = \substr($s, $i, $ulen);
            if ($lastUchr < "ᄀ" || "ᄒ" < $lastUchr || $uchr < "ᅡ" || "ᅵ" < $uchr || $lastUcls) {
                // Table lookup and combining chars composition
                $ucls = $combClass[$uchr] ?? 0;
                if (isset($compMap[$lastUchr . $uchr]) && (!$lastUcls || $lastUcls < $ucls)) {
                    $lastUchr = $compMap[$lastUchr . $uchr];
                } elseif ($lastUcls = $ucls) {
                    $tail .= $uchr;
                } else {
                    if ($tail) {
                        $lastUchr .= $tail;
                        $tail = '';
                    }
                    $result .= $lastUchr;
                    $lastUchr = $uchr;
                }
            } else {
                // Hangul chars
                $L = \ord($lastUchr[2]) - 0x80;
                $V = \ord($uchr[2]) - 0xa1;
                $T = 0;
                $uchr = \substr($s, $i + $ulen, 3);
                if ("ᆧ" <= $uchr && $uchr <= "ᇂ") {
                    $T = \ord($uchr[2]) - 0xa7;
                    0 > $T && ($T += 0x40);
                    $ulen += 3;
                }
                $L = 0xac00 + ($L * 21 + $V) * 28 + $T;
                $lastUchr = \chr(0xe0 | $L >> 12) . \chr(0x80 | $L >> 6 & 0x3f) . \chr(0x80 | $L & 0x3f);
            }
            $i += $ulen;
        }
        return $result . $lastUchr . $tail;
    }
    private static function decompose($s, $c)
    {
        $result = '';
        $ASCII = self::$ASCII;
        $decompMap = self::$D;
        $combClass = self::$cC;
        $ulenMask = self::$ulenMask;
        if ($c) {
            $compatMap = self::$KD;
        }
        $c = [];
        $i = 0;
        $len = \strlen($s);
        while ($i < $len) {
            if ($s[$i] < "\x80") {
                // ASCII chars
                if ($c) {
                    \ksort($c);
                    $result .= \implode('', $c);
                    $c = [];
                }
                $j = 1 + \strspn($s, $ASCII, $i + 1);
                $result .= \substr($s, $i, $j);
                $i += $j;
                continue;
            }
            $ulen = $ulenMask[$s[$i] & "\xf0"];
            $uchr = \substr($s, $i, $ulen);
            $i += $ulen;
            if ($uchr < "가" || "힣" < $uchr) {
                // Table lookup
                if ($uchr !== ($j = $compatMap[$uchr] ?? $decompMap[$uchr] ?? $uchr)) {
                    $uchr = $j;
                    $j = \strlen($uchr);
                    $ulen = $uchr[0] < "\x80" ? 1 : $ulenMask[$uchr[0] & "\xf0"];
                    if ($ulen != $j) {
                        // Put trailing chars in $s
                        $j -= $ulen;
                        $i -= $j;
                        if (0 > $i) {
                            $s = \str_repeat(' ', -$i) . $s;
                            $len -= $i;
                            $i = 0;
                        }
                        while ($j--) {
                            $s[$i + $j] = $uchr[$ulen + $j];
                        }
                        $uchr = \substr($uchr, 0, $ulen);
                    }
                }
                if (isset($combClass[$uchr])) {
                    // Combining chars, for sorting
                    if (!isset($c[$combClass[$uchr]])) {
                        $c[$combClass[$uchr]] = '';
                    }
                    $c[$combClass[$uchr]] .= $uchr;
                    continue;
                }
            } else {
                // Hangul chars
                $uchr = \unpack('C*', $uchr);
                $j = ($uchr[1] - 224 << 12) + ($uchr[2] - 128 << 6) + $uchr[3] - 0xac80;
                $uchr = "\xe1\x84" . \chr(0x80 + (int) ($j / 588)) . "\xe1\x85" . \chr(0xa1 + (int) ($j % 588 / 28));
                if ($j %= 28) {
                    $uchr .= $j < 25 ? "\xe1\x86" . \chr(0xa7 + $j) : "\xe1\x87" . \chr(0x67 + $j);
                }
            }
            if ($c) {
                \ksort($c);
                $result .= \implode('', $c);
                $c = [];
            }
            $result .= $uchr;
        }
        if ($c) {
            \ksort($c);
            $result .= \implode('', $c);
        }
        return $result;
    }
    private static function getData($file)
    {
        if (\file_exists($file = __DIR__ . '/Resources/unidata/' . $file . '.php')) {
            return require $file;
        }
        return \false;
    }
}