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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

{

    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 = "\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(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 /* MB_OVERLOAD_STRING */ & (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 < "\xE1\x84\x80" || "\xE1\x84\x92" < $lastUchr

                || $uchr < "\xE1\x85\xA1" || "\xE1\x85\xB5" < $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 ("\xE1\x86\xA7" <= $uchr && $uchr <= "\xE1\x87\x82") {

                    $T = \ord($uchr[2]) - 0xA7;

                    $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 < "\xEA\xB0\x80" || "\xED\x9E\xA3" < $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;

    }

}