<?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\Component\String;

use Symfony\Component\String\Exception\ExceptionInterface;
use Symfony\Component\String\Exception\InvalidArgumentException;
use Symfony\Component\String\Exception\RuntimeException;

/**
 * Represents a string of abstract Unicode characters.
 *
 * Unicode defines 3 types of "characters" (bytes, code points and grapheme clusters).
 * This class is the abstract type to use as a type-hint when the logic you want to
 * implement is Unicode-aware but doesn't care about code points vs grapheme clusters.
 *
 * @author Nicolas Grekas <p@tchwork.com>
 *
 * @throws ExceptionInterface
 */
abstract class AbstractUnicodeString extends AbstractString
{
    public const NFC = \Normalizer::NFC;
    public const NFD = \Normalizer::NFD;
    public const NFKC = \Normalizer::NFKC;
    public const NFKD = \Normalizer::NFKD;

    // all ASCII letters sorted by typical frequency of occurrence
    private const 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";

    // the subset of folded case mappings that is not in lower case mappings
    private const FOLD_FROM = ['İ', 'µ', 'ſ', "\xCD\x85", 'ς', 'ϐ', 'ϑ', 'ϕ', 'ϖ', 'ϰ', 'ϱ', 'ϵ', 'ẛ', "\xE1\xBE\xBE", 'ß', 'İ', 'ʼn', 'ǰ', 'ΐ', 'ΰ', 'և', 'ẖ', 'ẗ', 'ẘ', 'ẙ', 'ẚ', 'ẞ', 'ὐ', 'ὒ', 'ὔ', 'ὖ', 'ᾀ', 'ᾁ', 'ᾂ', 'ᾃ', 'ᾄ', 'ᾅ', 'ᾆ', 'ᾇ', 'ᾈ', 'ᾉ', 'ᾊ', 'ᾋ', 'ᾌ', 'ᾍ', 'ᾎ', 'ᾏ', 'ᾐ', 'ᾑ', 'ᾒ', 'ᾓ', 'ᾔ', 'ᾕ', 'ᾖ', 'ᾗ', 'ᾘ', 'ᾙ', 'ᾚ', 'ᾛ', 'ᾜ', 'ᾝ', 'ᾞ', 'ᾟ', 'ᾠ', 'ᾡ', 'ᾢ', 'ᾣ', 'ᾤ', 'ᾥ', 'ᾦ', 'ᾧ', 'ᾨ', 'ᾩ', 'ᾪ', 'ᾫ', 'ᾬ', 'ᾭ', 'ᾮ', 'ᾯ', 'ᾲ', 'ᾳ', 'ᾴ', 'ᾶ', 'ᾷ', 'ᾼ', 'ῂ', 'ῃ', 'ῄ', 'ῆ', 'ῇ', 'ῌ', 'ῒ', 'ΐ', 'ῖ', 'ῗ', 'ῢ', 'ΰ', 'ῤ', 'ῦ', 'ῧ', 'ῲ', 'ῳ', 'ῴ', 'ῶ', 'ῷ', 'ῼ', 'ff', 'fi', 'fl', 'ffi', 'ffl', 'ſt', 'st', 'ﬓ', 'ﬔ', 'ﬕ', 'ﬖ', 'ﬗ'];
    private const FOLD_TO = ['i̇', 'μ', 's', 'ι', 'σ', 'β', 'θ', 'φ', 'π', 'κ', 'ρ', 'ε', 'ṡ', 'ι', 'ss', 'i̇', 'ʼn', 'ǰ', 'ΐ', 'ΰ', 'եւ', 'ẖ', 'ẗ', 'ẘ', 'ẙ', 'aʾ', 'ss', 'ὐ', 'ὒ', 'ὔ', 'ὖ', 'ἀι', 'ἁι', 'ἂι', 'ἃι', 'ἄι', 'ἅι', 'ἆι', 'ἇι', 'ἀι', 'ἁι', 'ἂι', 'ἃι', 'ἄι', 'ἅι', 'ἆι', 'ἇι', 'ἠι', 'ἡι', 'ἢι', 'ἣι', 'ἤι', 'ἥι', 'ἦι', 'ἧι', 'ἠι', 'ἡι', 'ἢι', 'ἣι', 'ἤι', 'ἥι', 'ἦι', 'ἧι', 'ὠι', 'ὡι', 'ὢι', 'ὣι', 'ὤι', 'ὥι', 'ὦι', 'ὧι', 'ὠι', 'ὡι', 'ὢι', 'ὣι', 'ὤι', 'ὥι', 'ὦι', 'ὧι', 'ὰι', 'αι', 'άι', 'ᾶ', 'ᾶι', 'αι', 'ὴι', 'ηι', 'ήι', 'ῆ', 'ῆι', 'ηι', 'ῒ', 'ΐ', 'ῖ', 'ῗ', 'ῢ', 'ΰ', 'ῤ', 'ῦ', 'ῧ', 'ὼι', 'ωι', 'ώι', 'ῶ', 'ῶι', 'ωι', 'ff', 'fi', 'fl', 'ffi', 'ffl', 'st', 'st', 'մն', 'մե', 'մի', 'վն', 'մխ'];

    // the subset of upper case mappings that map one code point to many code points
    private const UPPER_FROM = ['ß', 'ff', 'fi', 'fl', 'ffi', 'ffl', 'ſt', 'st', 'և', 'ﬓ', 'ﬔ', 'ﬕ', 'ﬖ', 'ﬗ', 'ʼn', 'ΐ', 'ΰ', 'ǰ', 'ẖ', 'ẗ', 'ẘ', 'ẙ', 'ẚ', 'ὐ', 'ὒ', 'ὔ', 'ὖ', 'ᾶ', 'ῆ', 'ῒ', 'ΐ', 'ῖ', 'ῗ', 'ῢ', 'ΰ', 'ῤ', 'ῦ', 'ῧ', 'ῶ'];
    private const UPPER_TO = ['SS', 'FF', 'FI', 'FL', 'FFI', 'FFL', 'ST', 'ST', 'ԵՒ', 'ՄՆ', 'ՄԵ', 'ՄԻ', 'ՎՆ', 'ՄԽ', 'ʼN', 'Ϊ́', 'Ϋ́', 'J̌', 'H̱', 'T̈', 'W̊', 'Y̊', 'Aʾ', 'Υ̓', 'Υ̓̀', 'Υ̓́', 'Υ̓͂', 'Α͂', 'Η͂', 'Ϊ̀', 'Ϊ́', 'Ι͂', 'Ϊ͂', 'Ϋ̀', 'Ϋ́', 'Ρ̓', 'Υ͂', 'Ϋ͂', 'Ω͂'];

    // the subset of https://github.com/unicode-org/cldr/blob/master/common/transforms/Latin-ASCII.xml that is not in NFKD
    private const TRANSLIT_FROM = ['Æ', 'Ð', 'Ø', 'Þ', 'ß', 'æ', 'ð', 'ø', 'þ', 'Đ', 'đ', 'Ħ', 'ħ', 'ı', 'ĸ', 'Ŀ', 'ŀ', 'Ł', 'ł', 'ʼn', 'Ŋ', 'ŋ', 'Œ', 'œ', 'Ŧ', 'ŧ', 'ƀ', 'Ɓ', 'Ƃ', 'ƃ', 'Ƈ', 'ƈ', 'Ɖ', 'Ɗ', 'Ƌ', 'ƌ', 'Ɛ', 'Ƒ', 'ƒ', 'Ɠ', 'ƕ', 'Ɩ', 'Ɨ', 'Ƙ', 'ƙ', 'ƚ', 'Ɲ', 'ƞ', 'Ƣ', 'ƣ', 'Ƥ', 'ƥ', 'ƫ', 'Ƭ', 'ƭ', 'Ʈ', 'Ʋ', 'Ƴ', 'ƴ', 'Ƶ', 'ƶ', 'DŽ', 'Dž', 'dž', 'Ǥ', 'ǥ', 'ȡ', 'Ȥ', 'ȥ', 'ȴ', 'ȵ', 'ȶ', 'ȷ', 'ȸ', 'ȹ', 'Ⱥ', 'Ȼ', 'ȼ', 'Ƚ', 'Ⱦ', 'ȿ', 'ɀ', 'Ƀ', 'Ʉ', 'Ɇ', 'ɇ', 'Ɉ', 'ɉ', 'Ɍ', 'ɍ', 'Ɏ', 'ɏ', 'ɓ', 'ɕ', 'ɖ', 'ɗ', 'ɛ', 'ɟ', 'ɠ', 'ɡ', 'ɢ', 'ɦ', 'ɧ', 'ɨ', 'ɪ', 'ɫ', 'ɬ', 'ɭ', 'ɱ', 'ɲ', 'ɳ', 'ɴ', 'ɶ', 'ɼ', 'ɽ', 'ɾ', 'ʀ', 'ʂ', 'ʈ', 'ʉ', 'ʋ', 'ʏ', 'ʐ', 'ʑ', 'ʙ', 'ʛ', 'ʜ', 'ʝ', 'ʟ', 'ʠ', 'ʣ', 'ʥ', 'ʦ', 'ʪ', 'ʫ', 'ᴀ', 'ᴁ', 'ᴃ', 'ᴄ', 'ᴅ', 'ᴆ', 'ᴇ', 'ᴊ', 'ᴋ', 'ᴌ', 'ᴍ', 'ᴏ', 'ᴘ', 'ᴛ', 'ᴜ', 'ᴠ', 'ᴡ', 'ᴢ', 'ᵫ', 'ᵬ', 'ᵭ', 'ᵮ', 'ᵯ', 'ᵰ', 'ᵱ', 'ᵲ', 'ᵳ', 'ᵴ', 'ᵵ', 'ᵶ', 'ᵺ', 'ᵻ', 'ᵽ', 'ᵾ', 'ᶀ', 'ᶁ', 'ᶂ', 'ᶃ', 'ᶄ', 'ᶅ', 'ᶆ', 'ᶇ', 'ᶈ', 'ᶉ', 'ᶊ', 'ᶌ', 'ᶍ', 'ᶎ', 'ᶏ', 'ᶑ', 'ᶒ', 'ᶓ', 'ᶖ', 'ᶙ', 'ẚ', 'ẜ', 'ẝ', 'ẞ', 'Ỻ', 'ỻ', 'Ỽ', 'ỽ', 'Ỿ', 'ỿ', '©', '®', '₠', '₢', '₣', '₤', '₧', '₺', '₹', 'ℌ', '℞', '㎧', '㎮', '㏆', '㏗', '㏞', '㏟', '¼', '½', '¾', '⅓', '⅔', '⅕', '⅖', '⅗', '⅘', '⅙', '⅚', '⅛', '⅜', '⅝', '⅞', '⅟', '〇', '‘', '’', '‚', '‛', '“', '”', '„', '‟', '′', '″', '〝', '〞', '«', '»', '‹', '›', '‐', '‑', '‒', '–', '—', '―', '︱', '︲', '﹘', '‖', '⁄', '⁅', '⁆', '⁎', '、', '。', '〈', '〉', '《', '》', '〔', '〕', '〘', '〙', '〚', '〛', '︑', '︒', '︹', '︺', '︽', '︾', '︿', '﹀', '﹑', '﹝', '﹞', '｟', '｠', '｡', '､', '×', '÷', '−', '∕', '∖', '∣', '∥', '≪', '≫', '⦅', '⦆'];
    private const TRANSLIT_TO = ['AE', 'D', 'O', 'TH', 'ss', 'ae', 'd', 'o', 'th', 'D', 'd', 'H', 'h', 'i', 'q', 'L', 'l', 'L', 'l', '\'n', 'N', 'n', 'OE', 'oe', 'T', 't', 'b', 'B', 'B', 'b', 'C', 'c', 'D', 'D', 'D', 'd', 'E', 'F', 'f', 'G', 'hv', 'I', 'I', 'K', 'k', 'l', 'N', 'n', 'OI', 'oi', 'P', 'p', 't', 'T', 't', 'T', 'V', 'Y', 'y', 'Z', 'z', 'DZ', 'Dz', 'dz', 'G', 'g', 'd', 'Z', 'z', 'l', 'n', 't', 'j', 'db', 'qp', 'A', 'C', 'c', 'L', 'T', 's', 'z', 'B', 'U', 'E', 'e', 'J', 'j', 'R', 'r', 'Y', 'y', 'b', 'c', 'd', 'd', 'e', 'j', 'g', 'g', 'G', 'h', 'h', 'i', 'I', 'l', 'l', 'l', 'm', 'n', 'n', 'N', 'OE', 'r', 'r', 'r', 'R', 's', 't', 'u', 'v', 'Y', 'z', 'z', 'B', 'G', 'H', 'j', 'L', 'q', 'dz', 'dz', 'ts', 'ls', 'lz', 'A', 'AE', 'B', 'C', 'D', 'D', 'E', 'J', 'K', 'L', 'M', 'O', 'P', 'T', 'U', 'V', 'W', 'Z', 'ue', 'b', 'd', 'f', 'm', 'n', 'p', 'r', 'r', 's', 't', 'z', 'th', 'I', 'p', 'U', 'b', 'd', 'f', 'g', 'k', 'l', 'm', 'n', 'p', 'r', 's', 'v', 'x', 'z', 'a', 'd', 'e', 'e', 'i', 'u', 'a', 's', 's', 'SS', 'LL', 'll', 'V', 'v', 'Y', 'y', '(C)', '(R)', 'CE', 'Cr', 'Fr.', 'L.', 'Pts', 'TL', 'Rs', 'x', 'Rx', 'm/s', 'rad/s', 'C/kg', 'pH', 'V/m', 'A/m', ' 1/4', ' 1/2', ' 3/4', ' 1/3', ' 2/3', ' 1/5', ' 2/5', ' 3/5', ' 4/5', ' 1/6', ' 5/6', ' 1/8', ' 3/8', ' 5/8', ' 7/8', ' 1/', '0', '\'', '\'', ',', '\'', '"', '"', ',,', '"', '\'', '"', '"', '"', '<<', '>>', '<', '>', '-', '-', '-', '-', '-', '-', '-', '-', '-', '||', '/', '[', ']', '*', ',', '.', '<', '>', '<<', '>>', '[', ']', '[', ']', '[', ']', ',', '.', '[', ']', '<<', '>>', '<', '>', ',', '[', ']', '((', '))', '.', ',', '*', '/', '-', '/', '\\', '|', '||', '<<', '>>', '((', '))'];

    private static $transliterators = [];
    private static $tableZero;
    private static $tableWide;

    public static function fromCodePoints(int ...$codes): static
    {
        $string = '';

        foreach ($codes as $code) {
            if (0x80 > $code %= 0x200000) {
                $string .= \chr($code);
            } elseif (0x800 > $code) {
                $string .= \chr(0xC0 | $code >> 6).\chr(0x80 | $code & 0x3F);
            } elseif (0x10000 > $code) {
                $string .= \chr(0xE0 | $code >> 12).\chr(0x80 | $code >> 6 & 0x3F).\chr(0x80 | $code & 0x3F);
            } else {
                $string .= \chr(0xF0 | $code >> 18).\chr(0x80 | $code >> 12 & 0x3F).\chr(0x80 | $code >> 6 & 0x3F).\chr(0x80 | $code & 0x3F);
            }
        }

        return new static($string);
    }

    /**
     * Generic UTF-8 to ASCII transliteration.
     *
     * Install the intl extension for best results.
     *
     * @param string[]|\Transliterator[]|\Closure[] $rules See "*-Latin" rules from Transliterator::listIDs()
     */
    public function ascii(array $rules = []): self
    {
        $str = clone $this;
        $s = $str->string;
        $str->string = '';

        array_unshift($rules, 'nfd');
        $rules[] = 'latin-ascii';

        if (\function_exists('transliterator_transliterate')) {
            $rules[] = 'any-latin/bgn';
        }

        $rules[] = 'nfkd';
        $rules[] = '[:nonspacing mark:] remove';

        while (\strlen($s) - 1 > $i = strspn($s, self::ASCII)) {
            if (0 < --$i) {
                $str->string .= substr($s, 0, $i);
                $s = substr($s, $i);
            }

            if (!$rule = array_shift($rules)) {
                $rules = []; // An empty rule interrupts the next ones
            }

            if ($rule instanceof \Transliterator) {
                $s = $rule->transliterate($s);
            } elseif ($rule instanceof \Closure) {
                $s = $rule($s);
            } elseif ($rule) {
                if ('nfd' === $rule = strtolower($rule)) {
                    normalizer_is_normalized($s, self::NFD) ?: $s = normalizer_normalize($s, self::NFD);
                } elseif ('nfkd' === $rule) {
                    normalizer_is_normalized($s, self::NFKD) ?: $s = normalizer_normalize($s, self::NFKD);
                } elseif ('[:nonspacing mark:] remove' === $rule) {
                    $s = preg_replace('/\p{Mn}++/u', '', $s);
                } elseif ('latin-ascii' === $rule) {
                    $s = str_replace(self::TRANSLIT_FROM, self::TRANSLIT_TO, $s);
                } elseif ('de-ascii' === $rule) {
                    $s = preg_replace("/([AUO])\u{0308}(?=\p{Ll})/u", '$1e', $s);
                    $s = str_replace(["a\u{0308}", "o\u{0308}", "u\u{0308}", "A\u{0308}", "O\u{0308}", "U\u{0308}"], ['ae', 'oe', 'ue', 'AE', 'OE', 'UE'], $s);
                } elseif (\function_exists('transliterator_transliterate')) {
                    if (null === $transliterator = self::$transliterators[$rule] ?? self::$transliterators[$rule] = \Transliterator::create($rule)) {
                        if ('any-latin/bgn' === $rule) {
                            $rule = 'any-latin';
                            $transliterator = self::$transliterators[$rule] ?? self::$transliterators[$rule] = \Transliterator::create($rule);
                        }

                        if (null === $transliterator) {
                            throw new InvalidArgumentException(sprintf('Unknown transliteration rule "%s".', $rule));
                        }

                        self::$transliterators['any-latin/bgn'] = $transliterator;
                    }

                    $s = $transliterator->transliterate($s);
                }
            } elseif (!\function_exists('iconv')) {
                $s = preg_replace('/[^\x00-\x7F]/u', '?', $s);
            } else {
                $s = @preg_replace_callback('/[^\x00-\x7F]/u', static function ($c) {
                    $c = (string) iconv('UTF-8', 'ASCII//TRANSLIT', $c[0]);

                    if ('' === $c && '' === iconv('UTF-8', 'ASCII//TRANSLIT', '²')) {
                        throw new \LogicException(sprintf('"%s" requires a translit-able iconv implementation, try installing "gnu-libiconv" if you\'re using Alpine Linux.', static::class));
                    }

                    return 1 < \strlen($c) ? ltrim($c, '\'`"^~') : ('' !== $c ? $c : '?');
                }, $s);
            }
        }

        $str->string .= $s;

        return $str;
    }

    public function camel(): static
    {
        $str = clone $this;
        $str->string = str_replace(' ', '', preg_replace_callback('/\b.(?![A-Z]{2,})/u', static function ($m) use (&$i) {
            return 1 === ++$i ? ('İ' === $m[0] ? 'i̇' : mb_strtolower($m[0], 'UTF-8')) : mb_convert_case($m[0], \MB_CASE_TITLE, 'UTF-8');
        }, preg_replace('/[^\pL0-9]++/u', ' ', $this->string)));

        return $str;
    }

    /**
     * @return int[]
     */
    public function codePointsAt(int $offset): array
    {
        $str = $this->slice($offset, 1);

        if ('' === $str->string) {
            return [];
        }

        $codePoints = [];

        foreach (preg_split('//u', $str->string, -1, \PREG_SPLIT_NO_EMPTY) as $c) {
            $codePoints[] = mb_ord($c, 'UTF-8');
        }

        return $codePoints;
    }

    public function folded(bool $compat = true): static
    {
        $str = clone $this;

        if (!$compat || !\defined('Normalizer::NFKC_CF')) {
            $str->string = normalizer_normalize($str->string, $compat ? \Normalizer::NFKC : \Normalizer::NFC);
            $str->string = mb_strtolower(str_replace(self::FOLD_FROM, self::FOLD_TO, $this->string), 'UTF-8');
        } else {
            $str->string = normalizer_normalize($str->string, \Normalizer::NFKC_CF);
        }

        return $str;
    }

    public function join(array $strings, string $lastGlue = null): static
    {
        $str = clone $this;

        $tail = null !== $lastGlue && 1 < \count($strings) ? $lastGlue.array_pop($strings) : '';
        $str->string = implode($this->string, $strings).$tail;

        if (!preg_match('//u', $str->string)) {
            throw new InvalidArgumentException('Invalid UTF-8 string.');
        }

        return $str;
    }

    public function lower(): static
    {
        $str = clone $this;
        $str->string = mb_strtolower(str_replace('İ', 'i̇', $str->string), 'UTF-8');

        return $str;
    }

    public function match(string $regexp, int $flags = 0, int $offset = 0): array
    {
        $match = ((\PREG_PATTERN_ORDER | \PREG_SET_ORDER) & $flags) ? 'preg_match_all' : 'preg_match';

        if ($this->ignoreCase) {
            $regexp .= 'i';
        }

        set_error_handler(static function ($t, $m) { throw new InvalidArgumentException($m); });

        try {
            if (false === $match($regexp.'u', $this->string, $matches, $flags | \PREG_UNMATCHED_AS_NULL, $offset)) {
                $lastError = preg_last_error();

                foreach (get_defined_constants(true)['pcre'] as $k => $v) {
                    if ($lastError === $v && '_ERROR' === substr($k, -6)) {
                        throw new RuntimeException('Matching failed with '.$k.'.');
                    }
                }

                throw new RuntimeException('Matching failed with unknown error code.');
            }
        } finally {
            restore_error_handler();
        }

        return $matches;
    }

    public function normalize(int $form = self::NFC): static
    {
        if (!\in_array($form, [self::NFC, self::NFD, self::NFKC, self::NFKD])) {
            throw new InvalidArgumentException('Unsupported normalization form.');
        }

        $str = clone $this;
        normalizer_is_normalized($str->string, $form) ?: $str->string = normalizer_normalize($str->string, $form);

        return $str;
    }

    public function padBoth(int $length, string $padStr = ' '): static
    {
        if ('' === $padStr || !preg_match('//u', $padStr)) {
            throw new InvalidArgumentException('Invalid UTF-8 string.');
        }

        $pad = clone $this;
        $pad->string = $padStr;

        return $this->pad($length, $pad, \STR_PAD_BOTH);
    }

    public function padEnd(int $length, string $padStr = ' '): static
    {
        if ('' === $padStr || !preg_match('//u', $padStr)) {
            throw new InvalidArgumentException('Invalid UTF-8 string.');
        }

        $pad = clone $this;
        $pad->string = $padStr;

        return $this->pad($length, $pad, \STR_PAD_RIGHT);
    }

    public function padStart(int $length, string $padStr = ' '): static
    {
        if ('' === $padStr || !preg_match('//u', $padStr)) {
            throw new InvalidArgumentException('Invalid UTF-8 string.');
        }

        $pad = clone $this;
        $pad->string = $padStr;

        return $this->pad($length, $pad, \STR_PAD_LEFT);
    }

    public function replaceMatches(string $fromRegexp, string|callable $to): static
    {
        if ($this->ignoreCase) {
            $fromRegexp .= 'i';
        }

        if (\is_array($to) || $to instanceof \Closure) {
            $replace = 'preg_replace_callback';
            $to = static function (array $m) use ($to): string {
                $to = $to($m);

                if ('' !== $to && (!\is_string($to) || !preg_match('//u', $to))) {
                    throw new InvalidArgumentException('Replace callback must return a valid UTF-8 string.');
                }

                return $to;
            };
        } elseif ('' !== $to && !preg_match('//u', $to)) {
            throw new InvalidArgumentException('Invalid UTF-8 string.');
        } else {
            $replace = 'preg_replace';
        }

        set_error_handler(static function ($t, $m) { throw new InvalidArgumentException($m); });

        try {
            if (null === $string = $replace($fromRegexp.'u', $to, $this->string)) {
                $lastError = preg_last_error();

                foreach (get_defined_constants(true)['pcre'] as $k => $v) {
                    if ($lastError === $v && '_ERROR' === substr($k, -6)) {
                        throw new RuntimeException('Matching failed with '.$k.'.');
                    }
                }

                throw new RuntimeException('Matching failed with unknown error code.');
            }
        } finally {
            restore_error_handler();
        }

        $str = clone $this;
        $str->string = $string;

        return $str;
    }

    public function reverse(): static
    {
        $str = clone $this;
        $str->string = implode('', array_reverse(preg_split('/(\X)/u', $str->string, -1, \PREG_SPLIT_DELIM_CAPTURE | \PREG_SPLIT_NO_EMPTY)));

        return $str;
    }

    public function snake(): static
    {
        $str = $this->camel();
        $str->string = mb_strtolower(preg_replace(['/(\p{Lu}+)(\p{Lu}\p{Ll})/u', '/([\p{Ll}0-9])(\p{Lu})/u'], '\1_\2', $str->string), 'UTF-8');

        return $str;
    }

    public function title(bool $allWords = false): static
    {
        $str = clone $this;

        $limit = $allWords ? -1 : 1;

        $str->string = preg_replace_callback('/\b./u', static function (array $m): string {
            return mb_convert_case($m[0], \MB_CASE_TITLE, 'UTF-8');
        }, $str->string, $limit);

        return $str;
    }

    public function trim(string $chars = " \t\n\r\0\x0B\x0C\u{A0}\u{FEFF}"): static
    {
        if (" \t\n\r\0\x0B\x0C\u{A0}\u{FEFF}" !== $chars && !preg_match('//u', $chars)) {
            throw new InvalidArgumentException('Invalid UTF-8 chars.');
        }
        $chars = preg_quote($chars);

        $str = clone $this;
        $str->string = preg_replace("{^[$chars]++|[$chars]++$}uD", '', $str->string);

        return $str;
    }

    public function trimEnd(string $chars = " \t\n\r\0\x0B\x0C\u{A0}\u{FEFF}"): static
    {
        if (" \t\n\r\0\x0B\x0C\u{A0}\u{FEFF}" !== $chars && !preg_match('//u', $chars)) {
            throw new InvalidArgumentException('Invalid UTF-8 chars.');
        }
        $chars = preg_quote($chars);

        $str = clone $this;
        $str->string = preg_replace("{[$chars]++$}uD", '', $str->string);

        return $str;
    }

    public function trimPrefix($prefix): static
    {
        if (!$this->ignoreCase) {
            return parent::trimPrefix($prefix);
        }

        $str = clone $this;

        if ($prefix instanceof \Traversable) {
            $prefix = iterator_to_array($prefix, false);
        } elseif ($prefix instanceof parent) {
            $prefix = $prefix->string;
        }

        $prefix = implode('|', array_map('preg_quote', (array) $prefix));
        $str->string = preg_replace("{^(?:$prefix)}iuD", '', $this->string);

        return $str;
    }

    public function trimStart(string $chars = " \t\n\r\0\x0B\x0C\u{A0}\u{FEFF}"): static
    {
        if (" \t\n\r\0\x0B\x0C\u{A0}\u{FEFF}" !== $chars && !preg_match('//u', $chars)) {
            throw new InvalidArgumentException('Invalid UTF-8 chars.');
        }
        $chars = preg_quote($chars);

        $str = clone $this;
        $str->string = preg_replace("{^[$chars]++}uD", '', $str->string);

        return $str;
    }

    public function trimSuffix($suffix): static
    {
        if (!$this->ignoreCase) {
            return parent::trimSuffix($suffix);
        }

        $str = clone $this;

        if ($suffix instanceof \Traversable) {
            $suffix = iterator_to_array($suffix, false);
        } elseif ($suffix instanceof parent) {
            $suffix = $suffix->string;
        }

        $suffix = implode('|', array_map('preg_quote', (array) $suffix));
        $str->string = preg_replace("{(?:$suffix)$}iuD", '', $this->string);

        return $str;
    }

    public function upper(): static
    {
        $str = clone $this;
        $str->string = mb_strtoupper($str->string, 'UTF-8');

        return $str;
    }

    public function width(bool $ignoreAnsiDecoration = true): int
    {
        $width = 0;
        $s = str_replace(["\x00", "\x05", "\x07"], '', $this->string);

        if (false !== strpos($s, "\r")) {
            $s = str_replace(["\r\n", "\r"], "\n", $s);
        }

        if (!$ignoreAnsiDecoration) {
            $s = preg_replace('/[\p{Cc}\x7F]++/u', '', $s);
        }

        foreach (explode("\n", $s) as $s) {
            if ($ignoreAnsiDecoration) {
                $s = preg_replace('/(?:\x1B(?:
                    \[ [\x30-\x3F]*+ [\x20-\x2F]*+ [\x40-\x7E]
                    | [P\]X^_] .*? \x1B\\\\
                    | [\x41-\x7E]
                )|[\p{Cc}\x7F]++)/xu', '', $s);
            }

            $lineWidth = $this->wcswidth($s);

            if ($lineWidth > $width) {
                $width = $lineWidth;
            }
        }

        return $width;
    }

    private function pad(int $len, self $pad, int $type): static
    {
        $sLen = $this->length();

        if ($len <= $sLen) {
            return clone $this;
        }

        $padLen = $pad->length();
        $freeLen = $len - $sLen;
        $len = $freeLen % $padLen;

        switch ($type) {
            case \STR_PAD_RIGHT:
                return $this->append(str_repeat($pad->string, intdiv($freeLen, $padLen)).($len ? $pad->slice(0, $len) : ''));

            case \STR_PAD_LEFT:
                return $this->prepend(str_repeat($pad->string, intdiv($freeLen, $padLen)).($len ? $pad->slice(0, $len) : ''));

            case \STR_PAD_BOTH:
                $freeLen /= 2;

                $rightLen = ceil($freeLen);
                $len = $rightLen % $padLen;
                $str = $this->append(str_repeat($pad->string, intdiv($rightLen, $padLen)).($len ? $pad->slice(0, $len) : ''));

                $leftLen = floor($freeLen);
                $len = $leftLen % $padLen;

                return $str->prepend(str_repeat($pad->string, intdiv($leftLen, $padLen)).($len ? $pad->slice(0, $len) : ''));

            default:
                throw new InvalidArgumentException('Invalid padding type.');
        }
    }

    /**
     * Based on https://github.com/jquast/wcwidth, a Python implementation of https://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c.
     */
    private function wcswidth(string $string): int
    {
        $width = 0;

        foreach (preg_split('//u', $string, -1, \PREG_SPLIT_NO_EMPTY) as $c) {
            $codePoint = mb_ord($c, 'UTF-8');

            if (0 === $codePoint // NULL
                || 0x034F === $codePoint // COMBINING GRAPHEME JOINER
                || (0x200B <= $codePoint && 0x200F >= $codePoint) // ZERO WIDTH SPACE to RIGHT-TO-LEFT MARK
                || 0x2028 === $codePoint // LINE SEPARATOR
                || 0x2029 === $codePoint // PARAGRAPH SEPARATOR
                || (0x202A <= $codePoint && 0x202E >= $codePoint) // LEFT-TO-RIGHT EMBEDDING to RIGHT-TO-LEFT OVERRIDE
                || (0x2060 <= $codePoint && 0x2063 >= $codePoint) // WORD JOINER to INVISIBLE SEPARATOR
            ) {
                continue;
            }

            // Non printable characters
            if (32 > $codePoint // C0 control characters
                || (0x07F <= $codePoint && 0x0A0 > $codePoint) // C1 control characters and DEL
            ) {
                return -1;
            }

            if (null === self::$tableZero) {
                self::$tableZero = require __DIR__.'/Resources/data/wcswidth_table_zero.php';
            }

            if ($codePoint >= self::$tableZero[0][0] && $codePoint <= self::$tableZero[$ubound = \count(self::$tableZero) - 1][1]) {
                $lbound = 0;
                while ($ubound >= $lbound) {
                    $mid = floor(($lbound + $ubound) / 2);

                    if ($codePoint > self::$tableZero[$mid][1]) {
                        $lbound = $mid + 1;
                    } elseif ($codePoint < self::$tableZero[$mid][0]) {
                        $ubound = $mid - 1;
                    } else {
                        continue 2;
                    }
                }
            }

            if (null === self::$tableWide) {
                self::$tableWide = require __DIR__.'/Resources/data/wcswidth_table_wide.php';
            }

            if ($codePoint >= self::$tableWide[0][0] && $codePoint <= self::$tableWide[$ubound = \count(self::$tableWide) - 1][1]) {
                $lbound = 0;
                while ($ubound >= $lbound) {
                    $mid = floor(($lbound + $ubound) / 2);

                    if ($codePoint > self::$tableWide[$mid][1]) {
                        $lbound = $mid + 1;
                    } elseif ($codePoint < self::$tableWide[$mid][0]) {
                        $ubound = $mid - 1;
                    } else {
                        $width += 2;

                        continue 2;
                    }
                }
            }

            ++$width;
        }

        return $width;
    }
}

• [D] Exception
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• [F] AbstractString.php
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• [F] ByteString.php
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• [F] CHANGELOG.md
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• [F] CodePointString.php
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• [F] composer.json
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• [F] LazyString.php
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Enhancing Payment Security: The Role of Encryption and Tokenization in Digital Transactions

As digital transactions proliferate, ensuring robust payment security is more critical than ever. Two foundational technologies that are pivotal in this effort are encryption and tokenization.
Encryption is a process that transforms data into a secure format, known as ciphertext, which can only be deciphered using a specific decryption key. This means that even if data is intercepted during transmission, it remains unreadable and protected from unauthorized access. Encryption is essential in safeguarding sensitive payment information, such as credit card details and personal data, during online transactions.
Tokenization, on the other hand, involves substituting sensitive data with unique identifiers or "tokens." These tokens serve as placeholders and have no value outside of the specific transaction context. If intercepted, tokens are meaningless and cannot be used to access the original sensitive data. This method significantly reduces the risk of fraud and data breaches, as the actual payment information is not stored or transmitted.
Together, encryption and tokenization form a powerful security framework. Encryption ensures that data is protected during transmission, while tokenization minimizes the risk of exposing sensitive information by replacing it with secure, non-sensitive tokens.
These technologies are integral to modern payment platforms, providing a robust defense against cyber threats. By implementing advanced encryption and tokenization techniques, businesses can enhance the security of digital transactions, ensuring that users' financial and personal information remains safe. This comprehensive approach not only builds user trust but also fortifies the overall security infrastructure of digital payment systems. As cyber threats evolve, the continued advancement of encryption and tokenization will be crucial in maintaining secure and reliable payment processes.

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• Payment