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[EDIT] FILE: UnicodeString.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 Symfony\Component\String;

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

/**
 * Represents a string of Unicode grapheme clusters encoded as UTF-8.
 *
 * A letter followed by combining characters (accents typically) form what Unicode defines
 * as a grapheme cluster: a character as humans mean it in written texts. This class knows
 * about the concept and won't split a letter apart from its combining accents. It also
 * ensures all string comparisons happen on their canonically-composed representation,
 * ignoring e.g. the order in which accents are listed when a letter has many of them.
 *
 * @see https://unicode.org/reports/tr15/
 *
 * @author Nicolas Grekas <p@tchwork.com>
 * @author Hugo Hamon <hugohamon@neuf.fr>
 *
 * @throws ExceptionInterface
 */
class UnicodeString extends AbstractUnicodeString
{
    public function __construct(string $string = '')
    {
        if ('' === $string || normalizer_is_normalized($this->string = $string)) {
            return;
        }

if (false === $string = normalizer_normalize($string)) {
            throw new InvalidArgumentException('Invalid UTF-8 string.');
        }

$this->string = $string;
    }

public function append(string ...$suffix): static
    {
        $str = clone $this;
        $str->string = $this->string.(1 >= \count($suffix) ? ($suffix[0] ?? '') : implode('', $suffix));

if (normalizer_is_normalized($str->string)) {
            return $str;
        }

if (false === $string = normalizer_normalize($str->string)) {
            throw new InvalidArgumentException('Invalid UTF-8 string.');
        }

$str->string = $string;

return $str;
    }

public function chunk(int $length = 1): array
    {
        if (1 > $length) {
            throw new InvalidArgumentException('The chunk length must be greater than zero.');
        }

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

$rx = '/(';
        while (65535 < $length) {
            $rx .= '\X{65535}';
            $length -= 65535;
        }
        $rx .= '\X{'.$length.'})/u';

$str = clone $this;
        $chunks = [];

foreach (preg_split($rx, $this->string, -1, \PREG_SPLIT_DELIM_CAPTURE | \PREG_SPLIT_NO_EMPTY) as $chunk) {
            $str->string = $chunk;
            $chunks[] = clone $str;
        }

return $chunks;
    }

public function endsWith(string|iterable|AbstractString $suffix): bool
    {
        if ($suffix instanceof AbstractString) {
            $suffix = $suffix->string;
        } elseif (!\is_string($suffix)) {
            return parent::endsWith($suffix);
        }

$form = null === $this->ignoreCase ? \Normalizer::NFD : \Normalizer::NFC;
        normalizer_is_normalized($suffix, $form) ?: $suffix = normalizer_normalize($suffix, $form);

if ('' === $suffix || false === $suffix) {
            return false;
        }

if ($this->ignoreCase) {
            return 0 === mb_stripos(grapheme_extract($this->string, \strlen($suffix), \GRAPHEME_EXTR_MAXBYTES, \strlen($this->string) - \strlen($suffix)), $suffix, 0, 'UTF-8');
        }

return $suffix === grapheme_extract($this->string, \strlen($suffix), \GRAPHEME_EXTR_MAXBYTES, \strlen($this->string) - \strlen($suffix));
    }

public function equalsTo(string|iterable|AbstractString $string): bool
    {
        if ($string instanceof AbstractString) {
            $string = $string->string;
        } elseif (!\is_string($string)) {
            return parent::equalsTo($string);
        }

$form = null === $this->ignoreCase ? \Normalizer::NFD : \Normalizer::NFC;
        normalizer_is_normalized($string, $form) ?: $string = normalizer_normalize($string, $form);

if ('' !== $string && false !== $string && $this->ignoreCase) {
            return \strlen($string) === \strlen($this->string) && 0 === mb_stripos($this->string, $string, 0, 'UTF-8');
        }

return $string === $this->string;
    }

public function indexOf(string|iterable|AbstractString $needle, int $offset = 0): ?int
    {
        if ($needle instanceof AbstractString) {
            $needle = $needle->string;
        } elseif (!\is_string($needle)) {
            return parent::indexOf($needle, $offset);
        }

$form = null === $this->ignoreCase ? \Normalizer::NFD : \Normalizer::NFC;
        normalizer_is_normalized($needle, $form) ?: $needle = normalizer_normalize($needle, $form);

if ('' === $needle || false === $needle) {
            return null;
        }

try {
            $i = $this->ignoreCase ? grapheme_stripos($this->string, $needle, $offset) : grapheme_strpos($this->string, $needle, $offset);
        } catch (\ValueError) {
            return null;
        }

return false === $i ? null : $i;
    }

public function indexOfLast(string|iterable|AbstractString $needle, int $offset = 0): ?int
    {
        if ($needle instanceof AbstractString) {
            $needle = $needle->string;
        } elseif (!\is_string($needle)) {
            return parent::indexOfLast($needle, $offset);
        }

$form = null === $this->ignoreCase ? \Normalizer::NFD : \Normalizer::NFC;
        normalizer_is_normalized($needle, $form) ?: $needle = normalizer_normalize($needle, $form);

if ('' === $needle || false === $needle) {
            return null;
        }

$string = $this->string;

if (0 > $offset) {
            // workaround https://bugs.php.net/74264
            if (0 > $offset += grapheme_strlen($needle)) {
                $string = grapheme_substr($string, 0, $offset);
            }
            $offset = 0;
        }

$i = $this->ignoreCase ? grapheme_strripos($string, $needle, $offset) : grapheme_strrpos($string, $needle, $offset);

return false === $i ? null : $i;
    }

public function join(array $strings, ?string $lastGlue = null): static
    {
        $str = parent::join($strings, $lastGlue);
        normalizer_is_normalized($str->string) ?: $str->string = normalizer_normalize($str->string);

return $str;
    }

public function length(): int
    {
        return grapheme_strlen($this->string);
    }

public function normalize(int $form = self::NFC): static
    {
        $str = clone $this;

if (\in_array($form, [self::NFC, self::NFKC], true)) {
            normalizer_is_normalized($str->string, $form) ?: $str->string = normalizer_normalize($str->string, $form);
        } elseif (!\in_array($form, [self::NFD, self::NFKD], true)) {
            throw new InvalidArgumentException('Unsupported normalization form.');
        } elseif (!normalizer_is_normalized($str->string, $form)) {
            $str->string = normalizer_normalize($str->string, $form);
            $str->ignoreCase = null;
        }

return $str;
    }

public function prepend(string ...$prefix): static
    {
        $str = clone $this;
        $str->string = (1 >= \count($prefix) ? ($prefix[0] ?? '') : implode('', $prefix)).$this->string;

if (normalizer_is_normalized($str->string)) {
            return $str;
        }

if (false === $string = normalizer_normalize($str->string)) {
            throw new InvalidArgumentException('Invalid UTF-8 string.');
        }

$str->string = $string;

return $str;
    }

public function replace(string $from, string $to): static
    {
        $str = clone $this;
        normalizer_is_normalized($from) ?: $from = normalizer_normalize($from);

if ('' !== $from && false !== $from) {
            $tail = $str->string;
            $result = '';
            $indexOf = $this->ignoreCase ? 'grapheme_stripos' : 'grapheme_strpos';

while ('' !== $tail && false !== $i = $indexOf($tail, $from)) {
                $slice = grapheme_substr($tail, 0, $i);
                $result .= $slice.$to;
                $tail = substr($tail, \strlen($slice) + \strlen($from));
            }

$str->string = $result.$tail;

if (normalizer_is_normalized($str->string)) {
                return $str;
            }

if (false === $string = normalizer_normalize($str->string)) {
                throw new InvalidArgumentException('Invalid UTF-8 string.');
            }

$str->string = $string;
        }

return $str;
    }

public function replaceMatches(string $fromRegexp, string|callable $to): static
    {
        $str = parent::replaceMatches($fromRegexp, $to);
        normalizer_is_normalized($str->string) ?: $str->string = normalizer_normalize($str->string);

return $str;
    }

public function slice(int $start = 0, ?int $length = null): static
    {
        $str = clone $this;

$str->string = (string) grapheme_substr($this->string, $start, $length ?? 2147483647);

return $str;
    }

public function splice(string $replacement, int $start = 0, ?int $length = null): static
    {
        $str = clone $this;

$start = $start ? \strlen(grapheme_substr($this->string, 0, $start)) : 0;
        $length = $length ? \strlen(grapheme_substr($this->string, $start, $length ?? 2147483647)) : $length;
        $str->string = substr_replace($this->string, $replacement, $start, $length ?? 2147483647);

if (normalizer_is_normalized($str->string)) {
            return $str;
        }

if (false === $string = normalizer_normalize($str->string)) {
            throw new InvalidArgumentException('Invalid UTF-8 string.');
        }

$str->string = $string;

return $str;
    }

public function split(string $delimiter, ?int $limit = null, ?int $flags = null): array
    {
        if (1 > $limit ??= 2147483647) {
            throw new InvalidArgumentException('Split limit must be a positive integer.');
        }

if ('' === $delimiter) {
            throw new InvalidArgumentException('Split delimiter is empty.');
        }

if (null !== $flags) {
            return parent::split($delimiter.'u', $limit, $flags);
        }

normalizer_is_normalized($delimiter) ?: $delimiter = normalizer_normalize($delimiter);

if (false === $delimiter) {
            throw new InvalidArgumentException('Split delimiter is not a valid UTF-8 string.');
        }

$str = clone $this;
        $tail = $this->string;
        $chunks = [];
        $indexOf = $this->ignoreCase ? 'grapheme_stripos' : 'grapheme_strpos';

while (1 < $limit && false !== $i = $indexOf($tail, $delimiter)) {
            $str->string = grapheme_substr($tail, 0, $i);
            $chunks[] = clone $str;
            $tail = substr($tail, \strlen($str->string) + \strlen($delimiter));
            --$limit;
        }

$str->string = $tail;
        $chunks[] = clone $str;

return $chunks;
    }

public function startsWith(string|iterable|AbstractString $prefix): bool
    {
        if ($prefix instanceof AbstractString) {
            $prefix = $prefix->string;
        } elseif (!\is_string($prefix)) {
            return parent::startsWith($prefix);
        }

$form = null === $this->ignoreCase ? \Normalizer::NFD : \Normalizer::NFC;
        normalizer_is_normalized($prefix, $form) ?: $prefix = normalizer_normalize($prefix, $form);

if ('' === $prefix || false === $prefix) {
            return false;
        }

if ($this->ignoreCase) {
            return 0 === mb_stripos(grapheme_extract($this->string, \strlen($prefix), \GRAPHEME_EXTR_MAXBYTES), $prefix, 0, 'UTF-8');
        }

return $prefix === grapheme_extract($this->string, \strlen($prefix), \GRAPHEME_EXTR_MAXBYTES);
    }

public function trimPrefix($prefix): static
    {
        if (\is_array($prefix) || $prefix instanceof \Traversable) {
            return parent::trimPrefix($prefix);
        }

if ($prefix instanceof AbstractString) {
            $prefix = $prefix->string;
        } else {
            $prefix = (string) $prefix;
        }

if (!normalizer_is_normalized($prefix, \Normalizer::NFC)) {
            $prefix = normalizer_normalize($prefix, \Normalizer::NFC);
        }

return parent::trimPrefix($prefix);
    }

public function trimSuffix($suffix): static
    {
        if (\is_array($suffix) || $suffix instanceof \Traversable) {
            return parent::trimSuffix($suffix);
        }

if ($suffix instanceof AbstractString) {
            $suffix = $suffix->string;
        } else {
            $suffix = (string) $suffix;
        }

if (!normalizer_is_normalized($suffix, \Normalizer::NFC)) {
            $suffix = normalizer_normalize($suffix, \Normalizer::NFC);
        }

return parent::trimSuffix($suffix);
    }

/**
     * @return void
     */
    public function __wakeup()
    {
        if (!\is_string($this->string)) {
            throw new \BadMethodCallException('Cannot unserialize '.__CLASS__);
        }

normalizer_is_normalized($this->string) ?: $this->string = normalizer_normalize($this->string);
    }

public function __clone()
    {
        if (null === $this->ignoreCase) {
            normalizer_is_normalized($this->string) ?: $this->string = normalizer_normalize($this->string);
        }

$this->ignoreCase = false;
    }
}

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