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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\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 = '')
{
$this->string = normalizer_is_normalized($string) ? $string : normalizer_normalize($string);
if (false === $this->string) {
throw new InvalidArgumentException('Invalid UTF-8 string.');
}
}
public function append(string ...$suffix): static
{
$str = clone $this;
$str->string = $this->string.(1 >= \count($suffix) ? ($suffix[0] ?? '') : implode('', $suffix));
normalizer_is_normalized($str->string) ?: $str->string = normalizer_normalize($str->string);
if (false === $str->string) {
throw new InvalidArgumentException('Invalid UTF-8 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 $e) {
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;
normalizer_is_normalized($str->string) ?: $str->string = normalizer_normalize($str->string);
if (false === $str->string) {
throw new InvalidArgumentException('Invalid UTF-8 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;
normalizer_is_normalized($str->string) ?: $str->string = normalizer_normalize($str->string);
if (false === $str->string) {
throw new InvalidArgumentException('Invalid UTF-8 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, $length ?? 2147483647);
normalizer_is_normalized($str->string) ?: $str->string = normalizer_normalize($str->string);
if (false === $str->string) {
throw new InvalidArgumentException('Invalid UTF-8 string.');
}
return $str;
}
public function split(string $delimiter, int $limit = null, int $flags = null): array
{
if (1 > $limit = $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($prefix), \GRAPHEME_EXTR_MAXBYTES);
}
public function __wakeup()
{
if (!\is_string($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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