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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 = '')
{
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;
 
 
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