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<?php
/*
* This file is part of the league/commonmark package.
*
* (c) Colin O'Dell <colinodell@gmail.com>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
declare(strict_types=1);
namespace League\CommonMark\Normalizer;
/***
* Normalize text input using the steps given by the CommonMark spec to normalize labels
*
* @see https://spec.commonmark.org/0.29/#matches
*
* @psalm-immutable
*/
final class TextNormalizer implements TextNormalizerInterface
{
/**
* {@inheritDoc}
*
* @psalm-pure
*/
public function normalize(string $text, array $context = []): string
{
// Collapse internal whitespace to single space and remove
// leading/trailing whitespace
$text = \preg_replace('/[ \t\r\n]+/', ' ', \trim($text));
\assert(\is_string($text));
return \mb_convert_case($text, \MB_CASE_FOLD, 'UTF-8');
}
}
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