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<?php |
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/* |
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* This file is part of the league/commonmark package. |
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* |
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* (c) Colin O'Dell <[email protected]> |
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* |
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* For the full copyright and license information, please view the LICENSE |
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* file that was distributed with this source code. |
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*/ |
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declare(strict_types=1); |
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namespace League\CommonMark\Normalizer; |
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/*** |
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* Normalize text input using the steps given by the CommonMark spec to normalize labels |
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* |
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* @see https://spec.commonmark.org/0.29/#matches |
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* |
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* @psalm-immutable |
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*/ |
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final class TextNormalizer implements TextNormalizerInterface |
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{ |
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/** |
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* Source: https://github.com/symfony/polyfill-mbstring/blob/master/Mbstring.php |
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*/ |
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private const CASE_FOLD = [ |
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['µ', 'ſ', "\xCD\x85", 'ς', "\xCF\x90", "\xCF\x91", "\xCF\x95", "\xCF\x96", "\xCF\xB0", "\xCF\xB1", "\xCF\xB5", "\xE1\xBA\x9B", "\xE1\xBE\xBE", "\xC3\x9F", "\xE1\xBA\x9E"], |
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['μ', 's', 'ι', 'σ', 'β', 'θ', 'φ', 'π', 'κ', 'ρ', 'ε', "\xE1\xB9\xA1", 'ι', 'ss', 'ss'], |
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]; |
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/** |
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* {@inheritdoc} |
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* |
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* @psalm-pure |
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*/ |
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public function normalize(string $text, $context = null): string |
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{ |
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// Collapse internal whitespace to single space and remove |
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// leading/trailing whitespace |
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$text = \preg_replace('/\s+/', ' ', \trim($text)); |
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\assert(\is_string($text)); |
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if (! \defined('MB_CASE_FOLD')) { |
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// We're not on a version of PHP (7.3+) which has this feature |
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$text = \str_replace(self::CASE_FOLD[0], self::CASE_FOLD[1], $text); |
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return \mb_strtolower($text, 'UTF-8'); |
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} |
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return \mb_convert_case($text, \MB_CASE_FOLD, 'UTF-8'); |
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} |
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} |
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thephpleague /
commonmark
