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vendor/league/commonmark/src/Normalizer/SlugNormalizer.php

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+<?php
+
+declare(strict_types=1);
+
+/*
+ * 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.
+ */
+
+namespace League\CommonMark\Normalizer;
+
+/**
+ * Creates URL-friendly strings based on the given string input
+ */
+final class SlugNormalizer implements TextNormalizerInterface
+{
+    /**
+     * {@inheritdoc}
+     */
+    public function normalize(string $text, $context = null): string
+    {
+        // Trim whitespace
+        $slug = \trim($text);
+        // Convert to lowercase
+        $slug = \mb_strtolower($slug);
+        // Try replacing whitespace with a dash
+        $slug = \preg_replace('/\s+/u', '-', $slug) ?? $slug;
+        // Try removing characters other than letters, numbers, and marks.
+        $slug = \preg_replace('/[^\p{L}\p{Nd}\p{Nl}\p{M}-]+/u', '', $slug) ?? $slug;
+
+        return $slug;
+    }
+}