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Optimized Atomcms daily updated/vendor/symfony/html-sanitizer/TextSanitizer/StringSanitizer.php

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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\HtmlSanitizer\TextSanitizer;
+
+/**
+ * @internal
+ */
+final class StringSanitizer
+{
+    private const LOWERCASE = [
+        'ABCDEFGHIJKLMNOPQRSTUVWXYZ',
+        'abcdefghijklmnopqrstuvwxyz',
+    ];
+
+    private const REPLACEMENTS = [
+        [
+            // "&#34;" is shorter than "&quot;"
+            '&quot;',
+
+            // Fix several potential issues in how browsers interpret attributes values
+            '+',
+            '=',
+            '@',
+            '`',
+
+            // Some DB engines will transform UTF8 full-width characters their classical version
+            // if the data is saved in a non-UTF8 field
+            '＜',
+            '＞',
+            '＋',
+            '＝',
+            '＠',
+            '｀',
+        ],
+        [
+            '&#34;',
+
+            '&#43;',
+            '&#61;',
+            '&#64;',
+            '&#96;',
+
+            '&#xFF1C;',
+            '&#xFF1E;',
+            '&#xFF0B;',
+            '&#xFF1D;',
+            '&#xFF20;',
+            '&#xFF40;',
+        ],
+    ];
+
+    /**
+     * Applies a transformation to lowercase following W3C HTML Standard.
+     *
+     * @see https://w3c.github.io/html-reference/terminology.html#case-insensitive
+     */
+    public static function htmlLower(string $string): string
+    {
+        return strtr($string, self::LOWERCASE[0], self::LOWERCASE[1]);
+    }
+
+    /**
+     * Encodes the HTML entities in the given string for safe injection in a document's DOM.
+     */
+    public static function encodeHtmlEntities(string $string): string
+    {
+        return str_replace(
+            self::REPLACEMENTS[0],
+            self::REPLACEMENTS[1],
+            htmlspecialchars($string, \ENT_QUOTES | \ENT_SUBSTITUTE, 'UTF-8')
+        );
+    }
+}