Primo Committ

vendor/league/commonmark/src/Util/Html5EntityDecoder.php

@@ -0,0 +1,63 @@
+<?php
+
+/*
+ * This file is part of the league/commonmark package.
+ *
+ * (c) Colin O'Dell <colinodell@gmail.com>
+ *
+ * Original code based on the CommonMark JS reference parser (https://bitly.com/commonmark-js)
+ *  - (c) John MacFarlane
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace League\CommonMark\Util;
+
+final class Html5EntityDecoder
+{
+    public static function decode(string $entity): string
+    {
+        if (\substr($entity, -1) !== ';') {
+            return $entity;
+        }
+
+        if (\substr($entity, 0, 2) === '&#') {
+            if (\strtolower(\substr($entity, 2, 1)) === 'x') {
+                return self::fromHex(\substr($entity, 3, -1));
+            }
+
+            return self::fromDecimal(\substr($entity, 2, -1));
+        }
+
+        return \html_entity_decode($entity, \ENT_QUOTES | \ENT_HTML5, 'UTF-8');
+    }
+
+    /**
+     * @param mixed $number
+     *
+     * @return string
+     */
+    private static function fromDecimal($number): string
+    {
+        // Only convert code points within planes 0-2, excluding NULL
+        if (empty($number) || $number > 0x2FFFF) {
+            return self::fromHex('fffd');
+        }
+
+        $entity = '&#' . $number . ';';
+
+        $converted = \mb_decode_numericentity($entity, [0x0, 0x2FFFF, 0, 0xFFFF], 'UTF-8');
+
+        if ($converted === $entity) {
+            return self::fromHex('fffd');
+        }
+
+        return $converted;
+    }
+
+    private static function fromHex(string $hexChars): string
+    {
+        return self::fromDecimal(\hexdec($hexChars));
+    }
+}