Linkify urls on the forum.

src/Parsers/BBCode/BBCodeParser.php

@@ -39,6 +39,7 @@ class BBCodeParser implements ParserInterface
                 // Links
                 new Tags\NamedUrlTag,
                 new Tags\UrlTag,
+                new Tags\LinkifyTag,
 
                 // Finally parse leftover newlines
                 new Tags\NewLineTag,

src/Parsers/BBCode/Tags/LinkifyTag.php

@@ -0,0 +1,25 @@
+<?php
+namespace Misuzu\Parsers\BBCode\Tags;
+
+use Misuzu\Parsers\BBCode\BBCodeTag;
+
+final class LinkifyTag extends BBCodeTag
+{
+    public function parseText(string $text): string
+    {
+        return preg_replace_callback(
+            '/(^|[\n ])([\w]*?)([\w]*?:\/\/[\w]+[^ \,\"\n\r\t<]*)/is',
+            function ($matches) {
+                $matches[0] = trim($matches[0]);
+                $url = parse_url($matches[0]);
+
+                if (empty($url['scheme']) || !in_array(mb_strtolower($url['scheme']), ['http', 'https', 'ftp'], true)) {
+                    return $matches[0];
+                }
+
+                return sprintf('<a href="%1$s" class="link" target="_blank" rel="noreferrer noopener">%1$s</a>', $matches[0]);
+            },
+            $text
+        );
+    }
+}