add URN parser

src/Urn.php

@@ -0,0 +1,39 @@
+<?php
+
+namespace YGGverse\Parser;
+
+class Urn {
+
+  public static function is(string $urn) : bool
+  {
+    return ('urn' == parse_url($urn, PHP_URL_SCHEME));
+  }
+
+  public static function parse(string $urn) : mixed
+  {
+    if (!self::is($urn))
+    {
+      return false;
+    }
+
+    if ($part = explode(':', $urn))
+    {
+      if (empty($part[0]) || empty($part[1]) || empty($part[2]))
+      {
+        return false;
+      }
+
+      unset($part[0]);
+
+      $result =
+      [
+        'urn'   => implode(':', $part),
+        'parts' => $part,
+      ];
+
+      return (object) $result;
+    }
+
+    return false;
+  }
+}