add system to (de)normalize messages

src/Message.php

@@ -4,16 +4,11 @@
 namespace Innmind\Witness;
 
 use Innmind\Witness\Message\Payload;
-use Innmind\Immutable\Maybe;
 
 /**
  * @psalm-immutable
  */
 interface Message
 {
-    /**
-     * @return Maybe<self>
-     */
-    public static function denormalize(Payload $payload): Maybe;
     public function normalize(): Payload;
 }

src/Messages.php

@@ -0,0 +1,48 @@
+<?php
+declare(strict_types = 1);
+
+namespace Innmind\Witness;
+
+use Innmind\Witness\Message\Payload;
+use Innmind\Immutable\Maybe;
+
+final class Messages
+{
+    private function __construct(
+        /** @var list<callable(Payload): Maybe<Message>> */
+        private array $denormalizers,
+    ) {
+    }
+
+    /**
+     * @no-named-arguments
+     *
+     * @param callable(Payload): Maybe<Message> $denormalizers
+     */
+    public static function of(callable ...$denormalizers): self
+    {
+        return new self($denormalizers);
+    }
+
+    public function normalize(Message $message): Payload
+    {
+        return $message->normalize();
+    }
+
+    public function denormalize(Payload $payload): Message
+    {
+        /** @var Maybe<Message> */
+        $message = Maybe::nothing();
+
+        foreach ($this->denormalizers as $denormalize) {
+            $message = $message->otherwise(
+                static fn() => $denormalize($payload),
+            );
+        }
+
+        return $message->match(
+            static fn($message) => $message,
+            static fn() => throw new \LogicException('Unable to denormalize a message payload'),
+        );
+    }
+}