✨ Add many visitor

Sometimes you need multiple visitors.

$visitor = new VisitorMany(
    array(
        new VisitorX(),
        new VisitorY(),
    )
);

$traverser = new Traverser($visitor);

src/Query/VisitorMany.php

@@ -0,0 +1,44 @@
+<?php
+
+namespace HansOtt\GraphQL\Query;
+
+final class VisitorMany implements Visitor
+{
+    private $visitors;
+
+    /**
+     * @param Visitor[] $visitors
+     */
+    public function __construct(array $visitors)
+    {
+        $this->visitors = $visitors;
+    }
+
+    public function beforeTraverse(Document $document)
+    {
+        foreach ($this->visitors as $visitor) {
+            $visitor->beforeTraverse($document);
+        }
+    }
+
+    public function enterNode(Node $node)
+    {
+        foreach ($this->visitors as $visitor) {
+            $visitor->enterNode($node);
+        }
+    }
+
+    public function leaveNode(Node $node)
+    {
+        foreach ($this->visitors as $visitor) {
+            $visitor->leaveNode($node);
+        }
+    }
+
+    public function afterTraverse(Document $document)
+    {
+        foreach ($this->visitors as $visitor) {
+            $visitor->afterTraverse($document);
+        }
+    }
+}