StandaloneTraverseNodeTraverser: create NodeTraversers just once

src/NodeTraverser/StandaloneTraverseNodeTraverser.php

@@ -3,6 +3,8 @@
 namespace Rector\NodeTraverser;
 
 use PhpParser\Node;
+use PhpParser\NodeTraverser;
+use PhpParser\NodeTraverserInterface;
 use PhpParser\NodeVisitor;
 
 /**
@@ -21,6 +23,11 @@ final class StandaloneTraverseNodeTraverser
      */
     private $nodeTraverserFactory;
 
+    /**
+     * @var NodeTraverserInterface[]
+     */
+    private $nodeTraversers;
+
     public function __construct(NodeTraverserFactory $nodeTraverserFactory)
     {
         $this->nodeTraverserFactory = $nodeTraverserFactory;
@@ -37,11 +44,26 @@ final class StandaloneTraverseNodeTraverser
      */
     public function traverse(array $nodes): array
     {
-        foreach ($this->nodeVisitors as $nodeVisitor) {
+        foreach ($this->getNodeTraversers() as $nodeTraverser) {
-            $nodeTraverser = $this->nodeTraverserFactory->createWithNodeVisitor($nodeVisitor);
             $nodes = $nodeTraverser->traverse($nodes);
         }
 
         return $nodes;
     }
+
+    /**
+     * @return NodeTraverserInterface[]
+     */
+    private function getNodeTraversers(): array
+    {
+        if ($this->nodeTraversers) {
+            return $this->nodeTraversers;
+        }
+
+        foreach ($this->nodeVisitors as $nodeVisitor) {
+            $this->nodeTraversers[] = $this->nodeTraverserFactory->createWithNodeVisitor($nodeVisitor);
+        }
+
+        return $this->nodeTraversers;
+    }
 }