update

projects/priceservice/vendor/symfony/messenger/Middleware/StackMiddleware.php

@@ -0,0 +1,90 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\Messenger\Middleware;
+
+use Symfony\Component\Messenger\Envelope;
+
+/**
+ * @author Nicolas Grekas <p@tchwork.com>
+ */
+class StackMiddleware implements MiddlewareInterface, StackInterface
+{
+    private MiddlewareStack $stack;
+    private int $offset = 0;
+
+    /**
+     * @param iterable<mixed, MiddlewareInterface>|MiddlewareInterface|null $middlewareIterator
+     */
+    public function __construct(iterable|MiddlewareInterface|null $middlewareIterator = null)
+    {
+        $this->stack = new MiddlewareStack();
+
+        if (null === $middlewareIterator) {
+            return;
+        }
+
+        if ($middlewareIterator instanceof \Iterator) {
+            $this->stack->iterator = $middlewareIterator;
+        } elseif ($middlewareIterator instanceof MiddlewareInterface) {
+            $this->stack->stack[] = $middlewareIterator;
+        } else {
+            $this->stack->iterator = (function () use ($middlewareIterator) {
+                yield from $middlewareIterator;
+            })();
+        }
+    }
+
+    public function next(): MiddlewareInterface
+    {
+        if (null === $next = $this->stack->next($this->offset)) {
+            return $this;
+        }
+
+        ++$this->offset;
+
+        return $next;
+    }
+
+    public function handle(Envelope $envelope, StackInterface $stack): Envelope
+    {
+        return $envelope;
+    }
+}
+
+/**
+ * @internal
+ */
+class MiddlewareStack
+{
+    /** @var \Iterator<mixed, MiddlewareInterface>|null */
+    public ?\Iterator $iterator = null;
+    public array $stack = [];
+
+    public function next(int $offset): ?MiddlewareInterface
+    {
+        if (isset($this->stack[$offset])) {
+            return $this->stack[$offset];
+        }
+
+        if (null === $this->iterator) {
+            return null;
+        }
+
+        $this->iterator->next();
+
+        if (!$this->iterator->valid()) {
+            return $this->iterator = null;
+        }
+
+        return $this->stack[] = $this->iterator->current();
+    }
+}