add pipeline feature for middleware

src/ZM/Middleware/Pipeline.php

@@ -0,0 +1,60 @@
+<?php
+
+declare(strict_types=1);
+
+namespace ZM\Middleware;
+
+use ZM\Exception\InvalidArgumentException;
+
+/**
+ * Pipeline Inspired by Laravel Framework
+ */
+class Pipeline
+{
+    /** @var mixed */
+    private $value;
+
+    /** @var array */
+    private $middlewares;
+
+    /**
+     * 向管道发送数据
+     *
+     * @param  mixed $value 数据
+     * @return $this
+     */
+    public function send($value): Pipeline
+    {
+        $this->value = $value;
+        return $this;
+    }
+
+    /**
+     * 指定要过的中间件列表
+     *
+     * @param  array $middlewares 要过的中间件（或者叫兼容管道的中间件也行）列表
+     * @return $this
+     */
+    public function through(array $middlewares): Pipeline
+    {
+        $this->middlewares = $middlewares;
+        return $this;
+    }
+
+    /**
+     * 接下来要调用的内容
+     *
+     * @param  callable                 $callback 然后调用一个什么东西
+     * @throws InvalidArgumentException
+     * @return null|mixed               返回调用结果或null
+     */
+    public function then(callable $callback)
+    {
+        $stack_id = middleware()->getStackId($callback);
+
+        // 遍历执行before并压栈，并在遇到返回false后停止
+        $final_result = (middleware()->getPipeClosure($callback, $stack_id))($this->middlewares, $this->value);
+
+        return $final_result ?? null;
+    }
+}