中间件的参数解析过程

在配置中间件的时候需要配置一些参数，比如 throttle:api，throttle:60,1 在Lavarel 中到底是怎么解析的呢？
主要的解析功能是在 Router 类中的方法：

protected function runRouteWithinStack(Route $route, Request $request)
    {
        $shouldSkipMiddleware = $this->container->bound('middleware.disable') &&
                                $this->container->make('middleware.disable') === true;

        $middleware = $shouldSkipMiddleware ? [] : $this->gatherRouteMiddleware($route);

        return (new Pipeline($this->container))
                        ->send($request)
                        ->through($middleware)
                        ->then(function ($request) use ($route) {
                            return $this->prepareResponse(
                                $request, $route->run()
                            );
                        });
    }

PipeLine 的 through 方法中。

通过 gatherRouteMiddleware 方法获取中间件的类

/**
     * Gather the middleware for the given route with resolved class names.
     *
     * @param  \Illuminate\Routing\Route  $route
     * @return array
     */
    public function gatherRouteMiddleware(Route $route)
    {
        $excluded = collect($route->excludedMiddleware())->map(function ($name) {
            return (array) MiddlewareNameResolver::resolve($name, $this->middleware, $this->middlewareGroups);
        })->flatten()->values()->all();

        $middleware = collect($route->gatherMiddleware())->map(function ($name) {
            return (array) MiddlewareNameResolver::resolve($name, $this->middleware, $this->middlewareGroups);
        })->flatten()->reject(function ($name) use ($excluded) {
            return in_array($name, $excluded, true);
        })->values();

        return $this->sortMiddleware($middleware);
    }

在通过 PipeLine 的方法解析类并传入中间件参数

/**
     * Get a Closure that represents a slice of the application onion.
     *
     * @return \Closure
     */
    protected function carry()
    {
        return function ($stack, $pipe) {
            return function ($passable) use ($stack, $pipe) {
                try {
                    if (is_callable($pipe)) {
                        // If the pipe is a callable, then we will call it directly, but otherwise we
                        // will resolve the pipes out of the dependency container and call it with
                        // the appropriate method and arguments, returning the results back out.
                        return $pipe($passable, $stack);
                    } elseif (! is_object($pipe)) {
                        [$name, $parameters] = $this->parsePipeString($pipe);

                        // If the pipe is a string we will parse the string and resolve the class out
                        // of the dependency injection container. We can then build a callable and
                        // execute the pipe function giving in the parameters that are required.
                        $pipe = $this->getContainer()->make($name);

                        $parameters = array_merge([$passable, $stack], $parameters);
                    } else {
                        // If the pipe is already an object we'll just make a callable and pass it to
                        // the pipe as-is. There is no need to do any extra parsing and formatting
                        // since the object we're given was already a fully instantiated object.
                        $parameters = [$passable, $stack];
                    }

                    $carry = method_exists($pipe, $this->method)
                                    ? $pipe->{$this->method}(...$parameters)
                                    : $pipe(...$parameters);

                    return $this->handleCarry($carry);
                } catch (Throwable $e) {
                    return $this->handleException($passable, $e);
                }
            };
        };
    }