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<?php |
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declare(strict_types=1); |
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namespace Shoot\Shoot; |
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use Psr\Http\Message\ServerRequestInterface; |
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/** |
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* The processing pipeline of Shoot. Holds the middleware that enables Shoot's functionality. It's called from the Twig |
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* extension. |
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*/ |
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final class Pipeline |
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{ |
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/** @var callable */ |
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private $middleware; |
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/** @var ServerRequestInterface|null */ |
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private $request; |
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/** |
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* Constructs an instance of Pipeline. Takes the middleware that enables Shoot's functionality. Middleware is |
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* executed in the same order as given. |
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* |
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* @param MiddlewareInterface[] $middleware |
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*/ |
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public function __construct(array $middleware = []) |
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{ |
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$this->middleware = $this->chainMiddleware($middleware); |
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} |
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/** |
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* Sets the HTTP request context while executing the given callback. Any templates should be rendered within this |
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* callback. Returns the result returned by the callback (if any). |
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* |
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* @param ServerRequestInterface $request |
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* @param callable $callback |
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* |
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* @return mixed |
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*/ |
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public function withRequest(ServerRequestInterface $request, callable $callback) |
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{ |
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try { |
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$this->request = $request; |
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return $callback(); |
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} finally { |
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$this->request = null; |
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} |
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} |
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/** |
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* @param View $view |
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* |
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* @return void |
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* |
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* @internal |
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*/ |
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public function process(View $view): void |
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{ |
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if ($this->request === null) { |
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throw new MissingRequestException('Cannot process a view without a request set. This method should be called from the callback passed to Pipeline::withRequest'); |
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} |
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call_user_func($this->middleware, $view); |
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} |
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/** |
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* @param MiddlewareInterface[] $middleware |
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* |
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* @return callable |
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*/ |
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private function chainMiddleware(array $middleware): callable |
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{ |
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$middleware = array_reverse($middleware); |
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return array_reduce($middleware, function (callable $next, MiddlewareInterface $middleware): callable { |
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return function (View $view) use ($middleware, $next): View { |
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return $middleware->process($view, $this->request, $next); |
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}; |
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}, function (View $view): View { |
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$view->render(); |
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return $view; |
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}); |
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} |
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} |
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shootphp /
shoot
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