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<?php |
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/** |
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* This file is part of Railt package. |
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* |
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* For the full copyright and license information, please view the LICENSE |
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* file that was distributed with this source code. |
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*/ |
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declare(strict_types=1); |
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namespace Railt\SDL\Frontend\Deferred; |
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use Railt\SDL\Frontend\Context\ContextInterface; |
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/** |
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* Class Deferred |
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*/ |
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class Deferred implements DeferredInterface |
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{ |
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/** |
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* @var \Closure[] |
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*/ |
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private $then = []; |
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/** |
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* @var ContextInterface |
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*/ |
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private $ctx; |
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/** |
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* @var int |
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*/ |
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private $offset = 0; |
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/** |
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* Deferred constructor. |
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* @param ContextInterface $ctx |
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* @param \Closure $then |
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*/ |
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public function __construct(ContextInterface $ctx, \Closure $then = null) |
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{ |
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$this->ctx = $ctx; |
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if ($then) { |
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$this->then($then); |
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} |
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} |
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/** |
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* @return int |
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*/ |
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public function getOffset(): int |
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{ |
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return $this->offset; |
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} |
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/** |
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* @param int $offset |
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* @return DeferredInterface |
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*/ |
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public function definedIn(int $offset): DeferredInterface |
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{ |
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$this->offset = $offset; |
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return $this; |
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} |
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/** |
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* @return ContextInterface |
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*/ |
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public function getContext(): ContextInterface |
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{ |
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return $this->ctx; |
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} |
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/** |
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* @param \Closure $then |
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* @return Deferred|$this |
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*/ |
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public function then(\Closure $then): DeferredInterface |
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{ |
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$this->then[] = $then; |
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return $this; |
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} |
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/** |
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* @param mixed $value |
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* @return \Generator|mixed|null |
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*/ |
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public function __invoke($value) |
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{ |
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return $this->invoke($value); |
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} |
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/** |
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* @param array $args |
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* @return \Generator|mixed |
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*/ |
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public function invoke(...$args): \Generator |
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{ |
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$result = $args[0] ?? null; |
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foreach ($this->then as $callback) { |
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yield from $output = $this->response($callback($this->ctx, ...$args)); |
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$args[0] = $result = $output->getReturn(); |
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} |
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return $result; |
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} |
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/** |
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* @param mixed $result |
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* @return \Generator |
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*/ |
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private function response($result): \Generator |
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{ |
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if ($result instanceof \Generator) { |
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yield from $result; |
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return $result->getReturn(); |
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} |
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return $result; |
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} |
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} |
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railt /
sdl
