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<?php |
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/** |
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* This file is part of phuria/pipolino package. |
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* |
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* Copyright (c) 2017 Beniamin Jonatan Šimko |
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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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namespace Phuria\Pipolino; |
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/** |
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* @author Beniamin Jonatan Šimko <[email protected]> |
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*/ |
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class Pipolino |
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{ |
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/** |
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* @var array |
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*/ |
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private $stages; |
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/** |
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* @var callable |
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*/ |
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private $defaultStage; |
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/** |
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* @param array $stages |
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* @param callable $defaultStage |
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* |
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* @throws InvalidStageException |
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*/ |
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public function __construct(array $stages = [], callable $defaultStage = null) |
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{ |
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foreach ($stages as $stage) { |
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if (false === is_callable($stage)) { |
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throw InvalidStageException::create($stage); |
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} |
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} |
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$this->stages = $stages; |
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$this->defaultStage = $defaultStage ?: new DefaultStage(); |
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} |
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/** |
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* @param callable $next |
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* @param array ...$args |
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* |
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* @return mixed |
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*/ |
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public function __invoke(callable $next, ...$args) |
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{ |
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return $this->process(...$args); |
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} |
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/** |
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* @param array ...$args |
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* |
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* @return mixed |
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*/ |
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public function process(...$args) |
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{ |
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if (0 === count($this->stages)) { |
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return call_user_func($this->defaultStage, ...$args); |
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} |
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$stages = $this->stages; |
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$currentStage = array_shift($stages); |
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$next = function (...$args) use ($stages) { |
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return (new Pipolino($stages, $this->defaultStage))->process(...$args); |
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}; |
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return call_user_func($currentStage, $next, ...$args); |
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} |
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/** |
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* @param callable $stage |
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* |
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* @return Pipolino |
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*/ |
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public function addStage(callable $stage) |
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{ |
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$stages = $this->stages; |
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$stages[] = $stage; |
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return new self($stages, $this->defaultStage); |
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} |
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/** |
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* @param callable $stage |
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* |
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* @return Pipolino |
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*/ |
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public function withDefaultStage(callable $stage) |
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{ |
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return new self($this->stages, $stage); |
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} |
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} |
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phuria /
pipolino
