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<?php |
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declare(strict_types=1); |
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namespace Improved\IteratorPipeline; |
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use Improved as i; |
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use Improved\Iterator\CombineIterator; |
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use Improved\IteratorPipeline\PipelineBuilder\Stub; |
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use Improved\IteratorPipeline\Traits\FilteringTrait; |
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use Improved\IteratorPipeline\Traits\MappingTrait; |
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use Improved\IteratorPipeline\Traits\SortingTrait; |
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/** |
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* The `PipelineBuilder` can be used to create a blueprint for pipelines. |
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*/ |
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class PipelineBuilder |
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{ |
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use MappingTrait; |
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use FilteringTrait; |
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use SortingTrait; |
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/** |
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* @var array |
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*/ |
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protected $steps = []; |
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/** |
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* Define the next step via a callback that returns an array or Traversable object. |
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* |
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* @param callable $callback |
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* @param mixed ...$args |
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* @return static |
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*/ |
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public function then(callable $callback, ...$args): self |
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{ |
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$copy = clone $this; |
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if ($callback instanceof self) { |
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$copy->steps = array_merge($this->steps, $callback->steps); |
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} else { |
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$copy->steps[] = [$callback, $args]; |
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} |
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return $copy; |
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} |
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/** |
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* Add a stub, which does nothing but can be replaced later. |
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* |
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* @param string $name |
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* @return static |
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* @throw \BadMethodCallException if stub already exists |
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*/ |
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public function stub(string $name): self |
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{ |
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$hasStub = i\iterable_has_any($this->steps, function($step) use ($name) { |
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return $step[0] instanceof Stub && $step[0]->getName() === $name; |
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}); |
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if ($hasStub) { |
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throw new \BadMethodCallException("Pipeline builder already has '$name' stub"); |
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} |
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return $this->then(new Stub($name)); |
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} |
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/** |
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* Get a pipeline builder where a stub is replaced. |
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* |
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* @param string $name |
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* @param callable $callable |
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* @param mixed ...$args |
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* @return static |
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*/ |
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public function unstub(string $name, callable $callable, ...$args): self |
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{ |
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$index = i\iterable_find_key($this->steps, function($step) use ($name) { |
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return $step[0] instanceof Stub && $step[0]->getName() === $name; |
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}); |
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if ($index === null) { |
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throw new \BadMethodCallException("Pipeline builder doesn't have '$name' stub"); |
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} |
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$clone = clone $this; |
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$clone->steps[$index] = [$callable, $args]; |
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return $clone; |
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} |
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/** |
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* Create a new pipeline |
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* |
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* @param iterable $iterable |
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* @return Pipeline |
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*/ |
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public function with(iterable $iterable): Pipeline |
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{ |
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$pipeline = new Pipeline($iterable); |
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foreach ($this->steps as [$callback, $args]) { |
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$pipeline->then($callback, ...$args); |
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} |
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return $pipeline; |
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} |
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/** |
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* Invoke the builder. |
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* |
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* @param iterable $iterable |
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* @return array |
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*/ |
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public function __invoke(iterable $iterable): array |
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{ |
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return $this->with($iterable)->toArray(); |
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} |
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/** |
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* Use another iterator as keys and the current iterator as values. |
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* |
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* @param iterable $keys Keys will be turned into an array. |
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* @return static |
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*/ |
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public function setKeys(iterable $keys) |
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{ |
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$combine = function ($values, $keys) { |
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return new CombineIterator($keys, $values); |
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}; |
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return $this->then($combine, i\iterable_to_array($keys)); |
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} |
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} |
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jasny /
improved-php-iterable
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