/
Pipeline.php
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/
Pipeline.php
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<?php
namespace Buttress\Pipeline;
use \Buttress\Atlas\Pipeline\PipelineMap;
class Pipeline implements PipelineMap
{
/**
* @var array The parameters to pass through
*/
protected $parameters = [];
/**
* @var \Closure[] The list of pipes that the parameters will fall through
* Pipe should match function($parameter..., \Closure $next) {}
*/
protected $pipes = [];
/**
* @type \Closure The "then" closure, it will receive the parameters you pipe through
*/
protected $thenClosure;
/**
* @inheritdoc
*/
public function send(...$parameters) : PipelineMap
{
$this->parameters = $parameters;
return $this;
}
/**
* @inheritdoc
*/
public function through($pipes) : PipelineMap
{
$this->pipes = is_array($pipes) ? $pipes : func_get_args();
return $this;
}
/**
* @inheritdoc
*/
public function then(callable $then) : PipelineMap
{
$this->thenClosure = $then;
return $this;
}
/**
* @inheritdoc
*/
public function execute()
{
$pipes = array_reverse($this->pipes);
/** @type \Closure $linked_closure */
$linked_closure = array_reduce($pipes, $this->getIterator(), $this->getInitial($this->thenClosure));
return $linked_closure(...$this->parameters);
}
/**
* Get the iterator closure, this wraps every item in the list and injects the
* @return \Closure
*/
protected function getIterator() : \Closure
{
return function ($next, $pipe) {
return function (...$parameters) use ($next, $pipe) {
$parameters[] = $next;
return $pipe(...$parameters);
};
};
}
/**
* The initial closure
* @return \Closure
*/
protected function getInitial(\Closure $then) : \Closure
{
return function(...$parameters) use ($then) {
return $then(...$parameters);
};
}
}