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<?php |
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namespace Northwoods\Container\Config; |
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use Auryn\Injector; |
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use Northwoods\Container\InjectorConfig; |
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use Psr\Container\ContainerInterface; |
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class ServiceConfig implements InjectorConfig |
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{ |
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/** |
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* @var array |
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*/ |
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private $config; |
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public function __construct(array $config) |
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{ |
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$this->config = $config; |
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} |
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/** |
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* @param Injector $injector |
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* @return void |
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*/ |
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public function apply(Injector $injector) |
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{ |
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// Aliases are exactly the same as aliases. Natch. |
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if (isset($this->config['aliases'])) { |
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$this->applyAliases($injector, $this->config['aliases']); |
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} |
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if (isset($this->config['delegators'])) { |
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// Delegators are effectively a chain of prepare() statements. |
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$this->applyDelegators($injector, $this->config['delegators']); |
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} |
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// Factories are exactly the same thing as a delegate. |
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if (isset($this->config['factories'])) { |
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$this->applyDelegates($injector, $this->config['factories']); |
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} |
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// Invokables are references to classes that have no constructor parameters. |
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// This means nothing in Auryn so we just alias the reference. |
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if (isset($this->config['invokables'])) { |
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$this->applyAliases($injector, $this->config['invokables']); |
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} |
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// Services are already constructed instances of something. To handle this, |
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// we simply wrap the instance in a callable that returns the instance. |
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if (isset($this->config['services'])) { |
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$this->applyDelegates($injector, $this->kAll($this->config['services'])); |
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} |
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} |
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/** |
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* @param array $services |
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* @return void |
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*/ |
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private function applyAliases(Injector $injector, array $services) |
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{ |
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foreach ($services as $name => $object) { |
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$injector->alias($name, $object); |
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} |
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} |
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/** |
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* @param array $services |
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* @return void |
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*/ |
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private function applyDelegates(Injector $injector, array $services) |
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{ |
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foreach ($services as $name => $object) { |
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$injector->delegate($name, $object); |
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} |
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} |
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/** |
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* @param array $delegators |
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* @return void |
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*/ |
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private function applyDelegators(Injector $injector, array $delegators) |
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{ |
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// https://github.com/rdlowrey/auryn#prepares-and-setter-injection |
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foreach ($delegators as $service => $prepares) { |
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$injector->prepare($service, $this->createDelegator($service, $prepares)); |
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} |
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} |
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/** |
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* Create a chained prepare() |
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* |
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* @param string $service |
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* @param string[] $delegators |
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* @return callable |
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*/ |
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private function createDelegator($service, array $delegators) |
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{ |
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// Prepare the service by calling each delegator with the result of the previous. |
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return function ($instance, $injector) use ($service, $delegators) { |
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return array_reduce($delegators, $this->delegatorReducer($injector, $service), $instance); |
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}; |
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} |
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/** |
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* Create a reducer for a chained prepare() |
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* |
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* @param string $service |
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* @return callable |
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*/ |
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private function delegatorReducer(Injector $injector, $service) |
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{ |
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// https://docs.zendframework.com/zend-expressive/features/container/delegator-factories/ |
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return function ($instance, $delegator) use ($injector, $service) { |
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if (!is_callable($delegator)) { |
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$delegator = $injector->make($delegator); |
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} |
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$callable = $this->k($instance); |
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return $injector->execute($this->curryDelegator($delegator, $service, $callable)); |
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}; |
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} |
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/** |
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* Curry the delegator to only require a container |
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* |
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* @param callable $delegator that will be ultimately called |
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* @param string $service name of service being prepared |
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* @param callable $callable that returns the instance |
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* @return callable |
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*/ |
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private function curryDelegator(callable $delegator, $service, callable $callable) |
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{ |
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return static function (ContainerInterface $container) use ($delegator, $service, $callable) { |
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return $delegator($container, $service, $callable); |
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}; |
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} |
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/** |
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* Returns a function that always returns the same value |
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* |
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* Also known as a "kestrel" or "k combinator". |
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* |
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* @param mixed $x |
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* @return callable |
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*/ |
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private function k($x) |
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{ |
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return static function () use ($x) { |
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return $x; |
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}; |
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} |
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/** |
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* @param array $values |
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* @return callable[] |
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*/ |
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private function kAll(array $values) |
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{ |
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return array_map( |
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function ($x) { |
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return $this->k($x); |
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}, |
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$values |
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); |
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} |
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} |
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northwoods /
container
