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<?php declare(strict_types=1); |
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namespace Jasny\Container; |
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use Improved as i; |
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use Interop\Container\ContainerInterface as InteropContainer; |
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use Jasny\Container\Autowire\AutowireInterface; |
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use Psr\Container\ContainerInterface; |
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use Jasny\Container\Exception\NotFoundException; |
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use Jasny\Container\Exception\NoSubContainerException; |
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/** |
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* This class is a minimalist dependency injection container. |
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* It has compatibility with container-interop's ContainerInterface and delegate-lookup feature. |
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*/ |
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class Container implements InteropContainer, AutowireContainerInterface |
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{ |
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/** |
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* The delegate lookup. |
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* |
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* @var ContainerInterface |
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*/ |
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protected $delegateLookupContainer; |
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/** |
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* The array of closures defining each entry of the container. |
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* |
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* @var \Closure[] |
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*/ |
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protected $callbacks; |
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/** |
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* The array of entries once they have been instantiated. |
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* |
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* @var mixed[] |
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*/ |
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protected $instances = []; |
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/** |
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* Class constructor |
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* |
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* @param \Traversable<\Closure>|\Closure[] $entries Entries must be passed as an array of anonymous functions. |
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* @param ContainerInterface $delegateLookupContainer Optional delegate lookup container. |
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*/ |
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public function __construct(iterable $entries, ContainerInterface $delegateLookupContainer = null) |
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{ |
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$this->callbacks = is_array($entries) ? $entries : iterator_to_array($entries); |
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$this->delegateLookupContainer = $delegateLookupContainer ?: $this; |
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} |
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/** |
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* Get an instance from the container. |
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* |
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* @param string $identifier |
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* @return mixed |
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* @throws NotFoundException |
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* @throws NoSubContainerException |
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*/ |
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public function get($identifier) |
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{ |
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i\type_check($identifier, 'string'); |
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if (array_key_exists($identifier, $this->instances)) { |
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return $this->instances[$identifier]; |
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} |
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if (!isset($this->callbacks[$identifier])) { |
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return $this->getSub($identifier); |
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} |
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$instance = $this->callbacks[$identifier]($this->delegateLookupContainer); |
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$this->assertType($instance, $identifier); |
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$this->instances[$identifier] = $instance; |
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return $instance; |
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} |
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/** |
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* Check if the container has an entry. |
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* |
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* @param string $identifier |
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* @return bool |
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* @throws NotFoundException |
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* @throws NoSubContainerException |
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*/ |
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public function has($identifier): bool |
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{ |
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i\type_check($identifier, 'string'); |
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return isset($this->callbacks[$identifier]) || $this->hasSub($identifier); |
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} |
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/** |
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* Instantiate a new object, autowire dependencies. |
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* |
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* @param string $class |
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* @param mixed ...$args |
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* @return object |
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* @throws NotFoundException |
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* @throws NoSubContainerException |
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*/ |
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public function autowire(string $class, ...$args) |
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{ |
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return $this->get(AutowireInterface::class)->instantiate($class, ...$args); |
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} |
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/** |
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* Check the type of the instance if the identifier is an interface or class name. |
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* |
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* @param mixed $instance |
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* @param string $identifier |
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* @throws \TypeError |
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*/ |
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protected function assertType($instance, string $identifier): void |
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{ |
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if (ctype_upper($identifier[0]) && |
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strpos($identifier, '.') === false && |
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(class_exists($identifier) || interface_exists($identifier)) && |
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!is_a($instance, $identifier) |
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) { |
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$type = (is_object($instance) ? get_class($instance) . ' ' : '') . gettype($instance); |
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throw new \TypeError("Entry is a $type, which does not implement $identifier"); |
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} |
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} |
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/** |
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* Get an instance from a subcontainer. |
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* |
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* @param string $identifier |
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* @return mixed |
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* @throws NotFoundException |
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* @throws NoSubContainerException |
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*/ |
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protected function getSub(string $identifier) |
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{ |
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[$subcontainer, $containerId, $subId] = $this->findSubContainer($identifier); |
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if (!isset($subcontainer)) { |
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throw new NotFoundException("Entry \"$identifier\" is not defined."); |
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} |
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if (!$subcontainer instanceof ContainerInterface) { |
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throw new NoSubContainerException("Entry \"$containerId\" is not a PSR-11 compatible container"); |
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} |
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return $subcontainer->get($subId); |
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} |
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/** |
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* Get an instance from a subcontainer. |
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* |
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* @param string $identifier |
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* @return bool |
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* @throws NotFoundException |
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* @throws NoSubContainerException |
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*/ |
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protected function hasSub(string $identifier): bool |
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{ |
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[$subcontainer, , $subId] = $this->findSubContainer($identifier); |
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return isset($subcontainer) && $subcontainer instanceof ContainerInterface && $subcontainer->has($subId); |
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} |
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/** |
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* Find an subcontainer iterating through the identifier parts. |
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* |
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* @param string $identifier |
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* @return array [subcontainer, container id, subidentifier] |
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* @throws NotFoundException |
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* @throws NoSubContainerException |
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*/ |
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protected function findSubContainer(string $identifier): array |
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{ |
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$containerId = null; |
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$subcontainer = null; |
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$parts = explode('.', $identifier); |
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$subParts = []; |
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while ($parts !== []) { |
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array_unshift($subParts, array_pop($parts)); |
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$containerId = join('.', $parts); |
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if (isset($this->callbacks[$containerId])) { |
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$subcontainer = $this->get($containerId); |
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break; |
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} |
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} |
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return isset($subcontainer) ? [$subcontainer, $containerId, join('.', $subParts)] : [null, null, null]; |
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} |
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} |
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jasny /
container
