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<?php declare(strict_types=1); |
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|
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namespace Invoker; |
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|
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use Closure; |
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use Invoker\Exception\NotCallableException; |
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use Psr\Container\ContainerInterface; |
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use Psr\Container\NotFoundExceptionInterface; |
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use ReflectionException; |
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use ReflectionMethod; |
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|
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/** |
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* Resolves a callable from a container. |
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*/ |
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class CallableResolver |
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{ |
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/** @var ContainerInterface */ |
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private $container; |
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|
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public function __construct(ContainerInterface $container) |
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{ |
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$this->container = $container; |
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} |
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|
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/** |
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* Resolve the given callable into a real PHP callable. |
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* |
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* @param callable|string|array $callable |
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* @return callable Real PHP callable. |
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* @throws NotCallableException|ReflectionException |
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*/ |
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public function resolve($callable): callable |
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{ |
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if (is_string($callable) && strpos($callable, '::') !== false) { |
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$callable = explode('::', $callable, 2); |
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} |
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|
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$callable = $this->resolveFromContainer($callable); |
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|
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if (! is_callable($callable)) { |
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throw NotCallableException::fromInvalidCallable($callable, true); |
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} |
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|
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return $callable; |
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} |
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|
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/** |
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* @param callable|string|array $callable |
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* @return callable|mixed |
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* @throws NotCallableException|ReflectionException |
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*/ |
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private function resolveFromContainer($callable) |
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{ |
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// Shortcut for a very common use case |
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if ($callable instanceof Closure) { |
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return $callable; |
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} |
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|
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// If it's already a callable there is nothing to do |
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if (is_callable($callable)) { |
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// TODO with PHP 8 that should not be necessary to check this anymore |
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if (! $this->isStaticCallToNonStaticMethod($callable)) { |
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return $callable; |
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} |
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} |
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|
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// The callable is a container entry name |
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if (is_string($callable)) { |
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try { |
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return $this->container->get($callable); |
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} catch (NotFoundExceptionInterface $e) { |
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if ($this->container->has($callable)) { |
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throw $e; |
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} |
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throw NotCallableException::fromInvalidCallable($callable, true); |
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} |
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} |
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|
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// The callable is an array whose first item is a container entry name |
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// e.g. ['some-container-entry', 'methodToCall'] |
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if (is_array($callable) && is_string($callable[0])) { |
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try { |
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// Replace the container entry name by the actual object |
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$callable[0] = $this->container->get($callable[0]); |
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return $callable; |
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} catch (NotFoundExceptionInterface $e) { |
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if ($this->container->has($callable[0])) { |
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throw $e; |
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} |
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throw new NotCallableException(sprintf( |
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'Cannot call %s() on %s because it is not a class nor a valid container entry', |
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$callable[1], |
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$callable[0] |
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)); |
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} |
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} |
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|
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// Unrecognized stuff, we let it fail later |
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return $callable; |
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} |
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|
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/** |
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* Check if the callable represents a static call to a non-static method. |
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* |
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* @param mixed $callable |
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* @throws ReflectionException |
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*/ |
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private function isStaticCallToNonStaticMethod($callable): bool |
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{ |
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if (is_array($callable) && is_string($callable[0])) { |
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[$class, $method] = $callable; |
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|
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if (! method_exists($class, $method)) { |
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return false; |
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} |
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|
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$reflection = new ReflectionMethod($class, $method); |
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|
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return ! $reflection->isStatic(); |
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} |
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|
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return false; |
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} |
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} |
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|
