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<?php |
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/** |
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* Slim Framework (https://slimframework.com) |
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* |
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* @license https://github.com/slimphp/Slim/blob/3.x/LICENSE.md (MIT License) |
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*/ |
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namespace Slim; |
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use Psr\Container\ContainerInterface; |
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use RuntimeException; |
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use Slim\Interfaces\CallableResolverInterface; |
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/** |
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* This class resolves a string of the format 'class:method' into a closure |
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* that can be dispatched. |
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*/ |
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final class CallableResolver implements CallableResolverInterface |
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{ |
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const CALLABLE_PATTERN = '!^([^\:]+)\:([a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*)$!'; |
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/** |
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* @var ContainerInterface |
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*/ |
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private $container; |
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/** |
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* @param ContainerInterface $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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* Resolve toResolve into a closure so that the router can dispatch. |
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* |
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* If toResolve is of the format 'class:method', then try to extract 'class' |
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* from the container otherwise instantiate it and then dispatch 'method'. |
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* |
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* @param callable|string $toResolve |
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* |
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* @return callable |
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* |
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* @throws RuntimeException If the callable does not exist |
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* @throws RuntimeException If the callable is not resolvable |
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*/ |
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public function resolve($toResolve) |
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{ |
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if (is_callable($toResolve)) { |
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return $toResolve; |
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} |
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if (!is_string($toResolve)) { |
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$this->assertCallable($toResolve); |
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} |
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list($class, $method) = $this->parseCallable($toResolve); |
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$resolved = $this->resolveCallable($class, $method); |
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$this->assertCallable($resolved); |
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return $resolved; |
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} |
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/** |
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* Extract class and method from toResolve |
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* |
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* @param string $toResolve |
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* |
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* @return array |
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*/ |
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protected function parseCallable($toResolve) |
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{ |
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if (preg_match(self::CALLABLE_PATTERN, $toResolve, $matches)) { |
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return [$matches[1], $matches[2]]; |
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} |
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return [$toResolve, '__invoke']; |
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} |
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/** |
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* Check if string is something in the DIC |
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* that's callable or is a class name which has an __invoke() method. |
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* |
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* @param string $class |
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* @param string $method |
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* |
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* @return callable |
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* |
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* @throws RuntimeException if the callable does not exist |
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*/ |
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protected function resolveCallable($class, $method) |
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{ |
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if ($this->container->has($class)) { |
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return [$this->container->get($class), $method]; |
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} |
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if (!class_exists($class)) { |
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throw new RuntimeException(sprintf('Callable %s does not exist', $class)); |
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} |
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return [new $class($this->container), $method]; |
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} |
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/** |
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* @param Callable $callable |
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* |
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* @throws RuntimeException if the callable is not resolvable |
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*/ |
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protected function assertCallable($callable) |
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{ |
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if (!is_callable($callable)) { |
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throw new RuntimeException(sprintf( |
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'%s is not resolvable', |
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is_array($callable) || is_object($callable) ? json_encode($callable) : $callable |
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)); |
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} |
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} |
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} |
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slimphp /
Slim
