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