1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 <?php
/**
* Slim Framework (https://slimframework.com)
*
* @link https://github.com/slimphp/Slim
* @copyright Copyright (c) 2011-2017 Josh Lockhart
* @license https://github.com/slimphp/Slim/blob/3.x/LICENSE.md (MIT License)
*/
namespace Slim;
use RuntimeException;
use Psr\Container\ContainerInterface;
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 mixed $toResolve
*
* @return callable
*
* @throws RuntimeException if the callable does not exist
* @throws RuntimeException if the callable is not resolvable
*/
public function resolve($toResolve)
{
if (is_callable($toResolve)) {
return $toResolve;
}
if (!is_string($toResolve)) {
$this->assertCallable($toResolve);
}
// check for slim callable as "class:method"
if (preg_match(self::CALLABLE_PATTERN, $toResolve, $matches)) {
$resolved = $this->resolveCallable($matches[1], $matches[2]);
$this->assertCallable($resolved);
return $resolved;
}
$resolved = $this->resolveCallable($toResolve);
$this->assertCallable($resolved);
return $resolved;
}
/**
* 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, $method = '__invoke')
{
if ($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
));
}
}
}