RouteGroup.php

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<?php
namespace Slim;

use Closure;
use Slim\Interfaces\RouteGroupInterface;

class RouteGroup extends Routable implements RouteGroupInterface
{
    public function __construct($pattern, $callable)
    {
        $this->pattern = $pattern;
        $this->callable = $callable;
    }

    public function __invoke(App $app = null)
    {
        $callable = $this->resolveCallable($this->callable);
        if ($callable instanceof Closure && $app !== null) {
            $callable = $callable->bindTo($app);
        }

        $callable($app);
    }
}