CheckClosureTrait.php

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<?php
 
declare(strict_types=1);
 
namespace ILIAS\GlobalScreen\Scope;
 
use Closure;
use LogicException;
use ReflectionFunction;
use ReflectionType;
use Throwable;
 
trait CheckClosureTrait
{
    private function checkClosureForSignature(Closure $c, string $signature): void
    {
        $error_message = 'first argument and return type of closure must be type-hinted to ' . $signature;
        try {
            $r = new ReflectionFunction($c);
            if (count($r->getParameters()) !== 1) {
                throw new LogicException($error_message);
            }
            $first_param_type = $r->getParameters()[0]->getType();
            if ($first_param_type instanceof ReflectionType && $first_param_type->getName() !== $signature) {
                throw new LogicException($error_message);
            }
            $return_type = $r->getReturnType();
            if ($return_type === null) {
                throw new LogicException($error_message);
            }
            if ($return_type->getName() !== $signature) {
                throw new LogicException($error_message);
            }
        } catch (Throwable) {
            throw new LogicException($error_message);
        }
    }
}