JavaScriptBindable.php

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<?php

declare(strict_types=1);

namespace ILIAS\UI\Implementation\Component;

use Closure;
use ReflectionFunction;
use InvalidArgumentException;

trait JavaScriptBindable
{
    private ?Closure $on_load_code_binder = null;

    public function withOnLoadCode(Closure $binder)
    {
        $this->checkBinder($binder);
        $clone = clone $this;
        $clone->on_load_code_binder = $binder;
        return $clone;
    }

    public function withAdditionalOnLoadCode(Closure $binder)
    {
        $current_binder = $this->getOnLoadCode();
        if ($current_binder === null) {
            return $this->withOnLoadCode($binder);
        }

        $this->checkBinder($binder);
        return $this->withOnLoadCode(fn ($id) => $current_binder($id) . "\n" . $binder($id));
    }

    public function getOnLoadCode(): ?Closure
    {
        return $this->on_load_code_binder;
    }

    private function checkBinder(Closure $binder): void
    {
        $refl = new ReflectionFunction($binder);
        $args = array_map(fn ($arg) => $arg->name, $refl->getParameters());
        if (array("id") !== $args) {
            throw new InvalidArgumentException('Expected closure "$binder" to have exactly one argument "$id".');
        }
    }
}