WhenValidator.php

<?php


/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier <fabien@symfony.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */
namespace Symfony\Component\Validator\Constraints;

use Symfony\Component\ExpressionLanguage\ExpressionLanguage;
use Symfony\Component\Validator\Constraint;
use Symfony\Component\Validator\ConstraintValidator;
use Symfony\Component\Validator\Exception\LogicException;
use Symfony\Component\Validator\Exception\UnexpectedTypeException;
final class WhenValidator extends ConstraintValidator {
    public function __construct(?ExpressionLanguage $expressionLanguage = null) {
    }
    public function validate(mixed $value, Constraint $constraint) : void {
        if (!$constraint instanceof When) {
            throw new UnexpectedTypeException($constraint, When::class);
        }
        $context = $this->context;
        $variables = $constraint->values;
        $variables['value'] = $value;
        $variables['this'] = $context->getObject();
        $variables['context'] = $context;
        if ($this->getExpressionLanguage()
            ->evaluate($constraint->expression, $variables)) {
            $context->getValidator()
                ->inContext($context)
                ->validate($value, $constraint->constraints);
        }
    }
    private function getExpressionLanguage() : ExpressionLanguage {
        if (!class_exists(ExpressionLanguage::class)) {
            throw new LogicException(\sprintf('The "symfony/expression-language" component is required to use the "%s" validator. Try running "composer require symfony/expression-language".', __CLASS__));
        }
        return $this->expressionLanguage ??= new ExpressionLanguage();
    }

}