www.aleph1.co.uk Git - yaffs-website/blob - vendor/symfony/validator/Constraints/ExpressionValidator.php

   1 <?php
   2
   3 /*
   4  * This file is part of the Symfony package.
   5  *
   6  * (c) Fabien Potencier <fabien@symfony.com>
   7  *
   8  * For the full copyright and license information, please view the LICENSE
   9  * file that was distributed with this source code.
  10  */
  11
  12 namespace Symfony\Component\Validator\Constraints;
  13
  14 use Symfony\Component\ExpressionLanguage\ExpressionLanguage;
  15 use Symfony\Component\Validator\Constraint;
  16 use Symfony\Component\Validator\ConstraintValidator;
  17 use Symfony\Component\Validator\Exception\RuntimeException;
  18 use Symfony\Component\Validator\Exception\UnexpectedTypeException;
  19
  20 /**
  21  * @author Fabien Potencier <fabien@symfony.com>
  22  * @author Bernhard Schussek <bschussek@symfony.com>
  23  */
  24 class ExpressionValidator extends ConstraintValidator
  25 {
  26     /**
  27      * @var ExpressionLanguage
  28      */
  29     private $expressionLanguage;
  30
  31     public function __construct($propertyAccessor = null, ExpressionLanguage $expressionLanguage = null)
  32     {
  33         $this->expressionLanguage = $expressionLanguage;
  34     }
  35
  36     /**
  37      * {@inheritdoc}
  38      */
  39     public function validate($value, Constraint $constraint)
  40     {
  41         if (!$constraint instanceof Expression) {
  42             throw new UnexpectedTypeException($constraint, __NAMESPACE__.'\Expression');
  43         }
  44
  45         $variables = array();
  46         $variables['value'] = $value;
  47         $variables['this'] = $this->context->getObject();
  48
  49         if (!$this->getExpressionLanguage()->evaluate($constraint->expression, $variables)) {
  50             $this->context->buildViolation($constraint->message)
  51                 ->setParameter('{{ value }}', $this->formatValue($value))
  52                 ->setCode(Expression::EXPRESSION_FAILED_ERROR)
  53                 ->addViolation();
  54         }
  55     }
  56
  57     private function getExpressionLanguage()
  58     {
  59         if (null === $this->expressionLanguage) {
  60             if (!class_exists('Symfony\Component\ExpressionLanguage\ExpressionLanguage')) {
  61                 throw new RuntimeException('Unable to use expressions as the Symfony ExpressionLanguage component is not installed.');
  62             }
  63             $this->expressionLanguage = new ExpressionLanguage();
  64         }
  65
  66         return $this->expressionLanguage;
  67     }
  68 }