yaffs.net 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\PropertyAccess\PropertyAccess;
  16 use Symfony\Component\PropertyAccess\PropertyAccessorInterface;
  17 use Symfony\Component\PropertyAccess\PropertyPath;
  18 use Symfony\Component\Validator\Constraint;
  19 use Symfony\Component\Validator\ConstraintValidator;
  20 use Symfony\Component\Validator\Context\ExecutionContextInterface;
  21 use Symfony\Component\Validator\Exception\RuntimeException;
  22 use Symfony\Component\Validator\Exception\UnexpectedTypeException;
  23
  24 /**
  25  * @author Fabien Potencier <fabien@symfony.com>
  26  * @author Bernhard Schussek <bschussek@symfony.com>
  27  */
  28 class ExpressionValidator extends ConstraintValidator
  29 {
  30     /**
  31      * @var PropertyAccessorInterface
  32      */
  33     private $propertyAccessor;
  34
  35     /**
  36      * @var ExpressionLanguage
  37      */
  38     private $expressionLanguage;
  39
  40     public function __construct(PropertyAccessorInterface $propertyAccessor = null, ExpressionLanguage $expressionLanguage = null)
  41     {
  42         $this->propertyAccessor = $propertyAccessor;
  43         $this->expressionLanguage = $expressionLanguage;
  44     }
  45
  46     /**
  47      * {@inheritdoc}
  48      */
  49     public function validate($value, Constraint $constraint)
  50     {
  51         if (!$constraint instanceof Expression) {
  52             throw new UnexpectedTypeException($constraint, __NAMESPACE__.'\Expression');
  53         }
  54
  55         $variables = array();
  56
  57         // Symfony 2.5+
  58         if ($this->context instanceof ExecutionContextInterface) {
  59             $variables['value'] = $value;
  60             $variables['this'] = $this->context->getObject();
  61         } elseif (null === $this->context->getPropertyName()) {
  62             $variables['value'] = $value;
  63             $variables['this'] = $value;
  64         } else {
  65             $root = $this->context->getRoot();
  66             $variables['value'] = $value;
  67
  68             if (is_object($root)) {
  69                 // Extract the object that the property belongs to from the object
  70                 // graph
  71                 $path = new PropertyPath($this->context->getPropertyPath());
  72                 $parentPath = $path->getParent();
  73                 $variables['this'] = $parentPath ? $this->getPropertyAccessor()->getValue($root, $parentPath) : $root;
  74             } else {
  75                 $variables['this'] = null;
  76             }
  77         }
  78
  79         if (!$this->getExpressionLanguage()->evaluate($constraint->expression, $variables)) {
  80             if ($this->context instanceof ExecutionContextInterface) {
  81                 $this->context->buildViolation($constraint->message)
  82                     ->setParameter('{{ value }}', $this->formatValue($value))
  83                     ->setCode(Expression::EXPRESSION_FAILED_ERROR)
  84                     ->addViolation();
  85             } else {
  86                 $this->buildViolation($constraint->message)
  87                     ->setParameter('{{ value }}', $this->formatValue($value))
  88                     ->setCode(Expression::EXPRESSION_FAILED_ERROR)
  89                     ->addViolation();
  90             }
  91         }
  92     }
  93
  94     private function getExpressionLanguage()
  95     {
  96         if (null === $this->expressionLanguage) {
  97             if (!class_exists('Symfony\Component\ExpressionLanguage\ExpressionLanguage')) {
  98                 throw new RuntimeException('Unable to use expressions as the Symfony ExpressionLanguage component is not installed.');
  99             }
 100             $this->expressionLanguage = new ExpressionLanguage();
 101         }
 102
 103         return $this->expressionLanguage;
 104     }
 105
 106     private function getPropertyAccessor()
 107     {
 108         if (null === $this->propertyAccessor) {
 109             if (!class_exists('Symfony\Component\PropertyAccess\PropertyAccess')) {
 110                 throw new RuntimeException('Unable to use expressions as the Symfony PropertyAccess component is not installed.');
 111             }
 112             $this->propertyAccessor = PropertyAccess::createPropertyAccessor();
 113         }
 114
 115         return $this->propertyAccessor;
 116     }
 117 }