--- /dev/null
+<?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\PropertyAccess\PropertyAccess;
+use Symfony\Component\PropertyAccess\PropertyAccessorInterface;
+use Symfony\Component\PropertyAccess\PropertyPath;
+use Symfony\Component\Validator\Constraint;
+use Symfony\Component\Validator\ConstraintValidator;
+use Symfony\Component\Validator\Context\ExecutionContextInterface;
+use Symfony\Component\Validator\Exception\RuntimeException;
+use Symfony\Component\Validator\Exception\UnexpectedTypeException;
+
+/**
+ * @author Fabien Potencier <fabien@symfony.com>
+ * @author Bernhard Schussek <bschussek@symfony.com>
+ */
+class ExpressionValidator extends ConstraintValidator
+{
+ /**
+ * @var PropertyAccessorInterface
+ */
+ private $propertyAccessor;
+
+ /**
+ * @var ExpressionLanguage
+ */
+ private $expressionLanguage;
+
+ public function __construct(PropertyAccessorInterface $propertyAccessor = null, ExpressionLanguage $expressionLanguage = null)
+ {
+ $this->propertyAccessor = $propertyAccessor;
+ $this->expressionLanguage = $expressionLanguage;
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function validate($value, Constraint $constraint)
+ {
+ if (!$constraint instanceof Expression) {
+ throw new UnexpectedTypeException($constraint, __NAMESPACE__.'\Expression');
+ }
+
+ $variables = array();
+
+ // Symfony 2.5+
+ if ($this->context instanceof ExecutionContextInterface) {
+ $variables['value'] = $value;
+ $variables['this'] = $this->context->getObject();
+ } elseif (null === $this->context->getPropertyName()) {
+ $variables['value'] = $value;
+ $variables['this'] = $value;
+ } else {
+ $root = $this->context->getRoot();
+ $variables['value'] = $value;
+
+ if (is_object($root)) {
+ // Extract the object that the property belongs to from the object
+ // graph
+ $path = new PropertyPath($this->context->getPropertyPath());
+ $parentPath = $path->getParent();
+ $variables['this'] = $parentPath ? $this->getPropertyAccessor()->getValue($root, $parentPath) : $root;
+ } else {
+ $variables['this'] = null;
+ }
+ }
+
+ if (!$this->getExpressionLanguage()->evaluate($constraint->expression, $variables)) {
+ if ($this->context instanceof ExecutionContextInterface) {
+ $this->context->buildViolation($constraint->message)
+ ->setParameter('{{ value }}', $this->formatValue($value))
+ ->setCode(Expression::EXPRESSION_FAILED_ERROR)
+ ->addViolation();
+ } else {
+ $this->buildViolation($constraint->message)
+ ->setParameter('{{ value }}', $this->formatValue($value))
+ ->setCode(Expression::EXPRESSION_FAILED_ERROR)
+ ->addViolation();
+ }
+ }
+ }
+
+ private function getExpressionLanguage()
+ {
+ if (null === $this->expressionLanguage) {
+ if (!class_exists('Symfony\Component\ExpressionLanguage\ExpressionLanguage')) {
+ throw new RuntimeException('Unable to use expressions as the Symfony ExpressionLanguage component is not installed.');
+ }
+ $this->expressionLanguage = new ExpressionLanguage();
+ }
+
+ return $this->expressionLanguage;
+ }
+
+ private function getPropertyAccessor()
+ {
+ if (null === $this->propertyAccessor) {
+ if (!class_exists('Symfony\Component\PropertyAccess\PropertyAccess')) {
+ throw new RuntimeException('Unable to use expressions as the Symfony PropertyAccess component is not installed.');
+ }
+ $this->propertyAccessor = PropertyAccess::createPropertyAccessor();
+ }
+
+ return $this->propertyAccessor;
+ }
+}