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web/vendor/symfony/validator/Constraints/ExpressionValidator.php

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+<?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;
+    }
+}