[Validator] added a constraint that runs an expression

src/Symfony/Component/Validator/CHANGELOG.md

@@ -4,7 +4,8 @@ CHANGELOG
 2.4.0
 -----
 
-  * added `minRatio`, `maxRatio`, `allowSquare`, `allowLandscape`, and `allowPortrait` to Image validator
+ * added a constraint the uses the expression language
+ * added `minRatio`, `maxRatio`, `allowSquare`, `allowLandscape`, and `allowPortrait` to Image validator
 
 2.3.0
 -----

src/Symfony/Component/Validator/Constraints/Condition.php

@@ -0,0 +1,48 @@
+<?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\Validator\Constraint;
+
+/**
+ * @Annotation
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class Condition extends Constraint
+{
+    public $message = 'This value is not valid.';
+    public $condition;
+
+    /**
+     * {@inheritDoc}
+     */
+    public function getDefaultOption()
+    {
+        return 'condition';
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public function getRequiredOptions()
+    {
+        return array('condition');
+    }
+    /**
+     * {@inheritDoc}
+     */
+    public function getTargets()
+    {
+        return self::CLASS_CONSTRAINT;
+    }
+}

src/Symfony/Component/Validator/Constraints/ConditionValidator.php

@@ -0,0 +1,50 @@
+<?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\Validator\Constraint;
+use Symfony\Component\Validator\ConstraintValidator;
+use Symfony\Component\ExpressionLanguage\ExpressionLanguage;
+
+/**
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class ConditionValidator extends ConstraintValidator
+{
+    private $expressionLanguage;
+
+    /**
+     * {@inheritDoc}
+     */
+    public function validate($object, Constraint $constraint)
+    {
+        if (null === $object) {
+            return;
+        }
+
+        if (!$this->getExpressionLanguage()->evaluate($constraint->condition, array('this' => $object))) {
+            $this->context->addViolation($constraint->message);
+        }
+    }
+
+    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;
+    }
+}