Actualización

vendor/symfony/form/CallbackTransformer.php

@@ -0,0 +1,75 @@
+<?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\Form;
+
+use Symfony\Component\Form\Exception\UnexpectedTypeException;
+use Symfony\Component\Form\Exception\TransformationFailedException;
+
+class CallbackTransformer implements DataTransformerInterface
+{
+    /**
+     * The callback used for forward transform.
+     *
+     * @var callable
+     */
+    private $transform;
+
+    /**
+     * The callback used for reverse transform.
+     *
+     * @var callable
+     */
+    private $reverseTransform;
+
+    /**
+     * Constructor.
+     *
+     * @param callable $transform        The forward transform callback
+     * @param callable $reverseTransform The reverse transform callback
+     */
+    public function __construct(callable $transform, callable $reverseTransform)
+    {
+        $this->transform = $transform;
+        $this->reverseTransform = $reverseTransform;
+    }
+
+    /**
+     * Transforms a value from the original representation to a transformed representation.
+     *
+     * @param mixed $data The value in the original representation
+     *
+     * @return mixed The value in the transformed representation
+     *
+     * @throws UnexpectedTypeException       when the argument is not of the expected type
+     * @throws TransformationFailedException when the transformation fails
+     */
+    public function transform($data)
+    {
+        return call_user_func($this->transform, $data);
+    }
+
+    /**
+     * Transforms a value from the transformed representation to its original
+     * representation.
+     *
+     * @param mixed $data The value in the transformed representation
+     *
+     * @return mixed The value in the original representation
+     *
+     * @throws UnexpectedTypeException       when the argument is not of the expected type
+     * @throws TransformationFailedException when the transformation fails
+     */
+    public function reverseTransform($data)
+    {
+        return call_user_func($this->reverseTransform, $data);
+    }
+}