N°8771 - Add Symfony form component to iTop core (#760)

- Add Symfony Form Component
- Add Symfony CSRF security component
- Add iTop default form template
- Add Twig debug extension to Twig Environment
- Add iTop abstract controller facility to get form builder
- Add Twig filter to make trans an alias of dict_s filter

lib/symfony/form/DataMapperInterface.php

@@ -0,0 +1,66 @@
+<?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;
+
+/**
+ * @author Bernhard Schussek <bschussek@gmail.com>
+ */
+interface DataMapperInterface
+{
+    /**
+     * Maps the view data of a compound form to its children.
+     *
+     * The method is responsible for calling {@link FormInterface::setData()}
+     * on the children of compound forms, defining their underlying model data.
+     *
+     * @param mixed                              $viewData View data of the compound form being initialized
+     * @param \Traversable<mixed, FormInterface> $forms    A list of {@link FormInterface} instances
+     *
+     * @return void
+     *
+     * @throws Exception\UnexpectedTypeException if the type of the data parameter is not supported
+     */
+    public function mapDataToForms(mixed $viewData, \Traversable $forms);
+
+    /**
+     * Maps the model data of a list of children forms into the view data of their parent.
+     *
+     * This is the internal cascade call of FormInterface::submit for compound forms, since they
+     * cannot be bound to any input nor the request as scalar, but their children may:
+     *
+     *     $compoundForm->submit($arrayOfChildrenViewData)
+     *     // inside:
+     *     $childForm->submit($childViewData);
+     *     // for each entry, do the same and/or reverse transform
+     *     $this->dataMapper->mapFormsToData($compoundForm, $compoundInitialViewData)
+     *     // then reverse transform
+     *
+     * When a simple form is submitted the following is happening:
+     *
+     *     $simpleForm->submit($submittedViewData)
+     *     // inside:
+     *     $this->viewData = $submittedViewData
+     *     // then reverse transform
+     *
+     * The model data can be an array or an object, so this second argument is always passed
+     * by reference.
+     *
+     * @param \Traversable<mixed, FormInterface> $forms     A list of {@link FormInterface} instances
+     * @param mixed                              &$viewData The compound form's view data that get mapped
+     *                                                      its children model data
+     *
+     * @return void
+     *
+     * @throws Exception\UnexpectedTypeException if the type of the data parameter is not supported
+     */
+    public function mapFormsToData(\Traversable $forms, mixed &$viewData);
+}