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/Util/FormUtil.php

@@ -0,0 +1,68 @@
+<?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\Util;
+
+/**
+ * @author Bernhard Schussek <bschussek@gmail.com>
+ */
+class FormUtil
+{
+    /**
+     * This class should not be instantiated.
+     */
+    private function __construct()
+    {
+    }
+
+    /**
+     * Returns whether the given data is empty.
+     *
+     * This logic is reused multiple times throughout the processing of
+     * a form and needs to be consistent. PHP keyword `empty` cannot
+     * be used as it also considers 0 and "0" to be empty.
+     */
+    public static function isEmpty(mixed $data): bool
+    {
+        // Should not do a check for [] === $data!!!
+        // This method is used in occurrences where arrays are
+        // not considered to be empty, ever.
+        return null === $data || '' === $data;
+    }
+
+    /**
+     * Recursively replaces or appends elements of the first array with elements
+     * of second array. If the key is an integer, the values will be appended to
+     * the new array; otherwise, the value from the second array will replace
+     * the one from the first array.
+     */
+    public static function mergeParamsAndFiles(array $params, array $files): array
+    {
+        $isFilesList = array_is_list($files);
+
+        foreach ($params as $key => $value) {
+            if (\is_array($value) && \is_array($files[$key] ?? null)) {
+                $params[$key] = self::mergeParamsAndFiles($value, $files[$key]);
+                unset($files[$key]);
+            }
+        }
+
+        if (!$isFilesList) {
+            return array_replace($params, $files);
+        }
+
+        foreach ($files as $value) {
+            $params[] = $value;
+        }
+
+        return $params;
+    }
+}