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/PreloadedExtension.php

@@ -0,0 +1,72 @@
+<?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\InvalidArgumentException;
+
+/**
+ * A form extension with preloaded types, type extensions and type guessers.
+ *
+ * @author Bernhard Schussek <bschussek@gmail.com>
+ */
+class PreloadedExtension implements FormExtensionInterface
+{
+    private array $types = [];
+    private array $typeExtensions = [];
+    private ?FormTypeGuesserInterface $typeGuesser;
+
+    /**
+     * Creates a new preloaded extension.
+     *
+     * @param FormTypeInterface[]            $types          The types that the extension should support
+     * @param FormTypeExtensionInterface[][] $typeExtensions The type extensions that the extension should support
+     */
+    public function __construct(array $types, array $typeExtensions, ?FormTypeGuesserInterface $typeGuesser = null)
+    {
+        $this->typeExtensions = $typeExtensions;
+        $this->typeGuesser = $typeGuesser;
+
+        foreach ($types as $type) {
+            $this->types[$type::class] = $type;
+        }
+    }
+
+    public function getType(string $name): FormTypeInterface
+    {
+        if (!isset($this->types[$name])) {
+            throw new InvalidArgumentException(\sprintf('The type "%s" cannot be loaded by this extension.', $name));
+        }
+
+        return $this->types[$name];
+    }
+
+    public function hasType(string $name): bool
+    {
+        return isset($this->types[$name]);
+    }
+
+    public function getTypeExtensions(string $name): array
+    {
+        return $this->typeExtensions[$name]
+            ?? [];
+    }
+
+    public function hasTypeExtensions(string $name): bool
+    {
+        return !empty($this->typeExtensions[$name]);
+    }
+
+    public function getTypeGuesser(): ?FormTypeGuesserInterface
+    {
+        return $this->typeGuesser;
+    }
+}