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/property-access/PropertyPathInterface.php

@@ -0,0 +1,88 @@
+<?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\PropertyAccess;
+
+/**
+ * A sequence of property names or array indices.
+ *
+ * @author Bernhard Schussek <bschussek@gmail.com>
+ *
+ * @method bool isNullSafe(int $index) Returns whether the element at the given index is null safe. Not implementing it is deprecated since Symfony 6.2
+ *
+ * @extends \Traversable<int, string>
+ */
+interface PropertyPathInterface extends \Traversable, \Stringable
+{
+    /**
+     * Returns the string representation of the property path.
+     */
+    public function __toString(): string;
+
+    /**
+     * Returns the length of the property path, i.e. the number of elements.
+     *
+     * @return int
+     */
+    public function getLength();
+
+    /**
+     * Returns the parent property path.
+     *
+     * The parent property path is the one that contains the same items as
+     * this one except for the last one.
+     *
+     * If this property path only contains one item, null is returned.
+     *
+     * @return self|null
+     */
+    public function getParent();
+
+    /**
+     * Returns the elements of the property path as array.
+     *
+     * @return list<string>
+     */
+    public function getElements();
+
+    /**
+     * Returns the element at the given index in the property path.
+     *
+     * @param int $index The index key
+     *
+     * @return string
+     *
+     * @throws Exception\OutOfBoundsException If the offset is invalid
+     */
+    public function getElement(int $index);
+
+    /**
+     * Returns whether the element at the given index is a property.
+     *
+     * @param int $index The index in the property path
+     *
+     * @return bool
+     *
+     * @throws Exception\OutOfBoundsException If the offset is invalid
+     */
+    public function isProperty(int $index);
+
+    /**
+     * Returns whether the element at the given index is an array index.
+     *
+     * @param int $index The index in the property path
+     *
+     * @return bool
+     *
+     * @throws Exception\OutOfBoundsException If the offset is invalid
+     */
+    public function isIndex(int $index);
+}