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/polyfill-intl-icu/DateFormat/Transformer.php

@@ -0,0 +1,65 @@
+<?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\Polyfill\Intl\Icu\DateFormat;
+
+/**
+ * Parser and formatter for date formats.
+ *
+ * @author Igor Wiedler <igor@wiedler.ch>
+ *
+ * @internal
+ */
+abstract class Transformer
+{
+    /**
+     * Format a value using a configured DateTime as date/time source.
+     *
+     * @param \DateTime $dateTime A DateTime object to be used to generate the formatted value
+     * @param int       $length   The formatted value string length
+     *
+     * @return string The formatted value
+     */
+    abstract public function format(\DateTime $dateTime, int $length): string;
+
+    /**
+     * Returns a reverse matching regular expression of a string generated by format().
+     *
+     * @param int $length The length of the value to be reverse matched
+     *
+     * @return string The reverse matching regular expression
+     */
+    abstract public function getReverseMatchingRegExp(int $length): string;
+
+    /**
+     * Extract date options from a matched value returned by the processing of the reverse matching
+     * regular expression.
+     *
+     * @param string $matched The matched value
+     * @param int    $length  The length of the Transformer pattern string
+     *
+     * @return array An associative array
+     */
+    abstract public function extractDateOptions(string $matched, int $length): array;
+
+    /**
+     * Pad a string with zeros to the left.
+     *
+     * @param string $value  The string to be padded
+     * @param int    $length The length to pad
+     *
+     * @return string The padded string
+     */
+    protected function padLeft(string $value, int $length): string
+    {
+        return str_pad($value, $length, '0', \STR_PAD_LEFT);
+    }
+}