Added Helpers::escape()

This reverts commit df4eef2.

src/DI/Helpers.php

@@ -98,6 +98,27 @@ public static function expand($var, array $params, $recursive = false)
 	}
 
 
+	/**
+	 * Escapes '%' and '@'
+	 * @param  mixed
+	 * @return mixed
+	 */
+	public static function escape($value)
+	{
+		if (is_array($value)) {
+			$res = [];
+			foreach ($value as $key => $val) {
+				$key = is_string($key) ? str_replace('%', '%%', $key) : $key;
+				$res[$key] = self::escape($val);
+			}
+			return $res;
+		} elseif (is_string($value)) {
+			return preg_replace('#^@|%#', '$0$0', $value);
+		}
+		return $value;
+	}
+
+
 	/**
 	 * Performs internal functions like not(), bool() ... recursively.
 	 */

tests/DI/Helpers.escape().phpt

@@ -0,0 +1,23 @@
+<?php
+
+/**
+ * Test: Nette\DI\Helpers::escape()
+ */
+
+declare(strict_types=1);
+
+use Nette\DI\Helpers;
+use Tester\Assert;
+
+
+require __DIR__ . '/../bootstrap.php';
+
+
+Assert::same(123, Helpers::escape(123));
+Assert::same('%%a%%', Helpers::escape('%a%'));
+Assert::same('@@', Helpers::escape('@'));
+Assert::same('x@', Helpers::escape('x@'));
+Assert::same(
+	['key1' => '%%', 'key2' => '@@', '%%a%%' => 123, '@' => 123],
+	Helpers::escape(['key1' => '%', 'key2' => '@', '%a%' => 123, '@' => 123])
+);