parser logic added

lib/services/backup_format.dart

@@ -3,7 +3,7 @@ library;
 
 import 'dart:convert';
 
-const int kBackupVersion = 1;
+const int kBackupVersion = 2;
 
 class BackupDocument {
   const BackupDocument({
@@ -14,6 +14,8 @@ class BackupDocument {
     required this.products,
     required this.shops,
     required this.shopItems,
+    required this.shoppingLists,
+    required this.shoppingListItems,
     required this.images,
   });
 
@@ -24,6 +26,8 @@ class BackupDocument {
   final List<Map<String, Object?>> products;
   final List<Map<String, Object?>> shops;
   final List<Map<String, Object?>> shopItems;
+  final List<Map<String, Object?>> shoppingLists;
+  final List<Map<String, Object?>> shoppingListItems;
   final Map<String, String> images;
 
   Map<String, Object?> toJson() => {
@@ -35,6 +39,8 @@ class BackupDocument {
     'products': products,
     'shops': shops,
     'shopItems': shopItems,
+    'shoppingLists': shoppingLists,
+    'shoppingListItems': shoppingListItems,
     'images': images,
   };
 
@@ -60,6 +66,8 @@ class BackupDocument {
       products: _maps(decoded['products']),
       shops: _maps(decoded['shops']),
       shopItems: _maps(decoded['shopItems']),
+      shoppingLists: _maps(decoded['shoppingLists']),
+      shoppingListItems: _maps(decoded['shoppingListItems']),
       images: _strings(decoded['images']),
     );
   }