From 68a9df92227b76b754fe3723679af37eb4e324cb Mon Sep 17 00:00:00 2001
From: Suren Khorenyan <surenkhorenyan@gmail.com>
Date: Wed, 9 Oct 2019 20:03:48 +0300
Subject: [PATCH] Create OrderedHelper

---
 aiogram/utils/helper.py         | 36 +++++++++++++++++++++++++++++++++
 tests/test_utils/test_helper.py | 22 ++++++++++++++++++++
 2 files changed, 58 insertions(+)
 create mode 100644 tests/test_utils/test_helper.py

diff --git a/aiogram/utils/helper.py b/aiogram/utils/helper.py
index 443a2ffe..735afe5d 100644
--- a/aiogram/utils/helper.py
+++ b/aiogram/utils/helper.py
@@ -13,6 +13,9 @@ Example:
     >>> print(MyHelper.all())
     <<<  ['barItem', 'bazItem', 'fooItem', 'lorem']
 """
+from typing import List
+
+PROPS_KEYS_ATTR_NAME = '_props_keys'
 
 
 class Helper:
@@ -191,3 +194,36 @@ class ItemsList(list):
         return self
 
     __iadd__ = __add__ = __rand__ = __and__ = __ror__ = __or__ = add
+
+
+class OrderedHelperMeta(type):
+
+    def __new__(mcs, name, bases, namespace, **kwargs):
+        cls = super().__new__(mcs, name, bases, namespace)
+
+        props_keys = []
+
+        for prop_name in (name for name, prop in namespace.items() if isinstance(prop, (Item, ListItem))):
+            props_keys.append(prop_name)
+
+        setattr(cls, PROPS_KEYS_ATTR_NAME, props_keys)
+
+        return cls
+
+
+class OrderedHelper(metaclass=OrderedHelperMeta):
+    mode = ''
+
+    @classmethod
+    def all(cls) -> List[str]:
+        """
+        Get all Items values
+        """
+        result = []
+        for name in getattr(cls, PROPS_KEYS_ATTR_NAME, []):
+            value = getattr(cls, name)
+            if isinstance(value, ItemsList):
+                result.append(value[0])
+            else:
+                result.append(value)
+        return result
diff --git a/tests/test_utils/test_helper.py b/tests/test_utils/test_helper.py
new file mode 100644
index 00000000..d202d289
--- /dev/null
+++ b/tests/test_utils/test_helper.py
@@ -0,0 +1,22 @@
+from aiogram.utils.helper import OrderedHelper, Item, ListItem
+
+
+class TestOrderedHelper:
+
+    def test_items_are_ordered(self):
+        class Helper(OrderedHelper):
+            A = Item()
+            D = Item()
+            C = Item()
+            B = Item()
+
+        assert Helper.all() == ['A', 'D', 'C', 'B']
+
+    def test_list_items_are_ordered(self):
+        class Helper(OrderedHelper):
+            A = ListItem()
+            D = ListItem()
+            C = ListItem()
+            B = ListItem()
+
+        assert Helper.all() == ['A', 'D', 'C', 'B']