From 583192a9c8ee39814799c28e01d5f42963d3eda4 Mon Sep 17 00:00:00 2001
From: Alex Root Junior <jroot.junior@gmail.com>
Date: Sun, 23 Jul 2017 06:05:02 +0300
Subject: [PATCH] Add consts helper.

---
 aiogram/utils/helper.py | 178 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 178 insertions(+)
 create mode 100644 aiogram/utils/helper.py

diff --git a/aiogram/utils/helper.py b/aiogram/utils/helper.py
new file mode 100644
index 00000000..0abd542d
--- /dev/null
+++ b/aiogram/utils/helper.py
@@ -0,0 +1,178 @@
+"""
+Example:
+    >>> from aiogram.utils.helper import Helper, ListItem, HelperMode, Item
+    >>> class MyHelper(Helper):
+    ...     mode = HelperMode.camelCase
+    ...     FOO_ITEM = ListItem()
+    ...     BAR_ITEM = ListItem()
+    ...     BAZ_ITEM = ListItem()
+    ...     LOREM = Item()
+    ...
+    >>> print(MyHelper.FOO_ITEM & MyHelper.BAR_ITEM)
+    <<<  ['fooItem', 'barItem']
+    >>> print(MyHelper.all())
+    <<<  ['barItem', 'bazItem', 'fooItem', 'lorem']
+"""
+
+
+class Helper:
+    mode = ''
+
+    @classmethod
+    def all(cls):
+        """
+        Get all consts
+        :return: list
+        """
+        result = []
+        for name in dir(cls):
+            if not name.isupper():
+                continue
+            value = getattr(cls, name)
+            if isinstance(value, ItemsList):
+                result.append(value[0])
+            else:
+                result.append(value)
+        return result
+
+
+class HelperMode(Helper):
+    mode = 'original'
+
+    UPPER_CASE = 'upperCase'
+    camelCase = 'camelCase'
+    CamelCase = 'CamelCase'
+    lower_case = 'lower_case'
+    lowercase = 'lowercase'
+
+    @classmethod
+    def _upper_case(cls, text):
+        """
+        Transform text to UPPER_CASE
+
+        :param text:
+        :return:
+        """
+        if text.isupper():
+            return text
+        result = ''
+        for pos, symbol in enumerate(text):
+            if symbol.isupper() and pos > 0:
+                result += '_' + symbol
+            else:
+                result += symbol.upper()
+        return result
+
+    @classmethod
+    def _lower_case(cls, text):
+        """
+        Transform text to lower_case (Based on UPPER_CASE)
+
+        :param text:
+        :return:
+        """
+        if text.islower():
+            return text
+        return cls._upper_case(text).lower()
+
+    @classmethod
+    def _camel_case(cls, text, first_upper=False):
+        """
+        Transform text to camelCase or CamelCase
+
+        :param text:
+        :param first_upper: first symbol must be upper?
+        :return:
+        """
+        result = ''
+        need_upper = False
+        for pos, symbol in enumerate(text):
+            if symbol == '_' and pos > 0:
+                need_upper = True
+            else:
+                if need_upper:
+                    result += symbol.upper()
+                else:
+                    result += symbol.lower()
+                need_upper = False
+        if first_upper:
+            result = result[0].upper() + result[1:]
+        return result
+
+    @classmethod
+    def apply(cls, text, mode):
+        """
+        Apply mode for text
+
+        :param text:
+        :param mode:
+        :return:
+        """
+        if mode == cls.UPPER_CASE:
+            return cls._upper_case(text)
+        elif mode == cls.lower_case:
+            return cls._lower_case(text)
+        elif mode == cls.lowercase:
+            return cls._lower_case(text).replace('_', '')
+        elif mode == cls.camelCase:
+            return cls._camel_case(text)
+        elif mode == cls.CamelCase:
+            return cls._camel_case(text, True)
+        elif callable(mode):
+            return mode(text)
+        return text
+
+
+class Item:
+    """
+    Helper item
+
+    If value is not configured it will be generated automatically based on variable name
+    """
+
+    def __init__(self, value=None):
+        self._value = value
+
+    def __get__(self, instance, owner):
+        return self._value
+
+    def __set_name__(self, owner, name):
+        if not name.isupper():
+            raise NameError('Name for helper item must be in uppercase!')
+        if not self._value:
+            if hasattr(owner, 'mode'):
+                self._value = HelperMode.apply(name, getattr(owner, 'mode'))
+
+
+class ListItem(Item):
+    """
+    This item always is list
+
+    You can use &, | and + operators for that.
+    """
+
+    def add(self, other):
+        return self + other
+
+    def __get__(self, instance, owner):
+        return ItemsList(self._value)
+
+    # Need only for IDE
+    __iadd__ = __add__ = __rand__ = __and__ = __ror__ = __or__ = add
+
+
+class ItemsList(list):
+    """
+    Patch for default list
+
+    This class provide +, &, |, +=, &=, |= operators for extending the list
+    """
+
+    def __init__(self, *seq):
+        super(ItemsList, self).__init__(map(str, seq))
+
+    def add(self, other):
+        self.extend(other)
+        return self
+
+    __iadd__ = __add__ = __rand__ = __and__ = __ror__ = __or__ = add