restructuring to use data driven approach with datatypes

Author: Pat-pGuo

Diff for: pyrad/__init__.py

@@ -43,4 +43,4 @@
 __copyright__ = 'Copyright 2002-2023 Wichert Akkerman, Istvan Ruzman and Christian Giese. All rights reserved.'
 __version__ = '2.4'
 
-__all__ = ['client', 'dictionary', 'packet', 'server', 'tools', 'dictfile']
+__all__ = ['client', 'dictionary', 'packet', 'server', 'datatypes', 'dictfile']

Diff for: pyrad/datatypes/__init__.py

@@ -0,0 +1,63 @@
+"""
+base.py
+
+Contains base datatype
+"""
+from abc import ABC, abstractmethod
+
+class AbstractDatatype(ABC):
+    """
+    Root of entire datatype class hierarchy
+    """
+    def __init__(self, name):
+        self.name = name
+
+    @abstractmethod
+    def encode(self, attribute, decoded, *args, **kwargs):
+        """
+        turns python data structure into bytes
+
+        :param *args:
+        :param **kwargs:
+        :param attribute:
+        :param decoded: python data structure to encode
+        :return: encoded bytes
+        """
+
+    @abstractmethod
+    def print(self, attribute, decoded, *args, **kwargs):
+        """
+        returns string representation of decoding
+
+        :param *args:
+        :param **kwargs:
+        :param attribute: attribute object
+        :param decoded: value pair
+        :return: string
+        """
+
+    @abstractmethod
+    def parse(self, dictionary, string, *args, **kwargs):
+        """
+        returns python structure from ASCII string
+
+        :param *args:
+        :param **kwargs:
+        :param dictionary:
+        :param string: ASCII string of attribute
+        :return: python structure for attribute
+        """
+
+    @abstractmethod
+    def get_value(self, dictionary, code, attribute, packet, offset):
+        """
+        retrieves the encapsulated value
+        :param dictionary:
+        :param code:
+        :param *args:
+        :param **kwargs:
+        :param attribute: attribute value
+        :param packet: packet
+        :param offset: attribute starting position
+        :return: encapsulated value, and bytes read
+        """