refactor, new model e.t.c.

argenta/command/flag/base_flag/entity.py

@@ -0,0 +1,41 @@
+from typing import Literal, Pattern
+
+
+class BaseFlag:
+    def __init__(self, flag_name: str,
+                 flag_prefix: Literal['-', '--', '---'] = '--',
+                 possible_flag_values: list[str] | Pattern[str] | False = True):
+        self._flag_name = flag_name
+        self._flag_prefix = flag_prefix
+        self.possible_flag_values = possible_flag_values
+
+    def get_string_entity(self):
+        string_entity: str = self._flag_prefix + self._flag_name
+        return string_entity
+
+    def get_flag_name(self):
+        return self._flag_name
+
+    def get_flag_prefix(self):
+        return self._flag_prefix
+
+    def validate_input_flag_value(self, input_flag_value: str | None):
+        if self.possible_flag_values is False:
+            if input_flag_value is None:
+                return True
+            else:
+                return False
+        elif isinstance(self.possible_flag_values, Pattern):
+            is_valid = bool(self.possible_flag_values.match(input_flag_value))
+            if bool(is_valid):
+                return True
+            else:
+                return False
+
+        elif isinstance(self.possible_flag_values, list):
+            if input_flag_value in self.possible_flag_values:
+                return True
+            else:
+                return False
+        else:
+            return True