Add Enum base class

A helper class for handling enum classes with various lookup helpers

src/corelibs/var_handling/enum_base.py

@@ -0,0 +1,75 @@
+"""
+Enum base classes
+"""
+
+from enum import Enum
+from typing import Any
+
+
+class EnumBase(Enum):
+    """
+    base for enum
+    lookup_any and from_any will return "EnumBase" and the sub class name
+    run the return again to "from_any" to get a clean value, or cast it
+    """
+
+    @classmethod
+    def lookup_key(cls, enum_key: str):
+        """Lookup from key side (must be string)"""
+        # if there is a ":", then this is legacy, replace with ___
+        if ":" in enum_key:
+            enum_key = enum_key.replace(':', '___')
+        try:
+            return cls[enum_key.upper()]
+        except KeyError as e:
+            raise ValueError(f"Invalid key: {enum_key}") from e
+        except AttributeError as e:
+            raise ValueError(f"Invalid key: {enum_key}") from e
+
+    @classmethod
+    def lookup_value(cls, enum_value: Any):
+        """Lookup through value side"""
+        try:
+            return cls(enum_value)
+        except ValueError as e:
+            raise ValueError(f"Invalid value: {enum_value}") from e
+
+    @classmethod
+    def from_any(cls, enum_any: Any):
+        """
+        This only works in the following order
+        -> class itself, as is
+        -> str, assume key lookup
+        -> if failed try other
+
+        Arguments:
+            enum_any {Any} -- _description_
+
+        Returns:
+            _type_ -- _description_
+        """
+        if isinstance(enum_any, cls):
+            return enum_any
+        # try key first if it is string
+        # if failed try value
+        if isinstance(enum_any, str):
+            try:
+                return cls.lookup_key(enum_any)
+            except (ValueError, AttributeError):
+                try:
+                    return cls.lookup_value(enum_any)
+                except ValueError as e:
+                    raise ValueError(f"Could not find as key or value: {enum_any}") from e
+        return cls.lookup_value(enum_any)
+
+    def to_value(self) -> Any:
+        """Convert to value"""
+        return self.value
+
+    def to_lower_case(self) -> str:
+        """return lower case"""
+        return self.name.lower()
+
+    def __str__(self) -> str:
+        """return [Enum].NAME like it was called with .name"""
+        return self.name