1 files changed, 34 insertions, 0 deletions
diff --git a/neb/typeclass.py b/neb/typeclass.py
new file mode 100644
index 0000000..eae412c
--- /dev/null
+++ b/neb/typeclass.py
@@ -0,0 +1,34 @@
+from enum import Enum, auto
+
+class TypeEnum(Enum):
+    ANY = auto()
+    STRING = auto()
+    INT = auto()
+    FLOAT = auto()
+    NUMBER = auto()
+    LIST = auto()
+    LITERAL = auto()
+    BOOL = auto()
+
+    def __str__(self):
+        return f":{self.name.lower()}"
+
+HIERARCHY = { TypeEnum.ANY: None,
+                    TypeEnum.LITERAL: TypeEnum.ANY,
+                    TypeEnum.LIST: TypeEnum.ANY,
+                    TypeEnum.STRING: TypeEnum.LITERAL,
+                    TypeEnum.BOOL: TypeEnum.LITERAL,
+                    TypeEnum.NUMBER: TypeEnum.LITERAL,
+                    TypeEnum.INT: TypeEnum.NUMBER,
+                    TypeEnum.FLOAT: TypeEnum.NUMBER }
+
+def is_subtype_of(candidate, expected):
+    if candidate == expected:
+        return True
+    parent = HIERARCHY[candidate]
+    while parent is not None:
+        if parent == expected:
+            return True
+        parent = HIERARCHY[parent]
+    return False
+