Refactor getting primitive data type into util

src/ifcopenshell-python/ifcopenshell/util/attribute.py

@@ -0,0 +1,29 @@
+def get_primitive_type(attribute_or_data_type):
+    if hasattr(attribute_or_data_type, "type_of_attribute"):
+        data_type = str(attribute_or_data_type.type_of_attribute())
+    else:
+        data_type = str(attribute_or_data_type)
+    if "<list" in data_type:
+        return ("list", get_primitive_type(data_type.replace("<list", "")))
+    elif "<entity" in data_type:
+        return "entity"
+    elif "<string>" in data_type:
+        return "string"
+    elif "<real>" in data_type:
+        return "float"
+    elif "<number>" in data_type or "<integer>" in data_type:
+        return "integer"
+    elif "<boolean>" in data_type or "<logical>" in data_type:
+        return "boolean"
+    elif "<enumeration" in data_type:
+        return "enum"
+    elif "<select" in data_type:
+        return "select"
+
+
+def get_enum_items(attribute):
+    return attribute.type_of_attribute().declared_type().enumeration_items()
+
+
+def get_select_items(attribute):
+    return attribute.type_of_attribute().declared_type().select_list()