1 {-# LANGUAGE FlexibleContexts #-}
3 {-# LANGUAGE MultiParamTypeClasses #-}
4 {-# LANGUAGE OverloadedStrings #-}
5 {-# LANGUAGE ScopedTypeVariables #-}
6 {-# LANGUAGE TypeFamilies #-}
7 {-# LANGUAGE UndecidableInstances #-}
8 module Language.LOL.Symantic.Type.Int where
10 import Data.Maybe (isJust)
11 import Data.Type.Equality ((:~:)(Refl))
13 import Language.LOL.Symantic.AST
14 import Language.LOL.Symantic.Type.Common
15 import Language.LOL.Symantic.Type.Fun
16 import Language.LOL.Symantic.Type.Bool
20 data Type_Int (root:: * -> *) h where
21 Type_Int :: Type_Int root Int
22 type instance Root_of_Type (Type_Int root) = root
23 type instance Error_of_Type ast (Type_Int root) = Error_Type_Fun ast
26 Type_Eq (Type_Int root) where
27 type_eq Type_Int Type_Int = Just Refl
29 Eq (Type_Int root h) where
30 x == y = isJust $ type_eq x y
31 instance -- Type_from AST
32 ( Type_Root_Lift Type_Int root
33 , Error_Type_Lift (Error_Type AST) (Error_of_Type AST root)
34 , Error_Type_Lift (Error_Type_Fun AST) (Error_of_Type AST root)
35 , Implicit_HBool (Is_Last_Type (Type_Int root) root)
36 ) => Type_from AST (Type_Int root) where
37 type_from _px_ty ast k =
41 [] -> k $ type_root_lift Type_Int
42 _ -> Left $ error_type_lift $
43 Error_Type_Fun_Wrong_number_of_arguments 0 ast
45 case hbool :: HBool (Is_Last_Type (Type_Int root) root) of
46 HTrue -> error_type_lift $ Error_Type_Unsupported ast
47 HFalse -> error_type_lift $ Error_Type_Unsupported_here ast
48 instance -- String_from_Type
49 String_from_Type (Type_Int root) where
50 string_from_type Type_Int = "Int"
52 Show (Type_Int root h) where
53 show = string_from_type
55 -- | Convenient alias to include a 'Type_Int' within a type.
56 type_int :: Type_Root_Lift Type_Int root => root Int
57 type_int = type_root_lift Type_Int
59 -- * Type 'Type_Fun_Int'
60 -- | Convenient alias.
61 type Type_Fun_Int lam = Type_Root (Type_Alt (Type_Fun lam) Type_Int)
63 -- * Type 'Type_Fun_Bool_Int'
64 -- | Convenient alias.
65 type Type_Fun_Bool_Int lam = Type_Root (Type_Alt (Type_Fun lam) (Type_Alt Type_Bool Type_Int))