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module CC.AST.Typed(
module CC.AST.Typed,
module CC.Types
) where
import Data.List
import CC.Pretty
import CC.Types
data Program = Program [Def]
deriving (Show, Read)
data Def = Def Name Expr
deriving (Show, Read)
data Type = TFun Type Type
| TInt
| TTup [Type]
| TyVar Int
deriving (Show, Read)
data TypeScheme = TypeScheme [Int] Type
deriving (Show, Read)
data Expr = Lam Type Occ Expr
| Call Type Expr Expr
| Int Int
| Tup [Expr]
| Var Occ
deriving (Show, Read)
data Occ = Occ Name Type
deriving (Show, Read)
exprType :: Expr -> Type
exprType (Lam typ _ _) = typ
exprType (Call typ _ _) = typ
exprType (Int _) = TInt
exprType (Tup es) = TTup (map exprType es)
exprType (Var (Occ _ typ)) = typ
instance Pretty Type where
prettyPrec _ TInt = "Int"
prettyPrec p (TFun a b) =
precParens p 2 (prettyPrec 3 a ++ " -> " ++ prettyPrec 2 b)
prettyPrec _ (TTup ts) =
"(" ++ intercalate ", " (map pretty ts) ++ ")"
prettyPrec _ (TyVar i) = 't' : show i
instance Pretty TypeScheme where
prettyPrec p (TypeScheme bnds ty) =
precParens p 2
("forall " ++ intercalate " " (map (pretty . TyVar) bnds) ++ ". " ++
prettyPrec 2 ty)
instance Pretty Expr where
prettyPrec p (Lam ty (Occ n t) e) =
precParens p 2 $
"(\\(" ++ n ++ " :: " ++ pretty t ++ ") -> "
++ prettyPrec 2 e ++ ") :: " ++ pretty ty
prettyPrec p (Call ty e1 e2) =
precParens p 2 $
prettyPrec 3 e1 ++ " " ++ prettyPrec 3 e2 ++ " :: " ++ pretty ty
prettyPrec _ (Int i) = show i
prettyPrec _ (Tup es) = "(" ++ intercalate ", " (map pretty es) ++ ")"
prettyPrec p (Var (Occ n t)) =
precParens p 2 $
show n ++ " :: " ++ pretty t
instance Pretty Def where
pretty (Def n e) = n ++ " = " ++ pretty e
instance Pretty Program where
pretty (Program defs) = concatMap ((++ "\n") . pretty) defs
|