{-# htermination (enumFromOrdering :: Ordering -> (List Ordering)) #-} import qualified Prelude data MyBool = MyTrue | MyFalse data List a = Cons a (List a) | Nil data MyInt = Pos Nat | Neg Nat ; data Nat = Succ Nat | Zero ; data Ordering = LT | EQ | GT ; data WHNF a = WHNF a ; flip :: (c -> a -> b) -> a -> c -> b; flip f x y = f y x; primCmpNat :: Nat -> Nat -> Ordering; primCmpNat Zero Zero = EQ; primCmpNat Zero (Succ y) = LT; primCmpNat (Succ x) Zero = GT; primCmpNat (Succ x) (Succ y) = primCmpNat x y; primCmpInt :: MyInt -> MyInt -> Ordering; primCmpInt (Pos Zero) (Pos Zero) = EQ; primCmpInt (Pos Zero) (Neg Zero) = EQ; primCmpInt (Neg Zero) (Pos Zero) = EQ; primCmpInt (Neg Zero) (Neg Zero) = EQ; primCmpInt (Pos x) (Pos y) = primCmpNat x y; primCmpInt (Pos x) (Neg y) = GT; primCmpInt (Neg x) (Pos y) = LT; primCmpInt (Neg x) (Neg y) = primCmpNat y x; compareMyInt :: MyInt -> MyInt -> Ordering compareMyInt = primCmpInt; esEsOrdering :: Ordering -> Ordering -> MyBool esEsOrdering LT LT = MyTrue; esEsOrdering LT EQ = MyFalse; esEsOrdering LT GT = MyFalse; esEsOrdering EQ LT = MyFalse; esEsOrdering EQ EQ = MyTrue; esEsOrdering EQ GT = MyFalse; esEsOrdering GT LT = MyFalse; esEsOrdering GT EQ = MyFalse; esEsOrdering GT GT = MyTrue; not :: MyBool -> MyBool; not MyTrue = MyFalse; not MyFalse = MyTrue; fsEsOrdering :: Ordering -> Ordering -> MyBool fsEsOrdering x y = not (esEsOrdering x y); ltEsMyInt :: MyInt -> MyInt -> MyBool ltEsMyInt x y = fsEsOrdering (compareMyInt x y) GT; enforceWHNF :: WHNF a -> b -> b; enforceWHNF (WHNF x) y = y; seq :: b -> a -> a; seq x y = enforceWHNF (WHNF x) y; dsEm :: (b -> a) -> b -> a; dsEm f x = seq x (f x); fromIntMyInt :: MyInt -> MyInt fromIntMyInt x = x; primMinusNat :: Nat -> Nat -> MyInt; primMinusNat Zero Zero = Pos Zero; primMinusNat Zero (Succ y) = Neg (Succ y); primMinusNat (Succ x) Zero = Pos (Succ x); primMinusNat (Succ x) (Succ y) = primMinusNat x y; primPlusNat :: Nat -> Nat -> Nat; primPlusNat Zero Zero = Zero; primPlusNat Zero (Succ y) = Succ y; primPlusNat (Succ x) Zero = Succ x; primPlusNat (Succ x) (Succ y) = Succ (Succ (primPlusNat x y)); primPlusInt :: MyInt -> MyInt -> MyInt; primPlusInt (Pos x) (Neg y) = primMinusNat x y; primPlusInt (Neg x) (Pos y) = primMinusNat y x; primPlusInt (Neg x) (Neg y) = Neg (primPlusNat x y); primPlusInt (Pos x) (Pos y) = Pos (primPlusNat x y); psMyInt :: MyInt -> MyInt -> MyInt psMyInt = primPlusInt; numericEnumFrom n = Cons n (dsEm numericEnumFrom (psMyInt n (fromIntMyInt (Pos (Succ Zero))))); otherwise :: MyBool; otherwise = MyTrue; takeWhile0 p x xs MyTrue = Nil; takeWhile1 p x xs MyTrue = Cons x (takeWhile p xs); takeWhile1 p x xs MyFalse = takeWhile0 p x xs otherwise; takeWhile2 p (Cons x xs) = takeWhile1 p x xs (p x); takeWhile3 p Nil = Nil; takeWhile3 xw xx = takeWhile2 xw xx; takeWhile :: (a -> MyBool) -> (List a) -> (List a); takeWhile p Nil = takeWhile3 p Nil; takeWhile p (Cons x xs) = takeWhile2 p (Cons x xs); numericEnumFromTo n m = takeWhile (flip ltEsMyInt m) (numericEnumFrom n); enumFromToMyInt :: MyInt -> MyInt -> (List MyInt) enumFromToMyInt = numericEnumFromTo; fromEnumOrdering :: Ordering -> MyInt fromEnumOrdering LT = Pos Zero; fromEnumOrdering EQ = Pos (Succ Zero); fromEnumOrdering GT = Pos (Succ (Succ Zero)); map :: (b -> a) -> (List b) -> (List a); map f Nil = Nil; map f (Cons x xs) = Cons (f x) (map f xs); primEqNat :: Nat -> Nat -> MyBool; primEqNat Zero Zero = MyTrue; primEqNat Zero (Succ y) = MyFalse; primEqNat (Succ x) Zero = MyFalse; primEqNat (Succ x) (Succ y) = primEqNat x y; primEqInt :: MyInt -> MyInt -> MyBool; primEqInt (Pos (Succ x)) (Pos (Succ y)) = primEqNat x y; primEqInt (Neg (Succ x)) (Neg (Succ y)) = primEqNat x y; primEqInt (Pos Zero) (Neg Zero) = MyTrue; primEqInt (Neg Zero) (Pos Zero) = MyTrue; primEqInt (Neg Zero) (Neg Zero) = MyTrue; primEqInt (Pos Zero) (Pos Zero) = MyTrue; primEqInt vv vw = MyFalse; esEsMyInt :: MyInt -> MyInt -> MyBool esEsMyInt = primEqInt; toEnum0 MyTrue vx = GT; toEnum1 vx = toEnum0 (esEsMyInt vx (Pos (Succ (Succ Zero)))) vx; toEnum2 MyTrue vy = EQ; toEnum2 vz wu = toEnum1 wu; toEnum3 vy = toEnum2 (esEsMyInt vy (Pos (Succ Zero))) vy; toEnum3 wv = toEnum1 wv; toEnum4 MyTrue ww = LT; toEnum4 wx wy = toEnum3 wy; toEnum5 ww = toEnum4 (esEsMyInt ww (Pos Zero)) ww; toEnum5 wz = toEnum3 wz; toEnumOrdering :: MyInt -> Ordering toEnumOrdering ww = toEnum5 ww; toEnumOrdering vy = toEnum3 vy; toEnumOrdering vx = toEnum1 vx; enumFromToOrdering :: Ordering -> Ordering -> (List Ordering) enumFromToOrdering x y = map toEnumOrdering (enumFromToMyInt (fromEnumOrdering x) (fromEnumOrdering y)); enumFromOrdering :: Ordering -> (List Ordering) enumFromOrdering x = enumFromToOrdering x GT;