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{-# LANGUAGE ConstraintKinds, DataKinds, PolyKinds, TypeFamilies, | |
TypeOperators, RankNTypes, TypeFamilies, UndecidableInstances #-} | |
import GHC.Prim (Constraint) | |
import Control.Exception -- (Exception, SomeException, catch, throw) | |
import Control.Monad (ap) | |
type family If (b :: Bool) :: Constraint where | |
If 'True = () | |
If 'False = ("Error" ~ "If: False") | |
type family Contains (e :: k) (es :: [k]) :: Constraint where | |
Contains e (e ': es) = () | |
Contains x (e ': es) = Contains x es | |
Contains x '[] = ("Error" ~ "Exception not found in thrown exceptions") | |
type family DoesntContain (e :: k) (es :: [k]) :: Constraint where | |
DoesntContain e (e ': es) = ("Error" ~ "DoesntContain: type found in list when it wasn't expected") | |
DoesntContain x (e ': es) = DoesntContain x es | |
DoesntContain x '[] = () | |
type family Exceptions (es :: [k]) :: Constraint where | |
Exceptions '[] = () | |
Exceptions (e ': es) = (Exception e, Exceptions es) | |
type family AllInClass (c :: k -> Constraint) (xs :: [k]) :: Constraint where | |
AllInClass c '[] = () | |
AllInClass c (x ': xs) = (c x, AllInClass c xs) | |
type family InClasses (a :: k) (cs :: [k -> Constraint]) :: Constraint where | |
InClasses a (c ': cs) = (c a, InClasses a cs) | |
InClasses a '[] = () | |
type family Insert (e :: k) (es :: [k]) :: [k] where | |
Insert e (e ': es) = e ': es | |
Insert x (e ': es) = e ': (Insert x es) | |
Insert x '[] = '[x] | |
type family Concat (es :: [k]) (fs :: [k]) :: [k] where | |
Concat es '[] = es | |
Concat es (f ': fs) = Concat (Insert f es) fs | |
type family Merge (xs :: [k]) (ys :: [k]) :: [k] where | |
Merge es '[] = es | |
Merge ls (r ': rs) = Merge (Insert r ls) rs | |
type family Delete (e :: k) (es :: [k]) :: [k] where | |
Delete e (e ': es) = es | |
Delete x (e ': es) = e ': (Delete x es) | |
Delete x '[] = '[] | |
-- openFile :: Throws '[FilenotfoundException, PermissionError] String | |
type CommonExceptions = | |
'[ArithException | |
, ErrorCall | |
, PatternMatchFail | |
, ArrayException | |
] | |
newtype ThrowsI i j a = ThrowsI (IO a) | |
instance IxFunctor ThrowsI where | |
imap f (ThrowsI i) = ThrowsI (fmap f i) | |
instance IxPointed ThrowsI where | |
ireturn x = ThrowsI (return x) | |
instance IxApplicative ThrowsI where | |
iap (ThrowsI fi) (ThrowsI ai) = ThrowsI (ap fi ai) | |
instance IxMonad ThrowsI where | |
-- ibind :: (a -> ThrowsI j k b) -> ThrowsI i j a -> ThrowsI i k b | |
ibind f (ThrowsI i) = ThrowsI $ do | |
x <- i | |
let ThrowsI r = f x | |
r | |
type Throwing e es a = Throws es (Insert e es) a | |
test0 :: ThrowsI es es a | |
test0 = undefined | |
test1 :: ThrowsI es (Insert ArithException es) a | |
test1 = undefined | |
test2 :: ThrowsI es (Insert NonTermination es) a | |
test2 = undefined | |
test3 :: ThrowsI es (Insert PatternMatchFail es) a | |
test3 = undefined | |
catch'' :: (Contains e es, Exception e) => ThrowsI fe es a -> (e -> IO a) -> ThrowsI fe (Delete e es) a | |
catch'' (ThrowsI i) h = ThrowsI (catch i h) | |
throw'' :: (Exception e) => e -> ThrowsI es (Insert e es) a | |
throw'' e = ThrowsI (throw e) | |
try'' :: (Contains e es, Exception e) => ThrowsI fs es a -> ThrowsI fs (Delete e es) (Either e a) | |
try'' (ThrowsI i) = ThrowsI (try i) | |
runSafe :: ThrowsI CommonExceptions '[] a -> IO a | |
runSafe (ThrowsI i) = i >>= evaluate | |
runUnsafe :: ThrowsI fs es a -> IO a | |
runUnsafe (ThrowsI i) = i >>= evaluate | |
-- ============ Control.Monad.Indexed ========= | |
class IxFunctor f where | |
imap :: (a -> b) -> f j k a -> f j k b | |
class IxPointed m => IxApplicative m where | |
iap :: m i j (a -> b) -> m j k a -> m i k b | |
class IxFunctor m => IxPointed m where | |
ireturn :: a -> m i i a | |
class IxFunctor w => IxCopointed w where | |
iextract :: w i i a -> a | |
class IxApplicative m => IxMonad m where | |
ibind :: (a -> m j k b) -> m i j a -> m i k b | |
ijoin :: IxMonad m => m i j (m j k a) -> m i k a | |
ijoin = ibind id | |
infixr 1 =<<< | |
infixl 1 >>>= | |
(>>>=) :: IxMonad m => m i j a -> (a -> m j k b) -> m i k b | |
m >>>= k = ibind k m | |
(=<<<) :: IxMonad m => (a -> m j k b) -> m i j a -> m i k b | |
(=<<<) = ibind | |
iapIxMonad :: IxMonad m => m i j (a -> b) -> m j k a -> m i k b | |
iapIxMonad f x = f >>>= \ f' -> x >>>= \x' -> ireturn (f' x') | |
-- ============= End Control.Monad.Indexed ========= | |
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