Created
December 9, 2018 18:44
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ContT experiment
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{-# LANGUAGE DeriveFoldable #-} | |
{-# LANGUAGE DeriveTraversable #-} | |
{-# LANGUAGE DeriveFunctor #-} | |
{-# LANGUAGE GeneralizedNewtypeDeriving #-} | |
import Control.Monad.Cont | |
import Control.Monad.Reader | |
import Control.Monad.IO.Class | |
import qualified Data.Map.Strict as M | |
_chainCPS :: ((a -> r) -> r) -> (a -> ((b -> r) -> r)) -> ((b -> r) -> r) | |
--chainCPS car acbr = \br -> car (`acbr` br) | |
_chainCPS car acbr = \br -> car $ \a' -> acbr a' br | |
data T a = V a | P String | A String (T a) | |
deriving (Eq,Show) | |
type Env = M.Map Int String | |
newtype Ev r a = Ev { unEv :: (ContT r (ReaderT Env IO) a) } | |
deriving (Functor,Applicative,Monad,MonadIO,MonadCont,MonadReader Env) | |
--runEv :: Env -> -> IO r | |
runEv :: Env -> Ev r a -> (a -> ReaderT Env IO r) -> IO r | |
runEv e act cc = runReaderT (runContT (unEv act) cc) e | |
red :: T Int -> (T Int -> Ev s (T Int)) -> Ev r (T Int) | |
red (V i) _ = P <$> reader (M.! i) | |
red (A f t) k = red t k >>= \t' -> do | |
case f of | |
"print" -> liftIO $ print t' | |
_ -> return () | |
return t' | |
red t _ = return t | |
go = runEv (M.fromList [(0,"foo")]) (callCC $ red $ (A "print" (V (0 :: Int)))) (liftIO . print) | |
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