RWST.dcl

   1 definition module RWST
   2
   3 from Control.Applicative import class Applicative
   4 from Control.Monad import class Monad
   5 from Data.Void import :: Void
   6 from Data.Functor import class Functor
   7 from Data.Functor.Identity import :: Identity
   8 from Data.Monoid import class Monoid, class Semigroup
   9
  10 :: RWS r w s a :== RWST r w s Identity a
  11
  12 // The RWST monad transformer
  13 :: RWST r w s m a = RWST (r s -> m (a, s, w))
  14
  15 instance Functor (RWST r w s m) | Monad m & Monoid w
  16 instance Applicative (RWST r w s m) | Monad m & Monoid w
  17 instance Monad (RWST r w s m) | Monad m & Monoid w
  18
  19 runRWST :: (RWST r w s m a) r s -> m (a, s, w)
  20 evalRWST :: (RWST r w s m a) r s -> m (a, w) | Monad m
  21 execRWST :: (RWST r w s m a) r s -> m (s, w) | Monad m
  22 mapRWST :: ((m (a, s, w)) -> n (b, s, w`)) (RWST r w s m a) -> RWST r w` s n b
  23 withRWST :: (r` -> s -> (r, s)) (RWST r w s m a) -> RWST r` w s m a
  24
  25 // Reader operations
  26 ask :: RWST r w s m r | Monoid w & Monad m
  27 local :: (r -> r) (RWST r w s m a) -> RWST r w s m a | Monoid w & Monad m
  28 asks :: (r -> a) -> RWST r w s m a | Monoid w & Monad m
  29
  30 // Writer operations
  31 tell :: w -> RWST r w s m Void | Monoid w & Monad m
  32 listen :: (RWST r w s m a) -> RWST r w s m (a, w) | Monoid w & Monad m
  33 pass :: (RWST r w s m (a, w -> w)) -> RWST r w s m a | Monoid w & Monad m
  34 listens :: (w -> b) (RWST r w s m a) -> RWST r w s m (a, b)| Monoid w & Monad m
  35 censor :: (w -> w) (RWST r w s m a) -> RWST r w s m a | Monoid w & Monad m
  36
  37 // State operations
  38 get :: RWST r w s m s | Monoid w & Monad m
  39 put :: s -> RWST r w s m Void | Monoid w & Monad m
  40 modify :: (s -> s) -> RWST r w s m Void | Monoid w & Monad m
  41 gets :: (s -> a) -> RWST r w s m a | Monoid w & Monad m
  42
  43 // Lifting other operations
  44 liftCallCC :: ((((a,s,w) -> m (b,s,w)) -> m (a,s,w)) -> m (a,s,w)) ((a -> RWST r w s m b) -> RWST r w s m a) -> RWST r w s m a | Monoid w
  45 liftCallCC` :: ((((a,s,w) -> m (b,s,w)) -> m (a,s,w)) -> m (a,s,w)) ((a -> RWST r w s m b) -> RWST r w s m a) -> RWST r w s m a | Monoid w
  46 liftCatch :: ((m (a,s,w)) (e -> m (a,s,w)) -> m (a,s,w)) (RWST l w s m a) (e -> RWST l w s m a) -> RWST l w s m a