-- Communicating Haskell Processes.
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-- | Various (orphan) instances for monads from the chp and chp-plus libraries
-- for classes from the transformers library.
--
-- There are 'MonadIO' instances for:
--
-- * 'CHP'
-- 
-- * 'CHPTest'
-- 
-- * 'Composed'
--
-- There are 'MonadCHP' instances of the form @instance MonadCHP m => MonadCHP
-- (t m)@, where t is one of the monad transformers:
--
-- * WriterT (lazy and strict)
--
-- * StateT (lazy and strict)
--
-- * RWST (lazy and strict)
--
-- * 'ReaderT'
--
-- * 'ErrorT'
--
-- * 'ContT'
--
-- * 'IdentityT'

module Control.Concurrent.CHP.Transformers where

import Control.Concurrent.CHP
import Control.Concurrent.CHP.Composed
import Control.Concurrent.CHP.Test
import Control.Monad.IO.Class
import Control.Monad.Trans.Cont
import Control.Monad.Trans.Error
import Control.Monad.Trans.Identity
import Control.Monad.Trans.Maybe
import Control.Monad.Trans.Reader
import qualified Control.Monad.Trans.RWS.Lazy as LR
import qualified Control.Monad.Trans.RWS.Strict as SR
import qualified Control.Monad.Trans.State.Lazy as LS
import qualified Control.Monad.Trans.State.Strict as SS
import qualified Control.Monad.Trans.Writer.Lazy as LW
import qualified Control.Monad.Trans.Writer.Strict as SW
import Control.Monad.Trans.Class
import Data.Monoid


instance MonadIO CHP where
  liftIO = liftIO_CHP

instance (Monoid w, MonadCHP m) => MonadCHP (LW.WriterT w m) where
  liftCHP = lift . liftCHP

instance (Monoid w, MonadCHP m) => MonadCHP (SW.WriterT w m) where
  liftCHP = lift . liftCHP

instance MonadCHP m => MonadCHP (LS.StateT s m) where
  liftCHP = lift . liftCHP

instance MonadCHP m => MonadCHP (SS.StateT s m) where
  liftCHP = lift . liftCHP

instance (Monoid w, MonadCHP m) => MonadCHP (LR.RWST r w s m) where
  liftCHP = lift . liftCHP

instance (Monoid w, MonadCHP m) => MonadCHP (SR.RWST r w s m) where
  liftCHP = lift . liftCHP

instance (Error e, MonadCHP m) => MonadCHP (ErrorT e m) where
  liftCHP = lift . liftCHP

instance MonadCHP m => MonadCHP (ReaderT r m) where
  liftCHP = lift . liftCHP

instance MonadCHP m => MonadCHP (IdentityT m) where
  liftCHP = lift . liftCHP

instance MonadCHP m => MonadCHP (MaybeT m) where
  liftCHP = lift . liftCHP

instance MonadCHP m => MonadCHP (ContT r m) where
  liftCHP = lift . liftCHP

instance MonadIO CHPTest where
  liftIO = liftCHP . liftIO

instance MonadIO Composed where
  liftIO = liftCHP . liftIO