111 lines
3.1 KiB
Haskell
111 lines
3.1 KiB
Haskell
|
{-# LANGUAGE GeneralizedNewtypeDeriving, MultiParamTypeClasses, RankNTypes, TypeFamilies #-}
|
||
|
|
module Language.Haskell.GhcMod.Monad (
|
||
|
|
GhcMod
|
||
|
|
, GhcModEnv(..)
|
||
|
|
, GhcModWriter
|
||
|
|
, GhcModState(..)
|
||
|
|
, runGhcMod'
|
||
|
|
, runGhcMod
|
||
|
|
, toGhcMod
|
||
|
|
, module Control.Monad.Reader.Class
|
||
|
|
, module Control.Monad.Writer.Class
|
||
|
|
, module Control.Monad.State.Class
|
||
|
|
) where
|
||
|
|
|
||
|
|
import Language.Haskell.GhcMod.Types
|
||
|
|
import Language.Haskell.GhcMod.Cradle
|
||
|
|
import Language.Haskell.GhcMod.GHCApi
|
||
|
|
|
||
|
|
import GHC
|
||
|
|
import GHC.Paths (libdir)
|
||
|
|
import GhcMonad
|
||
|
|
import Exception
|
||
|
|
import MonadUtils
|
||
|
|
import DynFlags
|
||
|
|
|
||
|
|
import Data.IORef (IORef, readIORef, writeIORef, newIORef)
|
||
|
|
|
||
|
|
import Control.Monad (liftM)
|
||
|
|
import Control.Monad.Base (MonadBase,liftBase)
|
||
|
|
import Control.Monad.Trans.RWS.Lazy (RWST,runRWST)
|
||
|
|
import Control.Monad.Trans.Control (MonadBaseControl(..), StM, liftBaseWith
|
||
|
|
, control, liftBaseOp, liftBaseOp_)
|
||
|
|
import Control.Monad.Reader.Class
|
||
|
|
import Control.Monad.Writer.Class
|
||
|
|
import Control.Monad.State.Class
|
||
|
|
|
||
|
|
data GhcModEnv = GhcModEnv {
|
||
|
|
gmGhcSession :: !(IORef HscEnv)
|
||
|
|
, gmOptions :: Options
|
||
|
|
, gmCradle :: Cradle
|
||
|
|
}
|
||
|
|
|
||
|
|
data GhcModState = GhcModState
|
||
|
|
|
||
|
|
defaultState :: GhcModState
|
||
|
|
defaultState = GhcModState
|
||
|
|
|
||
|
|
type GhcModWriter = ()
|
||
|
|
|
||
|
|
newtype GhcMod a = GhcMod {
|
||
|
|
unGhcMod :: RWST GhcModEnv GhcModWriter GhcModState IO a }
|
||
|
|
deriving (Functor,
|
||
|
|
Applicative,
|
||
|
|
Monad,
|
||
|
|
MonadIO,
|
||
|
|
MonadReader GhcModEnv,
|
||
|
|
MonadWriter GhcModWriter,
|
||
|
|
MonadState GhcModState)
|
||
|
|
|
||
|
|
runGhcMod' :: GhcModEnv
|
||
|
|
-> GhcModState
|
||
|
|
-> GhcMod a
|
||
|
|
-> IO (a,(GhcModState, GhcModWriter))
|
||
|
|
runGhcMod' r s a = do
|
||
|
|
(a', s',w) <- runRWST (unGhcMod $ initGhcMonad (Just libdir) >> a) r s
|
||
|
|
return (a',(s',w))
|
||
|
|
|
||
|
|
runGhcMod :: Options -> GhcMod a -> IO a
|
||
|
|
runGhcMod opt a = do
|
||
|
|
session <- newIORef (error "empty session")
|
||
|
|
cradle <- findCradle
|
||
|
|
let env = GhcModEnv { gmGhcSession = session
|
||
|
|
, gmOptions = opt
|
||
|
|
, gmCradle = cradle }
|
||
|
|
fst <$> runGhcMod' env defaultState (a' cradle)
|
||
|
|
where
|
||
|
|
a' cradle = (toGhcMod $ initializeFlagsWithCradle opt cradle) >> a
|
||
|
|
|
||
|
|
toGhcMod :: Ghc a -> GhcMod a
|
||
|
|
toGhcMod a = do
|
||
|
|
s <- gmGhcSession <$> ask
|
||
|
|
liftIO $ unGhc a $ Session s
|
||
|
|
|
||
|
|
instance MonadBase IO GhcMod where
|
||
|
|
liftBase = GhcMod . liftBase
|
||
|
|
|
||
|
|
instance MonadBaseControl IO GhcMod where
|
||
|
|
newtype StM GhcMod a = StGhcMod {
|
||
|
|
unStGhcMod :: StM (RWST GhcModEnv () GhcModState IO) a }
|
||
|
|
|
||
|
|
liftBaseWith f = GhcMod . liftBaseWith $ \runInBase ->
|
||
|
|
f $ liftM StGhcMod . runInBase . unGhcMod
|
||
|
|
|
||
|
|
restoreM = GhcMod . restoreM . unStGhcMod
|
||
|
|
{-# INLINE liftBaseWith #-}
|
||
|
|
{-# INLINE restoreM #-}
|
||
|
|
|
||
|
|
instance GhcMonad GhcMod where
|
||
|
|
getSession = liftIO . readIORef . gmGhcSession =<< ask
|
||
|
|
setSession a = liftIO . flip writeIORef a . gmGhcSession =<< ask
|
||
|
|
|
||
|
|
instance HasDynFlags GhcMod where
|
||
|
|
getDynFlags = getSessionDynFlags
|
||
|
|
|
||
|
|
instance ExceptionMonad GhcMod where
|
||
|
|
gcatch act handler = control $ \run ->
|
||
|
|
run act `gcatch` (run . handler)
|
||
|
|
|
||
|
|
gmask = liftBaseOp gmask . liftRestore
|
||
|
|
where liftRestore f r = f $ liftBaseOp_ r
|