69 lines
2.4 KiB
Haskell
69 lines
2.4 KiB
Haskell
-- ghc-mod: Happy Haskell Hacking
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-- Copyright (C) 2015,2016 Daniel Gröber <dxld ÄT darkboxed DOT org>
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--
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-- This program is free software: you can redistribute it and/or modify
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-- it under the terms of the GNU Affero General Public License as published by
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-- the Free Software Foundation, either version 3 of the License, or
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-- (at your option) any later version.
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--
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-- This program is distributed in the hope that it will be useful,
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-- but WITHOUT ANY WARRANTY; without even the implied warranty of
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-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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-- GNU Affero General Public License for more details.
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--
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-- You should have received a copy of the GNU Affero General Public License
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-- along with this program. If not, see <http://www.gnu.org/licenses/>.
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{-# LANGUAGE GeneralizedNewtypeDeriving, StandaloneDeriving #-}
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{-# LANGUAGE FlexibleInstances, UndecidableInstances #-}
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module Language.Haskell.GhcMod.Monad.Env where
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import Language.Haskell.GhcMod.Types
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import Language.Haskell.GhcMod.Monad.Newtypes
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import Control.Monad
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import Control.Monad.Trans.Journal (JournalT)
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import Control.Monad.State.Strict (StateT(..))
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import Control.Monad.Error (ErrorT(..))
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import Control.Monad.Reader.Class
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import Control.Monad.Trans.Class (MonadTrans(..))
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import Prelude
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class Monad m => GmEnv m where
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gmeAsk :: m GhcModEnv
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gmeAsk = gmeReader id
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gmeReader :: (GhcModEnv -> a) -> m a
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gmeReader f = f `liftM` gmeAsk
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gmeLocal :: (GhcModEnv -> GhcModEnv) -> m a -> m a
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{-# MINIMAL (gmeAsk | gmeReader), gmeLocal #-}
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instance Monad m => GmEnv (GmT m) where
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gmeAsk = GmT ask
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gmeReader = GmT . reader
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gmeLocal f a = GmT $ local f (unGmT a)
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instance GmEnv m => GmEnv (GmOutT m) where
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gmeAsk = lift gmeAsk
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gmeReader = lift . gmeReader
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gmeLocal f ma = gmLiftWithInner (\run -> gmeLocal f (run ma))
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instance GmEnv m => GmEnv (StateT s m) where
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gmeAsk = lift gmeAsk
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gmeReader = lift . gmeReader
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gmeLocal f ma = gmLiftWithInner (\run -> gmeLocal f (run ma))
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instance GmEnv m => GmEnv (JournalT GhcModLog m) where
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gmeAsk = lift gmeAsk
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gmeReader = lift . gmeReader
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gmeLocal f ma = gmLiftWithInner (\run -> gmeLocal f (run ma))
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instance GmEnv m => GmEnv (ErrorT GhcModError m) where
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gmeAsk = lift gmeAsk
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gmeReader = lift . gmeReader
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gmeLocal f ma = gmLiftWithInner (\run -> gmeLocal f (run ma))
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deriving instance (Monad m, GmEnv (GhcModT m)) => GmEnv (GmlT m)
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