{-# LANGUAGE CPP #-}
{-# LANGUAGE DeriveFunctor #-}
{-# LANGUAGE FlexibleContexts #-}
{-# LANGUAGE FlexibleInstances #-}
{-# LANGUAGE GeneralizedNewtypeDeriving #-}
{-# LANGUAGE MultiParamTypeClasses #-}
{-# LANGUAGE RankNTypes #-}
{-# LANGUAGE TypeFamilies #-}
{-# LANGUAGE UndecidableInstances #-}

{-# OPTIONS_GHC -Wno-orphans #-}

module Nix.Fresh where

import           Control.Applicative
import           Control.Monad.Base
import           Control.Monad.Catch
import           Control.Monad.Except
import           Control.Monad.Fail
import           Control.Monad.Reader
import           Control.Monad.Ref
import           Control.Monad.ST
import           Data.Typeable

import           Nix.Var
import           Nix.Thunk

newtype FreshIdT i m a = FreshIdT { FreshIdT i m a -> ReaderT (Var m i) m a
unFreshIdT :: ReaderT (Var m i) m a }
  deriving
    ( a -> FreshIdT i m b -> FreshIdT i m a
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instance MonadTrans (FreshIdT i) where
  lift :: m a -> FreshIdT i m a
lift = ReaderT (Var m i) m a -> FreshIdT i m a
forall i (m :: * -> *) a. ReaderT (Var m i) m a -> FreshIdT i m a
FreshIdT (ReaderT (Var m i) m a -> FreshIdT i m a)
-> (m a -> ReaderT (Var m i) m a) -> m a -> FreshIdT i m a
forall b c a. (b -> c) -> (a -> b) -> a -> c
. m a -> ReaderT (Var m i) m a
forall (t :: (* -> *) -> * -> *) (m :: * -> *) a.
(MonadTrans t, Monad m) =>
m a -> t m a
lift

instance MonadBase b m => MonadBase b (FreshIdT i m) where
  liftBase :: b α -> FreshIdT i m α
liftBase = ReaderT (Var m i) m α -> FreshIdT i m α
forall i (m :: * -> *) a. ReaderT (Var m i) m a -> FreshIdT i m a
FreshIdT (ReaderT (Var m i) m α -> FreshIdT i m α)
-> (b α -> ReaderT (Var m i) m α) -> b α -> FreshIdT i m α
forall b c a. (b -> c) -> (a -> b) -> a -> c
. b α -> ReaderT (Var m i) m α
forall (b :: * -> *) (m :: * -> *) α. MonadBase b m => b α -> m α
liftBase

instance ( MonadVar m
         , Eq i
         , Ord i
         , Show i
         , Enum i
         , Typeable i
         )
         => MonadThunkId (FreshIdT i m) where
  type ThunkId (FreshIdT i m) = i
  freshId :: FreshIdT i m (ThunkId (FreshIdT i m))
freshId = ReaderT (Var m i) m i -> FreshIdT i m (ThunkId (FreshIdT i m))
forall i (m :: * -> *) a. ReaderT (Var m i) m a -> FreshIdT i m a
FreshIdT (ReaderT (Var m i) m i -> FreshIdT i m (ThunkId (FreshIdT i m)))
-> ReaderT (Var m i) m i -> FreshIdT i m (ThunkId (FreshIdT i m))
forall a b. (a -> b) -> a -> b
$ do
    Var m i
v <- ReaderT (Var m i) m (Var m i)
forall r (m :: * -> *). MonadReader r m => m r
ask
    Ref (ReaderT (Var m i) m) i
-> (i -> (i, i)) -> ReaderT (Var m i) m i
forall (m :: * -> *) a b.
MonadAtomicRef m =>
Ref m a -> (a -> (a, b)) -> m b
atomicModifyVar Var m i
Ref (ReaderT (Var m i) m) i
v (\i :: i
i -> (i -> i
forall a. Enum a => a -> a
succ i
i, i
i))

runFreshIdT :: Functor m => Var m i -> FreshIdT i m a -> m a
runFreshIdT :: Var m i -> FreshIdT i m a -> m a
runFreshIdT i :: Var m i
i m :: FreshIdT i m a
m = ReaderT (Var m i) m a -> Var m i -> m a
forall r (m :: * -> *) a. ReaderT r m a -> r -> m a
runReaderT (FreshIdT i m a -> ReaderT (Var m i) m a
forall i (m :: * -> *) a. FreshIdT i m a -> ReaderT (Var m i) m a
unFreshIdT FreshIdT i m a
m) Var m i
i

-- Orphan instance needed by Infer.hs and Lint.hs

-- Since there's no forking, it's automatically atomic.
instance MonadAtomicRef (ST s) where
  atomicModifyRef :: Ref (ST s) a -> (a -> (a, b)) -> ST s b
atomicModifyRef r :: Ref (ST s) a
r f :: a -> (a, b)
f = do
    a
v <- Ref (ST s) a -> ST s a
forall (m :: * -> *) a. MonadRef m => Ref m a -> m a
readRef Ref (ST s) a
r
    let (a :: a
a, b :: b
b) = a -> (a, b)
f a
v
    Ref (ST s) a -> a -> ST s ()
forall (m :: * -> *) a. MonadRef m => Ref m a -> a -> m ()
writeRef Ref (ST s) a
r a
a
    b -> ST s b
forall (m :: * -> *) a. Monad m => a -> m a
return b
b
  atomicModifyRef' :: Ref (ST s) a -> (a -> (a, b)) -> ST s b
atomicModifyRef' r :: Ref (ST s) a
r f :: a -> (a, b)
f = do
    a
v <- Ref (ST s) a -> ST s a
forall (m :: * -> *) a. MonadRef m => Ref m a -> m a
readRef Ref (ST s) a
r
    let (a :: a
a, b :: b
b) = a -> (a, b)
f a
v
    Ref (ST s) a -> a -> ST s ()
forall (m :: * -> *) a. MonadRef m => Ref m a -> a -> m ()
writeRef Ref (ST s) a
r (a -> ST s ()) -> a -> ST s ()
forall a b. (a -> b) -> a -> b
$! a
a
    b -> ST s b
forall (m :: * -> *) a. Monad m => a -> m a
return b
b