{-# LANGUAGE FlexibleInstances #-}
{-# LANGUAGE GADTs #-}
{-# LANGUAGE GeneralizedNewtypeDeriving #-}
{-# LANGUAGE MultiParamTypeClasses #-}
{-# LANGUAGE TypeOperators #-}
{-# LANGUAGE UndecidableInstances #-}

-- | A carrier for a 'Fresh' effect, providing access to a monotonically increasing stream of 'Int' values.
--
-- @since 1.0.0.0
module Control.Carrier.Fresh.Strict
( -- * Fresh carrier
  runFresh
, evalFresh
, FreshC(FreshC)
  -- * Fresh effect
, module Control.Effect.Fresh
) where

import Control.Algebra
import Control.Applicative (Alternative)
import Control.Carrier.State.Strict
import Control.Effect.Fresh
import Control.Monad (MonadPlus)
import Control.Monad.Fail as Fail
import Control.Monad.Fix
import Control.Monad.IO.Class
import Control.Monad.Trans.Class

-- | Run a 'Fresh' effect counting up from 0.
--
-- @
-- 'runFresh' n ('pure' a) = 'pure' (n, a)
-- @
-- @
-- 'runFresh' n 'fresh' = 'pure' (n '+' 1, n)
-- @
--
-- @since 0.1.0.0
runFresh :: Int -> FreshC m a -> m (Int, a)
runFresh :: forall (m :: * -> *) a. Int -> FreshC m a -> m (Int, a)
runFresh Int
n (FreshC StateC Int m a
m) = Int -> StateC Int m a -> m (Int, a)
forall s (m :: * -> *) a. s -> StateC s m a -> m (s, a)
runState Int
n StateC Int m a
m
{-# INLINE runFresh #-}

-- | Run a 'Fresh' effect counting up from an initial value, and forgetting the final value.
--
-- @
-- 'evalFresh' n ('pure' a) = 'pure' a
-- @
-- @
-- 'evalFresh' n 'fresh' = 'pure' n
-- @
--
-- @since 1.0.0.0
evalFresh :: Functor m => Int -> FreshC m a -> m a
evalFresh :: forall (m :: * -> *) a. Functor m => Int -> FreshC m a -> m a
evalFresh Int
n (FreshC StateC Int m a
m) = Int -> StateC Int m a -> m a
forall s (m :: * -> *) a. Functor m => s -> StateC s m a -> m a
evalState Int
n StateC Int m a
m
{-# INLINE evalFresh #-}

-- | @since 1.0.0.0
newtype FreshC m a = FreshC { forall (m :: * -> *) a. FreshC m a -> StateC Int m a
runFreshC :: StateC Int m a }
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instance Algebra sig m => Algebra (Fresh :+: sig) (FreshC m) where
  alg :: forall (ctx :: * -> *) (n :: * -> *) a.
Functor ctx =>
Handler ctx n (FreshC m)
-> (:+:) Fresh sig n a -> ctx () -> FreshC m (ctx a)
alg Handler ctx n (FreshC m)
hdl (:+:) Fresh sig n a
sig ctx ()
ctx = StateC Int m (ctx a) -> FreshC m (ctx a)
forall (m :: * -> *) a. StateC Int m a -> FreshC m a
FreshC (StateC Int m (ctx a) -> FreshC m (ctx a))
-> StateC Int m (ctx a) -> FreshC m (ctx a)
forall a b. (a -> b) -> a -> b
$ case (:+:) Fresh sig n a
sig of
    L Fresh n a
Fresh -> (a -> (a, ctx a)) -> StateC Int m (ctx a)
forall s (sig :: (* -> *) -> * -> *) (m :: * -> *) a.
Has (State s) sig m =>
(s -> (s, a)) -> m a
state ((a -> (a, ctx a)) -> StateC Int m (ctx a))
-> (a -> (a, ctx a)) -> StateC Int m (ctx a)
forall a b. (a -> b) -> a -> b
$ \ a
i -> (a
i a -> a -> a
forall a. Num a => a -> a -> a
+ a
1, a
i a -> ctx () -> ctx a
forall a b. a -> ctx b -> ctx a
forall (f :: * -> *) a b. Functor f => a -> f b -> f a
<$ ctx ()
ctx)
    R sig n a
other -> Handler ctx n (StateC Int m)
-> (:+:) (State Int) sig n a -> ctx () -> StateC Int m (ctx a)
forall (ctx :: * -> *) (n :: * -> *) a.
Functor ctx =>
Handler ctx n (StateC Int m)
-> (:+:) (State Int) sig n a -> ctx () -> StateC Int m (ctx a)
forall (sig :: (* -> *) -> * -> *) (m :: * -> *) (ctx :: * -> *)
       (n :: * -> *) a.
(Algebra sig m, Functor ctx) =>
Handler ctx n m -> sig n a -> ctx () -> m (ctx a)
alg (FreshC m (ctx x) -> StateC Int m (ctx x)
forall (m :: * -> *) a. FreshC m a -> StateC Int m a
runFreshC (FreshC m (ctx x) -> StateC Int m (ctx x))
-> (ctx (n x) -> FreshC m (ctx x))
-> ctx (n x)
-> StateC Int m (ctx x)
forall b c a. (b -> c) -> (a -> b) -> a -> c
. ctx (n x) -> FreshC m (ctx x)
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hdl) (sig n a -> (:+:) (State Int) sig n a
forall (f :: (* -> *) -> * -> *) (g :: (* -> *) -> * -> *)
       (m :: * -> *) k.
g m k -> (:+:) f g m k
R sig n a
other) ctx ()
ctx
  {-# INLINE alg #-}