{-# LANGUAGE RankNTypes #-}
module Data.Conduit.Foldl where
import Data.Conduit
import Control.Monad.Trans.Class (lift)
import qualified Data.Conduit.List as CL
sinkFold :: Monad m => (x -> a -> x) -> x -> (x -> b) -> ConduitT a o m b
sinkFold :: (x -> a -> x) -> x -> (x -> b) -> ConduitT a o m b
sinkFold x -> a -> x
combine x
seed x -> b
extract = (x -> b) -> ConduitT a o m x -> ConduitT a o m b
forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
fmap x -> b
extract ((x -> a -> x) -> x -> ConduitT a o m x
forall (m :: * -> *) b a o.
Monad m =>
(b -> a -> b) -> b -> ConduitT a o m b
CL.fold x -> a -> x
combine x
seed)
sinkFoldM :: Monad m => (x -> a -> m x) -> m x -> (x -> m b) -> ConduitT a o m b
sinkFoldM :: (x -> a -> m x) -> m x -> (x -> m b) -> ConduitT a o m b
sinkFoldM x -> a -> m x
combine m x
seed x -> m b
extract =
m b -> ConduitT a o m b
forall (t :: (* -> *) -> * -> *) (m :: * -> *) a.
(MonadTrans t, Monad m) =>
m a -> t m a
lift (m b -> ConduitT a o m b) -> (x -> m b) -> x -> ConduitT a o m b
forall b c a. (b -> c) -> (a -> b) -> a -> c
. x -> m b
extract (x -> ConduitT a o m b) -> ConduitT a o m x -> ConduitT a o m b
forall (m :: * -> *) a b. Monad m => (a -> m b) -> m a -> m b
=<< (x -> a -> m x) -> x -> ConduitT a o m x
forall (m :: * -> *) b a o.
Monad m =>
(b -> a -> m b) -> b -> ConduitT a o m b
CL.foldM x -> a -> m x
combine (x -> ConduitT a o m x) -> ConduitT a o m x -> ConduitT a o m x
forall (m :: * -> *) a b. Monad m => (a -> m b) -> m a -> m b
=<< m x -> ConduitT a o m x
forall (t :: (* -> *) -> * -> *) (m :: * -> *) a.
(MonadTrans t, Monad m) =>
m a -> t m a
lift m x
seed