Data.Conduit.Lift

conduit-1.2.6: Streaming data processing library.

Safe Haskell | Safe
Language | Haskell98

Data.Conduit.Lift

Contents

- ErrorT
- CatchT
- MaybeT
- ReaderT
- StateT, lazy
  - Strict
- WriterT, lazy
  - Strict
- RWST, lazy
  - Strict
- Utilities

Description

Allow monad transformers to be run/eval/exec in a section of conduit rather then needing to run across the whole conduit. The circumvents many of the problems with breaking the monad transformer laws. For more information, see the announcement blog post: http://www.yesodweb.com/blog/2014/01/conduit-transformer-exception

This module was added in conduit 1.0.11.

Synopsis

- errorC :: (Monad m, Monad (t (ErrorT e m)), MonadTrans t, Error e, MFunctor t) => t m (Either e b) -> t (ErrorT e m) b
- runErrorC :: (Monad m, Error e) => ConduitM i o (ErrorT e m) r -> ConduitM i o m (Either e r)
- catchErrorC :: (Monad m, Error e) => ConduitM i o (ErrorT e m) r -> (e -> ConduitM i o (ErrorT e m) r) -> ConduitM i o (ErrorT e m) r
- runCatchC :: Monad m => ConduitM i o (CatchT m) r -> ConduitM i o m (Either SomeException r)
- catchCatchC :: Monad m => ConduitM i o (CatchT m) r -> (SomeException -> ConduitM i o (CatchT m) r) -> ConduitM i o (CatchT m) r
- maybeC :: (Monad m, Monad (t (MaybeT m)), MonadTrans t, MFunctor t) => t m (Maybe b) -> t (MaybeT m) b
- runMaybeC :: Monad m => ConduitM i o (MaybeT m) r -> ConduitM i o m (Maybe r)
- readerC :: (Monad m, Monad (t1 (ReaderT t m)), MonadTrans t1, MFunctor t1) => (t -> t1 m b) -> t1 (ReaderT t m) b
- runReaderC :: Monad m => r -> ConduitM i o (ReaderT r m) res -> ConduitM i o m res
- stateLC :: (Monad m, Monad (t1 (StateT t m)), MonadTrans t1, MFunctor t1) => (t -> t1 m (b, t)) -> t1 (StateT t m) b
- runStateLC :: Monad m => s -> ConduitM i o (StateT s m) r -> ConduitM i o m (r, s)
- evalStateLC :: Monad m => s -> ConduitM i o (StateT s m) r -> ConduitM i o m r
- execStateLC :: Monad m => s -> ConduitM i o (StateT s m) r -> ConduitM i o m s
- stateC :: (Monad m, Monad (t1 (StateT t m)), MonadTrans t1, MFunctor t1) => (t -> t1 m (b, t)) -> t1 (StateT t m) b
- runStateC :: Monad m => s -> ConduitM i o (StateT s m) r -> ConduitM i o m (r, s)
- evalStateC :: Monad m => s -> ConduitM i o (StateT s m) r -> ConduitM i o m r
- execStateC :: Monad m => s -> ConduitM i o (StateT s m) r -> ConduitM i o m s
- writerLC :: (Monad m, Monad (t (WriterT w m)), MonadTrans t, Monoid w, MFunctor t) => t m (b, w) -> t (WriterT w m) b
- runWriterLC :: (Monad m, Monoid w) => ConduitM i o (WriterT w m) r -> ConduitM i o m (r, w)
- execWriterLC :: (Monad m, Monoid w) => ConduitM i o (WriterT w m) r -> ConduitM i o m w
- writerC :: (Monad m, Monad (t (WriterT w m)), MonadTrans t, Monoid w, MFunctor t) => t m (b, w) -> t (WriterT w m) b
- runWriterC :: (Monad m, Monoid w) => ConduitM i o (WriterT w m) r -> ConduitM i o m (r, w)
- execWriterC :: (Monad m, Monoid w) => ConduitM i o (WriterT w m) r -> ConduitM i o m w
- rwsLC :: (Monad m, Monad (t1 (RWST t w t2 m)), MonadTrans t1, Monoid w, MFunctor t1) => (t -> t2 -> t1 m (b, t2, w)) -> t1 (RWST t w t2 m) b
- runRWSLC :: (Monad m, Monoid w) => r -> s -> ConduitM i o (RWST r w s m) res -> ConduitM i o m (res, s, w)
- evalRWSLC :: (Monad m, Monoid w) => r -> s -> ConduitM i o (RWST r w s m) res -> ConduitM i o m (res, w)
- execRWSLC :: (Monad m, Monoid w) => r -> s -> ConduitM i o (RWST r w s m) res -> ConduitM i o m (s, w)
- rwsC :: (Monad m, Monad (t1 (RWST t w t2 m)), MonadTrans t1, Monoid w, MFunctor t1) => (t -> t2 -> t1 m (b, t2, w)) -> t1 (RWST t w t2 m) b
- runRWSC :: (Monad m, Monoid w) => r -> s -> ConduitM i o (RWST r w s m) res -> ConduitM i o m (res, s, w)
- evalRWSC :: (Monad m, Monoid w) => r -> s -> ConduitM i o (RWST r w s m) res -> ConduitM i o m (res, w)
- execRWSC :: (Monad m, Monoid w) => r -> s -> ConduitM i o (RWST r w s m) res -> ConduitM i o m (s, w)
- distribute :: (Monad (t (ConduitM b o m)), Monad m, Monad (t m), MonadTrans t, MFunctor t) => ConduitM b o (t m) () -> t (ConduitM b o m) ()

# ErrorT

errorC :: (Monad m, Monad (t (ErrorT e m)), MonadTrans t, Error e, MFunctor t) => t m (Either e b) -> t (ErrorT e m) b

Wrap the base monad in `ErrorT`

Since 1.0.11

runErrorC :: (Monad m, Error e) => ConduitM i o (ErrorT e m) r -> ConduitM i o m (Either e r)

Run `ErrorT` in the base monad

Since 1.0.11

catchErrorC :: (Monad m, Error e) => ConduitM i o (ErrorT e m) r -> (e -> ConduitM i o (ErrorT e m) r) -> ConduitM i o (ErrorT e m) r

Catch an error in the base monad

Since 1.0.11

# CatchT

runCatchC :: Monad m => ConduitM i o (CatchT m) r -> ConduitM i o m (Either SomeException r)

Run `CatchT` in the base monad

Since 1.1.0

catchCatchC :: Monad m => ConduitM i o (CatchT m) r -> (SomeException -> ConduitM i o (CatchT m) r) -> ConduitM i o (CatchT m) r

Catch an exception in the base monad

Since 1.1.0

# MaybeT

maybeC :: (Monad m, Monad (t (MaybeT m)), MonadTrans t, MFunctor t) => t m (Maybe b) -> t (MaybeT m) b

Wrap the base monad in `MaybeT`

Since 1.0.11

runMaybeC :: Monad m => ConduitM i o (MaybeT m) r -> ConduitM i o m (Maybe r)

Run `MaybeT` in the base monad

Since 1.0.11

# ReaderT

readerC :: (Monad m, Monad (t1 (ReaderT t m)), MonadTrans t1, MFunctor t1) => (t -> t1 m b) -> t1 (ReaderT t m) b

Wrap the base monad in `ReaderT`

Since 1.0.11

runReaderC :: Monad m => r -> ConduitM i o (ReaderT r m) res -> ConduitM i o m res

Run `ReaderT` in the base monad

Since 1.0.11

# StateT, lazy

stateLC :: (Monad m, Monad (t1 (StateT t m)), MonadTrans t1, MFunctor t1) => (t -> t1 m (b, t)) -> t1 (StateT t m) b

Wrap the base monad in `StateT`

Since 1.0.11

runStateLC :: Monad m => s -> ConduitM i o (StateT s m) r -> ConduitM i o m (r, s)

Run `StateT` in the base monad

Since 1.0.11

evalStateLC :: Monad m => s -> ConduitM i o (StateT s m) r -> ConduitM i o m r

Evaluate `StateT` in the base monad

Since 1.0.11

execStateLC :: Monad m => s -> ConduitM i o (StateT s m) r -> ConduitM i o m s

Execute `StateT` in the base monad

Since 1.0.11

## Strict

stateC :: (Monad m, Monad (t1 (StateT t m)), MonadTrans t1, MFunctor t1) => (t -> t1 m (b, t)) -> t1 (StateT t m) b

Wrap the base monad in `StateT`

Since 1.0.11

runStateC :: Monad m => s -> ConduitM i o (StateT s m) r -> ConduitM i o m (r, s)

Run `StateT` in the base monad

Since 1.0.11

evalStateC :: Monad m => s -> ConduitM i o (StateT s m) r -> ConduitM i o m r

Evaluate `StateT` in the base monad

Since 1.0.11

execStateC :: Monad m => s -> ConduitM i o (StateT s m) r -> ConduitM i o m s

Execute `StateT` in the base monad

Since 1.0.11

# WriterT, lazy

writerLC :: (Monad m, Monad (t (WriterT w m)), MonadTrans t, Monoid w, MFunctor t) => t m (b, w) -> t (WriterT w m) b

Wrap the base monad in `WriterT`

Since 1.0.11

runWriterLC :: (Monad m, Monoid w) => ConduitM i o (WriterT w m) r -> ConduitM i o m (r, w)

Run `WriterT` in the base monad

Since 1.0.11

execWriterLC :: (Monad m, Monoid w) => ConduitM i o (WriterT w m) r -> ConduitM i o m w

Execute `WriterT` in the base monad

Since 1.0.11

## Strict

writerC :: (Monad m, Monad (t (WriterT w m)), MonadTrans t, Monoid w, MFunctor t) => t m (b, w) -> t (WriterT w m) b

Wrap the base monad in `WriterT`

Since 1.0.11

runWriterC :: (Monad m, Monoid w) => ConduitM i o (WriterT w m) r -> ConduitM i o m (r, w)

Run `WriterT` in the base monad

Since 1.0.11

execWriterC :: (Monad m, Monoid w) => ConduitM i o (WriterT w m) r -> ConduitM i o m w

Execute `WriterT` in the base monad

Since 1.0.11

# RWST, lazy

rwsLC :: (Monad m, Monad (t1 (RWST t w t2 m)), MonadTrans t1, Monoid w, MFunctor t1) => (t -> t2 -> t1 m (b, t2, w)) -> t1 (RWST t w t2 m) b

Wrap the base monad in `RWST`

Since 1.0.11

runRWSLC :: (Monad m, Monoid w) => r -> s -> ConduitM i o (RWST r w s m) res -> ConduitM i o m (res, s, w)

Run `RWST` in the base monad

Since 1.0.11

evalRWSLC :: (Monad m, Monoid w) => r -> s -> ConduitM i o (RWST r w s m) res -> ConduitM i o m (res, w)

Evaluate `RWST` in the base monad

Since 1.0.11

execRWSLC :: (Monad m, Monoid w) => r -> s -> ConduitM i o (RWST r w s m) res -> ConduitM i o m (s, w)

Execute `RWST` in the base monad

Since 1.0.11

## Strict

rwsC :: (Monad m, Monad (t1 (RWST t w t2 m)), MonadTrans t1, Monoid w, MFunctor t1) => (t -> t2 -> t1 m (b, t2, w)) -> t1 (RWST t w t2 m) b

Wrap the base monad in `RWST`

Since 1.0.11

runRWSC :: (Monad m, Monoid w) => r -> s -> ConduitM i o (RWST r w s m) res -> ConduitM i o m (res, s, w)

Run `RWST` in the base monad

Since 1.0.11

evalRWSC :: (Monad m, Monoid w) => r -> s -> ConduitM i o (RWST r w s m) res -> ConduitM i o m (res, w)

Evaluate `RWST` in the base monad

Since 1.0.11

execRWSC :: (Monad m, Monoid w) => r -> s -> ConduitM i o (RWST r w s m) res -> ConduitM i o m (s, w)

Execute `RWST` in the base monad

Since 1.0.11

# Utilities

distribute :: (Monad (t (ConduitM b o m)), Monad m, Monad (t m), MonadTrans t, MFunctor t) => ConduitM b o (t m) () -> t (ConduitM b o m) ()