pipes-io (empty) → 0.1
raw patch · 5 files changed
+388/−0 lines, 5 filesdep +basedep +hspecdep +pipessetup-changed
Dependencies added: base, hspec, pipes, pipes-io, pipes-parse
Files
- LICENSE +202/−0
- Pipes/IOStream.hs +96/−0
- Setup.hs +2/−0
- pipes-io.cabal +41/−0
- tests/Main.hs +47/−0
+ LICENSE view
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+ Pipes/IOStream.hs view
@@ -0,0 +1,96 @@+{-# Language LambdaCase, Rank2Types #-}+module Pipes.IOStream (+ -- * IStream and OStream+ IStream,+ OStream,+ -- * Convert between IOStreams and pipes+ mkIStream,+ mkOStream,+ fromIStream,+ fromOStream,+ -- * Reading+ readOne,+ readWith,+ -- * Wrapping+ wrapIStream,+ -- * Writting+ write,+ writeProducer,+ -- * Detecting end of stream+ isEnded,+ -- * Connect and resume for consumer+ (>->+),++ -- * Re-exports+ Producer,+ Consumer,+ Parser+) where++import Control.Monad+import Data.IORef+import Pipes+import Pipes.Internal+import Pipes.Parse++newtype IStream a = IS (IORef (Producer a IO ()))++newtype OStream a = OS (IORef (Consumer a IO ()))++mkIStream :: Producer a IO () -> IO (IStream a)+mkIStream p = liftM IS $ newIORef p++mkOStream :: Consumer a IO () -> IO (OStream a)+mkOStream c = liftM OS $ newIORef c++fromIStream :: IStream a -> IO (Producer a IO ())+fromIStream (IS rp) = readIORef rp++fromOStream :: OStream a -> IO (Consumer a IO ())+fromOStream (OS rc) = readIORef rc++wrapIStream :: IStream a -> (Producer a IO () -> Producer b IO ()) ->+ IO (IStream b)+wrapIStream i f = fromIStream i >>= mkIStream . f++readOne :: IStream a -> IO (Maybe a)+readOne (IS rp) = do+ p <- readIORef rp+ next p >>= \case+ Left () -> return Nothing+ Right (a, p') -> writeIORef rp p' >> return (Just a)++readWith :: IStream a -> Parser a IO r -> IO r+readWith (IS rp) parser = do+ p <- readIORef rp+ (r, p') <- runStateT parser p+ writeIORef rp p'+ return r++write :: OStream a -> a -> IO ()+write o a = writeProducer o (yield a)++writeProducer :: OStream a -> Producer a IO () -> IO ()+writeProducer (OS rc) p = readIORef rc >>= (p >->+) >>= writeIORef rc++isEnded :: OStream a -> IO Bool+isEnded (OS rc) = readIORef rc >>= \case+ Pure _ -> return True+ _ -> return False++{- | Pairs each await in the consumer with an yield in the producer. Returns+remaining consumer. -}+(>->+) :: Monad m => Producer a m x -> Consumer a m y -> m (Consumer a m y)+p0 >->+ c0 = go p0 c0+ where+ go p c = case c of+ Request _ f -> go1 p+ where+ go1 = \case+ Respond a g -> g () `go` f a+ M p' -> go1 =<< p'+ Pure _ -> return c+ Request v _ -> closed v+ M c' -> go p =<< c'+ Pure _ -> return c+ Respond v _ -> closed v
+ Setup.hs view
@@ -0,0 +1,2 @@+import Distribution.Simple+main = defaultMain
+ pipes-io.cabal view
@@ -0,0 +1,41 @@+name: pipes-io+version: 0.1+synopsis: Stateful IO streams based on pipes+category: Control, Pipes+author: Yin Guanhao+maintainer: Yin Guanhao <yinguanhao@gmail.com>+copyright: Copyright 2016 Yin Guanhao <yinguanhao@gmail.com>+license: Apache-2.0+license-file: LICENSE+build-type: Simple+cabal-version: >=1.10+description:+ `pipes-io` allows you to use pipes and `Parser`s more easily in the+ IO monad, providing a interface similar to that of `io-streams`.+tested-with: GHC == 7.10.3, GHC == 8.0.1++source-repository head+ type: git+ location: https://github.com/yinguanhao/pipes-io++library+ exposed-modules:+ Pipes.IOStream+ build-depends:+ base >= 4.8 && < 5,+ pipes >= 4.1.9 && < 4.2,+ pipes-parse >= 3 && < 3.1+ ghc-options: -Wall+ default-language: Haskell2010++test-suite tests+ type: exitcode-stdio-1.0+ hs-source-dirs: tests+ main-is: Main.hs+ default-language: Haskell2010+ ghc-options: -Wall+ build-depends:+ base,+ pipes-io,+ pipes,+ hspec
+ tests/Main.hs view
@@ -0,0 +1,47 @@+module Main(main) where++import Test.Hspec++import Data.IORef++import Pipes+import Pipes.IOStream++main :: IO ()+main = hspec $ do+ describe ">->+" $ do+ it "should return remaining consumer" $ do+ r <- newIORef []+ let c = consumerPrepend r++ c1 <- yield 0 >->+ c+ r `shouldRef` [(0, 0)]++ c2 <- (yield 3 >> yield 7) >->+ c1+ r `shouldRef` [(2, 7), (1, 3), (0, 0)]++ runEffect $ (yield 23 >> yield 37) >-> c2+ r `shouldRef` [(4, 37), (3, 23), (2, 7), (1, 3), (0, 0)]++ describe "writeProducer" $ do+ it "should work" $ do+ r <- newIORef []+ let c = consumerPrepend r+ o <- mkOStream c++ writeProducer o $ yield 3 >> yield 7+ r `shouldRef` [(1, 7), (0, 3)]++ writeProducer o $ yield 11 >> yield 13+ r `shouldRef` [(3, 13), (2, 11), (1, 7), (0, 3)]++consumerPrepend :: IORef [(Int, Int)] -> Consumer Int IO ()+consumerPrepend ref = go 0+ where+ go n = do+ x <- await+ lift $ modifyIORef' ref ((n, x):)+ go (n + 1)++shouldRef :: (Show a, Eq a) => IORef a -> a -> Expectation+shouldRef r x = readIORef r `shouldReturn` x