lexi-lambda/freer-simple
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This commit is contained in:
Matej Kollar 2017-03-03 16:32:05 +01:00
parent f21080d0ca
commit c7170f2f89
1 changed files with 8 additions and 8 deletions
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16
examples/src/Console.hs
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@ -17,9 +17,9 @@ import Control.Monad.Freer.Internal
-- Effect Model --
-------------------------------------------------------------------------------
data Console s where
PutStrLn :: String -> Console ()
GetLine :: Console String
ExitSuccess :: Console ()
PutStrLn :: String -> Console ()
GetLine :: Console String
ExitSuccess :: Console ()
putStrLn' :: Member Console r => String -> Eff r ()
putStrLn' = send . PutStrLn
@ -36,17 +36,17 @@ exitSuccess' = send ExitSuccess
runConsole :: Eff '[Console, IO] w -> IO w
runConsole req = runM (handleRelay pure go req)
where
go :: Console v -> Arr '[IO] v w -> Eff '[IO] w
go (PutStrLn msg) q = send (putStrLn msg) >>= q
go GetLine q = send getLine >>= q
go ExitSuccess q = send exitSuccess >>= q
go :: Console v -> Arr '[IO] v w -> Eff '[IO] w
go (PutStrLn msg) q = send (putStrLn msg) >>= q
go GetLine q = send getLine >>= q
go ExitSuccess q = send exitSuccess >>= q
-------------------------------------------------------------------------------
-- Pure Interpreter Simple --
-------------------------------------------------------------------------------
runConsolePure :: [String] -> Eff '[Console] w -> [String]
runConsolePure inputs req =
reverse . snd $ run (handleRelayS (inputs, []) (\s _ -> pure s) go req)
reverse . snd $ run (handleRelayS (inputs, []) (\s _ -> pure s) go req)
where
go :: ([String], [String])
-> Console v