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a972778eab
They don't all pass yet, for minor reasons. Coming shortly... Unfortunately the startup overhead for chez is really noticeable here!
50 lines
1.4 KiB
Idris
50 lines
1.4 KiB
Idris
module StoreL
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import Control.App
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import Control.App.Console
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data Access = LoggedOut | LoggedIn
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data Store : Access -> Type where
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MkStore : (secret : String) -> Store a
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interface StoreI e where
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connect : (1 prog : (1 d : Store LoggedOut) ->
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App {l} e ()) -> App {l} e ()
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disconnect : (1 d : Store LoggedOut) -> App {l} e ()
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Has [Console] e => StoreI e where
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connect f
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= let (>>=) = bindL in
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do putStrLn "Connected"
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f (MkStore "xyzzy")
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disconnect (MkStore _)
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= do putStrLn "Disconnected"
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pure ()
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login : (1 s : Store LoggedOut) -> (password : String) ->
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Res Bool (\ok => Store (if ok then LoggedIn else LoggedOut))
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login (MkStore secret) password
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= if password == "Mornington Crescent"
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then True @@ MkStore secret
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else False @@ MkStore secret
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logout : (1 s : Store LoggedIn) -> Store LoggedOut
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logout (MkStore secret) = MkStore secret
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storeProg : Has [Console, StoreI] e => App e ()
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storeProg
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= let (>>=) = bindL in
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do putStr "Password: "
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password <- Console.getStr
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connect $ \s =>
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do let True @@ s = login s password
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| False @@ s => do putStrLn "Incorrect password"
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disconnect s
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putStrLn "Door opened"
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let s = logout s
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putStrLn "Door closed"
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disconnect s
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foo : IO ()
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foo = run storeProg
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