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35 lines
999 B
Agda
35 lines
999 B
Agda
module FFI.IO where
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open import Agda.Builtin.IO using (IO)
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open import Agda.Builtin.Unit using (⊤)
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open import Agda.Builtin.String using (String)
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open import FFI.Data.HaskellString using (HaskellString; pack ; unpack)
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infixl 1 _>>=_
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infixl 1 _>>_
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postulate
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return : ∀ {a} {A : Set a} → A → IO A
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_>>=_ : ∀ {a b} {A : Set a} {B : Set b} → IO A → (A → IO B) → IO B
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fmap : ∀ {a b} {A : Set a} {B : Set b} → (A → B) → IO A → IO B
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{-# COMPILE GHC return = \_ _ -> return #-}
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{-# COMPILE GHC _>>=_ = \_ _ _ _ -> (>>=) #-}
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{-# COMPILE GHC fmap = \_ _ _ _ -> fmap #-}
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postulate getHContents : IO HaskellString
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{-# COMPILE GHC getHContents = getContents #-}
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postulate putHStrLn : HaskellString → IO ⊤
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{-# COMPILE GHC putHStrLn = putStrLn #-}
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getContents : IO String
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getContents = fmap pack getHContents
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putStrLn : String → IO ⊤
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putStrLn txt = putHStrLn (unpack txt)
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_>>_ : ∀ {a} {A : Set a} → IO ⊤ → IO A → IO A
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a >> b = a >>= (λ _ → b )
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