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