luau/prototyping/PrettyPrinter.agda
Alan Jeffrey 041838a942
Prototyping a small subset of Luau in Agda (#350)
* First cut reading JSON into an Agda representation of Luau syntax
2022-02-08 18:26:58 -06:00

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module PrettyPrinter where
open import Agda.Builtin.IO using (IO)
open import Agda.Builtin.Int using (pos)
open import Agda.Builtin.Unit using ()
open import FFI.IO using (getContents; putStrLn; _>>=_; _>>_)
open import FFI.Data.Aeson using (Value; eitherDecode)
open import FFI.Data.Either using (Left; Right)
open import FFI.Data.String using (String; _++_)
open import FFI.Data.Text.Encoding using (encodeUtf8)
open import FFI.System.Exit using (exitWith; ExitFailure)
open import Luau.Syntax using (Block)
open import Luau.Syntax.FromJSON using (blockFromJSON)
open import Luau.Syntax.ToString using (blockToString)
runBlock : Block IO
runBlock block = putStrLn (blockToString block)
runJSON : Value IO
runJSON value with blockFromJSON(value)
runJSON value | (Left err) = putStrLn ("Luau error: " ++ err) >> exitWith (ExitFailure (pos 1))
runJSON value | (Right block) = runBlock block
runString : String IO
runString txt with eitherDecode (encodeUtf8 txt)
runString txt | (Left err) = putStrLn ("JSON error: " ++ err) >> exitWith (ExitFailure (pos 1))
runString txt | (Right value) = runJSON value
main : IO
main = getContents >>= runString