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

33 lines
1.2 KiB
Agda
Raw Blame History

This file contains ambiguous Unicode characters

This file contains Unicode characters that might be confused with other characters. If you think that this is intentional, you can safely ignore this warning. Use the Escape button to reveal them.

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