Created
September 19, 2021 00:18
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| -- Notes on how to wrap InputT over StateT to maintain the environment around a language repl. | |
| type HaskellLineT = InputT (StateT Env IO) () | |
| runScriptInteractive = runStateT (runInputT defaultSettings loop) (initEnv Nothing) | |
| where | |
| loop :: HaskellLineT | |
| loop = do | |
| minput <- getInputLine "%" | |
| when (isNothing minput) loop | |
| env <- lift get | |
| let lex_result = scanner (fromJust minput) | |
| case lex_result of | |
| Right lex -> do | |
| let ast = P.parse loxProgram "" lex | |
| case ast of | |
| Right ast' -> do | |
| (env', msg) <- liftIO $ interpretProgram ast' env | |
| when (isJust msg) $ liftIO $ print msg | |
| lift $ put env' | |
| loop | |
| Left e -> do | |
| liftIO $ print $ "Scanner error" <> show e | |
| loop | |
| Left e -> do | |
| liftIO $ print $ "Lexer error" <> show e | |
| loop | |
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