21 lines
498 B
Haskell
21 lines
498 B
Haskell
module Main where
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import Control.Monad (forever)
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import System.IO (hFlush, stdout)
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import Text.Parsec (parse)
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import UntypedLambdaCalculus (eval, canonym)
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import UntypedLambdaCalculus.Parser (expr)
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prompt :: String -> IO String
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prompt text = do
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putStr text
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hFlush stdout
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getLine
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main :: IO ()
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main = forever $ do
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expr <- parse expr "stdin" <$> prompt ">> "
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case expr of
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Left parseError -> putStrLn $ "Parse error: " ++ show parseError
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Right expr -> print $ eval $ canonym expr
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