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module Main where
import Control.Monad
import Data.Either
import System.Environment
import System.Exit
import Codegen
import Parser
import PShow
fromLeft :: Either a b -> a
fromLeft (Left a) = a
fromLeft (Right _) = error "Either is not a Left"
fromRight :: Either a b -> b
fromRight (Right b) = b
fromRight (Left _) = error "Either is not a Right"
dieShow :: (Show a) => a -> IO ()
dieShow = die . show
main :: IO ()
main = do
args <- getArgs
when (length args /= 1) $ die "Pass NL file name as a command-line parameter"
let fname = args !! 0
parseResult <- (\file -> parseProgram file fname) <$> readFile fname
when (isLeft parseResult) $ dieShow $ fromLeft parseResult
let ast = fromRight parseResult
pprint ast
either die print $ codegen ast "Module" fname
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