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import System.Environment( getArgs )
import System.Console.GetOpt
import Control.Exception( ErrorCall(..), Handler(..), catches )
import Thue.Parser
import Thue.Interpreter
data Flag = LeftInterpret | RightInterpret | RandomInterpret | Version1 | Version2a
deriving (Eq)
options :: [OptDescr Flag]
options =
[ Option ['l'] ["left"] (NoArg LeftInterpret) "Apply rules in a list from left to right"
, Option ['r'] ["right"] (NoArg RightInterpret) "Apply rules in a list from right to left"
, Option ['a'] ["random"] (NoArg RandomInterpret) "Apply rules randomly"
, Option ['1'] ["ver1"] (NoArg Version1) "Use version 1 parser"
, Option ['2'] ["ver2a"] (NoArg Version2a) "Use version 2a parser, with quoted strings and escaped characters" ]
usageString :: String
usageString = "Usage: thue [OPTION..] <program file>"
program :: IO ()
program = do
args <- getArgs
let (actions, nonOptions, errors) = getOpt Permute options args
parse = if (Version2a `elem` actions) then parseThue2a else parseThue
order = if (LeftInterpret `elem` actions)
then Just First
else if (RightInterpret `elem` actions) then Just Last else Nothing
fileContents <- if (length nonOptions /= 1)
then error usageString
else readFile (head nonOptions)
case (parse fileContents) of
Left x -> putStrLn (show x)
Right x -> (thue x order) >>= (putStrLn . show)
main = catches program
[ Handler ((\e -> putStrLn . show $ e) :: ErrorCall -> IO ()) ]
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