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module Main where
import System.Environment
import System.Exit
import System.IO.Error
import Control.Exception
import Control.Monad
import Data.Char
import Data.Either
import Data.Maybe
import Data.List as List
import Data.Map.Strict as Map
type Stackelem = Integer
c_ripmode :: Bool
c_ripmode = True
c_debugmode :: Bool
c_debugmode = False
booltoint :: (Integral a) => Bool -> a
booltoint False = 0
booltoint True = 1
riperror :: String -> IO a
riperror s = do
if c_ripmode
then putStrLn "rip"
else putStrLn $ "ERROR: " ++ s
exitFailure
fromRight :: Either a b -> b
fromRight (Right r) = r
fromLeft :: Either a b -> a
fromLeft (Left l) = l
safeGetChar :: IO (Maybe Char)
safeGetChar =
catch
(liftM Just getChar)
((\ex -> if isEOFError ex then return Nothing else ioError ex)
:: IOError -> IO (Maybe Char))
parenpairs :: Char -> Char -> String -> Either String [(Int,Int)]
parenpairs open close s = go 0 [] s -- index, stack, string
where
go _ [] [] = Right []
go i st s
| length s /= 0 && head s == open =
go (i+1) (i:st) (tail s)
| length st == 0 && length s /= 0 && head s == close =
Left $ "Unmatched closing '" ++ [close,'\'']
| length st /= 0 && length s == 0 =
Left $ "Unmatched open '" ++ [open,'\'']
| length st /= 0 && length s /= 0 && head s == close =
either Left (\x -> Right $ (head st,i):x) $ go (i+1) (tail st) (tail s)
| otherwise =
go (i+1) st (tail s)
bracketpairs :: String -> Either String [(Int,Int)]
bracketpairs = parenpairs '[' ']'
-- returns string in and after codeblock
getcodeblock :: String -> Either String (String,String)
getcodeblock s =
if length afterwhite /= 0 && head afterwhite == '['
then getcodeblock' afterwhite
else Left "No codeblock when expected"
where afterwhite = dropWhile isSpace s
-- assumes that s starts immediately with '['
getcodeblock' :: String -> Either String (String,String)
getcodeblock' s = either Left (\_ -> Right (inblock,afterblock)) parenserr
where
parenserr = bracketpairs s
parens = fromRight parenserr
mainpair = minimum parens
blockend = snd mainpair
inblock = drop 1 $ take blockend s
afterblock = drop (blockend + 1) s
-- code substr error / name
getfuncname :: String -> Either String String
getfuncname s =
if length afterwhite /= 0 && head afterwhite == '<'
then getfuncname' afterwhite
else Left "No function name when expected"
where
afterwhite = dropWhile isSpace s
-- assumes that the argument starts immediately with '<'
getfuncname' :: String -> Either String String
getfuncname' (_:xs) =
if isNothing maybeidx
then Left "No closing '>' in function name"
else Right name
where
maybeidx = List.findIndex (== '>') xs
name = take (fromJust maybeidx) xs
-- returns the resulting stack
-- rip: Rip InterPreter (recursive acronym)
rip :: String -> IO [Stackelem]
rip s = rip' s Map.empty []
-- code function map stack resulting stack
rip' :: String -> Map.Map String String -> [Stackelem] -> IO [Stackelem]
rip' [] _ st = return st
rip' code@(x:xs) fns st = do
if c_debugmode then print st else return ()
case x of
n | '0' <= n && n <= '9' ->
rip' xs fns (fromIntegral (ord n - ord '0') : st)
'P' ->
rip' xs fns (tail st)
'S' ->
rip' xs fns (b:a:cs)
where (a:b:cs) = st
'D' ->
rip' xs fns (head st : st)
'i' ->
rip' xs fns (head st + 1 : tail st)
'd' ->
rip' xs fns (head st - 1 : tail st)
'r' ->
rip' xs fns res
where
n = fromIntegral $ head st
newst = tail st
(begin, rest) = (take n newst, drop n newst)
res = tail begin ++ head begin : rest
'R' ->
rip' xs fns res
where
n = fromIntegral $ head st
newst = tail st
(begin, rest) = (take n newst, drop n newst)
res = last begin : init begin ++ rest --SLOW!
'l' ->
rip' xs fns (fromIntegral (length st) : st)
'a' ->
rip' xs fns (a + b : cs)
where (b:a:cs) = st
's' ->
rip' xs fns (a - b : cs)
where (b:a:cs) = st
'm' ->
rip' xs fns (a * b : cs)
where (b:a:cs) = st
'q' ->
rip' xs fns (a `div` b : cs)
where (b:a:cs) = st
'G' ->
rip' xs fns (booltoint (a > b) : cs)
where (b:a:cs) = st
'L' ->
rip' xs fns (booltoint (a < b) : cs)
where (b:a:cs) = st
'E' ->
rip' xs fns (booltoint (a == b) : cs)
where (b:a:cs) = st
'n' ->
rip' xs fns (booltoint (head st == 0) : tail st)
'I' ->
let maybecb = getcodeblock xs
in case maybecb of
Left s -> riperror s
Right (inblock,afterblock) ->
if head st /= 0
then do
newstack <- rip' inblock fns (tail st)
rip' afterblock fns newstack
else rip' afterblock fns (tail st)
'W' ->
let maybecb = getcodeblock xs
in case maybecb of
Left s -> riperror s
Right (inblock,afterblock) ->
let
doloop st = do
newstack <- rip' inblock fns st
if head newstack /= 0
then doloop $ tail newstack
else return $ tail newstack
in if head st /= 0
then do
newstack <- doloop (tail st)
rip' afterblock fns newstack
else rip' afterblock fns (tail st)
'o' -> do
let n = fromIntegral (head st)
res <- try $ evaluate $ chr n :: IO (Either SomeException Char)
either
(\ex -> riperror $ "Invalid character value " ++ (show n))
(\c -> do
putChar c
rip' xs fns (tail st))
res
'O' -> do
putStr $ show (head st)
rip' xs fns (tail st)
'g' -> do
n <- liftM (maybe (-1) ord) safeGetChar
rip' xs fns (fromIntegral n : st)
'<' ->
case (getfuncname code) of
Left s -> riperror s
Right name -> case (Map.lookup name fns) of
Nothing -> riperror $ "Function '" ++ name ++ "' not found"
Just s -> let newcode = drop (length name + 1) xs
in do
newstack <- rip' s fns st
rip' newcode fns newstack
'F' -> case (getfuncname xs) of
Left s -> riperror s
Right name -> case (Map.lookup name fns) of
Just _ -> riperror $ "Function '" ++ name ++ "' already exists"
Nothing -> case (getcodeblock $ drop (length name + 2) xs) of
Left s -> riperror s
Right (inblock,afterblock) ->
rip' afterblock (Map.insert name inblock fns) st
'$' -> do
print st
rip' xs fns st
c | isSpace c ->
rip' xs fns st
_ -> riperror $ "Unknown command '" ++ [x,'\'']
main :: IO ()
main = do
argv <- getArgs
if length argv /= 1
then do
putStrLn "Pass a rip file as the command-line argument"
exitFailure
else do
source <- readFile (argv !! 0)
rip source
return ()
|
