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If this is what you want to do, use the GNU Library General +Public License instead of this License. diff --git a/Language/Brainfuck.hs b/Language/Brainfuck.hs new file mode 100644 --- /dev/null +++ b/Language/Brainfuck.hs @@ -0,0 +1,290 @@ +{- + +This is an interpreter of the brainf*ck language, written in +the pure, lazy, functional language Haskell. + +Copyright (C) 2006 by Jason Dagit + +This program is free software; you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation; either version 2 of the License, or +(at your option) any later version. + +This program is distributed in the hope that it will be useful, +but WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +GNU General Public License for more details. + +You should have received a copy of the GNU General Public License +along with this program; if not, write to the Free Software +Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA -} + +module Language.Brainfuck where + +import Data.Array.IO +import Data.Array hiding (array) +import Data.Array.Base (unsafeRead, unsafeWrite, array) +import Data.Word ( Word8 ) +import Data.Char ( ord, chr ) +import Data.List ( groupBy ) +import Data.Maybe ( catMaybes ) +import Control.Monad.State + +{- | The complete BF language: + +* \> Increment the pointer. +* \< Decrement the pointer. +* + Increment the byte at the pointer. +* \- Decrement the byte at the pointer. +* . Output the byte at the pointer. +* , Input a byte and store it in the byte at the pointer. +* [ Jump forward past the matching ] if the byte at the pointer is zero. +* ] Jump backward to the matching [ unless the byte at the pointer is zero. + +-} + +data Command = IncPtr + | IncPtrBy !Int -- ^ Increment pointer by set amount + | DecPtr + | IncByte + | IncByteBy !Int -- ^ Increment by a set amount + | DecByte + | OutputByte + -- | InputByte + | JmpForward !Int -- ^ nesting level + | JmpBackward !Int -- ^ nesting level + | SetIpTo !Int -- ^ Sets the instruction ptr to a specific value + | Halt + | Ignored + deriving (Show, Eq) + +type Core = IOUArray Int Word8 + +type InstPtr = Int +type CorePtr = Int +data BF = BF !Core !CorePtr !InstPtr + +instance Show BF where + show (BF _ cp ip) = "BF CorePtr = " ++ show cp ++ " InstPtr = " ++ show ip + +coreSize = 30000 + +core :: IO Core +core = newArray (0, coreSize - 1) (0::Word8) + +decode :: Char -> State Int Command +decode '>' = return IncPtr +decode '<' = return DecPtr +decode '+' = return IncByte +decode '-' = return DecByte +decode '.' = return OutputByte +-- decode ',' = return InputByte +decode '[' = do n <- get + put (n+1) + return $ JmpForward n +decode ']' = do n <- get + put (n-1) + return $ JmpBackward (n-1) +decode '@' = return Halt +decode _ = return Ignored + +debug :: Bool +debug = False + +incIP :: InstPtr -> InstPtr +incIP = (+ 1) +{-# INLINE incIP #-} + +incCP :: CorePtr -> CorePtr +incCP = (`mod` coreSize) . (1 +) +{-# inlinE incCP #-} + +decCP :: CorePtr -> CorePtr +decCP = (`mod` coreSize) . subtract 1 +{-# INLINE decCP #-} + +doCommand :: Array Int Command -> BF -> IO BF +doCommand cmds bf@(BF _ _ ip) = doCommand' (cmds ! ip) cmds bf + where + doCommand' :: Command -> Array Int Command -> BF -> IO BF + doCommand' Halt _ _ = undefined + doCommand' Ignored _ (BF c cp ip) = {-# SCC "Ignored" #-} do + when debug $ putStrLn $ "Ignored " ++ show bf + return (BF c cp (incIP ip)) + doCommand' IncPtr _ bf@(BF c cp ip) = {-# SCC "IncPtr" #-} do + when debug $ putStrLn $ "IncPtr " ++ show bf + return (BF c (incCP cp) (incIP ip)) + doCommand' DecPtr _ bf@(BF c cp ip) = {-# SCC "DecPtr" #-} do + when debug $ putStrLn $ "DecPtr " ++ show bf + return (BF c (decCP cp) (incIP ip)) + doCommand' (IncPtrBy n) _ bf@(BF c cp ip) = {-# SCC "IncPtrBy" #-} do + when debug $ putStrLn $ "IncPtrBy " ++ show n ++ " " ++ show bf + return (BF c ((cp + n) `mod` coreSize) (incIP ip)) + doCommand' IncByte _ bf = {-# SCC "IncByte" #-} do + when debug $ putStrLn $ "IncByte " ++ show bf + updateByte bf (+1) + doCommand' DecByte _ bf = {-# SCC "DecByte" #-} do + when debug $ putStrLn $ "DecByte " ++ show bf + updateByte bf (subtract 1) + doCommand' (IncByteBy n) _ bf = {-# SCC "IncByteBy" #-} do + when debug $ putStrLn $ "IncByteBy " ++ show n ++ " " ++ show bf + updateByte bf (+ fromIntegral n) + doCommand' OutputByte _ bf@(BF c cp ip) = {-# SCC "OutputByte" #-} do + when debug $ putStrLn $ "OutputByte " ++ show bf + c' <- unsafeRead c cp + putChar (word8ToChr c') + return (BF c cp (incIP ip)) + +{- + doCommand' InputByte _ bf@(BF c cp ip) = {-# SCC "InputByte" #-} do + when debug $ putStrLn $ "InputByte " ++ show bf + c' <- getChar + let newByte = chrToWord8 c' + unsafeWrite c cp newByte + return (BF c cp (incIP ip)) +-} + + doCommand' (JmpForward n) cmds bf@(BF c cp ip) = {-# SCC "JmpForw" #-} do + c' <- unsafeRead c cp + case c' of + 0 -> {-# SCC "JmpForward1" #-} do + when debug $ putStrLn $ "JmpForward1 " ++ show bf + return (BF c cp newInstPtr) + _ -> {-# SCC "JmpForward2" #-} do + when debug $ putStrLn $ "JmpForward2 " ++ show bf + let newBF = (BF c cp (incIP ip)) + when debug $ putStrLn $ "JmpForward3" ++ show newBF + return newBF + where + -- we add one to go one past the next back jump + newInstPtr = (nextJmp cmds ip (+1) (JmpBackward n)) + 1 + doCommand' (JmpBackward n) cmds bf@(BF c cp ip) = {-# SCC "JmpBack" #-} do + c' <- unsafeRead c cp + if (c' /= 0) + then do when debug $ putStrLn $ "JmpBackward1 " ++ show bf + return (BF c cp newInstPtr) + else do when debug $ putStrLn $ "JmpBackward2 " ++ show bf + return (BF c cp (incIP ip)) + where + newInstPtr = nextJmp cmds ip (subtract 1) (JmpForward n) + doCommand' (SetIpTo i) _ bf@(BF c cp ip) = {-# SCC "SetIPTo" #-} do + c' <- unsafeRead c cp + when debug $ putStrLn $ "SetIpTo " ++ show i ++ " " + ++ show bf ++ " @" ++ show c' + -- jmping behaves differently depending on jmp forward vs. backward + -- we handle that with pos. vs. neg addresses + -- Note: SetIpTo 0 is always a JmpBackward + -- Because the first instruction cannot be SetIpTo 0 + if i > 0 + then if (c' == 0) + then return $ BF c cp i + else return $ BF c cp (incIP ip) + else if (c' /= 0) + then return $ BF c cp (-i) + else return $ BF c cp (incIP ip) + +nextJmp :: Array Int Command + -> InstPtr + -> (InstPtr -> InstPtr) -> Command -> InstPtr +nextJmp cmds ip f cmd = if cmds ! ip == cmd + then ip + else nextJmp cmds (f ip) f cmd + +chrToWord8 :: Char -> Word8 +chrToWord8 = fromIntegral . ord + +word8ToChr :: Word8 -> Char +word8ToChr = chr . fromIntegral + +updateByte (BF c cp ip) f = do + e <- unsafeRead c cp + unsafeWrite c cp (f e) + return (BF c cp (incIP ip)) +{-# INLINE updateByte #-} + +loadProgram :: String -> Array Int Command +loadProgram [] = array (0, 0) [(0, Halt)] + +-- adding a halt on to the end fixes a bug when called from an irc session +loadProgram prog = optimize (cs++[Halt]) + where + cs = fst $ runState (mapM decode prog) 0 + n = length cs -- strictness + +optimize :: [Command] -> Array Int Command +optimize cmds = listArray (0, (length reduced)-1) reduced + where + reduced = phase3 . phase2 . phase1 $ cmds + -- phase1 removes ignored things + phase1 :: [Command] -> [Command] + phase1 = filter (/=Ignored) + -- in phase2 group inc/dec into special instructions + phase2 :: [Command] -> [Command] + phase2 cs = concat $ map reduce $ groupBy (==) cs + where + reduce :: [Command] -> [Command] + reduce cs + | all (==IncPtr) cs = [IncPtrBy (length cs)] + | all (==DecPtr) cs = [IncPtrBy (-(length cs))] + | all (==IncByte) cs = [IncByteBy (length cs)] + | all (==DecByte) cs = [IncByteBy (-(length cs))] + | otherwise = cs + -- now we can turn jumps into changes of the ip + phase3 :: [Command] -> [Command] + phase3 cmds = updates (updates cmds jmpBs) jmpFs + where + jmpBs = calcJmpBs (zip [0..] cmds) + jmpFs = calcJmpFs (zip [0..] cmds) + update :: [a] -> (Int, a) -> [a] + update xs (i, a) = take i xs ++ [a] ++ drop (i+1) xs + updates :: [a] -> [(Int, a)] -> [a] + updates xs [] = xs + updates xs (u:us) = updates (update xs u) us + nested :: Command -> Int + nested (JmpForward n) = n + nested (JmpBackward n) = n + nested _ = undefined + isJmpB (JmpBackward _) = True + isJmpB _ = False + isJmpF (JmpForward _) = True + isJmpF _ = False + calcJmpBs :: [(Int, Command)] -> [(Int, Command)] + calcJmpBs cmds = catMaybes $ map newCmd (filter (isJmpB . snd) cmds) + where + newCmd (i, c) = absJmpB (i, findPrevJmpF (map snd cmds) i (nested c)) + calcJmpFs :: [(Int, Command)] -> [(Int, Command)] + calcJmpFs cmds = catMaybes $ map newCmd (filter (isJmpF . snd) cmds) + where + newCmd (i, c) = absJmpF (i, findNextJmpB (map snd cmds) i (nested c)) + absJmpB :: (Int, Maybe Int) -> Maybe (Int, Command) + absJmpB (_, Nothing) = Nothing + absJmpB (i, Just n) = Just $ (i, SetIpTo (-n)) + absJmpF (_, Nothing) = Nothing + absJmpF (i, Just n) = Just $ (i, SetIpTo (n+1)) + findPrevJmpF :: [Command] + -> Int -- ^ index to start at + -> Int -- ^ nesting level to match + -> Maybe Int -- ^ index of next JmpF + findPrevJmpF _ i _ | i < 0 = Nothing + findPrevJmpF cmds i n = case (cmds !! i) of + (JmpForward l) | l == n -> Just i + _ -> findPrevJmpF cmds (i-1) n + + findNextJmpB :: [Command] + -> Int -- ^ index to start at + -> Int -- ^ nesting level to match + -> Maybe Int -- ^ index of next JmpF + findNextJmpB cmds i _ | i >= length cmds = Nothing + findNextJmpB cmds i n = case (cmds !! i) of + (JmpBackward l) | l == n -> Just i + _ -> findNextJmpB cmds (i+1) n + +execute :: Array Int Command -> Int -> BF -> IO () +execute cmds n bf@(BF _ _ ip) = do + if ip >= n || cmds ! ip == Halt + then halt + else doCommand cmds bf >>= execute cmds n + +halt = if debug + then putStrLn "Machine Halted.\n" + else putStrLn "\n" diff --git a/Language/Brainfuck/Examples.hs b/Language/Brainfuck/Examples.hs new file mode 100644 --- /dev/null +++ b/Language/Brainfuck/Examples.hs @@ -0,0 +1,104 @@ +module Language.Brainfuck.Examples where + +-- Example Programs +helloWorld, bottles, helloum, sort, toupper :: String +helloWorld = + ">+++++++++[<++++++++>-]<.>+++++++[<++++>-]<+.+++++++..+++.[-]>++++++++[<++++>-]"++ + "<.#>+++++++++++[<+++++>-]<.>++++++++[<+++>-]<.+++.------.--------.[-]>++++++++["++ + "<++++>-]<+.[-]++++++++++." +-- works now, thanks to int-e for explaining the BF spec to me +bottles = + "99 Bottles of Beer in Urban Mueller's BrainF*** (The actual"++ + "name is impolite)"++ + ""++ + "by Ben Olmstead"++ + ""++ + "ANSI C interpreter available on the internet; due to"++ + "constraints in comments the address below needs to have the"++ + "stuff in parenthesis replaced with the appropriate symbol:"++ + ""++ + "http://www(dot)cats(dash)eye(dot)com/cet/soft/lang/bf/"++ + ""++ + "Believe it or not this language is indeed Turing complete!"++ + "Combines the speed of BASIC with the ease of INTERCAL and"++ + "the readability of an IOCCC entry!"++ + ""++ + ">+++++++++[<+++++++++++>-]<[>[-]>[-]<<[>+>+<<-]>>[<<+>>-]>>>"++ + "[-]<<<+++++++++<[>>>+<<[>+>[-]<<-]>[<+>-]>[<<++++++++++>>>+<"++ + "-]<<-<-]+++++++++>[<->-]>>+>[<[-]<<+>>>-]>[-]+<<[>+>-<<-]<<<"++ + "[>>+>+<<<-]>>>[<<<+>>>-]>[<+>-]<<-[>[-]<[-]]>>+<[>[-]<-]<+++"++ + "+++++[<++++++<++++++>>-]>>>[>+>+<<-]>>[<<+>>-]<[<<<<<.>>>>>-"++ + "]<<<<<<.>>[-]>[-]++++[<++++++++>-]<.>++++[<++++++++>-]<++.>+"++ + "++++[<+++++++++>-]<.><+++++..--------.-------.>>[>>+>+<<<-]>"++ + ">>[<<<+>>>-]<[<<<<++++++++++++++.>>>>-]<<<<[-]>++++[<+++++++"++ + "+>-]<.>+++++++++[<+++++++++>-]<--.---------.>+++++++[<------"++ + "---->-]<.>++++++[<+++++++++++>-]<.+++..+++++++++++++.>++++++"++ + "++[<---------->-]<--.>+++++++++[<+++++++++>-]<--.-.>++++++++"++ + "[<---------->-]<++.>++++++++[<++++++++++>-]<++++.-----------"++ + "-.---.>+++++++[<---------->-]<+.>++++++++[<+++++++++++>-]<-."++ + ">++[<----------->-]<.+++++++++++..>+++++++++[<---------->-]<"++ + "-----.---.>>>[>+>+<<-]>>[<<+>>-]<[<<<<<.>>>>>-]<<<<<<.>>>+++"++ + "+[<++++++>-]<--.>++++[<++++++++>-]<++.>+++++[<+++++++++>-]<."++ + "><+++++..--------.-------.>>[>>+>+<<<-]>>>[<<<+>>>-]<[<<<<++"++ + "++++++++++++.>>>>-]<<<<[-]>++++[<++++++++>-]<.>+++++++++[<++"++ + "+++++++>-]<--.---------.>+++++++[<---------->-]<.>++++++[<++"++ + "+++++++++>-]<.+++..+++++++++++++.>++++++++++[<---------->-]<"++ + "-.---.>+++++++[<++++++++++>-]<++++.+++++++++++++.++++++++++."++ + "------.>+++++++[<---------->-]<+.>++++++++[<++++++++++>-]<-."++ + "-.---------.>+++++++[<---------->-]<+.>+++++++[<++++++++++>-"++ + "]<--.+++++++++++.++++++++.---------.>++++++++[<---------->-]"++ + "<++.>+++++[<+++++++++++++>-]<.+++++++++++++.----------.>++++"++ + "+++[<---------->-]<++.>++++++++[<++++++++++>-]<.>+++[<----->"++ + "-]<.>+++[<++++++>-]<..>+++++++++[<--------->-]<--.>+++++++[<"++ + "++++++++++>-]<+++.+++++++++++.>++++++++[<----------->-]<++++"++ + ".>+++++[<+++++++++++++>-]<.>+++[<++++++>-]<-.---.++++++.----"++ + "---.----------.>++++++++[<----------->-]<+.---.[-]<<<->[-]>["++ + "-]<<[>+>+<<-]>>[<<+>>-]>>>[-]<<<+++++++++<[>>>+<<[>+>[-]<<-]"++ + ">[<+>-]>[<<++++++++++>>>+<-]<<-<-]+++++++++>[<->-]>>+>[<[-]<"++ + "<+>>>-]>[-]+<<[>+>-<<-]<<<[>>+>+<<<-]>>>[<<<+>>>-]<>>[<+>-]<"++ + "<-[>[-]<[-]]>>+<[>[-]<-]<++++++++[<++++++<++++++>>-]>>>[>+>+"++ + "<<-]>>[<<+>>-]<[<<<<<.>>>>>-]<<<<<<.>>[-]>[-]++++[<++++++++>"++ + "-]<.>++++[<++++++++>-]<++.>+++++[<+++++++++>-]<.><+++++..---"++ + "-----.-------.>>[>>+>+<<<-]>>>[<<<+>>>-]<[<<<<++++++++++++++"++ + ".>>>>-]<<<<[-]>++++[<++++++++>-]<.>+++++++++[<+++++++++>-]<-"++ + "-.---------.>+++++++[<---------->-]<.>++++++[<+++++++++++>-]"++ + "<.+++..+++++++++++++.>++++++++[<---------->-]<--.>+++++++++["++ + "<+++++++++>-]<--.-.>++++++++[<---------->-]<++.>++++++++[<++"++ + "++++++++>-]<++++.------------.---.>+++++++[<---------->-]<+."++ + ">++++++++[<+++++++++++>-]<-.>++[<----------->-]<.+++++++++++"++ + "..>+++++++++[<---------->-]<-----.---.+++.---.[-]<<<]"++ + "@" +helloum = + "++++++++++[>+++++++>++++++++++>+++>+<<<<-]>++.>+.+++++++..+++.>++.<<+++++++++++++++.>.+++.------.--------.>+.>.@" +-- can't figure this one out either... +sort = + "Here is a Brainf*** program that bubblesorts its input and spits it out:"++ + ">>>>>,+[>>>,+]<<<[<<<"++ + "[>>>[-<<<-<+>[>]>>]<<<[<]>>"++ + "[>>>+<<<-]<[>+>>>+<<<<-]"++ + "<<]>>>[-.[-]]>>>[>>>]<<<]" +toupper = + ",----------[----------------------.,----------]" + +{- +Example optimized programs: + +++++[>++++++++<-]>[.+] + +[(0,IncByteBy 4), (1,SetIpTo 7), (2,IncPtrBy 1), + (3,IncByteBy 8), (4,IncPtrBy (-1)), (5,IncByteBy (-1)), + (6,SetIpTo (-1)), (7,IncPtrBy 1), (8,SetIpTo 12), + (9,OutputByte), (10,IncByteBy 1), (11,SetIpTo (-8)), + (12,Halt) +] + +[[]] + +[(0,SetIpTo 4), + (1,SetIpTo 3), + (2,SetIpTo (-1)), + (3,SetIpTo 0), + (4,Halt) +] + +-} diff --git a/Main.hs b/Main.hs new file mode 100644 --- /dev/null +++ b/Main.hs @@ -0,0 +1,20 @@ +module Main where + +import Language.Brainfuck +import Language.Brainfuck.Examples +import Control.Monad (when) + +import Data.Array hiding (array) +import System.Posix.Resource + +main :: IO () +main = do + setResourceLimit ResourceCPUTime $ ResourceLimits (ResourceLimit 5) (ResourceLimit 5) + run + +run = do + prog <- getContents + c <- core + let cmds = loadProgram prog + when debug $ print cmds + execute cmds (snd (bounds cmds)) (BF c 0 0) diff --git a/Setup.hs b/Setup.hs new file mode 100644 --- /dev/null +++ b/Setup.hs @@ -0,0 +1,5 @@ +#!/usr/bin/runhaskell + +import Distribution.Simple + +main = defaultMainWithHooks simpleUserHooks diff --git a/brainfuck.cabal b/brainfuck.cabal new file mode 100644 --- /dev/null +++ b/brainfuck.cabal @@ -0,0 +1,29 @@ +name: brainfuck +version: 0.1 + +license: GPL +license-file: LICENSE +author: Jason Dagit +-- maintainer: Cale + +stability: Stable +category: Compilers/Interpreters +synopsis: Brainfuck interpreter +description: This is an interpreter of the brainf*ck language, + written in the pure, lazy, functional language Haskell. + +build-type: Simple +Cabal-Version: >= 1.2 +tested-with: GHC==6.8.2 + +executable bf + main-is: Main.hs + build-depends: base>3, unix, array, mtl + +library + exposed-modules: Language.Brainfuck, Language.Brainfuck.Examples + + build-depends: base, array, mtl + + ghc-options: -Wall + ghc-prof-options: -prof -auto-all