brainfuck (empty) → 0.1
raw patch · 6 files changed
+788/−0 lines, 6 filesdep +arraydep +basedep +mtlsetup-changed
Dependencies added: array, base, mtl, unix
Files
- LICENSE +340/−0
- Language/Brainfuck.hs +290/−0
- Language/Brainfuck/Examples.hs +104/−0
- Main.hs +20/−0
- Setup.hs +5/−0
- brainfuck.cabal +29/−0
+ LICENSE view
@@ -0,0 +1,340 @@+ GNU GENERAL PUBLIC LICENSE+ Version 2, June 1991++ Copyright (C) 1989, 1991 Free Software Foundation, Inc.+ 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA+ Everyone is permitted to copy and distribute verbatim copies+ of this license document, but changing it is not allowed.++ Preamble++ The licenses for most software are designed to take away your+freedom to share and change it. By contrast, the GNU General Public+License is intended to guarantee your freedom to share and change free+software--to make sure the software is free for all its users. This+General Public License applies to most of the Free Software+Foundation's software and to any other program whose authors commit to+using it. (Some other Free Software Foundation software is covered by+the GNU Library General Public License instead.) You can apply it to+your programs, too.++ When we speak of free software, we are referring to freedom, not+price. 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+ Language/Brainfuck.hs view
@@ -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 <dagit@codersbase.com>++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 <core> 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"
+ Language/Brainfuck/Examples.hs view
@@ -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)+]++-}
+ Main.hs view
@@ -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)
+ Setup.hs view
@@ -0,0 +1,5 @@+#!/usr/bin/runhaskell++import Distribution.Simple++main = defaultMainWithHooks simpleUserHooks
+ brainfuck.cabal view
@@ -0,0 +1,29 @@+name: brainfuck+version: 0.1++license: GPL+license-file: LICENSE+author: Jason Dagit <dagit@codersbase.com>+-- 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