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drbrainfuck.hs
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Tape is now an immutable Vector

This commit is contained in:
Claudio Maggioni (maggicl) 2020-11-08 16:25:29 +01:00
parent 795d3e2c8b
commit 02c382ca13
1 changed files with 11 additions and 10 deletions
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21
src/Interpreter.hs
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@ -1,5 +1,4 @@
module Interpreter where
-- vim: set ts=4 sw=4 et tw=80:
import Data.Maybe (catMaybes)
import Debug.Trace
import Control.Monad.Trans.State
@ -29,7 +28,7 @@ updateCell Sub (Byte 0) = Byte 255
updateCell Add (Byte i) = Byte (i + 1)
updateCell Sub (Byte i) = Byte (i - 1)
type Tape = [Byte]
type Tape = V.Vector Byte
type Program = V.Vector Instruction
data Memory = Memory { tape :: Tape, dp :: Int } deriving (Show)
@ -43,8 +42,7 @@ toProgram s = case progL of [] -> Nothing
where progL = catMaybes $ fmap parseInstr s
tapeHelp :: Tape -> Int -> (Byte -> Byte) -> Tape
tapeHelp (t:tt) 0 alter = alter t : tt
tapeHelp (t:tt) dp alter = t : (tapeHelp tt (dp-1) alter)
tapeHelp t dp upd = t V.// [(dp, upd $ t V.! dp)]
data Error = NegTape | LoopNoMatch deriving (Show)
@ -63,9 +61,10 @@ execTapeLeft = state $ \p -> case dp p of 0 -> (Just NegTape, p)
execTapeRight :: State Memory (Maybe Error)
execTapeRight = state $ \p -> (Nothing, newMem p)
where newMem p = p { tape = tape p ++ newTape p, dp = dp p + 1 }
newTape p = case dp p == length (tape p) - 1 of True -> [Byte 0]
_ -> []
where newMem p = p { tape = newTape p, dp = dp p + 1 }
newTape p
| dp p == V.length (tape p) - 1 = V.snoc (tape p) $ Byte 0
| otherwise = tape p
execIn :: StateT Memory IO (Maybe Error)
execIn = StateT $ \p -> do chr <- getChar
@ -74,7 +73,8 @@ execIn = StateT $ \p -> do chr <- getChar
where newTape tp p = p { tape = tapeHelp (tape p) (dp p) (\_ -> Byte tp) }
execOut :: StateT Memory IO (Maybe Error)
execOut = StateT $ \p -> putChar (chr (tape p !! dp p)) >> (return (Nothing, p))
execOut = StateT $ \p -> putChar (chr $ tape p V.! dp p) >>
(return (Nothing, p))
findMatching :: Program -> Instruction -> Int -> Maybe Int
findMatching prg par = fmHelper $ -1
@ -95,7 +95,7 @@ execLoop :: Program -> Instruction -> Int -> State Memory Term
execLoop p i ip = state $ \w -> case posOrF w of
Just n -> (Next $ n + 1, w)
Nothing -> (Crash LoopNoMatch ip, w)
where posOrF ps = case ((tape ps !! dp ps) == Byte 0, i) of
where posOrF ps = case ((tape ps V.! dp ps) == Byte 0, i) of
(True, LoopStart) -> findMatching p i ip
(False, LoopEnd) -> findMatching p i ip
_ -> Just ip
@ -135,8 +135,9 @@ execute p = runStateT $ runInstruction 0
initMemory :: Memory
initMemory = Memory { tape = [Byte 0], dp = 0 }
initMemory = Memory { tape = V.singleton $ Byte 0, dp = 0 }
run :: String -> IO ((Term, Memory))
run str = case toProgram str of Nothing -> return (Done, initMemory)
Just pp -> execute pp initMemory
-- vim: set ts=4 sw=4 et tw=80: