Day 18, part 2 - now with record syntax!
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18b.hs
97
18b.hs
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@ -7,31 +7,32 @@ import qualified Data.Vector.Unboxed as V (replicate)
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-- DEFINITIONS
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type Registers = Vector Int
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type Program = (Registers, Int, Seq Int)
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type Instruction = ProgramId -> State -> State
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data State = State Program Program (Bool, Bool) Int
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data Value = Register Char | Number Int
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data ProgramId = Zero | One
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data Program = Program {
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registers :: Registers,
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position :: Int,
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queue :: Seq Int
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}
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data State = State {
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zero :: Program,
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one :: Program,
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stop :: (Bool, Bool),
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count :: Int
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}
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-- HELPERS
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getPos :: ProgramId -> State -> Int
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getPos Zero (State (_, pos, _) _ _ _) = pos
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getPos One (State _ (_, pos, _) _ _) = pos
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getStop :: ProgramId -> State -> Bool
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getStop Zero (State _ _ (stop, _) _) = stop
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getStop One (State _ _ (_, stop) _) = stop
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setStop :: ProgramId -> Bool -> State -> State
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setStop Zero b (State p0 p1 (_, stop1) count) = State p0 p1 (b, stop1) count
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setStop One b (State p0 p1 (stop0, _) count) = State p0 p1 (stop0, b) count
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setStop Zero b state = state { stop = (b, snd $ stop state) }
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setStop One b state = swap . setStop Zero b . swap $ state
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pop :: Seq Int -> (Seq Int, Int)
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pop queue = (deleteAt 0 queue, queue `index` 0)
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getProgram :: ProgramId -> State -> Program
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getProgram Zero state = zero state
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getProgram One state = one state
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swap :: State -> State
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swap (State p0 p1 (stop0, stop1) count) = State p1 p0 (stop1, stop0) count
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swap (State p0 p1 (s0, s1) c) = State p1 p0 (s1, s0) c
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getIndex :: Value -> Int
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getIndex (Register c) = case c of
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@ -42,36 +43,50 @@ getIndex (Register c) = case c of
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'p' -> 4
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getValue :: Value -> Registers -> Int
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getValue value registers = case value of
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getValue v r = case v of
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Number i -> i
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c -> registers ! (getIndex c)
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c -> r ! (getIndex c)
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-- OPERATIONS
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sen :: Value -> ProgramId -> State -> State
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sen v Zero (State (reg0, pos0, que0) (reg1, pos1, que1) stop count) =
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setStop One False $ State (reg0, pos0 + 1, que0) (reg1, pos1, que1 |> getValue v reg0) stop count
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sen v One (State (reg0, pos0, que0) (reg1, pos1, que1) stop count) =
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setStop Zero False $ State (reg0, pos0, que0 |> getValue v reg1) (reg1, pos1 + 1, que1) stop (count + 1)
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sen :: Value -> Instruction
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sen v Zero (State p0 p1 s c) =
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State p0 {
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position = position p0 + 1
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} p1 {
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queue = queue p1 |> getValue v (registers p0)
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} (fst s, False) c
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sen v One state = swap . sen v Zero . swap $ state { count = count state + 1 }
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rcv :: Value -> ProgramId -> State -> State
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rcv i Zero (State (reg0, pos0, que0) p1 stop count) =
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if S.null que0 then setStop Zero True $ State (reg0, pos0, que0) p1 stop count else
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let ind = getIndex i
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(que, val) = pop que0
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in State (reg0 // [(ind, val)], pos0 + 1, que) p1 stop count
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rcv :: Value -> Instruction
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rcv i Zero (State p0 p1 s c) =
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if S.null $ queue p0 then State p0 p1 (True, snd s) c else
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let (que, val) = pop $ queue p0
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in State p0 {
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registers = registers p0 // [(getIndex i, val)],
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position = position p0 + 1,
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queue = que
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} p1 s c
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where pop q = (deleteAt 0 q, q `index` 0)
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rcv i One state = swap . rcv i Zero . swap $ state
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app :: (Int -> Int -> Int) -> Value -> Value -> ProgramId -> State -> State
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app f i v Zero (State (reg0, pos0, que0) p1 stop count) =
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let ind = getIndex i
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val = getValue v reg0
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in State (reg0 // [(ind, reg0 ! ind `f` val)], pos0 + 1, que0) p1 stop count
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app :: (Int -> Int -> Int) -> Value -> Value -> Instruction
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app f i v Zero (State p0 p1 s c) =
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let reg = registers p0
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ind = getIndex i
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val = getValue v reg
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in State p0 {
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registers = reg // [(ind, reg ! ind `f` val)],
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position = position p0 + 1
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} p1 s c
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app f i v One state = swap . app f i v Zero . swap $ state
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jgz :: Value -> Value -> ProgramId -> State -> State
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jgz condition offset Zero (State (reg0, pos0, que0) p1 stop count) =
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State (reg0, pos0 + if getValue condition reg0 > 0 then getValue offset reg0 else 1, que0) p1 stop count
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jgz :: Value -> Value -> Instruction
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jgz condition offset Zero (State p0 p1 s c) =
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let reg = registers p0
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in State p0 {
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position = position p0 + if getValue condition reg > 0 then getValue offset reg else 1
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} p1 s c
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jgz condition offset One state = swap . jgz condition offset Zero . swap $ state
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-- PARSE
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@ -95,19 +110,19 @@ parseLine str =
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executeNextInstruction :: Seq Instruction -> ProgramId -> State -> State
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executeNextInstruction instructions pid state =
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let pos = getPos pid state
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let pos = position . getProgram pid $ state
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in if pos >= length instructions then setStop pid True state
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else (instructions `index` pos) pid state
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getCount :: Seq Instruction -> State -> Int
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getCount _ (State _ _ (True, True) count) = count
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getCount _ (State _ _ (True, True) c) = c
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getCount instructions state =
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if not $ getStop Zero state
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if not . fst . stop $ state
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then getCount instructions $ executeNextInstruction instructions Zero state
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else getCount instructions $ executeNextInstruction instructions One state
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main :: IO ()
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main = do
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instructions <- fmap (fromList . map parseLine . lines) $ readFile "18.txt"
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let initialState = (State (V.replicate 5 0, 0, empty) (V.replicate 5 0 // [(4, 1)], 0, empty) (False, False) 0) :: State
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let initialState = (State (Program (V.replicate 5 0) 0 empty) (Program (V.replicate 5 0 // [(4, 1)]) 0 empty) (False, False) 0)
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print $ getCount instructions initialState
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