Call OnUsedAmmo *after* doing the normal CurAmmoType stuff so CurAmmoType actually points to the right bloody weapon
module Store(
ElemIndex(),
MStore(),
IStore(),
newStore,
addElem,
removeElem,
readElem,
writeElem,
modifyElem,
elemExists,
firstIndex,
indicesM,
withIStore,
withIStore2,
(!),
indices
) where
import qualified Data.Array.IArray as IA
import qualified Data.Array.IO as IOA
import qualified Data.IntSet as IntSet
import Data.IORef
import Control.Monad
newtype ElemIndex = ElemIndex Int
deriving (Eq, Show, Read, Ord)
newtype MStore e = MStore (IORef (IntSet.IntSet, IntSet.IntSet, IOA.IOArray Int e))
newtype IStore e = IStore (IntSet.IntSet, IA.Array Int e)
firstIndex :: ElemIndex
firstIndex = ElemIndex 0
-- MStore code
initialSize :: Int
initialSize = 10
growFunc :: Int -> Int
growFunc a = a * 3 `div` 2
newStore :: IO (MStore e)
newStore = do
newar <- IOA.newArray_ (0, initialSize - 1)
new <- newIORef (IntSet.empty, IntSet.fromAscList [0..initialSize - 1], newar)
return (MStore new)
growStore :: MStore e -> IO ()
growStore (MStore ref) = do
(busyElems, freeElems, arr) <- readIORef ref
(_, m') <- IOA.getBounds arr
let newM' = growFunc (m' + 1) - 1
newArr <- IOA.newArray_ (0, newM')
sequence_ [IOA.readArray arr i >>= IOA.writeArray newArr i | i <- [0..m']]
writeIORef ref (busyElems, freeElems `IntSet.union` (IntSet.fromAscList [m'+1..newM']), newArr)
growIfNeeded :: MStore e -> IO ()
growIfNeeded m@(MStore ref) = do
(_, freeElems, _) <- readIORef ref
when (IntSet.null freeElems) $ growStore m
addElem :: MStore e -> e -> IO ElemIndex
addElem m@(MStore ref) element = do
growIfNeeded m
(busyElems, freeElems, arr) <- readIORef ref
let (n, freeElems') = IntSet.deleteFindMin freeElems
IOA.writeArray arr n element
writeIORef ref (IntSet.insert n busyElems, freeElems', arr)
return $ ElemIndex n
removeElem :: MStore e -> ElemIndex -> IO ()
removeElem (MStore ref) (ElemIndex n) = do
(busyElems, freeElems, arr) <- readIORef ref
IOA.writeArray arr n (error $ "Store: no element " ++ show n)
writeIORef ref (IntSet.delete n busyElems, IntSet.insert n freeElems, arr)
readElem :: MStore e -> ElemIndex -> IO e
readElem (MStore ref) (ElemIndex n) = readIORef ref >>= \(_, _, arr) -> IOA.readArray arr n
writeElem :: MStore e -> ElemIndex -> e -> IO ()
writeElem (MStore ref) (ElemIndex n) el = readIORef ref >>= \(_, _, arr) -> IOA.writeArray arr n el
modifyElem :: MStore e -> (e -> e) -> ElemIndex -> IO ()
modifyElem (MStore ref) f (ElemIndex n) = do
(_, _, arr) <- readIORef ref
IOA.readArray arr n >>= IOA.writeArray arr n . f
elemExists :: MStore e -> ElemIndex -> IO Bool
elemExists (MStore ref) (ElemIndex n) = do
(_, free, _) <- readIORef ref
return $ n `IntSet.notMember` free
indicesM :: MStore e -> IO [ElemIndex]
indicesM (MStore ref) = do
(busy, _, _) <- readIORef ref
return $ map ElemIndex $ IntSet.toList busy
-- A way to see MStore elements in pure code via IStore
m2i :: MStore e -> IO (IStore e)
m2i (MStore ref) = do
(a, _, c') <- readIORef ref
c <- IOA.unsafeFreeze c'
return $ IStore (a, c)
i2m :: (MStore e) -> IStore e -> IO ()
i2m (MStore ref) (IStore (_, arr)) = do
(b, e, _) <- readIORef ref
a <- IOA.unsafeThaw arr
writeIORef ref (b, e, a)
withIStore :: MStore e -> (IStore e -> a) -> IO a
withIStore m f = do
i <- m2i m
let res = f i
res `seq` i2m m i
return res
withIStore2 :: MStore e1 -> MStore e2 -> (IStore e1 -> IStore e2 -> a) -> IO a
withIStore2 m1 m2 f = do
i1 <- m2i m1
i2 <- m2i m2
let res = f i1 i2
res `seq` i2m m1 i1
i2m m2 i2
return res
-- IStore code
(!) :: IStore e -> ElemIndex -> e
(!) (IStore (_, arr)) (ElemIndex i) = (IA.!) arr i
indices :: IStore e -> [ElemIndex]
indices (IStore (busy, _)) = map ElemIndex $ IntSet.toList busy