MutableArray.hs

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module Feldspar.Core.Frontend.MutableArray
where

import Language.Syntactic

import Feldspar.Core.Types
import Feldspar.Core.Constructs
import Feldspar.Core.Constructs.Loop
import Feldspar.Core.Constructs.MutableArray
import Feldspar.Core.Frontend.Mutable

newArr :: Type a => Data Length -> Data a -> M (Data (MArr a))
newArr = sugarSymC NewArr

newArr_ :: Type a => Data Length -> M (Data (MArr a))
newArr_ = sugarSymC NewArr_

newListArr :: Type a => [Data a] -> M (Data (MArr a))
newListArr _ = error "newListArr: unimplemented" -- TODO

getArr :: Type a => Data (MArr a) -> Data Index -> M (Data a)
getArr = sugarSymC GetArr

setArr :: Type a => Data (MArr a) -> Data Index -> Data a -> M ()
setArr = sugarSymC SetArr

modifyArr :: Type a
          => Data (MArr a) -> Data Index -> (Data a -> Data a) -> M ()
modifyArr arr i f = getArr arr i >>= setArr arr i . f

arrLength :: Type a => Data (MArr a) -> M (Data Length)
arrLength = sugarSymC ArrLength

mapArray :: Type a => (Data a -> Data a) -> Data (MArr a) -> M (Data (MArr a))
mapArray f arr = do
    len <- arrLength arr
    forArr len (flip (modifyArr arr) f)
    return arr

forArr :: Syntax a => Data Length -> (Data Index -> M a) -> M ()
forArr = sugarSymC For

swap :: Syntax a
     => Data (MArr (Internal a)) -> Data Index -> Data Index -> M ()
swap a i1 i2 = do
    tmp1 <- getArr a i1
    tmp2 <- getArr a i2
    setArr a i1 tmp2 :: M ()
    setArr a i2 tmp1 :: M ()