blob: 8772011c7b40184b4336d337a10593dd516b189b (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
|
module Cafp.InfiniteDeck
( InfiniteDeck
, new
, newIO
, pop
, popN
) where
import Data.List (intercalate)
import qualified Data.Vector as V
import System.Random (StdGen, newStdGen)
import VectorShuffling.Immutable (shuffle)
newtype InfiniteDeck a = InfiniteDeck [a]
instance Show a => Show (InfiniteDeck a) where
show (InfiniteDeck xs) =
"[" ++ intercalate ", " (map show $ take 5 xs) ++ "...]"
new :: V.Vector a -> StdGen -> InfiniteDeck a
new vec gen0
| V.null vec = error "Cafp.InfiniteDeck.new: empty vector"
| otherwise = InfiniteDeck (V.toList x ++ xs)
where
(x, gen1) = shuffle vec gen0
InfiniteDeck xs = new vec gen1
newIO :: V.Vector a -> IO (InfiniteDeck a)
newIO vec = new vec <$> newStdGen
pop :: InfiniteDeck a -> (a, InfiniteDeck a)
pop (InfiniteDeck []) = error "Cafp.InfiniteDeck.pop: empty"
pop (InfiniteDeck (x : xs)) = (x, InfiniteDeck xs)
popN :: Int -> InfiniteDeck a -> ([a], InfiniteDeck a)
popN n (InfiniteDeck xs) = let (ys, zs) = splitAt n xs in (ys, InfiniteDeck zs)
|
