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28 lines
1.2 KiB
28 lines
1.2 KiB
module Datatypes.Board (Board(..), clearLines) where
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import Data.Set (Set)
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import qualified Data.Set as Set
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import Datatypes.Cell (Cell)
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data Board = Board { width :: Int, height :: Int, filled :: Set Cell } deriving Show
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empty :: Int -> Int -> Board
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empty w h = Board w h Set.empty
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clearLines :: Board -> (Board, Int)
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clearLines b = let (newFilled, linesDeleted) = collectGarbage yCoords 0 (filled b)
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in (b { filled = newFilled }, linesDeleted)
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where
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yCoords = Set.toList $ Set.map (\(x, y) -> y) (filled b)
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countInLine l items = Set.size $ Set.filter (\(x, y) -> y == l) items
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collectGarbage (l:ls) count items = if countInLine l items == (width b)
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then collectGarbage ls (count + 1) (deleteLine l items)
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else collectGarbage ls count items
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collectGarbage [] count items = (items, count)
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-- PRIVATE
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deleteLine :: Int -> Set Cell -> Set Cell
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deleteLine l cells = let updated = Set.filter (\(x, y) -> y /= l) cells
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in Set.map (\(x, y) -> if y < l then (x, y + 1) else (x, y)) updated
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