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Adding my Haskell code for easy reference and comparison
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build/* | ||
dist/* | ||
*.hi | ||
*.o | ||
RockPaperScissors |
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-- file: RockPaperScissors.hs | ||
-- Play a game of Rock, Paper, Scissors with a friend | ||
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import Control.Monad | ||
import System | ||
import System.IO | ||
import System.IO.Unsafe | ||
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data Player = Player String | ||
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data Throw = Rock | ||
| Paper | ||
| Scissors | ||
deriving (Show) | ||
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beats :: Throw -> Throw -> Bool | ||
Rock `beats` Scissors = True | ||
Paper `beats` Rock = True | ||
Scissors `beats` Paper = True | ||
_ `beats` _ = False | ||
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instance Read Throw where | ||
readsPrec _ value = tryParse [("R", Rock), ("P", Paper), ("S", Scissors)] | ||
where tryParse [] = [] | ||
tryParse ((attempt, result):xs) = if (take (length attempt) value) == attempt | ||
then [(result, drop (length attempt) value)] | ||
else tryParse xs | ||
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instance Show Player where | ||
show (Player name) = name | ||
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instance Read Player where | ||
readsPrec _ value = [((Player value), "")] | ||
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rpsRound :: (Player, Throw) -> (Player, Throw) -> (Int, Int) | ||
rpsRound (p1, t1) (p2, t2) | ||
| t1 `beats` t2 = (1, 0) | ||
| t2 `beats` t1 = (0, 1) | ||
| otherwise = (0, 0) | ||
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firstToWinBy :: Int -> Int -> (Player, Int) -> (Player, Int) -> Maybe Player | ||
firstToWinBy to by (p1, p1Score) (p2, p2Score) | ||
| (p1Score >= to) && ((p1Score - p2Score) >= by) = Just p1 | ||
| (p2Score >= to) && ((p2Score - p1Score) >= by) = Just p2 | ||
| otherwise = Nothing | ||
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firstTo :: Int -> (Player, Int) -> (Player, Int) -> Maybe Player | ||
firstTo x = firstToWinBy x 0 | ||
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bestOf :: Int -> (Player, Int) -> (Player, Int) -> Maybe Player | ||
bestOf x a b = firstTo x' a b | ||
where x' = (x `div` 2) + 1 | ||
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type WinLogic = (Player, Int) -> (Player, Int) -> Maybe Player | ||
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game :: WinLogic -> (Player, Int) -> (Player, Int) -> [Throw] -> [Throw] -> Player | ||
game getWinner (p1, p1Score) (p2, p2Score) p1Throws p2Throws = | ||
case (getWinner (p1, p1Score) (p2, p2Score)) of | ||
Nothing -> game getWinner (p1, p1Score') (p2, p2Score') t1s t2s | ||
Just winner -> winner | ||
where (t1:t1s) = p1Throws | ||
(t2:t2s) = p2Throws | ||
(p1RoundScore, p2RoundScore) = rpsRound (p1, t1) (p2, t2) | ||
(p1Score', p2Score') = (p1Score + p1RoundScore, p2Score + p2RoundScore) | ||
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getPlayer :: Int -> IO Player | ||
getPlayer i = do putStr prompt | ||
hFlush stdout | ||
read `liftM` getLine | ||
where prompt = "Player " ++ (show i) ++ " Name: " | ||
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getThrow :: IO Throw | ||
getThrow = do putStr prompt | ||
hFlush stdout | ||
read `liftM` getLine | ||
where prompt = "[R]ock, [P]aper, or [S]cissors? " | ||
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getAllThrows :: IO [Throw] | ||
getAllThrows = unsafeInterleaveIO $ do throw <- getThrow | ||
rest <- getAllThrows | ||
return (throw:rest) | ||
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getGameType :: [String] -> Either String WinLogic | ||
getGameType ["-to", to, "-by", by] = Right (firstToWinBy (read to) (read by)) | ||
getGameType ["-bestOf", x] = Right (bestOf (read x)) | ||
getGameType ["-to", x] = Right (firstTo (read x)) | ||
getGameType [] = Right (firstTo 1) | ||
getGameType _ = Left ("usage:\tRockPaperScissors -to to\n" ++ | ||
" \tRockPaperScissors -bestof x\n" ++ | ||
" \tRockPaperScissors -to to -by by") | ||
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stdIOGame :: WinLogic -> IO Player | ||
stdIOGame logic = do p1 <- getPlayer 1 | ||
p2 <- getPlayer 2 | ||
p1Throws <- getAllThrows | ||
p2Throws <- getAllThrows | ||
return $ game logic (p1, 0) (p2, 0) p1Throws p2Throws | ||
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main = do args <- getArgs | ||
case getGameType args of | ||
Left usage -> putStrLn usage | ||
Right logic -> do winner <- stdIOGame logic | ||
putStrLn $ (show winner) ++ " Wins!" |