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TicTacToe.hs
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TicTacToe.hs
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{-# LANGUAGE MultiParamTypeClasses, TypeSynonymInstances #-}
module TicTacToe (runGame) where
import Control.Exception
import Data.Maybe
import AlphaBeta
data Value = X | O
deriving (Eq, Read, Show)
pretty :: Square -> (Maybe Value) -> String
pretty square (Just X) = "X"
pretty square (Just O) = "O"
pretty square Nothing = show square
data Board = Board (Maybe Value, Maybe Value, Maybe Value,
Maybe Value, Maybe Value, Maybe Value,
Maybe Value, Maybe Value, Maybe Value)
deriving Show
emptyBoard :: Board
emptyBoard = Board (Nothing, Nothing, Nothing, Nothing, Nothing, Nothing, Nothing, Nothing, Nothing)
prettyBoard :: Board -> String
prettyBoard (Board (tl, tc, tr, ml, mc, mr, bl, bc, br)) =
pretty 1 tl ++ "|" ++ pretty 2 tc ++ "|" ++ pretty 3 tr ++ "\n" ++
"-+-+-\n" ++
pretty 4 ml ++ "|" ++ pretty 5 mc ++ "|" ++ pretty 6 mr ++ "\n" ++
"-+-+-\n" ++
pretty 7 bl ++ "|" ++ pretty 8 bc ++ "|" ++ pretty 9 br
type Square = Int
play :: Board -> Square -> Value -> Maybe Board
play (Board (Nothing, tc, tr,
ml, mc, mr,
bl, bc, br)) 1 X = Just $ Board (Just X, tc, tr, ml, mc, mr, bl, bc, br)
play (Board (Nothing, tc, tr,
ml, mc, mr,
bl, bc, br)) 1 O = Just $ Board (Just O, tc, tr, ml, mc, mr, bl, bc, br)
play (Board (tl, Nothing, tr,
ml, mc, mr,
bl, bc, br)) 2 X = Just $ Board (tl, Just X, tr, ml, mc, mr, bl, bc, br)
play (Board (tl, Nothing, tr,
ml, mc, mr,
bl, bc, br)) 2 O = Just $ Board (tl, Just O, tr, ml, mc, mr, bl, bc, br)
play (Board (tl, tc, Nothing,
ml, mc, mr,
bl, bc, br)) 3 X = Just $ Board (tl, tc, Just X, ml, mc, mr, bl, bc, br)
play (Board (tl, tc, Nothing,
ml, mc, mr,
bl, bc, br)) 3 O = Just $ Board (tl, tc, Just O, ml, mc, mr, bl, bc, br)
play (Board (tl, tc, tr,
Nothing, mc, mr,
bl, bc, br)) 4 X = Just $ Board (tl, tc, tr, Just X, mc, mr, bl, bc, br)
play (Board (tl, tc, tr,
Nothing, mc, mr,
bl, bc, br)) 4 O = Just $ Board (tl, tc, tr, Just O, mc, mr, bl, bc, br)
play (Board (tl, tc, tr,
ml, Nothing, mr,
bl, bc, br)) 5 X = Just $ Board (tl, tc, tr, ml, Just X, mr, bl, bc, br)
play (Board (tl, tc, tr,
ml, Nothing, mr,
bl, bc, br)) 5 O = Just $ Board (tl, tc, tr, ml, Just O, mr, bl, bc, br)
play (Board (tl, tc, tr,
ml, mc, Nothing,
bl, bc, br)) 6 X = Just $ Board (tl, tc, tr, ml, mc, Just X, bl, bc, br)
play (Board (tl, tc, tr,
ml, mc, Nothing,
bl, bc, br)) 6 O = Just $ Board (tl, tc, tr, ml, mc, Just O, bl, bc, br)
play (Board (tl, tc, tr,
ml, mc, mr,
Nothing, bc, br)) 7 X = Just $ Board (tl, tc, tr, ml, mc, mr, Just X, bc, br)
play (Board (tl, tc, tr,
ml, mc, mr,
Nothing, bc, br)) 7 O = Just $ Board (tl, tc, tr, ml, mc, mr, Just O, bc, br)
play (Board (tl, tc, tr,
ml, mc, mr,
bl, Nothing, br)) 8 X = Just $ Board (tl, tc, tr, ml, mc, mr, bl, Just X, br)
play (Board (tl, tc, tr,
ml, mc, mr,
bl, Nothing, br)) 8 O = Just $ Board (tl, tc, tr, ml, mc, mr, bl, Just O, br)
play (Board (tl, tc, tr,
ml, mc, mr,
bl, bc, Nothing)) 9 X = Just $ Board (tl, tc, tr, ml, mc, mr, bl, bc, Just X)
play (Board (tl, tc, tr,
ml, mc, mr,
bl, bc, Nothing)) 9 O = Just $ Board (tl, tc, tr, ml, mc, mr, bl, bc, Just O)
play board _ _ = Nothing -- playing in occupied square
getWinner :: Board -> Maybe Value
getWinner (Board (Just X, Just X, Just X,
_, _, _,
_, _, _)) = Just X
getWinner (Board (Just O, Just O, Just O,
_, _, _,
_, _, _)) = Just O
getWinner (Board (_, _, _,
Just X, Just X, Just X,
_, _, _)) = Just X
getWinner (Board (_, _, _,
Just O, Just O, Just O,
_, _, _)) = Just O
getWinner (Board (_, _, _,
_, _, _,
Just X, Just X, Just X)) = Just X
getWinner (Board (_, _, _,
_, _, _,
Just O, Just O, Just O)) = Just O
getWinner (Board (Just X, _, _,
Just X, _, _,
Just X, _, _)) = Just X
getWinner (Board (Just O, _, _,
Just O, _, _,
Just O, _, _)) = Just O
getWinner (Board (_, Just X, _,
_, Just X, _,
_, Just X, _)) = Just X
getWinner (Board (_, Just O, _,
_, Just O, _,
_, Just O, _)) = Just O
getWinner (Board (_, _, Just X,
_, _, Just X,
_, _, Just X)) = Just X
getWinner (Board (_, _, Just O,
_, _, Just O,
_, _, Just O)) = Just O
getWinner (Board (Just X, _, _,
_, Just X, _,
_, _, Just X)) = Just X
getWinner (Board (Just O, _, _,
_, Just O, _,
_, _, Just O)) = Just O
getWinner (Board (_, _, Just X,
_, Just X, _,
Just X, _, _)) = Just X
getWinner (Board (_, _, Just O,
_, Just O, _,
Just O, _, _)) = Just O
getWinner _ = Nothing
isWinningBoard :: Board -> Bool
isWinningBoard board =
case getWinner board of
Nothing -> False
Just _ -> True
isEndGame :: Board -> Bool
isEndGame board@(Board (tl, tc, tr, ml, mc, mr, bl, bc, br)) =
isWinningBoard board || null (emptySquares board)
isEmpty :: Maybe Value -> Bool
isEmpty Nothing = True
isEmpty _ = False
square :: Board -> Square -> Maybe Value
square (Board (tl, _, _,
_, _, _,
_, _, _)) 1 = tl
square (Board (_, tc, _,
_, _, _,
_, _, _)) 2 = tc
square (Board (_, _, tr,
_, _, _,
_, _, _)) 3 = tr
square (Board (_, _, _,
ml, _, _,
_, _, _)) 4 = ml
square (Board (_, _, _,
_, mc, _,
_, _, _)) 5 = mc
square (Board (_, _, _,
_, _, mr,
_, _, _)) 6 = mr
square (Board (_, _, _,
_, _, _,
bl, _, _)) 7 = bl
square (Board (_, _, _,
_, _, _,
_, bc, _)) 8 = bc
square (Board (_, _, _,
_, _, _,
_, _, br)) 9 = br
allSquares :: [Square]
allSquares = [1 .. 9]
emptySquares :: Board -> [Square]
emptySquares board = [s | s <- allSquares, isEmpty $ square board s]
whoseTurn :: Board -> Value
whoseTurn board
| odd . length $ emptySquares board = X
| otherwise = O
type Move = (Square, Value)
instance MiniMax Board Move where
isTerminal board = isEndGame board
utility board | getWinner board == Just X = -1
| getWinner board == Just O = 1
| otherwise = 0
successors board =
map playMove $ emptySquares board
where playMove square = ((square, move), (fromJust (play board square move)))
move = whoseTurn board
anyTry :: IO a -> IO (Either SomeException a)
anyTry = try
readSquare :: String -> IO Square
readSquare prompt =
do putStrLn prompt
whereTo <- getLine
square <- anyTry (evaluate ((read whereTo) :: Square))
case square of
Left s -> readSquare prompt
Right s -> if 0 < s && s < 10
then return s
else readSquare prompt
yourMove :: Board -> IO Board
yourMove board =
do square <- readSquare "Your move (X):"
let board' = play board square X
case board' of
Nothing -> yourMove board
Just b -> do printBoard b
putStr "\n"
return b
myMove :: Board -> IO Board
myMove board =
do putStrLn "My move (O)..."
let (square, move) = decision board
let board' = fromJust (play board square move)
printBoard board'
putStr "\n"
return board'
gameLoop :: Board -> IO Board
gameLoop board =
do if isEndGame board
then return board
else do printBoard board
board' <- yourMove board
if isEndGame board'
then return board'
else gameLoop =<< myMove board'
printBoard :: Board -> IO ()
printBoard = putStrLn . prettyBoard
runGame :: IO ()
runGame =
do board <- gameLoop emptyBoard
putStr "GAME OVER: "
case getWinner board of
Just O -> putStrLn "I won!"
Just X -> putStrLn "You won!"
_ -> putStrLn "Draw."