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44 lines
939 B
Plaintext
44 lines
939 B
Plaintext
-- board piece
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type P = X | O | E
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type Board = Board P P P P P P P P P
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use Board Board
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use P O X E
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use Optional Some None
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orElse a b =
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case a of
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None -> b
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a -> a
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namespace P where
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(/=) : P -> P -> Boolean
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a /= b = not (a == b)
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(==) : P -> P -> Boolean
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a == b = case (a,b) of
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(X,X) -> true
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(O,O) -> true
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_ -> false
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isWin : Board -> Optional P
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isWin board =
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same : P -> P -> P -> Optional P
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same a b c = if and (and (a P.== b) (a P.== c)) (a P./= E)
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then Some a
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else None
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case board of
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-- vertical top/center/bottom
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-- horizontal left/center/right
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-- diagonal rising/falling
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Board a b c
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d e f
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g h i ->
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(same a b c `orElse` same d e f `orElse` same g h i `orElse`
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same a d g `orElse` same b e h `orElse` same c f i `orElse`
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same a e i `orElse` same g e c)
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isWin (Board X O X
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O X X
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O E X)
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