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37 lines
833 B
Plaintext
37 lines
833 B
Plaintext
-- board piece
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structural type P = X | O | E
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structural 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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a |> f = f a
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orElse a b =
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match a with
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None -> b
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a -> a
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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 (a == b) && (a == c) && (not (a == E))
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then Some a
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else None
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match board with
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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)
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|> orElse (same a d g) |> orElse (same b e h) |> orElse (same c f i)
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|> orElse (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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