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San Shoku Doujun

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This commit is contained in:
Correl Roush 2012-08-14 19:59:10 -04:00
parent 4438b8bc38
commit 7eab34d4cd
3 changed files with 32 additions and 3 deletions
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6
src/riichi_hand.erl
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@ -52,9 +52,11 @@ find(Tiles, Hand = #hand{tiles=HT, melds=HM}, Possible) ->
find(Rest, Hand#hand{tiles=[T|HT]}, Possible)
end.
-spec tiles(hand()) -> [tile()].
-spec tiles(hand() | meld()) -> [tile()].
tiles(#hand{tiles=Tiles, melds=Melds}) ->
lists:flatten([TS || #meld{tiles=TS} <- Melds]) ++ Tiles.
lists:flatten([TS || #meld{tiles=TS} <- Melds]) ++ Tiles;
tiles(#meld{tiles=Tiles}) ->
Tiles.
-spec head(hand()) -> meld() | none.
head(#hand{melds=Melds}) ->

19
src/yaku.erl
View file

@ -15,6 +15,7 @@
chanta/2,
itsuu/2,
chiitoitsu/2,
san_shoku_doujun/2,
kokushi_musou/2,
ryuu_iisou/2,
dai_san_gen/2]).
@ -112,6 +113,24 @@ itsuu(#game{}, #player{hand=#hand{tiles=[], melds=Melds}}) ->
sets:from_list([V || #tile{value=V} <- TS]) =:= sets:from_list(lists:seq(1,9))
end,
Runs).
%% @doc Returns true if the provided meld is present in the hand
%% in all three suits
-spec san_shoku(meld(), hand()) -> boolean().
san_shoku(#meld{tiles=Tiles}, #hand{melds=Melds}) ->
[V1, V2, V3] = [V || #tile{value=V} <- Tiles],
MeldTiles = [TS || #meld{tiles=TS} <- Melds],
TSV = fun(#tile{suit=S,value=V}) -> {S,V} end,
MeldValues = lists:map(fun(L) -> lists:map(TSV, L) end, MeldTiles),
lists:all(fun(M) -> lists:member(M, MeldValues) end,
[[{S, V1}, {S, V2}, {S, V3}]
|| S <- [pin, sou, man]]).
%% @doc Returns true for a San shoku doujun hand
%% Hand must contain the same sequence in all three suits
-spec san_shoku_doujun(game(), player()) -> boolean().
san_shoku_doujun(#game{}, #player{hand=#hand{melds=Melds}=Hand}) ->
Chiis = [M || #meld{type=chii} = M <- Melds],
lists:any(fun(M) -> san_shoku(M, Hand) end, Chiis).
%% @doc Returns true for a 7-pair hand.
-spec chiitoitsu(game(), player()) -> boolean().

8
test/riichi_yaku_tests.erl
View file

@ -60,6 +60,14 @@ itsuu_test() ->
#meld{type=chii, tiles=[#tile{suit=man, value=V} || V <- [6,7,8]]}]},
?assertEqual(true, yaku:itsuu(#game{}, #player{hand=Hand, drawn={tsumo, #tile{suit=dragon, value=red}}})).
san_shoku_doujun_test() ->
Hand = #hand{melds=[#meld{type=pair, tiles=lists:duplicate(2, #tile{suit=sou, value=8})},
#meld{type=chii, tiles=[#tile{suit=sou, value=V} || V <- [1,2,3]]},
#meld{type=chii, tiles=[#tile{suit=man, value=V} || V <- [1,2,3]]},
#meld{type=chii, tiles=[#tile{suit=pin, value=V} || V <- [1,2,3]]},
#meld{type=chii, tiles=[#tile{suit=man, value=V} || V <- [6,7,8]]}]},
?assertEqual(true, yaku:san_shoku_doujun(#game{}, #player{hand=Hand, drawn={tsumo, #tile{suit=dragon, value=red}}})).
chiitoitsu_test() ->
Hand = #hand{melds=[#meld{type=pair, tiles=lists:duplicate(2, #tile{suit=pin, value=V})} || V <- lists:seq(1,7)]},
?assertEqual(true, yaku:chiitoitsu(#game{}, #player{hand=Hand})).