tenpai

Tenpai detection and waiting-tile enumeration.

A tenpai hand is one tile away from completion. Since decompose already enumerates every waiting shape of such a hand, tenpai detection is the aggregation of the resulting waiting tiles.

Values

is_tenpai

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pub fn is_tenpai(
  hand: tile_set37.TileSet37,
  melds: List(meld.Meld),
) -> Bool

Returns whether the hand is tenpai (one tile away from completion).

waiting_tiles

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pub fn waiting_tiles(
  hand: tile_set37.TileSet37,
  melds: List(meld.Meld),
) -> List(tile.Tile)

Returns the distinct tiles that would complete the hand, in encoding order.

Waiting tiles are normal tiles: a wait on 0m is reported as 5m, since either copy completes the hand.

The hand must hold decompose.expected_hand_size(melds) concealed tiles, any other size has no waits.