ritchie - v0.0.1

ritchie/engine/utils

Shared helpers for the engine.

Values

calc_nagashi_mangan_delta

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pub fn calc_nagashi_mangan_delta(
  nagashi_players: List(player.Player),
  button: player.Player,
) -> List(Int)

Calculates the payments for one or more nagashi mangan winners.

calc_pot_delta

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pub fn calc_pot_delta(
  riichi_flags: List(option.Option(riichi.Riichi)),
) -> List(Int)

Calculates the point deltas for each player who has declared riichi.

calc_wall_exhausted_delta

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pub fn calc_wall_exhausted_delta(waiting: List(Int)) -> List(Int)

Calculates the penalty deltas for a normal exhaustive draw.

ensure

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pub fn ensure(condition: Bool, error: e) -> Result(Nil, e)

Returns Ok(Nil) when the condition is true, otherwise returns the given error.

is_aborted_four_kan

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pub fn is_aborted_four_kan(
  state: state.State,
  act: action.Action,
  resolved_reaction: option.Option(reaction.Reaction),
) -> Bool

Is this action/reaction the fourth kan?

is_aborted_four_riichi

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pub fn is_aborted_four_riichi(
  state: state.State,
  act: action.Action,
) -> Bool

Is this discard the fourth riichi declaration?

is_aborted_four_wind

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pub fn is_aborted_four_wind(
  state: state.State,
  act: action.Action,
) -> Bool

Is this discard the fourth consecutive wind?

is_ankan_ok_under_riichi

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pub fn is_ankan_ok_under_riichi(
  rules: rules.Ruleset,
  pre_draw_hand: tile_set37.TileSet37,
  merged_hand: tile_set37.TileSet37,
  melds: List(meld.Meld),
  draw: option.Option(tile.Tile),
  ankan: tile.Tile,
) -> Bool

Is an ankan legal while under riichi?

is_first_chance

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pub fn is_first_chance(state: state.State) -> Bool

Are we in the first four turns of the round (without being interrupted by any meld)?

is_forbidden_swap_call

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pub fn is_forbidden_swap_call(
  rules: rules.Ruleset,
  called_meld: meld.Meld,
  discard_tile: tile.Tile,
) -> Bool

Is a discard immediately after calling chii/pon considered a swap call?

is_kokushi_wait

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

Whether the hand is waiting on this tile as kokushi musou.

is_last_draw

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pub fn is_last_draw(state: state.State) -> Bool

Are there any more draws available? This is the prerequisite condition for yakus haitei and houtei.

is_nagashi_mangan

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pub fn is_nagashi_mangan(
  state: state.State,
  p: player.Player,
) -> Bool

Does the player qualify for nagashi mangan at an exhaustive draw?

num_active_riichi

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pub fn num_active_riichi(state: state.State) -> Int

Number of players currently under riichi.

num_draws

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pub fn num_draws(state: state.State) -> Int

Returns the total number of tiles drawn from the wall, including the initial deal.

player_at

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pub fn player_at(items: List(a), p: player.Player) -> a

Returns the player at the specified position in the player list.

riichi_pot

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pub const riichi_pot: Int

Default point value of a riichi stick.

terminal_kinds

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pub fn terminal_kinds(hand: tile_set37.TileSet37) -> Int

Returns the number of distinct terminal and honor kinds in a hand.

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