Use @pokertools/engine and evaluator for poker rules and hand ranking
Replace the hand-rolled betting rules, side pots, showdown and hand evaluator with the published @pokertools/engine and @pokertools/evaluator libraries (MIT, pinned to 2.1.0). - server/hand.js now wraps a PokerEngine per hand: it maps seats, mirrors stacks, staggers the all-in runout, and pays host-chosen winners on cash-only tables. - server/cards.js and server/ai.js use the library evaluator. - Out-of-turn folds go through the engine's stand; all-in hands stay live when the player leaves; uncalled bets return to a leaver. - The engine refuses some check-able folds that would leave a side pot without eligible players; those now return a message (or check for a leaving player) instead of crashing. - BB must be greater than SB (engine requirement); Node >= 24. - Tests rig cards via engine snapshots and cover the new edge cases. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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@@ -1,96 +1,50 @@
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'use strict';
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const crypto = require('crypto');
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// 役の判定は @pokertools/evaluator（@pokertools/engine のショーダウンと同じ判定器）を使う。
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// ここでは表示用に、最強の5枚と日本語の役名を求める。
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// カードは "As"（スペードのA）, "Td"（ダイヤの10）のような2文字
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const RANKS = '23456789TJQKA';
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const SUITS = 'shdc';
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const { evaluate, getCardCodes, rank, HandRank } = require('@pokertools/evaluator');
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// 暗号論的乱数で Fisher-Yates シャッフル（山札はサーバの外に出さない）
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function newDeck() {
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const deck = [];
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for (const r of RANKS) for (const s of SUITS) deck.push(r + s);
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for (let i = deck.length - 1; i > 0; i--) {
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const j = crypto.randomInt(i + 1);
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[deck[i], deck[j]] = [deck[j], deck[i]];
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}
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return deck;
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}
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const HAND_NAMES = {
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[HandRank.HighCard]: 'ハイカード',
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[HandRank.OnePair]: 'ワンペア',
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[HandRank.TwoPair]: 'ツーペア',
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[HandRank.ThreeOfAKind]: 'スリーカード',
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[HandRank.Straight]: 'ストレート',
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[HandRank.Flush]: 'フラッシュ',
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[HandRank.FullHouse]: 'フルハウス',
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[HandRank.FourOfAKind]: 'フォーカード',
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[HandRank.StraightFlush]: 'ストレートフラッシュ',
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};
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const ROYAL_FLUSH = 1; // 判定器のスコアは小さいほど強く、1 がロイヤルフラッシュ
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const rankValue = (card) => RANKS.indexOf(card[0]) + 2;
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// 5枚の役の強さ。配列を先頭から比較して大きいほうが強い
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// [役の種類(0〜8), 比較用の数字...]
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function score5(cards) {
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const vals = cards.map(rankValue).sort((a, b) => b - a);
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const flush = cards.every((c) => c[1] === cards[0][1]);
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let straightHigh = 0;
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if (new Set(vals).size === 5) {
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if (vals[0] - vals[4] === 4) straightHigh = vals[0];
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else if (vals[0] === 14 && vals[1] === 5) straightHigh = 5; // A-2-3-4-5
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}
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if (straightHigh && flush) return [8, straightHigh];
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// 枚数の多い順、同じ枚数なら数字の大きい順
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const counts = new Map();
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for (const v of vals) counts.set(v, (counts.get(v) || 0) + 1);
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const groups = [...counts].sort((a, b) => b[1] - a[1] || b[0] - a[0]);
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const byGroup = groups.map((g) => g[0]);
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if (groups[0][1] === 4) return [7, ...byGroup];
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if (groups[0][1] === 3 && groups[1][1] === 2) return [6, ...byGroup];
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if (flush) return [5, ...vals];
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if (straightHigh) return [4, straightHigh];
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if (groups[0][1] === 3) return [3, ...byGroup];
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if (groups[0][1] === 2 && groups[1][1] === 2) return [2, ...byGroup];
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if (groups[0][1] === 2) return [1, ...byGroup];
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return [0, ...vals];
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}
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function compareScore(a, b) {
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for (let i = 0; i < Math.max(a.length, b.length); i++) {
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const d = (a[i] || 0) - (b[i] || 0);
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if (d) return d;
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}
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return 0;
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}
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const HAND_NAMES = [
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'ハイカード',
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'ワンペア',
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'ツーペア',
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'スリーカード',
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'ストレート',
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'フラッシュ',
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'フルハウス',
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'フォーカード',
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'ストレートフラッシュ',
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];
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function handName(score) {
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if (score[0] === 8 && score[1] === 14) return 'ロイヤルフラッシュ';
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return HAND_NAMES[score[0]];
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}
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// 5〜7枚から最も強い5枚を選ぶ
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// 5〜7枚の中で最も強い役。score は小さいほど強い
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function bestHand(cards) {
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let best = null;
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const n = cards.length;
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const pick = (start, chosen) => {
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if (chosen.length === 5) {
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const score = score5(chosen);
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if (!best || compareScore(score, best.score) > 0) best = { score, cards: chosen.slice() };
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return;
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}
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for (let i = start; i <= n - (5 - chosen.length); i++) {
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chosen.push(cards[i]);
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pick(i + 1, chosen);
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chosen.pop();
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}
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};
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pick(0, []);
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return best && { score: best.score, cards: best.cards, name: handName(best.score) };
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const codes = getCardCodes(cards);
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const score = evaluate(codes);
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const name = score === ROYAL_FLUSH ? 'ロイヤルフラッシュ' : HAND_NAMES[rank(codes)];
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// 役を作っている5枚（7枚から5枚を選ぶ21通りで、全体と同じ強さになる組）
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let five = cards.slice(0, 5);
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if (cards.length > 5) {
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const n = cards.length;
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const pick = (start, chosen) => {
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if (chosen.length === 5) return evaluate(chosen.map((i) => codes[i])) === score ? chosen.slice() : null;
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for (let i = start; i <= n - (5 - chosen.length); i++) {
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chosen.push(i);
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const found = pick(i + 1, chosen);
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chosen.pop();
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if (found) return found;
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}
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return null;
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};
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five = pick(0, []).map((i) => cards[i]);
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}
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return { score, cards: five, name };
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}
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module.exports = { newDeck, score5, compareScore, bestHand, handName };
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// a が強ければ正、b が強ければ負、同じ強さなら 0
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function compareScore(a, b) {
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return b - a;
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}
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module.exports = { bestHand, compareScore };
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