Fix some complete rules
[xogo.git] / base_rules.js
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1import {Random} from "/utils/alea.js";
2import {ArrayFun} from "/utils/array.js";
0adfbdb5 3import {FenUtil} from "/utils/setupPieces.js";
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4import PiPo from "/utils/PiPo.js";
5import Move from "/utils/Move.js";
6
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7// Helper class for move animation
8class TargetObj {
9
10 constructor(callOnComplete) {
11 this.value = 0;
12 this.target = 0;
13 this.callOnComplete = callOnComplete;
14 }
15 increment() {
16 if (++this.value == this.target)
17 this.callOnComplete();
18 }
19
20};
21
41534b92 22// NOTE: x coords: top to bottom (white perspective); y: left to right
cc2c7183 23// NOTE: ChessRules is aliased as window.C, and variants as window.V
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24export default class ChessRules {
25
e5f93427 26 static get Aliases() {
3caec36f 27 return {'C': ChessRules};
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28 }
29
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30 /////////////////////////
31 // VARIANT SPECIFICATIONS
32
33 // Some variants have specific options, like the number of pawns in Monster,
34 // or the board size for Pandemonium.
35 // Users can generally select a randomness level from 0 to 2.
36 static get Options() {
37 return {
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38 select: [{
39 label: "Randomness",
40 variable: "randomness",
41 defaut: 0,
42 options: [
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43 {label: "Deterministic", value: 0},
44 {label: "Symmetric random", value: 1},
45 {label: "Asymmetric random", value: 2}
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46 ]
47 }],
437dfd42 48 input: [
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49 {
50 label: "Capture king",
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51 variable: "taking",
52 type: "checkbox",
53 defaut: false
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54 },
55 {
56 label: "Falling pawn",
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57 variable: "pawnfall",
58 type: "checkbox",
59 defaut: false
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60 }
61 ],
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62 // Game modifiers (using "elementary variants"). Default: false
63 styles: [
64 "atomic",
65 "balance", //takes precedence over doublemove & progressive
66 "cannibal",
67 "capture",
68 "crazyhouse",
69 "cylinder", //ok with all
70 "dark",
71 "doublemove",
72 "madrasi",
73 "progressive", //(natural) priority over doublemove
74 "recycle",
75 "rifle",
76 "teleport",
77 "zen"
78 ]
79 };
80 }
81
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82 get pawnPromotions() {
83 return ['q', 'r', 'n', 'b'];
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84 }
85
86 // Some variants don't have flags:
87 get hasFlags() {
88 return true;
89 }
90 // Or castle
91 get hasCastle() {
92 return this.hasFlags;
93 }
94
95 // En-passant captures allowed?
96 get hasEnpassant() {
97 return true;
98 }
99
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100 // Allow to take (moving: not disappearing) own pieces?
101 get hasSelfCaptures() {
102 return (
103 this.options["recycle"] ||
104 (this.options["teleport"] && this.subTurnTeleport == 1)
105 );
106 }
107
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108 get hasReserve() {
109 return (
110 !!this.options["crazyhouse"] ||
111 (!!this.options["recycle"] && !this.options["teleport"])
112 );
113 }
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114 // Some variants do not store reserve state (Align4, Chakart...)
115 get hasReserveFen() {
116 return this.hasReserve;
117 }
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118
119 get noAnimate() {
120 return !!this.options["dark"];
121 }
122
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123 // Some variants use only click information
124 get clickOnly() {
125 return false;
126 }
127
98d14451 128 // Some variants reveal moves only after both players played
126ffc70 129 get hideMoves() {
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130 return false;
131 }
132
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133 // Some variants do not flip board as black
134 get flippedBoard() {
135 return (this.playerColor == 'b');
136 }
137
41534b92 138 // Some variants use click infos:
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139 doClick(coords) {
140 if (typeof coords.x != "number")
b4ae3ff6 141 return null; //click on reserves
41534b92 142 if (
cc2c7183 143 this.options["teleport"] && this.subTurnTeleport == 2 &&
15106e82 144 this.board[coords.x][coords.y] == ""
41534b92 145 ) {
1a7c0492 146 let res = new Move({
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147 start: {x: this.captured.x, y: this.captured.y},
148 appear: [
149 new PiPo({
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150 x: coords.x,
151 y: coords.y,
ca8a3993 152 c: this.captured.c,
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153 p: this.captured.p
154 })
155 ],
1a7c0492 156 vanish: []
41534b92 157 });
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158 res.drag = {c: this.captured.c, p: this.captured.p};
159 return res;
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160 }
161 return null;
162 }
163
164 ////////////////////
165 // COORDINATES UTILS
166
4bff03f5 167 // 3a --> {x:3, y:10}
41534b92 168 static SquareToCoords(sq) {
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169 return ArrayFun.toObject(["x", "y"],
170 [0, 1].map(i => parseInt(sq[i], 36)));
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171 }
172
4bff03f5 173 // {x:11, y:12} --> bc
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174 static CoordsToSquare(cd) {
175 return Object.values(cd).map(c => c.toString(36)).join("");
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176 }
177
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178 coordsToId(cd) {
179 if (typeof cd.x == "number") {
180 return (
181 `${this.containerId}|sq-${cd.x.toString(36)}-${cd.y.toString(36)}`
182 );
183 }
41534b92 184 // Reserve :
15106e82 185 return `${this.containerId}|rsq-${cd.x}-${cd.y}`;
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186 }
187
188 idToCoords(targetId) {
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189 if (!targetId)
190 return null; //outside page, maybe...
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191 const idParts = targetId.split('|'); //prefix|sq-2-3 (start at 0 => 3,4)
192 if (
193 idParts.length < 2 ||
194 idParts[0] != this.containerId ||
195 !idParts[1].match(/sq-[0-9a-zA-Z]-[0-9a-zA-Z]/)
196 ) {
197 return null;
198 }
199 const squares = idParts[1].split('-');
200 if (squares[0] == "sq")
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201 return {x: parseInt(squares[1], 36), y: parseInt(squares[2], 36)};
202 // squares[0] == "rsq" : reserve, 'c' + 'p' (letters color & piece)
203 return {x: squares[1], y: squares[2]};
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204 }
205
206 /////////////
207 // FEN UTILS
208
209 // Turn "wb" into "B" (for FEN)
210 board2fen(b) {
4bff03f5 211 return (b[0] == "w" ? b[1].toUpperCase() : b[1]);
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212 }
213
214 // Turn "p" into "bp" (for board)
215 fen2board(f) {
4bff03f5 216 return (f.charCodeAt(0) <= 90 ? "w" + f.toLowerCase() : "b" + f);
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217 }
218
41534b92 219 genRandInitFen(seed) {
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220 Random.setSeed(seed); //may be unused
221 let baseFen = this.genRandInitBaseFen();
222 baseFen.o = Object.assign({init: true}, baseFen.o);
223 const parts = this.getPartFen(baseFen.o);
224 return (
dc10e429 225 baseFen.fen + " w 0" +
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226 (Object.keys(parts).length > 0 ? (" " + JSON.stringify(parts)) : "")
227 );
228 }
229
230 // Setup the initial random-or-not (asymmetric-or-not) position
231 genRandInitBaseFen() {
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232 const s = FenUtil.setupPieces(
233 ['r', 'n', 'b', 'q', 'k', 'b', 'n', 'r'],
234 {
10c9010b 235 randomness: this.options["randomness"],
52718c94 236 between: [{p1: 'k', p2: 'r'}],
7c038235 237 diffCol: ['b'],
2c8375bb 238 flags: ['r']
41534b92 239 }
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240 );
241 return {
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242 fen: s.b.join("") + "/pppppppp/8/8/8/8/PPPPPPPP/" +
243 s.w.join("").toUpperCase(),
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244 o: {flags: s.flags}
245 };
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246 }
247
248 // "Parse" FEN: just return untransformed string data
249 parseFen(fen) {
250 const fenParts = fen.split(" ");
251 let res = {
252 position: fenParts[0],
253 turn: fenParts[1],
254 movesCount: fenParts[2]
255 };
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256 if (fenParts.length > 3)
257 res = Object.assign(res, JSON.parse(fenParts[3]));
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258 return res;
259 }
260
261 // Return current fen (game state)
262 getFen() {
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263 const parts = this.getPartFen({});
264 return (
265 this.getBaseFen() +
266 (Object.keys(parts).length > 0 ? (" " + JSON.stringify(parts)) : "")
41534b92 267 );
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268 }
269
270 getBaseFen() {
271 return this.getPosition() + " " + this.turn + " " + this.movesCount;
272 }
273
274 getPartFen(o) {
275 let parts = {};
b4ae3ff6 276 if (this.hasFlags)
f31de5e4 277 parts["flags"] = o.init ? o.flags : this.getFlagsFen();
41534b92 278 if (this.hasEnpassant)
f31de5e4 279 parts["enpassant"] = o.init ? "-" : this.getEnpassantFen();
24872b22 280 if (this.hasReserveFen)
f31de5e4 281 parts["reserve"] = this.getReserveFen(o);
41534b92 282 if (this.options["crazyhouse"])
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283 parts["ispawn"] = this.getIspawnFen(o);
284 return parts;
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285 }
286
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287 static FenEmptySquares(count) {
288 // if more than 9 consecutive free spaces, break the integer,
289 // otherwise FEN parsing will fail.
290 if (count <= 9)
291 return count;
292 // Most boards of size < 18:
293 if (count <= 18)
294 return "9" + (count - 9);
295 // Except Gomoku:
296 return "99" + (count - 18);
297 }
298
41534b92 299 // Position part of the FEN string
15106e82 300 getPosition() {
41534b92 301 let position = "";
55d3b31f 302 for (let i = 0; i < this.size.x; i++) {
41534b92 303 let emptyCount = 0;
55d3b31f 304 for (let j = 0; j < this.size.y; j++) {
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305 if (this.board[i][j] == "")
306 emptyCount++;
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307 else {
308 if (emptyCount > 0) {
309 // Add empty squares in-between
d621e620 310 position += C.FenEmptySquares(emptyCount);
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311 emptyCount = 0;
312 }
313 position += this.board2fen(this.board[i][j]);
314 }
315 }
316 if (emptyCount > 0)
317 // "Flush remainder"
d621e620 318 position += C.FenEmptySquares(emptyCount);
55d3b31f 319 if (i < this.size.x - 1)
b4ae3ff6 320 position += "/"; //separate rows
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321 }
322 return position;
323 }
324
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325 // Flags part of the FEN string
326 getFlagsFen() {
3ca47832 327 return ['w', 'b'].map(c => {
15106e82 328 return this.castleFlags[c].map(x => x.toString(36)).join("");
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329 }).join("");
330 }
331
332 // Enpassant part of the FEN string
333 getEnpassantFen() {
b4ae3ff6 334 if (!this.epSquare)
f31de5e4 335 return "-";
cc2c7183 336 return C.CoordsToSquare(this.epSquare);
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337 }
338
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339 getReserveFen(o) {
340 if (o.init)
341 return "000000000000";
41534b92 342 return (
3ca47832 343 ['w', 'b'].map(c => Object.values(this.reserve[c]).join("")).join("")
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344 );
345 }
346
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347 getIspawnFen(o) {
348 if (o.init)
349 // NOTE: cannot merge because this.ispawn doesn't exist yet
350 return "-";
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351 const squares = Object.keys(this.ispawn);
352 if (squares.length == 0)
b4ae3ff6 353 return "-";
15106e82 354 return squares.join(",");
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355 }
356
357 // Set flags from fen (castle: white a,h then black a,h)
358 setFlags(fenflags) {
359 this.castleFlags = {
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360 w: [0, 1].map(i => parseInt(fenflags.charAt(i), 36)),
361 b: [2, 3].map(i => parseInt(fenflags.charAt(i), 36))
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362 };
363 }
364
365 //////////////////
366 // INITIALIZATION
367
bc2bc396 368 constructor(o) {
41534b92 369 this.options = o.options;
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370 // Fill missing options (always the case if random challenge)
371 (V.Options.select || []).concat(V.Options.input || []).forEach(opt => {
372 if (this.options[opt.variable] === undefined)
373 this.options[opt.variable] = opt.defaut;
374 });
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375
376 // Some variables
41534b92 377 this.playerColor = o.color;
15106e82 378 this.afterPlay = o.afterPlay; //trigger some actions after playing a move
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379 this.containerId = o.element;
380 this.isDiagram = o.diagram;
381 this.marks = o.marks;
41534b92 382
f31de5e4 383 // Initializations
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384 if (!o.fen)
385 o.fen = this.genRandInitFen(o.seed);
5f08c59b 386 this.re_initFromFen(o.fen);
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387 this.graphicalInit();
388 }
389
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390 re_initFromFen(fen, oldBoard) {
391 const fenParsed = this.parseFen(fen);
392 this.board = oldBoard || this.getBoard(fenParsed.position);
393 this.turn = fenParsed.turn;
394 this.movesCount = parseInt(fenParsed.movesCount, 10);
395 this.setOtherVariables(fenParsed);
396 }
397
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398 // Turn position fen into double array ["wb","wp","bk",...]
399 getBoard(position) {
400 const rows = position.split("/");
401 let board = ArrayFun.init(this.size.x, this.size.y, "");
402 for (let i = 0; i < rows.length; i++) {
403 let j = 0;
404 for (let indexInRow = 0; indexInRow < rows[i].length; indexInRow++) {
405 const character = rows[i][indexInRow];
406 const num = parseInt(character, 10);
407 // If num is a number, just shift j:
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408 if (!isNaN(num))
409 j += num;
41534b92 410 // Else: something at position i,j
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411 else
412 board[i][j++] = this.fen2board(character);
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413 }
414 }
415 return board;
416 }
417
418 // Some additional variables from FEN (variant dependant)
6bf2ab34 419 setOtherVariables(fenParsed, pieceArray) {
41534b92 420 // Set flags and enpassant:
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421 if (this.hasFlags)
422 this.setFlags(fenParsed.flags);
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423 if (this.hasEnpassant)
424 this.epSquare = this.getEpSquare(fenParsed.enpassant);
549ca151 425 if (this.hasReserve && !this.isDiagram)
6bf2ab34 426 this.initReserves(fenParsed.reserve, pieceArray);
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427 if (this.options["crazyhouse"])
428 this.initIspawn(fenParsed.ispawn);
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429 if (this.options["teleport"]) {
430 this.subTurnTeleport = 1;
431 this.captured = null;
432 }
41534b92 433 if (this.options["dark"]) {
41534b92 434 // Setup enlightened: squares reachable by player side
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435 this.enlightened = ArrayFun.init(this.size.x, this.size.y, false);
436 this.updateEnlightened();
41534b92 437 }
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438 this.subTurn = 1; //may be unused
439 if (!this.moveStack) //avoid resetting (unwanted)
440 this.moveStack = [];
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441 }
442
ca8a3993 443 // ordering as in pieces() p,r,n,b,q,k
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444 initReserves(reserveStr, pieceArray) {
445 if (!pieceArray)
446 pieceArray = ['p', 'r', 'n', 'b', 'q', 'k'];
ca8a3993 447 const counts = reserveStr.split("").map(c => parseInt(c, 36));
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448 const L = pieceArray.length;
449 this.reserve = {
450 w: ArrayFun.toObject(pieceArray, counts.slice(0, L)),
451 b: ArrayFun.toObject(pieceArray, counts.slice(L, 2 * L))
452 };
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453 }
454
455 initIspawn(ispawnStr) {
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456 if (ispawnStr != "-")
457 this.ispawn = ArrayFun.toObject(ispawnStr.split(","), true);
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458 else
459 this.ispawn = {};
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460 }
461
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462 ////////////////
463 // VISUAL UTILS
464
465 getPieceWidth(rwidth) {
466 return (rwidth / this.size.y);
467 }
468
469 getReserveSquareSize(rwidth, nbR) {
470 const sqSize = this.getPieceWidth(rwidth);
471 return Math.min(sqSize, rwidth / nbR);
472 }
473
474 getReserveNumId(color, piece) {
475 return `${this.containerId}|rnum-${color}${piece}`;
476 }
477
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478 getNbReservePieces(color) {
479 return (
480 Object.values(this.reserve[color]).reduce(
481 (oldV,newV) => oldV + (newV > 0 ? 1 : 0), 0)
482 );
483 }
484
15106e82 485 getRankInReserve(c, p) {
ceeac4e8 486 const pieces = Object.keys(this.pieces(c, c, p));
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487 const lastIndex = pieces.findIndex(pp => pp == p)
488 let toTest = pieces.slice(0, lastIndex);
489 return toTest.reduce(
490 (oldV,newV) => oldV + (this.reserve[c][newV] > 0 ? 1 : 0), 0);
491 }
492
9b760538 493 static AddClass_es(elt, class_es) {
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494 if (!Array.isArray(class_es))
495 class_es = [class_es];
9b760538 496 class_es.forEach(cl => elt.classList.add(cl));
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497 }
498
9b760538 499 static RemoveClass_es(elt, class_es) {
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500 if (!Array.isArray(class_es))
501 class_es = [class_es];
9b760538 502 class_es.forEach(cl => elt.classList.remove(cl));
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503 }
504
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505 // Generally light square bottom-right
506 getSquareColorClass(x, y) {
507 return ((x+y) % 2 == 0 ? "light-square": "dark-square");
508 }
509
510 getMaxDistance(r) {
511 // Works for all rectangular boards:
512 return Math.sqrt(r.width ** 2 + r.height ** 2);
513 }
514
515 getDomPiece(x, y) {
516 return (typeof x == "string" ? this.r_pieces : this.g_pieces)[x][y];
517 }
518
519 //////////////////
520 // VISUAL METHODS
521
41534b92 522 graphicalInit() {
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523 const g_init = () => {
524 this.re_drawBoardElements();
549ca151 525 if (!this.isDiagram && !this.mouseListeners && !this.touchListeners)
5abaabb3 526 this.initMouseEvents();
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527 };
528 let container = document.getElementById(this.containerId);
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529 this.windowResizeObs = new ResizeObserver(g_init);
530 this.windowResizeObs.observe(container);
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531 }
532
533 re_drawBoardElements() {
534 const board = this.getSvgChessboard();
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535 const container = document.getElementById(this.containerId);
536 const rc = container.getBoundingClientRect();
537 let chessboard = container.querySelector(".chessboard");
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538 chessboard.innerHTML = "";
539 chessboard.insertAdjacentHTML('beforeend', board);
41534b92 540 // Compare window ratio width / height to aspectRatio:
e7b64798 541 const windowRatio = rc.width / rc.height;
41534b92 542 let cbWidth, cbHeight;
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543 const vRatio = this.size.ratio || 1;
544 if (windowRatio <= vRatio) {
41534b92 545 // Limiting dimension is width:
e7b64798 546 cbWidth = Math.min(rc.width, 767);
f55a0a67 547 cbHeight = cbWidth / vRatio;
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548 }
549 else {
550 // Limiting dimension is height:
e7b64798 551 cbHeight = Math.min(rc.height, 767);
f55a0a67 552 cbWidth = cbHeight * vRatio;
41534b92 553 }
549ca151 554 if (this.hasReserve && !this.isDiagram) {
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555 const sqSize = cbWidth / this.size.y;
556 // NOTE: allocate space for reserves (up/down) even if they are empty
15106e82 557 // Cannot use getReserveSquareSize() here, but sqSize is an upper bound.
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558 if ((rc.height - cbHeight) / 2 < sqSize + 5) {
559 cbHeight = rc.height - 2 * (sqSize + 5);
f55a0a67 560 cbWidth = cbHeight * vRatio;
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561 }
562 }
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563 chessboard.style.width = cbWidth + "px";
564 chessboard.style.height = cbHeight + "px";
41534b92 565 // Center chessboard:
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566 const spaceLeft = (rc.width - cbWidth) / 2,
567 spaceTop = (rc.height - cbHeight) / 2;
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568 chessboard.style.left = spaceLeft + "px";
569 chessboard.style.top = spaceTop + "px";
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570 // Give sizes instead of recomputing them,
571 // because chessboard might not be drawn yet.
10c9010b 572 this.setupVisualPieces({
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573 width: cbWidth,
574 height: cbHeight,
575 x: spaceLeft,
576 y: spaceTop
577 });
578 }
579
580 // Get SVG board (background, no pieces)
581 getSvgChessboard() {
65203419 582 const flipped = this.flippedBoard;
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583 let board = `
584 <svg
f55a0a67 585 viewBox="0 0 ${10*this.size.y} ${10*this.size.x}"
535c464b 586 class="chessboard_SVG">`;
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587 for (let i=0; i < this.size.x; i++) {
588 for (let j=0; j < this.size.y; j++) {
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589 if (!this.onBoard(i, j))
590 continue;
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591 const ii = (flipped ? this.size.x - 1 - i : i);
592 const jj = (flipped ? this.size.y - 1 - j : j);
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593 let classes = this.getSquareColorClass(ii, jj);
594 if (this.enlightened && !this.enlightened[ii][jj])
595 classes += " in-shadow";
41534b92 596 // NOTE: x / y reversed because coordinates system is reversed.
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597 board += `
598 <rect
599 class="${classes}"
600 id="${this.coordsToId({x: ii, y: jj})}"
601 width="10"
602 height="10"
603 x="${10*j}"
604 y="${10*i}"
605 />`;
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606 }
607 }
535c464b 608 board += "</svg>";
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BA
609 return board;
610 }
611
10c9010b 612 setupVisualPieces(r) {
3c61449b
BA
613 let chessboard =
614 document.getElementById(this.containerId).querySelector(".chessboard");
b4ae3ff6
BA
615 if (!r)
616 r = chessboard.getBoundingClientRect();
41534b92 617 const pieceWidth = this.getPieceWidth(r.width);
b2fc1259
BA
618 const addPiece = (i, j, arrName, classes) => {
619 this[arrName][i][j] = document.createElement("piece");
620 C.AddClass_es(this[arrName][i][j], classes);
621 this[arrName][i][j].style.width = pieceWidth + "px";
622 this[arrName][i][j].style.height = pieceWidth + "px";
623 let [ip, jp] = this.getPixelPosition(i, j, r);
624 // Translate coordinates to use chessboard as reference:
625 this[arrName][i][j].style.transform =
626 `translate(${ip - r.x}px,${jp - r.y}px)`;
627 chessboard.appendChild(this[arrName][i][j]);
628 };
629 const conditionalReset = (arrName) => {
630 if (this[arrName]) {
631 // Refreshing: delete old pieces first. This isn't necessary,
632 // but simpler (this method isn't called many times)
633 for (let i=0; i<this.size.x; i++) {
634 for (let j=0; j<this.size.y; j++) {
635 if (this[arrName][i][j]) {
636 this[arrName][i][j].remove();
637 this[arrName][i][j] = null;
638 }
639 }
640 }
641 }
642 else
643 this[arrName] = ArrayFun.init(this.size.x, this.size.y, null);
644 if (arrName == "d_pieces")
2c8375bb
BA
645 this.marks.forEach((m) => {
646 const formattedSquare =
647 (this.size.x - parseInt(m.substring(1), 10)).toString(36) +
648 (m.charCodeAt(0) - 97).toString(36);
649 const mCoords = V.SquareToCoords(formattedSquare);
650 addPiece(mCoords.x, mCoords.y, arrName, "mark");
651 });
b2fc1259
BA
652 };
653 if (this.marks)
654 conditionalReset("d_pieces");
655 conditionalReset("g_pieces");
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656 for (let i=0; i < this.size.x; i++) {
657 for (let j=0; j < this.size.y; j++) {
c9ab0340 658 if (this.board[i][j] != "") {
41534b92 659 const color = this.getColor(i, j);
cc2c7183 660 const piece = this.getPiece(i, j);
b2fc1259 661 addPiece(i, j, "g_pieces", this.pieces(color, i, j)[piece]["class"]);
616a8d7a 662 this.g_pieces[i][j].classList.add(V.GetColorClass(color));
c9ab0340
BA
663 if (this.enlightened && !this.enlightened[i][j])
664 this.g_pieces[i][j].classList.add("hidden");
b2fc1259
BA
665 }
666 if (this.marks && this.d_pieces[i][j]) {
667 let classes = ["mark"];
668 if (this.board[i][j] != "")
669 classes.push("transparent");
670 addPiece(i, j, "d_pieces", classes);
41534b92
BA
671 }
672 }
673 }
549ca151 674 if (this.hasReserve && !this.isDiagram)
b4ae3ff6 675 this.re_drawReserve(['w', 'b'], r);
41534b92
BA
676 }
677
24872b22 678 // NOTE: assume this.reserve != null
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679 re_drawReserve(colors, r) {
680 if (this.r_pieces) {
681 // Remove (old) reserve pieces
682 for (let c of colors) {
24872b22
BA
683 Object.keys(this.r_pieces[c]).forEach(p => {
684 this.r_pieces[c][p].remove();
685 delete this.r_pieces[c][p];
686 const numId = this.getReserveNumId(c, p);
687 document.getElementById(numId).remove();
41534b92 688 });
41534b92
BA
689 }
690 }
b4ae3ff6 691 else
9db5050a
BA
692 this.r_pieces = { w: {}, b: {} };
693 let container = document.getElementById(this.containerId);
b4ae3ff6 694 if (!r)
9db5050a 695 r = container.querySelector(".chessboard").getBoundingClientRect();
41534b92 696 for (let c of colors) {
24872b22
BA
697 let reservesDiv = document.getElementById("reserves_" + c);
698 if (reservesDiv)
699 reservesDiv.remove();
b4ae3ff6
BA
700 if (!this.reserve[c])
701 continue;
41534b92 702 const nbR = this.getNbReservePieces(c);
b4ae3ff6
BA
703 if (nbR == 0)
704 continue;
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BA
705 const sqResSize = this.getReserveSquareSize(r.width, nbR);
706 let ridx = 0;
707 const vShift = (c == this.playerColor ? r.height + 5 : -sqResSize - 5);
708 const [i0, j0] = [r.x, r.y + vShift];
709 let rcontainer = document.createElement("div");
710 rcontainer.id = "reserves_" + c;
711 rcontainer.classList.add("reserves");
712 rcontainer.style.left = i0 + "px";
713 rcontainer.style.top = j0 + "px";
1aa9054d
BA
714 // NOTE: +1 fix display bug on Firefox at least
715 rcontainer.style.width = (nbR * sqResSize + 1) + "px";
41534b92 716 rcontainer.style.height = sqResSize + "px";
9db5050a 717 container.appendChild(rcontainer);
41534b92 718 for (let p of Object.keys(this.reserve[c])) {
b4ae3ff6
BA
719 if (this.reserve[c][p] == 0)
720 continue;
41534b92 721 let r_cell = document.createElement("div");
15106e82 722 r_cell.id = this.coordsToId({x: c, y: p});
41534b92 723 r_cell.classList.add("reserve-cell");
1aa9054d
BA
724 r_cell.style.width = sqResSize + "px";
725 r_cell.style.height = sqResSize + "px";
41534b92
BA
726 rcontainer.appendChild(r_cell);
727 let piece = document.createElement("piece");
2159c239 728 C.AddClass_es(piece, this.pieces(c, c, p)[p]["class"]);
616a8d7a 729 piece.classList.add(V.GetColorClass(c));
41534b92
BA
730 piece.style.width = "100%";
731 piece.style.height = "100%";
732 this.r_pieces[c][p] = piece;
733 r_cell.appendChild(piece);
734 let number = document.createElement("div");
735 number.textContent = this.reserve[c][p];
736 number.classList.add("reserve-num");
737 number.id = this.getReserveNumId(c, p);
738 const fontSize = "1.3em";
739 number.style.fontSize = fontSize;
740 number.style.fontSize = fontSize;
741 r_cell.appendChild(number);
742 ridx++;
743 }
744 }
745 }
746
747 updateReserve(color, piece, count) {
55a15dcb 748 if (this.options["cannibal"] && C.CannibalKings[piece])
cc2c7183 749 piece = "k"; //capturing cannibal king: back to king form
41534b92
BA
750 const oldCount = this.reserve[color][piece];
751 this.reserve[color][piece] = count;
182ba661
BA
752 // Redrawing is much easier if count==0 (or undefined)
753 if ([oldCount, count].some(item => !item))
b4ae3ff6 754 this.re_drawReserve([color]);
41534b92
BA
755 else {
756 const numId = this.getReserveNumId(color, piece);
757 document.getElementById(numId).textContent = count;
758 }
759 }
760
c4e9bb92
BA
761 // Resize board: no need to destroy/recreate pieces
762 rescale(mode) {
e7b64798
BA
763 const container = document.getElementById(this.containerId);
764 let chessboard = container.querySelector(".chessboard");
765 const rc = container.getBoundingClientRect(),
766 r = chessboard.getBoundingClientRect();
c4e9bb92
BA
767 const multFact = (mode == "up" ? 1.05 : 0.95);
768 let [newWidth, newHeight] = [multFact * r.width, multFact * r.height];
535c464b 769 // Stay in window:
f55a0a67 770 const vRatio = this.size.ratio || 1;
e7b64798
BA
771 if (newWidth > rc.width) {
772 newWidth = rc.width;
f55a0a67 773 newHeight = newWidth / vRatio;
c4e9bb92 774 }
e7b64798
BA
775 if (newHeight > rc.height) {
776 newHeight = rc.height;
f55a0a67 777 newWidth = newHeight * vRatio;
c4e9bb92 778 }
535c464b
BA
779 chessboard.style.width = newWidth + "px";
780 chessboard.style.height = newHeight + "px";
e7b64798 781 const newX = (rc.width - newWidth) / 2;
3c61449b 782 chessboard.style.left = newX + "px";
e7b64798 783 const newY = (rc.height - newHeight) / 2;
3c61449b 784 chessboard.style.top = newY + "px";
9db5050a 785 const newR = {x: newX, y: newY, width: newWidth, height: newHeight};
c4e9bb92 786 const pieceWidth = this.getPieceWidth(newWidth);
d621e620
BA
787 // NOTE: next "if" for variants which use squares filling
788 // instead of "physical", moving pieces
789 if (this.g_pieces) {
c4e9bb92
BA
790 for (let i=0; i < this.size.x; i++) {
791 for (let j=0; j < this.size.y; j++) {
792 if (this.g_pieces[i][j]) {
d621e620 793 // NOTE: could also use CSS transform "scale"
c4e9bb92
BA
794 this.g_pieces[i][j].style.width = pieceWidth + "px";
795 this.g_pieces[i][j].style.height = pieceWidth + "px";
796 const [ip, jp] = this.getPixelPosition(i, j, newR);
d621e620 797 // Translate coordinates to use chessboard as reference:
c4e9bb92 798 this.g_pieces[i][j].style.transform =
d621e620
BA
799 `translate(${ip - newX}px,${jp - newY}px)`;
800 }
41534b92
BA
801 }
802 }
803 }
b2fc1259 804 if (this.hasReserve)
c4e9bb92 805 this.rescaleReserve(newR);
41534b92
BA
806 }
807
808 rescaleReserve(r) {
41534b92 809 for (let c of ['w','b']) {
b4ae3ff6
BA
810 if (!this.reserve[c])
811 continue;
41534b92 812 const nbR = this.getNbReservePieces(c);
b4ae3ff6
BA
813 if (nbR == 0)
814 continue;
41534b92
BA
815 // Resize container first
816 const sqResSize = this.getReserveSquareSize(r.width, nbR);
817 const vShift = (c == this.playerColor ? r.height + 5 : -sqResSize - 5);
818 const [i0, j0] = [r.x, r.y + vShift];
819 let rcontainer = document.getElementById("reserves_" + c);
820 rcontainer.style.left = i0 + "px";
821 rcontainer.style.top = j0 + "px";
1aa9054d 822 rcontainer.style.width = (nbR * sqResSize + 1) + "px";
41534b92
BA
823 rcontainer.style.height = sqResSize + "px";
824 // And then reserve cells:
825 const rpieceWidth = this.getReserveSquareSize(r.width, nbR);
826 Object.keys(this.reserve[c]).forEach(p => {
b4ae3ff6
BA
827 if (this.reserve[c][p] == 0)
828 return;
15106e82 829 let r_cell = document.getElementById(this.coordsToId({x: c, y: p}));
1aa9054d
BA
830 r_cell.style.width = sqResSize + "px";
831 r_cell.style.height = sqResSize + "px";
41534b92
BA
832 });
833 }
834 }
835
9db5050a 836 // Return the absolute pixel coordinates given current position.
41534b92
BA
837 // Our coordinate system differs from CSS one (x <--> y).
838 // We return here the CSS coordinates (more useful).
839 getPixelPosition(i, j, r) {
b4ae3ff6
BA
840 if (i < 0 || j < 0)
841 return [0, 0]; //piece vanishes
15106e82
BA
842 let x, y;
843 if (typeof i == "string") {
844 // Reserves: need to know the rank of piece
845 const nbR = this.getNbReservePieces(i);
846 const rsqSize = this.getReserveSquareSize(r.width, nbR);
847 x = this.getRankInReserve(i, j) * rsqSize;
848 y = (this.playerColor == i ? y = r.height + 5 : - 5 - rsqSize);
849 }
850 else {
851 const sqSize = r.width / this.size.y;
65203419 852 const flipped = this.flippedBoard;
15106e82
BA
853 x = (flipped ? this.size.y - 1 - j : j) * sqSize;
854 y = (flipped ? this.size.x - 1 - i : i) * sqSize;
855 }
9db5050a 856 return [r.x + x, r.y + y];
41534b92
BA
857 }
858
859 initMouseEvents() {
9db5050a
BA
860 let container = document.getElementById(this.containerId);
861 let chessboard = container.querySelector(".chessboard");
41534b92
BA
862
863 const getOffset = e => {
3c61449b
BA
864 if (e.clientX)
865 // Mouse
866 return {x: e.clientX, y: e.clientY};
41534b92
BA
867 let touchLocation = null;
868 if (e.targetTouches && e.targetTouches.length >= 1)
869 // Touch screen, dragstart
870 touchLocation = e.targetTouches[0];
871 else if (e.changedTouches && e.changedTouches.length >= 1)
872 // Touch screen, dragend
873 touchLocation = e.changedTouches[0];
874 if (touchLocation)
11625344 875 return {x: touchLocation.clientX, y: touchLocation.clientY};
57b8015b 876 return {x: 0, y: 0}; //shouldn't reach here =)
41534b92
BA
877 }
878
879 const centerOnCursor = (piece, e) => {
15106e82 880 const centerShift = this.getPieceWidth(r.width) / 2;
41534b92 881 const offset = getOffset(e);
9db5050a
BA
882 piece.style.left = (offset.x - centerShift) + "px";
883 piece.style.top = (offset.y - centerShift) + "px";
41534b92
BA
884 }
885
886 let start = null,
887 r = null,
888 startPiece, curPiece = null,
15106e82 889 pieceWidth;
41534b92 890 const mousedown = (e) => {
cb17fed8 891 // Disable zoom on smartphones:
b4ae3ff6
BA
892 if (e.touches && e.touches.length > 1)
893 e.preventDefault();
3c61449b 894 r = chessboard.getBoundingClientRect();
15106e82
BA
895 pieceWidth = this.getPieceWidth(r.width);
896 const cd = this.idToCoords(e.target.id);
897 if (cd) {
898 const move = this.doClick(cd);
b4ae3ff6 899 if (move)
e7d409fc 900 this.buildMoveStack(move, r);
6b9320bb 901 else if (!this.clickOnly) {
15106e82
BA
902 const [x, y] = Object.values(cd);
903 if (typeof x != "number")
904 startPiece = this.r_pieces[x][y];
905 else
906 startPiece = this.g_pieces[x][y];
907 if (startPiece && this.canIplay(x, y)) {
41534b92 908 e.preventDefault();
15106e82 909 start = cd;
41534b92
BA
910 curPiece = startPiece.cloneNode();
911 curPiece.style.transform = "none";
912 curPiece.style.zIndex = 5;
15106e82
BA
913 curPiece.style.width = pieceWidth + "px";
914 curPiece.style.height = pieceWidth + "px";
41534b92 915 centerOnCursor(curPiece, e);
9db5050a 916 container.appendChild(curPiece);
41534b92 917 startPiece.style.opacity = "0.4";
3c61449b 918 chessboard.style.cursor = "none";
41534b92
BA
919 }
920 }
921 }
922 };
923
924 const mousemove = (e) => {
925 if (start) {
926 e.preventDefault();
927 centerOnCursor(curPiece, e);
928 }
11625344
BA
929 else if (e.changedTouches && e.changedTouches.length >= 1)
930 // Attempt to prevent horizontal swipe...
931 e.preventDefault();
41534b92
BA
932 };
933
934 const mouseup = (e) => {
b4ae3ff6
BA
935 if (!start)
936 return;
41534b92
BA
937 const [x, y] = [start.x, start.y];
938 start = null;
939 e.preventDefault();
3c61449b 940 chessboard.style.cursor = "pointer";
41534b92
BA
941 startPiece.style.opacity = "1";
942 const offset = getOffset(e);
943 const landingElt = document.elementFromPoint(offset.x, offset.y);
15106e82
BA
944 const cd =
945 (landingElt ? this.idToCoords(landingElt.id) : undefined);
946 if (cd) {
41534b92
BA
947 // NOTE: clearly suboptimal, but much easier, and not a big deal.
948 const potentialMoves = this.getPotentialMovesFrom([x, y])
15106e82 949 .filter(m => m.end.x == cd.x && m.end.y == cd.y);
41534b92 950 const moves = this.filterValid(potentialMoves);
b4ae3ff6
BA
951 if (moves.length >= 2)
952 this.showChoices(moves, r);
953 else if (moves.length == 1)
e7d409fc 954 this.buildMoveStack(moves[0], r);
41534b92
BA
955 }
956 curPiece.remove();
957 };
958
a5da6269
BA
959 const resize = (e) => this.rescale(e.deltaY < 0 ? "up" : "down");
960
41534b92 961 if ('onmousedown' in window) {
a5da6269
BA
962 this.mouseListeners = [
963 {type: "mousedown", listener: mousedown},
964 {type: "mousemove", listener: mousemove},
965 {type: "mouseup", listener: mouseup},
966 {type: "wheel", listener: resize}
967 ];
968 this.mouseListeners.forEach(ml => {
969 document.addEventListener(ml.type, ml.listener);
970 });
41534b92
BA
971 }
972 if ('ontouchstart' in window) {
a5da6269
BA
973 this.touchListeners = [
974 {type: "touchstart", listener: mousedown},
975 {type: "touchmove", listener: mousemove},
976 {type: "touchend", listener: mouseup}
977 ];
978 this.touchListeners.forEach(tl => {
979 // https://stackoverflow.com/a/42509310/12660887
980 document.addEventListener(tl.type, tl.listener, {passive: false});
981 });
41534b92 982 }
11625344 983 // TODO: onpointerdown/move/up ? See reveal.js /controllers/touch.js
41534b92
BA
984 }
985
7c038235 986 // NOTE: not called if isDiagram
a5da6269 987 removeListeners() {
549ca151
BA
988 let container = document.getElementById(this.containerId);
989 this.windowResizeObs.unobserve(container);
a5da6269
BA
990 if ('onmousedown' in window) {
991 this.mouseListeners.forEach(ml => {
992 document.removeEventListener(ml.type, ml.listener);
993 });
994 }
995 if ('ontouchstart' in window) {
996 this.touchListeners.forEach(tl => {
997 // https://stackoverflow.com/a/42509310/12660887
998 document.removeEventListener(tl.type, tl.listener);
999 });
1000 }
1001 }
1002
41534b92
BA
1003 showChoices(moves, r) {
1004 let container = document.getElementById(this.containerId);
3c61449b 1005 let chessboard = container.querySelector(".chessboard");
41534b92
BA
1006 let choices = document.createElement("div");
1007 choices.id = "choices";
a2bb7e06
BA
1008 if (!r)
1009 r = chessboard.getBoundingClientRect();
41534b92
BA
1010 choices.style.width = r.width + "px";
1011 choices.style.height = r.height + "px";
1012 choices.style.left = r.x + "px";
1013 choices.style.top = r.y + "px";
3c61449b
BA
1014 chessboard.style.opacity = "0.5";
1015 container.appendChild(choices);
15106e82 1016 const squareWidth = r.width / this.size.y;
41534b92
BA
1017 const firstUpLeft = (r.width - (moves.length * squareWidth)) / 2;
1018 const firstUpTop = (r.height - squareWidth) / 2;
1019 const color = moves[0].appear[0].c;
1020 const callback = (m) => {
3c61449b
BA
1021 chessboard.style.opacity = "1";
1022 container.removeChild(choices);
e7d409fc 1023 this.buildMoveStack(m, r);
41534b92
BA
1024 }
1025 for (let i=0; i < moves.length; i++) {
1026 let choice = document.createElement("div");
1027 choice.classList.add("choice");
1028 choice.style.width = squareWidth + "px";
1029 choice.style.height = squareWidth + "px";
1030 choice.style.left = (firstUpLeft + i * squareWidth) + "px";
1031 choice.style.top = firstUpTop + "px";
1032 choice.style.backgroundColor = "lightyellow";
1033 choice.onclick = () => callback(moves[i]);
1034 const piece = document.createElement("piece");
3b641716 1035 const cdisp = moves[i].choice || moves[i].appear[0].p;
2159c239
BA
1036 C.AddClass_es(piece,
1037 this.pieces(color, moves[i].end.x, moves[i].end.y)[cdisp]["class"]);
616a8d7a 1038 piece.classList.add(V.GetColorClass(color));
41534b92
BA
1039 piece.style.width = "100%";
1040 piece.style.height = "100%";
1041 choice.appendChild(piece);
1042 choices.appendChild(choice);
1043 }
1044 }
1045
98d14451
BA
1046 displayMessage(elt, msg, classe_s, timeout) {
1047 if (elt)
1048 // Fixed element, e.g. for Dice Chess
1049 elt.innerHTML = msg;
1050 else {
1051 // Temporary div (Chakart, Apocalypse...)
1052 let divMsg = document.createElement("div");
1053 C.AddClass_es(divMsg, classe_s);
1054 divMsg.innerHTML = msg;
1055 let container = document.getElementById(this.containerId);
1056 container.appendChild(divMsg);
1057 setTimeout(() => container.removeChild(divMsg), timeout);
1058 }
1059 }
1060
ca8a3993
BA
1061 ////////////////
1062 // DARK METHODS
1063
1064 updateEnlightened() {
1065 this.oldEnlightened = this.enlightened;
1066 this.enlightened = ArrayFun.init(this.size.x, this.size.y, false);
1067 // Add pieces positions + all squares reachable by moves (includes Zen):
1068 for (let x=0; x<this.size.x; x++) {
1069 for (let y=0; y<this.size.y; y++) {
1070 if (this.board[x][y] != "" && this.getColor(x, y) == this.playerColor)
1071 {
1072 this.enlightened[x][y] = true;
1073 this.getPotentialMovesFrom([x, y]).forEach(m => {
1074 this.enlightened[m.end.x][m.end.y] = true;
1075 });
1076 }
1077 }
1078 }
1079 if (this.epSquare)
1080 this.enlightEnpassant();
1081 }
1082
1083 // Include square of the en-passant capturing square:
1084 enlightEnpassant() {
1085 // NOTE: shortcut, pawn has only one attack type, doesn't depend on square
ceeac4e8
BA
1086 // TODO: (0, 0) is wrong, would need to place an attacker here...
1087 const steps = this.pieces(this.playerColor, 0, 0)["p"].attack[0].steps;
ca8a3993 1088 for (let step of steps) {
65203419 1089 const x = this.epSquare.x - step[0], //NOTE: epSquare.x not on edge
ca8a3993
BA
1090 y = this.getY(this.epSquare.y - step[1]);
1091 if (
1092 this.onBoard(x, y) &&
1093 this.getColor(x, y) == this.playerColor &&
1094 this.getPieceType(x, y) == "p"
1095 ) {
1096 this.enlightened[x][this.epSquare.y] = true;
1097 break;
1098 }
1099 }
1100 }
1101
1102 // Apply diff this.enlightened --> oldEnlightened on board
1103 graphUpdateEnlightened() {
1104 let chessboard =
1105 document.getElementById(this.containerId).querySelector(".chessboard");
1106 const r = chessboard.getBoundingClientRect();
1107 const pieceWidth = this.getPieceWidth(r.width);
1108 for (let x=0; x<this.size.x; x++) {
1109 for (let y=0; y<this.size.y; y++) {
1110 if (!this.enlightened[x][y] && this.oldEnlightened[x][y]) {
1111 let elt = document.getElementById(this.coordsToId({x: x, y: y}));
1112 elt.classList.add("in-shadow");
1113 if (this.g_pieces[x][y])
1114 this.g_pieces[x][y].classList.add("hidden");
1115 }
1116 else if (this.enlightened[x][y] && !this.oldEnlightened[x][y]) {
1117 let elt = document.getElementById(this.coordsToId({x: x, y: y}));
1118 elt.classList.remove("in-shadow");
1119 if (this.g_pieces[x][y])
1120 this.g_pieces[x][y].classList.remove("hidden");
1121 }
1122 }
1123 }
1124 }
1125
41534b92
BA
1126 //////////////
1127 // BASIC UTILS
1128
1129 get size() {
15106e82
BA
1130 return {
1131 x: 8,
1132 y: 8,
f55a0a67 1133 ratio: 1 //for rectangular board = y / x (optional, 1 = default)
15106e82 1134 };
41534b92
BA
1135 }
1136
ca8a3993 1137 // Color of thing on square (i,j). '' if square is empty
41534b92 1138 getColor(i, j) {
15106e82
BA
1139 if (typeof i == "string")
1140 return i; //reserves
41534b92
BA
1141 return this.board[i][j].charAt(0);
1142 }
1143
15106e82 1144 static GetColorClass(c) {
bc2bc396
BA
1145 if (c == 'w')
1146 return "white";
1147 if (c == 'b')
1148 return "black";
24872b22 1149 return "other-color"; //unidentified color
15106e82
BA
1150 }
1151
ca8a3993 1152 // Piece on i,j. '' if square is empty
41534b92 1153 getPiece(i, j) {
15106e82
BA
1154 if (typeof j == "string")
1155 return j; //reserves
41534b92
BA
1156 return this.board[i][j].charAt(1);
1157 }
1158
cc2c7183 1159 // Piece type on square (i,j)
6b9320bb 1160 getPieceType(x, y, p) {
65cf1690 1161 if (!p)
6b9320bb 1162 p = this.getPiece(x, y);
ceeac4e8 1163 return this.pieces(this.getColor(x, y), x, y)[p].moveas || p;
6b9320bb
BA
1164 }
1165
1166 isKing(x, y, p) {
1167 if (!p)
1168 p = this.getPiece(x, y);
1169 if (!this.options["cannibal"])
1170 return p == 'k';
1171 return !!C.CannibalKings[p];
cc2c7183
BA
1172 }
1173
ceeac4e8
BA
1174 static GetOppTurn(color) {
1175 return (color == 'w' ? 'b' : 'w');
1176 }
1177
1178 // Get opponent color(s): may differ from turn (e.g. Checkered)
1179 getOppCols(color) {
41534b92
BA
1180 return (color == "w" ? "b" : "w");
1181 }
1182
41534b92
BA
1183 // Is (x,y) on the chessboard?
1184 onBoard(x, y) {
b99ce1fb
BA
1185 return (x >= 0 && x < this.size.x &&
1186 y >= 0 && y < this.size.y);
41534b92
BA
1187 }
1188
15106e82 1189 // Am I allowed to move thing at square x,y ?
41534b92 1190 canIplay(x, y) {
0c44c676 1191 return (this.playerColor == this.turn && this.getColor(x, y) == this.turn);
41534b92
BA
1192 }
1193
1194 ////////////////////////
1195 // PIECES SPECIFICATIONS
1196
5006aaca
BA
1197 getPawnShift(color) {
1198 return (color == "w" ? -1 : 1);
1199 }
65203419
BA
1200 isPawnInitRank(x, color) {
1201 return (color == 'w' && x >= 6) || (color == 'b' && x <= 1);
1202 }
5006aaca 1203
c9ab0340 1204 pieces(color, x, y) {
b8950be5 1205 const pawnShift = this.getPawnShift(color || 'w');
41534b92
BA
1206 return {
1207 'p': {
1208 "class": "pawn",
c9ab0340
BA
1209 moves: [
1210 {
1211 steps: [[pawnShift, 0]],
65203419 1212 range: (this.isPawnInitRank(x, color) ? 2 : 1)
c9ab0340
BA
1213 }
1214 ],
1215 attack: [
1216 {
1217 steps: [[pawnShift, 1], [pawnShift, -1]],
1218 range: 1
1219 }
1220 ]
41534b92 1221 },
41534b92
BA
1222 'r': {
1223 "class": "rook",
33b42748 1224 both: [
c9ab0340
BA
1225 {steps: [[0, 1], [0, -1], [1, 0], [-1, 0]]}
1226 ]
41534b92 1227 },
41534b92
BA
1228 'n': {
1229 "class": "knight",
33b42748 1230 both: [
c9ab0340
BA
1231 {
1232 steps: [
1233 [1, 2], [1, -2], [-1, 2], [-1, -2],
1234 [2, 1], [-2, 1], [2, -1], [-2, -1]
1235 ],
1236 range: 1
1237 }
1238 ]
41534b92 1239 },
41534b92
BA
1240 'b': {
1241 "class": "bishop",
33b42748 1242 both: [
c9ab0340
BA
1243 {steps: [[1, 1], [1, -1], [-1, 1], [-1, -1]]}
1244 ]
41534b92 1245 },
41534b92
BA
1246 'q': {
1247 "class": "queen",
33b42748 1248 both: [
c9ab0340
BA
1249 {
1250 steps: [
1251 [0, 1], [0, -1], [1, 0], [-1, 0],
1252 [1, 1], [1, -1], [-1, 1], [-1, -1]
1253 ]
1254 }
41534b92
BA
1255 ]
1256 },
41534b92
BA
1257 'k': {
1258 "class": "king",
33b42748 1259 both: [
c9ab0340
BA
1260 {
1261 steps: [
1262 [0, 1], [0, -1], [1, 0], [-1, 0],
1263 [1, 1], [1, -1], [-1, 1], [-1, -1]
1264 ],
1265 range: 1
1266 }
1267 ]
cc2c7183
BA
1268 },
1269 // Cannibal kings:
c9ab0340
BA
1270 '!': {"class": "king-pawn", moveas: "p"},
1271 '#': {"class": "king-rook", moveas: "r"},
1272 '$': {"class": "king-knight", moveas: "n"},
1273 '%': {"class": "king-bishop", moveas: "b"},
1274 '*': {"class": "king-queen", moveas: "q"}
41534b92
BA
1275 };
1276 }
1277
af9c9be3
BA
1278 // NOTE: using special symbols to not interfere with variants' pieces codes
1279 static get CannibalKings() {
1280 return {
1281 "!": "p",
1282 "#": "r",
1283 "$": "n",
1284 "%": "b",
1285 "*": "q",
1286 "k": "k"
1287 };
1288 }
1289
1290 static get CannibalKingCode() {
1291 return {
1292 "p": "!",
1293 "r": "#",
1294 "n": "$",
1295 "b": "%",
1296 "q": "*",
1297 "k": "k"
1298 };
1299 }
1300
1301 //////////////////////////
1302 // MOVES GENERATION UTILS
41534b92 1303
adf7c659
BA
1304 // For Cylinder: get Y coordinate
1305 getY(y) {
b4ae3ff6
BA
1306 if (!this.options["cylinder"])
1307 return y;
41534b92 1308 let res = y % this.size.y;
b4ae3ff6 1309 if (res < 0)
adf7c659 1310 res += this.size.y;
41534b92
BA
1311 return res;
1312 }
65203419
BA
1313 // Circular?
1314 getX(x) {
1315 return x; //generally, no
1316 }
1317
1318 increment([x, y], step) {
1319 return [
1320 this.getX(x + step[0]),
1321 this.getY(y + step[1])
1322 ];
1323 }
41534b92 1324
ca8a3993
BA
1325 getSegments(curSeg, segStart, segEnd) {
1326 if (curSeg.length == 0)
1327 return undefined;
1328 let segments = JSON.parse(JSON.stringify(curSeg)); //not altering
1329 segments.push([[segStart[0], segStart[1]], [segEnd[0], segEnd[1]]]);
1330 return segments;
1331 }
1332
6b9320bb 1333 getStepSpec(color, x, y, piece) {
0e466aac 1334 let pieceType = piece;
33b42748 1335 let allSpecs = this.pieces(color, x, y);
0e466aac
BA
1336 if (!piece)
1337 pieceType = this.getPieceType(x, y);
1338 else if (allSpecs[piece].moveas)
1339 pieceType = allSpecs[piece].moveas;
33b42748
BA
1340 let res = allSpecs[pieceType];
1341 if (!res["both"])
1342 res.both = [];
1343 if (!res["moves"])
1344 res.moves = [];
1345 if (!res["attack"])
1346 res.attack = [];
1347 return res;
ca8a3993
BA
1348 }
1349
af9c9be3
BA
1350 // Can thing on square1 capture thing on square2?
1351 canTake([x1, y1], [x2, y2]) {
1352 return this.getColor(x1, y1) !== this.getColor(x2, y2);
1353 }
1354
de1421be 1355 // Teleport & Recycle. Assumption: color(x1,y1) == color(x2,y2)
727f2e55 1356 canSelfTake([x1, y1], [x2, y2]) {
de1421be 1357 return !this.isKing(x2, y2);
727f2e55
BA
1358 }
1359
af9c9be3
BA
1360 canStepOver(i, j, p) {
1361 // In some variants, objects on boards don't stop movement (Chakart)
1362 return this.board[i][j] == "";
1363 }
1364
ca8a3993
BA
1365 canDrop([c, p], [i, j]) {
1366 return (
1367 this.board[i][j] == "" &&
1368 (!this.enlightened || this.enlightened[i][j]) &&
1369 (
1370 p != "p" ||
1371 (c == 'w' && i < this.size.x - 1) ||
1372 (c == 'b' && i > 0)
1373 )
1374 );
1375 }
1376
af9c9be3
BA
1377 // For Madrasi:
1378 // (redefined in Baroque etc, where Madrasi condition doesn't make sense)
1379 isImmobilized([x, y]) {
1380 if (!this.options["madrasi"])
1381 return false;
1382 const color = this.getColor(x, y);
ceeac4e8 1383 const oppCols = this.getOppCols(color);
6b9320bb
BA
1384 const piece = this.getPieceType(x, y);
1385 const stepSpec = this.getStepSpec(color, x, y, piece);
33b42748 1386 const attacks = stepSpec.both.concat(stepSpec.attack);
af9c9be3
BA
1387 for (let a of attacks) {
1388 outerLoop: for (let step of a.steps) {
65203419
BA
1389 let [i, j] = this.increment([x, y], step);
1390 let stepCounter = 0;
af9c9be3
BA
1391 while (this.onBoard(i, j) && this.board[i][j] == "") {
1392 if (a.range <= stepCounter++)
1393 continue outerLoop;
65203419 1394 [i, j] = this.increment([i, j], step);
af9c9be3
BA
1395 }
1396 if (
1397 this.onBoard(i, j) &&
ceeac4e8 1398 oppCols.includes(this.getColor(i, j)) &&
af9c9be3
BA
1399 this.getPieceType(i, j) == piece
1400 ) {
1401 return true;
1402 }
1403 }
1404 }
1405 return false;
1406 }
1407
41534b92
BA
1408 // Stop at the first capture found
1409 atLeastOneCapture(color) {
6b9320bb
BA
1410 const allowed = (sq1, sq2) => {
1411 return (
1412 // NOTE: canTake is reversed for Zen.
1413 // Generally ok because of the symmetry. TODO?
1414 this.canTake(sq1, sq2) &&
1415 this.filterValid(
1416 [this.getBasicMove(sq1, sq2)]).length >= 1
1417 );
af9c9be3
BA
1418 };
1419 for (let i=0; i<this.size.x; i++) {
1420 for (let j=0; j<this.size.y; j++) {
1421 if (this.getColor(i, j) == color) {
1422 if (
6b9320bb
BA
1423 (
1424 !this.options["zen"] &&
1425 this.findDestSquares(
1426 [i, j],
1427 {
1428 attackOnly: true,
1429 one: true,
6b9320bb
BA
1430 },
1431 allowed
1432 )
1433 )
1434 ||
1435 (
1436 (
1437 this.options["zen"] &&
1438 this.findCapturesOn(
1439 [i, j],
714ce6d8 1440 {one: true},
6b9320bb
BA
1441 allowed
1442 )
1443 )
1444 )
af9c9be3
BA
1445 ) {
1446 return true;
41534b92
BA
1447 }
1448 }
1449 }
1450 }
1451 return false;
1452 }
1453
af9c9be3 1454 compatibleStep([x1, y1], [x2, y2], step, range) {
6b9320bb 1455 const epsilon = 1e-7; //arbitrary small value
af9c9be3
BA
1456 let shifts = [0];
1457 if (this.options["cylinder"])
1458 Array.prototype.push.apply(shifts, [-this.size.y, this.size.y]);
1459 for (let sh of shifts) {
1460 const rx = (x2 - x1) / step[0],
1461 ry = (y2 + sh - y1) / step[1];
1462 if (
6b9320bb 1463 // Zero step but non-zero interval => impossible
af9c9be3 1464 (!Number.isFinite(rx) && !Number.isNaN(rx)) ||
6b9320bb
BA
1465 (!Number.isFinite(ry) && !Number.isNaN(ry)) ||
1466 // Negative number of step (impossible)
1467 (rx < 0 || ry < 0) ||
1468 // Not the same number of steps in both directions:
1469 (!Number.isNaN(rx) && !Number.isNaN(ry) && Math.abs(rx - ry) > epsilon)
af9c9be3
BA
1470 ) {
1471 continue;
1472 }
1473 let distance = (Number.isNaN(rx) ? ry : rx);
6b9320bb 1474 if (Math.abs(distance - Math.round(distance)) > epsilon)
af9c9be3
BA
1475 continue;
1476 distance = Math.round(distance); //in case of (numerical...)
6b9320bb 1477 if (!range || range >= distance)
af9c9be3
BA
1478 return true;
1479 }
1480 return false;
1481 }
1482
1483 ////////////////////
1484 // MOVES GENERATION
1485
41534b92
BA
1486 getDropMovesFrom([c, p]) {
1487 // NOTE: by design, this.reserve[c][p] >= 1 on user click
1a7c0492 1488 // (but not necessarily otherwise: atLeastOneMove() etc)
b4ae3ff6
BA
1489 if (this.reserve[c][p] == 0)
1490 return [];
41534b92
BA
1491 let moves = [];
1492 for (let i=0; i<this.size.x; i++) {
1493 for (let j=0; j<this.size.y; j++) {
9b760538 1494 if (this.onBoard(i, j) && this.canDrop([c, p], [i, j])) {
ca8a3993
BA
1495 let mv = new Move({
1496 start: {x: c, y: p},
1497 end: {x: i, y: j},
1498 appear: [new PiPo({x: i, y: j, c: c, p: p})],
1499 vanish: []
1500 });
1501 if (this.board[i][j] != "") {
1502 mv.vanish.push(new PiPo({
1503 x: i,
1504 y: j,
1505 c: this.getColor(i, j),
1506 p: this.getPiece(i, j)
1507 }));
1508 }
1509 moves.push(mv);
41534b92
BA
1510 }
1511 }
1512 }
1513 return moves;
1514 }
1515
1516 // All possible moves from selected square
de1421be 1517 // TODO: generalize usage if arg "color" (e.g. Checkered)
ca8a3993 1518 getPotentialMovesFrom([x, y], color) {
8b301184
BA
1519 if (this.subTurnTeleport == 2)
1520 return [];
ca8a3993
BA
1521 if (typeof x == "string")
1522 return this.getDropMovesFrom([x, y]);
1523 if (this.isImmobilized([x, y]))
b4ae3ff6 1524 return [];
ca8a3993
BA
1525 const piece = this.getPieceType(x, y);
1526 let moves = this.getPotentialMovesOf(piece, [x, y]);
1527 if (piece == "p" && this.hasEnpassant && this.epSquare)
1528 Array.prototype.push.apply(moves, this.getEnpassantCaptures([x, y]));
dcfaab5d 1529 if (this.isKing(0, 0, piece) && this.hasCastle)
ca8a3993 1530 Array.prototype.push.apply(moves, this.getCastleMoves([x, y]));
41534b92
BA
1531 return this.postProcessPotentialMoves(moves);
1532 }
1533
1534 postProcessPotentialMoves(moves) {
b4ae3ff6
BA
1535 if (moves.length == 0)
1536 return [];
41534b92 1537 const color = this.getColor(moves[0].start.x, moves[0].start.y);
ceeac4e8 1538 const oppCols = this.getOppCols(color);
41534b92 1539
6b9320bb 1540 if (this.options["capture"] && this.atLeastOneCapture(color))
ceeac4e8 1541 moves = this.capturePostProcess(moves, oppCols);
41534b92 1542
57b8015b 1543 if (this.options["atomic"])
ceeac4e8 1544 moves = this.atomicPostProcess(moves, color, oppCols);
cc2c7183 1545
c9ab0340
BA
1546 if (
1547 moves.length > 0 &&
1548 this.getPieceType(moves[0].start.x, moves[0].start.y) == "p"
1549 ) {
ceeac4e8 1550 moves = this.pawnPostProcess(moves, color, oppCols);
c9ab0340
BA
1551 }
1552
6b9320bb 1553 if (this.options["cannibal"] && this.options["rifle"])
cc2c7183 1554 // In this case a rifle-capture from last rank may promote a pawn
98d14451 1555 moves = this.riflePromotePostProcess(moves, color);
57b8015b
BA
1556
1557 return moves;
1558 }
1559
ceeac4e8 1560 capturePostProcess(moves, oppCols) {
57b8015b
BA
1561 // Filter out non-capturing moves (not using m.vanish because of
1562 // self captures of Recycle and Teleport).
1563 return moves.filter(m => {
1564 return (
1565 this.board[m.end.x][m.end.y] != "" &&
ceeac4e8 1566 oppCols.includes(this.getColor(m.end.x, m.end.y))
57b8015b
BA
1567 );
1568 });
1569 }
1570
ceeac4e8 1571 atomicPostProcess(moves, color, oppCols) {
57b8015b
BA
1572 moves.forEach(m => {
1573 if (
1574 this.board[m.end.x][m.end.y] != "" &&
ceeac4e8 1575 oppCols.includes(this.getColor(m.end.x, m.end.y))
57b8015b
BA
1576 ) {
1577 // Explosion!
1578 let steps = [
1579 [-1, -1],
1580 [-1, 0],
1581 [-1, 1],
1582 [0, -1],
1583 [0, 1],
1584 [1, -1],
1585 [1, 0],
1586 [1, 1]
1587 ];
e7d409fc
BA
1588 let mNext = new Move({
1589 start: m.end,
1590 end: m.end,
1591 appear: [],
1592 vanish: []
1593 });
57b8015b 1594 for (let step of steps) {
65203419 1595 let [x, y] = this.increment([m.end.x, m.end.y], step);
57b8015b
BA
1596 if (
1597 this.onBoard(x, y) &&
1598 this.board[x][y] != "" &&
e7d409fc 1599 (x != m.start.x || y != m.start.y) &&
57b8015b
BA
1600 this.getPieceType(x, y) != "p"
1601 ) {
e7d409fc 1602 mNext.vanish.push(
57b8015b
BA
1603 new PiPo({
1604 p: this.getPiece(x, y),
1605 c: this.getColor(x, y),
1606 x: x,
1607 y: y
1608 })
1609 );
1610 }
1611 }
e7d409fc
BA
1612 if (!this.options["rifle"]) {
1613 // The moving piece also vanish
1614 mNext.vanish.unshift(
1615 new PiPo({
1616 x: m.end.x,
1617 y: m.end.y,
1618 c: color,
1619 p: this.getPiece(m.start.x, m.start.y)
1620 })
1621 );
1622 }
1623 m.next = mNext;
57b8015b
BA
1624 }
1625 });
98d14451 1626 return moves;
57b8015b
BA
1627 }
1628
ceeac4e8 1629 pawnPostProcess(moves, color, oppCols) {
57b8015b
BA
1630 let moreMoves = [];
1631 const lastRank = (color == "w" ? 0 : this.size.x - 1);
1632 const initPiece = this.getPiece(moves[0].start.x, moves[0].start.y);
1633 moves.forEach(m => {
57b8015b
BA
1634 const [x1, y1] = [m.start.x, m.start.y];
1635 const [x2, y2] = [m.end.x, m.end.y];
1636 const promotionOk = (
1637 x2 == lastRank &&
1638 (!this.options["rifle"] || this.board[x2][y2] == "")
1639 );
1640 if (!promotionOk)
1641 return; //nothing to do
8cc2f6d0
BA
1642 if (this.options["pawnfall"]) {
1643 m.appear.shift();
8cc2f6d0
BA
1644 return;
1645 }
9ac67217 1646 let finalPieces;
99ea2453
BA
1647 if (
1648 this.options["cannibal"] &&
1649 this.board[x2][y2] != "" &&
ceeac4e8 1650 oppCols.includes(this.getColor(x2, y2))
99ea2453
BA
1651 ) {
1652 finalPieces = [this.getPieceType(x2, y2)];
1653 }
1654 else
1655 finalPieces = this.pawnPromotions;
57b8015b
BA
1656 m.appear[0].p = finalPieces[0];
1657 if (initPiece == "!") //cannibal king-pawn
1658 m.appear[0].p = C.CannibalKingCode[finalPieces[0]];
1659 for (let i=1; i<finalPieces.length; i++) {
9ac67217 1660 let newMove = JSON.parse(JSON.stringify(m));
57b8015b 1661 const piece = finalPieces[i];
9ac67217 1662 m.appear[0].p = (initPiece != "!" ? piece : C.CannibalKingCode[piece]);
57b8015b
BA
1663 moreMoves.push(newMove);
1664 }
1665 });
98d14451 1666 return moves.concat(moreMoves);
57b8015b 1667 }
cc2c7183 1668
9db5050a 1669 riflePromotePostProcess(moves, color) {
57b8015b
BA
1670 const lastRank = (color == "w" ? 0 : this.size.x - 1);
1671 let newMoves = [];
1672 moves.forEach(m => {
1673 if (
1674 m.start.x == lastRank &&
1675 m.appear.length >= 1 &&
1676 m.appear[0].p == "p" &&
1677 m.appear[0].x == m.start.x &&
1678 m.appear[0].y == m.start.y
1679 ) {
57b8015b
BA
1680 m.appear[0].p = this.pawnPromotions[0];
1681 for (let i=1; i<this.pawnPromotions.length; i++) {
1682 let newMv = JSON.parse(JSON.stringify(m));
65203419 1683 newMv.appear[0].p = this.pawnPromotions[i];
57b8015b
BA
1684 newMoves.push(newMv);
1685 }
1686 }
1687 });
98d14451 1688 return moves.concat(newMoves);
41534b92
BA
1689 }
1690
af9c9be3 1691 // Generic method to find possible moves of "sliding or jumping" pieces
6b9320bb 1692 getPotentialMovesOf(piece, [x, y]) {
41534b92 1693 const color = this.getColor(x, y);
6b9320bb 1694 const stepSpec = this.getStepSpec(color, x, y, piece);
af9c9be3 1695 let squares = [];
6b9320bb 1696 if (stepSpec.attack) {
af9c9be3
BA
1697 squares = this.findDestSquares(
1698 [x, y],
1699 {
1700 attackOnly: true,
6b9320bb 1701 stepSpec: stepSpec
af9c9be3 1702 },
6b9320bb 1703 ([i1, j1], [i2, j2]) => {
af9c9be3 1704 return (
6b9320bb
BA
1705 (!this.options["zen"] || this.isKing(i2, j2)) &&
1706 this.canTake([i1, j1], [i2, j2])
af9c9be3 1707 );
c9ab0340 1708 }
af9c9be3
BA
1709 );
1710 }
1711 const noSpecials = this.findDestSquares(
1712 [x, y],
1713 {
6b9320bb 1714 moveOnly: !!stepSpec.attack || this.options["zen"],
6b9320bb
BA
1715 stepSpec: stepSpec
1716 }
af9c9be3
BA
1717 );
1718 Array.prototype.push.apply(squares, noSpecials);
1719 if (this.options["zen"]) {
1720 let zenCaptures = this.findCapturesOn(
1721 [x, y],
6b9320bb
BA
1722 {}, //byCol: default is ok
1723 ([i1, j1], [i2, j2]) =>
1724 !this.isKing(i1, j1) && this.canTake([i2, j2], [i1, j1])
af9c9be3
BA
1725 );
1726 // Technical step: segments (if any) are reversed
714ce6d8
BA
1727 zenCaptures.forEach(z => {
1728 if (!!z.segments)
ca8a3993 1729 z.segments = z.segments.reverse().map(s => s.reverse())
714ce6d8 1730 });
af9c9be3 1731 Array.prototype.push.apply(squares, zenCaptures);
41534b92 1732 }
b98feb3f 1733 if (this.hasSelfCaptures) {
af9c9be3
BA
1734 const selfCaptures = this.findDestSquares(
1735 [x, y],
1736 {
1737 attackOnly: true,
6b9320bb 1738 stepSpec: stepSpec
af9c9be3 1739 },
de1421be
BA
1740 ([i1, j1], [i2, j2]) => {
1741 return (
1742 this.getColor(i2, j2) == color &&
1743 this.canSelfTake([i1, j1], [i2, j2])
1744 );
1745 }
af9c9be3
BA
1746 );
1747 Array.prototype.push.apply(squares, selfCaptures);
1748 }
1749 return squares.map(s => {
1750 let mv = this.getBasicMove([x, y], s.sq);
714ce6d8 1751 if (!!s.segments)
af9c9be3
BA
1752 mv.segments = s.segments;
1753 return mv;
1754 });
3b641716
BA
1755 }
1756
af9c9be3
BA
1757 findDestSquares([x, y], o, allowed) {
1758 if (!allowed)
6b9320bb 1759 allowed = (sq1, sq2) => this.canTake(sq1, sq2);
65cf1690 1760 const apparentPiece = this.getPiece(x, y); //how it looks
af9c9be3 1761 let res = [];
714ce6d8 1762 // Next 3 for Cylinder mode or circular (useless otherwise)
adf7c659
BA
1763 let explored = {};
1764 let segments = [];
1765 let segStart = [];
af9c9be3
BA
1766 const addSquare = ([i, j]) => {
1767 let elt = {sq: [i, j]};
714ce6d8 1768 if (segments.length >= 1)
727f2e55 1769 elt.segments = this.getSegments(segments, segStart, [i, j]);
af9c9be3 1770 res.push(elt);
adf7c659 1771 };
33b42748 1772 const exploreSteps = (stepArray, mode) => {
c9ab0340
BA
1773 for (let s of stepArray) {
1774 outerLoop: for (let step of s.steps) {
714ce6d8
BA
1775 segments = [];
1776 segStart = [x, y];
d262cff4
BA
1777 let [i, j] = [x, y];
1778 let stepCounter = 0;
1779 while (
1780 this.onBoard(i, j) &&
65cf1690 1781 ((i == x && j == y) || this.canStepOver(i, j, apparentPiece))
d262cff4 1782 ) {
6b9320bb 1783 if (!explored[i + "." + j] && (i != x || j != y)) {
c9ab0340 1784 explored[i + "." + j] = true;
af9c9be3 1785 if (
6b9320bb
BA
1786 !o.captureTarget ||
1787 (o.captureTarget[0] == i && o.captureTarget[1] == j)
af9c9be3 1788 ) {
33b42748 1789 if (o.one && mode != "attack")
af9c9be3 1790 return true;
33b42748 1791 if (mode != "attack")
af9c9be3
BA
1792 addSquare(!o.captureTarget ? [i, j] : [x, y]);
1793 if (o.captureTarget)
1794 return res[0];
1795 }
c9ab0340
BA
1796 }
1797 if (s.range <= stepCounter++)
1798 continue outerLoop;
d262cff4 1799 const oldIJ = [i, j];
65203419 1800 [i, j] = this.increment([i, j], step);
c08a5e74
BA
1801 if (
1802 Math.abs(i - oldIJ[0]) != Math.abs(step[0]) ||
1803 Math.abs(j - oldIJ[1]) != Math.abs(step[1])
1804 ) {
714ce6d8 1805 // Boundary between segments (cylinder or circular mode)
adf7c659
BA
1806 segments.push([[segStart[0], segStart[1]], oldIJ]);
1807 segStart = [i, j];
d262cff4 1808 }
c9ab0340
BA
1809 }
1810 if (!this.onBoard(i, j))
1811 continue;
1812 const pieceIJ = this.getPieceType(i, j);
af9c9be3 1813 if (!explored[i + "." + j]) {
c9ab0340 1814 explored[i + "." + j] = true;
6b9320bb 1815 if (allowed([x, y], [i, j])) {
33b42748 1816 if (o.one && mode != "moves")
af9c9be3 1817 return true;
33b42748 1818 if (mode != "moves")
af9c9be3
BA
1819 addSquare(!o.captureTarget ? [i, j] : [x, y]);
1820 if (
1821 o.captureTarget &&
1822 o.captureTarget[0] == i && o.captureTarget[1] == j
1823 ) {
1824 return res[0];
1825 }
1826 }
c9ab0340
BA
1827 }
1828 }
41534b92 1829 }
6b9320bb 1830 return undefined; //default, but let's explicit it
c9ab0340 1831 };
af9c9be3 1832 if (o.captureTarget)
33b42748 1833 return exploreSteps(o.captureSteps, "attack");
af9c9be3 1834 else {
6b9320bb
BA
1835 const stepSpec =
1836 o.stepSpec || this.getStepSpec(this.getColor(x, y), x, y);
1837 let outOne = false;
33b42748
BA
1838 if (!o.attackOnly)
1839 outOne = exploreSteps(stepSpec.both.concat(stepSpec.moves), "moves");
1840 if (!outOne && !o.moveOnly)
1841 outOne = exploreSteps(stepSpec.both.concat(stepSpec.attack), "attack");
6b9320bb 1842 return (o.one ? outOne : res);
082e639a 1843 }
41534b92
BA
1844 }
1845
082e639a 1846 // Search for enemy (or not) pieces attacking [x, y]
af9c9be3 1847 findCapturesOn([x, y], o, allowed) {
af9c9be3 1848 if (!o.byCol)
ceeac4e8 1849 o.byCol = this.getOppCols(this.getColor(x, y) || this.turn);
ca8a3993 1850 let res = [];
c9ab0340
BA
1851 for (let i=0; i<this.size.x; i++) {
1852 for (let j=0; j<this.size.y; j++) {
af9c9be3 1853 const colIJ = this.getColor(i, j);
57b8015b
BA
1854 if (
1855 this.board[i][j] != "" &&
af9c9be3 1856 o.byCol.includes(colIJ) &&
57b8015b
BA
1857 !this.isImmobilized([i, j])
1858 ) {
65cf1690
BA
1859 const apparentPiece = this.getPiece(i, j);
1860 // Quick check: does this potential attacker target x,y ?
1861 if (this.canStepOver(x, y, apparentPiece))
1862 continue;
af9c9be3 1863 const stepSpec = this.getStepSpec(colIJ, i, j);
33b42748 1864 const attacks = stepSpec.attack.concat(stepSpec.both);
c9ab0340
BA
1865 for (let a of attacks) {
1866 for (let s of a.steps) {
1867 // Quick check: if step isn't compatible, don't even try
af9c9be3 1868 if (!this.compatibleStep([i, j], [x, y], s, a.range))
c9ab0340
BA
1869 continue;
1870 // Finally verify that nothing stand in-between
6b9320bb 1871 const out = this.findDestSquares(
af9c9be3
BA
1872 [i, j],
1873 {
1874 captureTarget: [x, y],
1875 captureSteps: [{steps: [s], range: a.range}],
af9c9be3 1876 },
6b9320bb 1877 allowed
af9c9be3 1878 );
6b9320bb 1879 if (out) {
af9c9be3
BA
1880 if (o.one)
1881 return true;
6b9320bb 1882 res.push(out);
c9ab0340
BA
1883 }
1884 }
1885 }
41534b92 1886 }
c9ab0340
BA
1887 }
1888 }
6b9320bb 1889 return (o.one ? false : res);
57b8015b
BA
1890 }
1891
41534b92
BA
1892 // Build a regular move from its initial and destination squares.
1893 // tr: transformation
1894 getBasicMove([sx, sy], [ex, ey], tr) {
1895 const initColor = this.getColor(sx, sy);
cc2c7183 1896 const initPiece = this.getPiece(sx, sy);
41534b92
BA
1897 const destColor = (this.board[ex][ey] != "" ? this.getColor(ex, ey) : "");
1898 let mv = new Move({
1899 appear: [],
1900 vanish: [],
15106e82
BA
1901 start: {x: sx, y: sy},
1902 end: {x: ex, y: ey}
41534b92
BA
1903 });
1904 if (
1905 !this.options["rifle"] ||
1906 this.board[ex][ey] == "" ||
1907 destColor == initColor //Recycle, Teleport
1908 ) {
1909 mv.appear = [
1910 new PiPo({
1911 x: ex,
1912 y: ey,
1913 c: !!tr ? tr.c : initColor,
1914 p: !!tr ? tr.p : initPiece
1915 })
1916 ];
1917 mv.vanish = [
1918 new PiPo({
1919 x: sx,
1920 y: sy,
1921 c: initColor,
1922 p: initPiece
1923 })
1924 ];
1925 }
1926 if (this.board[ex][ey] != "") {
1927 mv.vanish.push(
1928 new PiPo({
1929 x: ex,
1930 y: ey,
1931 c: this.getColor(ex, ey),
cc2c7183 1932 p: this.getPiece(ex, ey)
41534b92
BA
1933 })
1934 );
41534b92 1935 if (this.options["cannibal"] && destColor != initColor) {
6b9320bb 1936 const lastIdx = mv.vanish.length - 1; //think "Rifle+Cannibal"
cc2c7183 1937 let trPiece = mv.vanish[lastIdx].p;
6b9320bb 1938 if (this.isKing(sx, sy))
cc2c7183 1939 trPiece = C.CannibalKingCode[trPiece];
b4ae3ff6
BA
1940 if (mv.appear.length >= 1)
1941 mv.appear[0].p = trPiece;
41534b92
BA
1942 else if (this.options["rifle"]) {
1943 mv.appear.unshift(
1944 new PiPo({
1945 x: sx,
1946 y: sy,
1947 c: initColor,
cc2c7183 1948 p: trPiece
41534b92
BA
1949 })
1950 );
1951 mv.vanish.unshift(
1952 new PiPo({
1953 x: sx,
1954 y: sy,
1955 c: initColor,
1956 p: initPiece
1957 })
1958 );
1959 }
1960 }
1961 }
1962 return mv;
1963 }
1964
1965 // En-passant square, if any
1966 getEpSquare(moveOrSquare) {
1967 if (typeof moveOrSquare === "string") {
1968 const square = moveOrSquare;
b4ae3ff6
BA
1969 if (square == "-")
1970 return undefined;
cc2c7183 1971 return C.SquareToCoords(square);
41534b92
BA
1972 }
1973 // Argument is a move:
1974 const move = moveOrSquare;
1975 const s = move.start,
1976 e = move.end;
1977 if (
1978 s.y == e.y &&
1979 Math.abs(s.x - e.x) == 2 &&
1980 // Next conditions for variants like Atomic or Rifle, Recycle...
65cf1690
BA
1981 (
1982 move.appear.length > 0 &&
ca8a3993 1983 this.getPieceType(0, 0, move.appear[0].p) == 'p'
65cf1690
BA
1984 )
1985 &&
1986 (
1987 move.vanish.length > 0 &&
ca8a3993 1988 this.getPieceType(0, 0, move.vanish[0].p) == 'p'
65cf1690 1989 )
41534b92
BA
1990 ) {
1991 return {
1992 x: (s.x + e.x) / 2,
1993 y: s.y
1994 };
1995 }
1996 return undefined; //default
1997 }
1998
1999 // Special case of en-passant captures: treated separately
c9ab0340 2000 getEnpassantCaptures([x, y]) {
41534b92 2001 const color = this.getColor(x, y);
c9ab0340 2002 const shiftX = (color == 'w' ? -1 : 1);
ceeac4e8 2003 const oppCols = this.getOppCols(color);
41534b92 2004 if (
ca8a3993 2005 this.epSquare &&
65203419 2006 this.epSquare.x == x + shiftX && //NOTE: epSquare.x not on edge
d262cff4 2007 Math.abs(this.getY(this.epSquare.y - y)) == 1 &&
ca8a3993
BA
2008 // Doublemove (and Progressive?) guards:
2009 this.board[this.epSquare.x][this.epSquare.y] == "" &&
ceeac4e8 2010 oppCols.includes(this.getColor(x, this.epSquare.y))
41534b92
BA
2011 ) {
2012 const [epx, epy] = [this.epSquare.x, this.epSquare.y];
b57b726c 2013 this.board[epx][epy] = this.board[x][this.epSquare.y];
ca8a3993 2014 let enpassantMove = this.getBasicMove([x, y], [epx, epy]);
41534b92
BA
2015 this.board[epx][epy] = "";
2016 const lastIdx = enpassantMove.vanish.length - 1; //think Rifle
2017 enpassantMove.vanish[lastIdx].x = x;
ca8a3993 2018 return [enpassantMove];
41534b92 2019 }
ca8a3993 2020 return [];
41534b92
BA
2021 }
2022
dcfaab5d 2023 getCastleMoves([x, y], finalSquares, castleWith, castleFlags) {
41534b92 2024 const c = this.getColor(x, y);
dcfaab5d 2025 castleFlags = castleFlags || this.castleFlags[c];
41534b92
BA
2026
2027 // Castling ?
ceeac4e8 2028 const oppCols = this.getOppCols(c);
41534b92
BA
2029 let moves = [];
2030 // King, then rook:
2031 finalSquares =
2032 finalSquares || [ [2, 3], [this.size.y - 2, this.size.y - 3] ];
cc2c7183 2033 const castlingKing = this.getPiece(x, y);
41534b92
BA
2034 castlingCheck: for (
2035 let castleSide = 0;
2036 castleSide < 2;
2037 castleSide++ //large, then small
2038 ) {
dcfaab5d 2039 if (castleFlags[castleSide] >= this.size.y)
b4ae3ff6 2040 continue;
41534b92
BA
2041 // If this code is reached, rook and king are on initial position
2042
2043 // NOTE: in some variants this is not a rook
dcfaab5d 2044 const rookPos = castleFlags[castleSide];
cc2c7183 2045 const castlingPiece = this.getPiece(x, rookPos);
41534b92
BA
2046 if (
2047 this.board[x][rookPos] == "" ||
2048 this.getColor(x, rookPos) != c ||
ca8a3993 2049 (castleWith && !castleWith.includes(castlingPiece))
41534b92
BA
2050 ) {
2051 // Rook is not here, or changed color (see Benedict)
2052 continue;
2053 }
2054 // Nothing on the path of the king ? (and no checks)
2055 const finDist = finalSquares[castleSide][0] - y;
2056 let step = finDist / Math.max(1, Math.abs(finDist));
2057 let i = y;
2058 do {
2059 if (
ca8a3993
BA
2060 // NOTE: next weird test because underCheck() verification
2061 // will be executed in filterValid() later.
2062 (
2063 i != finalSquares[castleSide][0] &&
ceeac4e8 2064 this.underCheck([[x, i]], oppCols)
ca8a3993
BA
2065 )
2066 ||
41534b92
BA
2067 (
2068 this.board[x][i] != "" &&
2069 // NOTE: next check is enough, because of chessboard constraints
2070 (this.getColor(x, i) != c || ![rookPos, y].includes(i))
2071 )
2072 ) {
2073 continue castlingCheck;
2074 }
2075 i += step;
2076 } while (i != finalSquares[castleSide][0]);
2077 // Nothing on the path to the rook?
2078 step = (castleSide == 0 ? -1 : 1);
2079 for (i = y + step; i != rookPos; i += step) {
b4ae3ff6
BA
2080 if (this.board[x][i] != "")
2081 continue castlingCheck;
41534b92
BA
2082 }
2083
2084 // Nothing on final squares, except maybe king and castling rook?
2085 for (i = 0; i < 2; i++) {
2086 if (
2087 finalSquares[castleSide][i] != rookPos &&
2088 this.board[x][finalSquares[castleSide][i]] != "" &&
2089 (
2090 finalSquares[castleSide][i] != y ||
2091 this.getColor(x, finalSquares[castleSide][i]) != c
2092 )
2093 ) {
2094 continue castlingCheck;
2095 }
2096 }
2097
ca8a3993 2098 // If this code is reached, castle is potentially valid
41534b92
BA
2099 moves.push(
2100 new Move({
2101 appear: [
2102 new PiPo({
2103 x: x,
2104 y: finalSquares[castleSide][0],
2105 p: castlingKing,
2106 c: c
2107 }),
2108 new PiPo({
2109 x: x,
2110 y: finalSquares[castleSide][1],
2111 p: castlingPiece,
2112 c: c
2113 })
2114 ],
2115 vanish: [
2116 // King might be initially disguised (Titan...)
2117 new PiPo({ x: x, y: y, p: castlingKing, c: c }),
2118 new PiPo({ x: x, y: rookPos, p: castlingPiece, c: c })
2119 ],
2120 end:
2121 Math.abs(y - rookPos) <= 2
c9ab0340
BA
2122 ? {x: x, y: rookPos}
2123 : {x: x, y: y + 2 * (castleSide == 0 ? -1 : 1)}
41534b92
BA
2124 })
2125 );
2126 }
2127
2128 return moves;
2129 }
2130
2131 ////////////////////
2132 // MOVES VALIDATION
2133
5006aaca 2134 // Is piece (or square) at given position attacked by "oppCol(s)" ?
ceeac4e8 2135 underAttack([x, y], oppCols) {
6b9320bb
BA
2136 // An empty square is considered as king,
2137 // since it's used only in getCastleMoves (TODO?)
2138 const king = this.board[x][y] == "" || this.isKing(x, y);
af9c9be3
BA
2139 return (
2140 (
2141 (!this.options["zen"] || king) &&
6b9320bb
BA
2142 this.findCapturesOn(
2143 [x, y],
2144 {
ceeac4e8 2145 byCol: oppCols,
6b9320bb
BA
2146 one: true
2147 }
2148 )
af9c9be3
BA
2149 )
2150 ||
2151 (
6b9320bb
BA
2152 (!!this.options["zen"] && !king) &&
2153 this.findDestSquares(
2154 [x, y],
2155 {
2156 attackOnly: true,
6b9320bb
BA
2157 one: true
2158 },
ceeac4e8 2159 ([i1, j1], [i2, j2]) => oppCols.includes(this.getColor(i2, j2))
6b9320bb 2160 )
af9c9be3
BA
2161 )
2162 );
2163 }
2164
f3e90e30 2165 // Argument is (very generally) an array of squares (= arrays)
ceeac4e8 2166 underCheck(square_s, oppCols) {
b4ae3ff6
BA
2167 if (this.options["taking"] || this.options["dark"])
2168 return false;
ceeac4e8 2169 return square_s.some(sq => this.underAttack(sq, oppCols));
41534b92
BA
2170 }
2171
a548cb4e 2172 // Scan board for king(s)
41534b92 2173 searchKingPos(color) {
a548cb4e 2174 let res = [];
41534b92
BA
2175 for (let i=0; i < this.size.x; i++) {
2176 for (let j=0; j < this.size.y; j++) {
6b9320bb 2177 if (this.getColor(i, j) == color && this.isKing(i, j))
a548cb4e 2178 res.push([i, j]);
41534b92
BA
2179 }
2180 }
a548cb4e 2181 return res;
41534b92
BA
2182 }
2183
de1421be
BA
2184 // cb: callback returning a boolean (false if king missing)
2185 trackKingWrap(move, kingPos, cb) {
f57232cd
BA
2186 if (move.appear.length == 0 && move.vanish.length == 0)
2187 return true;
2188 const color =
2189 (move.vanish.length > 0 ? move.vanish[0].c : move.appear[0].c);
de1421be
BA
2190 let newKingPP = null,
2191 sqIdx = 0,
2192 res = true; //a priori valid
2193 const oldKingPP =
2194 move.vanish.find(v => this.isKing(0, 0, v.p) && v.c == color);
2195 if (oldKingPP) {
2196 // Search king in appear array:
2197 newKingPP =
2198 move.appear.find(a => this.isKing(0, 0, a.p) && a.c == color);
2199 if (newKingPP) {
2200 sqIdx = kingPos.findIndex(kp =>
2201 kp[0] == oldKingPP.x && kp[1] == oldKingPP.y);
2202 kingPos[sqIdx] = [newKingPP.x, newKingPP.y];
2203 }
2204 else
2205 res = false; //king vanished
2206 }
2207 res &&= cb(kingPos);
2208 if (oldKingPP && newKingPP)
2209 kingPos[sqIdx] = [oldKingPP.x, oldKingPP.y];
2210 return res;
2211 }
2212
af9c9be3 2213 // 'color' arg because some variants (e.g. Refusal) check opponent moves
f5435757 2214 filterValid(moves, color) {
f5435757
BA
2215 if (!color)
2216 color = this.turn;
ceeac4e8 2217 const oppCols = this.getOppCols(color);
a548cb4e 2218 let kingPos = this.searchKingPos(color);
41534b92 2219 return moves.filter(m => {
b57b726c 2220 this.playOnBoard(m);
de1421be
BA
2221 const res = this.trackKingWrap(m, kingPos, (kp) => {
2222 return !this.underCheck(kp, oppCols);
2223 });
b57b726c
BA
2224 this.undoOnBoard(m);
2225 return res;
41534b92
BA
2226 });
2227 }
2228
2229 /////////////////
2230 // MOVES PLAYING
2231
41534b92
BA
2232 // Apply a move on board
2233 playOnBoard(move) {
6997e386
BA
2234 for (let psq of move.vanish)
2235 this.board[psq.x][psq.y] = "";
2236 for (let psq of move.appear)
2237 this.board[psq.x][psq.y] = psq.c + psq.p;
41534b92
BA
2238 }
2239 // Un-apply the played move
2240 undoOnBoard(move) {
6997e386
BA
2241 for (let psq of move.appear)
2242 this.board[psq.x][psq.y] = "";
2243 for (let psq of move.vanish)
2244 this.board[psq.x][psq.y] = psq.c + psq.p;
41534b92
BA
2245 }
2246
dcfaab5d 2247 // NOTE: arg "castleFlags" for Coregal or Twokings
3ca47832 2248 updateCastleFlags(move, castleFlags, king) {
dcfaab5d
BA
2249 castleFlags = castleFlags || this.castleFlags;
2250 // If flags already off, no need to re-check:
2251 if (
2252 Object.values(castleFlags).every(cvals =>
2253 cvals.every(val => val >= this.size.y))
2254 ) {
2255 return;
2256 }
41534b92
BA
2257 // Update castling flags if start or arrive from/at rook/king locations
2258 move.appear.concat(move.vanish).forEach(psq => {
8f879623 2259 if ((king && psq.p == king) || (!king && this.isKing(0, 0, psq.p)))
dcfaab5d 2260 castleFlags[psq.c] = [this.size.y, this.size.y];
41534b92 2261 // NOTE: not "else if" because king can capture enemy rook...
cc2c7183 2262 let c = "";
b4ae3ff6
BA
2263 if (psq.x == 0)
2264 c = "b";
2265 else if (psq.x == this.size.x - 1)
2266 c = "w";
cc2c7183 2267 if (c != "") {
dcfaab5d 2268 const fidx = castleFlags[c].findIndex(f => f == psq.y);
b4ae3ff6 2269 if (fidx >= 0)
dcfaab5d 2270 castleFlags[c][fidx] = this.size.y;
41534b92
BA
2271 }
2272 });
2273 }
2274
2275 prePlay(move) {
dcfaab5d 2276 if (this.hasCastle)
99ea2453 2277 this.updateCastleFlags(move);
99ea2453
BA
2278 if (this.options["crazyhouse"]) {
2279 move.vanish.forEach(v => {
2280 const square = C.CoordsToSquare({x: v.x, y: v.y});
2281 if (this.ispawn[square])
2282 delete this.ispawn[square];
2283 });
2284 if (move.appear.length > 0 && move.vanish.length > 0) {
2285 // Assumption: something is moving
2286 const initSquare = C.CoordsToSquare(move.start);
f429756d 2287 const destSquare = C.CoordsToSquare(move.end);
99ea2453
BA
2288 if (
2289 this.ispawn[initSquare] ||
ca8a3993 2290 (move.vanish[0].p == 'p' && move.appear[0].p != 'p')
41534b92 2291 ) {
f429756d
BA
2292 this.ispawn[destSquare] = true;
2293 }
2294 else if (
2295 this.ispawn[destSquare] &&
2296 this.getColor(move.end.x, move.end.y) != move.vanish[0].c
2297 ) {
ca8a3993 2298 move.vanish[1].p = 'p';
f429756d 2299 delete this.ispawn[destSquare];
41534b92
BA
2300 }
2301 }
2302 }
2303 const minSize = Math.min(move.appear.length, move.vanish.length);
0c44c676
BA
2304 if (
2305 this.hasReserve &&
2306 // Warning; atomic pawn removal isn't a capture
2307 (!this.options["atomic"] || !this.rempawn || this.movesCount >= 1)
2308 ) {
41534b92
BA
2309 const color = this.turn;
2310 for (let i=minSize; i<move.appear.length; i++) {
2311 // Something appears = dropped on board (some exceptions, Chakart...)
0c44c676
BA
2312 if (move.appear[i].c == color) {
2313 const piece = move.appear[i].p;
2314 this.updateReserve(color, piece, this.reserve[color][piece] - 1);
2315 }
41534b92
BA
2316 }
2317 for (let i=minSize; i<move.vanish.length; i++) {
2318 // Something vanish: add to reserve except if recycle & opponent
0c44c676
BA
2319 if (
2320 this.options["crazyhouse"] ||
2321 (this.options["recycle"] && move.vanish[i].c == color)
2322 ) {
2323 const piece = move.vanish[i].p;
41534b92 2324 this.updateReserve(color, piece, this.reserve[color][piece] + 1);
0c44c676 2325 }
41534b92
BA
2326 }
2327 }
2328 }
2329
2330 play(move) {
2331 this.prePlay(move);
b4ae3ff6
BA
2332 if (this.hasEnpassant)
2333 this.epSquare = this.getEpSquare(move);
41534b92
BA
2334 this.playOnBoard(move);
2335 this.postPlay(move);
2336 }
2337
2338 postPlay(move) {
b4ae3ff6 2339 if (this.options["dark"])
c9ab0340 2340 this.updateEnlightened();
41534b92
BA
2341 if (this.options["teleport"]) {
2342 if (
cc2c7183 2343 this.subTurnTeleport == 1 &&
41534b92 2344 move.vanish.length > move.appear.length &&
518bfb7a 2345 move.vanish[1].c == this.turn
41534b92
BA
2346 ) {
2347 const v = move.vanish[move.vanish.length - 1];
2348 this.captured = {x: v.x, y: v.y, c: v.c, p: v.p};
cc2c7183 2349 this.subTurnTeleport = 2;
41534b92
BA
2350 return;
2351 }
cc2c7183 2352 this.subTurnTeleport = 1;
41534b92
BA
2353 this.captured = null;
2354 }
182ba661
BA
2355 this.tryChangeTurn(move);
2356 }
2357
2358 tryChangeTurn(move) {
5f08c59b 2359 if (this.isLastMove(move)) {
bc97fdd1 2360 this.turn = C.GetOppTurn(this.turn);
5f08c59b
BA
2361 this.movesCount++;
2362 this.subTurn = 1;
41534b92 2363 }
af9c9be3
BA
2364 else if (!move.next)
2365 this.subTurn++;
5f08c59b
BA
2366 }
2367
2368 isLastMove(move) {
af9c9be3
BA
2369 if (move.next)
2370 return false;
2371 const color = this.turn;
ceeac4e8
BA
2372 const oppKingPos = this.searchKingPos(C.GetOppTurn(color));
2373 if (oppKingPos.length == 0 || this.underCheck(oppKingPos, [color]))
af9c9be3 2374 return true;
5f08c59b 2375 return (
af9c9be3
BA
2376 (
2377 !this.options["balance"] ||
6b9320bb
BA
2378 ![1, 2].includes(this.movesCount) ||
2379 this.subTurn == 2
af9c9be3
BA
2380 )
2381 &&
2382 (
2383 !this.options["doublemove"] ||
2384 this.movesCount == 0 ||
2385 this.subTurn == 2
2386 )
2387 &&
2388 (
2389 !this.options["progressive"] ||
2390 this.subTurn == this.movesCount + 1
2391 )
5f08c59b 2392 );
41534b92
BA
2393 }
2394
2395 // "Stop at the first move found"
2396 atLeastOneMove(color) {
41534b92
BA
2397 for (let i = 0; i < this.size.x; i++) {
2398 for (let j = 0; j < this.size.y; j++) {
2399 if (this.board[i][j] != "" && this.getColor(i, j) == color) {
cc2c7183
BA
2400 // NOTE: in fact searching for all potential moves from i,j.
2401 // I don't believe this is an issue, for now at least.
de1421be 2402 const moves = this.getPotentialMovesFrom([i, j], color);
b4ae3ff6
BA
2403 if (moves.some(m => this.filterValid([m]).length >= 1))
2404 return true;
41534b92
BA
2405 }
2406 }
2407 }
2408 if (this.hasReserve && this.reserve[color]) {
2409 for (let p of Object.keys(this.reserve[color])) {
2410 const moves = this.getDropMovesFrom([color, p]);
b4ae3ff6
BA
2411 if (moves.some(m => this.filterValid([m]).length >= 1))
2412 return true;
41534b92
BA
2413 }
2414 }
2415 return false;
2416 }
2417
2418 // What is the score ? (Interesting if game is over)
d6d0a46e
BA
2419 getCurrentScore(move_s) {
2420 const move = move_s[move_s.length - 1];
2421 // Shortcut in case the score was computed before:
2422 if (move.result)
2423 return move.result;
ceeac4e8 2424 const oppTurn = C.GetOppTurn(this.turn);
a548cb4e 2425 const kingPos = {
ceeac4e8
BA
2426 w: this.searchKingPos('w'),
2427 b: this.searchKingPos('b')
a548cb4e 2428 };
ceeac4e8 2429 if (kingPos[this.turn].length == 0 && kingPos[oppTurn].length == 0)
b4ae3ff6 2430 return "1/2";
ceeac4e8 2431 if (kingPos[this.turn].length == 0)
b57b726c 2432 return (this.turn == "w" ? "0-1" : "1-0");
ceeac4e8 2433 if (kingPos[oppTurn].length == 0)
b57b726c 2434 return (this.turn == "w" ? "1-0" : "0-1");
ceeac4e8 2435 if (this.atLeastOneMove(this.turn))
b4ae3ff6 2436 return "*";
41534b92 2437 // No valid move: stalemate or checkmate?
ceeac4e8 2438 if (!this.underCheck(kingPos[this.turn], this.getOppCols(this.turn)))
b4ae3ff6 2439 return "1/2";
41534b92 2440 // OK, checkmate
ceeac4e8 2441 return (this.turn == "w" ? "0-1" : "1-0");
41534b92
BA
2442 }
2443
41534b92
BA
2444 playVisual(move, r) {
2445 move.vanish.forEach(v => {
bc97fdd1
BA
2446 if (this.g_pieces[v.x][v.y]) //can be null (e.g. Apocalypse)
2447 this.g_pieces[v.x][v.y].remove();
c9ab0340 2448 this.g_pieces[v.x][v.y] = null;
41534b92 2449 });
3c61449b
BA
2450 let chessboard =
2451 document.getElementById(this.containerId).querySelector(".chessboard");
b4ae3ff6
BA
2452 if (!r)
2453 r = chessboard.getBoundingClientRect();
41534b92
BA
2454 const pieceWidth = this.getPieceWidth(r.width);
2455 move.appear.forEach(a => {
41534b92 2456 this.g_pieces[a.x][a.y] = document.createElement("piece");
2159c239
BA
2457 C.AddClass_es(this.g_pieces[a.x][a.y],
2458 this.pieces(a.c, a.x, a.y)[a.p]["class"]);
616a8d7a 2459 this.g_pieces[a.x][a.y].classList.add(V.GetColorClass(a.c));
41534b92
BA
2460 this.g_pieces[a.x][a.y].style.width = pieceWidth + "px";
2461 this.g_pieces[a.x][a.y].style.height = pieceWidth + "px";
2462 const [ip, jp] = this.getPixelPosition(a.x, a.y, r);
9db5050a
BA
2463 // Translate coordinates to use chessboard as reference:
2464 this.g_pieces[a.x][a.y].style.transform =
2465 `translate(${ip - r.x}px,${jp - r.y}px)`;
c9ab0340
BA
2466 if (this.enlightened && !this.enlightened[a.x][a.y])
2467 this.g_pieces[a.x][a.y].classList.add("hidden");
3c61449b 2468 chessboard.appendChild(this.g_pieces[a.x][a.y]);
41534b92 2469 });
c9ab0340
BA
2470 if (this.options["dark"])
2471 this.graphUpdateEnlightened();
41534b92
BA
2472 }
2473
5f08c59b 2474 // TODO: send stack receive stack, or allow incremental? (good/bad points)
e7d409fc 2475 buildMoveStack(move, r) {
5f08c59b
BA
2476 this.moveStack.push(move);
2477 this.computeNextMove(move);
b9877ed2
BA
2478 const then = () => {
2479 const newTurn = this.turn;
2480 if (this.moveStack.length == 1 && !this.hideMoves)
2481 this.playVisual(move, r);
2482 if (move.next) {
2483 this.gameState = {
2484 fen: this.getFen(),
2485 board: JSON.parse(JSON.stringify(this.board)) //easier
2486 };
2487 this.buildMoveStack(move.next, r);
5f08c59b
BA
2488 }
2489 else {
b9877ed2
BA
2490 if (this.moveStack.length == 1) {
2491 // Usual case (one normal move)
2492 this.afterPlay(this.moveStack, newTurn, {send: true, res: true});
2493 this.moveStack = [];
2494 }
2495 else {
2496 this.afterPlay(this.moveStack, newTurn, {send: true, res: false});
2497 this.re_initFromFen(this.gameState.fen, this.gameState.board);
2498 this.playReceivedMove(this.moveStack.slice(1), () => {
2499 this.afterPlay(this.moveStack, newTurn, {send: false, res: true});
2500 this.moveStack = [];
2501 });
2502 }
5f08c59b 2503 }
b9877ed2
BA
2504 };
2505 // If hiding moves, then they are revealed in play() with callback
2506 this.play(move, this.hideMoves ? then : null);
2507 if (!this.hideMoves)
2508 then();
41534b92
BA
2509 }
2510
5f08c59b
BA
2511 // Implemented in variants using (automatic) moveStack
2512 computeNextMove(move) {}
2513
5f08c59b
BA
2514 animateMoving(start, end, drag, segments, cb) {
2515 let initPiece = this.getDomPiece(start.x, start.y);
bc97fdd1
BA
2516 if (!initPiece) { //TODO: shouldn't occur!
2517 cb();
2518 return;
2519 }
5f08c59b 2520 // NOTE: cloning often not required, but light enough, and simpler
9db5050a
BA
2521 let movingPiece = initPiece.cloneNode();
2522 initPiece.style.opacity = "0";
2523 let container =
2524 document.getElementById(this.containerId)
2525 const r = container.querySelector(".chessboard").getBoundingClientRect();
5f08c59b 2526 if (typeof start.x == "string") {
082e639a
BA
2527 // Need to bound width/height (was 100% for reserve pieces)
2528 const pieceWidth = this.getPieceWidth(r.width);
2529 movingPiece.style.width = pieceWidth + "px";
2530 movingPiece.style.height = pieceWidth + "px";
2531 }
f55a0a67 2532 const maxDist = this.getMaxDistance(r);
5f08c59b
BA
2533 const apparentColor = this.getColor(start.x, start.y);
2534 const pieces = this.pieces(apparentColor, start.x, start.y);
2535 if (drag) {
2536 const startCode = this.getPiece(start.x, start.y);
3b641716 2537 C.RemoveClass_es(movingPiece, pieces[startCode]["class"]);
5f08c59b
BA
2538 C.AddClass_es(movingPiece, pieces[drag.p]["class"]);
2539 if (apparentColor != drag.c) {
616a8d7a
BA
2540 movingPiece.classList.remove(V.GetColorClass(apparentColor));
2541 movingPiece.classList.add(V.GetColorClass(drag.c));
41534b92 2542 }
41534b92 2543 }
9db5050a 2544 container.appendChild(movingPiece);
15106e82 2545 const animateSegment = (index, cb) => {
9db5050a 2546 // NOTE: move.drag could be generalized per-segment (usage?)
5f08c59b
BA
2547 const [i1, j1] = segments[index][0];
2548 const [i2, j2] = segments[index][1];
15106e82
BA
2549 const dep = this.getPixelPosition(i1, j1, r);
2550 const arr = this.getPixelPosition(i2, j2, r);
9db5050a
BA
2551 movingPiece.style.transitionDuration = "0s";
2552 movingPiece.style.transform = `translate(${dep[0]}px, ${dep[1]}px)`;
15106e82
BA
2553 const distance =
2554 Math.sqrt((arr[0] - dep[0]) ** 2 + (arr[1] - dep[1]) ** 2);
2555 const duration = 0.2 + (distance / maxDist) * 0.3;
9db5050a
BA
2556 // TODO: unclear why we need this new delay below:
2557 setTimeout(() => {
2558 movingPiece.style.transitionDuration = duration + "s";
adf7c659 2559 // movingPiece is child of container: no need to adjust coordinates
9db5050a
BA
2560 movingPiece.style.transform = `translate(${arr[0]}px, ${arr[1]}px)`;
2561 setTimeout(cb, duration * 1000);
2562 }, 50);
15106e82 2563 };
15106e82 2564 let index = 0;
635418a5 2565 const animateSegmentCallback = () => {
5f08c59b 2566 if (index < segments.length)
635418a5 2567 animateSegment(index++, animateSegmentCallback);
15106e82 2568 else {
9db5050a
BA
2569 movingPiece.remove();
2570 initPiece.style.opacity = "1";
5f08c59b 2571 cb();
15106e82 2572 }
635418a5
BA
2573 };
2574 animateSegmentCallback();
41534b92
BA
2575 }
2576
5f08c59b
BA
2577 // Input array of objects with at least fields x,y (e.g. PiPo)
2578 animateFading(arr, cb) {
2579 const animLength = 350; //TODO: 350ms? More? Less?
2580 arr.forEach(v => {
2581 let fadingPiece = this.getDomPiece(v.x, v.y);
2582 fadingPiece.style.transitionDuration = (animLength / 1000) + "s";
2583 fadingPiece.style.opacity = "0";
2584 });
2585 setTimeout(cb, animLength);
2586 }
2587
2588 animate(move, callback) {
2589 if (this.noAnimate || move.noAnimate) {
2590 callback();
2591 return;
2592 }
2593 let segments = move.segments;
2594 if (!segments)
2595 segments = [ [[move.start.x, move.start.y], [move.end.x, move.end.y]] ];
2596 let targetObj = new TargetObj(callback);
2597 if (move.start.x != move.end.x || move.start.y != move.end.y) {
2598 targetObj.target++;
2599 this.animateMoving(move.start, move.end, move.drag, segments,
2600 () => targetObj.increment());
2601 }
2602 if (move.vanish.length > move.appear.length) {
2603 const arr = move.vanish.slice(move.appear.length)
e7d409fc
BA
2604 // Ignore disappearing pieces hidden by some appearing ones:
2605 .filter(v => move.appear.every(a => a.x != v.x || a.y != v.y));
5f08c59b
BA
2606 if (arr.length > 0) {
2607 targetObj.target++;
2608 this.animateFading(arr, () => targetObj.increment());
2609 }
2610 }
462947f0
BA
2611 targetObj.target +=
2612 this.tryAnimateCastle(move, () => targetObj.increment());
5f08c59b
BA
2613 targetObj.target +=
2614 this.customAnimate(move, segments, () => targetObj.increment());
2615 if (targetObj.target == 0)
2616 callback();
2617 }
2618
462947f0
BA
2619 tryAnimateCastle(move, cb) {
2620 if (
2621 this.hasCastle &&
2622 move.vanish.length == 2 &&
2623 move.appear.length == 2 &&
2624 this.isKing(0, 0, move.vanish[0].p) &&
2625 this.isKing(0, 0, move.appear[0].p)
2626 ) {
2627 const start = {x: move.vanish[1].x, y: move.vanish[1].y},
2628 end = {x: move.appear[1].x, y: move.appear[1].y};
2629 const segments = [ [[start.x, start.y], [end.x, end.y]] ];
2630 this.animateMoving(start, end, null, segments, cb);
2631 return 1;
2632 }
2633 return 0;
2634 }
2635
5f08c59b
BA
2636 // Potential other animations (e.g. for Suction variant)
2637 customAnimate(move, segments, cb) {
2638 return 0; //nb of targets
2639 }
2640
126ffc70 2641 launchAnimation(moves, container, callback) {
98d14451 2642 if (this.hideMoves) {
b9877ed2
BA
2643 for (let i=0; i<moves.length; i++)
2644 // If hiding moves, they are revealed into play():
2645 this.play(moves[i], i == moves.length - 1 ? callback : () => {});
98d14451
BA
2646 return;
2647 }
2648 const r = container.querySelector(".chessboard").getBoundingClientRect();
2649 const animateRec = i => {
2650 this.animate(moves[i], () => {
2651 this.play(moves[i]);
2652 this.playVisual(moves[i], r);
2653 if (i < moves.length - 1)
2654 setTimeout(() => animateRec(i+1), 300);
2655 else
2656 callback();
2657 });
21e8e712 2658 };
98d14451
BA
2659 animateRec(0);
2660 }
2661
2662 playReceivedMove(moves, callback) {
e081c5eb
BA
2663 // Delay if user wasn't focused:
2664 const checkDisplayThenAnimate = (delay) => {
3c61449b 2665 if (container.style.display == "none") {
21e8e712
BA
2666 alert("New move! Let's go back to game...");
2667 document.getElementById("gameInfos").style.display = "none";
3c61449b 2668 container.style.display = "block";
126ffc70
BA
2669 setTimeout(
2670 () => this.launchAnimation(moves, container, callback),
2671 700
2672 );
2673 }
2674 else {
2675 setTimeout(
2676 () => this.launchAnimation(moves, container, callback),
2677 delay || 0
2678 );
21e8e712 2679 }
21e8e712 2680 };
3c61449b 2681 let container = document.getElementById(this.containerId);
016306e3
BA
2682 if (document.hidden) {
2683 document.onvisibilitychange = () => {
c9a20f4f 2684 // TODO here: page reload ?! (some issues if tab changed...)
016306e3 2685 document.onvisibilitychange = undefined;
e081c5eb 2686 checkDisplayThenAnimate(700);
fd31883b 2687 };
fd31883b 2688 }
b4ae3ff6
BA
2689 else
2690 checkDisplayThenAnimate();
41534b92
BA
2691 }
2692
2693};