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55d3b31f BA |
1 | import ChessRules from "/base_rules.js"; |
2 | import PiPo from "/utils/PiPo.js"; | |
3 | import Move from "/utils/Move.js"; | |
4 | ||
5 | export default class CheckeredRules extends ChessRules { | |
6 | ||
7 | static get Options() { | |
8 | return { | |
9 | select: C.Options.select, | |
10 | input: [ | |
11 | { | |
12 | label: "Allow switching", | |
13 | variable: "withswitch", | |
14 | type: "checkbox", | |
15 | defaut: false | |
16 | } | |
17 | ], | |
55d3b31f BA |
18 | styles: [ |
19 | "balance", | |
20 | "capture", | |
21 | "cylinder", | |
22 | "doublemove", | |
23 | "madrasi", | |
24 | "progressive", | |
25 | "recycle", | |
26 | "teleport" | |
27 | ] | |
28 | }; | |
29 | } | |
30 | ||
31 | static board2fen(b) { | |
32 | const checkered_codes = { | |
33 | p: "s", | |
34 | q: "t", | |
35 | r: "u", | |
36 | b: "c", | |
37 | n: "o" | |
38 | }; | |
8d19ea48 BA |
39 | if (b[0] == "c") |
40 | return checkered_codes[b[1]]; | |
55d3b31f BA |
41 | return super.board2fen(b); |
42 | } | |
43 | ||
44 | static fen2board(f) { | |
45 | // Tolerate upper-case versions of checkered pieces (why not?) | |
46 | const checkered_pieces = { | |
47 | s: "p", | |
48 | S: "p", | |
49 | t: "q", | |
50 | T: "q", | |
51 | u: "r", | |
52 | U: "r", | |
53 | c: "b", | |
54 | C: "b", | |
55 | o: "n", | |
56 | O: "n" | |
57 | }; | |
58 | if (Object.keys(checkered_pieces).includes(f)) | |
59 | return "c" + checkered_pieces[f]; | |
60 | return super.fen2board(f); | |
61 | } | |
62 | ||
5006aaca BA |
63 | getPartFen(o) { |
64 | let parts = super.getPartFen(o); | |
65 | parts["cmove"] = this.getCmoveFen(); | |
66 | parts["stage"] = this.getStageFen(); | |
67 | return parts; | |
68 | } | |
69 | ||
70 | getCmoveFen() { | |
71 | if (!this.cmove) | |
72 | return "-"; | |
73 | return ( | |
74 | C.CoordsToSquare(this.cmove.start) + C.CoordsToSquare(this.cmove.end) | |
75 | ); | |
76 | } | |
77 | ||
78 | getStageFen() { | |
79 | return (this.stage + this.sideCheckered); | |
80 | } | |
81 | ||
82 | getFlagsFen() { | |
83 | let fen = super.getFlagsFen(); | |
84 | // Add pawns flags | |
85 | for (let c of ["w", "b"]) | |
86 | for (let i = 0; i < 8; i++) | |
87 | fen += (this.pawnFlags[c][i] ? "1" : "0"); | |
88 | return fen; | |
89 | } | |
90 | ||
91 | getPawnShift(color) { | |
92 | return super.getPawnShift(color == 'c' ? this.turn : color); | |
93 | } | |
94 | ||
8d19ea48 BA |
95 | pieces(color, x, y) { |
96 | let baseRes = super.pieces(color, x, y); | |
97 | if ( | |
98 | this.getPiece(x, y) == 'p' && | |
99 | this.stage == 2 && | |
100 | this.getColor(x, y) == 'c' | |
101 | ) { | |
102 | // Checkered pawns on stage 2 are bidirectional | |
103 | const initRank = ((color == 'w' && x >= 6) || (color == 'b' && x <= 1)); | |
104 | baseRes['p'] = { | |
105 | "class": "pawn", | |
106 | moves: [ | |
107 | { | |
108 | steps: [[1, 0], [-1, 0]], | |
109 | range: (initRank ? 2 : 1) | |
110 | } | |
111 | ], | |
112 | attack: [ | |
113 | { | |
114 | steps: [[1, 1], [1, -1], [-1, 1], [-1, -1]], | |
115 | range: 1 | |
116 | } | |
117 | ] | |
118 | }; | |
119 | } | |
120 | const checkered = { | |
121 | 's': {"class": "checkered-pawn", moveas: 'p'}, | |
122 | 'u': {"class": "checkered-rook", moveas: 'r'}, | |
123 | 'o': {"class": "checkered-knight", moveas: 'n'}, | |
124 | 'c': {"class": "checkered-bishop", moveas: 'b'}, | |
125 | 't': {"class": "checkered-queen", moveas: 'q'} | |
126 | }; | |
127 | return Object.assign(baseRes, checkered); | |
128 | } | |
55d3b31f BA |
129 | |
130 | setOtherVariables(fenParsed) { | |
131 | super.setOtherVariables(fenParsed); | |
132 | // Non-capturing last checkered move (if any) | |
133 | const cmove = fenParsed.cmove; | |
134 | if (cmove == "-") this.cmove = null; | |
135 | else { | |
136 | this.cmove = { | |
137 | start: C.SquareToCoords(cmove.substr(0, 2)), | |
138 | end: C.SquareToCoords(cmove.substr(2)) | |
139 | }; | |
140 | } | |
141 | // Stage 1: as Checkered2. Stage 2: checkered pieces are autonomous | |
142 | const stageInfo = fenParsed.stage; | |
143 | this.stage = parseInt(stageInfo[0], 10); | |
5006aaca | 144 | this.sideCheckered = (this.stage == 2 ? stageInfo[1] : ""); |
55d3b31f BA |
145 | } |
146 | ||
147 | setFlags(fenflags) { | |
148 | super.setFlags(fenflags); //castleFlags | |
149 | this.pawnFlags = { | |
150 | w: [...Array(8)], //pawns can move 2 squares? | |
151 | b: [...Array(8)] | |
152 | }; | |
153 | const flags = fenflags.substr(4); //skip first 4 letters, for castle | |
154 | for (let c of ["w", "b"]) { | |
155 | for (let i = 0; i < 8; i++) | |
156 | this.pawnFlags[c][i] = flags.charAt((c == "w" ? 0 : 8) + i) == "1"; | |
157 | } | |
158 | } | |
159 | ||
160 | aggregateFlags() { | |
161 | return [this.castleFlags, this.pawnFlags]; | |
162 | } | |
163 | ||
164 | disaggregateFlags(flags) { | |
165 | this.castleFlags = flags[0]; | |
166 | this.pawnFlags = flags[1]; | |
167 | } | |
168 | ||
169 | getEpSquare(moveOrSquare) { | |
170 | // At stage 2, all pawns can be captured en-passant | |
171 | if ( | |
172 | this.stage == 2 || | |
173 | typeof moveOrSquare !== "object" || | |
174 | (moveOrSquare.appear.length > 0 && moveOrSquare.appear[0].c != 'c') | |
175 | ) | |
176 | return super.getEpSquare(moveOrSquare); | |
177 | // Checkered or switch move: no en-passant | |
178 | return undefined; | |
179 | } | |
180 | ||
181 | getCmove(move) { | |
182 | // No checkered move to undo at stage 2: | |
183 | if (this.stage == 1 && move.vanish.length == 1 && move.appear[0].c == "c") | |
5006aaca | 184 | return {start: move.start, end: move.end}; |
55d3b31f BA |
185 | return null; |
186 | } | |
187 | ||
188 | canTake([x1, y1], [x2, y2]) { | |
189 | const color1 = this.getColor(x1, y1); | |
190 | const color2 = this.getColor(x2, y2); | |
191 | if (this.stage == 2) { | |
192 | // Black & White <-- takes --> Checkered | |
193 | const color1 = this.getColor(x1, y1); | |
194 | const color2 = this.getColor(x2, y2); | |
195 | return color1 != color2 && [color1, color2].includes('c'); | |
196 | } | |
55d3b31f BA |
197 | return ( |
198 | color1 != color2 && | |
8d19ea48 | 199 | color2 != "c" && //checkered aren't captured |
55d3b31f BA |
200 | (color1 != "c" || color2 != this.turn) |
201 | ); | |
202 | } | |
203 | ||
8d19ea48 BA |
204 | postProcessPotentialMoves(moves) { |
205 | if (this.stage == 2 || moves.length == 0) | |
206 | return moves; | |
207 | const color = this.turn; | |
208 | // Apply "checkerization" of standard moves | |
209 | const lastRank = (color == "w" ? 0 : 7); | |
210 | const [x, y] = [moves[0].start.x, moves[0].start.y]; | |
211 | let moves = []; | |
212 | const piece = this.getPiece(x, y); | |
213 | // King is treated differently: it never turn checkered | |
214 | if (piece == 'k') { | |
215 | // If at least one checkered piece, allow switching: | |
216 | if ( | |
5006aaca | 217 | this.options["withswitch"] && |
8d19ea48 BA |
218 | this.board.some(b => b.some(cell => cell[0] == 'c')) |
219 | ) { | |
220 | const oppCol = C.GetOppCol(color); | |
221 | const oppKingPos = this.searchKingPos(oppCol)[0]; | |
222 | moves.push( | |
223 | new Move({ | |
224 | start: { x: x, y: y }, | |
225 | end: { x: oppKingPos[0], y: oppKingPos[1] }, | |
226 | appear: [], | |
227 | vanish: [] | |
228 | }) | |
229 | ); | |
55d3b31f | 230 | } |
8d19ea48 BA |
231 | return moves; |
232 | } | |
233 | if (piece == 'p') { | |
234 | // Filter out forbidden pawn moves | |
235 | moves = moves.filter(m => { | |
236 | if (m.vanish[0].p == 'p') { | |
55d3b31f BA |
237 | if ( |
238 | Math.abs(m.end.x - m.start.x) == 2 && | |
239 | !this.pawnFlags[this.turn][m.start.y] | |
240 | ) { | |
8d19ea48 | 241 | return false; //forbidden 2-squares jumps |
55d3b31f BA |
242 | } |
243 | if ( | |
244 | this.board[m.end.x][m.end.y] == V.EMPTY && | |
245 | m.vanish.length == 2 && | |
246 | this.getColor(m.start.x, m.start.y) == "c" | |
247 | ) { | |
8d19ea48 | 248 | return false; //checkered pawns cannot take en-passant |
55d3b31f BA |
249 | } |
250 | } | |
8d19ea48 | 251 | return true; |
55d3b31f | 252 | }); |
55d3b31f | 253 | } |
8d19ea48 BA |
254 | let extraMoves = []; |
255 | moves.forEach(m => { | |
256 | if (m.vanish.length == 2 && m.appear.length == 1) | |
257 | // A capture occured | |
258 | m.appear[0].c = "c"; | |
259 | if ( | |
260 | m.appear[0].p != m.vanish[1].p && | |
261 | // No choice if promotion: | |
262 | (m.vanish[0].p != 'p' || m.end.x != lastRank) | |
263 | ) { | |
264 | // Add transformation into captured piece | |
265 | let m2 = JSON.parse(JSON.stringify(m)); | |
266 | m2.appear[0].p = m.vanish[1].p; | |
267 | extraMoves.push(m2); | |
268 | } | |
55d3b31f | 269 | } |
8d19ea48 BA |
270 | }); |
271 | return moves.concat(extraMoves); | |
55d3b31f BA |
272 | } |
273 | ||
274 | canIplay(side, [x, y]) { | |
275 | if (this.stage == 2) { | |
276 | const color = this.getColor(x, y); | |
277 | return ( | |
278 | this.turn == this.sideCheckered | |
279 | ? color == 'c' | |
280 | : ['w', 'b'].includes(color) | |
281 | ); | |
282 | } | |
283 | return side == this.turn && [side, "c"].includes(this.getColor(x, y)); | |
284 | } | |
285 | ||
286 | // Does m2 un-do m1 ? (to disallow undoing checkered moves) | |
287 | oppositeMoves(m1, m2) { | |
288 | return ( | |
289 | !!m1 && | |
55d3b31f BA |
290 | m2.appear.length == 1 && |
291 | m2.vanish.length == 1 && | |
5006aaca | 292 | m2.appear[0].c == "c" && |
55d3b31f BA |
293 | m1.start.x == m2.end.x && |
294 | m1.end.x == m2.start.x && | |
295 | m1.start.y == m2.end.y && | |
296 | m1.end.y == m2.start.y | |
297 | ); | |
298 | } | |
299 | ||
55d3b31f | 300 | filterValid(moves) { |
55d3b31f | 301 | const color = this.turn; |
5006aaca BA |
302 | if (stage == 2 && this.sideCheckered == color) |
303 | // Checkered cannot be under check (no king) | |
304 | return moves; | |
305 | let kingPos = super.searchKingPos(color); | |
8d19ea48 | 306 | const oppCol = C.GetOppCol(color); |
5006aaca BA |
307 | if (this.stage == 2) |
308 | // Must consider both kings (attacked by checkered side) | |
309 | kingPos = [kingPos, super.searchKingPos(oppCol)]; | |
55d3b31f | 310 | return moves.filter(m => { |
8d19ea48 | 311 | this.playOnBoard(m); |
55d3b31f | 312 | let res = true; |
5006aaca BA |
313 | if (stage == 1) |
314 | res = !this.oppositeMoves(this.cmove, m); | |
315 | if (res && m.appear.length > 0) | |
316 | // NOTE: oppCol might be inaccurate; fixed in underCheck() | |
317 | res = !this.underCheck(kingPos, oppCol); | |
318 | this.undoOnBoard(m); | |
55d3b31f BA |
319 | return res; |
320 | }); | |
321 | } | |
322 | ||
5006aaca BA |
323 | atLeastOneMove(color) { |
324 | const oppCol = C.GetOppCol(color); | |
325 | for (let i = 0; i < this.size.x; i++) { | |
326 | for (let j = 0; j < this.size.y; j++) { | |
55d3b31f BA |
327 | const colIJ = this.getColor(i, j); |
328 | if ( | |
5006aaca | 329 | this.board[i][j] != "" && |
55d3b31f BA |
330 | ( |
331 | (this.stage == 1 && colIJ != oppCol) || | |
332 | (this.stage == 2 && | |
333 | ( | |
334 | (this.sideCheckered == color && colIJ == 'c') || | |
335 | (this.sideCheckered != color && ['w', 'b'].includes(colIJ)) | |
336 | ) | |
337 | ) | |
338 | ) | |
339 | ) { | |
8d19ea48 | 340 | const moves = this.getPotentialMovesFrom([i, j]); |
5006aaca BA |
341 | if (moves.some(m => this.filterValid([m]).length >= 1)) |
342 | return true; | |
55d3b31f BA |
343 | } |
344 | } | |
345 | } | |
346 | return false; | |
347 | } | |
348 | ||
5006aaca | 349 | underCheck(square_s, oppCol) { |
55d3b31f | 350 | if (this.stage == 1) |
5006aaca BA |
351 | return super.underAttack(square_s, [oppCol, 'c']); |
352 | if (oppCol != this.sideCheckered) | |
353 | return false; //checkered pieces is me, I'm not under check | |
354 | return super.underAttack(square_s, 'c'); | |
55d3b31f BA |
355 | } |
356 | ||
5006aaca BA |
357 | prePlay(move) { |
358 | if (move.appear.length > 0 && move.vanish.length > 0) { | |
359 | super.prePlay(move); | |
55d3b31f BA |
360 | if ( |
361 | [1, 6].includes(move.start.x) && | |
362 | move.vanish[0].p == V.PAWN && | |
363 | Math.abs(move.end.x - move.start.x) == 2 | |
364 | ) { | |
365 | // This move turns off a 2-squares pawn flag | |
366 | this.pawnFlags[move.start.x == 6 ? "w" : "b"][move.start.y] = false; | |
367 | } | |
368 | } | |
5006aaca BA |
369 | } |
370 | ||
371 | postPlay(move) { | |
372 | if (move.appear.length == 0 && move.vanish.length == 0) { | |
373 | this.stage = 2; | |
374 | this.sideCheckered = this.turn; | |
375 | } | |
376 | else | |
377 | super.postPlay(move); | |
55d3b31f BA |
378 | this.cmove = this.getCmove(move); |
379 | } | |
380 | ||
5006aaca BA |
381 | tryChangeTurn(move) { |
382 | if (move.appear.length > 0 && move.vanish.length > 0) | |
383 | super.tryChangeTurn(move); | |
384 | } | |
385 | ||
55d3b31f BA |
386 | getCurrentScore() { |
387 | const color = this.turn; | |
388 | if (this.stage == 1) { | |
5006aaca BA |
389 | if (this.atLeastOneMove(color)) |
390 | return "*"; | |
55d3b31f | 391 | // Artifically change turn, for checkered pawns |
5006aaca BA |
392 | const oppCol = C.GetOppCol(color); |
393 | this.turn = oppCol; | |
394 | const kingPos = super.searchKingPos(color)[0]; | |
395 | let res = "1/2"; | |
396 | if (super.underAttack(kingPos, [oppCol, 'c'])) | |
397 | res = (color == "w" ? "0-1" : "1-0"); | |
398 | this.turn = color; | |
55d3b31f BA |
399 | return res; |
400 | } | |
401 | // Stage == 2: | |
5006aaca | 402 | if (this.sideCheckered == color) { |
55d3b31f BA |
403 | // Check if remaining checkered pieces: if none, I lost |
404 | if (this.board.some(b => b.some(cell => cell[0] == 'c'))) { | |
5006aaca BA |
405 | if (!this.atLeastOneMove(color)) |
406 | return "1/2"; | |
55d3b31f BA |
407 | return "*"; |
408 | } | |
5006aaca | 409 | return (color == 'w' ? "0-1" : "1-0"); |
55d3b31f | 410 | } |
5006aaca BA |
411 | if (this.atLeastOneMove(color)) |
412 | return "*"; | |
413 | let res = super.underAttack(super.searchKingPos(color)[0], 'c'); | |
414 | if (!res) | |
415 | res = super.underAttack(super.searchKingPos(oppCol)[0], 'c'); | |
416 | if (res) | |
417 | return (color == 'w' ? "0-1" : "1-0"); | |
55d3b31f BA |
418 | return "1/2"; |
419 | } | |
420 | ||
55d3b31f | 421 | }; |