| 1 | import { ChessRules, PiPo } from "@/base_rules"; |
| 2 | |
| 3 | export class SchessRules extends ChessRules { |
| 4 | static get PawnSpecs() { |
| 5 | return Object.assign( |
| 6 | {}, |
| 7 | ChessRules.PawnSpecs, |
| 8 | { |
| 9 | promotions: |
| 10 | ChessRules.PawnSpecs.promotions.concat([V.HAWK, V.ELEPHANT]) |
| 11 | } |
| 12 | ); |
| 13 | } |
| 14 | |
| 15 | static get HAWK() { |
| 16 | return 'h'; |
| 17 | } |
| 18 | |
| 19 | static get ELEPHANT() { |
| 20 | return 'e'; |
| 21 | } |
| 22 | |
| 23 | static get NOTHING() { |
| 24 | return 'o'; |
| 25 | } |
| 26 | |
| 27 | static get PIECES() { |
| 28 | return ChessRules.PIECES.concat([V.HAWK, V.ELEPHANT]); |
| 29 | } |
| 30 | |
| 31 | getPpath(b) { |
| 32 | if ([V.HAWK, V.ELEPHANT, V.NOTHING].includes(b[1])) return "Schess/" + b; |
| 33 | return b; |
| 34 | } |
| 35 | |
| 36 | static IsGoodFen(fen) { |
| 37 | if (!ChessRules.IsGoodFen(fen)) return false; |
| 38 | const fenParsed = V.ParseFen(fen); |
| 39 | // Check pocket state |
| 40 | if (!fenParsed.pocket || !fenParsed.pocket.match(/^[0-1]{4,4}$/)) |
| 41 | return false; |
| 42 | return true; |
| 43 | } |
| 44 | |
| 45 | static IsGoodFlags(flags) { |
| 46 | // 4 for castle + 16 for generators |
| 47 | return !!flags.match(/^[a-z]{4,4}[01]{16,16}$/); |
| 48 | } |
| 49 | |
| 50 | setFlags(fenflags) { |
| 51 | super.setFlags(fenflags); //castleFlags |
| 52 | this.pieceFlags = { |
| 53 | w: [...Array(8)], //pieces can generate Hawk or Elephant? |
| 54 | b: [...Array(8)] |
| 55 | }; |
| 56 | const flags = fenflags.substr(4); //skip first 4 letters, for castle |
| 57 | for (let c of ["w", "b"]) { |
| 58 | for (let i = 0; i < 8; i++) |
| 59 | this.pieceFlags[c][i] = flags.charAt((c == "w" ? 0 : 8) + i) == "1"; |
| 60 | } |
| 61 | } |
| 62 | |
| 63 | aggregateFlags() { |
| 64 | return [this.castleFlags, this.pieceFlags]; |
| 65 | } |
| 66 | |
| 67 | disaggregateFlags(flags) { |
| 68 | this.castleFlags = flags[0]; |
| 69 | this.pieceFlags = flags[1]; |
| 70 | } |
| 71 | |
| 72 | static ParseFen(fen) { |
| 73 | const fenParts = fen.split(" "); |
| 74 | return Object.assign( |
| 75 | ChessRules.ParseFen(fen), |
| 76 | { pocket: fenParts[5] } |
| 77 | ); |
| 78 | } |
| 79 | |
| 80 | static GenRandInitFen(randomness) { |
| 81 | return ( |
| 82 | ChessRules.GenRandInitFen(randomness).slice(0, -2) + |
| 83 | // Add pieceFlags + pocket |
| 84 | "1111111111111111 - 1111" |
| 85 | ); |
| 86 | } |
| 87 | |
| 88 | getFen() { |
| 89 | return ( |
| 90 | super.getFen() + " " + |
| 91 | this.getPocketFen() |
| 92 | ); |
| 93 | } |
| 94 | |
| 95 | getFenForRepeat() { |
| 96 | return ( |
| 97 | super.getFenForRepeat() + "_" + |
| 98 | this.getPocketFen() |
| 99 | ); |
| 100 | } |
| 101 | |
| 102 | getFlagsFen() { |
| 103 | let fen = super.getFlagsFen(); |
| 104 | // Add pieces flags |
| 105 | for (let c of ["w", "b"]) |
| 106 | for (let i = 0; i < 8; i++) fen += (this.pieceFlags[c][i] ? "1" : "0"); |
| 107 | return fen; |
| 108 | } |
| 109 | |
| 110 | getPocketFen() { |
| 111 | let res = ""; |
| 112 | for (let c of ["w", "b"]) |
| 113 | res += this.pocket[c][V.HAWK] + this.pocket[c][V.ELEPHANT]; |
| 114 | return res; |
| 115 | } |
| 116 | |
| 117 | setOtherVariables(fen) { |
| 118 | super.setOtherVariables(fen); |
| 119 | const fenParsed = V.ParseFen(fen); |
| 120 | this.pocket = { |
| 121 | "w": { |
| 122 | h: parseInt(fenParsed.pocket[0], 10), |
| 123 | e: parseInt(fenParsed.pocket[1], 10) |
| 124 | }, |
| 125 | "b": { |
| 126 | h: parseInt(fenParsed.pocket[2], 10), |
| 127 | e: parseInt(fenParsed.pocket[3], 10) |
| 128 | } |
| 129 | }; |
| 130 | } |
| 131 | |
| 132 | getPotentialMovesFrom([x, y]) { |
| 133 | let moves = undefined; |
| 134 | switch (this.getPiece(x, y)) { |
| 135 | case V.HAWK: |
| 136 | moves = this.getPotentialHawkMoves([x, y]); |
| 137 | break; |
| 138 | case V.ELEPHANT: |
| 139 | moves = this.getPotentialElephantMoves([x, y]); |
| 140 | break; |
| 141 | default: |
| 142 | moves = super.getPotentialMovesFrom([x, y]); |
| 143 | } |
| 144 | // For moves presentation when choices: |
| 145 | const unshiftNothing = (m) => { |
| 146 | const a = m.appear[0]; |
| 147 | m.appear.unshift(new PiPo({ |
| 148 | p: V.NOTHING, |
| 149 | c: 'o', |
| 150 | x: a.x, |
| 151 | y: a.y |
| 152 | })); |
| 153 | }; |
| 154 | // Post-processing: add choices for hawk and elephant, |
| 155 | // except for moves letting the king under check. |
| 156 | const color = this.turn; |
| 157 | if (Object.values(this.pocket[color]).some(v => v > 0)) { |
| 158 | const firstRank = (color == "w" ? 7 : 0); |
| 159 | let validMoves = []; |
| 160 | moves.forEach(m => { |
| 161 | let inCheckAfter = false; |
| 162 | this.play(m); |
| 163 | if (this.underCheck(color)) inCheckAfter = true; |
| 164 | this.undo(m); |
| 165 | if (!inCheckAfter) { |
| 166 | for (let pp of ['h', 'e']) { |
| 167 | if (this.pocket[color][pp] > 0) { |
| 168 | let shift = (m.appear[0].p == V.NOTHING ? 1 : 0); |
| 169 | if ( |
| 170 | m.start.x == firstRank && |
| 171 | this.pieceFlags[color][m.start.y] && |
| 172 | ( |
| 173 | m.appear.length == shift+1 || |
| 174 | // Special castle case: is initial king square free? |
| 175 | ![m.appear[shift].y, m.appear[shift+1].y] |
| 176 | .includes(m.vanish[0].y) |
| 177 | ) |
| 178 | ) { |
| 179 | let pMove = JSON.parse(JSON.stringify(m)); |
| 180 | if (shift == 1) pMove.appear.shift(); |
| 181 | // NOTE: unshift instead of push, for choices presentation |
| 182 | pMove.appear.unshift(new PiPo({ |
| 183 | p: pp, |
| 184 | c: color, |
| 185 | x: x, |
| 186 | y: y |
| 187 | })); |
| 188 | validMoves.push(pMove); |
| 189 | if (shift == 0) unshiftNothing(m); |
| 190 | } |
| 191 | shift = (m.appear[0].p == V.NOTHING ? 1 : 0); |
| 192 | if ( |
| 193 | m.appear.length >= 2 + shift && |
| 194 | m.vanish.length == 2 && |
| 195 | ![m.appear[shift].y, m.appear[shift+1].y] |
| 196 | .includes(m.vanish[1].y) |
| 197 | ) { |
| 198 | // Special castle case: rook flag was necessarily on |
| 199 | let pMove = JSON.parse(JSON.stringify(m)); |
| 200 | if (shift == 1) pMove.appear.shift(); |
| 201 | pMove.appear.unshift(new PiPo({ |
| 202 | p: pp, |
| 203 | c: color, |
| 204 | x: m.vanish[1].x, |
| 205 | y: m.vanish[1].y |
| 206 | })); |
| 207 | validMoves.push(pMove); |
| 208 | if (shift == 0) unshiftNothing(m); |
| 209 | } |
| 210 | } |
| 211 | } |
| 212 | // Unshift, to show the empty square on the left: |
| 213 | validMoves.unshift(m); |
| 214 | } |
| 215 | }); |
| 216 | moves = validMoves; |
| 217 | } |
| 218 | return moves; |
| 219 | } |
| 220 | |
| 221 | getPotentialHawkMoves(sq) { |
| 222 | return this.getSlideNJumpMoves(sq, V.steps[V.BISHOP]).concat( |
| 223 | this.getSlideNJumpMoves(sq, V.steps[V.KNIGHT], "oneStep") |
| 224 | ); |
| 225 | } |
| 226 | |
| 227 | getPotentialElephantMoves(sq) { |
| 228 | return this.getSlideNJumpMoves(sq, V.steps[V.ROOK]).concat( |
| 229 | this.getSlideNJumpMoves(sq, V.steps[V.KNIGHT], "oneStep") |
| 230 | ); |
| 231 | } |
| 232 | |
| 233 | isAttacked(sq, color) { |
| 234 | return ( |
| 235 | super.isAttacked(sq, color) || |
| 236 | this.isAttackedByHawk(sq, color) || |
| 237 | this.isAttackedByElephant(sq, color) |
| 238 | ); |
| 239 | } |
| 240 | |
| 241 | isAttackedByHawk(sq, color) { |
| 242 | return ( |
| 243 | this.isAttackedBySlideNJump(sq, color, V.HAWK, V.steps[V.BISHOP]) || |
| 244 | this.isAttackedBySlideNJump( |
| 245 | sq, |
| 246 | color, |
| 247 | V.HAWK, |
| 248 | V.steps[V.KNIGHT], |
| 249 | "oneStep" |
| 250 | ) |
| 251 | ); |
| 252 | } |
| 253 | |
| 254 | isAttackedByElephant(sq, color) { |
| 255 | return ( |
| 256 | this.isAttackedBySlideNJump(sq, color, V.ELEPHANT, V.steps[V.ROOK]) || |
| 257 | this.isAttackedBySlideNJump( |
| 258 | sq, |
| 259 | color, |
| 260 | V.ELEPHANT, |
| 261 | V.steps[V.KNIGHT], |
| 262 | "oneStep" |
| 263 | ) |
| 264 | ); |
| 265 | } |
| 266 | |
| 267 | filterValid(moves) { |
| 268 | if (Object.values(this.pocket[this.turn]).some(v => v > 0)) |
| 269 | // Undercheck tests done in getPotentialMovesFrom() |
| 270 | return moves; |
| 271 | return super.filterValid(moves); |
| 272 | } |
| 273 | |
| 274 | prePlay(move) { |
| 275 | super.prePlay(move); |
| 276 | if (move.appear.length >= 2) { |
| 277 | if ([V.HAWK, V.ELEPHANT].includes(move.appear[0].p)) { |
| 278 | // A pocket piece is used |
| 279 | const color = this.turn; |
| 280 | this.pocket[color][move.appear[0].p] = 0; |
| 281 | } |
| 282 | } |
| 283 | } |
| 284 | |
| 285 | postPlay(move) { |
| 286 | const color = move.vanish[0].c; |
| 287 | const piece = move.vanish[0].p; |
| 288 | // Update king position + flags |
| 289 | if (piece == V.KING) { |
| 290 | const shift = |
| 291 | ([V.HAWK, V.ELEPHANT, V.NOTHING].includes(move.appear[0].p) ? 1 : 0); |
| 292 | this.kingPos[color][0] = move.appear[shift].x; |
| 293 | this.kingPos[color][1] = move.appear[shift].y; |
| 294 | } |
| 295 | this.updateCastleFlags(move, piece); |
| 296 | |
| 297 | const oppCol = this.turn; |
| 298 | const firstRank = (color == 'w' ? 7 : 0); |
| 299 | const oppFirstRank = 7 - firstRank; |
| 300 | // Does this move turn off a piece init square flag? |
| 301 | if (move.start.x == firstRank) { |
| 302 | if (this.pieceFlags[color][move.start.y]) |
| 303 | this.pieceFlags[color][move.start.y] = false; |
| 304 | // Special castle case: |
| 305 | if (move.appear.length >= 2 && move.vanish.length == 2) { |
| 306 | const L = move.appear.length; |
| 307 | if (move.appear[L-1].p == V.ROOK) |
| 308 | this.pieceFlags[color][move.vanish[1].y] = false; |
| 309 | } |
| 310 | } |
| 311 | if (move.end.x == oppFirstRank && this.pieceFlags[oppCol][move.end.y]) |
| 312 | this.pieceFlags[oppCol][move.end.y] = false; |
| 313 | } |
| 314 | |
| 315 | postUndo(move) { |
| 316 | super.postUndo(move); |
| 317 | if (move.appear.length >= 2) { |
| 318 | if ([V.HAWK, V.ELEPHANT].includes(move.appear[0].p)) { |
| 319 | // A pocket piece was used |
| 320 | const color = this.turn; |
| 321 | this.pocket[color][move.appear[0].p] = 1; |
| 322 | } |
| 323 | } |
| 324 | } |
| 325 | |
| 326 | static get SEARCH_DEPTH() { |
| 327 | return 2; |
| 328 | } |
| 329 | |
| 330 | static get VALUES() { |
| 331 | return Object.assign( |
| 332 | {}, |
| 333 | ChessRules.VALUES, |
| 334 | { 'h': 5, 'e': 7 } |
| 335 | ); |
| 336 | } |
| 337 | |
| 338 | getNotation(move) { |
| 339 | if (move.appear.length >= 2) { |
| 340 | const pPieceAppear = [V.HAWK, V.ELEPHANT].includes(move.appear[0].p); |
| 341 | const nothingAppear = (move.appear[0].p == V.NOTHING); |
| 342 | if (pPieceAppear || nothingAppear) { |
| 343 | let suffix = ""; |
| 344 | if (pPieceAppear) suffix = "/" + move.appear[0].p.toUpperCase(); |
| 345 | let cmove = JSON.parse(JSON.stringify(move)); |
| 346 | cmove.appear.shift(); |
| 347 | return super.getNotation(cmove) + suffix; |
| 348 | } |
| 349 | } |
| 350 | return super.getNotation(move); |
| 351 | } |
| 352 | }; |