+import { ChessRules, PiPo } from "@/base_rules";
+
+export class SchessRules extends ChessRules {
+ static get PawnSpecs() {
+ return Object.assign(
+ {},
+ ChessRules.PawnSpecs,
+ {
+ promotions:
+ ChessRules.PawnSpecs.promotions.concat([V.HAWK, V.ELEPHANT])
+ }
+ );
+ }
+
+ static get HAWK() {
+ return 'h';
+ }
+
+ static get ELEPHANT() {
+ return 'e';
+ }
+
+ static get PIECES() {
+ return ChessRules.PIECES.concat([V.HAWK, V.ELEPHANT]);
+ }
+
+ getPpath(b) {
+ if ([V.HAWK, V.ELEPHANT].includes(b[1])) return "Schess/" + b;
+ return b;
+ }
+
+ // TODO: maybe changes could be done to this method to show "empty"
+ // instead of a piece to not use a pocket piece...
+// getPPpath(b) { }
+
+ static IsGoodFen(fen) {
+ if (!ChessRules.IsGoodFen(fen)) return false;
+ const fenParsed = V.ParseFen(fen);
+ // Check pocket state
+ if (!fenParsed.pocket || !fenParsed.pocket.match(/^[0-1]{4,4}$/))
+ return false;
+ return true;
+ }
+
+ static IsGoodFlags(flags) {
+ // 4 for castle + 16 for generators
+ return !!flags.match(/^[a-z]{4,4}[01]{16,16}$/);
+ }
+
+ setFlags(fenflags) {
+ super.setFlags(fenflags); //castleFlags
+ this.pieceFlags = {
+ w: [...Array(8)], //pawns can move 2 squares?
+ b: [...Array(8)]
+ };
+ const flags = fenflags.substr(4); //skip first 4 letters, for castle
+ for (let c of ["w", "b"]) {
+ for (let i = 0; i < 8; i++)
+ this.pieceFlags[c][i] = flags.charAt((c == "w" ? 0 : 8) + i) == "1";
+ }
+ }
+
+ aggregateFlags() {
+ return [this.castleFlags, this.pieceFlags];
+ }
+
+ disaggregateFlags(flags) {
+ this.castleFlags = flags[0];
+ this.pieceFlags = flags[1];
+ }
+
+ static ParseFen(fen) {
+ const fenParts = fen.split(" ");
+ return Object.assign(
+ ChessRules.ParseFen(fen),
+ { pocket: fenParts[5] }
+ );
+ }
+
+ static GenRandInitFen(randomness) {
+ return (
+ ChessRules.GenRandInitFen(randomness).slice(0, -2) +
+ // Add pieceFlags + pocket
+ "1111111111111111 - 1111"
+ );
+ }
+
+ getFen() {
+ return (
+ super.getFen() + " " +
+ this.getPocketFen()
+ );
+ }
+
+ getFenForRepeat() {
+ return (
+ super.getFenForRepeat() + "_" +
+ this.getPocketFen()
+ );
+ }
+
+ getFlagsFen() {
+ let fen = super.getFlagsFen();
+ // Add pieces flags
+ for (let c of ["w", "b"])
+ for (let i = 0; i < 8; i++) fen += (this.pieceFlags[c][i] ? "1" : "0");
+ return fen;
+ }
+
+ getPocketFen() {
+ let res = "";
+ for (let c of ["w", "b"])
+ res += this.pocket[c][V.HAWK] + this.pocket[c][V.ELEPHANT];
+ return res;
+ }
+
+ setOtherVariables(fen) {
+ super.setOtherVariables(fen);
+ const fenParsed = V.ParseFen(fen);
+ this.pocket = {
+ "w": {
+ h: parseInt(fenParsed.pocket[0]),
+ e: parseInt(fenParsed.pocket[1])
+ },
+ "b": {
+ h: parseInt(fenParsed.pocket[2]),
+ e: parseInt(fenParsed.pocket[3])
+ }
+ };
+ }
+
+ getPotentialMovesFrom([x, y]) {
+ let moves = undefined;
+ switch (this.getPiece(x, y)) {
+ case V.HAWK:
+ moves = this.getPotentialHawkMoves([x, y]);
+ break;
+ case V.ELEPHANT:
+ moves = this.getPotentialElephantMoves([x, y]);
+ break;
+ default:
+ moves = super.getPotentialMovesFrom([x, y]);
+ }
+ // Post-processing: add choices for hawk and elephant,
+ // except for moves letting the king under check.
+ const color = this.turn;
+ if (Object.values(this.pocket[color]).some(v => v > 0)) {
+ const firstRank = (color == "w" ? 7 : 0);
+ let pocketMoves = [];
+ moves.forEach(m => {
+ let inCheckAfter = false;
+ this.play(m);
+ if (this.underCheck(color)) inCheckAfter = true;
+ this.undo(m);
+ if (!inCheckAfter) {
+ for (let pp of ['h', 'e']) {
+ if (this.pocket[color][pp] > 0) {
+ if (
+ m.start.x == firstRank &&
+ this.pieceFlags[color][m.start.y] &&
+ (
+ m.appear.length == 1 ||
+ // Special castle case: is initial king square free?
+ ![m.appear[0].y, m.appear[1].y].includes(m.vanish[0].y)
+ )
+ ) {
+ let pMove = JSON.parse(JSON.stringify(m));
+ // NOTE: unshift instead of push, for choices presentation
+ pMove.appear.unshift(new PiPo({
+ p: pp,
+ c: color,
+ x: x,
+ y: y
+ }));
+ pocketMoves.push(pMove);
+ }
+ if (
+ m.appear.length == 2 &&
+ ![m.appear[0].y, m.appear[1].y].includes(m.vanish[1].y)
+ ) {
+ // Special castle case: rook flag was necessarily on
+ let pMove = JSON.parse(JSON.stringify(m));
+ pMove.appear.unshift(new PiPo({
+ p: pp,
+ c: color,
+ x: m.vanish[1].x,
+ y: m.vanish[1].y
+ }));
+ pocketMoves.push(pMove);
+ }
+ }
+ }
+ }
+ });
+ // NOTE: the order matter, for presentation on screen
+ moves = moves.concat(pocketMoves);
+ }
+ return moves;
+ }
+
+ getPotentialHawkMoves(sq) {
+ return this.getSlideNJumpMoves(
+ sq,
+ V.steps[V.BISHOP].concat(V.steps[V.KNIGHT])
+ );
+ }
+
+ getPotentialElephantMoves(sq) {
+ return this.getSlideNJumpMoves(
+ sq,
+ V.steps[V.ROOK].concat(V.steps[V.KNIGHT])
+ );
+ }
+
+ isAttacked(sq, color) {
+ return (
+ super.isAttacked(sq, color) ||
+ this.isAttackedByHawk(sq, color) ||
+ this.isAttackedByElephant(sq, color)
+ );
+ }
+
+ isAttackedByHawk(sq, color) {
+ return this.isAttackedBySlideNJump(
+ sq,
+ color,
+ V.HAWK,
+ V.steps[V.BISHOP].concat(V.steps[V.KNIGHT])
+ );
+ }
+
+ isAttackedByElephant(sq, color) {
+ return this.isAttackedBySlideNJump(
+ sq,
+ color,
+ V.ELEPHANT,
+ V.steps[V.ROOK].concat(V.steps[V.KNIGHT])
+ );
+ }
+
+ prePlay(move) {
+ super.prePlay(move);
+ if (move.appear.length >= 2) {
+ if ([V.HAWK, V.ELEPHANT].includes(move.appear[0].p)) {
+ // A pocket piece is used
+ const color = this.turn;
+ this.pocket[color][move.appear[0].p] = 0;
+ }
+ }
+ }
+
+ postPlay(move) {
+ super.postPlay(move);
+ const color = move.vanish[0].c;
+ const oppCol = V.GetOppCol(color);
+ const firstRank = (color == 'w' ? 7 : 0);
+ const oppFirstRank = 7 - firstRank;
+ // Does this move turn off a piece init square flag?
+ if (move.start.x == firstRank) {
+ if (this.pieceFlags[color][move.start.y])
+ this.pieceFlags[color][move.start.y] = false;
+ // Special castle case:
+ if (move.appear.length >= 2) {
+ const L = move.appear.length;
+ if (move.appear[L-1].p == V.ROOK)
+ this.pieceFlags[color][move.vanish[1].y] = false;
+ }
+ }
+ if (move.end.x == oppFirstRank && this.pieceFlags[oppCol][move.end.y])
+ this.pieceFlags[oppCol][move.end.y] = false;
+ }
+
+ postUndo(move) {
+ super.postUndo(move);
+ if (move.appear.length >= 2) {
+ if ([V.HAWK, V.ELEPHANT].includes(move.appear[0].p)) {
+ // A pocket piece was used
+ const color = this.turn;
+ this.pocket[color][move.appear[0].p] = 1;
+ }
+ }
+ }
+
+ static get SEARCH_DEPTH() {
+ return 2;
+ }
+
+ static get VALUES() {
+ return Object.assign(
+ {},
+ ChessRules.VALUES,
+ { 'h': 5, 'e': 7 }
+ );
+ }
+
+ getNotation(move) {
+ if (
+ move.appear.length >= 2 &&
+ [V.HAWK, V.ELEPHANT].includes(move.appear[0].p)
+ ) {
+ const suffix = "/" + move.appear[0].p.toUpperCase();
+ let cmove = JSON.parse(JSON.stringify(move));
+ cmove.appear.shift();
+ return super.getNotation(cmove) + suffix;
+ }
+ return super.getNotation(move);
+ }
+};
projects / vchess.git / commitdiff
