--- /dev/null
+import { ChessRules, PiPo, Move } from "@/base_rules";
+import { ArrayFun } from "@/utils/array";
+
+export const VariantRules = class RecycleRules extends ChessRules {
+ static IsGoodFen(fen) {
+ if (!ChessRules.IsGoodFen(fen)) return false;
+ const fenParsed = V.ParseFen(fen);
+ // 5) Check reserves
+ if (!fenParsed.reserve || !fenParsed.reserve.match(/^[0-9]{10,10}$/))
+ return false;
+ return true;
+ }
+
+ static ParseFen(fen) {
+ const fenParts = fen.split(" ");
+ return Object.assign(ChessRules.ParseFen(fen), {
+ reserve: fenParts[5],
+ });
+ }
+
+ static GenRandInitFen() {
+ return ChessRules.GenRandInitFen() + " 0000000000";
+ }
+
+ getFen() {
+ return (
+ super.getFen() + " " + this.getReserveFen()
+ );
+ }
+
+ getReserveFen() {
+ let counts = new Array(10);
+ for (
+ let i = 0;
+ i < V.PIECES.length - 1;
+ i++ //-1: no king reserve
+ ) {
+ counts[i] = this.reserve["w"][V.PIECES[i]];
+ counts[5 + i] = this.reserve["b"][V.PIECES[i]];
+ }
+ return counts.join("");
+ }
+
+ setOtherVariables(fen) {
+ super.setOtherVariables(fen);
+ const fenParsed = V.ParseFen(fen);
+ // Also init reserves (used by the interface to show landable pieces)
+ this.reserve = {
+ w: {
+ [V.PAWN]: parseInt(fenParsed.reserve[0]),
+ [V.ROOK]: parseInt(fenParsed.reserve[1]),
+ [V.KNIGHT]: parseInt(fenParsed.reserve[2]),
+ [V.BISHOP]: parseInt(fenParsed.reserve[3]),
+ [V.QUEEN]: parseInt(fenParsed.reserve[4])
+ },
+ b: {
+ [V.PAWN]: parseInt(fenParsed.reserve[5]),
+ [V.ROOK]: parseInt(fenParsed.reserve[6]),
+ [V.KNIGHT]: parseInt(fenParsed.reserve[7]),
+ [V.BISHOP]: parseInt(fenParsed.reserve[8]),
+ [V.QUEEN]: parseInt(fenParsed.reserve[9])
+ }
+ };
+ }
+
+ getColor(i, j) {
+ if (i >= V.size.x) return i == V.size.x ? "w" : "b";
+ return this.board[i][j].charAt(0);
+ }
+
+ getPiece(i, j) {
+ if (i >= V.size.x) return V.RESERVE_PIECES[j];
+ return this.board[i][j].charAt(1);
+ }
+
+ // Used by the interface:
+ getReservePpath(color, index) {
+ return color + V.RESERVE_PIECES[index];
+ }
+
+ // Ordering on reserve pieces
+ static get RESERVE_PIECES() {
+ return [V.PAWN, V.ROOK, V.KNIGHT, V.BISHOP, V.QUEEN];
+ }
+
+ getReserveMoves([x, y]) {
+ const color = this.turn;
+ const p = V.RESERVE_PIECES[y];
+ if (this.reserve[color][p] == 0) return [];
+ let moves = [];
+ const pawnShift = p == V.PAWN ? 1 : 0;
+ for (let i = pawnShift; i < V.size.x - pawnShift; i++) {
+ for (let j = 0; j < V.size.y; j++) {
+ if (this.board[i][j] == V.EMPTY) {
+ let mv = new Move({
+ appear: [
+ new PiPo({
+ x: i,
+ y: j,
+ c: color,
+ p: p
+ })
+ ],
+ vanish: [],
+ start: { x: x, y: y }, //a bit artificial...
+ end: { x: i, y: j }
+ });
+ moves.push(mv);
+ }
+ }
+ }
+ return moves;
+ }
+
+ getPotentialMovesFrom([x, y]) {
+ if (x >= V.size.x) {
+ // Reserves, outside of board: x == sizeX(+1)
+ return this.getReserveMoves([x, y]);
+ }
+ // Standard moves
+ return super.getPotentialMovesFrom([x, y]);
+ }
+
+ getPotentialPawnMoves([x, y]) {
+ const color = this.turn;
+ let moves = [];
+ const [sizeX, sizeY] = [V.size.x, V.size.y];
+ const shiftX = color == "w" ? -1 : 1;
+ const startRank = color == "w" ? sizeX - 2 : 1;
+ const lastRank = color == "w" ? 0 : sizeX - 1;
+
+ // One square forward
+ if (this.board[x + shiftX][y] == V.EMPTY) {
+ moves.push(
+ this.getBasicMove([x, y], [x + shiftX, y])
+ );
+ // Next condition because pawns on 1st rank can generally jump
+ if (
+ x == startRank &&
+ this.board[x + 2 * shiftX][y] == V.EMPTY
+ ) {
+ // Two squares jump
+ moves.push(this.getBasicMove([x, y], [x + 2 * shiftX, y]));
+ }
+ }
+ // Captures
+ for (let shiftY of [-1, 1]) {
+ if (
+ y + shiftY >= 0 &&
+ y + shiftY < sizeY &&
+ this.board[x + shiftX][y + shiftY] != V.EMPTY &&
+ this.canTake([x, y], [x + shiftX, y + shiftY])
+ ) {
+ moves.push(
+ this.getBasicMove([x, y], [x + shiftX, y + shiftY])
+ );
+ }
+ }
+
+ // En passant
+ const Lep = this.epSquares.length;
+ const epSquare = this.epSquares[Lep - 1]; //always at least one element
+ if (
+ !!epSquare &&
+ epSquare.x == x + shiftX &&
+ Math.abs(epSquare.y - y) == 1
+ ) {
+ let enpassantMove = this.getBasicMove([x, y], [epSquare.x, epSquare.y]);
+ enpassantMove.vanish.push({
+ x: x,
+ y: epSquare.y,
+ p: "p",
+ c: this.getColor(x, epSquare.y)
+ });
+ moves.push(enpassantMove);
+ }
+
+ // Post-processing: remove falling pawns
+ if (x + shiftX == lastRank) {
+ moves.forEach(m => {
+ m.appear.pop();
+ });
+ }
+
+ return moves;
+ }
+
+ getAllValidMoves() {
+ let moves = super.getAllValidMoves();
+ const color = this.turn;
+ for (let i = 0; i < V.RESERVE_PIECES.length; i++)
+ moves = moves.concat(
+ this.getReserveMoves([V.size.x + (color == "w" ? 0 : 1), i])
+ );
+ return this.filterValid(moves);
+ }
+
+ atLeastOneMove() {
+ if (!super.atLeastOneMove()) {
+ // Search one reserve move
+ for (let i = 0; i < V.RESERVE_PIECES.length; i++) {
+ let moves = this.filterValid(
+ this.getReserveMoves([V.size.x + (this.turn == "w" ? 0 : 1), i])
+ );
+ if (moves.length > 0) return true;
+ }
+ return false;
+ }
+ return true;
+ }
+
+ canTake([x1, y1], [x2, y2]) {
+ // Self-captures allowed, except for the king:
+ return this.getPiece(x2, y2) != V.KING;
+ }
+
+ updateVariables(move) {
+ super.updateVariables(move);
+ if (move.vanish.length == 2 && move.appear.length == 2) return; //skip castle
+ const color = V.GetOppCol(this.turn);
+ if (move.vanish.length == 0) {
+ this.reserve[color][move.appear[0].p]--;
+ return;
+ }
+ else if (move.vanish.length == 2 && move.vanish[1].c == color) {
+ // Self-capture
+ this.reserve[color][move.vanish[1].p]++;
+ }
+ }
+
+ unupdateVariables(move) {
+ super.unupdateVariables(move);
+ if (move.vanish.length == 2 && move.appear.length == 2) return;
+ const color = this.turn;
+ if (move.vanish.length == 0) {
+ this.reserve[color][move.appear[0].p]++;
+ return;
+ }
+ else if (move.vanish.length == 2 && move.vanish[1].c == color) {
+ this.reserve[color][move.vanish[1].p]--;
+ }
+ }
+
+ static get SEARCH_DEPTH() {
+ return 2;
+ }
+
+ evalPosition() {
+ let evaluation = super.evalPosition();
+ // Add reserves:
+ for (let i = 0; i < V.RESERVE_PIECES.length; i++) {
+ const p = V.RESERVE_PIECES[i];
+ evaluation += this.reserve["w"][p] * V.VALUES[p];
+ evaluation -= this.reserve["b"][p] * V.VALUES[p];
+ }
+ return evaluation;
+ }
+
+ getNotation(move) {
+ const finalSquare = V.CoordsToSquare(move.end);
+ if (move.vanish.length > 0) {
+ if (move.appear.length > 0) {
+ // Standard move
+ return super.getNotation(move);
+ } else {
+ // Pawn fallen: capturing or not
+ let res = "";
+ if (move.vanish.length == 2)
+ res += V.CoordToColumn(move.start.y) + "x";
+ return res + finalSquare;
+ }
+ }
+ // Rebirth:
+ const piece =
+ move.appear[0].p != V.PAWN ? move.appear[0].p.toUpperCase() : "";
+ return piece + "@" + V.CoordsToSquare(move.end);
+ }
+};
projects / vchess.git / blobdiff