chess-legal-moves/dist/createNewGameState/parseBoard.js

Analyses a given chess game position in Fen notation to return legal moves and provides the next game position after a given move

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.convertNumbersToPoints = exports.getRankCells = exports.getRanks = exports.parseBoard = void 0;
/**
 * Parses a string representing the chess board an array of 64 strings
 * @param boardString - a string representing the board as the first part of FEN notation
 * @returns an array of 64 strings representing the pieces and empty squares
 *
 * @internal
 */
function parseBoard(boardString) {
    var boardCells = [];
    var rankList = getRanks(boardString);
    for (var i = rankList.length - 1; i >= 0; i--) {
        boardCells.push.apply(boardCells, getRankCells(rankList[i]));
    }
    return boardCells;
}
exports.parseBoard = parseBoard;
/**
 * Splits a board represented as a string into 8 strings representing the chessboard ranks
 * @param boardString - a string representing the board as the first part of FEN notation
 * @returns an array of 8 strings representing the chessboard ranks
 *
 * @internal
 */
function getRanks(boardString) {
    return boardString.split('/');
}
exports.getRanks = getRanks;
/**
 * Splits a chessboard rank represented as a string into an array of 8 characters reprenting the pieces and empty squares
 * @param rank - a string representing one of the chessboard ranks
 * @returns an array of 8 characters reprenting the pieces and empty squares
 *
 * @internal
 */
function getRankCells(rank) {
    rank = convertNumbersToPoints(rank);
    return rank.split('');
}
exports.getRankCells = getRankCells;
/**
 * Converts a chessboard rank represented as a string possibly containing numbers to represent the number of consecutive empty squares
 * into a rank containing points to represent each empty square
 * @param rank - a string representing one of the chessboard ranks
 * @returns a rank with dots to represent empty squares
 *
 * @internal
 */
function convertNumbersToPoints(rank) {
    for (var i = 1; i <= 8; i++) {
        rank = rank.replaceAll(i.toString(), '.'.repeat(i));
    }
    return rank;
}
exports.convertNumbersToPoints = convertNumbersToPoints;