@mychess/openings/eco.js

Chess openings.

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
var fen_1 = require("./fen");
var ECO = /** @class */ (function () {
    function ECO(pgn) {
        this.fen = new fen_1.Fen(pgn.trim().replace(/\r?\n|\r/g, ' '));
    }
    ECO.prototype.opening = function () {
        var openings = this.fen.getOpenings();
        var hits = [];
        if (!openings.length)
            return null;
        if (openings.length == 1)
            return openings[0];
        for (var i = 0; i < openings.length; i++) {
            var opening = openings[i];
            var hit = { hits: 0, opening: opening };
            var fen = new fen_1.Fen(opening.pgn);
            var opening_moves = fen.getMoves(false);
            var game_moves = this.fen.getMoves(false).slice(0, opening_moves.length);
            if (opening_moves.length > this.fen.getMoves().length)
                continue;
            for (var i2 = 0; i2 < opening_moves.length; i2++) {
                var move = opening_moves[i2];
                if (game_moves.indexOf(move) !== -1) {
                    hit.hits++;
                }
            }
            hits.push(hit);
        }
        var closest = this.closestOpening(hits);
        return typeof closest != 'undefined' && closest !== null ? closest.opening : null;
    };
    ECO.prototype.closestOpening = function (openings) {
        var closest = 0;
        for (var i = 0; i < openings.length; i++) {
            if (openings[i].hits >= closest) {
                closest = openings[i].hits;
            }
        }
        return openings.find(function (e) { return e.hits == closest; });
    };
    return ECO;
}());
exports.ECO = ECO;