MinesweeperGame.prototype._openNearCells = function(x, y) {
    var minesCounter = this.countNearMines(x, y);
    if (minesCounter != 0) {
        return false;
    }
    var nearCellList = this._getNearCells(x, y);
    for (var nearCellY in nearCellList) {
        if (!nearCellList.hasOwnProperty(nearCellY)) continue;
        for (var nearCellX in nearCellList[nearCellY]) {
            if (!nearCellList[nearCellY].hasOwnProperty(nearCellX)) continue;
            if (!this.hasOpened(nearCellX, nearCellY) &&
                !this.hasFlag(nearCellX,   nearCellY)) {
                this.open(nearCellX, nearCellY);
            }
        }
    }
};
 
MinesweeperGame.prototype._isCellInDict = function(x, y, dict) {
    if (dict[y]) {
        return dict[y][x];
    }
    return false;
};
 
MinesweeperGame.prototype._addCellToDict = function(x, y, dict) {
    if (!this._isCorrectCell(x, y)) {
        throw new MinesweeperGameException("При добавлении превышены размеры поля.");
    }
    if (this._isCellInDict(x, y, dict)) {
        throw new MinesweeperGameException("Клетка уже существует в словаре.");
    }
    dict[y][x] = true;
    return dict;
};
 
MinesweeperGame.prototype._isCorrectCell = function(x, y) {
    if (x < 1           ||
        y < 1           ||
        x > this._width ||
        y > this._height) {
        return false;
    }
    return true;
};

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