/// <summary>
        /// 为预测分析表设置表项
        /// </summary>
        /// <param name="nEnum">产生式左侧非终结符号</param>
        /// <param name="tokenTypes">所有需要被设置表项的终结符号</param>
        /// <param name="treeNodes">构成产生式的语法分析树结点</param>
        public void SetParsingTable(NEnum nEnum, List <ParseTreeNode> treeNodes
                                    , params TerminalType[] tokenTypes)
        {
            ParsingTableItem tableItem; // 用于接收新建的预测分析表表项

            foreach (TerminalType tEnum in tokenTypes)
            {
                // 将树结点添加到产生式中
                tableItem = new ParsingTableItem();
                tableItem.production.AddRange(treeNodes);

                this.GetItem(nEnum, tEnum).Add(tableItem);
            }
        }
        /// <summary>
        /// 为预测分析表设置表项(产生式中由一个非终结符号构成)
        /// </summary>
        /// <param name="nEnum">产生式左侧非终结符号</param>
        /// <param name="production">构成产生式的非终结符号</param>
        /// <param name="tokenTypes">所有需要被设置表项的终结符号</param>
        public void SetParsingTable(NEnum nEnum, NEnum production,
                                    params TerminalType[] tokenTypes)
        {
            ParsingTableItem tableItem; // 用于接收新建的预测分析表表项
            ParseTreeNode    treeNode;  // 用于接收新建的语法分析树结点

            foreach (TerminalType tEnum in tokenTypes)
            {
                // 将树结点添加到产生式中
                tableItem = new ParsingTableItem();
                treeNode  = new ParseTreeNode(false, TerminalType.DEFAULT, production);
                tableItem.production.Add(treeNode);

                this.GetItem(nEnum, tEnum).Add(tableItem);
            }
        }