/// <summary>
        /// 重新构造二叉树
        /// </summary>
        /// <param name="strExpression">表达式</param>
        public void ChangeExpression(string strExpression)
        {
            _Expression = strExpression;

            _Tree              = null;
            _Position          = 0;
            _Identifiers       = null;
            _CurrentIdentifier = null;
            _ParentIdentifier  = null;

            if (strExpression != string.Empty)
            {
                try
                {
                    _ExpressionChars = new Char[strExpression.Length + 1];

                    strExpression.CopyTo(0, _ExpressionChars, 0, strExpression.Length);
                    _ExpressionChars[strExpression.Length] = '\0';

                    _Tree = DoExpression();

                    if (_ExpressionChars[_Position] != '\0')
                    {
                        throw ParsingException.NewParsingException(Parse_Error.peSyntaxError, _Position);
                    }
                }
                finally
                {
                    _CurrentIdentifier = null;
                    _ParentIdentifier  = null;
                }
            }
        }
        //私有方法

        /// <summary>
        /// 顺序输出标识符
        /// </summary>
        /// <param name="oID"></param>
        /// <param name="strID"></param>
        /// <param name="nPos"></param>
        private void OutputID(Operation_IDs oID, string strID, int nPos)
        {
            if (OutputIdentifiers)
            {
                ParseIdentifier pi = new ParseIdentifier(oID, strID, nPos, _CurrentIdentifier);

                if (_CurrentIdentifier == null)
                {
                    if (_ParentIdentifier == null)
                    {
                        _Identifiers = pi;
                    }
                    else
                    {
                        _ParentIdentifier._SubIdentifier = pi;
                    }
                }
                else
                {
                    _CurrentIdentifier._NextIdentifier = pi;
                }

                pi._ParentIdentifier = _ParentIdentifier;
                _CurrentIdentifier   = pi;
            }
        }
Ejemplo n.º 3
0
 public ParseIdentifier(Operation_IDs oID, string strID, int nPos, ParseIdentifier prev)
 {
     _OperationID    = oID;
     _Identifier     = strID;
     _Position       = nPos;
     _PrevIdentifier = prev;
 }
 private void OutputIDToParentLevel()
 {
     if (_ParentIdentifier != null)
     {
         _CurrentIdentifier = _ParentIdentifier;
         _ParentIdentifier  = _ParentIdentifier._ParentIdentifier;
     }
 }
 private void OutputIDToSubLevel()
 {
     _ParentIdentifier  = _CurrentIdentifier;
     _CurrentIdentifier = null;
 }