示例#1
0
        public Boolean IsValid(String strExp, ref String strRetMsg)
        {
            Boolean           bRet   = true;
            calcExprLexer     lex    = new calcExprLexer(new AntlrInputStream("=" + strExp));
            CommonTokenStream tokens = new CommonTokenStream(lex);
            calcExprParser    parser = new calcExprParser(tokens);

            IParseTree tree = null;

            try
            {
                tree = parser.parse();

                if (parser.NumberOfSyntaxErrors > 0)
                {
                    bRet      = false;
                    strRetMsg = "公式:" + "'" + strExp + "'有语法错误,请查看帮助中公式的语法要求";
                }
            }
            catch (RecognitionException ex)
            {
                bRet      = false;
                strRetMsg = "位置:" + parser.GetErrorHeader(ex) + ":公式:" + "'" + strExp + "'有语法错误,请查看帮助中公式的语法要求";
            }

            return(bRet);
        }
示例#2
0
        private String Computing(String strExp, Hashtable hashAllVars, ref Hashtable refVarsHash, ref String strMsg)
        {
            calcExprLexer     lex    = new calcExprLexer(new AntlrInputStream("=" + strExp));
            CommonTokenStream tokens = new CommonTokenStream(lex);
            calcExprParser    parser = new calcExprParser(tokens);

            //             ParseTreeWalker walker = new ParseTreeWalker();
            //             calcExprBaseListener listener = new calcExprBaseListener();


            EvalExprVisitor visitor = new EvalExprVisitor();

            visitor.SetRefVarsHash(refVarsHash);
            visitor.SetVarHash(hashAllVars);//m_varsHash);

            IParseTree tree = null;
            EvalResult ret  = null;

            try
            {
                tree = parser.parse();
                if (tree != null)
                {
                    ret = visitor.Visit(tree);
                }
            }
            catch (RecognitionException ex)
            {
                strMsg = ex.Message;
                System.Console.Error.WriteLine(ex.StackTrace);
                return(null);
            }

            if (ret == null)
            {
                return(null);
            }

            if (ret.bInvalid)
            {
                return(ret.strExceptionMsg);
            }

            return(ret.Value1.ToString());
        }