Example #1
0
        public string Start(List <TokensClass> tokens)
        {
            //Boolean isDone = false;
            string tokenstream = "";
            string result;
            int    line     = 1;
            int    linejump = 0;

            foreach (var t in tokens)
            {
                if (t.getLines() != line)
                {
                    linejump = t.getLines() - line;
                    line     = t.getLines();
                    for (int i = 0; i < linejump; i++)
                    {
                        tokenstream += "\n";
                    }
                }
                tokenstream += t.getTokens() + " ";
            }
            tokenstream = tokenstream.TrimEnd();

            Parser p;

            p = CreateParser(tokenstream);

            try
            {
                Node parse = p.Parse();
                Fail("parsing succeeded");
                result = "Syntax Analyzer Succeeded...";
            }
            catch (ParserCreationException e)
            {
                Fail(e.Message);
                result = e.Message;
            }
            catch (ParserLogException e)
            {
                List <int>  codes   = p.GetAllProductionCode();
                PredictSets ps      = new PredictSets();
                string      message = "Expected: ";
                errors.setColumn(e.GetError(0).Column);
                errors.setLines(e.GetError(0).Line);
                int ctr = GetSyntaxTable(codes);
                //isDone = true;

                if (codes.Count - 1 >= ctr)
                {
                    int code = codes[ctr];
                    message += ps.GetPredictSet(code);
                }
                else
                {
                    int code = codes[ctr - 1];
                    message += ps.GetPredictSet(code);
                }
                //if (p.GetLastProductionState() == "NULL")
                //{
                //    int code = p.GetLastProductionCode();
                //    message += ps.GetPredictSet(code);
                //}
                //else
                //{
                //    foreach (var item in e.GetError(0).Details)
                //    {
                //        message += item + ", ";
                //    }
                //}
                if (message == "Expected: ")
                {
                    string errormessage = e.GetError(0).ErrorMessage;
                    if (errormessage.Contains("unexpected token"))
                    {
                        errormessage = "";
                        foreach (var item in e.GetError(0).Details)
                        {
                            errormessage += item + ", ";
                        }
                    }
                    if (errormessage == "unexpected end of file")
                    {
                        errormessage = "\".\"";
                    }

                    message += errormessage;
                }

                //if (message == "Expected: @, (, &&, ||, >=, <=, <, >, ==, !=, )")
                //{
                //    message = "Expected: ";
                //    foreach (var item in e.GetError(0).Details)
                //    {
                //        message += item + ", ";
                //    }
                //}

                message += ".";

                errors.setErrorMessage(message);
                errors.setType(e.GetError(0).Type.ToString());
                result = e.Message;
            }
            recursiveprod = p.GetRecursiveProduction();
            GetSyntaxTable(p.GetAllProductionCode());
            return(result);
        }