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);
}