protected virtual void NoViableAlt(int s, IIntStream input)
{
if (recognizer.state.backtracking > 0)
{
recognizer.state.failed = true;
return;
}
NoViableAltException nvae =
new NoViableAltException(Description,
decisionNumber,
s,
input);
Error(nvae);
throw nvae;
}
public override string GetErrorMessage(RecognitionException e, string[] tokenNames)
{
string msg = null;
if (e is MismatchedTokenException)
{
MismatchedTokenException mte = (MismatchedTokenException)e;
msg = "mismatched character " + GetCharErrorDisplay(e.Character) + " expecting " + GetCharErrorDisplay(mte.Expecting);
}
else if (e is NoViableAltException)
{
NoViableAltException nvae = (NoViableAltException)e;
// for development, can add "decision=<<"+nvae.grammarDecisionDescription+">>"
// and "(decision="+nvae.decisionNumber+") and
// "state "+nvae.stateNumber
msg = "no viable alternative at character " + GetCharErrorDisplay(e.Character);
}
else if (e is EarlyExitException)
{
EarlyExitException eee = (EarlyExitException)e;
// for development, can add "(decision="+eee.decisionNumber+")"
msg = "required (...)+ loop did not match anything at character " + GetCharErrorDisplay(e.Character);
}
else if (e is MismatchedNotSetException)
{
MismatchedNotSetException mse = (MismatchedNotSetException)e;
msg = "mismatched character " + GetCharErrorDisplay(e.Character) + " expecting set " + mse.Expecting;
}
else if (e is MismatchedSetException)
{
MismatchedSetException mse = (MismatchedSetException)e;
msg = "mismatched character " + GetCharErrorDisplay(e.Character) + " expecting set " + mse.Expecting;
}
else if (e is MismatchedRangeException)
{
MismatchedRangeException mre = (MismatchedRangeException)e;
msg = "mismatched character " + GetCharErrorDisplay(e.Character) + " expecting set " +
GetCharErrorDisplay(mre.A) + ".." + GetCharErrorDisplay(mre.B);
}
else
{
msg = base.GetErrorMessage(e, tokenNames);
}
return(msg);
}
/** <summary>A hook for debugging interface</summary> */
public virtual void Error(NoViableAltException nvae)
{
}
