public LineContext line()
{
LineContext _localctx = new LineContext(Context, State);
EnterRule(_localctx, 12, RULE_line);
try {
State = 58;
ErrorHandler.Sync(this);
switch (TokenStream.LA(1))
{
case T__2:
case T__6:
case ID:
case WORD:
_localctx = new UnlabeledLineContext(_localctx);
EnterOuterAlt(_localctx, 1);
{
State = 53; instruction();
}
break;
case T__3:
_localctx = new LabeledLineContext(_localctx);
EnterOuterAlt(_localctx, 2);
{
State = 54; Match(T__3);
State = 55; ((LabeledLineContext)_localctx).label = Match(ID);
State = 56; Match(T__4);
State = 57; instruction();
}
break;
default:
throw new NoViableAltException(this);
}
}
catch (RecognitionException re) {
_localctx.exception = re;
ErrorHandler.ReportError(this, re);
ErrorHandler.Recover(this, re);
}
finally {
ExitRule();
}
return(_localctx);
}
public override void ExitLabeledLine([NotNull] LabeledLineContext context)
{
base.ExitLabeledLine(context);
var symbol = context.ID().Symbol;
CheckValidLabel(symbol, isIdentifyingLine: true);
var text = symbol.Text;
if (_usedLabels.Contains(text))
{
var message = new Message(
SeverityEnum.Error,
$"Labels' must identify only one instruction.",
symbol.Line,
symbol.Column);
_messages.Add(message);
}
else
{
_usedLabels.Add(text);
}
}