internal static AntlrParseResultEventArgs ParseSnapshot(ITextSnapshot snapshot)
{
Stopwatch timer = Stopwatch.StartNew();
ITokenSource tokenSource = new GrammarLexer(new AntlrInputStream(snapshot.GetText()));
CommonTokenStream tokenStream = new CommonTokenStream(tokenSource);
GrammarParser.GrammarSpecContext parseResult;
GrammarParser parser = new GrammarParser(tokenStream);
List <ParseErrorEventArgs> errors = new List <ParseErrorEventArgs>();
try
{
parser.Interpreter.PredictionMode = PredictionMode.Sll;
parser.RemoveErrorListeners();
parser.BuildParseTree = true;
parser.ErrorHandler = new BailErrorStrategy();
parseResult = parser.grammarSpec();
}
catch (ParseCanceledException ex) when(ex.InnerException is RecognitionException)
{
tokenStream.Reset();
parser.Interpreter.PredictionMode = PredictionMode.Ll;
//parser.AddErrorListener(DescriptiveErrorListener.Default);
parser.SetInputStream(tokenStream);
parser.ErrorHandler = new DefaultErrorStrategy();
parseResult = parser.grammarSpec();
}
return(new AntlrParseResultEventArgs(snapshot, errors, timer.Elapsed, tokenStream.GetTokens(), parseResult));
}
internal static AntlrParseResultEventArgs ParseSnapshot(ITextSnapshot snapshot)
{
Stopwatch timer = Stopwatch.StartNew();
ITokenSource tokenSource = new GrammarLexer(new AntlrInputStream(snapshot.GetText()));
CommonTokenStream tokenStream = new CommonTokenStream(tokenSource);
GrammarParser.GrammarSpecContext parseResult;
GrammarParser parser = new GrammarParser(tokenStream);
List<ParseErrorEventArgs> errors = new List<ParseErrorEventArgs>();
try
{
parser.Interpreter.PredictionMode = PredictionMode.Sll;
parser.RemoveErrorListeners();
parser.BuildParseTree = true;
parser.ErrorHandler = new BailErrorStrategy();
parseResult = parser.grammarSpec();
}
catch (ParseCanceledException ex)
{
if (!(ex.InnerException is RecognitionException))
throw;
tokenStream.Reset();
parser.Interpreter.PredictionMode = PredictionMode.Ll;
//parser.AddErrorListener(DescriptiveErrorListener.Default);
parser.SetInputStream(tokenStream);
parser.ErrorHandler = new DefaultErrorStrategy();
parseResult = parser.grammarSpec();
}
return new AntlrParseResultEventArgs(snapshot, errors, timer.Elapsed, tokenStream.GetTokens(), parseResult);
}
protected override ITokenSource GetTokenSource(SnapshotSpan snapshotSpan)
{
GrammarLexer lexer = new GrammarLexer(new AntlrInputStream(snapshotSpan.Snapshot.GetText()));
lexer.RemoveErrorListeners();
ITextSnapshotLine line = snapshotSpan.Snapshot.GetLineFromPosition(snapshotSpan.Start);
lexer.InputStream.Seek(snapshotSpan.Start);
lexer.Line = line.LineNumber + 1;
lexer.Column = snapshotSpan.Start - line.Start;
return(lexer);
}
