private async Task Worker(CancellationToken cancellationToken)
{
while (true)
{
cancellationToken.ThrowIfCancellationRequested();
await _semaphore.WaitAsync(cancellationToken).ConfigureAwait(false);
HighlightedLine line;
if (!_queue.TryDequeue(out line))
{
continue;
}
var documentLine = line.DocumentLine;
IEnumerable <ClassifiedSpan> spans;
try
{
spans = await GetClassifiedSpansAsync(documentLine).ConfigureAwait(false);
}
catch (Exception)
{
continue;
}
foreach (var classifiedSpan in spans)
{
if (IsOutsideLine(classifiedSpan, documentLine))
{
continue;
}
line.Sections.Add(new HighlightedSection
{
Color = ClassificationHighlightColors.GetColor(classifiedSpan.ClassificationType),
Offset = classifiedSpan.TextSpan.Start,
Length = classifiedSpan.TextSpan.Length
});
}
OnHighlightingStateChanged(documentLine.LineNumber, documentLine.LineNumber);
}
// ReSharper disable once FunctionNeverReturns
}
private HighlightedLine DoHighlightLine(IDocumentLine documentLine)
{
_line = new HighlightedLine(_document, documentLine);
IEnumerable <ClassifiedSpan> spans;
try
{
// TODO: check offset in Roslyn's doc
spans = Classifier.GetClassifiedSpansAsync(_roslynHost.CurrentDocument,
new TextSpan(documentLine.Offset, documentLine.TotalLength), CancellationToken.None).GetAwaiter().GetResult();
}
catch (OperationCanceledException)
{
return(_line);
}
foreach (var classifiedSpan in spans)
{
if (classifiedSpan.TextSpan.Start > documentLine.EndOffset ||
classifiedSpan.TextSpan.End > documentLine.EndOffset)
{
// TODO: this shouldn't happen, but the Roslyn document and AvalonEdit's somehow get out of sync
continue;
}
_line.Sections.Add(new HighlightedSection
{
Color = ClassificationHighlightColors.GetColor(classifiedSpan.ClassificationType),
Offset = classifiedSpan.TextSpan.Start,
Length = classifiedSpan.TextSpan.Length
});
}
if (_cachedLines != null && _document.Version != null)
{
_cachedLines.Add(new CachedLine(_line, _document.Version));
}
return(_line);
}