public HighlightedLine HighlightLine(int lineNumber)
{
var documentLine = Document.GetLineByNumber(lineNumber);
var currentVersion = Document.Version;
EnlargeList(cachedLines, lineNumber + 1);
var cachedLine = cachedLines[lineNumber];
if (cachedLine != null && currentVersion != null && cachedLine.Version.CompareAge(currentVersion) == 0 &&
currentVersion.BelongsToSameDocumentAs(cachedLine.Version))
{
return(cachedLine);
}
cachedLines[lineNumber]?.Cancel();
var newLine = new VersionedHighlightedLine(Document, documentLine, Document.Version, cachedLine);
cachedLines[lineNumber] = newLine;
UpdateHighlightLineAsync(newLine);
foreach (var line in cachedLines.ToArray().Reverse())
{
if (!line?.DocumentLine?.IsDeleted != false)
{
break;
}
cachedLines.Remove(line);
}
return(newLine);
}
private async void UpdateHighlightLineAsync(VersionedHighlightedLine line)
{
try
{
await Task.Run(async() =>
{
await initialDelayTask.ConfigureAwait(false);
line.CancellationToken.ThrowIfCancellationRequested();
var documentLine = line.DocumentLine;
var currentVersion = Document.Version;
if (line.Version == null || !currentVersion.BelongsToSameDocumentAs(line.Version) || currentVersion.CompareAge(line.Version) != 0)
{
return;
}
var spans = await GetClassifiedSpansAsync(documentLine, line.CancellationToken).ConfigureAwait(false);
line.CancellationToken.ThrowIfCancellationRequested();
await TaskHelper.Run(() =>
{
if (line.CancellationToken.IsCancellationRequested)
{
return;
}
var newLineSections = new List <HighlightedSection>();
foreach (var classifiedSpan in spans)
{
if (IsOutsideLine(documentLine, classifiedSpan.TextSpan.Start, classifiedSpan.TextSpan.Length))
{
continue;
}
newLineSections.Add(new HighlightedSection
{
Color = CodeHighlightColors.GetHighlightingColor(classifiedSpan.ClassificationType),
Offset = classifiedSpan.TextSpan.Start,
Length = classifiedSpan.TextSpan.Length
});
}
if (!line.Sections.SequenceEqual(newLineSections, HighlightedSectionComparer.Default))
{
line.Sections.Clear();
foreach (var newSection in newLineSections)
{
line.Sections.Add(newSection);
}
HighlightingStateChanged?.Invoke(documentLine.LineNumber, documentLine.LineNumber);
}
}, uiTaskScheduler).ConfigureAwait(false);
}, line.CancellationToken);
}
catch (OperationCanceledException) { }
}
private static bool CancelUpdate(IDocument document, VersionedHighlightedLine line)
{
var currentVersion = document.Version;
return(line.CancellationToken.IsCancellationRequested || line.Version == null || !currentVersion.BelongsToSameDocumentAs(line.Version) || currentVersion.CompareAge(line.Version) != 0);
}
public VersionedHighlightedLine(IDocument document, IDocumentLine documentLine, ITextSourceVersion version, VersionedHighlightedLine oldVersion)
: base(document, documentLine)
{
Version = version;
cancellationTokenSource = new CancellationTokenSource();
CancellationToken = cancellationTokenSource.Token;
if (oldVersion != null)
{
foreach (var oldSection in oldVersion.Sections)
{
if (IsOutsideLine(documentLine, oldSection.Offset, oldSection.Length))
{
continue;
}
Sections.Add(new HighlightedSection
{
Color = oldSection.Color,
Offset = oldSection.Offset,
Length = oldSection.Length
});
}
}
}
