protected override Task ProduceTagsAsync(TaggerContext <IClassificationTag> context)
{
Debug.Assert(context.SpansToTag.IsSingle());
var spanToTag = context.SpansToTag.Single();
var document = spanToTag.Document;
// Attempt to get a classification service which will actually produce the results.
// If we can't (because we have no Document, or because the language doesn't support
// this service), then bail out immediately.
var classificationService = document?.GetLanguageService <IClassificationService>();
if (classificationService == null)
{
return(Task.CompletedTask);
}
// The LSP client will handle producing tags when running under the LSP editor.
// Our tagger implementation should return nothing to prevent conflicts.
var workspaceContextService = document?.Project.Solution.Workspace.Services.GetRequiredService <IWorkspaceContextService>();
if (workspaceContextService?.IsInLspEditorContext() == true)
{
return(Task.CompletedTask);
}
return(SemanticClassificationUtilities.ProduceTagsAsync(context, spanToTag, classificationService, _typeMap));
}
private static Task ProduceTagsAsync(TaggerContext <IClassificationTag> context, DocumentSnapshotSpan documentSpan, ClassificationTypeMap typeMap)
{
var classificationService = documentSpan.Document.GetLanguageService <IClassificationService>();
return(classificationService != null
? SemanticClassificationUtilities.ProduceTagsAsync(context, documentSpan, classificationService, typeMap)
: Task.CompletedTask);
}
public IEnumerable <ITagSpan <IClassificationTag> > GetAllTags(NormalizedSnapshotSpanCollection spans, CancellationToken cancellationToken)
{
this.AssertIsForeground();
if (spans.Count == 0)
{
return(Array.Empty <ITagSpan <IClassificationTag> >());
}
var firstSpan = spans.First();
var snapshot = firstSpan.Snapshot;
Debug.Assert(snapshot.TextBuffer == _subjectBuffer);
// We want to classify from the start of the first requested span to the end of the
// last requested span.
var spanToTag = new SnapshotSpan(snapshot,
Span.FromBounds(spans.First().Start, spans.Last().End));
// We don't need to actually classify if what we're being asked for is a subspan
// of the last classification we performed.
var cachedTaggedSpan = this.CachedTaggedSpan;
var canReuseCache =
cachedTaggedSpan?.Snapshot == snapshot &&
cachedTaggedSpan.Value.Contains(spanToTag);
if (!canReuseCache)
{
// Our cache is not there, or is out of date. We need to compute the up to date
// results.
var document = snapshot.GetOpenDocumentInCurrentContextWithChanges();
if (document == null)
{
return(Array.Empty <ITagSpan <IClassificationTag> >());
}
_classificationService = _classificationService ?? document.Project.LanguageServices.GetService <IEditorClassificationService>();
var context = new TaggerContext <IClassificationTag>(document, snapshot, cancellationToken: cancellationToken);
var task = SemanticClassificationUtilities.ProduceTagsAsync(
context, new DocumentSnapshotSpan(document, spanToTag),
_classificationService, _owner._typeMap);
task.Wait(cancellationToken);
CachedTaggedSpan = spanToTag;
CachedTags = new TagSpanIntervalTree <IClassificationTag>(snapshot.TextBuffer, SpanTrackingMode.EdgeExclusive, context.tagSpans);
}
if (this.CachedTags == null)
{
return(Array.Empty <ITagSpan <IClassificationTag> >());
}
return(this.CachedTags.GetIntersectingTagSpans(spans));
}
protected override Task ProduceTagsAsync(TaggerContext <IClassificationTag> context)
{
Debug.Assert(context.SpansToTag.IsSingle());
var spanToTag = context.SpansToTag.Single();
var document = spanToTag.Document;
_classificationService = _classificationService ?? document.Project.LanguageServices.GetService <IEditorClassificationService>();
return(SemanticClassificationUtilities.ProduceTagsAsync(context, spanToTag, _classificationService, _typeMap));
}
private Task ProduceTagsAsync <TClassificationService>(
TaggerContext <IClassificationTag> context,
DocumentSnapshotSpan documentSpan,
ClassificationTypeMap typeMap,
IClassificationDelegationService <TClassificationService> delegationService) where TClassificationService : class, ILanguageService
{
var document = documentSpan.Document;
var classificationService = document.GetLanguageService <TClassificationService>();
if (classificationService != null)
{
return(SemanticClassificationUtilities.ProduceTagsAsync(
context, documentSpan, delegationService, classificationService, typeMap));
}
return(SpecializedTasks.EmptyTask);
}
public IEnumerable <ITagSpan <IClassificationTag> > GetAllTags(NormalizedSnapshotSpanCollection spans, CancellationToken cancellationToken)
{
this.AssertIsForeground();
if (spans.Count == 0)
{
return(Array.Empty <ITagSpan <IClassificationTag> >());
}
var firstSpan = spans.First();
var snapshot = firstSpan.Snapshot;
Debug.Assert(snapshot.TextBuffer == _subjectBuffer);
var cachedSnapshot = this.CachedSnapshot;
if (snapshot != cachedSnapshot)
{
// Our cache is not there, or is out of date. We need to compute the up to date
// results.
var document = snapshot.GetOpenDocumentInCurrentContextWithChanges();
if (document == null)
{
return(Array.Empty <ITagSpan <IClassificationTag> >());
}
_classificationService = _classificationService ?? document.Project.LanguageServices.GetService <IEditorClassificationService>();
var context = new TaggerContext <IClassificationTag>(document, snapshot, cancellationToken: cancellationToken);
var spanToTag = new DocumentSnapshotSpan(document, snapshot.GetFullSpan());
var task = SemanticClassificationUtilities.ProduceTagsAsync(context, spanToTag, _classificationService, _owner._typeMap);
task.Wait(cancellationToken);
CachedSnapshot = snapshot;
CachedTags = new TagSpanIntervalTree <IClassificationTag>(snapshot.TextBuffer, SpanTrackingMode.EdgeExclusive, context.tagSpans);
}
if (this.CachedTags == null)
{
return(Array.Empty <ITagSpan <IClassificationTag> >());
}
return(this.CachedTags.GetIntersectingTagSpans(spans));
}
protected override Task ProduceTagsAsync(TaggerContext <IClassificationTag> context)
{
Debug.Assert(context.SpansToTag.IsSingle());
var spanToTag = context.SpansToTag.Single();
// Attempt to get a classification service which will actually produce the results.
// If we can't (because we have no Document, or because the language doesn't support
// this service), then bail out immediately.
var document = spanToTag.Document;
var classificationService = document?.Project.LanguageServices.GetService <IEditorClassificationService>();
if (classificationService == null)
{
return(SpecializedTasks.EmptyTask);
}
return(SemanticClassificationUtilities.ProduceTagsAsync(context, spanToTag, classificationService, _typeMap));
}
private Task ProduceTagsAsync <TClassificationService>(
TaggerContext <IClassificationTag> context,
DocumentSnapshotSpan spanToTag,
IClassificationDelegationService <TClassificationService> delegationService)
where TClassificationService : class, ILanguageService
{
var document = spanToTag.Document;
// Attempt to get a classification service which will actually produce the results.
// If we can't (because we have no Document, or because the language doesn't support
// this service), then bail out immediately.
var classificationService = document?.GetLanguageService <TClassificationService>();
if (classificationService == null)
{
return(SpecializedTasks.EmptyTask);
}
return(SemanticClassificationUtilities.ProduceTagsAsync(
context, spanToTag, delegationService, classificationService, _typeMap));
}