public StructureTag(
AbstractStructureTaggerProvider tagProvider,
BlockSpan blockSpan,
ITextSnapshot snapshot
)
{
Snapshot = snapshot;
OutliningSpan = blockSpan.TextSpan.ToSpan();
Type = ConvertType(blockSpan.Type);
IsCollapsible = blockSpan.IsCollapsible;
IsDefaultCollapsed = blockSpan.IsDefaultCollapsed;
IsImplementation = blockSpan.AutoCollapse;
if (blockSpan.HintSpan.Start < blockSpan.TextSpan.Start)
{
// The HeaderSpan is what is used for drawing the guidelines and also what is shown if
// you mouse over a guideline. We will use the text from the hint start to the collapsing
// start; in the case this spans mutiple lines the editor will clip it for us and suffix an
// ellipsis at the end.
HeaderSpan = Span.FromBounds(blockSpan.HintSpan.Start, blockSpan.TextSpan.Start);
}
else
{
var hintLine = snapshot.GetLineFromPosition(blockSpan.HintSpan.Start);
HeaderSpan = AbstractStructureTaggerProvider.TrimLeadingWhitespace(hintLine.Extent);
}
CollapsedText = blockSpan.BannerText;
CollapsedHintFormSpan = blockSpan.HintSpan.ToSpan();
_tagProvider = tagProvider;
}
protected sealed override async Task ProduceTagsAsync(
TaggerContext <TRegionTag> context, DocumentSnapshotSpan documentSnapshotSpan, int?caretPosition)
{
try
{
// Let LSP handle producing tags in the cloud scenario
if (documentSnapshotSpan.Document.IsInCloudEnvironmentClientContext())
{
return;
}
var outliningService = AbstractStructureTaggerProvider <TRegionTag> .TryGetService(context, documentSnapshotSpan);
if (outliningService != null)
{
var blockStructure = await outliningService.GetBlockStructureAsync(
documentSnapshotSpan.Document, context.CancellationToken).ConfigureAwait(false);
ProcessSpans(
context, documentSnapshotSpan.SnapshotSpan, outliningService,
blockStructure.Spans);
}
}
catch (Exception e) when(FatalError.ReportAndPropagateUnlessCanceled(e))
{
throw ExceptionUtilities.Unreachable;
}
}
protected sealed override void ProduceTagsSynchronously(
TaggerContext <TRegionTag> context, DocumentSnapshotSpan documentSnapshotSpan, int?caretPosition)
{
try
{
// Let LSP handle producing tags in the cloud scenario
if (documentSnapshotSpan.Document.IsInCloudEnvironmentClientContext())
{
return;
}
var outliningService = AbstractStructureTaggerProvider <TRegionTag> .TryGetService(context, documentSnapshotSpan);
if (outliningService != null)
{
var document = documentSnapshotSpan.Document;
var cancellationToken = context.CancellationToken;
// Try to call through the synchronous service if possible. Otherwise, fallback
// and make a blocking call against the async service.
var blockStructure = outliningService.GetBlockStructure(document, cancellationToken);
ProcessSpans(
context, documentSnapshotSpan.SnapshotSpan, outliningService,
blockStructure.Spans);
}
}
catch (Exception e) when(FatalError.ReportAndPropagateUnlessCanceled(e))
{
throw ExceptionUtilities.Unreachable;
}
}
public RegionTag(
AbstractStructureTaggerProvider <TRegionTag> provider,
ITextSnapshot snapshot,
BlockSpan outliningSpan)
{
_provider = provider;
_subjectBuffer = snapshot.TextBuffer;
BlockSpan = outliningSpan;
_hintSpan = snapshot.CreateTrackingSpan(BlockSpan.HintSpan.ToSpan(), SpanTrackingMode.EdgeExclusive);
}
private void ProcessSpansWorker(
TaggerContext <TRegionTag> context,
SnapshotSpan snapshotSpan,
BlockStructureService outliningService,
ImmutableArray <BlockSpan> spans)
{
if (spans != null)
{
var snapshot = snapshotSpan.Snapshot;
spans = AbstractStructureTaggerProvider <TRegionTag> .GetMultiLineRegions(outliningService, spans, snapshot);
// Create the outlining tags.
var tagSpanStack = new Stack <TagSpan <TRegionTag> >();
foreach (var region in spans)
{
var spanToCollapse = new SnapshotSpan(snapshot, region.TextSpan.ToSpan());
while (tagSpanStack.Count > 0 &&
tagSpanStack.Peek().Span.End <= spanToCollapse.Span.Start)
{
tagSpanStack.Pop();
}
var parentTag = tagSpanStack.Count > 0 ? tagSpanStack.Peek() : null;
var tag = CreateTag(parentTag?.Tag, snapshot, region);
if (tag != null)
{
var tagSpan = new TagSpan <TRegionTag>(spanToCollapse, tag);
context.AddTag(tagSpan);
tagSpanStack.Push(tagSpan);
}
}
}
}