// Step 8: You must implement the GetTags method. This method takes a collection of SnapshotSpan objects
// and returns an enumeration of tag spans.
//
// In C#, implement this method as a yield iterator, which enables lazy evaluation (that is, evaluation
// of the set only when individual items are accessed) of the tags. In Visual Basic, add the tags to a list and return the list.
//
// Here the method returns a TagSpan<T> object that has a "blue" TextMarkerTag, which provides a blue background.
public IEnumerable <ITagSpan <HighlightWordTag> > GetTags(NormalizedSnapshotSpanCollection spans)
{
if (CurrentWord == null)
{
yield break;
}
// Hold on to a "snapshot" of the word spans and current word, so that we maintain the same
// collection throughout
SnapshotSpan currentWord = CurrentWord.Value;
NormalizedSnapshotSpanCollection wordSpans = WordSpans;
if (spans.Count == 0 || wordSpans.Count == 0)
{
yield break;
}
// If the requested snapshot isn't the same as the one our words are on, translate our spans to the expected snapshot
if (spans[0].Snapshot != wordSpans[0].Snapshot)
{
wordSpans = new NormalizedSnapshotSpanCollection(
wordSpans.Select(span => span.TranslateTo(spans[0].Snapshot, SpanTrackingMode.EdgeExclusive)));
currentWord = currentWord.TranslateTo(spans[0].Snapshot, SpanTrackingMode.EdgeExclusive);
}
// First, yield back the word the cursor is under (if it overlaps)
// Note that we'll yield back the same word again in the wordspans collection;
// the duplication here is expected.
if (spans.OverlapsWith(new NormalizedSnapshotSpanCollection(currentWord)))
{
yield return(new TagSpan <HighlightWordTag>(currentWord, new HighlightWordTag()));
}
// Second, yield all the other words in the file
foreach (SnapshotSpan span in NormalizedSnapshotSpanCollection.Overlap(spans, wordSpans))
{
yield return(new TagSpan <HighlightWordTag>(span, new HighlightWordTag()));
}
}
/// <summary>
/// Gets all the tags that intersect the specified spans.
/// </summary>
/// <param name="spans">The spans to visit.</param>
public IEnumerable <ITagSpan <TextMarkerTag> > GetTags(NormalizedSnapshotSpanCollection spans)
{
EmmetCommandTarget filter;
bool hasTags = _view.Properties.TryGetProperty("EmmetCommandTarget", out filter);
if (!hasTags || !filter.HasActiveTabStops)
{
yield break;
}
Span[] expansionSpans = filter.GetTabStopsToHighlight();
foreach (Span span in expansionSpans)
{
SnapshotSpan snapshotSpan;
try
{
if (span.Length is 0)
{
snapshotSpan = new SnapshotSpan(_buffer.CurrentSnapshot, new Span(span.Start, 1));
}
else
{
snapshotSpan = new SnapshotSpan(_buffer.CurrentSnapshot, span);
}
}
catch (ArgumentOutOfRangeException)
{
// Sometimes happens when quickly pressing Undo etc.
continue;
}
if (!string.IsNullOrWhiteSpace(snapshotSpan.GetText()) && spans.OverlapsWith(snapshotSpan))
{
yield return(new TagSpan <TextMarkerTag>(
snapshotSpan, new TextMarkerTag("MarkerFormatDefinition/HighlightedReference")));
}
}
}
public IEnumerable <ITagSpan <TextMarkerTag> > GetTags(NormalizedSnapshotSpanCollection spans)
{
if (this.currentWord == null)
{
yield break;
}
var currentWord = this.currentWord.Value;
var wordSpans = this.wordSpans;
if (spans.Count == 0 || this.wordSpans.Count == 0)
{
yield break;
}
if (spans[0].Snapshot != wordSpans[0].Snapshot)
{
wordSpans = new NormalizedSnapshotSpanCollection(
wordSpans.Select(span => span.TranslateTo(spans[0].Snapshot, SpanTrackingMode.EdgeExclusive)));
currentWord = currentWord.TranslateTo(spans[0].Snapshot, SpanTrackingMode.EdgeExclusive);
}
if (spans.OverlapsWith(new NormalizedSnapshotSpanCollection(currentWord)))
{
yield return(new TagSpan <ReferenceHighlightWordTag>(currentWord, new ReferenceHighlightWordTag()));
}
foreach (SnapshotSpan span in NormalizedSnapshotSpanCollection.Overlap(spans, wordSpans))
{
yield return(new TagSpan <ReferenceHighlightWordTag>(span, new ReferenceHighlightWordTag()));
}
if (navigationWordSpans != null)
{
yield return(new TagSpan <DefinitionHighlightWordTag>(navigationWordSpans.Value, new DefinitionHighlightWordTag()));
}
}
public IEnumerable <ITagSpan <ClassificationTag> > GetTags(NormalizedSnapshotSpanCollection spans)
{
if (CurrentWord == null)
{
yield break;
}
// Hold on to a "snapshot" of the word spans and current word, so that the same collection is maintained throughout
SnapshotSpan currentWord = CurrentWord.Value;
NormalizedSnapshotSpanCollection wordSpans = WordSpans;
if (spans.Count == 0 || WordSpans.Count == 0)
{
yield break;
}
// If the requested snapshot isn't the same as the one the words are on, translate the spans to the expected snapshot
if (spans[0].Snapshot != wordSpans[0].Snapshot)
{
wordSpans = new NormalizedSnapshotSpanCollection(wordSpans.Select(span => span.TranslateTo(spans[0].Snapshot, SpanTrackingMode.EdgeExclusive)));
currentWord = currentWord.TranslateTo(spans[0].Snapshot, SpanTrackingMode.EdgeExclusive);
}
// First, yield back the word the cursor is under (if it overlaps)
// Note that this will yield back the same word again in the wordspans collection; the duplication here is expected.
if (spans.OverlapsWith(new NormalizedSnapshotSpanCollection(currentWord)))
{
yield return(new TagSpan <ClassificationTag>(currentWord, new ClassificationTag(TypeService.GetClassificationType(Constants.FONT_FORMAT_NAME))));
}
// Second, yield all the other words in the file
foreach (SnapshotSpan span in NormalizedSnapshotSpanCollection.Overlap(spans, wordSpans))
{
yield return(new TagSpan <ClassificationTag>(span, new ClassificationTag(TypeService.GetClassificationType(Constants.FONT_FORMAT_NAME))));
}
}
