public ITagger <T> CreateTagger <T>(ITextBuffer buffer) where T : ITag
{
HighlightTag.InitTags(ClassificationTypeRegistry);
var classifier = new LuaClassifier(buffer, ClassificationTypeRegistry);
return(classifier as ITagger <T>);
}
public IEnumerable <ITagSpan <ClassificationTag> > GetTags(NormalizedSnapshotSpanCollection spans)
{
if (spans.Count == 0)
{
yield break;
}
var snapShot = spans[0].Snapshot;
foreach (var span in spans)
{
var startLine = span.Start.GetContainingLine();
var endLine = span.End.GetContainingLine();
var startLineNumber = startLine.LineNumber;
var endLineNumber = endLine.LineNumber;
#region Tag
for (int i = startLineNumber; i <= endLineNumber; i++)
{
var line = spans[0].Snapshot.GetLineFromLineNumber(i);
_parser.Scanner.VsSetSource(line.GetText(), 0);
int state = 0;
_lineStates.TryGetValue(i, out state);
Irony.Parsing.Token token = _parser.Scanner.VsReadToken(ref state);
while (token != null)
{
if (token.Category == Irony.Parsing.TokenCategory.Content)
{
if (token.EditorInfo != null)
{
ClassificationTag tag;
if (TryGetTag(token, out tag))
{
if (line.Start.Position + token.Location.Position + token.Length <= line.End.Position)
{
var location = new SnapshotSpan(snapShot, line.Start.Position + token.Location.Position, token.Length);
yield return(new TagSpan <ClassificationTag>(location, tag));
}
}
}
}
else if (token.Category == Irony.Parsing.TokenCategory.Comment)
{
if (line.Start.Position + token.Location.Position + token.Length <= line.End.Position)
{
var location = new SnapshotSpan(snapShot, line.Start.Position + token.Location.Position, token.Length);
yield return(new TagSpan <ClassificationTag>(location, HighlightTag.GetTagWithTokenType(TokenType.Comment)));
}
}
token = _parser.Scanner.VsReadToken(ref state);
}
int oldState = 0;
_lineStates.TryGetValue(i + 1, out oldState);
_lineStates[i + 1] = state;
//We're going into overtime, process new tags and send the event that these spans need updating!
if (oldState != state)
{
var lineNumber = endLineNumber;
while (oldState != state && lineNumber < snapShot.LineCount)
{
lineNumber++;
var dummyToken = _parser.Scanner.VsReadToken(ref state);
while (dummyToken != null)
{
dummyToken = _parser.Scanner.VsReadToken(ref state);
}
_lineStates.TryGetValue(lineNumber + 1, out oldState);
_lineStates[lineNumber + 1] = state;
}
if (lineNumber >= snapShot.LineCount)
{
lineNumber = snapShot.LineCount - 1;
}
var lastLine = snapShot.GetLineFromLineNumber(lineNumber);
if (lastLine != null && this.TagsChanged != null)
{
int length = lastLine.End.Position - endLine.End.Position;
var snapShotSpan = new SnapshotSpan(snapShot, endLine.End.Position, length);
this.TagsChanged(this, new SnapshotSpanEventArgs(snapShotSpan));
}
}
}
#endregion
}
}
private bool TryGetTag(Irony.Parsing.Token token, out ClassificationTag tag)
{
tag = HighlightTag.GetTag(token);
return(tag != null);
}
