private void Update(SnapshotPoint snapPt, NormalizedSnapshotSpanCollection wordSpans)
{
var parser = new BraceHighlightParser();
var spans = parser.FindMatchingBraces(snapPt.Snapshot, snapPt.Position).ToArray();
var changed = false;
var oldBraceSpans = _braceSpans;
var oldWordSpans = _wordSpans;
SnapshotSpan?updateSpan = null;
lock (_updateLock)
{
if (wordSpans != _wordSpans)
{
_wordSpans = wordSpans;
changed = true;
}
if (spans.Length < 2)
{
if (_braceSpans != null)
{
_braceSpans = null;
changed = true;
}
}
else
{
_braceSpans = new NormalizedSnapshotSpanCollection((from s in spans select new SnapshotSpan(snapPt.Snapshot, s.Start.Position, s.End.Position - s.Start.Position)));
changed = true;
}
if (changed)
{
updateSpan = null;
if (oldBraceSpans != null)
{
updateSpan = oldBraceSpans.EncompassingSpan();
}
if (oldWordSpans != null)
{
updateSpan = updateSpan.HasValue ? updateSpan.EncompassingSpan(oldWordSpans) : oldWordSpans.EncompassingSpan();
}
if (_braceSpans != null)
{
updateSpan = updateSpan.HasValue ? updateSpan.EncompassingSpan(_braceSpans) : _braceSpans.EncompassingSpan();
}
if (_wordSpans != null)
{
updateSpan = updateSpan.HasValue ? updateSpan.EncompassingSpan(_wordSpans) : _wordSpans.EncompassingSpan();
}
_updateSpan = null;
if (_braceSpans != null)
{
_updateSpan = _braceSpans.EncompassingSpan();
}
if (_wordSpans != null)
{
_updateSpan = _updateSpan.HasValue ? _updateSpan.EncompassingSpan(_wordSpans) : _wordSpans.EncompassingSpan();
}
}
}
if (changed && updateSpan.HasValue)
{
var ev = TagsChanged;
if (ev != null)
{
ev(this, new SnapshotSpanEventArgs(updateSpan.Value));
}
}
}