/// <summary>
/// Given a point in the template buffer gets the text for that template tag.
/// </summary>
internal string GetTemplateText(SnapshotPoint point, out TemplateTokenKind kind, out int start)
{
Debug.Assert(point.Snapshot.TextBuffer == _templateBuffer);
var realPoint = _bufferGraph.MapDownToBuffer(
point,
PointTrackingMode.Positive,
_diskBuffer,
PositionAffinity.Successor);
if (realPoint != null)
{
// TODO: Binary search would be better
var pointVal = realPoint.Value;
for (int i = 0; i < _spans.Count; i++)
{
var startPoint = _spans[i].DiskBufferSpan.GetSpan(_diskBuffer.CurrentSnapshot);
if (startPoint.Start <= pointVal.Position && startPoint.End >= pointVal.Position)
{
kind = _spans[i].Kind;
start = startPoint.Start;
return(_spans[i].DiskBufferSpan.GetText(_diskBuffer.CurrentSnapshot));
}
}
}
kind = TemplateTokenKind.None;
start = 0;
return(null);
}
public static SnapshotSpan?MapUpOrDownToBuffer(this IBufferGraph bufferGraph, SnapshotSpan span, ITextBuffer targetBuffer)
{
var direction = ClassifyBufferMapDirection(span.Snapshot.TextBuffer, targetBuffer);
switch (direction)
{
case BufferMapDirection.Identity:
return(span);
case BufferMapDirection.Down:
{
var spans = bufferGraph.MapDownToBuffer(span, SpanTrackingMode.EdgeExclusive, targetBuffer);
return(spans.Select(s => (SnapshotSpan?)s).FirstOrDefault());
}
case BufferMapDirection.Up:
{
var spans = bufferGraph.MapUpToBuffer(span, SpanTrackingMode.EdgeExclusive, targetBuffer);
return(spans.Select(s => (SnapshotSpan?)s).FirstOrDefault());
}
default:
return(null);
}
}
public static SnapshotPoint?MapUpOrDownToBuffer(this IBufferGraph bufferGraph, SnapshotPoint point, ITextBuffer targetBuffer)
{
var direction = ClassifyBufferMapDirection(point.Snapshot.TextBuffer, targetBuffer);
switch (direction)
{
case BufferMapDirection.Identity:
return(point);
case BufferMapDirection.Down:
{
return(bufferGraph.MapDownToBuffer(point, PointTrackingMode.Positive, targetBuffer, PositionAffinity.Predecessor));
}
case BufferMapDirection.Up:
{
return(bufferGraph.MapUpToBuffer(point, PointTrackingMode.Positive, PositionAffinity.Predecessor, targetBuffer));
}
default:
return(null);
}
}