/// <summary>
/// Returns negative value if the point is less than the span start,
/// positive if greater than or equal to the span end, and 0 otherwise.
/// </summary>
private static int CompareToSpan(ITextView textView, ReadOnlyCollection <SnapshotSpan> sourceSpans, int index, SnapshotPoint point)
{
// If this span is zero-width and there are multiple projections of the
// containing snapshot in the projection buffer, MapUpToBuffer will return
// multiple (ambiguous) projection spans. To avoid that, we compare the
// point to the end point of the nearest non-zero width span instead.
int indexToCompare = index;
while (sourceSpans[indexToCompare].IsEmpty)
{
if (indexToCompare == 0)
{
// Empty span at start of buffer. Point
// must be to the right of span.
return(1);
}
indexToCompare--;
}
var sourceSpan = sourceSpans[indexToCompare];
Debug.Assert(sourceSpan.Length > 0);
var mappedSpans = textView.BufferGraph.MapUpToBuffer(sourceSpan, SpanTrackingMode.EdgeInclusive, textView.TextBuffer);
Debug.Assert(mappedSpans.Count == 1);
var mappedSpan = mappedSpans[0];
Debug.Assert(mappedSpan.Length == sourceSpan.Length);
if (indexToCompare < index)
{
var result = point.CompareTo(mappedSpan.End);
return((result == 0) ? 1 : result);
}
else
{
var result = point.CompareTo(mappedSpan.Start);
if (result <= 0)
{
return(result);
}
result = point.CompareTo(mappedSpan.End);
return((result < 0) ? 0 : 1);
}
}
/// <summary>
/// Returns negative value if the point is less than the span start,
/// positive if greater than or equal to the span end, and 0 otherwise.
/// </summary>
private static int CompareToSpan(ITextView textView, ReadOnlyCollection<SnapshotSpan> sourceSpans, int index, SnapshotPoint point)
{
// If this span is zero-width and there are multiple projections of the
// containing snapshot in the projection buffer, MapUpToBuffer will return
// multiple (ambiguous) projection spans. To avoid that, we compare the
// point to the end point of the nearest non-zero width span instead.
int indexToCompare = index;
while (sourceSpans[indexToCompare].IsEmpty)
{
if (indexToCompare == 0)
{
// Empty span at start of buffer. Point
// must be to the right of span.
return 1;
}
indexToCompare--;
}
var sourceSpan = sourceSpans[indexToCompare];
Debug.Assert(sourceSpan.Length > 0);
var mappedSpans = textView.BufferGraph.MapUpToBuffer(sourceSpan, SpanTrackingMode.EdgeInclusive, textView.TextBuffer);
Debug.Assert(mappedSpans.Count == 1);
var mappedSpan = mappedSpans[0];
Debug.Assert(mappedSpan.Length == sourceSpan.Length);
if (indexToCompare < index)
{
var result = point.CompareTo(mappedSpan.End);
return (result == 0) ? 1 : result;
}
else
{
var result = point.CompareTo(mappedSpan.Start);
if (result <= 0)
{
return result;
}
result = point.CompareTo(mappedSpan.End);
return (result < 0) ? 0 : 1;
}
}