/// <summary>
/// Method calculates the span from the start of the editor changes and until the end of TagSpans
/// </summary>
private SnapshotSpan CalculateSpanOfChanges(INormalizedTextChangeCollection changeCollection, ITextSnapshot newTextSnapshot)
{
var startSpans = changeCollection.Select(x => x.NewSpan).ToArray();
var endSpans = TagSpans.Select(x => x.Span.Span);
return(CalculateAffectedSpan(newTextSnapshot, startSpans, endSpans));
}
private IReadOnlyList <TextChangeRange> GetChangeRanges(ITextSnapshot snapshot1, ITextSnapshot snapshot2, bool forward)
{
var oldSnapshot = forward ? snapshot1 : snapshot2;
var newSnapshot = forward ? snapshot2 : snapshot1;
INormalizedTextChangeCollection changes = null;
for (var oldVersion = oldSnapshot.Version;
oldVersion != newSnapshot.Version;
oldVersion = oldVersion.Next)
{
if (oldVersion.Changes.Count != 0)
{
if (changes != null)
{
// Oops - more than one "textual" change between these snapshots, bail and try to find smallest changes span
//Logger.Log(FunctionId.Workspace_SourceText_GetChangeRanges, s_textLog, snapshot1.Version.VersionNumber, snapshot2.Version.VersionNumber);
return(new[] { GetChangeRanges(oldSnapshot.Version, newSnapshot.Version, forward) });
}
else
{
changes = oldVersion.Changes;
}
}
}
if (changes == null)
{
return(ImmutableArray.Create <TextChangeRange>());
}
else
{
return(ImmutableArray.CreateRange(changes.Select(forward ? s_forwardTextChangeRange : s_backwardTextChangeRange)));
}
}