static IEnumerable <TextSpan> GetCommentSpans(this XContainer node, IEnumerable <TextSpan> selectedSpans, bool returnComments)
{
var commentSpans = new List <TextSpan> ();
// First unify, normalize and deduplicate syntactic spans since multiple selections can result
// in a single syntactic span to be commented
var regions = new List <Span> ();
foreach (var selectedSpan in selectedSpans)
{
var region = node.GetValidCommentRegion(selectedSpan);
regions.Add(region.ToSpan());
}
var normalizedRegions = new NormalizedSpanCollection(regions);
// Then for each region cut out the existing comments that may be inside
foreach (var currentRegion in normalizedRegions)
{
int currentStart = currentRegion.Start;
// Creates comments such that current comments are excluded
var parentNode = node.GetNodeContainingRange(currentRegion.ToTextSpan());
parentNode.VisitSelfAndDescendents(child => {
if (child is XComment comment)
{
// ignore comments outside our range
if (!currentRegion.IntersectsWith(comment.Span.ToSpan()))
{
return;
}
var commentNodeSpan = comment.Span;
if (returnComments)
{
commentSpans.Add(commentNodeSpan);
}
else
{
var validCommentSpan = TextSpan.FromBounds(currentStart, commentNodeSpan.Start);
if (validCommentSpan.Length != 0)
{
commentSpans.Add(validCommentSpan);
}
currentStart = commentNodeSpan.End;
}
}
});
if (!returnComments)
{
if (currentStart <= currentRegion.End)
{
var remainingCommentSpan = TextSpan.FromBounds(currentStart, currentRegion.End);
if (remainingCommentSpan.Equals(currentRegion) || remainingCommentSpan.Length != 0)
{
// Comment any remaining uncommented area
commentSpans.Add(remainingCommentSpan);
}
}
}
}
return(commentSpans.Distinct());
}