static TextSpan GetCommentRegion(this XContainer node, int position, TextSpan span)
{
var nodeAtPosition = node.FindAtOffset(position);
// if the selection starts or ends in text, we want to preserve the
// exact span the user has selected and split the text at that boundary
if (nodeAtPosition is XText)
{
return(span);
}
if (nodeAtPosition is XComment ||
nodeAtPosition is XProcessingInstruction ||
nodeAtPosition is XCData)
{
return(nodeAtPosition.Span);
}
var nearestParentElement = nodeAtPosition.SelfAndParentsOfType <XElement> ().FirstOrDefault();
if (nearestParentElement == null)
{
return(new TextSpan(position, 0));
}
var endSpan = nearestParentElement.ClosingTag;
if (endSpan == null)
{
return(nodeAtPosition.Span);
}
int start = nearestParentElement.Span.Start;
return(new TextSpan(start, endSpan.Span.End - start));
}