private static Task <Document> RefactorAsync(
Document document,
SwitchSectionSyntax section,
SyntaxListSelection <SwitchLabelSyntax> selectedLabels,
CancellationToken cancellationToken)
{
SyntaxList <SwitchLabelSyntax> labels = section.Labels;
int lastIndex = selectedLabels.LastIndex;
if (selectedLabels.Last() == labels.Last())
{
lastIndex--;
}
var switchStatement = (SwitchStatementSyntax)section.Parent;
SyntaxList <SwitchSectionSyntax> sections = switchStatement.Sections;
int index = sections.IndexOf(section);
SyntaxList <SwitchSectionSyntax> newSections = sections
.ReplaceAt(index, section.RemoveNodes(labels.Take(lastIndex + 1), SyntaxRemoveOptions.KeepNoTrivia))
.InsertRange(index, CreateSwitchSections(section, selectedLabels, lastIndex));
SwitchStatementSyntax newSwitchStatement = switchStatement.WithSections(newSections);
return(document.ReplaceNodeAsync(switchStatement, newSwitchStatement, cancellationToken));
}