private static void OrganizeWorker(
SyntaxList <ExternAliasDirectiveSyntax> externAliasList,
SyntaxList <UsingDirectiveSyntax> usingList,
bool placeSystemNamespaceFirst,
out SyntaxList <ExternAliasDirectiveSyntax> organizedExternAliasList,
out SyntaxList <UsingDirectiveSyntax> organizedUsingList
)
{
if (externAliasList.Count > 0 || usingList.Count > 0)
{
// Merge the list of usings and externs into one list.
// order them in the order that they were originally in the
// file.
var initialList = usingList
.Cast <SyntaxNode>()
.Concat(externAliasList)
.OrderBy(n => n.SpanStart)
.ToList();
if (!initialList.SpansPreprocessorDirective())
{
// If there is a banner comment that precedes the nodes,
// then remove it and store it for later.
initialList[0] = initialList[
0
].GetNodeWithoutLeadingBannerAndPreprocessorDirectives(out var leadingTrivia);
var comparer = placeSystemNamespaceFirst
? UsingsAndExternAliasesDirectiveComparer.SystemFirstInstance
: UsingsAndExternAliasesDirectiveComparer.NormalInstance;
var finalList = initialList.OrderBy(comparer).ToList();
// Check if sorting the list actually changed anything. If not, then we don't
// need to make any changes to the file.
if (!finalList.SequenceEqual(initialList))
{
// Make sure newlines are correct between nodes.
EnsureNewLines(finalList);
// Reattach the banner.
finalList[0] = finalList[0].WithPrependedLeadingTrivia(leadingTrivia);
// Now split out the externs and usings back into two separate lists.
organizedExternAliasList = finalList
.Where(t => t is ExternAliasDirectiveSyntax)
.Cast <ExternAliasDirectiveSyntax>()
.ToSyntaxList();
organizedUsingList = finalList
.Where(t => t is UsingDirectiveSyntax)
.Cast <UsingDirectiveSyntax>()
.ToSyntaxList();
return;
}
}
}
organizedExternAliasList = externAliasList;
organizedUsingList = usingList;
}