public UsingsSorter(StyleCopSettings settings, SemanticModel semanticModel, CompilationUnitSyntax compilationUnit, ImmutableArray <SyntaxTrivia> fileHeader)
{
this.separateSystemDirectives = settings.OrderingRules.SystemUsingDirectivesFirst;
this.insertBlankLinesBetweenGroups = settings.OrderingRules.BlankLinesBetweenUsingGroups == OptionSetting.Require;
this.semanticModel = semanticModel;
this.fileHeader = fileHeader;
this.sourceMap = SourceMap.FromCompilationUnit(compilationUnit);
this.ProcessUsingDirectives(compilationUnit.Usings);
this.ProcessMembers(compilationUnit.Members);
}
