private bool UpdateFileVisibility()

in src/StructuredLogViewer/Controls/BuildControl.xaml.cs [333:386]
50 lines of code
15 McCabe index (conditional complexity)

        private bool UpdateFileVisibility(IEnumerable<NamedNode> items, string text)
        {
            bool visible = false;

            if (items == null)
            {
                return false;
            }

            foreach (var item in items)
            {
                if (item is Folder folder)
                {
                    var subItems = folder.Children.OfType<NamedNode>();
                    var folderVisibility = UpdateFileVisibility(subItems, text);
                    folder.IsVisible = folderVisibility;
                    visible |= folderVisibility;
                }
                else if (item is SourceFile file)
                {
                    if (string.IsNullOrEmpty(text) || file.SourceFilePath.IndexOf(text, StringComparison.OrdinalIgnoreCase) > -1)
                    {
                        visible = true;
                        file.IsVisible = true;
                    }
                    else
                    {
                        file.IsVisible = false;
                    }

                    var subItems = file.Children.OfType<NamedNode>();
                    var fileVisibility = UpdateFileVisibility(subItems, text);
                    file.IsVisible |= fileVisibility;
                    visible |= fileVisibility;
                }
                else if (item is Target || item is Task)
                {
                    if (string.IsNullOrEmpty(text) ||
                        item.Name.IndexOf(text, StringComparison.OrdinalIgnoreCase) > -1 ||
                        (text == "$target" && item is Target) ||
                        (text == "$task" && item is Task))
                    {
                        visible = true;
                        item.IsVisible = true;
                    }
                    else
                    {
                        item.IsVisible = false;
                    }
                }
            }

            return visible;
        }