private static void CreateHierarchy()

in src/Microsoft.VisualStudio.SlnGen/SlnHierarchy.cs [120:169]
37 lines of code
8 McCabe index (conditional complexity)

        private static void CreateHierarchy(SlnHierarchy hierarchy, SlnProject project)
        {
            FileInfo fileInfo = new FileInfo(project.FullPath);

            DirectoryInfo directoryInfo = fileInfo.Directory;

            if (hierarchy._pathToSlnFolderMap.TryGetValue(directoryInfo!.FullName, out SlnFolder childFolder))
            {
                childFolder.Projects.Add(project);

                return;
            }

            childFolder = new SlnFolder(directoryInfo.FullName);

            childFolder.Projects.Add(project);

            hierarchy._pathToSlnFolderMap.Add(directoryInfo.FullName, childFolder);

            directoryInfo = directoryInfo.Parent;

            if (directoryInfo != null)
            {
                while (directoryInfo != null && !string.Equals(directoryInfo.FullName, hierarchy._rootFolder.FullPath, StringComparison.OrdinalIgnoreCase))
                {
                    if (!hierarchy._pathToSlnFolderMap.TryGetValue(directoryInfo.FullName, out SlnFolder folder1))
                    {
                        folder1 = new SlnFolder(directoryInfo.FullName);
                        hierarchy._pathToSlnFolderMap.Add(directoryInfo.FullName, folder1);
                    }

                    childFolder.Parent = folder1;

                    if (!folder1.Folders.Contains(childFolder))
                    {
                        folder1.Folders.Add(childFolder);
                    }

                    directoryInfo = directoryInfo.Parent;

                    childFolder = folder1;
                }

                if (!hierarchy._rootFolder.Folders.Contains(childFolder))
                {
                    hierarchy._rootFolder.Folders.Add(childFolder);
                    childFolder.Parent = hierarchy._rootFolder;
                }
            }
        }