public override int SetEditLabel()

in vsintegration/src/FSharp.ProjectSystem.Base/Project/FileNode.cs [264:343]
57 lines of code
17 McCabe index (conditional complexity)

        public override int SetEditLabel(string label)
        {
            // IMPORTANT NOTE: This code will be called when a parent folder is renamed. As such, it is
            //                 expected that we can be called with a label which is the same as the current
            //                 label and this should not be considered a NO-OP.

            if (this.ProjectMgr == null || this.ProjectMgr.IsClosed)
            {
                return VSConstants.E_FAIL;
            }

            // Validate the filename. 
            if (String.IsNullOrEmpty(label))
            {
                throw new InvalidOperationException(SR.GetString(SR.ErrorInvalidFileName, CultureInfo.CurrentUICulture));
            }
            else if (label.Length > NativeMethods.MAX_PATH)
            {
                throw new InvalidOperationException(String.Format(CultureInfo.CurrentCulture, SR.GetString(SR.PathTooLong, CultureInfo.CurrentUICulture), label));
            }
            else if (Utilities.IsFileNameInvalid(label))
            {
                throw new InvalidOperationException(SR.GetString(SR.ErrorInvalidFileName, CultureInfo.CurrentUICulture));
            }

            for (HierarchyNode n = this.Parent.FirstChild; n != null; n = n.NextSibling)
            {
                if (n != this && String.Compare(n.Caption, label, StringComparison.OrdinalIgnoreCase) == 0)
                {
                    //A file or folder with the name '{0}' already exists on disk at this location. Please choose another name.
                    throw new InvalidOperationException(String.Format(CultureInfo.CurrentCulture, SR.GetString(SR.FileOrFolderAlreadyExists, CultureInfo.CurrentUICulture), label));
                }
            }

            string fileName = Path.GetFileNameWithoutExtension(label);

            // If there is no filename or it starts with a leading dot issue an error message and quit.
            if (String.IsNullOrEmpty(fileName) || fileName[0] == '.')
            {
                throw new InvalidOperationException(SR.GetString(SR.FileNameCannotContainALeadingPeriod, CultureInfo.CurrentUICulture));
            }

            // Verify that the file extension is unchanged
            string strRelPath = Path.GetFileName(this.ItemNode.GetMetadata(ProjectFileConstants.Include));
            if (String.Compare(Path.GetExtension(strRelPath), Path.GetExtension(label), StringComparison.OrdinalIgnoreCase) != 0)
            {
                // Don't prompt if we are in automation function.
                if (!Utilities.IsInAutomationFunction(this.ProjectMgr.Site))
                {
                    // Prompt to confirm that they really want to change the extension of the file
                    string message = SR.GetString(SR.ConfirmExtensionChange, CultureInfo.CurrentUICulture, new string[] { label });
                    IVsUIShell shell = this.ProjectMgr.Site.GetService(typeof(SVsUIShell)) as IVsUIShell;

                    Debug.Assert(shell != null, "Could not get the ui shell from the project");
                    if (shell == null)
                    {
                        return VSConstants.E_FAIL;
                    }

                    if (!PromptYesNoWithYesSelected(message, null, OLEMSGICON.OLEMSGICON_INFO, shell))
                    {
                        // The user cancelled the confirmation for changing the extension.
                        // Return S_OK in order not to show any extra dialog box
                        return VSConstants.S_OK;
                    }
                }
            }

            // Build the relative path by looking at folder names above us as one scenarios
            // where we get called is when a folder above us gets renamed (in which case our path is invalid)
            HierarchyNode parent = this.Parent;
            while (parent != null && (parent is FolderNode))
            {
                strRelPath = Path.Combine(parent.Caption, strRelPath);
                parent = parent.Parent;
            }

            var result = SetEditLabel(label, strRelPath);
            return result;
        }