Add any keywords to existential types

In Swift 6, this will be required. It is compatible with Swift 5.7.

Vienna/Sources/Application/DispatchTimer.swift

@@ -24,7 +24,7 @@ import os.log
 @objc(VNADispatchTimer)
 class DispatchTimer: NSObject {
 
-    private var dispatchSource: DispatchSourceTimer
+    private var dispatchSource: any DispatchSourceTimer
 
     private(set) var interval: TimeInterval
 

Vienna/Sources/Criteria/Criteria+NSPredicate.swift

@@ -58,7 +58,7 @@ extension CriteriaTree: PredicateConvertible {
         }
 
         for subPredicate in subPredicates {
-            let criteriaElement: CriteriaElement?
+            let criteriaElement: (any CriteriaElement)?
 
             if let subCompound = subPredicate as? NSCompoundPredicate {
                 // Look ahead to detect "not contains" predicate

Vienna/Sources/Criteria/Criteria+XML.swift

@@ -22,14 +22,14 @@ import Foundation
 class CriteriaXmlConverter {
 
     @objc
-    static func toXml(_ criteriaElement: CriteriaElement) -> XMLElement {
-        guard let criteriaElement = criteriaElement as? Traversable else {
+    static func toXml(_ criteriaElement: any CriteriaElement) -> XMLElement {
+        guard let criteriaElement = criteriaElement as? any Traversable else {
             fatalError("All CriteriaElement subtypes must be Traversable!")
         }
         return toXml(criteriaElement)
     }
 
-    static func toXml(_ criteriaElement: Traversable) -> XMLElement {
+    static func toXml(_ criteriaElement: any Traversable) -> XMLElement {
         return criteriaElement.traverse { element, subresult in
             let criteriaTreeXml = XMLElement(name: CriteriaTree.groupTag)
             criteriaTreeXml.setAttributesWith([CriteriaTree.conditionAttribute: "\(element.condition)"])
@@ -52,14 +52,14 @@ class CriteriaXmlConverter {
     }
 
     @objc
-    static func from(xml: XMLElement?) -> CriteriaElement? {
+    static func from(xml: XMLElement?) -> (any CriteriaElement)? {
         guard let (subtree, condition) = subtreeAndConditionFrom(xml: xml) else {
             return nil
         }
         return CriteriaTree(subtree: subtree, condition: condition)
     }
 
-    static func subtreeAndConditionFrom(xml: XMLElement?) -> (subtree: [Traversable], condition: CriteriaCondition)? {
+    static func subtreeAndConditionFrom(xml: XMLElement?) -> (subtree: [any Traversable], condition: CriteriaCondition)? {
         guard let xml = xml else {
             NSLog("CriteriaTree cannot be initialized from nil xml")
             return nil
@@ -69,14 +69,14 @@ class CriteriaXmlConverter {
         // assumes that we're matching ALL conditions.
         let conditionString = xml.attribute(forName: CriteriaTree.conditionAttribute)?.stringValue ?? ""
 
-        var subtree: [Traversable] = []
+        var subtree: [any Traversable] = []
         for child in xml.children ?? [] {
             guard let child = child as? XMLElement,
                   child.name == CriteriaTree.groupTag || child.name == CriteriaTree.criteriaTag else {
                 NSLog("Invalid node \(child) in criteria xml discovered.")
                 return nil
             }
-            let subCriteriaElement: CriteriaElement
+            let subCriteriaElement: any CriteriaElement
             if child.name == CriteriaTree.groupTag {
                 guard let subCriteriaTree = CriteriaTree(xml: child) else {
                     NSLog("CriteriaTree cannot be initialized from \(child)")
@@ -90,7 +90,7 @@ class CriteriaXmlConverter {
                 }
                 subCriteriaElement = subCriterion
             }
-            guard let subtreeElement = subCriteriaElement as? Traversable else {
+            guard let subtreeElement = subCriteriaElement as? (any Traversable) else {
                 fatalError("All CriteriaElement subtypes must be Traversable!")
             }
             subtree.append(subtreeElement)
@@ -127,7 +127,7 @@ extension CriteriaTree {
 
     @objc
     convenience init?(string: String) {
-        var xmlError: Error?
+        var xmlError: (any Error)?
         var criteriaTreeXml: XMLDocument?
         do {
             criteriaTreeXml = try XMLDocument(xmlString: string)

Vienna/Sources/Criteria/Criteria.swift

@@ -98,24 +98,24 @@ protocol Traversable: CriteriaElement {
 @objc
 class CriteriaTree: NSObject, Traversable {
     // Workaround while this variable is needed for objc (Traversable cannot be exposed)
-    @objc var criteriaTree: [CriteriaElement] {
+    @objc var criteriaTree: [any CriteriaElement] {
         get {
             traversableTree
         }
         set {
-            self.traversableTree = newValue as? [Traversable] ?? []
+            self.traversableTree = newValue as? [any Traversable] ?? []
         }
     }
 
     var condition: CriteriaCondition
 
-    var traversableTree: [Traversable]
+    var traversableTree: [any Traversable]
 
     override convenience init() {
         self.init(subtree: [], condition: .all)
     }
 
-    init(subtree: [Traversable], condition: CriteriaCondition) {
+    init(subtree: [any Traversable], condition: CriteriaCondition) {
         traversableTree = subtree
         self.condition = condition
     }

Vienna/Sources/Main window/ArticleContentView.swift

@@ -10,7 +10,7 @@ import Cocoa
 @objc
 protocol ArticleContentView {
 
-    var listView: ArticleViewDelegate? { get set }
+    var listView: (any ArticleViewDelegate)? { get set }
     var articles: [Article] { get set }
 
     @objc(keyDown:)

Vienna/Sources/Main window/Browser.swift

@@ -36,7 +36,7 @@ protocol Browser {
     /// A tabbed browser always has one tab that is selected. It is called the active tab.
     /// In case the primary tab is selected, the return value is nil
     /// (because it does not necessarily implement the Tab protocol)
-    var activeTab: Tab? { get }
+    var activeTab: (any Tab)? { get }
 
     /// Add a new tab to the open tabs of the browser
     ///
@@ -46,7 +46,7 @@ protocol Browser {
     ///   - load: whether the page to which the URL points is supposed to be loaded immediately
     ///           (otherwise it is opened when opening the tab)
     /// - Returns: the new tab
-    func createNewTab(_ url: URL?, inBackground: Bool, load: Bool) -> Tab
+    func createNewTab(_ url: URL?, inBackground: Bool, load: Bool) -> any Tab
 
     /// Saves all tabs persistently.
     /// Next time when instanciating the browser, these tabs will be re-instanciated as well.

Vienna/Sources/Main window/BrowserTab+RSSSource.swift

@@ -36,7 +36,7 @@ extension BrowserTab: RSSSource {
         }
     }
 
-    var rssSubscriber: RSSSubscriber? {
+    var rssSubscriber: (any RSSSubscriber)? {
         get {
             self.rssDelegate
         }

Vienna/Sources/Main window/BrowserTab.swift

@@ -62,7 +62,7 @@ class BrowserTab: NSViewController {
     var navigationEndHandler: [(_ success: Bool) -> Void] = []
 
     /// backing storage only, access via rssSubscriber property
-    weak var rssDelegate: RSSSubscriber?
+    weak var rssDelegate: (any RSSSubscriber)?
     /// backing storage only, access via rssUrl property
     var rssFeedUrls: [URL] = []
 
@@ -353,12 +353,12 @@ extension BrowserTab: WKNavigationDelegate {
         handleNavigationStart()
     }
 
-    func webView(_ webView: WKWebView, didFailProvisionalNavigation navigation: WKNavigation?, withError error: Error) {
+    func webView(_ webView: WKWebView, didFailProvisionalNavigation navigation: WKNavigation?, withError error: any Error) {
         // TODO: provisional navigation fail seems to translate to error in resolving URL or similar. Treat different from normal navigation fail
         handleNavigationEnd(success: false)
     }
 
-    func webView(_ webView: WKWebView, didFail navigation: WKNavigation?, withError error: Error) {
+    func webView(_ webView: WKWebView, didFail navigation: WKNavigation?, withError error: any Error) {
         // TODO: show failure to load as page or symbol
         handleNavigationEnd(success: false)
     }

Vienna/Sources/Main window/ButtonToolbarItem.swift

@@ -79,7 +79,7 @@ class ButtonToolbarItem: NSToolbarItem {
         }
 
         switch NSApp.target(forAction: action, to: target, from: self) {
-        case let validator as NSToolbarItemValidation:
+        case let validator as any NSToolbarItemValidation:
             isEnabled = validator.validateToolbarItem(self)
         default:
             isEnabled = false

Vienna/Sources/Main window/CustomWKWebView.swift

@@ -18,13 +18,13 @@ class CustomWKWebView: WKWebView {
     // store weakly here because contentController retains listener
     weak var contextMenuListener: CustomWKWebViewContextMenuListener?
 
-    weak var contextMenuProvider: CustomWKUIDelegate? {
+    weak var contextMenuProvider: (any CustomWKUIDelegate)? {
         didSet {
             self.uiDelegate = contextMenuProvider
         }
     }
 
-    @objc weak var hoverUiDelegate: CustomWKHoverUIDelegate? {
+    @objc weak var hoverUiDelegate: (any CustomWKHoverUIDelegate)? {
         didSet {
             resetHoverUiListener()
         }
@@ -393,9 +393,9 @@ extension CustomWKWebView {
 
 class CustomWKWebViewHoverListener: NSObject, WKScriptMessageHandler {
 
-    weak var hoverDelegate: CustomWKHoverUIDelegate?
+    weak var hoverDelegate: (any CustomWKHoverUIDelegate)?
 
-    init(hoverDelegate: CustomWKHoverUIDelegate) {
+    init(hoverDelegate: any CustomWKHoverUIDelegate) {
         self.hoverDelegate = hoverDelegate
     }
 

Vienna/Sources/Main window/MainWindowController.swift

@@ -35,8 +35,8 @@ final class MainWindowController: NSWindowController {
     @objc private(set) var toolbarSearchField: NSSearchField?
     @IBOutlet private(set) weak var placeholderDetailView: NSView!
 
-    @objc private(set) lazy var browser: (Browser & NSViewController) = {
-        var controller = TabbedBrowserViewController() as (Browser & NSViewController)
+    @objc private(set) lazy var browser: (any Browser & NSViewController) = {
+        var controller = TabbedBrowserViewController() as (any Browser & NSViewController)
         return controller
     }()
 
@@ -48,7 +48,7 @@ final class MainWindowController: NSWindowController {
         // cf. https://stackoverflow.com/q/16587058
         splitView.autosaveName = "VNASplitView"
 
-        (self.browser as? RSSSource)?.rssSubscriber = self
+        (self.browser as? any RSSSource)?.rssSubscriber = self
 
         statusBarState(disclosed: Preferences.standard.showStatusBar, animate: false)
 
@@ -177,7 +177,7 @@ final class MainWindowController: NSWindowController {
 
     var shareableItemsSubject = String()
 
-    private var shareableItems: [NSPasteboardWriting] {
+    private var shareableItems: [any NSPasteboardWriting] {
         var items = [URL]()
         if let activeTab = browser.activeTab, let url = activeTab.tabUrl {
             items.append(url)
@@ -518,7 +518,7 @@ extension MainWindowController: NSSharingServicePickerDelegate {
     func sharingServicePicker(
         _ sharingServicePicker: NSSharingServicePicker,
         delegateFor sharingService: NSSharingService
-    ) -> NSSharingServiceDelegate? {
+    ) -> (any NSSharingServiceDelegate)? {
         return self
     }
 

Vienna/Sources/Main window/RSSSubscriber.swift

@@ -49,5 +49,5 @@ extension RSSSubscriber {
 }
 
 protocol RSSSource: AnyObject {
-    var rssSubscriber: RSSSubscriber? { get set }
+    var rssSubscriber: (any RSSSubscriber)? { get set }
 }

Vienna/Sources/Main window/TabbedBrowserViewController.swift

@@ -63,18 +63,18 @@ class TabbedBrowserViewController: NSViewController, RSSSource {
 
     var restoredTabs = false
 
-    var activeTab: Tab? {
-        tabView?.selectedTabViewItem?.viewController as? Tab
+    var activeTab: (any Tab)? {
+        tabView?.selectedTabViewItem?.viewController as? any Tab
     }
 
     var browserTabCount: Int {
         tabView?.numberOfTabViewItems ?? 0
     }
 
-    weak var rssSubscriber: RSSSubscriber? {
+    weak var rssSubscriber: (any RSSSubscriber)? {
         didSet {
             for source in tabView?.tabViewItems ?? [] {
-                (source as? RSSSource)?.rssSubscriber = self.rssSubscriber
+                (source as? any RSSSource)?.rssSubscriber = self.rssSubscriber
             }
         }
     }
@@ -152,21 +152,21 @@ class TabbedBrowserViewController: NSViewController, RSSSource {
 }
 
 extension TabbedBrowserViewController: Browser {
-    func createNewTab(_ url: URL?, inBackground: Bool, load: Bool) -> Tab {
+    func createNewTab(_ url: URL?, inBackground: Bool, load: Bool) -> any Tab {
         createNewTab(url, inBackground: inBackground, load: load, insertAt: nil)
     }
 
-    func createNewTab(_ request: URLRequest, config: WKWebViewConfiguration, inBackground: Bool, insertAt index: Int? = nil) -> Tab {
+    func createNewTab(_ request: URLRequest, config: WKWebViewConfiguration, inBackground: Bool, insertAt index: Int? = nil) -> any Tab {
         let newTab = BrowserTab(request, config: config)
         return initNewTab(newTab, request.url, false, inBackground, insertAt: index)
     }
 
-    func createNewTab(_ url: URL? = nil, inBackground: Bool = false, load: Bool = false, insertAt index: Int? = nil) -> Tab {
+    func createNewTab(_ url: URL? = nil, inBackground: Bool = false, load: Bool = false, insertAt index: Int? = nil) -> any Tab {
         let newTab = BrowserTab()
         return initNewTab(newTab, url, load, inBackground, insertAt: index)
     }
 
-    private func initNewTab(_ newTab: BrowserTab, _ url: URL?, _ load: Bool, _ inBackground: Bool, insertAt index: Int? = nil) -> Tab {
+    private func initNewTab(_ newTab: BrowserTab, _ url: URL?, _ load: Bool, _ inBackground: Bool, insertAt index: Int? = nil) -> any Tab {
         newTab.rssSubscriber = self.rssSubscriber
 
         let newTabViewItem = TitleChangingTabViewItem(viewController: newTab)
@@ -258,7 +258,7 @@ extension TabbedBrowserViewController: MMTabBarViewDelegate {
     }
 
     func tabView(_ aTabView: NSTabView, willClose tabViewItem: NSTabViewItem) {
-        guard let tab = tabViewItem.viewController as? Tab else {
+        guard let tab = tabViewItem.viewController as? any Tab else {
             return
         }
         tab.closeTab()
@@ -288,7 +288,7 @@ extension TabbedBrowserViewController: MMTabBarViewDelegate {
         tabViewItem != primaryTab
     }
 
-    func tabView(_ aTabView: NSTabView, validateDrop sender: NSDraggingInfo, proposedItem tabViewItem: NSTabViewItem, proposedIndex: UInt, in tabBarView: MMTabBarView) -> NSDragOperation {
+    func tabView(_ aTabView: NSTabView, validateDrop sender: any NSDraggingInfo, proposedItem tabViewItem: NSTabViewItem, proposedIndex: UInt, in tabBarView: MMTabBarView) -> NSDragOperation {
         proposedIndex != 0 ? [.every] : []
     }
 
@@ -321,7 +321,7 @@ extension TabbedBrowserViewController: MMTabBarViewDelegate {
 extension TabbedBrowserViewController: CustomWKUIDelegate {
     // TODO: implement functionality for alerts and maybe peek actions
 
-    private static var contextMenuCustomizer: BrowserContextMenuDelegate = WebKitContextMenuCustomizer()
+    private static var contextMenuCustomizer: any BrowserContextMenuDelegate = WebKitContextMenuCustomizer()
 
     func webView(_ webView: WKWebView, createWebViewWith configuration: WKWebViewConfiguration, for navigationAction: WKNavigationAction, windowFeatures: WKWindowFeatures) -> WKWebView? {
         let newTab = self.createNewTab(navigationAction.request, config: configuration, inBackground: false, insertAt: getIndexAfterSelected())

Vienna/Sources/Main window/WebKitArticleTab.swift

@@ -35,7 +35,7 @@ class WebKitArticleTab: BrowserTab, ArticleContentView {
         }
     }
 
-    var listView: ArticleViewDelegate?
+    var listView: (any ArticleViewDelegate)?
 
     var articles: [Article] {
         get {
@@ -119,7 +119,7 @@ class WebKitArticleTab: BrowserTab, ArticleContentView {
         NotificationCenter.default.post(name: .articleViewEnded, object: self)
     }
 
-    override func webView(_ webView: WKWebView, didFailProvisionalNavigation navigation: WKNavigation!, withError error: Error) {
+    override func webView(_ webView: WKWebView, didFailProvisionalNavigation navigation: WKNavigation!, withError error: any Error) {
         super.webView(webView, didFailProvisionalNavigation: navigation, withError: error)
         NotificationCenter.default.post(name: .articleViewEnded, object: self)
     }

Vienna/Sources/Main window/WebKitArticleView.swift

@@ -22,7 +22,7 @@ import WebKit
 
 class WebKitArticleView: CustomWKWebView, ArticleContentView, WKNavigationDelegate, CustomWKUIDelegate {
 
-    var listView: ArticleViewDelegate?
+    var listView: (any ArticleViewDelegate)?
 
     var articles: [Article] = [] {
         didSet {
@@ -43,7 +43,7 @@ class WebKitArticleView: CustomWKWebView, ArticleContentView, WKNavigationDelega
 
     let converter = WebKitArticleConverter()
 
-    let contextMenuCustomizer: BrowserContextMenuDelegate = WebKitContextMenuCustomizer()
+    let contextMenuCustomizer: any BrowserContextMenuDelegate = WebKitContextMenuCustomizer()
 
     @objc
     init(frame: NSRect) {

Vienna/Sources/Parsing/JSONFeed.swift

@@ -35,7 +35,7 @@ class JSONFeed: NSObject, Feed, Decodable {
     var modifiedDate: Date?
 
     // The `items` key is required (but the array may be empty).
-    var items: [FeedItem]
+    var items: [any FeedItem]
 
     // MARK: Decodable
 
@@ -52,7 +52,7 @@ class JSONFeed: NSObject, Feed, Decodable {
         case author
     }
 
-    required init(from decoder: Decoder) throws {
+    required init(from decoder: any Decoder) throws {
         let container = try decoder.container(keyedBy: CodingKeys.self)
 
         title = try container.decode(String.self, forKey: .title)

Vienna/Sources/Parsing/JSONFeedItem.swift

@@ -65,7 +65,7 @@ class JSONFeedItem: NSObject, FeedItem, Decodable {
         case attachments
     }
 
-    required init(from decoder: Decoder) throws {
+    required init(from decoder: any Decoder) throws {
         let container = try decoder.container(keyedBy: CodingKeys.self)
 
         guid = try container.decode(String.self, forKey: .id)