Move active code from LanguageSettings to LanguageService

.editorconfig

@@ -147,3 +147,5 @@ dotnet_naming_rule.private_fields_rule.symbols = private_fields_symbols
 
 # MEF006: No importing constructor
 dotnet_diagnostic.MEF006.severity = silent
+# MEF002: Import attributes, to be removed after final DI migration
+dotnet_diagnostic.MEF002.severity = silent

ILSpy.ReadyToRun/ReadyToRunLanguage.cs

@@ -218,7 +218,7 @@ public override void DecompileMethod(IMethod method, ITextOutput output, Decompi
 
 		public override RichText GetRichTextTooltip(IEntity entity)
 		{
-			return Languages.ILLanguage.GetRichTextTooltip(entity);
+			return LanguageService.Instance.ILLanguage.GetRichTextTooltip(entity);
 		}
 
 		private ReadyToRunReaderCacheEntry GetReader(LoadedAssembly assembly, MetadataFile file)

ILSpy.Tests/Analyzers/MemberImplementsInterfaceAnalyzerTests.cs

@@ -145,7 +145,7 @@ public void VerifyReturnsOnlyInterfaceMembers()
 			var analyzer = new MemberImplementsInterfaceAnalyzer();
 
 			// Act
-			var results = analyzer.Analyze(symbol, new AnalyzerContext() { AssemblyList = new ILSpyX.AssemblyList(), Language = new CSharpLanguage() });
+			var results = analyzer.Analyze(symbol, new AnalyzerContext() { AssemblyList = new ILSpyX.AssemblyList(), Language = new CSharpLanguage([]) });
 
 			// Assert
 			Assert.That(results, Is.Not.Null);

ILSpy.Tests/Analyzers/MethodUsesAnalyzerTests.cs

@@ -30,7 +30,7 @@ public void Setup()
 			testAssembly = assemblyList.OpenAssembly(typeof(MethodUsesAnalyzerTests).Assembly.Location);
 			assemblyList.OpenAssembly(typeof(void).Assembly.Location);
 			testAssemblyTypeSystem = testAssembly.GetTypeSystemOrNull();
-			language = new CSharpLanguage();
+			language = new CSharpLanguage([]);
 			typeDefinition = testAssemblyTypeSystem.FindType(typeof(TestCases.Main.MainAssembly)).GetDefinition();
 		}
 

ILSpy.Tests/Analyzers/TypeUsedByAnalyzerTests.cs

@@ -41,7 +41,7 @@ public void Setup()
 			assemblyList = new AssemblyList();
 			testAssembly = assemblyList.OpenAssembly(typeof(MethodUsesAnalyzerTests).Assembly.Location);
 			testAssemblyTypeSystem = new DecompilerTypeSystem(testAssembly.GetMetadataFileOrNull(), testAssembly.GetAssemblyResolver());
-			language = new CSharpLanguage();
+			language = new CSharpLanguage([]);
 		}
 
 		[Test]

ILSpy/Analyzers/AnalyzerTreeNode.cs

@@ -25,7 +25,7 @@ namespace ICSharpCode.ILSpy.Analyzers
 {
 	public abstract class AnalyzerTreeNode : SharpTreeNode
 	{
-		public Language Language => SettingsService.Instance.SessionSettings.LanguageSettings.Language;
+		public Language Language => LanguageService.Instance.Language;
 
 		public override bool CanDelete()
 		{

ILSpy/AssemblyTree/AssemblyTreeModel.cs

@@ -108,7 +108,7 @@ private void Settings_PropertyChanged(object? sender, PropertyChangedEventArgs e
 			{
 				switch (e.PropertyName)
 				{
-					case nameof(LanguageSettings.Language) or nameof(LanguageSettings.LanguageVersion):
+					case nameof(LanguageSettings.LanguageId) or nameof(LanguageSettings.LanguageVersionId):
 						RefreshDecompiledView();
 						break;
 					default:
@@ -152,7 +152,7 @@ private bool HandleCommandLineArguments(CommandLineArguments args)
 		{
 			LoadAssemblies(args.AssembliesToLoad, commandLineLoadedAssemblies, focusNode: false);
 			if (args.Language != null)
-				SettingsService.Instance.SessionSettings.LanguageSettings.Language = Languages.GetLanguage(args.Language);
+				LanguageService.Instance.Language = LanguageService.Instance.GetLanguage(args.Language);
 			return true;
 		}
 
@@ -787,7 +787,7 @@ public void DecompileSelectedNodes(DecompilerTextViewState? newState = null)
 				return;
 			}
 
-			var options = SettingsService.Instance.CreateDecompilationOptions(activeTabPage);
+			var options = LanguageService.Instance.CreateDecompilationOptions(activeTabPage);
 			options.TextViewState = newState;
 			activeTabPage.ShowTextViewAsync(textView => textView.DecompileAsync(this.CurrentLanguage, this.SelectedNodes, options));
 		}
@@ -797,9 +797,9 @@ public void RefreshDecompiledView()
 			DecompileSelectedNodes(DockWorkspace.Instance.ActiveTabPage.GetState() as DecompilerTextViewState);
 		}
 
-		public Language CurrentLanguage => SettingsService.Instance.SessionSettings.LanguageSettings.Language;
+		public Language CurrentLanguage => LanguageService.Instance.Language;
 
-		public LanguageVersion CurrentLanguageVersion => SettingsService.Instance.SessionSettings.LanguageSettings.LanguageVersion;
+		public LanguageVersion? CurrentLanguageVersion => LanguageService.Instance.LanguageVersion;
 
 		public IEnumerable<ILSpyTreeNode> SelectedNodes {
 			get {

ILSpy/Commands/DecompileAllCommand.cs

@@ -20,6 +20,7 @@
 
 using System;
 using System.Collections.Concurrent;
+using System.Collections.Generic;
 using System.ComponentModel.Composition;
 using System.Diagnostics;
 using System.Linq;
@@ -31,14 +32,20 @@
 using ICSharpCode.ILSpy.TextView;
 using ICSharpCode.ILSpyX;
 
-using TomsToolbox.Essentials;
-
 namespace ICSharpCode.ILSpy
 {
 	[ExportMainMenuCommand(ParentMenuID = nameof(Resources._File), Header = nameof(Resources.DEBUGDecompile), MenuCategory = nameof(Resources.Open), MenuOrder = 2.5)]
 	[PartCreationPolicy(CreationPolicy.Shared)]
 	sealed class DecompileAllCommand : SimpleCommand
 	{
+		private readonly IReadOnlyCollection<IResourceFileHandler> resourceFileHandlers;
+
+		[ImportingConstructor]
+		public DecompileAllCommand([ImportMany] IEnumerable<IResourceFileHandler> resourceFileHandlers)
+		{
+			this.resourceFileHandlers = resourceFileHandlers.ToArray();
+		}
+
 		public override bool CanExecute(object parameter)
 		{
 			return System.IO.Directory.Exists("c:\\temp\\decompiled");
@@ -60,10 +67,10 @@ public override void Execute(object parameter)
 							{
 								try
 								{
-									var options = SettingsService.Instance.CreateDecompilationOptions(DockWorkspace.Instance.ActiveTabPage);
+									var options = LanguageService.Instance.CreateDecompilationOptions(DockWorkspace.Instance.ActiveTabPage);
 									options.CancellationToken = ct;
 									options.FullDecompilation = true;
-									new CSharpLanguage().DecompileAssembly(asm, new PlainTextOutput(writer), options);
+									new CSharpLanguage(resourceFileHandlers).DecompileAssembly(asm, new PlainTextOutput(writer), options);
 								}
 								catch (Exception ex)
 								{
@@ -95,10 +102,10 @@ sealed class Decompile100TimesCommand : SimpleCommand
 		public override void Execute(object parameter)
 		{
 			const int numRuns = 100;
-			var language = SettingsService.Instance.SessionSettings.LanguageSettings.Language;
+			var language = LanguageService.Instance.Language;
 			var nodes = MainWindow.Instance.AssemblyTreeModel.SelectedNodes.ToArray();
 			DockWorkspace dockWorkspace = DockWorkspace.Instance;
-			var options = SettingsService.Instance.CreateDecompilationOptions(dockWorkspace.ActiveTabPage);
+			var options = LanguageService.Instance.CreateDecompilationOptions(dockWorkspace.ActiveTabPage);
 			dockWorkspace.RunWithCancellation(ct => Task<AvalonEditTextOutput>.Factory.StartNew(() => {
 				options.CancellationToken = ct;
 				Stopwatch w = Stopwatch.StartNew();

ILSpy/Commands/DisassembleAllCommand.cs

@@ -56,7 +56,7 @@ public override void Execute(object parameter)
 							{
 								try
 								{
-									var options = SettingsService.Instance.CreateDecompilationOptions(dockWorkspace.ActiveTabPage);
+									var options = LanguageService.Instance.CreateDecompilationOptions(dockWorkspace.ActiveTabPage);
 									options.FullDecompilation = true;
 									options.CancellationToken = ct;
 									new ILLanguage().DecompileAssembly(asm, new Decompiler.PlainTextOutput(writer), options);

ILSpy/Commands/GeneratePdbContextMenuEntry.cs

@@ -75,7 +75,7 @@ internal static void GeneratePdbForAssembly(LoadedAssembly assembly)
 			if (dlg.ShowDialog() != true)
 				return;
 			DockWorkspace dockWorkspace = DockWorkspace.Instance;
-			DecompilationOptions options = SettingsService.Instance.CreateDecompilationOptions(dockWorkspace.ActiveTabPage);
+			DecompilationOptions options = LanguageService.Instance.CreateDecompilationOptions(dockWorkspace.ActiveTabPage);
 			string fileName = dlg.FileName;
 			dockWorkspace.RunWithCancellation(ct => Task<AvalonEditTextOutput>.Factory.StartNew(() => {
 				AvalonEditTextOutput output = new AvalonEditTextOutput();

ILSpy/Commands/SaveCodeContextMenuEntry.cs

@@ -62,7 +62,7 @@ public static void Execute(IReadOnlyList<SharpTreeNode> selectedNodes)
 			var settingsService = SettingsService.Instance;
 			var dockWorkspace = Docking.DockWorkspace.Instance;
 
-			var currentLanguage = settingsService.SessionSettings.LanguageSettings.Language;
+			var currentLanguage = LanguageService.Instance.Language;
 			var tabPage = dockWorkspace.ActiveTabPage;
 			tabPage.ShowTextView(textView => {
 				if (selectedNodes.Count == 1 && selectedNodes[0] is ILSpyTreeNode singleSelection)
@@ -88,7 +88,7 @@ public static void Execute(IReadOnlyList<SharpTreeNode> selectedNodes)
 
 				// Fallback: if nobody was able to handle the request, use default behavior.
 				// try to save all nodes to disk.
-				var options = settingsService.CreateDecompilationOptions(dockWorkspace.ActiveTabPage);
+				var options = LanguageService.Instance.CreateDecompilationOptions(dockWorkspace.ActiveTabPage);
 				options.FullDecompilation = true;
 				textView.SaveToDisk(currentLanguage, selectedNodes.OfType<ILSpyTreeNode>(), options);
 			});

ILSpy/LanguageSettings.cs

@@ -17,13 +17,14 @@
 // DEALINGS IN THE SOFTWARE.
 
 using System.Collections.Generic;
-using System.Linq;
 using System.Xml.Linq;
 
 using ICSharpCode.ILSpyX;
 
 using TomsToolbox.Wpf;
 
+#nullable enable
+
 namespace ICSharpCode.ILSpy
 {
 	/// <summary>
@@ -42,9 +43,8 @@ public LanguageSettings(XElement element, ISettingsSection parent)
 		{
 			Parent = parent;
 			this.ShowApiLevel = (ApiVisibility?)(int?)element.Element("ShowAPILevel") ?? ApiVisibility.PublicAndInternal;
-			this.Language = Languages.GetLanguage((string)element.Element("Language")) ?? Languages.AllLanguages.First();
-			this.LanguageVersion = Language.LanguageVersions.FirstOrDefault(v => v.Version == (string)element.Element("LanguageVersion"))
-								   ?? Language.LanguageVersions.LastOrDefault();
+			this.LanguageId = (string?)element.Element("Language");
+			this.LanguageVersionId = (string?)element.Element("LanguageVersion");
 		}
 
 		public ISettingsSection Parent { get; }
@@ -54,8 +54,8 @@ public XElement SaveAsXml()
 			return new XElement(
 				"FilterSettings",
 				new XElement("ShowAPILevel", (int)this.ShowApiLevel),
-				new XElement("Language", this.Language.Name),
-				new XElement("LanguageVersion", this.LanguageVersion?.Version)
+				new XElement("Language", this.LanguageId),
+				new XElement("LanguageVersion", this.LanguageVersionId)
 			);
 		}
 
@@ -111,7 +111,7 @@ public bool ApiVisAll {
 			}
 		}
 
-		Language language;
+		string? languageId;
 
 		/// <summary>
 		/// Gets/Sets the current language.
@@ -120,37 +120,12 @@ public bool ApiVisAll {
 		/// While this isn't related to filtering, having it as part of the FilterSettings
 		/// makes it easy to pass it down into all tree nodes.
 		/// </remarks>
-		public Language Language {
-			get { return language; }
-			set {
-				if (language != value)
-				{
-					if (language != null && language.HasLanguageVersions)
-					{
-						languageVersionHistory[language] = languageVersion;
-					}
-					language = value;
-					OnPropertyChanged();
-					if (language.HasLanguageVersions)
-					{
-						if (languageVersionHistory.TryGetValue(value, out var version))
-						{
-							LanguageVersion = version;
-						}
-						else
-						{
-							LanguageVersion = Language.LanguageVersions.Last();
-						}
-					}
-					else
-					{
-						LanguageVersion = default;
-					}
-				}
-			}
+		public string? LanguageId {
+			get => languageId;
+			set => SetProperty(ref languageId, value);
 		}
 
-		LanguageVersion languageVersion;
+		string? languageVersionId;
 
 		/// <summary>
 		/// Gets/Sets the current language version.
@@ -159,19 +134,9 @@ public Language Language {
 		/// While this isn't related to filtering, having it as part of the FilterSettings
 		/// makes it easy to pass it down into all tree nodes.
 		/// </remarks>
-		public LanguageVersion LanguageVersion {
-			get { return languageVersion; }
-			set {
-				if (languageVersion != value)
-				{
-					languageVersion = value;
-					if (language.HasLanguageVersions)
-					{
-						languageVersionHistory[language] = languageVersion;
-					}
-					OnPropertyChanged();
-				}
-			}
+		public string? LanguageVersionId {
+			get { return languageVersionId; }
+			set => SetProperty(ref languageVersionId, value);
 		}
 
 		// This class has been initially called FilterSettings, but then has been Hijacked to store language settings as well.

ILSpy/Languages/CSharpLanguage.cs

@@ -38,7 +38,6 @@
 using ICSharpCode.Decompiler.Output;
 using ICSharpCode.Decompiler.Solution;
 using ICSharpCode.Decompiler.TypeSystem;
-using ICSharpCode.Decompiler.Util;
 using ICSharpCode.ILSpy.TextView;
 using ICSharpCode.ILSpy.TreeNodes;
 using ICSharpCode.ILSpyX;
@@ -56,26 +55,34 @@ namespace ICSharpCode.ILSpy
 	[PartCreationPolicy(CreationPolicy.Shared)]
 	public class CSharpLanguage : Language
 	{
+		readonly IReadOnlyCollection<IResourceFileHandler> resourceFileHandlers;
+
 		string name = "C#";
 		bool showAllMembers = false;
 		int transformCount = int.MaxValue;
 
+		[ImportingConstructor]
+		public CSharpLanguage([ImportMany] IEnumerable<IResourceFileHandler> resourceFileHandlers)
+		{
+			this.resourceFileHandlers = resourceFileHandlers.ToArray();
+		}
+
 #if DEBUG
-		internal static IEnumerable<CSharpLanguage> GetDebugLanguages()
+		internal static IEnumerable<CSharpLanguage> GetDebugLanguages(IReadOnlyCollection<IResourceFileHandler> resourceFileHandlers)
 		{
 			string lastTransformName = "no transforms";
 			int transformCount = 0;
 			foreach (var transform in CSharpDecompiler.GetAstTransforms())
 			{
-				yield return new CSharpLanguage {
+				yield return new CSharpLanguage(resourceFileHandlers) {
 					transformCount = transformCount,
 					name = "C# - " + lastTransformName,
 					showAllMembers = true
 				};
 				lastTransformName = "after " + transform.GetType().Name;
 				transformCount++;
 			}
-			yield return new CSharpLanguage {
+			yield return new CSharpLanguage(resourceFileHandlers) {
 				name = "C# - " + lastTransformName,
 				showAllMembers = true
 			};
@@ -430,8 +437,9 @@ public override ProjectId DecompileAssembly(LoadedAssembly assembly, ITextOutput
 				{
 					options.DecompilerSettings.UseSdkStyleProjectFormat = false;
 				}
-				var decompiler = new ILSpyWholeProjectDecompiler(assembly, options);
-				decompiler.ProgressIndicator = options.Progress;
+				var decompiler = new ILSpyWholeProjectDecompiler(assembly, options, resourceFileHandlers) {
+					ProgressIndicator = options.Progress
+				};
 				return decompiler.DecompileProject(module, options.SaveAsProjectDirectory, new TextOutputWriter(output), options.CancellationToken);
 			}
 			else
@@ -542,18 +550,20 @@ class ILSpyWholeProjectDecompiler : WholeProjectDecompiler
 		{
 			readonly LoadedAssembly assembly;
 			readonly DecompilationOptions options;
+			private readonly IReadOnlyCollection<IResourceFileHandler> resourceFileHandlers;
 
-			public ILSpyWholeProjectDecompiler(LoadedAssembly assembly, DecompilationOptions options)
+			public ILSpyWholeProjectDecompiler(LoadedAssembly assembly, DecompilationOptions options, IReadOnlyCollection<IResourceFileHandler> resourceFileHandlers)
 				: base(options.DecompilerSettings, assembly.GetAssemblyResolver(options.DecompilerSettings.AutoLoadAssemblyReferences, options.DecompilerSettings.ApplyWindowsRuntimeProjections), null, assembly.GetAssemblyReferenceClassifier(options.DecompilerSettings.ApplyWindowsRuntimeProjections), assembly.GetDebugInfoOrNull())
 			{
 				this.assembly = assembly;
 				this.options = options;
+				this.resourceFileHandlers = resourceFileHandlers;
 			}
 
 			protected override IEnumerable<ProjectItemInfo> WriteResourceToFile(string fileName, string resourceName, Stream entryStream)
 			{
 				var context = new ResourceFileHandlerContext(options);
-				foreach (var handler in App.ExportProvider.GetExportedValues<IResourceFileHandler>())
+				foreach (var handler in resourceFileHandlers)
 				{
 					if (handler.CanHandle(fileName, context))
 					{

ILSpy/Languages/ILLanguage.cs

@@ -201,7 +201,7 @@ public override RichText GetRichTextTooltip(IEntity entity)
 			var settingsService = SettingsService.Instance;
 			var dockWorkspace = DockWorkspace.Instance;
 
-			var disasm = CreateDisassembler(output, settingsService.CreateDecompilationOptions(dockWorkspace.ActiveTabPage));
+			var disasm = CreateDisassembler(output, LanguageService.Instance.CreateDecompilationOptions(dockWorkspace.ActiveTabPage));
 			MetadataFile module = entity.ParentModule?.MetadataFile;
 			if (module == null)
 			{