Register parsed files in project content.

TODOnewNR.txt

@@ -6,20 +6,22 @@ Commented code, needs to be ported and re-enabled:
 	Context Actions (EditorContext etc.)
 	RefactoringService
 	FindReferencesAndRenameHelper
-	NamespaceRefactoringsService
+	NamespaceRefactoringService
 	RefactoringMenuBuilder
 	TaskService.UpdateCommentTags
 	CodeManipulation.cs (btw, I think this doesn't belong into AvalonEdit.AddIn - more a job for a language binding)
 
+--> See TODO-list on Google Docs
+
 Stuff that was renamed/moved:
 	ICSharpCode.SharpDevelop.Dom -> the type system and resolvers now are part of ICSharpCode.NRefactory
-	IDocument, ITextEditor -> moved to ICSharpCode.Editor assembly
+	IDocument -> moved to ICSharpCode.NRefactory.Editor
 	IClass -> ITypeDefinition
 	ICompilationUnit -> IParsedFile
-	ITextBuffer -> ITextSource (in ICSharpCode.Editor assembly)
+	ITextBuffer -> ITextSource (in ICSharpCode.NRefactory.Editor)
 	IReturnType -> ITypeReference (unresolved) or IType (resolved)
-	Location -> TextLocation or AstLocation. Use AstLocation only when directly working with the AST, and TextLocation otherwise.
-	TextLocation -> moved to ICSharpCode.Editor assembly
+	Location -> TextLocation in ICSharpCode.NRefactory
+	TextLocation -> moved to ICSharpCode.NRefactory
 
 Functionality changes:
 	The result of a parser run (ParseInformation) now may contain a fully parsed AST.

src/AddIns/DisplayBindings/AvalonEdit.AddIn/Src/AvalonEditViewContent.cs

@@ -176,7 +176,7 @@ namespace ICSharpCode.AvalonEdit.AddIn
 				
 				codeEditor.FileName = newFileName;
 				
-				ParserService.ParseAsync(file.FileName, codeEditor.Document);
+				ParserService.ParseAsync(file.FileName, codeEditor.Document).FireAndForget();
 			}
 		}
 		

src/AddIns/DisplayBindings/AvalonEdit.AddIn/Src/CodeEditor.cs

@@ -475,7 +475,7 @@ namespace ICSharpCode.AvalonEdit.AddIn
 						// Immediately parse on enter.
 						// This ensures we have up-to-date CC info about the method boundary when a user
 						// types near the end of a method.
-						ParserService.ParseAsync(this.FileName, this.Document.CreateSnapshot());
+						ParserService.ParseAsync(this.FileName, this.Document.CreateSnapshot()).FireAndForget();
 					}
 				}
 			}
@@ -534,7 +534,7 @@ namespace ICSharpCode.AvalonEdit.AddIn
 			ParseInformation parseInfo = ParserService.GetCachedParseInformation(this.FileName);
 			if (parseInfo == null) {
 				// if parse info is not yet available, start parsing on background
-				ParserService.ParseAsync(this.FileName, primaryTextEditorAdapter.Document);
+				ParserService.ParseAsync(this.FileName, primaryTextEditorAdapter.Document).FireAndForget();
 				// we'll receive the result using the ParseInformationUpdated event
 			}
 			ParseInformationUpdated(parseInfo);

src/AddIns/DisplayBindings/AvalonEdit.AddIn/Src/QuickClassBrowser.cs

@@ -166,6 +166,8 @@ namespace ICSharpCode.AvalonEdit.AddIn
 		void AddClasses(IEnumerable<IUnresolvedTypeDefinition> classes)
 		{
 			foreach (var c in classes) {
+				if (c.IsSynthetic)
+					continue;
 				classItems.Add(new EntityItem(c));
 				AddClasses(c.NestedTypes);
 			}
@@ -252,6 +254,8 @@ namespace ICSharpCode.AvalonEdit.AddIn
 					if (compoundClass != null) {
 						var ambience = project.GetAmbience();
 						foreach (var member in compoundClass.Members) {
+							if (member.IsSynthetic)
+								continue;
 							bool isInSamePart = string.Equals(member.UnresolvedMember.ParsedFile.FileName, selectedClass.ParsedFile.FileName, StringComparison.OrdinalIgnoreCase);
 							memberItems.Add(new EntityItem(member, ambience) { IsInSamePart = isInSamePart });
 						}

src/Main/Base/Project/ICSharpCode.SharpDevelop.csproj

@@ -386,6 +386,7 @@
     <Compile Include="Src\Services\ParserService\DomAssemblyName.cs" />
     <Compile Include="Src\Services\ParserService\Fusion.cs" />
     <Compile Include="Src\Services\ParserService\GacInterop.cs" />
+    <Compile Include="Src\Services\ParserService\ParsedFileListener.cs" />
     <Compile Include="Src\Services\ParserService\IParser.cs" />
     <Compile Include="Src\Services\ParserService\ParseInformation.cs" />
     <Compile Include="Src\Services\ParserService\LoadSolutionProjects.cs" />

src/Main/Base/Project/Src/Gui/Dialogs/NewFileDialog.cs

@@ -395,7 +395,7 @@ namespace ICSharpCode.SharpDevelop.Gui
 					File.Copy(binaryFileName, parsedFileName);
 				else
 					File.WriteAllText(parsedFileName, parsedContent, ParserService.DefaultFileEncoding);
-				ParserService.ParseFileAsync(FileName.Create(parsedFileName), new StringTextSource(parsedContent));
+				ParserService.ParseFileAsync(FileName.Create(parsedFileName), new StringTextSource(parsedContent)).FireAndForget();
 			} else {
 				if (!String.IsNullOrEmpty(binaryFileName)) {
 					LoggingService.Warn("binary file was skipped");

src/Main/Base/Project/Src/Gui/Pads/DefinitionViewPad.cs

@@ -75,7 +75,7 @@ namespace ICSharpCode.SharpDevelop.Gui
 			if (!ctl.IsVisible) return;
 			LoggingService.Debug("DefinitionViewPad.Update");
 			
-			ResolveResult res = ResolveAtCaret(e);
+			ResolveResult res = /* TODO await */ ResolveAtCaret(e);
 			if (res == null) return;
 			var pos = res.GetDefinitionRegion();
 			if (pos.IsEmpty) return;

src/Main/Base/Project/Src/Gui/Pads/ProjectBrowser/Commands/ReferenceFolderNodeCommands.cs

@@ -68,7 +68,7 @@ namespace ICSharpCode.SharpDevelop.Project.Commands
 						}
 						
 						// Update code completion.
-						ParserService.ParseFileAsync(FileName.Create(webReference.WebProxyFileName));
+						ParserService.ParseFileAsync(FileName.Create(webReference.WebProxyFileName)).FireAndForget();
 					}
 				} catch (WebException ex) {
 					MessageService.ShowException(ex, String.Format(StringParser.Parse("${res:ICSharpCode.SharpDevelop.Commands.ProjectBrowser.RefreshWebReference.ReadServiceDescriptionError}"), url.UpdateFromURL));
@@ -125,7 +125,7 @@ namespace ICSharpCode.SharpDevelop.Project.Commands
 						AddWebReferenceToProjectBrowser(node, refDialog.WebReference);
 						
 						// Add proxy to code completion.
-						ParserService.ParseFileAsync(FileName.Create(refDialog.WebReference.WebProxyFileName));
+						ParserService.ParseFileAsync(FileName.Create(refDialog.WebReference.WebProxyFileName)).FireAndForget();
 
 						node.Project.Save();
 					}

src/Main/Base/Project/Src/Project/CompilableProject.cs

@@ -507,6 +507,15 @@ namespace ICSharpCode.SharpDevelop.Project
 		{
 		}
 		
+		public override void Dispose()
+		{
+			lock (SyncRoot) {
+				if (parseProjectContentContainer != null)
+					parseProjectContentContainer.Dispose();
+			}
+			base.Dispose();
+		}
+		
 		#region IUpgradableProject
 		[Browsable(false)]
 		public virtual bool UpgradeDesired {

src/Main/Base/Project/Src/Project/CustomTool.cs

@@ -201,7 +201,7 @@ namespace ICSharpCode.SharpDevelop.Project
 			                         },
 			                         outputFileName, FileErrorPolicy.Inform);
 			EnsureOutputFileIsInProject(baseItem, outputFileName);
-			ParserService.ParseAsync(FileName.Create(outputFileName), new StringTextSource(codeOutput));
+			ParserService.ParseAsync(FileName.Create(outputFileName), new StringTextSource(codeOutput)).FireAndForget();
 		}
 		
 		public void GenerateCodeDomAsync(FileProjectItem baseItem, string outputFileName, Func<CodeCompileUnit> func)

src/Main/Base/Project/Src/Project/MSBuildBasedProject.cs

@@ -138,16 +138,6 @@ namespace ICSharpCode.SharpDevelop.Project
 			}
 		}
 		
-		volatile string mscorlibPath;
-		
-		/// <summary>
-		/// Gets the path to mscorlib.
-		/// This property is set only after ResolveAssemblyReferences() is called.
-		/// </summary>
-		public string MscorlibPath {
-			get { return mscorlibPath; }
-		}
-		
 		public override void ResolveAssemblyReferences()
 		{
 			MSBuildInternals.ResolveAssemblyReferences(this);

src/Main/Base/Project/Src/Services/File/OpenedFile.cs

@@ -461,7 +461,7 @@ namespace ICSharpCode.SharpDevelop
 					// We discarded some information when closing the file,
 					// so we need to re-parse it.
 					if (File.Exists(this.FileName))
-						ParserService.ParseAsync(this.FileName);
+						ParserService.ParseAsync(this.FileName).FireAndForget();
 					else
 						ParserService.ClearParseInformation(this.FileName);
 				}

src/Main/Base/Project/Src/Services/ParserService/Fusion.cs

@@ -5,57 +5,11 @@
 
 using System;
 using System.Runtime.InteropServices;
-using System.Runtime.InteropServices.ComTypes;
 using System.Text;
 
 namespace ICSharpCode.SharpDevelop.Parser
 {
 	// .NET Fusion COM interfaces
-	[ComImport(), Guid("E707DCDE-D1CD-11D2-BAB9-00C04F8ECEAE"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
-	internal interface IAssemblyCache
-	{
-		[PreserveSig()]
-		int UninstallAssembly(uint dwFlags,
-		                      [MarshalAs(UnmanagedType.LPWStr)] string pszAssemblyName,
-		                      IntPtr pvReserved,
-		                      out uint pulDisposition);
-		
-		[PreserveSig()]
-		int QueryAssemblyInfo(uint dwFlags,
-		                      [MarshalAs(UnmanagedType.LPWStr)] string pszAssemblyName,
-		                      IntPtr pAsmInfo);
-		
-		[PreserveSig()]
-		int CreateAssemblyCacheItem(uint dwFlags,
-		                            IntPtr pvReserved,
-		                            out IAssemblyCacheItem ppAsmItem,
-		                            [MarshalAs(UnmanagedType.LPWStr)] string pszAssemblyName);
-		
-		[PreserveSig()]
-		int CreateAssemblyScavenger(out object ppAsmScavenger);
-		
-		[PreserveSig()]
-		int InstallAssembly(uint dwFlags,
-		                    [MarshalAs(UnmanagedType.LPWStr)] string pszManifestFilePath,
-		                    IntPtr pvReserved);
-	}
-	
-	[ComImport(), Guid("9E3AAEB4-D1CD-11D2-BAB9-00C04F8ECEAE"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
-	internal interface IAssemblyCacheItem
-	{
-		void CreateStream([MarshalAs(UnmanagedType.LPWStr)] string pszName,
-		                  uint dwFormat,
-		                  uint dwFlags,
-		                  uint dwMaxSize,
-		                  out IStream ppStream);
-		
-		void IsNameEqual(IAssemblyName pName);
-		
-		void Commit(uint dwFlags);
-		
-		void MarkAssemblyVisible(uint dwFlags);
-	}
-	
 	[ComImport(), Guid("CD193BC0-B4BC-11D2-9833-00C04FC31D2E"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
 	internal interface IAssemblyName
 	{
@@ -134,47 +88,8 @@ namespace ICSharpCode.SharpDevelop.Parser
 		int Clone(out IAssemblyEnum ppEnum);
 	}
 	
-	
-	[ComImport(), Guid("1D23DF4D-A1E2-4B8B-93D6-6EA3DC285A54"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
-	internal interface IHistoryReader
-	{
-		[PreserveSig()]
-		int GetFilePath([Out(), MarshalAs(UnmanagedType.LPWStr)] StringBuilder wzFilePath,
-		                ref uint pdwSize);
-		
-		[PreserveSig()]
-		int GetApplicationName([Out(), MarshalAs(UnmanagedType.LPWStr)] StringBuilder wzAppName,
-		                       ref uint pdwSize);
-		
-		[PreserveSig()]
-		int GetEXEModulePath([Out(), MarshalAs(UnmanagedType.LPWStr)] StringBuilder wzExePath,
-		                     ref uint pdwSize);
-		
-		void GetNumActivations(out uint pdwNumActivations);
-		
-		void GetActivationDate(uint dwIdx,             // One-based!
-		                       out long /* FILETIME */ pftDate);
-		
-		[PreserveSig()]
-		int GetRunTimeVersion(ref long /* FILETIME */ pftActivationDate,
-		                      [Out(), MarshalAs(UnmanagedType.LPWStr)] StringBuilder wzRunTimeVersion,
-		                      ref uint pdwSize);
-		
-		void GetNumAssemblies(ref long /* FILETIME */ pftActivationDate,
-		                      out uint pdwNumAsms);
-		
-		void GetHistoryAssembly(ref long /* FILETIME */ pftActivationDate,
-		                        uint dwIdx,             // One-based!
-		                        [MarshalAs(UnmanagedType.IUnknown)] out object ppHistAsm);
-		
-	}
-	
 	internal static class Fusion
 	{
-		[DllImport("fusion.dll", CharSet=CharSet.Auto)]
-		internal static extern int CreateAssemblyCache(out IAssemblyCache ppAsmCache,
-		                                               uint dwReserved);
-		
 		// dwFlags: 1 = Enumerate native image (NGEN) assemblies
 		//          2 = Enumerate GAC assemblies
 		//          4 = Enumerate Downloaded assemblies
@@ -186,17 +101,6 @@ namespace ICSharpCode.SharpDevelop.Parser
 		                                              uint dwFlags,
 		                                              int pvReserved);
 		
-		[DllImport("fusion.dll", CharSet=CharSet.Auto)]
-		internal static extern int CreateAssemblyNameObject(out IAssemblyName ppName,
-		                                                    string szAssemblyName,
-		                                                    uint dwFlags,
-		                                                    int pvReserved);
-		
-		// ?????
-		[DllImport("fusion.dll")]
-		internal static extern int CreateApplicationContext(out IApplicationContext ppAppContext,
-		                                                    uint dw);
-		
 		[DllImport("fusion.dll")]
 		internal static extern int GetCachePath(uint flags,
 		                                        [MarshalAs(UnmanagedType.LPWStr)] StringBuilder wzDir,

src/Main/Base/Project/Src/Services/ParserService/ParseProjectContent.cs

@@ -19,7 +19,14 @@ namespace ICSharpCode.SharpDevelop.Parser
 	public class ParseProjectContentContainer : IDisposable
 	{
 		readonly MSBuildBasedProject project;
+		
+		/// <summary>
+		/// Lock for accessing mutable fields of this class.
+		/// To avoids deadlocks, the ParserService must not be called while holding this lock.
+		/// </summary>
 		readonly object lockObj = new object();
+		
+		readonly ParsedFileListener myListener;
 		IProjectContent projectContent;
 		IAssemblyReference[] references = { MinimalCorlib.Instance };
 		bool initializing;
@@ -31,18 +38,33 @@ namespace ICSharpCode.SharpDevelop.Parser
 				throw new ArgumentNullException("project");
 			this.project = project;
 			this.projectContent = initialProjectContent.SetAssemblyName(project.AssemblyName);
+			this.myListener = new ParsedFileListener(OnParsedFileUpdated);
 			
 			this.initializing = true;
 			LoadSolutionProjects.AddJob(Initialize, "Loading " + project.Name + "...", GetInitializationWorkAmount());
 		}
 
+		void OnParsedFileUpdated(IParsedFile oldFile, IParsedFile newFile)
+		{
+			// This method is called by the parser service within the parser service lock.
+			lock (lockObj) {
+				if (!disposed)
+					projectContent = projectContent.UpdateProjectContent(oldFile, newFile);
+			}
+		}
+		
 		public void Dispose()
 		{
+			ProjectService.ProjectItemAdded   -= OnProjectItemAdded;
+			ProjectService.ProjectItemRemoved -= OnProjectItemRemoved;
 			lock (lockObj) {
-				ProjectService.ProjectItemAdded   -= OnProjectItemAdded;
-				ProjectService.ProjectItemRemoved -= OnProjectItemRemoved;
+				if (disposed)
+					return;
 				disposed = true;
 			}
+			foreach (var fileName in GetFilesToParse(project.Items)) {
+				ParserService.RemoveParsedFileListener(fileName, myListener);
+			}
 			initializing = false;
 		}
 		
@@ -68,9 +90,9 @@ namespace ICSharpCode.SharpDevelop.Parser
 				if (disposed) {
 					throw new ObjectDisposedException("ParseProjectContent");
 				}
-				ProjectService.ProjectItemAdded += OnProjectItemAdded;
-				ProjectService.ProjectItemRemoved += OnProjectItemRemoved;
 			}
+			ProjectService.ProjectItemAdded += OnProjectItemAdded;
+			ProjectService.ProjectItemRemoved += OnProjectItemRemoved;
 			double scalingFactor = 1.0 / (project.Items.Count + LoadingReferencesWorkAmount);
 			using (IProgressMonitor initReferencesProgressMonitor = progressMonitor.CreateSubTask(LoadingReferencesWorkAmount * scalingFactor),
 			       parseProgressMonitor = progressMonitor.CreateSubTask(projectItems.Count * scalingFactor))
@@ -84,19 +106,23 @@ namespace ICSharpCode.SharpDevelop.Parser
 			initializing = false;
 		}
 		
+		IEnumerable<FileName> GetFilesToParse(IEnumerable<ProjectItem> projectItems)
+		{
+			return (
+				from p in projectItems
+				where p.ItemType == ItemType.Compile && !String.IsNullOrEmpty(p.FileName)
+				select FileName.Create(p.FileName));
+		}
+		
 		void ParseFiles(ICollection<ProjectItem> projectItems, IProgressMonitor progressMonitor)
 		{
 			ParseableFileContentFinder finder = new ParseableFileContentFinder();
-			var fileContents = (
-				from p in projectItems.AsParallel().WithCancellation(progressMonitor.CancellationToken)
-				where !ItemType.NonFileItemTypes.Contains(p.ItemType) && !String.IsNullOrEmpty(p.FileName)
-				select FileName.Create(p.FileName)
-			).ToList();
+			var fileList = GetFilesToParse(projectItems).ToList();
 			
 			object progressLock = new object();
-			double fileCountInverse = 1.0 / fileContents.Count;
+			double fileCountInverse = 1.0 / fileList.Count;
 			Parallel.ForEach(
-				fileContents,
+				fileList,
 				new ParallelOptions {
 					MaxDegreeOfParallelism = Environment.ProcessorCount,
 					CancellationToken = progressMonitor.CancellationToken
@@ -105,9 +131,13 @@ namespace ICSharpCode.SharpDevelop.Parser
 					// Don't read files we don't have a parser for.
 					// This avoids loading huge files (e.g. sdps) when we have no intention of parsing them.
 					if (ParserService.HasParser(fileName)) {
+						ParserService.AddParsedFileListener(fileName, myListener, startAsyncParse: false);
 						ITextSource content = finder.Create(fileName);
-						if (content != null)
+						if (content != null) {
+							// Parse the file on this thread so that AddParsedFileListener() does not
+							// start an asynchronous parse operation.
 							ParserService.ParseFile(fileName, content);
+						}
 					}
 					lock (progressLock) {
 						progressMonitor.Progress += fileCountInverse;
@@ -120,29 +150,20 @@ namespace ICSharpCode.SharpDevelop.Parser
 		{
 			return System.Threading.Tasks.Task.Factory.StartNew(
 				delegate {
-					project.ResolveAssemblyReferences();
-					const double assemblyResolvingProgress = 0.3;
+					var referenceItems = project.ResolveAssemblyReferences(progressMonitor.CancellationToken);
+					const double assemblyResolvingProgress = 0.3; // 30% asm resolving, 70% asm loading
 					progressMonitor.Progress += assemblyResolvingProgress;
 					progressMonitor.CancellationToken.ThrowIfCancellationRequested();
 					
 					List<string> assemblyFiles = new List<string>();
 					List<IAssemblyReference> newReferences = new List<IAssemblyReference>();
 					
-					string mscorlib = project.MscorlibPath;
-					if (mscorlib != null)
-						assemblyFiles.Add(mscorlib);
-					
-					foreach (ProjectItem item in projectItems) {
-						ReferenceProjectItem reference = item as ReferenceProjectItem;
-						if (reference != null) {
-							if (ItemType.ReferenceItemTypes.Contains(reference.ItemType)) {
-								ProjectReferenceProjectItem projectReference = reference as ProjectReferenceProjectItem;
-								if (projectReference != null) {
-									newReferences.Add(projectReference);
-								} else {
-									assemblyFiles.Add(reference.FileName);
-								}
-							}
+					foreach (var reference in referenceItems) {
+						ProjectReferenceProjectItem projectReference = reference as ProjectReferenceProjectItem;
+						if (projectReference != null) {
+							newReferences.Add(projectReference);
+						} else {
+							assemblyFiles.Add(reference.FileName);
 						}
 					}
 					
@@ -164,7 +185,7 @@ namespace ICSharpCode.SharpDevelop.Parser
 		}
 		
 		// ensure that com references are built serially because we cannot invoke multiple instances of MSBuild
-		static Queue<System.Windows.Forms.MethodInvoker> callAfterAddComReference = new Queue<System.Windows.Forms.MethodInvoker>();
+		static Queue<Action> callAfterAddComReference = new Queue<Action>();
 		static bool buildingComReference;
 		
 		void OnProjectItemAdded(object sender, ProjectItemEventArgs e)
@@ -174,7 +195,7 @@ namespace ICSharpCode.SharpDevelop.Parser
 			ReferenceProjectItem reference = e.ProjectItem as ReferenceProjectItem;
 			if (reference != null) {
 				if (reference.ItemType == ItemType.COMReference) {
-					System.Windows.Forms.MethodInvoker action = delegate {
+					Action action = delegate {
 						// Compile project to ensure interop library is generated
 						project.Save(); // project is not yet saved when ItemAdded fires, so save it here
 						string message = StringParser.Parse("\n${res:MainWindow.CompilerMessages.CreatingCOMInteropAssembly}\n");
@@ -207,13 +228,9 @@ namespace ICSharpCode.SharpDevelop.Parser
 					ReparseReferences();
 				}
 			}
-			if (e.ProjectItem.ItemType == ItemType.Import) {
-				throw new NotImplementedException();
-				//UpdateDefaultImports(project.Items);
-			} else if (e.ProjectItem.ItemType == ItemType.Compile) {
-				if (System.IO.File.Exists(e.ProjectItem.FileName)) {
-					ParserService.ParseFileAsync(FileName.Create(e.ProjectItem.FileName));
-				}
+			if (e.ProjectItem.ItemType == ItemType.Compile) {
+				var fileName = FileName.Create(e.ProjectItem.FileName);
+				ParserService.AddParsedFileListener(fileName, myListener, startAsyncParse: true);
 			}
 		}
 		
@@ -235,37 +252,9 @@ namespace ICSharpCode.SharpDevelop.Parser
 				}
 			}
 			
-			if (e.ProjectItem.ItemType == ItemType.Import) {
-				throw new NotImplementedException();
-				//UpdateDefaultImports(project.Items);
-			} else if (e.ProjectItem.ItemType == ItemType.Compile) {
-				ParserService.ClearParseInformation(FileName.Create(e.ProjectItem.FileName));
+			if (e.ProjectItem.ItemType == ItemType.Compile) {
+				ParserService.RemoveParsedFileListener(FileName.Create(e.ProjectItem.FileName), myListener);
 			}
 		}
-		
-		/*
-		int languageDefaultImportCount = -1;
-		
-		void UpdateDefaultImports(ICollection<ProjectItem> items)
-		{
-			if (languageDefaultImportCount < 0) {
-				languageDefaultImportCount = (DefaultImports != null) ? DefaultImports.Usings.Count : 0;
-			}
-			if (languageDefaultImportCount == 0) {
-				DefaultImports = null;
-			} else {
-				while (DefaultImports.Usings.Count > languageDefaultImportCount) {
-					DefaultImports.Usings.RemoveAt(languageDefaultImportCount);
-				}
-			}
-			foreach (ProjectItem item in items) {
-				if (item.ItemType == ItemType.Import) {
-					if (DefaultImports == null) {
-						DefaultImports = new DefaultUsing(this);
-					}
-					DefaultImports.Usings.Add(item.Include);
-				}
-			}
-		}*/
 	}
 }

src/Main/Base/Project/Src/Services/ParserService/ParsedFileListener.cs

@@ -0,0 +1,18 @@
+// Copyright (c) AlphaSierraPapa for the SharpDevelop Team (for details please see \doc\copyright.txt)
+// This code is distributed under the GNU LGPL (for details please see \doc\license.txt)
+
+using System;
+using ICSharpCode.NRefactory.TypeSystem;
+
+namespace ICSharpCode.SharpDevelop.Parser
+{
+	/// <summary>
+	/// Listener for parse info changes.
+	/// Caution: The callback is invoked within the parser service's lock. Beware of deadlocks!
+	/// The method is called on the thread that performed the parse operation, which might be the main thread
+	/// or a background thread.
+	/// If possible, use the <see cref="ParserService.ParseInformationUpdated"/> event instead, which is called on the main thread
+	/// and after the parser service released its lock.
+	/// </summary>
+	public delegate void ParsedFileListener(IParsedFile oldFile, IParsedFile newFile);
+}

src/Main/Base/Project/Src/Services/ParserService/ParserService.cs

@@ -261,6 +261,7 @@ namespace ICSharpCode.SharpDevelop.Parser
 			volatile ParseInformation cachedParseInformation;
 			ITextSourceVersion bufferVersion;
 			bool disposed;
+			ParsedFileListener activeListeners;
 			
 			public FileEntry(FileName fileName)
 			{
@@ -268,6 +269,38 @@ namespace ICSharpCode.SharpDevelop.Parser
 				this.parser = CreateParser(fileName);
 			}
 			
+			public void AddParsedFileListener(ParsedFileListener listener, bool startAsyncParse)
+			{
+				bool isNewEntry;
+				lock (this) {
+					isNewEntry = (this.activeListeners == null);
+					this.activeListeners += listener;
+					if (mainParsedFile != null) {
+						// We already have parse info: tell the new listener
+						listener(null, mainParsedFile);
+						// No need to start async parse.
+						isNewEntry = false;
+					}
+				}
+				if (isNewEntry && startAsyncParse)
+					ParseAsync(null).FireAndForget();
+			}
+			
+			public void RemoveParsedFileListener(ParsedFileListener listener)
+			{
+				lock (this) {
+					this.activeListeners += listener;
+				}
+			}
+			
+			public bool HasParseListeners {
+				get {
+					lock (this) {
+						return this.activeListeners != null;
+					}
+				}
+			}
+			
 			/// <summary>
 			/// Intended for unit tests only
 			/// </summary>
@@ -418,26 +451,10 @@ namespace ICSharpCode.SharpDevelop.Parser
 						}
 					}
 					
-					#warning How to update the PCs?
-					/*for (int i = 0; i < newUnits.Length; i++) {
-						IProjectContent pc = projectContents[i];
-						// update the compilation unit
-						IParsedFile oldUnit = oldUnits.FirstOrDefault(o => o.ProjectContent == pc);
-						// ensure the new unit is frozen beforewe make it visible to the outside world
-						newUnits[i].Freeze();
-						pc.UpdateProjectContent(oldUnit, newUnits[i]);
-					}*/
+					if (this.activeListeners != null)
+						this.activeListeners(mainParsedFile, resultParseInfo.ParsedFile);
 					RaiseParseInformationUpdated(new ParseInformationEventArgs(mainParsedFile, resultParseInfo));
 					
-					/*
-					// remove all old units that don't exist anymore
-					foreach (IParsedFile oldUnit in oldUnits) {
-						if (!newUnits.Any(n => n.ProjectContent == oldUnit.ProjectContent)) {
-							oldUnit.ProjectContent.UpdateProjectContent(oldUnit, null);
-							RaiseParseInformationUpdated(new ParseInformationEventArgs(oldUnit, null, false));
-						}
-					}*/
-					
 					this.bufferVersion = fileContentVersion;
 					this.mainParsedFile = resultUnit;
 					// Cached the new parse information around if it was requested, or if we had already cached parse information previously.
@@ -454,16 +471,14 @@ namespace ICSharpCode.SharpDevelop.Parser
 				IParsedFile parseInfo;
 				lock (this) {
 					// by setting the disposed flag, we'll cause all running ParseFile() calls to return null and not
-					// call into the parser anymore, so we can do the remainder of the clean-up work outside the lock
+					// call into the parser anymore
 					this.disposed = true;
 					parseInfo = this.mainParsedFile;
 					this.bufferVersion = null;
 					this.mainParsedFile = null;
+					if (parseInfo != null && this.activeListeners != null)
+						this.activeListeners(parseInfo, null);
 				}
-				/*foreach (IParsedFile oldUnit in oldUnits) {
-					oldUnit.ProjectContent.UpdateProjectContent(oldUnit, null);
-					bool isPrimary = parseInfo == oldUnit;
-				}*/
 				RaiseParseInformationUpdated(new ParseInformationEventArgs(parseInfo, null));
 			}
 			
@@ -593,7 +608,9 @@ namespace ICSharpCode.SharpDevelop.Parser
 		/// Removes all parse information (both IParsedFile and ParseInformation) for the specified file.
 		/// This method is thread-safe.
 		/// </summary>
-		public static void ClearParseInformation(FileName fileName)
+		/// <param name="force">Whether to remove the parse information even if there are listeners
+		/// registered for it.</param>
+		public static void ClearParseInformation(FileName fileName, bool force = false)
 		{
 			if (fileName == null)
 				throw new ArgumentNullException("fileName");
@@ -603,11 +620,17 @@ namespace ICSharpCode.SharpDevelop.Parser
 			FileEntry entry;
 			lock (syncLock) {
 				if (fileEntryDict.TryGetValue(fileName, out entry)) {
-					fileEntryDict.Remove(fileName);
+					// avoid concurrent deregistration of parse listener between entry.HasParseListeners and entry.Clear()
+					lock (entry) {
+						if (force || !entry.HasParseListeners) {
+							fileEntryDict.Remove(fileName);
+							// Call entry.Clear() within the lock so that we don't have a race condition
+							// when the entry is immediately recreated by another thread.
+							entry.Clear();
+						}
+					}
 				}
 			}
-			if (entry != null)
-				entry.Clear();
 		}
 		
 		/// <summary>
@@ -954,5 +977,37 @@ namespace ICSharpCode.SharpDevelop.Parser
 			tcs.SetResult(result);
 			return tcs.Task;
 		}
+		
+		/// <summary>
+		/// Adds a parsed file listener for the specified file.
+		/// If parse information for the file is already known, this method immediately invokes
+		/// <c>listener(null, existingParsedFile);</c>.
+		/// </summary>
+		/// <param name="startAsyncParse">If no parse information is already known, this parameter
+		/// controls whether an asynchronous parse operation is started.</param>
+		public static void AddParsedFileListener(FileName fileName, ParsedFileListener listener, bool startAsyncParse)
+		{
+			if (listener == null)
+				throw new ArgumentNullException("listener");
+			GetFileEntry(fileName, true).AddParsedFileListener(listener, startAsyncParse);
+		}
+		
+		/// <summary>
+		/// Removes a parsed file listener for the specified file.
+		/// This method invokes <c>listener(existingParsedFile, null);</c>. (unless existingParsedFile==null)
+		/// </summary>
+		/// <remarks>
+		/// When the last file listener is removed, the stored parse information is cleared.
+		/// </remarks>
+		public static void RemoveParsedFileListener(FileName fileName, ParsedFileListener listener)
+		{
+			if (listener == null)
+				throw new ArgumentNullException("listener");
+			FileEntry entry = GetFileEntry(fileName, false);
+			if (entry == null)
+				return;
+			entry.RemoveParsedFileListener(listener);
+			ClearParseInformation(fileName, force: false);
+		}
 	}
 }

src/Main/Base/Project/Src/Util/ExtensionMethods.cs

@@ -69,6 +69,16 @@ namespace ICSharpCode.SharpDevelop
 			}
 		}
 		
+		/// <summary>
+		/// If the task throws an exception, notifies the message service.
+		/// Call this method on asynchronous tasks if you do not care about the result, but do not want
+		/// unhandled exceptions to go unnoticed.
+		/// </summary>
+		public static void FireAndForget(this System.Threading.Tasks.Task task)
+		{
+			task.ContinueWith(t => { if (t.Exception != null) Core.MessageService.ShowException(t.Exception); });
+		}
+		
 		/// <summary>
 		/// Runs an action for all elements in the input.
 		/// </summary>