implement IParser.GetFileContent: allows the ParserService to work with "files" that are not written to disk

src/AddIns/BackendBindings/CSharpBinding/Project/Src/Parser/Parser.cs

@@ -68,6 +68,11 @@ namespace CSharpBinding.Parser
 		}
 		 */
 		
+		public ITextSource GetFileContent(FileName fileName)
+		{
+			return SD.FileService.GetFileContent(fileName);
+		}
+		
 		public ParseInformation Parse(FileName fileName, ITextSource fileContent, bool fullParseInformationRequested,
 		                              IProject parentProject, CancellationToken cancellationToken)
 		{

src/AddIns/BackendBindings/XamlBinding/XamlBinding/XamlParser.cs

@@ -39,9 +39,9 @@ namespace ICSharpCode.XamlBinding
 			return Path.GetExtension(fileName).Equals(".xaml", StringComparison.OrdinalIgnoreCase);
 		}
 
-		public bool CanParse(IProject project)
+		public ITextSource GetFileContent(FileName fileName)
 		{
-			return false;
+			return SD.FileService.GetFileContent(fileName);
 		}
 		
 		volatile IncrementalParserState parserState;

src/AddIns/DisplayBindings/ILSpyAddIn/ILSpyParser.cs

@@ -32,6 +32,13 @@ namespace ICSharpCode.ILSpyAddIn
 			return fileName != null && fileName.StartsWith("ilspy://", StringComparison.OrdinalIgnoreCase);
 		}
 		
+		readonly static ITextSource EmptyFileContent = new StringTextSource("");
+		
+		public ITextSource GetFileContent(FileName fileName)
+		{
+			return EmptyFileContent;
+		}
+		
 		public ParseInformation Parse(FileName fileName, ITextSource fileContent, bool fullParseInformationRequested, IProject parentProject, CancellationToken cancellationToken)
 		{
 			return ILSpyDecompilerService.DecompileType(DecompiledTypeReference.FromFileName(fileName), cancellationToken);
@@ -41,7 +48,7 @@ namespace ICSharpCode.ILSpyAddIn
 		{
 			var decompiledParseInfo = parseInfo as ILSpyFullParseInformation;
 			if (decompiledParseInfo == null)
-				throw new ArgumentException("Parse info does not have SyntaxTree");
+				throw new ArgumentException("ParseInfo does not have SyntaxTree");
 			return ResolveAtLocation.Resolve(compilation, null, decompiledParseInfo.SyntaxTree, location, cancellationToken);
 		}
 		

src/Main/Base/Project/Parser/IParser.cs

@@ -34,10 +34,14 @@ namespace ICSharpCode.SharpDevelop.Parser
 		/// </summary>
 		bool CanParse(string fileName);
 		
+		/// <summary>
+		/// Returns the content for a given filename.
+		/// </summary>
+		ITextSource GetFileContent(FileName fileName);
+		
 		/// <summary>
 		/// Parses a file.
 		/// </summary>
-		/// <param name="projectContent">The parent project of the file.</param>
 		/// <param name="fileName">The name of the file being parsed.</param>
 		/// <param name="fileContent">The content of the file.</param>
 		/// <param name="fullParseInformationRequested">

src/Main/SharpDevelop/Parser/ParserService.cs

@@ -315,7 +315,7 @@ namespace ICSharpCode.SharpDevelop.Parser
 			if (entry.parser == null)
 				return;
 			if (fileContent == null)
-				fileContent = SD.FileService.GetFileContent(fileName);
+				fileContent = entry.parser.GetFileContent(fileName);
 			if (compilation == null)
 				compilation = GetCompilationForFile(fileName);
 			var parseInfo = await entry.ParseAsync(fileContent, compilation.GetProject(), cancellationToken).ConfigureAwait(false);

src/Main/SharpDevelop/Parser/ParserServiceEntry.cs

@@ -167,7 +167,7 @@ namespace ICSharpCode.SharpDevelop.Parser
 		public ParseInformation Parse(ITextSource fileContent, IProject parentProject, CancellationToken cancellationToken)
 		{
 			if (fileContent == null) {
-				fileContent = SD.FileService.GetFileContent(fileName);
+				fileContent = parser.GetFileContent(fileName);
 			}
 			
 			return DoParse(fileContent, parentProject, true, cancellationToken).CachedParseInformation;
@@ -176,7 +176,7 @@ namespace ICSharpCode.SharpDevelop.Parser
 		public IUnresolvedFile ParseFile(ITextSource fileContent, IProject parentProject, CancellationToken cancellationToken)
 		{
 			if (fileContent == null) {
-				fileContent = SD.FileService.GetFileContent(fileName);
+				fileContent = parser.GetFileContent(fileName);
 			}
 			
 			return DoParse(fileContent, parentProject, false, cancellationToken).UnresolvedFile;
@@ -302,7 +302,7 @@ namespace ICSharpCode.SharpDevelop.Parser
 				// Let's look up the file in the list of open files right now
 				// so that we don't need to SafeThreadCall() later on.
 				lookupOpenFileOnTargetThread = false;
-				fileContent = SD.FileService.GetFileContentForOpenFile(fileName);
+				fileContent = parser.GetFileContent(fileName);
 			}
 			Task<ProjectEntry> task;
 			lock (this) {