Applied patch by Christian Hornung: Fixes for refactoring indexer expressions

git-svn-id: svn://svn.sharpdevelop.net/sharpdevelop/branches/2.0@1320 1ccf3a8d-04fe-1044-b7c0-cef0b8235c61

src/Main/Base/Project/Src/Dom/LanguageProperties.cs

@@ -115,6 +115,15 @@ namespace ICSharpCode.SharpDevelop.Dom
 			}
 		}
 		
+		/// <summary>
+		/// Gets the token that denotes a possible beginning of an indexer expression.
+		/// </summary>
+		public virtual string IndexerExpressionStartToken {
+			get {
+				return "[";
+			}
+		}
+		
 		public virtual bool ShowInNamespaceCompletion(IClass c)
 		{
 			return true;
@@ -187,6 +196,12 @@ namespace ICSharpCode.SharpDevelop.Dom
 				}
 			}
 			
+			public override string IndexerExpressionStartToken {
+				get {
+					return "(";
+				}
+			}
+			
 			public override bool ShowInNamespaceCompletion(IClass c)
 			{
 				foreach (IAttribute attr in c.Attributes) {

src/Main/Base/Project/Src/Services/RefactoringService/RefactoringMenuBuilder.cs

@@ -67,22 +67,35 @@ namespace ICSharpCode.SharpDevelop.Refactoring
 			}
 			
 			// Include menu for member that has been clicked on
-			ResolveResult rr = ResolveAtCaret(textEditorControl, textArea);
+			IExpressionFinder expressionFinder = ParserService.GetExpressionFinder(textEditorControl.FileName);
+			ExpressionResult expressionResult;
+			ResolveResult rr;
+			int insertIndex = resultItems.Count;	// Insert items at this position to get the outermost expression first, followed by the inner expressions (if any).
+			expressionResult = FindFullExpressionAtCaret(textArea, expressionFinder);
+		repeatResolve:
+			rr = ResolveExpressionAtCaret(textArea, expressionResult);
 			item = null;
 			if (rr is MethodResolveResult) {
 				item = MakeItem(definitions, ((MethodResolveResult)rr).GetMethodIfSingleOverload());
 			} else if (rr is MemberResolveResult) {
-				item = MakeItem(definitions, ((MemberResolveResult)rr).ResolvedMember);
+				MemberResolveResult mrr = (MemberResolveResult)rr;
+				item = MakeItem(definitions, mrr.ResolvedMember);
+				if (RefactoringService.FixIndexerExpression(expressionFinder, ref expressionResult, mrr)) {
+					if (item != null) {
+						resultItems.Insert(insertIndex, item);
+					}
+					// Include menu for the underlying expression of the
+					// indexer expression as well.
+					goto repeatResolve;
+				}
 			} else if (rr is TypeResolveResult) {
 				item = MakeItem(definitions, ((TypeResolveResult)rr).ResolvedClass);
 			} else if (rr is LocalResolveResult) {
 				item = MakeItem((LocalResolveResult)rr, caretLine + 1 == ((LocalResolveResult)rr).Field.Region.BeginLine);
+				insertIndex = 0;	// Insert local variable menu item at the topmost position.
 			}
 			if (item != null) {
-				if (rr is LocalResolveResult)
-					resultItems.Insert(0, item);
-				else
-					resultItems.Add(item);
+				resultItems.Insert(insertIndex, item);
 			}
 			
 			// Include menu for current class and method
@@ -200,16 +213,19 @@ namespace ICSharpCode.SharpDevelop.Refactoring
 			return item;
 		}
 		
-		ResolveResult ResolveAtCaret(TextEditorControl textEditorControl, TextArea textArea)
+		static ExpressionResult FindFullExpressionAtCaret(TextArea textArea, IExpressionFinder expressionFinder)
+		{
+			if (expressionFinder != null) {
+				return expressionFinder.FindFullExpression(textArea.Document.TextContent, textArea.Caret.Offset);
+			} else {
+				return new ExpressionResult(null);
+			}
+		}
+		
+		static ResolveResult ResolveExpressionAtCaret(TextArea textArea, ExpressionResult expressionResult)
 		{
-			IExpressionFinder expressionFinder = ParserService.GetExpressionFinder(textEditorControl.FileName);
-			if (expressionFinder == null)
-				return null;
-			IDocument doc = textArea.Document;
-			string textContent = doc.TextContent;
-			ExpressionResult expressionResult = expressionFinder.FindFullExpression(textContent, textArea.Caret.Offset);
 			if (expressionResult.Expression != null) {
-				return ParserService.Resolve(expressionResult, textArea.Caret.Line + 1, textArea.Caret.Column + 1, textArea.MotherTextEditorControl.FileName, textContent);
+				return ParserService.Resolve(expressionResult, textArea.Caret.Line + 1, textArea.Caret.Column + 1, textArea.MotherTextEditorControl.FileName, textArea.Document.TextContent);
 			}
 			return null;
 		}

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

@@ -149,6 +149,7 @@ namespace ICSharpCode.SharpDevelop.Refactoring
 		{
 			string lowerFileContent = fileContent.ToLower();
 			string searchedText; // the text that is searched for
+			bool searchingIndexer = false;
 			
 			if (member == null) {
 				searchedText = parentClass.Name.ToLower();
@@ -158,28 +159,40 @@ namespace ICSharpCode.SharpDevelop.Refactoring
 				// (examples: derived classes, partial classes)
 				if (member is IMethod && ((IMethod)member).IsConstructor)
 					searchedText = parentClass.Name.ToLower();
-				else
-					searchedText = member.Name.ToLower();
+				else {
+					if (member is IProperty && ((IProperty)member).IsIndexer) {
+						searchingIndexer = true;
+						searchedText = GetIndexerExpressionStartToken(fileName);
+					} else {
+						searchedText = member.Name.ToLower();
+					}
+				}
 			}
 			
 			int pos = -1;
+			int exprPos;
 			IExpressionFinder expressionFinder = null;
 			while ((pos = lowerFileContent.IndexOf(searchedText, pos + 1)) >= 0) {
-				if (pos > 0 && char.IsLetterOrDigit(fileContent, pos - 1)) {
-					continue; // memberName is not a whole word (a.SomeName cannot reference Name)
-				}
-				if (pos < fileContent.Length - searchedText.Length - 1
-				    && char.IsLetterOrDigit(fileContent, pos + searchedText.Length))
-				{
-					continue; // memberName is not a whole word (a.Name2 cannot reference Name)
+				if (!searchingIndexer) {
+					if (pos > 0 && char.IsLetterOrDigit(fileContent, pos - 1)) {
+						continue; // memberName is not a whole word (a.SomeName cannot reference Name)
+					}
+					if (pos < fileContent.Length - searchedText.Length - 1
+					    && char.IsLetterOrDigit(fileContent, pos + searchedText.Length))
+					{
+						continue; // memberName is not a whole word (a.Name2 cannot reference Name)
+					}
+					exprPos = pos;
+				} else {
+					exprPos = pos-1;	// indexer expressions are found by resolving the part before the indexer
 				}
 				
 				if (expressionFinder == null) {
 					expressionFinder = ParserService.GetExpressionFinder(fileName);
 				}
-				ExpressionResult expr = expressionFinder.FindFullExpression(fileContent, pos);
+				ExpressionResult expr = expressionFinder.FindFullExpression(fileContent, exprPos);
 				if (expr.Expression != null) {
-					Point position = GetPosition(fileContent, pos);
+					Point position = GetPosition(fileContent, exprPos);
 				repeatResolve:
 					// TODO: Optimize by re-using the same resolver if multiple expressions were
 					// found in this file (the resolver should parse all methods at once)
@@ -189,18 +202,14 @@ namespace ICSharpCode.SharpDevelop.Refactoring
 						// find reference to local variable
 						if (IsReferenceToLocalVariable(rr, member)) {
 							list.Add(new Reference(fileName, pos, searchedText.Length, expr.Expression, rr));
+						} else if (FixIndexerExpression(expressionFinder, ref expr, mrr)) {
+							goto repeatResolve;
 						}
 					} else if (member != null) {
 						// find reference to member
 						if (IsReferenceToMember(member, rr)) {
 							list.Add(new Reference(fileName, pos, searchedText.Length, expr.Expression, rr));
-						} else if (mrr != null && mrr.ResolvedMember is IProperty && ((IProperty)mrr.ResolvedMember).IsIndexer) {
-							// we got an indexer call as expression ("objectList[0].ToString()[2]")
-							// strip the index from the expression to resolve the underlying expression
-							string newExpr = expressionFinder.RemoveLastPart(expr.Expression);
-							if (newExpr.Length >= expr.Expression.Length)
-								throw new ApplicationException("new expression must be shorter than old expression");
-							expr.Expression = newExpr;
+						} else if (FixIndexerExpression(expressionFinder, ref expr, mrr)) {
 							goto repeatResolve;
 						}
 					} else {
@@ -221,6 +230,45 @@ namespace ICSharpCode.SharpDevelop.Refactoring
 			}
 		}
 		
+		/// <summary>
+		/// Makes the given ExpressionResult point to the underlying expression if
+		/// the expression is an indexer expression.
+		/// </summary>
+		/// <returns><c>true</c>, if the expression was an indexer expression and has been changed, <c>false</c> otherwise.</returns>
+		public static bool FixIndexerExpression(IExpressionFinder expressionFinder, ref ExpressionResult expr, MemberResolveResult mrr)
+		{
+			if (mrr != null && mrr.ResolvedMember is IProperty && ((IProperty)mrr.ResolvedMember).IsIndexer) {
+				// we got an indexer call as expression ("objectList[0].ToString()[2]")
+				// strip the index from the expression to resolve the underlying expression
+				string newExpr = expressionFinder.RemoveLastPart(expr.Expression);
+				if (newExpr.Length >= expr.Expression.Length) {
+					throw new ApplicationException("new expression must be shorter than old expression");
+				}
+				expr.Expression = newExpr;
+				return true;
+			}
+			return false;
+		}
+		
+		/// <summary>
+		/// Determines the token that denotes a possible beginning of an indexer
+		/// expression in the specified file.
+		/// </summary>
+		static string GetIndexerExpressionStartToken(string fileName)
+		{
+			if (fileName != null) {
+				ParseInformation pi = ParserService.GetParseInformation(fileName);
+				if (pi != null &&
+				    pi.MostRecentCompilationUnit != null &&
+				    pi.MostRecentCompilationUnit.ProjectContent != null &&
+				    pi.MostRecentCompilationUnit.ProjectContent.Language != null) {
+					return pi.MostRecentCompilationUnit.ProjectContent.Language.IndexerExpressionStartToken;
+				}
+			}
+			LoggingService.Warn("RefactoringService: unable to determine the correct indexer expression start token for file '"+fileName+"'");
+			return LanguageProperties.CSharp.IndexerExpressionStartToken;
+		}
+		
 		static Point GetPosition(string fileContent, int pos)
 		{
 			int line = 1;

src/Main/Base/Project/Src/TextEditor/Commands/ClassMemberMenuBuilder.cs

@@ -46,7 +46,8 @@ namespace ICSharpCode.SharpDevelop.DefaultEditor.Commands
 				&& !FindReferencesAndRenameHelper.IsReadOnly(member.DeclaringType);
 			
 			if (method == null || !method.IsConstructor) {
-				if (!FindReferencesAndRenameHelper.IsReadOnly(member.DeclaringType)) {
+				if (!FindReferencesAndRenameHelper.IsReadOnly(member.DeclaringType) &&
+				    !(member is IProperty && ((IProperty)member).IsIndexer)) {
 					cmd = new MenuCommand("${res:SharpDevelop.Refactoring.RenameCommand}", Rename);
 					cmd.Tag = member;
 					list.Add(cmd);
@@ -223,7 +224,15 @@ namespace ICSharpCode.SharpDevelop.DefaultEditor.Commands
 		{
 			MenuCommand item = (MenuCommand)sender;
 			IMember member = (IMember)item.Tag;
-			FindReferencesAndRenameHelper.ShowAsSearchResults("References to " + member.Name, RefactoringService.FindReferences(member, null));
+			string memberName;
+			if (member is IProperty && ((IProperty)member).IsIndexer) {
+				// The name of the default indexer is always "Indexer" in C#.
+				// Add the type name to clarify which indexer is referred to.
+				memberName = member.Name + " of " + member.DeclaringType.Name;
+			} else {
+				memberName = member.Name;
+			}
+			FindReferencesAndRenameHelper.ShowAsSearchResults("References to " + memberName, RefactoringService.FindReferences(member, null));
 		}
 	}
 }