public static async Task ComputeRefactoringsAsync(RefactoringContext context, SyntaxToken modifier)
        {
            SyntaxNode node = modifier.Parent;

            if (node.IsKind(SyntaxKind.DestructorDeclaration))
            {
                return;
            }

            ModifiersInfo modifiersInfo = SyntaxInfo.ModifiersInfo(node);

            if (node.IsKind(
                    SyntaxKind.ClassDeclaration,
                    SyntaxKind.InterfaceDeclaration,
                    SyntaxKind.StructDeclaration))
            {
                SemanticModel semanticModel = await context.GetSemanticModelAsync().ConfigureAwait(false);

                var symbol = (INamedTypeSymbol)semanticModel.GetDeclaredSymbol(node, context.CancellationToken);

                ImmutableArray <SyntaxReference> syntaxReferences = symbol.DeclaringSyntaxReferences;

                if (syntaxReferences.Length > 1)
                {
                    ImmutableArray <MemberDeclarationSyntax> memberDeclarations = ImmutableArray.CreateRange(
                        syntaxReferences,
                        f => (MemberDeclarationSyntax)f.GetSyntax(context.CancellationToken));

                    foreach (Accessibility accessibility in ChangeAccessibilityRefactoring.Accessibilities)
                    {
                        if (accessibility != modifiersInfo.Accessibility &&
                            CSharpUtility.IsAllowedAccessibility(node, accessibility))
                        {
                            context.RegisterRefactoring(
                                ChangeAccessibilityRefactoring.GetTitle(accessibility),
                                cancellationToken => ChangeAccessibilityRefactoring.RefactorAsync(context.Solution, memberDeclarations, accessibility, cancellationToken));
                        }
                    }

                    return;
                }
            }

            foreach (Accessibility accessibility in ChangeAccessibilityRefactoring.Accessibilities)
            {
                if (accessibility == modifiersInfo.Accessibility)
                {
                    continue;
                }

                SemanticModel semanticModel = await context.GetSemanticModelAsync().ConfigureAwait(false);

                ISymbol symbol = GetBaseSymbolOrDefault(semanticModel, context.CancellationToken);

                if (symbol != null)
                {
                    if (CSharpUtility.IsAllowedAccessibility(node, accessibility, allowOverride: true))
                    {
                        context.RegisterRefactoring(
                            ChangeAccessibilityRefactoring.GetTitle(accessibility),
                            cancellationToken => ChangeAccessibilityRefactoring.RefactorAsync(context.Solution, symbol, accessibility, cancellationToken));
                    }
                }
                else if (CSharpUtility.IsAllowedAccessibility(node, accessibility))
                {
                    context.RegisterRefactoring(
                        ChangeAccessibilityRefactoring.GetTitle(accessibility),
                        cancellationToken => ChangeAccessibilityRefactoring.RefactorAsync(context.Document, node, accessibility, cancellationToken));
                }
            }

            ISymbol GetBaseSymbolOrDefault(SemanticModel semanticModel, CancellationToken cancellationToken)
            {
                if (modifiersInfo.HasAbstractOrVirtualOrOverride)
                {
                    return(ChangeAccessibilityRefactoring.GetBaseSymbolOrDefault(node, semanticModel, cancellationToken));
                }

                return(null);
            }
        }
Exemple #2
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        public static bool IsAllowedAccessibility(SyntaxNode node, Accessibility accessibility, bool allowOverride = false)
        {
            switch (node.Parent?.Kind())
            {
            case SyntaxKind.NamespaceDeclaration:
            case SyntaxKind.CompilationUnit:
            {
                return(accessibility.Is(Accessibility.Public, Accessibility.Internal));
            }

            case SyntaxKind.StructDeclaration:
            {
                if (accessibility.ContainsProtected())
                {
                    return(false);
                }

                break;
            }
            }

            switch (node.Kind())
            {
            case SyntaxKind.ClassDeclaration:
            case SyntaxKind.InterfaceDeclaration:
            case SyntaxKind.StructDeclaration:
            case SyntaxKind.EnumDeclaration:
            {
                return(true);
            }

            case SyntaxKind.EventDeclaration:
            {
                var eventDeclaration = (EventDeclarationSyntax)node;

                ModifiersInfo info = SyntaxInfo.ModifiersInfo(eventDeclaration);

                return((allowOverride || !info.HasOverride) &&
                       (!accessibility.IsPrivate() || !info.HasAbstractOrVirtualOrOverride) &&
                       CheckProtectedInStaticOrSealedClass(node, accessibility) &&
                       CheckAccessorAccessibility(eventDeclaration.AccessorList, accessibility));
            }

            case SyntaxKind.IndexerDeclaration:
            {
                var indexerDeclaration = (IndexerDeclarationSyntax)node;

                ModifiersInfo info = SyntaxInfo.ModifiersInfo(indexerDeclaration);

                return((allowOverride || !info.HasOverride) &&
                       (!accessibility.IsPrivate() || !info.HasAbstractOrVirtualOrOverride) &&
                       CheckProtectedInStaticOrSealedClass(node, accessibility) &&
                       CheckAccessorAccessibility(indexerDeclaration.AccessorList, accessibility));
            }

            case SyntaxKind.PropertyDeclaration:
            {
                var propertyDeclaration = (PropertyDeclarationSyntax)node;

                ModifiersInfo info = SyntaxInfo.ModifiersInfo(propertyDeclaration);

                return((allowOverride || !info.HasOverride) &&
                       (!accessibility.IsPrivate() || !info.HasAbstractOrVirtualOrOverride) &&
                       CheckProtectedInStaticOrSealedClass(node, accessibility) &&
                       CheckAccessorAccessibility(propertyDeclaration.AccessorList, accessibility));
            }

            case SyntaxKind.MethodDeclaration:
            {
                var methodDeclaration = (MethodDeclarationSyntax)node;

                ModifiersInfo info = SyntaxInfo.ModifiersInfo(methodDeclaration);

                return((allowOverride || !info.HasOverride) &&
                       (!accessibility.IsPrivate() || !info.HasAbstractOrVirtualOrOverride) &&
                       CheckProtectedInStaticOrSealedClass(node, accessibility));
            }

            case SyntaxKind.EventFieldDeclaration:
            {
                var eventFieldDeclaration = (EventFieldDeclarationSyntax)node;

                ModifiersInfo info = SyntaxInfo.ModifiersInfo(eventFieldDeclaration);

                return((allowOverride || !info.HasOverride) &&
                       (!accessibility.IsPrivate() || !info.HasAbstractOrVirtualOrOverride) &&
                       CheckProtectedInStaticOrSealedClass(node, accessibility));
            }

            case SyntaxKind.ConstructorDeclaration:
            case SyntaxKind.DelegateDeclaration:
            case SyntaxKind.FieldDeclaration:
            case SyntaxKind.IncompleteMember:
            {
                return(CheckProtectedInStaticOrSealedClass(node, accessibility));
            }

            case SyntaxKind.OperatorDeclaration:
            case SyntaxKind.ConversionOperatorDeclaration:
            {
                return(accessibility == Accessibility.Public);
            }

            case SyntaxKind.GetAccessorDeclaration:
            case SyntaxKind.SetAccessorDeclaration:
            case SyntaxKind.AddAccessorDeclaration:
            case SyntaxKind.RemoveAccessorDeclaration:
            case SyntaxKind.UnknownAccessorDeclaration:
            {
                var memberDeclaration = node.Parent?.Parent as MemberDeclarationSyntax;

                Debug.Assert(memberDeclaration != null, node.ToString());

                if (memberDeclaration != null)
                {
                    if (!CheckProtectedInStaticOrSealedClass(memberDeclaration, accessibility))
                    {
                        return(false);
                    }

                    Accessibility declarationAccessibility = memberDeclaration.GetModifiers().GetAccessibility();

                    if (declarationAccessibility == Accessibility.NotApplicable)
                    {
                        declarationAccessibility = memberDeclaration.GetDefaultExplicitAccessibility();
                    }

                    return(accessibility.IsMoreRestrictiveThan(declarationAccessibility));
                }

                return(false);
            }

            case SyntaxKind.LocalFunctionStatement:
            {
                return(false);
            }

            default:
            {
                Debug.Fail(node.Kind().ToString());
                return(false);
            }
            }
        }