private static void Handle(SyntaxNodeAnalysisContext context) { if (!context.IsExcludedFromAnalysis() && context.ContainingSymbol is IMethodSymbol method && context.Node is MethodDeclarationSyntax methodDeclaration) { if (OnPropertyChanged.IsMatch(method, context.SemanticModel, context.CancellationToken, out var parameter) == AnalysisResult.Yes) { if (ShouldBeCallerMemberName(parameter, out var parameterSyntax)) { context.ReportDiagnostic(Diagnostic.Create(Descriptors.INPC004UseCallerMemberName, parameterSyntax !.GetLocation())); } if (ShouldBeProtected() is { } location) { context.ReportDiagnostic( Diagnostic.Create( Descriptors.INPC018InvokerShouldBeProtected, location)); } } else if (TrySet.IsMatch(method, context.SemanticModel, context.CancellationToken, out _, out _, out parameter) == AnalysisResult.Yes) { if (ShouldBeCallerMemberName(parameter, out var parameterSyntax)) { context.ReportDiagnostic(Diagnostic.Create(Descriptors.INPC004UseCallerMemberName, parameterSyntax !.GetLocation())); } if (ShouldBeProtected() is { } location) { context.ReportDiagnostic( Diagnostic.Create( Descriptors.INPC018InvokerShouldBeProtected, location)); } } } bool ShouldBeCallerMemberName(IParameterSymbol candidate, out ParameterSyntax?parameterSyntax) { parameterSyntax = null; return(!candidate.IsCallerMemberName() && candidate.Type == KnownSymbol.String && methodDeclaration.TryFindParameter(candidate.Name, out parameterSyntax) && CallerMemberNameAttribute.IsAvailable(context.SemanticModel)); } Location?ShouldBeProtected() { if (method is { DeclaredAccessibility : Accessibility.Private, ContainingType : { IsSealed : false, IsStatic : false } })
private static void Handle(SyntaxNodeAnalysisContext context) { if (!context.IsExcludedFromAnalysis() && context.Node is ArgumentSyntax { Parent : ArgumentListSyntax argumentList } argument) { if (argument.TryGetStringValue(context.SemanticModel, context.CancellationToken, out var text)) { if (text == ContainingSymbolName(context.ContainingSymbol) && context.SemanticModel.GetSymbolSafe(argumentList.Parent, context.CancellationToken) is IMethodSymbol method && method.TryFindParameter(argument, out var parameter)) { if (parameter.IsCallerMemberName()) { context.ReportDiagnostic(Diagnostic.Create(Descriptors.INPC004UseCallerMemberName, argument.GetLocation())); } else if (parameter.TrySingleDeclaration <SyntaxNode>(context.CancellationToken, out _) && OnPropertyChanged.IsMatch(method, context.SemanticModel, context.CancellationToken) == AnalysisResult.Yes) { context.ReportDiagnostic(Diagnostic.Create(Descriptors.INPC004UseCallerMemberName, argument.GetLocation())); } } if (SyntaxFacts.IsValidIdentifier(text)) { if (argumentList.Parent is InvocationExpressionSyntax onPropertyChangedCandidate && OnPropertyChanged.IsMatch(onPropertyChangedCandidate, context.SemanticModel, context.CancellationToken) != AnalysisResult.No && !context.ContainingSymbol.ContainingType.TryFindPropertyRecursive(text, out _)) { context.ReportDiagnostic(Diagnostic.Create(Descriptors.INPC009DoNotRaiseChangeForMissingProperty, argument.GetLocation())); } if (argumentList.Parent is ObjectCreationExpressionSyntax { Parent : ArgumentSyntax parentArg } objectCreation&& parentArg.FirstAncestor <InvocationExpressionSyntax>() is { } parentInvocation&& context.SemanticModel.TryGetSymbol(objectCreation, KnownSymbol.PropertyChangedEventArgs, context.CancellationToken, out _)) { if ((OnPropertyChanged.IsMatch(parentInvocation, context.SemanticModel, context.CancellationToken) != AnalysisResult.No || PropertyChangedEvent.IsInvoke(parentInvocation, context.SemanticModel, context.CancellationToken)) && !context.ContainingSymbol.ContainingType.TryFindPropertyRecursive(text, out _)) { context.ReportDiagnostic(Diagnostic.Create(Descriptors.INPC009DoNotRaiseChangeForMissingProperty, argument.GetLocation())); } } if (argument.Expression is LiteralExpressionSyntax literal && literal.IsKind(SyntaxKind.StringLiteralExpression)) { if (context.ContainingSymbol is IMethodSymbol containingMethod && containingMethod.Parameters.TrySingle(x => x.Name == literal.Token.ValueText, out _)) { context.ReportDiagnostic(Diagnostic.Create(Descriptors.INPC013UseNameof, argument.GetLocation())); } if (context.ContainingSymbol.ContainingType.TryFindPropertyRecursive(literal.Token.ValueText, out _)) { context.ReportDiagnostic(Diagnostic.Create(Descriptors.INPC013UseNameof, argument.GetLocation())); } } } } if (argument is { Expression : AnonymousFunctionExpressionSyntax lambda } &&
protected override async Task RegisterCodeFixesAsync(DocumentEditorCodeFixContext context) { var syntaxRoot = await context.Document.GetSyntaxRootAsync(context.CancellationToken) .ConfigureAwait(false); var semanticModel = await context.Document.GetSemanticModelAsync(context.CancellationToken) .ConfigureAwait(false); foreach (var diagnostic in context.Diagnostics) { if (syntaxRoot.TryFindNodeOrAncestor(diagnostic, out PropertyDeclarationSyntax? propertyDeclaration) && propertyDeclaration.Parent is ClassDeclarationSyntax classDeclarationSyntax && semanticModel.TryGetSymbol(classDeclarationSyntax, context.CancellationToken, out var type)) { if (TrySet.TryFind(type, semanticModel, context.CancellationToken, out var trySetMethod) && TrySet.CanCreateInvocation(trySetMethod, out _)) { if (Property.IsMutableAutoProperty(propertyDeclaration, out var getter, out var setter)) { context.RegisterCodeFix( trySetMethod.DisplaySignature(), (editor, cancellationToken) => TrySet(editor, cancellationToken), trySetMethod.MetadataName, diagnostic); async Task TrySet(DocumentEditor editor, CancellationToken cancellationToken) { var fieldAccess = await editor.AddBackingFieldAsync(propertyDeclaration, cancellationToken) .ConfigureAwait(false); var trySet = await editor.TrySetInvocationAsync(trySetMethod, fieldAccess, InpcFactory.Value, propertyDeclaration, cancellationToken) .ConfigureAwait(false); _ = editor.ReplaceNode( getter, x => x.AsExpressionBody(fieldAccess)) .ReplaceNode( setter, x => x.AsExpressionBody(trySet)); if (propertyDeclaration.Initializer != null) { editor.ReplaceNode( propertyDeclaration, (node, g) => ((PropertyDeclarationSyntax)node).WithoutInitializer()); } _ = editor.FormatNode(propertyDeclaration); } } else if (IsSimpleAssignmentOnly(propertyDeclaration, out _, out var assignment)) { context.RegisterCodeFix( trySetMethod.DisplaySignature(), async(editor, cancellationToken) => { var trySet = await editor.TrySetInvocationAsync(trySetMethod, assignment.Left, assignment.Right, propertyDeclaration, cancellationToken) .ConfigureAwait(false); _ = editor.ReplaceNode( assignment, x => trySet); }, trySetMethod.MetadataName, diagnostic); } } if (OnPropertyChanged.TryFind(type, semanticModel, context.CancellationToken, out var invoker) && invoker.Parameters.TrySingle(out var parameter) && parameter.Type.IsEither(KnownSymbol.String, KnownSymbol.PropertyChangedEventArgs)) { if (Property.IsMutableAutoProperty(propertyDeclaration, out var getter, out var setter) && semanticModel.TryGetSymbol(propertyDeclaration, context.CancellationToken, out var property)) { context.RegisterCodeFix( NotifyWhenValueChanges, (editor, cancellationToken) => NotifyWhenValueChangesAsync(editor, cancellationToken), nameof(NotifyWhenValueChangesAsync), diagnostic); async Task NotifyWhenValueChangesAsync(DocumentEditor editor, CancellationToken cancellationToken) { var backingField = await editor.AddBackingFieldAsync(propertyDeclaration, cancellationToken) .ConfigureAwait(false); var onPropertyChanged = await editor.OnPropertyChangedInvocationStatementAsync(invoker, propertyDeclaration, cancellationToken) .ConfigureAwait(false); _ = editor.ReplaceNode( getter, x => x.AsExpressionBody(backingField) .WithTrailingLineFeed()); _ = editor.ReplaceNode( setter, x => x.AsBlockBody( InpcFactory.IfReturn( InpcFactory.Equals(property.Type, InpcFactory.Value, backingField, editor.SemanticModel)), SyntaxFactory.ExpressionStatement(SyntaxFactory.AssignmentExpression(SyntaxKind.SimpleAssignmentExpression, backingField, InpcFactory.Value)), onPropertyChanged)); if (propertyDeclaration.Initializer != null) { _ = editor.ReplaceNode( propertyDeclaration, x => x.WithoutInitializer()); } _ = editor.FormatNode(propertyDeclaration); } }
/// <inheritdoc/> protected override async Task RegisterCodeFixesAsync(DocumentEditorCodeFixContext context) { var syntaxRoot = await context.Document.GetSyntaxRootAsync(context.CancellationToken) .ConfigureAwait(false); var semanticModel = await context.Document.GetSemanticModelAsync(context.CancellationToken) .ConfigureAwait(false); foreach (var diagnostic in context.Diagnostics) { if (diagnostic.Properties.TryGetValue(MutationAnalyzer.PropertyNameKey, out var propertyName)) { if (syntaxRoot.TryFindNodeOrAncestor(diagnostic, out ExpressionSyntax? expression) && expression.TryFirstAncestor(out ClassDeclarationSyntax? classDeclaration) && semanticModel.TryGetNamedType(classDeclaration, context.CancellationToken, out var type) && OnPropertyChanged.TryFind(type, semanticModel, context.CancellationToken, out var onPropertyChangedMethod) && onPropertyChangedMethod.Parameters.TrySingle(out var parameter) && parameter.Type.IsEither(KnownSymbol.String, KnownSymbol.PropertyChangedEventArgs)) { if (expression is InvocationExpressionSyntax trySet && semanticModel.TryGetSymbol(trySet, context.CancellationToken, out var trySetMethod) && TrySet.IsMatch(trySetMethod, semanticModel, context.CancellationToken) != AnalysisResult.No) { switch (trySet.Parent) { case ExpressionStatementSyntax expressionStatement: context.RegisterCodeFix( $"Notify that property {propertyName} changes.", async(editor, cancellationToken) => { var onPropertyChangedStatement = await editor.OnPropertyChangedInvocationStatementAsync(onPropertyChangedMethod, propertyName, cancellationToken) .ConfigureAwait(false); editor.ReplaceNode( expressionStatement, InpcFactory.IfStatement( trySet, onPropertyChangedStatement)); if (expressionStatement.TryFirstAncestor(out AccessorDeclarationSyntax? setter)) { _ = editor.FormatNode(setter); } }, nameof(NotifyForDependentPropertyFix), diagnostic); break; case ArrowExpressionClauseSyntax { Parent: AccessorDeclarationSyntax setter } : context.RegisterCodeFix( $"Notify that property {propertyName} changes.", async(editor, cancellationToken) => { var onPropertyChangedStatement = await editor.OnPropertyChangedInvocationStatementAsync(onPropertyChangedMethod, propertyName, cancellationToken) .ConfigureAwait(false); _ = editor.ReplaceNode( setter, x => x.AsBlockBody( InpcFactory.IfStatement( trySet, onPropertyChangedStatement))); }, nameof(NotifyForDependentPropertyFix), diagnostic); break;