private static void Handle(SyntaxNodeAnalysisContext context)
{
if (!context.IsExcludedFromAnalysis() &&
context.ContainingSymbol is INamedTypeSymbol {
IsAbstract : false, IsStatic : false
} type&&
type.IsAssignableToEither(KnownSymbols.IValueConverter, KnownSymbols.IMultiValueConverter, context.SemanticModel.Compilation) &&
context.Node is ClassDeclarationSyntax classDeclaration &&
type.DeclaredAccessibility != Accessibility.Private &&
type.DeclaredAccessibility != Accessibility.Protected)
{
if (!type.IsAssignableTo(KnownSymbols.MarkupExtension, context.SemanticModel.Compilation))
{
if (ValueConverter.TryGetDefaultFieldsOrProperties(type, context.SemanticModel.Compilation, out var defaults))
{
foreach (var fieldOrProperty in defaults)
{
if (fieldOrProperty.Value(context.CancellationToken) is { } assignedValue&&
context.SemanticModel.TryGetType(assignedValue, context.CancellationToken, out var assignedType) &&
!TypeSymbolComparer.Equal(assignedType, type))
{
context.ReportDiagnostic(Diagnostic.Create(Descriptors.WPF0074DefaultMemberOfWrongType, assignedValue.GetLocation()));
}
}
}
else if (!Virtual.HasVirtualOrAbstractOrProtectedMembers(type) &&
!type.Constructors.TryFirst(x => x.Parameters.Length > 0, out _) &&
!Mutable.HasMutableInstanceMembers(type) &&
!classDeclaration.Modifiers.Any(SyntaxKind.PartialKeyword))
{
context.ReportDiagnostic(Diagnostic.Create(Descriptors.WPF0070ConverterDoesNotHaveDefaultField, classDeclaration.Identifier.GetLocation()));
}
}
if (type.IsAssignableTo(KnownSymbols.IValueConverter, context.SemanticModel.Compilation))
{
if (Attribute.TryFind(classDeclaration, KnownSymbols.ValueConversionAttribute, context.SemanticModel, context.CancellationToken, out var attribute))
{
if (ValueConverter.TryGetConversionTypes(classDeclaration, context.SemanticModel, context.CancellationToken, out var sourceType, out var targetType))
{
if (sourceType is { } &&
private static void Handle(SyntaxNodeAnalysisContext context)
{
if (!context.IsExcludedFromAnalysis() &&
context.ContainingSymbol is INamedTypeSymbol type &&
type.IsAssignableToEither(KnownSymbols.IValueConverter, KnownSymbols.IMultiValueConverter, context.Compilation) &&
context.Node is ClassDeclarationSyntax classDeclaration &&
!type.IsAbstract &&
type.DeclaredAccessibility != Accessibility.Private &&
type.DeclaredAccessibility != Accessibility.Protected)
{
if (!type.IsAssignableTo(KnownSymbols.MarkupExtension, context.Compilation))
{
if (ValueConverter.TryGetDefaultFieldsOrProperties(type, context.Compilation, out var defaults))
{
foreach (var fieldOrProperty in defaults)
{
if (fieldOrProperty.TryGetAssignedValue(context.CancellationToken, out var assignedValue) &&
context.SemanticModel.TryGetType(assignedValue, context.CancellationToken, out var assignedType) &&
!Equals(assignedType, type))
{
context.ReportDiagnostic(Diagnostic.Create(Descriptors.WPF0074DefaultMemberOfWrongType, assignedValue.GetLocation()));
}
}
}
else if (!Virtual.HasVirtualOrAbstractOrProtectedMembers(type) &&
!type.Constructors.TryFirst(x => x.Parameters.Length > 0, out _) &&
!Mutable.HasMutableInstanceMembers(type))
{
context.ReportDiagnostic(Diagnostic.Create(Descriptors.WPF0070ConverterDoesNotHaveDefaultField, classDeclaration.Identifier.GetLocation()));
}
}
if (type.IsAssignableTo(KnownSymbols.IValueConverter, context.Compilation))
{
if (Attribute.TryFind(classDeclaration, KnownSymbols.ValueConversionAttribute, context.SemanticModel, context.CancellationToken, out var attribute))
{
if (ValueConverter.TryGetConversionTypes(classDeclaration, context.SemanticModel, context.CancellationToken, out var sourceType, out var targetType))
{
if (sourceType != null &&
sourceType != QualifiedType.System.Object &&
attribute.TryFindArgument(0, "sourceType", out var arg) &&
arg.Expression is TypeOfExpressionSyntax sourceTypeOf &&
TypeOf.TryGetType(sourceTypeOf, type, context.SemanticModel, context.CancellationToken, out var argType) &&
!Equals(argType, sourceType))
{
context.ReportDiagnostic(Diagnostic.Create(Descriptors.WPF0072ValueConversionMustUseCorrectTypes, arg.GetLocation(), sourceType));
}
if (attribute.TryFindArgument(1, "targetType", out arg) &&
arg.Expression is TypeOfExpressionSyntax targetTypeOf &&
TypeOf.TryGetType(targetTypeOf, type, context.SemanticModel, context.CancellationToken, out argType) &&
!Equals(argType, targetType))
{
context.ReportDiagnostic(Diagnostic.Create(Descriptors.WPF0072ValueConversionMustUseCorrectTypes, arg.GetLocation(), targetType));
}
}
}
else
{
if (ValueConverter.TryGetConversionTypes(classDeclaration, context.SemanticModel, context.CancellationToken, out _, out _))
{
context.ReportDiagnostic(Diagnostic.Create(Descriptors.WPF0071ConverterDoesNotHaveAttribute, classDeclaration.Identifier.GetLocation()));
}
else
{
context.ReportDiagnostic(Diagnostic.Create(Descriptors.WPF0073ConverterDoesNotHaveAttributeUnknownTypes, classDeclaration.Identifier.GetLocation()));
}
}
}
}
}
