private static void Analyze(SyntaxNodeAnalysisContext context, INamedTypeSymbol targetsAttribute)
{
if (context.Node is not SimpleBaseTypeSyntax s)
{
return;
}
if (context.ContainingSymbol is not INamedTypeSymbol symbol || !(symbol.TypeKind is TypeKind.Class or TypeKind.Struct or TypeKind.Interface))
{
return;
}
if (context.SemanticModel.GetSymbolInfo(s.Type).Symbol is not INamedTypeSymbol target || target.TypeKind != TypeKind.Interface)
{
return;
}
if (target.GetAttribute(targetsAttribute) is not AttributeData attr || !attr.TryGetConstructorArgumentValue(0, out int value))
{
return;
}
IntfTargets targets = (IntfTargets)value;
HandleTargets(context, targets, symbol);
}
private static void HandleTargets(SyntaxNodeAnalysisContext context, IntfTargets targets, INamedTypeSymbol intf)
{
if (targets == IntfTargets.ReflectionOnly)
{
context.ReportDiagnostic(Diagnostic.Create(DUR0403_InterfaceIsNotDirectlyAccessible, context.Node.GetLocation(), context.ContainingSymbol, intf));
return;
}
switch (intf.TypeKind)
{
case TypeKind.Interface:
if (!targets.HasFlag(IntfTargets.Interface))
{
context.ReportDiagnostic(Diagnostic.Create(DUR0402_InterfaceCannotBeBaseOfAnotherInterface, context.Node.GetLocation(), context.ContainingSymbol, intf));
}
break;
case TypeKind.Struct:
if (intf.IsRecord)
{
if (!targets.HasFlag(IntfTargets.RecordStruct))
{
ReportCannotBeImplemented(context, intf, "a record struct");
}
}
else
{
if (!targets.HasFlag(IntfTargets.Struct))
{
ReportCannotBeImplemented(context, intf, "a struct");
}
}
break;
case TypeKind.Class:
if (intf.IsRecord)
{
if (!targets.HasFlag(IntfTargets.RecordClass))
{
ReportCannotBeImplemented(context, intf, "a record class");
}
}
else
{
if (!targets.HasFlag(IntfTargets.Class))
{
ReportCannotBeImplemented(context, intf, "a class");
}
}
break;
}
}