public override DifferenceType Diff(IDifferences differences, ITypeDefinitionMember impl, ITypeDefinitionMember contract)
{
if (impl == null || contract == null)
{
return(DifferenceType.Unknown);
}
// If implementation is public then contract can be any visibility
if (impl.Visibility == TypeMemberVisibility.Public)
{
return(DifferenceType.Unknown);
}
// If implementation is protected or protected internal then contract must be protected or protected internal as well.
if (impl.Visibility == TypeMemberVisibility.Family || impl.Visibility == TypeMemberVisibility.FamilyOrAssembly)
{
if (contract.Visibility != TypeMemberVisibility.Family && contract.Visibility != TypeMemberVisibility.FamilyOrAssembly)
{
differences.AddIncompatibleDifference(this,
$"Visibility of member '{impl.FullName()}' is '{impl.GetVisibilityName()}' in the {Implementation} but '{contract.GetVisibilityName()}' in the {Contract}.");
return(DifferenceType.Changed);
}
}
return(DifferenceType.Unknown);
}