IronRuby.Builtins.RubyModule.IsMethodVisible C# (CSharp) Метод

        private bool IsMethodVisible(RubyMemberInfo/*!*/ method, RubyModule/*!*/ owner, VisibilityContext visibility, bool foundCallerSelf) {
            // Visibility not constrained by a class:
            // - call with implicit self => all methods are visible.
            // - interop call => only public methods are visible.
            if (visibility.Class == null) {
                return visibility.IsVisible(method.Visibility);
            } 
            
            if (method.Visibility == RubyMethodVisibility.Protected) {
                // A protected method is visible if the caller's self immediate class is a descendant of the method owner.
                if (foundCallerSelf) {
                    return true;
                }
                // walk ancestors from caller's self class (visibilityContext)
                // until the method owner is found or this module is found (this module is a descendant of the owner):
                return visibility.Class.ForEachAncestor((module) => module == owner || module == this);
            } 

            return method.Visibility == RubyMethodVisibility.Public;
        }