code: def _create_contextualvals_obj_from_context(cls, context):
          
          context_processor_vals = context.get('wagtailmenus_vals', {})
          return ContextualVals(
              context,
              context['request'],
              get_site_from_request(context['request']),
              context.get('current_level', 0) + 1,
              context.get('original_menu_tag', cls.related_templatetag_name),
              context.get('original_menu_instance'),
              context_processor_vals.get('current_page'),
              context_processor_vals.get('section_root'),
              context_processor_vals.get('current_page_ancestor_ids', ()),
          )
docs: Gathers all of the 'contextual' data needed to render a menu instance
          and returns it in a structure that can be conveniently referenced
          throughout the process of preparing the menu and menu items and
          for rendering.