def css_classes_for_map(classname, mapping)
      css = mapping[classname]
      css.class == String ? css_classes_for_map(css, mapping) : (css || [])
    end
def css_classes_for_map(classname, mapping)
      css = mapping[classname]
      css.class == String ? css_classes_for_map(css, mapping) : (css || [])
    end
Internal method to get mapping from selected map.