class SassC::Engine

def source_map_file_url
  @source_map_file_url ||= if source_map_file
                             Uri.path_to_file_url(File.absolute_path(source_map_file))
                                .gsub('%3F', '?') # https://github.com/sass-contrib/sassc-embedded-shim-ruby/pull/69
                           end
end