class SassC::Engine

def post_process_source_map(source_map)
  return unless source_map
  data = JSON.parse(source_map)
  data['sources'].map! do |source|
    if source.start_with? 'file:'
      relative_path(Dir.pwd, Util.file_url_to_path(source))
    else
      source
    end
  end
  -JSON.generate(data)
end