class Sprockets::SasscCompressor

def call(input)
  # SassC requires the template to be modifiable
  input_data = input[:data].frozen? ? input[:data].dup : input[:data]
  engine = Autoload::SassC::Engine.new(input_data, @options.merge(filename: input[:filename], source_map_file: "#{input[:filename]}.map")) 
    
  css = engine.render.sub(/^\n^\/\*# sourceMappingURL=.*\*\/$/m, '')
  begin
    map = SourceMapUtils.format_source_map(JSON.parse(engine.source_map), input)
    map = SourceMapUtils.combine_source_maps(input[:metadata][:map], map)
  rescue SassC::NotRenderedError
    map = input[:metadata][:map]
  end
  { data: css, map: map }
end

def initialize(options = {})
  @options = {
    syntax: :scss,
    style: :compressed,
    source_map_contents: false,
    omit_source_map_url: true,
  }.merge(options).freeze
end