module Sprockets::Compressing

def compressors
  config[:compressors]
end

def css_compressor
  if defined? @css_compressor
    @css_compressor
  end
end

def css_compressor=(compressor)
  unregister_bundle_processor 'text/css', @css_compressor if defined? @css_compressor
  @css_compressor = nil
  return unless compressor
  if compressor.is_a?(Symbol)
    @css_compressor = klass = config[:compressors]['text/css'][compressor] || raise(Error, "unknown compressor: #{compressor}")
  elsif compressor.respond_to?(:compress)
    klass = proc { |input| compressor.compress(input[:data]) }
    @css_compressor = :css_compressor
  else
    @css_compressor = klass = compressor
  end
  register_bundle_processor 'text/css', klass
end

def gzip=(gzip)
  self.config = config.merge(gzip_enabled: gzip).freeze
end

def gzip?
  config[:gzip_enabled]
end

def js_compressor
  if defined? @js_compressor
    @js_compressor
  end
end

def js_compressor=(compressor)
  unregister_bundle_processor 'application/javascript', @js_compressor if defined? @js_compressor
  @js_compressor = nil
  return unless compressor
  if compressor.is_a?(Symbol)
    @js_compressor = klass = config[:compressors]['application/javascript'][compressor] || raise(Error, "unknown compressor: #{compressor}")
  elsif compressor.respond_to?(:compress)
    klass = proc { |input| compressor.compress(input[:data]) }
    @js_compressor = :js_compressor
  else
    @js_compressor = klass = compressor
  end
  register_bundle_processor 'application/javascript', klass
end

def register_compressor(mime_type, sym, klass)
  self.config = hash_reassoc(config, :compressors, mime_type) do |compressors|
    compressors[sym] = klass
    compressors
  end
end

def skip_gzip?
  !gzip?
end