Rails 3.1 CSS compressor to replace url(asset.png) with real asset path

css_asset_path_compressor.rb

class CssAssetPathCompressor
  include Sprockets::Helpers::RailsHelper
  ReplaceRexeg = /url\(["']?([^\)\?"']+)(\?[^"']*)?["']?\)/i

  def initialize(compressor)
    @compressor = compressor
  end

  def compress(css)
    rewrite(css)
    @compressor.compress(css)
  end

  protected

  def rewrite(css)
    css.gsub(ReplaceRexeg) do |match|
      rewrite_asset_url(match)
    end
  end

  def rewrite_asset_url(match)
    if match[1]
      
    else
      
    end
  end

  def config
    Rails.application.config
  end
end