module Sprockets::Compressing

def compressors
  deep_copy_hash(@compressors)
end

def css_compressor
  @css_compressor if defined? @css_compressor
end

def css_compressor=(compressor)
  unregister_bundle_processor 'text/css', css_compressor if css_compressor
  @css_compressor = nil
  return unless compressor
  if compressor.is_a?(Symbol)
    compressor = compressors['text/css'][compressor] || raise(Error, "unknown compressor: #{compressor}")
  end
  if compressor.respond_to?(:compress)
    klass = Class.new(Processor) do
      @name = "css_compressor"
      @processor = proc { |context, data| compressor.compress(data) }
    end
    @css_compressor = :css_compressor
  else
    @css_compressor = klass = compressor
  end
  register_bundle_processor 'text/css', klass
end

def js_compressor
  @js_compressor if defined? @js_compressor
end

def js_compressor=(compressor)
  unregister_bundle_processor 'application/javascript', js_compressor if js_compressor
  @js_compressor = nil
  return unless compressor
  if compressor.is_a?(Symbol)
    compressor = compressors['application/javascript'][compressor] || raise(Error, "unknown compressor: #{compressor}")
  end
  if compressor.respond_to?(:compress)
    klass = Class.new(Processor) do
      @name = "js_compressor"
      @processor = proc { |context, data| compressor.compress(data) }
    end
    @js_compressor = :js_compressor
  else
    @js_compressor = klass = compressor
  end
  register_bundle_processor 'application/javascript', klass
end

def register_compressor(mime_type, sym, klass)
  @compressors[mime_type][sym] = klass
end