module ActionController::Rendering

def _normalize_args(action = nil, options = {}, &blk)
  options = super
  options[:update] = blk if block_given?
  options
end

def _normalize_options(options)
  _normalize_text(options)
  if options[:html]
    options[:html] = ERB::Util.html_escape(options[:html])
  end
  if options[:status]
    options[:status] = Rack::Utils.status_code(options[:status])
  end
  super
end

def _normalize_text(options)
  RENDER_FORMATS_IN_PRIORITY.each do |format|
    if options.key?(format) && options[format].respond_to?(:to_text)
      options[format] = options[format].to_text
    end
  end
end

def _process_options(options)
  status, content_type, location = options.values_at(:status, :content_type, :location)
  self.status = status if status
  self.content_type = content_type if content_type
  headers["Location"] = url_for(location) if location
  super
end

def _process_variant(options)
  if defined?(request) && !request.nil? && request.variant.present?
    options[:variant] = request.variant
  end
end

def _render_in_priorities(options)
  RENDER_FORMATS_IN_PRIORITY.each do |format|
    return options[format] if options.key?(format)
  end
  nil
end

def _set_html_content_type
  self.content_type = Mime[:html].to_s
end

def _set_rendered_content_type(format)
  if format && !response.media_type
    self.content_type = format.to_s
  end
end

def _set_vary_header
  if response.headers["Vary"].blank? && request.should_apply_vary_header?
    response.headers["Vary"] = "Accept"
  end
end

def process_action(*) # :nodoc:
  self.formats = request.formats.filter_map(&:ref)
  super
end

def render(*args) # :nodoc:
  raise ::AbstractController::DoubleRenderError if response_body
  super
end

def render_to_body(options = {})
  super || _render_in_priorities(options) || " "
end

def render_to_string(*)
  result = super
  if result.respond_to?(:each)
    string = +""
    result.each { |r| string << r }
    string
  else
    result
  end
end