class ActionView::TemplateRenderer

def determine_template(options) #:nodoc:
  keys = options.fetch(:locals, {}).keys
  if options.key?(:body)
    Template::Text.new(options[:body])
  elsif options.key?(:text)
    Template::Text.new(options[:text], formats.first)
  elsif options.key?(:plain)
    Template::Text.new(options[:plain])
  elsif options.key?(:html)
    Template::HTML.new(options[:html], formats.first)
  elsif options.key?(:file)
    with_fallbacks { find_template(options[:file], nil, false, keys, @details) }
  elsif options.key?(:inline)
    handler = Template.handler_for_extension(options[:type] || "erb")
    Template.new(options[:inline], "inline template", handler, :locals => keys)
  elsif options.key?(:template)
    if options[:template].respond_to?(:render)
      options[:template]
    else
      find_template(options[:template], options[:prefixes], false, keys, @details)
    end
  else
    raise ArgumentError, "You invoked render but did not give any of :partial, :template, :inline, :file, :plain, :text or :body option."
  end
end