module ActionView::Rendering

def _determine_template(options) #:nodoc:

:nodoc:
Determine the template to be rendered using the given options. 
def _determine_template(options) #:nodoc:
  if options.key?(:inline)
    handler = Template.handler_class_for_extension(options[:type] || "erb")
    Template.new(options[:inline], "inline template", handler, {})
  elsif options.key?(:text)
    Template::Text.new(options[:text], formats.try(:first))
  elsif options.key?(:file)
    with_fallbacks { find_template(options[:file], options[:prefix]) }
  elsif options.key?(:template)
    options[:template].respond_to?(:render) ?
      options[:template] : find_template(options[:template], options[:prefix])
  end
end

def _render_template(template, layout = nil, options = {}) #:nodoc:

:nodoc:
supplied as well.
Renders the given template. An string representing the layout can be 
def _render_template(template, layout = nil, options = {}) #:nodoc:
  locals = options[:locals] || {}
  layout = find_layout(layout) if layout
  ActiveSupport::Notifications.instrument("render_template.action_view",
    :identifier => template.identifier, :layout => layout.try(:virtual_path)) do
    content = template.render(self, locals) { |*name| _layout_for(*name) }
    @_content_for[:layout] = content if layout
    content = _render_layout(layout, locals) if layout
    content
  end
end

def render(options = {}, locals = {}, &block)

as the locals hash.
If no options hash is passed or :update specified, the default is to render a partial and use the second parameter

* :text - Renders the text passed in out.
* :inline - Renders an inline template similar to how it's done in the controller.
* :file - Renders an explicit template file (this used to be the old default), add :locals to pass in those.
* :update - Calls update_page with the block given.
* :partial - See ActionView::Partials.

Returns the result of a render that's dictated by the options hash. The primary options are: 
def render(options = {}, locals = {}, &block)
  case options
  when Hash
    if block_given?
      _render_partial(options.merge(:partial => options.delete(:layout)), &block)
    elsif options.key?(:partial)
      _render_partial(options)
    else
      template = _determine_template(options)
      lookup_context.freeze_formats(template.formats, true)
      _render_template(template, options[:layout], options)
    end
  when :update
    update_page(&block)
  else
    _render_partial(:partial => options, :locals => locals)
  end
end