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require 'set'
require 'active_support/core_ext/object/try'
require 'active_support/core_ext/array/wrap'
require 'action_view/renderer/abstract_renderer'
module ActionView
class TemplateRenderer < AbstractRenderer #:nodoc:
attr_reader :rendered
def initialize(view)
super
@rendered = Set.new
end
def render(options)
wrap_formats(options[:template] || options[:file]) do
template = determine_template(options)
render_template(template, options[:layout], options[:locals])
end
end
def render_once(options)
paths, locals = options[:once], options[:locals] || {}
layout, keys = options[:layout], locals.keys
prefix = options.fetch(:prefix, @view.controller_prefix)
raise "render :once expects a String or an Array to be given" unless paths
render_with_layout(layout, locals) do
contents = []
Array.wrap(paths).each do |path|
template = find_template(path, prefix, false, keys)
contents << render_template(template, nil, locals) if @rendered.add?(template)
end
contents.join("\n")
end
end
# Determine the template to be rendered using the given options.
def determine_template(options) #:nodoc:
keys = options[:locals].try(:keys) || []
if options.key?(:text)
Template::Text.new(options[:text], formats.try(:first))
elsif options.key?(:file)
with_fallbacks { find_template(options[:file], options[:prefix], false, keys) }
elsif options.key?(:inline)
handler = Template.handler_class_for_extension(options[:type] || "erb")
Template.new(options[:inline], "inline template", handler, :locals => keys)
elsif options.key?(:template)
options[:template].respond_to?(:render) ?
options[:template] : find_template(options[:template], options[:prefix], false, keys)
end
end
# Renders the given template. An string representing the layout can be
# supplied as well.
def render_template(template, layout_name = nil, locals = {}) #:nodoc:
freeze_formats(template.formats, true)
view, locals = @view, locals || {}
render_with_layout(layout_name, locals) do |layout|
instrument(:template, :identifier => template.identifier, :layout => layout.try(:virtual_path)) do
template.render(view, locals) { |*name| view._layout_for(*name) }
end
end
end
def render_with_layout(path, locals) #:nodoc:
layout = path && find_layout(path, locals.keys)
content = yield(layout)
if layout
view = @view
view.store_content_for(:layout, content)
layout.render(view, locals){ |*name| view._layout_for(*name) }
else
content
end
end
# This is the method which actually finds the layout using details in the lookup
# context object. If no layout is found, it checks if at least a layout with
# the given name exists across all details before raising the error.
def find_layout(layout, keys)
begin
with_layout_format do
layout =~ /^\// ?
with_fallbacks { find_template(layout, nil, false, keys) } : find_template(layout, nil, false, keys)
end
rescue ActionView::MissingTemplate => e
update_details(:formats => nil) do
raise unless template_exists?(layout)
end
end
end
end
end
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