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require "active_support/core_ext/object/try"
module ActionView
class TemplateRenderer < AbstractRenderer #:nodoc:
def render(context, options)
@view = context
@details = extract_details(options)
template = determine_template(options)
prepend_formats(template.formats)
@lookup_context.rendered_format ||= (template.formats.first || formats.first)
render_template(template, options[:layout], options[:locals])
end
private
# Determine the template to be rendered using the given options.
def determine_template(options)
keys = options.has_key?(:locals) ? options[:locals].keys : []
if options.key?(:body)
Template::Text.new(options[:body])
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_file(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, :html or :body option."
end
end
# Renders the given template. A string representing the layout can be
# supplied as well.
def render_template(template, layout_name = nil, locals = nil)
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)
layout = path && find_layout(path, locals.keys, [formats.first])
content = yield(layout)
if layout
view = @view
view.view_flow.set(: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, formats)
resolve_layout(layout, keys, formats)
end
def resolve_layout(layout, keys, formats)
details = @details.dup
details[:formats] = formats
case layout
when String
begin
if layout.start_with?("/")
with_fallbacks { find_template(layout, nil, false, [], details) }
else
find_template(layout, nil, false, [], details)
end
rescue ActionView::MissingTemplate
all_details = @details.merge(formats: @lookup_context.default_formats)
raise unless template_exists?(layout, nil, false, [], all_details)
end
when Proc
resolve_layout(layout.call(formats), keys, formats)
else
layout
end
end
end
end
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