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# frozen_string_literal: true
module ActionView
# This class defines the interface for a renderer. Each class that
# subclasses +AbstractRenderer+ is used by the base +Renderer+ class to
# render a specific type of object.
#
# The base +Renderer+ class uses its +render+ method to delegate to the
# renderers. These currently consist of
#
# PartialRenderer - Used for rendering partials
# TemplateRenderer - Used for rendering other types of templates
# StreamingTemplateRenderer - Used for streaming
#
# Whenever the +render+ method is called on the base +Renderer+ class, a new
# renderer object of the correct type is created, and the +render+ method on
# that new object is called in turn. This abstracts the setup and rendering
# into a separate classes for partials and templates.
class AbstractRenderer #:nodoc:
delegate :template_exists?, :any_templates?, :formats, to: :@lookup_context
def initialize(lookup_context)
@lookup_context = lookup_context
end
def render
raise NotImplementedError
end
class RenderedCollection # :nodoc:
def self.empty(format)
EmptyCollection.new format
end
attr_reader :rendered_templates
def initialize(rendered_templates, spacer)
@rendered_templates = rendered_templates
@spacer = spacer
end
def body
@rendered_templates.map(&:body).join(@spacer.body).html_safe
end
def format
rendered_templates.first.format
end
class EmptyCollection
attr_reader :format
def initialize(format)
@format = format
end
def body; nil; end
end
end
class RenderedTemplate # :nodoc:
attr_reader :body, :layout, :template
def initialize(body, layout, template)
@body = body
@layout = layout
@template = template
end
def format
template.formats.first
end
EMPTY_SPACER = Struct.new(:body).new
end
private
def extract_details(options) # :doc:
@lookup_context.registered_details.each_with_object({}) do |key, details|
value = options[key]
details[key] = Array(value) if value
end
end
def instrument(name, **options) # :doc:
ActiveSupport::Notifications.instrument("render_#{name}.action_view", options) do |payload|
yield payload
end
end
def prepend_formats(formats) # :doc:
formats = Array(formats)
return if formats.empty? || @lookup_context.html_fallback_for_js
@lookup_context.formats = formats | @lookup_context.formats
end
def build_rendered_template(content, template, layout = nil)
RenderedTemplate.new content, layout, template
end
def build_rendered_collection(templates, spacer)
RenderedCollection.new templates, spacer
end
end
end
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