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# frozen_string_literal: true
require_relative "error"
require "action_view"
require "action_view/view_paths"
require "set"
module AbstractController
class DoubleRenderError < Error
DEFAULT_MESSAGE = "Render and/or redirect were called multiple times in this action. Please note that you may only call render OR redirect, and at most once per action. Also note that neither redirect nor render terminate execution of the action, so if you want to exit an action after redirecting, you need to do something like \"redirect_to(...) and return\"."
def initialize(message = nil)
super(message || DEFAULT_MESSAGE)
end
end
module Rendering
extend ActiveSupport::Concern
include ActionView::ViewPaths
# Normalizes arguments, options and then delegates render_to_body and
# sticks the result in <tt>self.response_body</tt>.
def render(*args, &block)
options = _normalize_render(*args, &block)
rendered_body = render_to_body(options)
if options[:html]
_set_html_content_type
else
_set_rendered_content_type rendered_format
end
self.response_body = rendered_body
end
# Raw rendering of a template to a string.
#
# It is similar to render, except that it does not
# set the +response_body+ and it should be guaranteed
# to always return a string.
#
# If a component extends the semantics of +response_body+
# (as ActionController extends it to be anything that
# responds to the method each), this method needs to be
# overridden in order to still return a string.
def render_to_string(*args, &block)
options = _normalize_render(*args, &block)
render_to_body(options)
end
# Performs the actual template rendering.
def render_to_body(options = {})
end
# Returns Content-Type of rendered content.
def rendered_format
Mime[:text]
end
DEFAULT_PROTECTED_INSTANCE_VARIABLES = Set.new %i(
@_action_name @_response_body @_formats @_prefixes
)
# This method should return a hash with assigns.
# You can overwrite this configuration per controller.
def view_assigns
protected_vars = _protected_ivars
variables = instance_variables
variables.reject! { |s| protected_vars.include? s }
variables.each_with_object({}) { |name, hash|
hash[name.slice(1, name.length)] = instance_variable_get(name)
}
end
private
# Normalize args by converting <tt>render "foo"</tt> to
# <tt>render :action => "foo"</tt> and <tt>render "foo/bar"</tt> to
# <tt>render :file => "foo/bar"</tt>.
def _normalize_args(action = nil, options = {})
if action.respond_to?(:permitted?)
if action.permitted?
action
else
raise ArgumentError, "render parameters are not permitted"
end
elsif action.is_a?(Hash)
action
else
options
end
end
# Normalize options.
def _normalize_options(options)
options
end
# Process extra options.
def _process_options(options)
options
end
# Process the rendered format.
def _process_format(format) # :nodoc:
end
def _process_variant(options)
end
def _set_html_content_type # :nodoc:
end
def _set_rendered_content_type(format) # :nodoc:
end
# Normalize args and options.
def _normalize_render(*args, &block) # :nodoc:
options = _normalize_args(*args, &block)
_process_variant(options)
_normalize_options(options)
options
end
def _protected_ivars # :nodoc:
DEFAULT_PROTECTED_INSTANCE_VARIABLES
end
end
end