module RSpec::Rails::ViewExampleGroup::ExampleMethods

def _default_render_options
  formats = if ActionView::Template::Types.respond_to?(:symbols)
              ActionView::Template::Types.symbols
            else
              [:html, :text, :js, :css, :xml, :json].map(&:to_s)
            end.map { |x| Regexp.escape(x) }.join("|")
  handlers = ActionView::Template::Handlers.extensions.map { |x| Regexp.escape(x) }.join("|")
  locales = "[a-z]{2}(?:-[A-Z]{2})?"
  variants = "[^.]*"
  path_regex = %r{
  \A
  (?<template>.*?)
  (?:\.(?<locale>#{locales}))??
    (?:\.(?<format>#{formats}))??
    (?:\+(?<variant>#{variants}))??
    (?:\.(?<handler>#{handlers}))?
    \z
  }x
  # This regex should always find a match.
  # Worst case, everything will be nil, and :template will just be
  # the original string.
  match = path_regex.match(_default_file_to_render)
  render_options = {template: match[:template]}
  render_options[:handlers] = [match[:handler]] if match[:handler]
  render_options[:formats] = [match[:format].to_sym] if match[:format]
  render_options[:locales] = [match[:locale]] if match[:locale]
  render_options[:variants] = [match[:variant]] if match[:variant]
  render_options
end