gistfile1.rb

class Page

  def self.from(path, method)
    env = Rack::MockRequest.env_for(path, method: method)
    request = ActionDispatch::Request.new(env)
    router = Journey::Router.new(Rails.application.routes.set, {
      parameters_key: ActionDispatch::Routing::RouteSet::PARAMETERS_KEY,
      request_class: ActionDispatch::Request
    })
    klass = nil

    router.recognize(request) do |route, matches, params|
      tokens = []
      action_class = params[:action].to_s.camelcase
      method_class = method.to_s.camelcase
      format_class = (params[:format] || 'html').to_s.camelcase

      route.path.spec.each_slice(3) do |segments|
        tokens << segments.detect do |segment|
          if segment.to_s.present?
            !(segment.to_s =~ (/\/|^:|^\.$|^\(?\.?\:format/))
          end
        end.to_s.camelcase
      end

      tokens.select!(&:present?).each do |token|
        if (klass || self).const_defined?(token, false)
          klass = (klass || self).const_get(token, false)
        end
      end

      if klass
        [action_class, method_class, format_class].each do |constant|
          if klass.const_defined?(constant, false)
            klass = klass.const_get(constant, false)
          else
            break
          end
        end
      end
    end
    klass || self
  end

end