Helper classes for tracking browser in rails application

browser_helper.rb

module BrowserClassHelper
  def browser_class
    if ie11?
      "is-ie11"
    else
      "is-" + request.browser.downcase
    end
  end

  def ie11?
    request.browser == "Internet Explorer" && request.browser_version.include?("11.")
  end

  def os_class
    return "is-windows" + request.os.sub!(/Windows /, "") if need_remove_windows?
    return "is-windows" + request.os if Woothee.parse(request.user_agent)[:vendor] == "Microsoft"
    return "is-mac" if request.os == "Mac OSX"
    return "is-ios" if request.from_ios?
    return "is-android" if android?
    return "is-windows-phone" if request.from_windows_phone?
    "is-other-os"
  end

  def css_hack_class
    browser_class + " " + os_class
  end

  private
    def need_remove_windows?
      Woothee.parse(request.user_agent)[:vendor] == "Microsoft" && request.os.include?("Windows")
    end

    def android?
      request.from_android? || request.from_android_tablet?
    end
end