class IRB::Locale

def initialize(locale = nil)
  @override_encoding = nil
  @lang = @territory = @encoding_name = @modifier = nil
  @locale = locale || ENV["IRB_LANG"] || ENV["LC_MESSAGES"] || ENV["LC_ALL"] || ENV["LANG"] || "C"
  if m = LOCALE_NAME_RE.match(@locale)
    @lang, @territory, @encoding_name, @modifier = m[:language], m[:territory], m[:codeset], m[:modifier]
    if @encoding_name
      if @encoding = LEGACY_ENCODING_ALIAS_MAP[@encoding_name]
        warn(("%s is obsolete. use %s" % ["#{@lang}_#{@territory}.#{@encoding_name}", "#{@lang}_#{@territory}.#{@encoding.name}"]), uplevel: 1)
      else
        @encoding = Encoding.find(@encoding_name) rescue nil
      end
    end
  end
  @encoding ||= (Encoding.find('locale') rescue Encoding::ASCII_8BIT)
end