class RDoc::I18n::Text

def translate(locale)
  translated_text = ''
  parse do |part|
    case part[:type]
    when :paragraph
      translated_text += locale.translate(part[:paragraph])
    when :empty_line
      translated_text += part[:line]
    else
      raise "should not reach here: unexpected type: #{type}"
    end
  end
  translated_text
end