Extract ISO 3166 country codes from Wikipedia page using Ruby and Nokogiri

gistfile1.rb

# find all rows                                                                                                                                            
# for each table row                                                                                                                                       
# get first td a                                                                                                                                           
# get second td tt                                                                                                                                         
# get third td tt                                                                                                                                          
# get fourth td tt                                                                                                                                         
require 'nokogiri'

countries = []
File.open('ISO_3166-1.htm') do |f|
  doc = Nokogiri::HTML(f)
  rows = doc.xpath('//tr')
  for row in rows
    name_td = row.xpath('td').first
    unless name_td.nil?
      country_info = []
      country_info << name_td.xpath('.//a').text()
      iso2_td = name_td.next_element()
      country_info << iso2_td.xpath('a/tt').text()
      iso3_td = iso2_td.next_element()
      country_info << iso3_td.xpath('tt').text()
      isonumeric_td = iso3_td.next_element()
      country_info << isonumeric_td.xpath('tt').text()
      countries	<< country_info
    end
  end
end

puts countries