Grab country phone codes out of Wikipedia article

country_phone_codes_wikipedia.rb

require 'nokogiri'
require 'open-uri'
require 'yaml'

doc = Nokogiri::HTML.parse(open("https://en.wikipedia.org/wiki/List_of_country_calling_codes"))

table = doc.css('table.wikitable').first

cells = table.css('td')

# put known overrides here. Last updated/analyzed 2020-11-12
data_hash = {
  'VA' => '379', # Vatican City is listed on wikipedia in both 379 and also in 39, which is Italy.
                  # stick with the more specific one
  'KZ' => '7', # Kazahkstan is listed also with +997 on wikipedia but these are only for SIM
              # cards ICCID
  'XV' => nil # refers to international networks that are outside of country boundaries
}

cells.each do |cell|
  if cell.text.strip.start_with?('+1: North American Numbering Plan countries and territories')
    # Find the country codes
    matches = cell.text.scan(/([A-Z]{2})/).flatten
    matches.each do |alpha2|
      if data_hash.key?(alpha2)
        #puts "duplicate #{alpha2}"
        next
      end
      data_hash[alpha2] = '1'
        #puts "#{alpha2} => 1"
    end
  elsif cell.text.strip.start_with?(/\+[2-9]/)
    next unless cell.text.strip.match?(/([A-Z]{2})/)

    code = cell.text.strip.split(':').first[1..-1]
    alpha2s = cell.text.strip.split(':').last.strip.split(', ')
    alpha2s.each do |alpha2|
      if data_hash.key?(alpha2)
        #puts "duplicate #{alpha2}"
        next
      end
      data_hash[alpha2] = code
        # puts "#{alpha2} => #{code}"
    end
  end
end

puts data_hash.sort.to_h.to_yaml