Convert to Zenkaku | Hankaku test

convert.rb

require 'nkf'

class Convert
  def self.to_han(text)
    puts "----- to_han -----"
    print_cp(text)
    text = NKF.nkf('-wZ0', text)
    print_cp(text)
  end

  def self.to_zen(text)
    puts "----- to_zen -----"
    print_cp(text)
    # ASCII文字種を一度半角文字にして揃える
    text = NKF.nkf('-wZ0', text)
    # 半角英数字記号（ASCII）を全角英数字記号に変換
    text = text.tr("!-~\s", "！-～　")
    print_cp(text)
  end

  private

  def self.print_cp(text)
    p text
    text.each_codepoint {|cp| $stdout << "U+" << cp.to_s(16) << " " }
    $stdout << "\n"
  end
end

data = ARGV[0]

Convert.to_han(data)
Convert.to_zen(data)