module JapaneseCharReal

# File lib/japanese_char_real.rb, line 38
def convert(str, encode: :ujis_to_utf8)
  return str if str.ascii_only?

  case encode
  when :ujis_to_utf8
    unless str.encoding.name == 'UTF-8'
      str.encode!(Encoding::UTF_8, fallback: -> c {
        self.utf8_failure[c.unpack('H*').first] || '?'
      })
    end
    str.split('').map { |c|
      self.gaiji_to_utf8[c.unpack('H*').first] || c
    }.join('')

  when :utf8_to_ujis
  end
end

# File lib/japanese_char_real.rb, line 31
def gaiji_to_utf8
  {
    'ee8b93' => '髙',
    'ee878c' => '﨑'
  }
end

# File lib/japanese_char_real.rb, line 5
def utf8_failure
  {
    '8ff3a1' => 'ⅰ',
    '8ff3a2' => 'ⅱ',
    '8ff3a3' => 'ⅲ',
    '8ff3a4' => 'ⅳ',
    '8ff3a5' => 'ⅴ',
    '8ff3a5' => 'ⅵ',
    '8ff3a7' => 'ⅶ',
    '8ff3a8' => 'ⅷ',
    '8ff3a9' => 'ⅸ',
    '8ff3aa' => 'ⅹ',
    '8ff3ab' => 'Ⅰ',
    '8ff3ac' => 'Ⅱ',
    '8ff3ad' => 'Ⅲ',
    '8ff3ae' => 'Ⅳ',
    '8ff3af' => 'Ⅴ',
    '8ff3b0' => 'Ⅵ',
    '8ff3b1' => 'Ⅶ',
    '8ff3b2' => 'Ⅷ',
    '8ff3b3' => 'Ⅸ',
    '8ff3b4' => 'Ⅹ',
    '8ff3b7' => '㈱'
  }
end