split_korean.rb

# Transliterate-hacked from Perl
# http://blog.naver.com/PostView.nhn?blogId=mokomoji&logNo=130013133481

$KCODE = 'UTF8'

class String
    # I think in the original the text was forced to cp949...
    def split_korean
        # ㄱ      ㄲ      ㄴ      ㄷ      ㄸ      ㄹ      ㅁ      ㅂ      ㅃ      ㅅ      ㅆ      ㅇ      ㅈ      ㅉ      ㅊ      ㅋ      ㅌ      ㅍ      ㅎ
        chosung = [0x3131, 0x3132, 0x3134, 0x3137, 0x3138, 0x3139, 0x3141, 0x3142, 0x3143, 0x3145, 0x3146, 0x3147, 0x3148, 0x3149, 0x314a, 0x314b, 0x314c, 0x314d, 0x314e]


        # ㅏ      ㅐ      ㅑ      ㅒ      ㅓ      ㅔ      ㅕ      ㅖ      ㅗ      ㅘ      ㅙ      ㅚ      ㅛ      ㅜ      ㅝ      ㅞ      ㅟ      ㅠ      ㅡ      ㅢ      ㅣ
        jwungsung = [0x314f, 0x3150, 0x3151, 0x3152, 0x3153, 0x3154, 0x3155, 0x3156, 0x3157, 0x3158, 0x3159, 0x315a, 0x315b, 0x315c, 0x315d, 0x315e, 0x315f, 0x3160, 0x3161, 0x3162, 0x3163]

        #         ㄱ      ㄲ      ㄳ      ㄴ      ㄵ      ㄶ      ㄷ      ㄹ      ㄺ      ㄻ      ㄼ      ㄽ      ㄾ      ㄿ      ㅀ      ㅁ      ㅂ      ㅄ      ㅅ      ㅆ      ㅇ      ㅈ      ㅊ      ㅋ      ㅌ      ㅍ      ㅎ
        jongsung  = [ 0,      0x3131, 0x3132, 0x3133, 0x3134, 0x3135, 0x3136, 0x3137, 0x3139, 0x313a, 0x313b, 0x313c, 0x313d, 0x313e, 0x313f, 0x3140, 0x3141, 0x3142, 0x3144, 0x3145, 0x3146, 0x3147, 0x3148, 0x314a, 0x314b, 0x314c, 0x314d, 0x314e ]


        raw_chars = self.unpack("U*")

        result = Array.new

        raw_chars.each do |char|
            if (char >= 0xAC00 && char <= 0xD7A3)
                # Move it down in the range
                c = char - 0xAC00;

                # Here be dragons
                a = c.to_f / (21 * 28);
                c = c % (21 * 28);
                b = c.to_f / 28;
                c = c % 28;

                a = a.to_i
                b = b.to_i
                c = c.to_i

                result.push( chosung[a], jwungsung[b] )

                if c != 0
                    result.push( jongsung[c] )
                end
            else
                result.push(char)
            end
        end

        return result.pack("U*")

    end
end


p '안녕하세요'.split_korean