[Objective-C][Swift]한글 풀어쓰기

@interface NSString (Hangul)

- (NSString *)linearHangul;

@end

@implementation NSString (Hangul)

- (NSString *)linearHangul {
	NSArray<NSArray<NSString *> *> *hangul = @[@[@"ㄱ",@"ㄲ",@"ㄴ",@"ㄷ",@"ㄸ",@"ㄹ",@"ㅁ",@"ㅂ",@"ㅃ",@"ㅅ",@"ㅆ",@"ㅇ",@"ㅈ",@"ㅉ",@"ㅊ",@"ㅋ",@"ㅌ",@"ㅍ",@"ㅎ"],
											   @[@"ㅏ",@"ㅐ",@"ㅑ",@"ㅒ",@"ㅓ",@"ㅔ",@"ㅕ",@"ㅖ",@"ㅗ",@"ㅘ",@"ㅙ",@"ㅚ",@"ㅛ",@"ㅜ",@"ㅝ",@"ㅞ",@"ㅟ",@"ㅠ",@"ㅡ",@"ㅢ",@"ㅣ"],
											   @[@"",@"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"]];
	NSString *result = @"";
	for (NSInteger i = 0;i < self.length; i++) {
		NSInteger code = [self characterAtIndex:i] - 44032;
		if (code > -1 && code < 11172) {
			NSInteger choIdx = code / 21 / 28;
			NSInteger jungIdx = code % (21 * 28) / 28;
			NSInteger jongIdx = code % 28;
			result = [NSString stringWithFormat:@"%@%@%@%@", result, hangul[0][choIdx], hangul[1][jungIdx], hangul[2][jongIdx]];
		}
		else {
			result = [result stringByAppendingString:[NSString stringWithFormat:@"%C", [self characterAtIndex:i]]];
		}
	}
	return result;
}

@end

// Using
[@"한글ABC" linearHangul];	// ㅎㅏㄴㄱㅡㄹABC
@"한글ABC".linearHangul;		// ㅎㅏㄴㄱㅡㄹABC

extension String {
    var hangul: String {
        get {
            let hangle = [
                ["ㄱ","ㄲ","ㄴ","ㄷ","ㄸ","ㄹ","ㅁ","ㅂ","ㅃ","ㅅ","ㅆ","ㅇ","ㅈ","ㅉ","ㅊ","ㅋ","ㅌ","ㅍ","ㅎ"],
                ["ㅏ","ㅐ","ㅑ","ㅒ","ㅓ","ㅔ","ㅕ","ㅖ","ㅗ","ㅘ","ㅙ","ㅚ","ㅛ","ㅜ","ㅝ","ㅞ","ㅟ","ㅠ","ㅡ","ㅢ","ㅣ"],
                ["","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"]
            ]

            return characters.reduce("") { result, char in
                if case let code = Int(String(char).unicodeScalars.reduce(0){$0.0 + $0.1.value}) - 44032
                    where code > -1 && code < 11172 {
                        let cho = code / 21 / 28, jung = code % (21 * 28) / 28, jong = code % 28;
                        return result + hangle[0][cho] + hangle[1][jung] + hangle[2][jong]
                }
                return result + String(char)
            }
        }
    }
}

// Test
assert("ㅎㅏㄴㄱㅡㄹABㅅㅔㅈㅗㅇ" == "한글AB세종".hangul)
assert("ABCDㅎㅏㄴㄱㅡㄹAD" == "ABCD한글AD".hangul)