MS IME 호환 기능 추가: ㄳ 입력 기능 추가

원래 이 글자들은 유니코드 초성에 없는 글자들이라서 입력 기능을
제공하지 않았지만, MS IME 호환 기능을 요구하는 경우가 많아서
libhangul 수준에서 제공하기로 결정한다.
그래서 ㄳ은 초성이 결합하여 종성이 되도록 combination table을
만든다.

hangul/hangulinputcontext.c

@@ -954,6 +954,16 @@ hangul_ic_process_jamo(HangulInputContext *hic, ucschar ch)
 	if (hangul_is_choseong(ch)) {
 	    combined = hangul_combination_combine(hic->keyboard->combination,
 						  hic->buffer.choseong, ch);
+	    /* 초성을 입력한 combine 함수에서 종성이 나오게 된다면
+	     * 이전 초성도 종성으로 바꿔 주는 편이 나머지 처리에 편리하다.
+	     * 이 기능은 MS IME 호환기능으로 ㄳ을 입력하는데 사용한다. */
+	    if (hangul_is_jongseong(combined)) {
+		hic->buffer.choseong = 0;
+		ucschar pop = hangul_ic_pop(hic);
+		ucschar jong = hangul_choseong_to_jongseong(pop);
+		hangul_ic_push(hic, jong);
+	    }
+
 	    if (!hangul_ic_push(hic, combined)) {
 		if (!hangul_ic_push(hic, ch)) {
 		    return false;

hangul/hangulkeyboard.h

@@ -1179,8 +1179,19 @@ static const ucschar hangul_keyboard_table_ahn[] = {
 
 static const HangulCombinationItem hangul_combination_table_default[] = {
   { 0x11001100, 0x1101 }, /* choseong  kiyeok + kiyeok  = ssangkiyeok   */
+  { 0x11001109, 0x11aa }, /* choseong  kiyeok + sios    = kiyeok-sios(jong) */
+  { 0x1102110c, 0x11ac }, /* choseong  nieun  + cieuc   = nieun-cieuc(jong) */
+  { 0x11021112, 0x11ad }, /* choseong  nieun  + hieuh   = nieun-hieuh(jong) */
   { 0x11031103, 0x1104 }, /* choseong  tikeut + tikeut  = ssangtikeut   */
+  { 0x11051100, 0x11b0 }, /* choseong  rieul  + kiyeok  = rieul-kiyeok(jong) */
+  { 0x11051106, 0x11b1 }, /* choseong  rieul  + mieum   = rieul-mieum(jong) */
+  { 0x11051107, 0x11b2 }, /* choseong  rieul  + pieup   = rieul-pieup(jong) */
+  { 0x11051109, 0x11b3 }, /* choseong  rieul  + sios    = rieul-sios(jong) */
+  { 0x11051110, 0x11b4 }, /* choseong  rieul  + thieuth = rieul-thieuth(jong) */
+  { 0x11051111, 0x11b5 }, /* choseong  rieul  + phieuph = rieul-phieuph(jong) */
+  { 0x11051112, 0x11b6 }, /* choseong  rieul  + hieuh   = rieul-hieuh(jong) */
   { 0x11071107, 0x1108 }, /* choseong  pieup  + pieup   = ssangpieup    */
+  { 0x11071109, 0x11b9 }, /* choseong  pieup  + sios    = pieup-sios(jong) */
   { 0x11091109, 0x110a }, /* choseong  sios   + sios    = ssangsios     */
   { 0x110c110c, 0x110d }, /* choseong  cieuc  + cieuc   = ssangcieuc    */
   { 0x11691161, 0x116a }, /* jungseong o      + a       = wa            */

test/test.c

@@ -72,6 +72,11 @@ START_TEST(test_hangul_ic_process_2)
     fail_unless(check_preedit("2", "akfr", L"맑"));
     fail_unless(check_commit("2", "akfrh", L"말"));
     fail_unless(check_preedit("2", "akfrh", L"고"));
+
+    /* ㄱㅅㅏ*/
+    fail_unless(check_preedit("2", "rt", L"ㄳ"));
+    fail_unless(check_commit("2", "rtk", L"ㄱ"));
+    fail_unless(check_preedit("2", "rtk", L"사"));
 }
 END_TEST