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LibUnicode: Fix Hangul syllable composition for specific cases
This fixes `combine_hangul_code_points` which would try to combine a LVT syllable with a trailing consonant, resulting in a wrong character. Also added a test for this specific case.
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sideshowbarker
2024-07-17 06:11:17 +09:00
Author: https://github.com/matcool Commit: https://github.com/SerenityOS/serenity/commit/104b51b912 Pull-request: https://github.com/SerenityOS/serenity/pull/15498 Reviewed-by: https://github.com/trflynn89 ✅
@ -63,6 +63,7 @@ TEST_CASE(normalize_nfc)
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EXPECT_EQ(normalize("\u1103\u1161\u11B0"sv, NormalizationForm::NFC), "닭"sv);
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EXPECT_EQ(normalize("\u1100\uAC00\u11A8"sv, NormalizationForm::NFC), "\u1100\uAC01"sv);
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EXPECT_EQ(normalize("\u1103\u1161\u11B0\u11B0"sv, NormalizationForm::NFC), "닭\u11B0");
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}
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TEST_CASE(normalize_nfkd)
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@ -111,7 +111,8 @@ static u32 combine_hangul_code_points(u32 a, u32 b)
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auto const leading_vowel_index = leading_index * HANGUL_BLOCK_COUNT + vowel_index * HANGUL_TRAILING_COUNT;
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return HANGUL_SYLLABLE_BASE + leading_vowel_index;
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}
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if (is_hangul_code_point(a) && is_hangul_trailing(b)) {
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// LV characters are the first in each "T block", so use this check to avoid combining LVT with T.
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if (is_hangul_code_point(a) && (a - HANGUL_SYLLABLE_BASE) % HANGUL_TRAILING_COUNT == 0 && is_hangul_trailing(b)) {
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return a + b - HANGUL_TRAILING_BASE;
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}
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return 0;
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