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LibUnicode: Implement locale-aware BEFORE_DOT special casing

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Note that the algorithm in the Unicode spec is for checking that a code
point precedes U+0307, but the special casing condition NotBeforeDot is
interested in the inverse of this rule.
This commit is contained in:
Timothy Flynn 2021-09-05 15:09:03 -04:00 committed by Linus Groh
parent 436faf9fd9
commit 50158abaf1
Notes: sideshowbarker 2024-07-18 04:36:30 +09:00 
Author: https://github.com/trflynn89
Commit: https://github.com/SerenityOS/serenity/commit/50158abaf19
Pull-request: https://github.com/SerenityOS/serenity/pull/9841
Reviewed-by: https://github.com/IdanHo
Reviewed-by: https://github.com/linusg ✅
2 changed files with 50 additions and 1 deletions
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23
Tests/LibUnicode/TestUnicodeCharacterTypes.cpp
View File

@ -243,6 +243,29 @@ TEST_CASE(to_unicode_lowercase_special_casing_more_above)
EXPECT_EQ(result, "\u012f\u0307\u0300"sv);
}
TEST_CASE(to_unicode_lowercase_special_casing_not_before_dot)
{
// LATIN CAPITAL LETTER I
auto result = Unicode::to_unicode_lowercase_full("I"sv, "en"sv);
EXPECT_EQ(result, "i"sv);
result = Unicode::to_unicode_lowercase_full("I"sv, "az"sv);
EXPECT_EQ(result, "\u0131"sv);
result = Unicode::to_unicode_lowercase_full("I"sv, "tr"sv);
EXPECT_EQ(result, "\u0131"sv);
// LATIN CAPITAL LETTER I followed by COMBINING DOT ABOVE
result = Unicode::to_unicode_lowercase_full("I\u0307"sv, "en"sv);
EXPECT_EQ(result, "i\u0307"sv);
result = Unicode::to_unicode_lowercase_full("I\u0307"sv, "az"sv);
EXPECT_EQ(result, "i"sv);
result = Unicode::to_unicode_lowercase_full("I\u0307"sv, "tr"sv);
EXPECT_EQ(result, "i"sv);
}
TEST_CASE(to_unicode_uppercase_unconditional_special_casing)
{
// LATIN SMALL LETTER SHARP S

28
Userland/Libraries/LibUnicode/CharacterTypes.cpp
View File

@ -135,6 +135,30 @@ static bool is_followed_by_combining_class_above(Utf8View const& string, size_t
return false;
}
static bool is_followed_by_combining_dot_above(Utf8View const& string, size_t index, size_t byte_length)
{
// C is followed by combining dot above (U+0307). Any sequence of characters with a combining class that is neither 0 nor 230 may
// intervene between the current character and the combining dot above.
auto following_view = ((index + byte_length) < string.byte_length())
? string.substring_view(index + byte_length)
: Utf8View {};
for (auto code_point : following_view) {
if (code_point == 0x307)
return true;
auto unicode_data = Detail::unicode_data_for_code_point(code_point);
if (!unicode_data.has_value())
return false;
if (unicode_data->canonical_combining_class == 0)
return false;
if (unicode_data->canonical_combining_class == 230)
return false;
}
return false;
}
static SpecialCasing const* find_matching_special_case(Utf8View const& string, Optional<StringView> locale, size_t index, size_t byte_length, UnicodeData const& unicode_data)
{
auto requested_locale = Locale::None;
@ -174,7 +198,9 @@ static SpecialCasing const* find_matching_special_case(Utf8View const& string, O
return special_casing;
break;
default:
case Condition::NotBeforeDot:
if (!is_followed_by_combining_dot_above(string, index, byte_length))
return special_casing;
break;
}
}