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LibUnicode: Detect ZWJ sequences when filtering by emoji presentation

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This was preventing some unqualified emoji sequences from rendering
properly, such as the custom SerenityOS flag. We rendered the flag
correctly when given the fully qualified sequence:

    U+1F3F3 U+FEOF U+200D U+1F41E

But were not detecting the unqualified sequence as an emoji when also
filtering for emoji-presentation sequences:

    U+1F3F3 U+200D U+1F41E
This commit is contained in:
Timothy Flynn 2023-03-04 12:19:45 -05:00 • committed by Andreas Kling
parent ab6bd946d8
commit f8a0365002
2 changed files with 22 additions and 1 deletions
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18
Tests/LibUnicode/TestEmoji.cpp
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@ -43,6 +43,24 @@ TEST_CASE(emoji)
test_emojis(s_flags);
}
TEST_CASE(emoji_presentation_only)
{
auto test_emoji = [](auto emoji, auto expected_result) {
Utf8View view { emoji };
auto is_start_of_emoji_sequence = Unicode::could_be_start_of_emoji_sequence(view.begin(), Unicode::SequenceType::EmojiPresentation);
EXPECT_EQ(is_start_of_emoji_sequence, expected_result);
};
test_emoji("©️"sv, true);
test_emoji("©"sv, false);
test_emoji("®️"sv, true);
test_emoji("®"sv, false);
test_emoji("\U0001F3F3\u200D\U0001F41E"sv, true); // SerenityOS flag
test_emoji("\U0001F3F3\uFE0F\u200D\U0001F41E"sv, true); // SerenityOS flag
}
TEST_CASE(ascii_is_not_emoji)
{
for (u32 code_point = 0u; is_ascii(code_point); ++code_point) {