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AK: Add a method to find the byte offset of a code point

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This commit is contained in:
Timothy Flynn 2023-01-22 09:24:12 -05:00 • committed by Tim Flynn
parent 5e44b93af2
commit d50724956e
3 changed files with 58 additions and 0 deletions
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42
Tests/AK/TestString.cpp
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@ -315,3 +315,45 @@ TEST_CASE(split)
EXPECT_EQ(parts[2], "ω"sv);
}
}
TEST_CASE(find_byte_offset)
{
{
String string {};
auto index = string.find_byte_offset(0);
EXPECT(!index.has_value());
}
{
auto string = MUST(String::from_utf8("foo"sv));
auto index1 = string.find_byte_offset('f');
EXPECT_EQ(index1, 0u);
auto index2 = string.find_byte_offset('o');
EXPECT_EQ(index2, 1u);
auto index3 = string.find_byte_offset('o', *index2 + 1);
EXPECT_EQ(index3, 2u);
auto index4 = string.find_byte_offset('b');
EXPECT(!index4.has_value());
}
{
auto string = MUST(String::from_utf8("ωΣωΣω"sv));
auto index1 = string.find_byte_offset(0x03C9U);
EXPECT_EQ(index1, 0u);
auto index2 = string.find_byte_offset(0x03A3u);
EXPECT_EQ(index2, 2u);
auto index3 = string.find_byte_offset(0x03C9U, 2);
EXPECT_EQ(index3, 4u);
auto index4 = string.find_byte_offset(0x03A3u, 4);
EXPECT_EQ(index4, 6u);
auto index5 = string.find_byte_offset(0x03C9U, 6);
EXPECT_EQ(index5, 8u);
}
}