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AK+LibUnicode: Provide Unicode-aware caseless String matching

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The Unicode spec defines much more complicated caseless matching
algorithms in its Collation spec. This implements the "basic" case
folding comparison.
This commit is contained in:
Timothy Flynn 2023-01-17 11:30:10 -05:00 • committed by Linus Groh
parent 8f2589b3b0
commit 537fcaf59e
3 changed files with 79 additions and 0 deletions
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60
Tests/AK/TestString.cpp
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@ -187,6 +187,66 @@ TEST_CASE(to_titlecase)
}
}
TEST_CASE(equals_ignoring_case)
{
{
String string1 {};
String string2 {};
EXPECT(MUST(string1.equals_ignoring_case(string2)));
}
{
auto string1 = MUST(String::from_utf8("abcd"sv));
auto string2 = MUST(String::from_utf8("ABCD"sv));
auto string3 = MUST(String::from_utf8("AbCd"sv));
auto string4 = MUST(String::from_utf8("dcba"sv));
EXPECT(MUST(string1.equals_ignoring_case(string2)));
EXPECT(MUST(string1.equals_ignoring_case(string3)));
EXPECT(!MUST(string1.equals_ignoring_case(string4)));
EXPECT(MUST(string2.equals_ignoring_case(string1)));
EXPECT(MUST(string2.equals_ignoring_case(string3)));
EXPECT(!MUST(string2.equals_ignoring_case(string4)));
EXPECT(MUST(string3.equals_ignoring_case(string1)));
EXPECT(MUST(string3.equals_ignoring_case(string2)));
EXPECT(!MUST(string3.equals_ignoring_case(string4)));
}
{
auto string1 = MUST(String::from_utf8("\u00DF"sv)); // LATIN SMALL LETTER SHARP S
auto string2 = MUST(String::from_utf8("SS"sv));
auto string3 = MUST(String::from_utf8("Ss"sv));
auto string4 = MUST(String::from_utf8("ss"sv));
auto string5 = MUST(String::from_utf8("S"sv));
auto string6 = MUST(String::from_utf8("s"sv));
EXPECT(MUST(string1.equals_ignoring_case(string2)));
EXPECT(MUST(string1.equals_ignoring_case(string3)));
EXPECT(MUST(string1.equals_ignoring_case(string4)));
EXPECT(!MUST(string1.equals_ignoring_case(string5)));
EXPECT(!MUST(string1.equals_ignoring_case(string6)));
EXPECT(MUST(string2.equals_ignoring_case(string1)));
EXPECT(MUST(string2.equals_ignoring_case(string3)));
EXPECT(MUST(string2.equals_ignoring_case(string4)));
EXPECT(!MUST(string2.equals_ignoring_case(string5)));
EXPECT(!MUST(string2.equals_ignoring_case(string6)));
EXPECT(MUST(string3.equals_ignoring_case(string1)));
EXPECT(MUST(string3.equals_ignoring_case(string2)));
EXPECT(MUST(string3.equals_ignoring_case(string4)));
EXPECT(!MUST(string3.equals_ignoring_case(string5)));
EXPECT(!MUST(string3.equals_ignoring_case(string6)));
EXPECT(MUST(string4.equals_ignoring_case(string1)));
EXPECT(MUST(string4.equals_ignoring_case(string2)));
EXPECT(MUST(string4.equals_ignoring_case(string3)));
EXPECT(!MUST(string4.equals_ignoring_case(string5)));
EXPECT(!MUST(string4.equals_ignoring_case(string6)));
}
}
TEST_CASE(is_one_of)
{
auto foo = MUST(String::from_utf8("foo"sv));