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ladybird/Tests/AK/TestUtf16.cpp

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/*
* Copyright (c) 2021-2024, Tim Flynn <trflynn89@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <LibTest/TestCase.h>
#include <AK/Array.h>
#include <AK/String.h>
#include <AK/StringView.h>
#include <AK/Types.h>
#include <AK/Utf16View.h>
TEST_CASE(decode_ascii)
{
auto string = MUST(AK::utf8_to_utf16("Hello World!11"sv));
Utf16View view { string };
size_t valid_code_units = 0;
EXPECT(view.validate(valid_code_units));
EXPECT_EQ(valid_code_units, view.length_in_code_units());
auto expected = Array { (u32)72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33, 49, 49 };
EXPECT_EQ(expected.size(), view.length_in_code_points());
size_t i = 0;
for (u32 code_point : view) {
EXPECT_EQ(code_point, expected[i++]);
}
EXPECT_EQ(i, expected.size());
}
TEST_CASE(decode_utf8)
{
auto string = MUST(AK::utf8_to_utf16("Привет, мир! 😀 γειά σου κόσμος こんにちは世界"sv));
Utf16View view { string };
size_t valid_code_units = 0;
EXPECT(view.validate(valid_code_units));
EXPECT_EQ(valid_code_units, view.length_in_code_units());
auto expected = Array { (u32)1055, 1088, 1080, 1074, 1077, 1090, 44, 32, 1084, 1080, 1088, 33, 32, 128512, 32, 947, 949, 953, 940, 32, 963, 959, 965, 32, 954, 972, 963, 956, 959, 962, 32, 12371, 12435, 12395, 12385, 12399, 19990, 30028 };
EXPECT_EQ(expected.size(), view.length_in_code_points());
size_t i = 0;
for (u32 code_point : view) {
EXPECT_EQ(code_point, expected[i++]);
}
EXPECT_EQ(i, expected.size());
}
TEST_CASE(encode_utf8)
{
{
auto utf8_string = "Привет, мир! 😀 γειά σου κόσμος こんにちは世界"_string;
auto string = MUST(AK::utf8_to_utf16(utf8_string));
Utf16View view { string };
EXPECT_EQ(MUST(view.to_utf8(Utf16View::AllowInvalidCodeUnits::Yes)), utf8_string);
EXPECT_EQ(MUST(view.to_utf8(Utf16View::AllowInvalidCodeUnits::No)), utf8_string);
}
{
auto encoded = Array { (u16)0xd83d };
Utf16View view { encoded };
EXPECT_EQ(MUST(view.to_utf8(Utf16View::AllowInvalidCodeUnits::Yes)), "\xed\xa0\xbd"sv);
EXPECT(view.to_utf8(Utf16View::AllowInvalidCodeUnits::No).is_error());
}
}
TEST_CASE(decode_utf16)
{
// Same string as the decode_utf8 test.
auto encoded = Array { (u16)0x041f, 0x0440, 0x0438, 0x0432, 0x0435, 0x0442, 0x002c, 0x0020, 0x043c, 0x0438, 0x0440, 0x0021, 0x0020, 0xd83d, 0xde00, 0x0020, 0x03b3, 0x03b5, 0x03b9, 0x03ac, 0x0020, 0x03c3, 0x03bf, 0x03c5, 0x0020, 0x03ba, 0x03cc, 0x03c3, 0x03bc, 0x03bf, 0x03c2, 0x0020, 0x3053, 0x3093, 0x306b, 0x3061, 0x306f, 0x4e16, 0x754c };
Utf16View view { encoded };
EXPECT_EQ(encoded.size(), view.length_in_code_units());
size_t valid_code_units = 0;
EXPECT(view.validate(valid_code_units));
EXPECT_EQ(valid_code_units, view.length_in_code_units());
auto expected = Array { (u32)1055, 1088, 1080, 1074, 1077, 1090, 44, 32, 1084, 1080, 1088, 33, 32, 128512, 32, 947, 949, 953, 940, 32, 963, 959, 965, 32, 954, 972, 963, 956, 959, 962, 32, 12371, 12435, 12395, 12385, 12399, 19990, 30028 };
EXPECT_EQ(expected.size(), view.length_in_code_points());
size_t i = 0;
for (u32 code_point : view) {
EXPECT_EQ(code_point, expected[i++]);
}
EXPECT_EQ(i, expected.size());
}
TEST_CASE(utf16_code_unit_length_from_utf8)
{
EXPECT_EQ(AK::utf16_code_unit_length_from_utf8(""sv), 0uz);
EXPECT_EQ(AK::utf16_code_unit_length_from_utf8("abc"sv), 3uz);
EXPECT_EQ(AK::utf16_code_unit_length_from_utf8("😀"sv), 2uz);
EXPECT_EQ(AK::utf16_code_unit_length_from_utf8("Привет, мир! 😀 γειά σου κόσμος こんにちは世界"sv), 39uz);
}
TEST_CASE(null_view)
{
Utf16View view;
EXPECT(view.validate());
EXPECT_EQ(view.length_in_code_units(), 0zu);
EXPECT_EQ(view.length_in_code_points(), 0zu);
EXPECT_EQ(MUST(view.to_utf8(Utf16View::AllowInvalidCodeUnits::No)), ""sv);
EXPECT_EQ(MUST(view.to_utf8(Utf16View::AllowInvalidCodeUnits::Yes)), ""sv);
for ([[maybe_unused]] auto it : view)
FAIL("Iterating a null UTF-16 string should not produce any values");
}
TEST_CASE(utf16_literal)
{
{
Utf16View view { u"" };
EXPECT(view.validate());
EXPECT_EQ(view.length_in_code_units(), 0u);
}
{
Utf16View view { u"a" };
EXPECT(view.validate());
EXPECT_EQ(view.length_in_code_units(), 1u);
EXPECT_EQ(view.code_unit_at(0), 0x61u);
}
{
Utf16View view { u"abc" };
EXPECT(view.validate());
EXPECT_EQ(view.length_in_code_units(), 3u);
EXPECT_EQ(view.code_unit_at(0), 0x61u);
EXPECT_EQ(view.code_unit_at(1), 0x62u);
EXPECT_EQ(view.code_unit_at(2), 0x63u);
}
{
Utf16View view { u"🙃" };
EXPECT(view.validate());
EXPECT_EQ(view.length_in_code_units(), 2u);
EXPECT_EQ(view.code_unit_at(0), 0xd83du);
EXPECT_EQ(view.code_unit_at(1), 0xde43u);
}
}
TEST_CASE(iterate_utf16)
{
auto string = MUST(AK::utf8_to_utf16("Привет 😀"sv));
Utf16View view { string };
auto iterator = view.begin();
EXPECT(*iterator == 1055);
EXPECT(iterator.length_in_code_units() == 1);
EXPECT(++iterator != view.end());
EXPECT(*iterator == 1088);
EXPECT(iterator.length_in_code_units() == 1);
EXPECT(++iterator != view.end());
EXPECT(*iterator == 1080);
EXPECT(iterator.length_in_code_units() == 1);
EXPECT(++iterator != view.end());
EXPECT(*iterator == 1074);
EXPECT(iterator.length_in_code_units() == 1);
EXPECT(++iterator != view.end());
EXPECT(*iterator == 1077);
EXPECT(iterator.length_in_code_units() == 1);
EXPECT(++iterator != view.end());
EXPECT(*iterator == 1090);
EXPECT(iterator.length_in_code_units() == 1);
EXPECT(++iterator != view.end());
EXPECT(*iterator == 32);
EXPECT(iterator.length_in_code_units() == 1);
EXPECT(++iterator != view.end());
EXPECT(*iterator == 128512);
EXPECT(iterator.length_in_code_units() == 2);
EXPECT(++iterator == view.end());
EXPECT_CRASH("Dereferencing Utf16CodePointIterator which is at its end.", [&iterator] {
*iterator;
return Test::Crash::Failure::DidNotCrash;
});
EXPECT_CRASH("Incrementing Utf16CodePointIterator which is at its end.", [&iterator] {
++iterator;
return Test::Crash::Failure::DidNotCrash;
});
}
TEST_CASE(validate_invalid_utf16)
{
size_t valid_code_units = 0;
{
// Lonely high surrogate.
auto invalid = Array { (u16)0xd800 };
EXPECT(!Utf16View(invalid).validate(valid_code_units));
EXPECT(valid_code_units == 0);
invalid = Array { (u16)0xdbff };
EXPECT(!Utf16View(invalid).validate(valid_code_units));
EXPECT(valid_code_units == 0);
}
{
// Lonely low surrogate.
auto invalid = Array { (u16)0xdc00 };
EXPECT(!Utf16View(invalid).validate(valid_code_units));
EXPECT(valid_code_units == 0);
invalid = Array { (u16)0xdfff };
EXPECT(!Utf16View(invalid).validate(valid_code_units));
EXPECT(valid_code_units == 0);
}
{
// High surrogate followed by non-surrogate.
auto invalid = Array { (u16)0xd800, 0 };
EXPECT(!Utf16View(invalid).validate(valid_code_units));
EXPECT(valid_code_units == 0);
invalid = Array { (u16)0xd800, 0xe000 };
EXPECT(!Utf16View(invalid).validate(valid_code_units));
EXPECT(valid_code_units == 0);
}
{
// High surrogate followed by high surrogate.
auto invalid = Array { (u16)0xd800, 0xd800 };
EXPECT(!Utf16View(invalid).validate(valid_code_units));
EXPECT(valid_code_units == 0);
invalid = Array { (u16)0xd800, 0xdbff };
EXPECT(!Utf16View(invalid).validate(valid_code_units));
EXPECT(valid_code_units == 0);
}
{
// Valid UTF-16 followed by invalid code units.
auto invalid = Array { (u16)0x41, 0x41, 0xd800 };
EXPECT(!Utf16View(invalid).validate(valid_code_units));
EXPECT(valid_code_units == 2);
invalid = Array { (u16)0x41, 0x41, 0xd800 };
EXPECT(!Utf16View(invalid).validate(valid_code_units));
EXPECT(valid_code_units == 2);
}
}
TEST_CASE(decode_invalid_utf16)
{
{
// Lonely high surrogate.
auto invalid = Array { (u16)0x41, 0x42, 0xd800 };
Utf16View view { invalid };
EXPECT_EQ(invalid.size(), view.length_in_code_units());
auto expected = Array { (u32)0x41, 0x42, 0xfffd };
EXPECT_EQ(expected.size(), view.length_in_code_points());
size_t i = 0;
for (u32 code_point : view) {
EXPECT_EQ(code_point, expected[i++]);
}
EXPECT_EQ(i, expected.size());
}
{
// Lonely low surrogate.
auto invalid = Array { (u16)0x41, 0x42, 0xdc00 };
Utf16View view { invalid };
EXPECT_EQ(invalid.size(), view.length_in_code_units());
auto expected = Array { (u32)0x41, 0x42, 0xfffd };
EXPECT_EQ(expected.size(), view.length_in_code_points());
size_t i = 0;
for (u32 code_point : view) {
EXPECT_EQ(code_point, expected[i++]);
}
EXPECT_EQ(i, expected.size());
}
{
// High surrogate followed by non-surrogate.
auto invalid = Array { (u16)0x41, 0x42, 0xd800, 0 };
Utf16View view { invalid };
EXPECT_EQ(invalid.size(), view.length_in_code_units());
auto expected = Array { (u32)0x41, 0x42, 0xfffd, 0 };
EXPECT_EQ(expected.size(), view.length_in_code_points());
size_t i = 0;
for (u32 code_point : view) {
EXPECT_EQ(code_point, expected[i++]);
}
EXPECT_EQ(i, expected.size());
}
{
// High surrogate followed by high surrogate.
auto invalid = Array { (u16)0x41, 0x42, 0xd800, 0xd800 };
Utf16View view { invalid };
EXPECT_EQ(invalid.size(), view.length_in_code_units());
auto expected = Array { (u32)0x41, 0x42, 0xfffd, 0xfffd };
EXPECT_EQ(expected.size(), view.length_in_code_points());
size_t i = 0;
for (u32 code_point : view) {
EXPECT_EQ(code_point, expected[i++]);
}
EXPECT_EQ(i, expected.size());
}
}
TEST_CASE(substring_view)
{
auto string = MUST(AK::utf8_to_utf16("Привет 😀"sv));
{
Utf16View view { string };
view = view.substring_view(7, 2);
EXPECT(view.length_in_code_units() == 2);
EXPECT_EQ(MUST(view.to_utf8()), "😀"sv);
}
{
Utf16View view { string };
view = view.substring_view(7, 1);
EXPECT(view.length_in_code_units() == 1);
EXPECT_EQ(MUST(view.to_utf8(Utf16View::AllowInvalidCodeUnits::Yes)), "\xed\xa0\xbd"sv);
EXPECT(view.to_utf8(Utf16View::AllowInvalidCodeUnits::No).is_error());
}
}
TEST_CASE(starts_with)
{
EXPECT(Utf16View {}.starts_with(u""));
EXPECT(!Utf16View {}.starts_with(u" "));
EXPECT(Utf16View { u"a" }.starts_with(u""));
EXPECT(Utf16View { u"a" }.starts_with(u"a"));
EXPECT(!Utf16View { u"a" }.starts_with(u"b"));
EXPECT(!Utf16View { u"a" }.starts_with(u"ab"));
EXPECT(Utf16View { u"abc" }.starts_with(u""));
EXPECT(Utf16View { u"abc" }.starts_with(u"a"));
EXPECT(Utf16View { u"abc" }.starts_with(u"ab"));
EXPECT(Utf16View { u"abc" }.starts_with(u"abc"));
EXPECT(!Utf16View { u"abc" }.starts_with(u"b"));
EXPECT(!Utf16View { u"abc" }.starts_with(u"bc"));
auto emoji = Utf16View { u"😀🙃" };
EXPECT(emoji.starts_with(u""));
EXPECT(emoji.starts_with(u"😀"));
EXPECT(emoji.starts_with(u"😀🙃"));
EXPECT(!emoji.starts_with(u"a"));
EXPECT(!emoji.starts_with(u"🙃"));
}
TEST_CASE(big_endian)
{
auto string = MUST(AK::utf8_to_utf16("säk😀"sv, AK::Endianness::Big));
Utf16View view { string, AK::Endianness::Big };
{
EXPECT(view.validate());
EXPECT_EQ(MUST(view.to_utf8()), "säk😀"sv);
EXPECT_EQ(view.length_in_code_units(), 5u);
EXPECT_EQ(view.length_in_code_points(), 4u);
EXPECT_EQ(view.code_unit_at(0), 0x73u);
EXPECT_EQ(view.code_unit_at(1), 0xe4u);
EXPECT_EQ(view.code_unit_at(2), 0x6bu);
EXPECT_EQ(view.code_unit_at(3), 0xd83d);
EXPECT_EQ(view.code_unit_at(4), 0xde00u);
EXPECT_EQ(view.code_point_at(0), 0x73u);
EXPECT_EQ(view.code_point_at(1), 0xe4u);
EXPECT_EQ(view.code_point_at(2), 0x6bu);
EXPECT_EQ(view.code_point_at(3), 0x1f600u);
EXPECT_EQ(view.code_point_at(4), 0xde00u);
}
{
Utf16Data data;
MUST(code_point_to_utf16(data, 's', AK::Endianness::Big));
MUST(code_point_to_utf16(data, 0xe4, AK::Endianness::Big));
MUST(code_point_to_utf16(data, 'k', AK::Endianness::Big));
MUST(code_point_to_utf16(data, 0x1f600, AK::Endianness::Big));
EXPECT_EQ(data, to_array<u16>({ 0x7300, 0xe400, 0x6b00, 0x3dd8, 0x00de }));
EXPECT_EQ(data, string);
}
}
TEST_CASE(little_endian)
{
auto string = MUST(AK::utf8_to_utf16("säk😀"sv, AK::Endianness::Little));
Utf16View view { string, AK::Endianness::Little };
{
EXPECT(view.validate());
EXPECT_EQ(MUST(view.to_utf8()), "säk😀"sv);
EXPECT_EQ(view.length_in_code_units(), 5u);
EXPECT_EQ(view.length_in_code_points(), 4u);
EXPECT_EQ(view.code_unit_at(0), 0x73u);
EXPECT_EQ(view.code_unit_at(1), 0xe4u);
EXPECT_EQ(view.code_unit_at(2), 0x6bu);
EXPECT_EQ(view.code_unit_at(3), 0xd83d);
EXPECT_EQ(view.code_unit_at(4), 0xde00u);
EXPECT_EQ(view.code_point_at(0), 0x73u);
EXPECT_EQ(view.code_point_at(1), 0xe4u);
EXPECT_EQ(view.code_point_at(2), 0x6bu);
EXPECT_EQ(view.code_point_at(3), 0x1f600u);
EXPECT_EQ(view.code_point_at(4), 0xde00u);
}
{
Utf16Data data;
MUST(code_point_to_utf16(data, 's', AK::Endianness::Little));
MUST(code_point_to_utf16(data, 0xe4, AK::Endianness::Little));
MUST(code_point_to_utf16(data, 'k', AK::Endianness::Little));
MUST(code_point_to_utf16(data, 0x1f600, AK::Endianness::Little));
EXPECT_EQ(data, to_array<u16>({ 0x73, 0xe4, 0x6b, 0xd83d, 0xde00 }));
EXPECT_EQ(data, string);
}
}
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