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Code Issues Projects Releases Packages Wiki Activity Actions 9

AK: Add a method to peek ahead of a UTF-16 iterator

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This commit is contained in:
Timothy Flynn 2025-07-28 10:42:05 -04:00 • committed by Jelle Raaijmakers
commit 67723ef83c
Notes: github-actions[bot] 2025-07-28 16:33:00 +00:00
2 changed files with 87 additions and 11 deletions
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79
Tests/AK/TestUtf16View.cpp
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@ -139,45 +139,102 @@ TEST_CASE(utf16_literal)
TEST_CASE(iterate_utf16)
{
auto string = Utf16String::from_utf8("Привет 😀"sv);
Utf16View view { string };
Utf16View view { u"Привет 😀🙃"sv };
auto iterator = view.begin();
EXPECT(*iterator == 1055);
EXPECT_EQ(*iterator, 0x041fu);
EXPECT(iterator.length_in_code_units() == 1);
EXPECT_EQ(iterator.peek(0), 0x041fu);
EXPECT_EQ(iterator.peek(1), 0x0440u);
EXPECT_EQ(iterator.peek(2), 0x0438u);
EXPECT_EQ(iterator.peek(3), 0x0432u);
EXPECT_EQ(iterator.peek(4), 0x0435u);
EXPECT_EQ(iterator.peek(5), 0x0442u);
EXPECT_EQ(iterator.peek(6), 0x0020u);
EXPECT_EQ(iterator.peek(7), 0x1f600u);
EXPECT_EQ(iterator.peek(8), 0x1f643u);
EXPECT(!iterator.peek(9).has_value());
EXPECT(++iterator != view.end());
EXPECT(*iterator == 1088);
EXPECT_EQ(*iterator, 0x0440u);
EXPECT(iterator.length_in_code_units() == 1);
EXPECT_EQ(iterator.peek(0), 0x0440u);
EXPECT_EQ(iterator.peek(1), 0x0438u);
EXPECT_EQ(iterator.peek(2), 0x0432u);
EXPECT_EQ(iterator.peek(3), 0x0435u);
EXPECT_EQ(iterator.peek(4), 0x0442u);
EXPECT_EQ(iterator.peek(5), 0x0020u);
EXPECT_EQ(iterator.peek(6), 0x1f600u);
EXPECT_EQ(iterator.peek(7), 0x1f643u);
EXPECT(!iterator.peek(8).has_value());
EXPECT(++iterator != view.end());
EXPECT(*iterator == 1080);
EXPECT_EQ(*iterator, 0x0438u);
EXPECT(iterator.length_in_code_units() == 1);
EXPECT_EQ(iterator.peek(0), 0x0438u);
EXPECT_EQ(iterator.peek(1), 0x0432u);
EXPECT_EQ(iterator.peek(2), 0x0435u);
EXPECT_EQ(iterator.peek(3), 0x0442u);
EXPECT_EQ(iterator.peek(4), 0x0020u);
EXPECT_EQ(iterator.peek(5), 0x1f600u);
EXPECT_EQ(iterator.peek(6), 0x1f643u);
EXPECT(!iterator.peek(7).has_value());
EXPECT(++iterator != view.end());
EXPECT(*iterator == 1074);
EXPECT_EQ(*iterator, 0x0432u);
EXPECT(iterator.length_in_code_units() == 1);
EXPECT_EQ(iterator.peek(0), 0x0432u);
EXPECT_EQ(iterator.peek(1), 0x0435u);
EXPECT_EQ(iterator.peek(2), 0x0442u);
EXPECT_EQ(iterator.peek(3), 0x0020u);
EXPECT_EQ(iterator.peek(4), 0x1f600u);
EXPECT_EQ(iterator.peek(5), 0x1f643u);
EXPECT(!iterator.peek(6).has_value());
EXPECT(++iterator != view.end());
EXPECT(*iterator == 1077);
EXPECT_EQ(*iterator, 0x0435u);
EXPECT(iterator.length_in_code_units() == 1);
EXPECT_EQ(iterator.peek(0), 0x0435u);
EXPECT_EQ(iterator.peek(1), 0x0442u);
EXPECT_EQ(iterator.peek(2), 0x0020u);
EXPECT_EQ(iterator.peek(3), 0x1f600u);
EXPECT_EQ(iterator.peek(4), 0x1f643u);
EXPECT(!iterator.peek(5).has_value());
EXPECT(++iterator != view.end());
EXPECT(*iterator == 1090);
EXPECT_EQ(*iterator, 0x0442u);
EXPECT(iterator.length_in_code_units() == 1);
EXPECT_EQ(iterator.peek(0), 0x0442u);
EXPECT_EQ(iterator.peek(1), 0x0020u);
EXPECT_EQ(iterator.peek(2), 0x1f600u);
EXPECT_EQ(iterator.peek(3), 0x1f643u);
EXPECT(!iterator.peek(4).has_value());
EXPECT(++iterator != view.end());
EXPECT(*iterator == 32);
EXPECT(*iterator == ' ');
EXPECT(iterator.length_in_code_units() == 1);
EXPECT_EQ(iterator.peek(0), 0x0020u);
EXPECT_EQ(iterator.peek(1), 0x1f600u);
EXPECT_EQ(iterator.peek(2), 0x1f643u);
EXPECT(!iterator.peek(3).has_value());
EXPECT(++iterator != view.end());
EXPECT(*iterator == 128512);
EXPECT_EQ(*iterator, 0x1f600u);
EXPECT(iterator.length_in_code_units() == 2);
EXPECT_EQ(iterator.peek(0), 0x1f600u);
EXPECT_EQ(iterator.peek(1), 0x1f643u);
EXPECT(!iterator.peek(2).has_value());
EXPECT(++iterator != view.end());
EXPECT_EQ(*iterator, 0x1f643u);
EXPECT(iterator.length_in_code_units() == 2);
EXPECT_EQ(iterator.peek(0), 0x1f643u);
EXPECT(!iterator.peek(1).has_value());
EXPECT(++iterator == view.end());
EXPECT(!iterator.peek(0).has_value());
EXPECT_DEATH("Dereferencing Utf16CodePointIterator which is at its end.", *iterator);
EXPECT_DEATH("Incrementing Utf16CodePointIterator which is at its end.", ++iterator);
}