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AK: Add a Utf16View::starts_with method

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Based heavily on Utf8View::starts_with.
This commit is contained in:
Timothy Flynn 2024-01-03 13:17:57 -05:00 committed by Andreas Kling
parent c46ba7e68d
commit 1b4a23095c
Notes: sideshowbarker 2024-07-17 09:56:35 +09:00 
Author: https://github.com/trflynn89
Commit: https://github.com/SerenityOS/serenity/commit/1b4a23095c
Pull-request: https://github.com/SerenityOS/serenity/pull/22557
3 changed files with 47 additions and 0 deletions
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19
AK/Utf16View.cpp
View File

@ -213,6 +213,25 @@ Utf16View Utf16View::unicode_substring_view(size_t code_point_offset, size_t cod
VERIFY_NOT_REACHED();
}
bool Utf16View::starts_with(Utf16View const& needle) const
{
if (needle.is_empty())
return true;
if (is_empty())
return false;
if (needle.length_in_code_units() > length_in_code_units())
return false;
if (begin_ptr() == needle.begin_ptr())
return true;
for (auto this_it = begin(), needle_it = needle.begin(); needle_it != needle.end(); ++needle_it, ++this_it) {
if (*this_it != *needle_it)
return false;
}
return true;
}
bool Utf16View::validate(size_t& valid_code_units) const
{
valid_code_units = 0;

2
AK/Utf16View.h
View File

@ -111,6 +111,8 @@ public:
Utf16View unicode_substring_view(size_t code_point_offset, size_t code_point_length) const;
Utf16View unicode_substring_view(size_t code_point_offset) const { return unicode_substring_view(code_point_offset, length_in_code_points() - code_point_offset); }
bool starts_with(Utf16View const&) const;
bool validate(size_t& valid_code_units) const;
bool validate() const
{

26
Tests/AK/TestUtf16.cpp
View File

@ -310,3 +310,29 @@ TEST_CASE(substring_view)
EXPECT_EQ(MUST(view.to_utf8(Utf16View::AllowInvalidCodeUnits::No)), "\ufffd"sv);
}
}
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"🙃"));
}