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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
3 changed files with 47 additions and 0 deletions
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19
AK/Utf16View.cpp
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@ -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;