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AK+Everywhere: Prepare Utf16View for integration with a UTF-16 string

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To prepare for an upcoming Utf16String, this migrates Utf16View to store
its data as a char16_t. Most function definitions are moved inline and
made constexpr.

This also adds a UDL to construct a Utf16View from a string literal:

    auto string = u"hello"sv;

This let's us remove the NTTP Utf16View constructor, as we have found
that such constructors bloat binary size quite a bit.
This commit is contained in:
Timothy Flynn 2025-06-26 12:52:23 -04:00 • committed by Tim Flynn
commit 86b1c78c1a
Notes: github-actions[bot] 2025-07-03 13:53:23 +00:00
17 changed files with 406 additions and 421 deletions
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2
AK/UnicodeUtils.h
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@ -158,7 +158,7 @@ constexpr ErrorOr<size_t> try_code_point_to_utf16(u32 code_point, Callback callb
* Compute the maximum number of UTF-8 bytes needed to store a given UTF-16 string, accounting for unmatched UTF-16 surrogates.
* This function will overcount by at most 33%; 2 bytes for every valid UTF-16 codepoint between U+100000 and U+10FFFF.
*/
[[nodiscard]] static inline size_t maximum_utf8_length_from_utf16(ReadonlySpan<u16> code_units)
[[nodiscard]] static inline size_t maximum_utf8_length_from_utf16(ReadonlySpan<char16_t> code_units)
{
// # UTF-8 code point -> no. UTF-8 bytes needed
// U+0000 - U+007F => 1 UTF-8 bytes