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AK+LibJS: Extract some UTF-16 helpers for use in an outside class

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An upcoming Utf16String will need access to these helpers. Let's make
them publicly available.
This commit is contained in:
Timothy Flynn 2025-06-12 17:39:05 -04:00 • committed by Tim Flynn
commit 66006d3812
Notes: github-actions[bot] 2025-07-03 13:54:12 +00:00
10 changed files with 121 additions and 86 deletions
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8
Libraries/LibWeb/Encoding/TextEncoderStream.cpp
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@ -184,11 +184,11 @@ Optional<u32> TextEncoderStream::convert_code_unit_to_scalar_value(u32 item, Utf
// 3. If item is a trailing surrogate, then return a scalar value from surrogates given leadingSurrogate
// and item.
if (Utf16View::is_low_surrogate(item)) {
if (AK::UnicodeUtils::is_utf16_low_surrogate(item)) {
// https://encoding.spec.whatwg.org/#scalar-value-from-surrogates
// To obtain a scalar value from surrogates, given a leading surrogate leading and a trailing surrogate
// trailing, return 0x10000 + ((leading − 0xD800) << 10) + (trailing − 0xDC00).
return Utf16View::decode_surrogate_pair(leading_surrogate, item);
return AK::UnicodeUtils::decode_utf16_surrogate_pair(leading_surrogate, item);
}
// 4. Restore item to input.
@ -199,13 +199,13 @@ Optional<u32> TextEncoderStream::convert_code_unit_to_scalar_value(u32 item, Utf
}
// 2. If item is a leading surrogate, then set encoder’s leading surrogate to item and return continue.
if (Utf16View::is_high_surrogate(item)) {
if (AK::UnicodeUtils::is_utf16_high_surrogate(item)) {
m_leading_surrogate = item;
return OptionalNone {};
}
// 3. If item is a trailing surrogate, then return U+FFFD.
if (Utf16View::is_low_surrogate(item))
if (AK::UnicodeUtils::is_utf16_low_surrogate(item))
return 0xFFFD;
// 4. Return item.