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AK: Add spec comments to Utf16CodePointIterator::operator*()

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Nico Weber 2023-01-22 11:31:01 -05:00 committed by Linus Groh
parent 401246ae21
commit aa9037eed4
Notes: sideshowbarker 2024-07-17 02:37:08 +09:00 
Author: https://github.com/nico
Commit: https://github.com/SerenityOS/serenity/commit/aa9037eed4
Pull-request: https://github.com/SerenityOS/serenity/pull/17133
1 changed files with 14 additions and 0 deletions
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14
AK/Utf16View.cpp
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@ -276,6 +276,20 @@ u32 Utf16CodePointIterator::operator*() const
{
VERIFY(m_remaining_code_units > 0);
// rfc2781, 2.2 Decoding UTF-16
// 1) If W1 < 0xD800 or W1 > 0xDFFF, the character value U is the value
// of W1. Terminate.
// 2) Determine if W1 is between 0xD800 and 0xDBFF. If not, the sequence
// is in error and no valid character can be obtained using W1.
// Terminate.
// 3) If there is no W2 (that is, the sequence ends with W1), or if W2
// is not between 0xDC00 and 0xDFFF, the sequence is in error.
// Terminate.
// 4) Construct a 20-bit unsigned integer U', taking the 10 low-order
// bits of W1 as its 10 high-order bits and the 10 low-order bits of
// W2 as its 10 low-order bits.
// 5) Add 0x10000 to U' to obtain the character value U. Terminate.
if (Utf16View::is_high_surrogate(*m_ptr)) {
if ((m_remaining_code_units > 1) && Utf16View::is_low_surrogate(*(m_ptr + 1)))
return Utf16View::decode_surrogate_pair(*m_ptr, *(m_ptr + 1));