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AK: Implement Utf8CodepointIterator::peek(size_t)

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This adds a peek method for Utf8CodepointIterator, which enables it to
be used in some parsing cases where peeking is necessary.

peek(0) is equivalent to operator*, expect that peek() does not contain
any assertions and will just return an empty Optional<u32>.

This also implements a test case for iterating UTF-8.
This commit is contained in:
Max Wipfli 2021-05-24 00:29:16 +02:00 • committed by Andreas Kling
commit 14506e8f5e
Notes: sideshowbarker 2024-07-18 17:04:53 +09:00
3 changed files with 55 additions and 0 deletions
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17
AK/Utf8View.cpp
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@ -240,4 +240,21 @@ u32 Utf8CodepointIterator::operator*() const
return code_point_value_so_far;
}
Optional<u32> Utf8CodepointIterator::peek(size_t offset) const
{
if (offset == 0) {
if (this->done())
return {};
return this->operator*();
}
auto new_iterator = *this;
for (size_t index = 0; index < offset; ++index) {
++new_iterator;
if (new_iterator.done())
return {};
}
return *new_iterator;
}
}