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AK+LibRegex: Add Utf16View::code_point_at and use it in RegexStringView

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The current method of iterating through the string to access a code
point hurts performance quite badly for very large strings. The test262
test "RegExp/property-escapes/generated/Any.js" previously took 3 hours
to complete; this one change brings it down to under 10 seconds.
This commit is contained in:
Timothy Flynn 2021-08-01 18:56:52 -04:00 • committed by Andreas Kling
parent bed51d856a
commit 510bbcd8e0
3 changed files with 21 additions and 0 deletions
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AK/Utf16View.h
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@ -87,6 +87,7 @@ public:
u16 const* data() const { return m_code_units.data(); }
u16 code_unit_at(size_t index) const;
u32 code_point_at(size_t index) const;
size_t code_point_offset_of(size_t code_unit_offset) const;
size_t code_unit_offset_of(size_t code_point_offset) const;