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AK: Add a Utf16View::code_unit_offset_of(Utf16CodePointIterator) helper

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This helper can be used to used to retrieve the code unit offset of an
active Utf16CodePointIterator efficiently.
This commit is contained in:
Idan Horowitz 2022-01-31 18:13:32 +02:00
parent 2d50c08f34
commit 44e8c05c67
Notes: sideshowbarker 2024-07-18 02:47:59 +09:00 
Author: https://github.com/IdanHo
Commit: https://github.com/SerenityOS/serenity/commit/44e8c05c675
Pull-request: https://github.com/SerenityOS/serenity/pull/12229
Reviewed-by: https://github.com/trflynn89 ✅
2 changed files with 9 additions and 0 deletions
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8
AK/Utf16View.cpp
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@ -165,6 +165,14 @@ size_t Utf16View::code_unit_offset_of(size_t code_point_offset) const
return code_unit_offset; return code_unit_offset;
} }
size_t Utf16View::code_unit_offset_of(Utf16CodePointIterator const& it) const
{
VERIFY(it.m_ptr >= begin_ptr());
VERIFY(it.m_ptr <= end_ptr());
return it.m_ptr - begin_ptr();
}
Utf16View Utf16View::substring_view(size_t code_unit_offset, size_t code_unit_length) const Utf16View Utf16View::substring_view(size_t code_unit_offset, size_t code_unit_length) const
{ {
VERIFY(!Checked<size_t>::addition_would_overflow(code_unit_offset, code_unit_length)); VERIFY(!Checked<size_t>::addition_would_overflow(code_unit_offset, code_unit_length));

1
AK/Utf16View.h
View File

@ -93,6 +93,7 @@ public:
size_t code_point_offset_of(size_t code_unit_offset) 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; size_t code_unit_offset_of(size_t code_point_offset) const;
size_t code_unit_offset_of(Utf16CodePointIterator const&) const;
Utf16View substring_view(size_t code_unit_offset, size_t code_unit_length) const; Utf16View substring_view(size_t code_unit_offset, size_t code_unit_length) const;
Utf16View substring_view(size_t code_unit_offset) const { return substring_view(code_unit_offset, length_in_code_units() - code_unit_offset); } Utf16View substring_view(size_t code_unit_offset) const { return substring_view(code_unit_offset, length_in_code_units() - code_unit_offset); }