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AK: Add Utf8View::iterator_at_byte_offset method
This implements a method to get a Utf8CodepointIterator at a specified byte offset.
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sideshowbarker
2024-07-18 17:36:27 +09:00
Author: https://github.com/MaxWipfli Commit: https://github.com/SerenityOS/serenity/commit/a72bb34970e Pull-request: https://github.com/SerenityOS/serenity/pull/7268 Issue: https://github.com/SerenityOS/serenity/issues/7182 Issue: https://github.com/SerenityOS/serenity/issues/7202 Reviewed-by: https://github.com/Dexesttp
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@ -46,6 +46,17 @@ Utf8CodepointIterator Utf8View::end() const
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return { end_ptr(), 0 };
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}
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Utf8CodepointIterator Utf8View::iterator_at_byte_offset(size_t byte_offset) const
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{
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size_t current_offset = 0;
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for (auto iterator = begin(); !iterator.done(); ++iterator) {
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if (current_offset >= byte_offset)
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return iterator;
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current_offset += iterator.code_point_length_in_bytes();
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}
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return end();
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}
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size_t Utf8View::byte_offset_of(const Utf8CodepointIterator& it) const
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{
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VERIFY(it.m_ptr >= begin_ptr());
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@ -54,6 +54,7 @@ public:
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Utf8CodepointIterator begin() const;
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Utf8CodepointIterator end() const;
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Utf8CodepointIterator iterator_at_byte_offset(size_t) const;
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const unsigned char* bytes() const { return begin_ptr(); }
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size_t byte_length() const { return m_string.length(); }
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