Add class to facilitate serialization and validation of code points #2858
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nvmkuruc
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Add class to facilitate serialization and validation of code points
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Filed as internal issue #USD-9069 |
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crevilla
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| TF_API std::ostream& operator<<(std::ostream&, const TfUtf8CodePoint); | ||
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| /// The replacement code point can be used to signal that a code point could | ||
| /// not be decoded and needed to be replaced. |
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It's not a big deal, but I think it would be a little cleaner if this was just
constexpr TfUtf8CodePoint TfUtf8InvalidCodePoint = TfUtf8CodePoint();
since the default constructed TfUtf8CodePoint is the invalid code point getting rid of another hardcoded 0xFFFD
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Description of Change(s)
Depends on (#2855)
#2788 was added to decode UTF-8 strings into code points. This change repurposes the encoding logic from #2120 into a wrapper around a
uint32_t. This wrapper validates on construction and only stores valid UTF-8 code points (ie. surrogates are excluded). Invalid code points are replaced (silently) with theReplacementValue. A stream operator for serialization is provided.The
TF_INVALID_CODE_POINTuint32_thas been replaced with aTfUtf8InvalidCodePointconstexprinstance.To aid testing,
EndAsIterator()has been added to theTfUtf8CodePointViewclass which returns an iterator of the same type asbegin(). While the language (via range based for loops) supports sentinelend()types as of C++17, many STL algorithms don't until C++20. WhileEndAsIterator()this creates redundant copies of thestring_view'send()value, in non-performance critical code, it may be preferable to enable usage of the STL.Fixes Issue(s)