2023年3月18日(土) 18:28 Jakub Jelinek <jakub@redhat.com>:

> That is a pretty simple thing, so no need to use an extra library for that.
> As is documented in contrib/unicode/README, the Unicode *.txt files are
> already checked in and there are several generators of tables.
> libcpp/makeucnid.cc already creates tables based on the
> UnicodeData.txt DerivedNormalizationProps.txt DerivedCoreProperties.txt
> files, including NFC/NKFC, it is true it doesn't currently compute
> whether a character is alphanumeric.  That is either Alphabetic
> DerivedCoreProperties.txt property, or for numeric Nd, Nl or No category
> (3rd column) in UnicodeData.txt.  Should be a few lines to add that support
> to libcpp/makeucnid.cc, the only question is if it won't make the ucnranges
> array much larger if it differentiates based on another ALPHANUM flag.
> If it doesn't grow too much, let's put it there, if it would grow too much,
> perhaps we should emit it in a separate table.
>

Sounds good. I have got a concrete idea of implementation.
Thank you everyone for giving your advice.

Sincerely yours,
Raiki Tamura