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Introduce t_isalnum() to replace t_isalpha() || t_isdigit() tests.

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ts_locale.c omitted support for "isalnum" tests, perhaps on the
grounds that there were initially no use-cases for that.  However,
both ltree and pg_trgm need such tests, and we do also have one
use-case now in the core backend.  The workaround of testing
isalpha and isdigit separately seems quite inefficient, especially
when dealing with multibyte characters; so let's fill in the
missing support.

Discussion: https://postgr.es/m/2548310.1664999615@sss.pgh.pa.us
This commit is contained in:
Tom Lane
2022-10-06 11:08:56 -04:00
parent 5757141cae
commit ca71131eeb
5 changed files with 20 additions and 3 deletions
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contrib/pg_trgm/trgm.h
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@ -52,7 +52,7 @@ typedef char trgm[3];
} while(0)
#ifdef KEEPONLYALNUM
#define ISWORDCHR(c) (t_isalpha(c) || t_isdigit(c))
#define ISWORDCHR(c) (t_isalnum(c))
#define ISPRINTABLECHAR(a) ( isascii( *(unsigned char*)(a) ) && (isalnum( *(unsigned char*)(a) ) || *(unsigned char*)(a)==' ') )
#else
#define ISWORDCHR(c) (!t_isspace(c))