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Support Unicode full case mapping and conversion.

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Generate tables from Unicode SpecialCasing.txt to support more
sophisticated case mapping behavior:

 * support case mappings to multiple codepoints, such as "ß"
   uppercasing to "SS"
 * support conditional case mappings, such as the "final sigma"
 * support titlecase variants, such as "dž" uppercasing to "DŽ" but
   titlecasing to "Dž"

Discussion: https://postgr.es/m/ddfd67928818f138f51635712529bc5e1d25e4e7.camel@j-davis.com
Discussion: https://postgr.es/m/27bb0e52-801d-4f73-a0a4-02cfdd4a9ada@eisentraut.org
Reviewed-by: Peter Eisentraut, Daniel Verite
This commit is contained in:
Jeff Davis
2025-01-17 15:56:20 -08:00
parent 6a9b2a631a
commit 286a365b9c
9 changed files with 3645 additions and 2993 deletions
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6
src/backend/utils/adt/pg_locale_builtin.c
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@@ -78,7 +78,7 @@ size_t
strlower_builtin(char *dest, size_t destsize, const char *src, ssize_t srclen,
pg_locale_t locale)
{
return unicode_strlower(dest, destsize, src, srclen);
return unicode_strlower(dest, destsize, src, srclen, false);
}
size_t
@@ -93,7 +93,7 @@ strtitle_builtin(char *dest, size_t destsize, const char *src, ssize_t srclen,
.prev_alnum = false,
};
return unicode_strtitle(dest, destsize, src, srclen,
return unicode_strtitle(dest, destsize, src, srclen, false,
initcap_wbnext, &wbstate);
}
@@ -101,7 +101,7 @@ size_t
strupper_builtin(char *dest, size_t destsize, const char *src, ssize_t srclen,
pg_locale_t locale)
{
return unicode_strupper(dest, destsize, src, srclen);
return unicode_strupper(dest, destsize, src, srclen, false);
}
pg_locale_t