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Add pg_iswcased().

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True if character has multiple case forms. Will be a useful
multibyte-aware replacement for char_is_cased().

Reviewed-by: Chao Li <li.evan.chao@gmail.com>
Reviewed-by: Peter Eisentraut <peter@eisentraut.org>
Discussion: https://postgr.es/m/450ceb6260cad30d7afdf155d991a9caafee7c0d.camel@j-davis.com
This commit is contained in:
Jeff Davis
2025-12-10 11:56:11 -08:00
parent 1e493158d3
commit 630706ced0
5 changed files with 44 additions and 0 deletions
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11
src/backend/utils/adt/pg_locale.c
View File

@@ -1588,6 +1588,17 @@ pg_iswxdigit(pg_wchar wc, pg_locale_t locale)
return locale->ctype->wc_isxdigit(wc, locale);
}
bool
pg_iswcased(pg_wchar wc, pg_locale_t locale)
{
/* for the C locale, Cased and Alpha are equivalent */
if (locale->ctype == NULL)
return (wc <= (pg_wchar) 127 &&
(pg_char_properties[wc] & PG_ISALPHA));
else
return locale->ctype->wc_iscased(wc, locale);
}
pg_wchar
pg_towupper(pg_wchar wc, pg_locale_t locale)
{

7
src/backend/utils/adt/pg_locale_builtin.c
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@@ -185,6 +185,12 @@ wc_isxdigit_builtin(pg_wchar wc, pg_locale_t locale)
return pg_u_isxdigit(to_char32(wc), !locale->builtin.casemap_full);
}
static bool
wc_iscased_builtin(pg_wchar wc, pg_locale_t locale)
{
return pg_u_prop_cased(to_char32(wc));
}
static bool
char_is_cased_builtin(char ch, pg_locale_t locale)
{
@@ -220,6 +226,7 @@ static const struct ctype_methods ctype_methods_builtin = {
.wc_isspace = wc_isspace_builtin,
.wc_isxdigit = wc_isxdigit_builtin,
.char_is_cased = char_is_cased_builtin,
.wc_iscased = wc_iscased_builtin,
.wc_tolower = wc_tolower_builtin,
.wc_toupper = wc_toupper_builtin,
};

7
src/backend/utils/adt/pg_locale_icu.c
View File

@@ -223,6 +223,12 @@ wc_isxdigit_icu(pg_wchar wc, pg_locale_t locale)
return u_isxdigit(wc);
}
static bool
wc_iscased_icu(pg_wchar wc, pg_locale_t locale)
{
return u_hasBinaryProperty(wc, UCHAR_CASED);
}
static const struct ctype_methods ctype_methods_icu = {
.strlower = strlower_icu,
.strtitle = strtitle_icu,
@@ -239,6 +245,7 @@ static const struct ctype_methods ctype_methods_icu = {
.wc_isspace = wc_isspace_icu,
.wc_isxdigit = wc_isxdigit_icu,
.char_is_cased = char_is_cased_icu,
.wc_iscased = wc_iscased_icu,
.wc_toupper = toupper_icu,
.wc_tolower = tolower_icu,
};

17
src/backend/utils/adt/pg_locale_libc.c
View File

@@ -184,6 +184,13 @@ wc_isxdigit_libc_sb(pg_wchar wc, pg_locale_t locale)
#endif
}
static bool
wc_iscased_libc_sb(pg_wchar wc, pg_locale_t locale)
{
return isupper_l((unsigned char) wc, locale->lt) ||
islower_l((unsigned char) wc, locale->lt);
}
static bool
wc_isdigit_libc_mb(pg_wchar wc, pg_locale_t locale)
{
@@ -248,6 +255,13 @@ wc_isxdigit_libc_mb(pg_wchar wc, pg_locale_t locale)
#endif
}
static bool
wc_iscased_libc_mb(pg_wchar wc, pg_locale_t locale)
{
return iswupper_l((wint_t) wc, locale->lt) ||
iswlower_l((wint_t) wc, locale->lt);
}
static bool
char_is_cased_libc(char ch, pg_locale_t locale)
{
@@ -332,6 +346,7 @@ static const struct ctype_methods ctype_methods_libc_sb = {
.wc_isspace = wc_isspace_libc_sb,
.wc_isxdigit = wc_isxdigit_libc_sb,
.char_is_cased = char_is_cased_libc,
.wc_iscased = wc_iscased_libc_sb,
.wc_toupper = toupper_libc_sb,
.wc_tolower = tolower_libc_sb,
};
@@ -357,6 +372,7 @@ static const struct ctype_methods ctype_methods_libc_other_mb = {
.wc_isspace = wc_isspace_libc_sb,
.wc_isxdigit = wc_isxdigit_libc_sb,
.char_is_cased = char_is_cased_libc,
.wc_iscased = wc_iscased_libc_sb,
.wc_toupper = toupper_libc_sb,
.wc_tolower = tolower_libc_sb,
};
@@ -378,6 +394,7 @@ static const struct ctype_methods ctype_methods_libc_utf8 = {
.wc_isspace = wc_isspace_libc_mb,
.wc_isxdigit = wc_isxdigit_libc_mb,
.char_is_cased = char_is_cased_libc,
.wc_iscased = wc_iscased_libc_mb,
.wc_toupper = toupper_libc_mb,
.wc_tolower = tolower_libc_mb,
};

2
src/include/utils/pg_locale.h
View File

@@ -122,6 +122,7 @@ struct ctype_methods
bool (*wc_ispunct) (pg_wchar wc, pg_locale_t locale);
bool (*wc_isspace) (pg_wchar wc, pg_locale_t locale);
bool (*wc_isxdigit) (pg_wchar wc, pg_locale_t locale);
bool (*wc_iscased) (pg_wchar wc, pg_locale_t locale);
pg_wchar (*wc_toupper) (pg_wchar wc, pg_locale_t locale);
pg_wchar (*wc_tolower) (pg_wchar wc, pg_locale_t locale);
@@ -214,6 +215,7 @@ extern bool pg_iswprint(pg_wchar wc, pg_locale_t locale);
extern bool pg_iswpunct(pg_wchar wc, pg_locale_t locale);
extern bool pg_iswspace(pg_wchar wc, pg_locale_t locale);
extern bool pg_iswxdigit(pg_wchar wc, pg_locale_t locale);
extern bool pg_iswcased(pg_wchar wc, pg_locale_t locale);
extern pg_wchar pg_towupper(pg_wchar wc, pg_locale_t locale);
extern pg_wchar pg_towlower(pg_wchar wc, pg_locale_t locale);