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Teach regular expression operators to honor collations.

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This involves getting the character classification and case-folding
functions in the regex library to use the collations infrastructure.
Most of this work had been done already in connection with the upper/lower
and LIKE logic, so it was a simple matter of transposition.

While at it, split out these functions into a separate source file
regc_pg_locale.c, so that they can be correctly labeled with the Postgres
project's license rather than the Scriptics license.  These functions are
100% Postgres-written code whereas what remains in regc_locale.c is still
mostly not ours, so lumping them both under the same copyright notice was
getting more and more misleading.
This commit is contained in:
Tom Lane
2011-04-10 18:02:17 -04:00
parent 210f95f1cd
commit 1e16a8107d
12 changed files with 821 additions and 194 deletions
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12
src/backend/regex/regcomp.c
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@ -172,7 +172,7 @@ static void addrange(struct cvec *, chr, chr);
static struct cvec *getcvec(struct vars *, int, int);
static void freecvec(struct cvec *);
/* === regc_locale.c === */
/* === regc_pg_locale.c === */
static int pg_wc_isdigit(pg_wchar c);
static int pg_wc_isalpha(pg_wchar c);
static int pg_wc_isalnum(pg_wchar c);
@ -184,6 +184,8 @@ static int pg_wc_ispunct(pg_wchar c);
static int pg_wc_isspace(pg_wchar c);
static pg_wchar pg_wc_toupper(pg_wchar c);
static pg_wchar pg_wc_tolower(pg_wchar c);
/* === regc_locale.c === */
static celt element(struct vars *, const chr *, const chr *);
static struct cvec *range(struct vars *, celt, celt, int);
static int before(celt, celt);
@ -281,7 +283,8 @@ int
pg_regcomp(regex_t *re,
const chr *string,
size_t len,
int flags)
int flags,
Oid collation)
{
struct vars var;
struct vars *v = &var;
@ -307,6 +310,9 @@ pg_regcomp(regex_t *re,
if (!(flags & REG_EXTENDED) && (flags & REG_ADVF))
return REG_INVARG;
/* Initialize locale-dependent support */
pg_set_regex_collation(collation);
/* initial setup (after which freev() is callable) */
v->re = re;
v->now = string;
@ -333,6 +339,7 @@ pg_regcomp(regex_t *re,
re->re_magic = REMAGIC;
re->re_info = 0; /* bits get set during parse */
re->re_csize = sizeof(chr);
re->re_collation = collation;
re->re_guts = NULL;
re->re_fns = VS(&functions);
@ -1987,4 +1994,5 @@ stid(struct subre * t,
#include "regc_color.c"
#include "regc_nfa.c"
#include "regc_cvec.c"
#include "regc_pg_locale.c"
#include "regc_locale.c"