postgresql/contrib/tsearch2/dict_ex.c
Teodor Sigaev cb4ea994c6 Improve support of multibyte encoding:
- tsvector_(in|out)
- tsquery_(in|out)
- to_tsvector
- to_tsquery, plainto_tsquery
- 'simple' dictionary
2005-12-12 11:10:12 +00:00

67 lines
1.2 KiB
C

/*
* example of dictionary
* Teodor Sigaev <teodor@sigaev.ru>
*/
#include "postgres.h"
#include "dict.h"
#include "common.h"
#include "ts_locale.h"
typedef struct
{
StopList stoplist;
} DictExample;
PG_FUNCTION_INFO_V1(dex_init);
Datum dex_init(PG_FUNCTION_ARGS);
PG_FUNCTION_INFO_V1(dex_lexize);
Datum dex_lexize(PG_FUNCTION_ARGS);
Datum
dex_init(PG_FUNCTION_ARGS)
{
DictExample *d = (DictExample *) malloc(sizeof(DictExample));
if (!d)
ereport(ERROR,
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of memory")));
memset(d, 0, sizeof(DictExample));
d->stoplist.wordop = lowerstr;
if (!PG_ARGISNULL(0) && PG_GETARG_POINTER(0) != NULL)
{
text *in = PG_GETARG_TEXT_P(0);
readstoplist(in, &(d->stoplist));
sortstoplist(&(d->stoplist));
PG_FREE_IF_COPY(in, 0);
}
PG_RETURN_POINTER(d);
}
Datum
dex_lexize(PG_FUNCTION_ARGS)
{
DictExample *d = (DictExample *) PG_GETARG_POINTER(0);
char *in = (char *) PG_GETARG_POINTER(1);
char *txt = pnstrdup(in, PG_GETARG_INT32(2));
TSLexeme *res = palloc(sizeof(TSLexeme) * 2);
memset(res, 0, sizeof(TSLexeme) * 2);
if (*txt == '\0' || searchstoplist(&(d->stoplist), txt))
{
pfree(txt);
}
else
res[0].lexeme = txt;
PG_RETURN_POINTER(res);
}