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324300bc7c
regression=# select to_tsquery( '\'fotballklubber\'');
to_tsquery
------------------------------------------------
'fotball' & 'klubb' | 'fot' & 'ball' & 'klubb'
(1 row)
So, changed interface to dictionaries, lexize method of dictionary shoud return
pointer to aray of TSLexeme structs instead of char**. Last element should
have TSLexeme->lexeme == NULL.
typedef struct {
/* number of variant of split word , for example
Word 'fotballklubber' (norwegian) has two varian to split:
( fotball, klubb ) and ( fot, ball, klubb ). So, dictionary
should return:
nvariant lexeme
1 fotball
1 klubb
2 fot
2 ball
2 klubb
*/
uint16 nvariant;
/* currently unused */
uint16 flags;
/* C-string */
char *lexeme;
} TSLexeme;
70 lines
1.2 KiB
C
70 lines
1.2 KiB
C
/*
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* example of dictionary
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* Teodor Sigaev <teodor@sigaev.ru>
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*/
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#include <errno.h>
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#include <stdlib.h>
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#include <string.h>
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#include "postgres.h"
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#include "dict.h"
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#include "common.h"
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typedef struct
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{
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StopList stoplist;
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} DictExample;
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PG_FUNCTION_INFO_V1(dex_init);
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Datum dex_init(PG_FUNCTION_ARGS);
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PG_FUNCTION_INFO_V1(dex_lexize);
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Datum dex_lexize(PG_FUNCTION_ARGS);
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Datum
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dex_init(PG_FUNCTION_ARGS)
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{
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DictExample *d = (DictExample *) malloc(sizeof(DictExample));
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if (!d)
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ereport(ERROR,
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(errcode(ERRCODE_OUT_OF_MEMORY),
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errmsg("out of memory")));
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memset(d, 0, sizeof(DictExample));
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d->stoplist.wordop = lowerstr;
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if (!PG_ARGISNULL(0) && PG_GETARG_POINTER(0) != NULL)
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{
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text *in = PG_GETARG_TEXT_P(0);
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readstoplist(in, &(d->stoplist));
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sortstoplist(&(d->stoplist));
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PG_FREE_IF_COPY(in, 0);
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}
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PG_RETURN_POINTER(d);
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}
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Datum
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dex_lexize(PG_FUNCTION_ARGS)
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{
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DictExample *d = (DictExample *) PG_GETARG_POINTER(0);
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char *in = (char *) PG_GETARG_POINTER(1);
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char *txt = pnstrdup(in, PG_GETARG_INT32(2));
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TSLexeme *res = palloc(sizeof(TSLexeme) * 2);
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memset(res,0,sizeof(TSLexeme) * 2);
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if (*txt == '\0' || searchstoplist(&(d->stoplist), txt))
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{
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pfree(txt);
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}
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else
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res[0].lexeme = txt;
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PG_RETURN_POINTER(res);
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}
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