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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;
67 lines
1.6 KiB
Plaintext
67 lines
1.6 KiB
Plaintext
/*
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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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#include "subinclude.h"
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HASINIT typedef struct {
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HASINIT StopList stoplist;
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HASINIT } DictExample;
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HASINIT PG_FUNCTION_INFO_V1(dinit_CFG_MODNAME);
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HASINIT Datum dinit_CFG_MODNAME(PG_FUNCTION_ARGS);
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HASINIT Datum
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HASINIT dinit_CFG_MODNAME(PG_FUNCTION_ARGS) {
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HASINIT DictExample *d = (DictExample*)malloc( sizeof(DictExample) );
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HASINIT
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HASINIT if ( !d )
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HASINIT ereport(ERROR,
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HASINIT (errcode(ERRCODE_OUT_OF_MEMORY),
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HASINIT errmsg("out of memory")));
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HASINIT memset(d,0,sizeof(DictExample));
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HASINIT
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HASINIT d->stoplist.wordop=lowerstr;
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HASINIT
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HASINIT /* Your INIT code */
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HASINIT
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HASINIT if ( !PG_ARGISNULL(0) && PG_GETARG_POINTER(0)!=NULL ) {
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HASINIT text *in = PG_GETARG_TEXT_P(0);
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HASINIT readstoplist(in, &(d->stoplist));
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HASINIT sortstoplist(&(d->stoplist));
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HASINIT PG_FREE_IF_COPY(in, 0);
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HASINIT }
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HASINIT
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HASINIT PG_RETURN_POINTER(d);
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HASINIT }
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PG_FUNCTION_INFO_V1(dlexize_CFG_MODNAME);
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Datum dlexize_CFG_MODNAME(PG_FUNCTION_ARGS);
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Datum
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dlexize_CFG_MODNAME(PG_FUNCTION_ARGS) {
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HASINIT 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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/* Your LEXIZE dictionary code */
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HASINIT if ( *txt=='\0' || searchstoplist(&(d->stoplist),txt) ) {
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HASINIT pfree(txt);
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HASINIT res[0].lexeme=NULL;
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HASINIT } else
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res[0].lexeme=txt;
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res[1].lexeme=NULL;
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PG_RETURN_POINTER(res);
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}
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