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/*-------------------------------------------------------------------------
*
* dict_simple.c
* Simple dictionary: just lowercase and check for stopword
*
* Portions Copyright (c) 1996-2007, PostgreSQL Global Development Group
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/tsearch/dict_simple.c,v 1.3 2007/08/25 00:03:59 tgl Exp $
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"
#include "commands/defrem.h"
#include "tsearch/ts_locale.h"
#include "tsearch/ts_public.h"
#include "tsearch/ts_utils.h"
#include "utils/builtins.h"
typedef struct
{
StopList stoplist;
} DictSimple;
Datum
dsimple_init(PG_FUNCTION_ARGS)
{
List *dictoptions = (List *) PG_GETARG_POINTER(0);
DictSimple *d = (DictSimple *) palloc0(sizeof(DictSimple));
bool stoploaded = false;
ListCell *l;
foreach(l, dictoptions)
{
DefElem *defel = (DefElem *) lfirst(l);
if (pg_strcasecmp("StopWords", defel->defname) == 0)
{
if (stoploaded)
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("multiple StopWords parameters")));
readstoplist(defGetString(defel), &d->stoplist, lowerstr);
stoploaded = true;
}
else
{
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("unrecognized simple dictionary parameter: \"%s\"",
defel->defname)));
}
}
PG_RETURN_POINTER(d);
}
Datum
dsimple_lexize(PG_FUNCTION_ARGS)
{
DictSimple *d = (DictSimple *) PG_GETARG_POINTER(0);
char *in = (char *) PG_GETARG_POINTER(1);
int32 len = PG_GETARG_INT32(2);
char *txt;
TSLexeme *res = palloc0(sizeof(TSLexeme) * 2);
txt = lowerstr_with_len(in, len);
if (*txt == '\0' || searchstoplist(&(d->stoplist), txt))
pfree(txt);
else
res[0].lexeme = txt;
PG_RETURN_POINTER(res);
}
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