/* 
 * example of dictionary 
 * Teodor Sigaev <teodor@sigaev.ru>
 */
#include <errno.h>
#include <stdlib.h>
#include <string.h>

#include "postgres.h"

#include "dict.h"
#include "common.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 )
		elog(ERROR, "No 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));
	char	**res=palloc(sizeof(char*)*2);

	if ( *txt=='\0' || searchstoplist(&(d->stoplist),txt) ) {
		pfree(txt);
		res[0]=NULL;
	} else 
		res[0]=txt;
	res[1]=NULL;

	PG_RETURN_POINTER(res);
}