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/* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult AB
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
/* Written by Sergei A. Golubchik, who has a shared copyright to this code */
#include "ftdefs.h"
/* search with boolean queries */
typedef struct st_all_in_one {
MI_INFO *info;
uint keynr;
uchar *keybuff;
MI_KEYDEF *keyinfo;
my_off_t key_root;
TREE dtree;
byte *start, *end;
uint total_yes, total_no;
} ALL_IN_ONE;
typedef struct st_ft_superdoc {
FT_DOC doc;
//FT_WORD *word_ptr;
//double tmp_weight;
uint yes;
uint no;
uint wno;
ALL_IN_ONE *aio;
} FT_SUPERDOC;
static int FT_SUPERDOC_cmp(void* cmp_arg __attribute__((unused)),
FT_SUPERDOC *p1, FT_SUPERDOC *p2)
{
if (p1->doc.dpos < p2->doc.dpos)
return -1;
if (p1->doc.dpos == p2->doc.dpos)
return 0;
return 1;
}
static int walk_and_copy(FT_SUPERDOC *from,
uint32 count __attribute__((unused)), FT_DOC **to)
{
if (from->yes == from->aio->total_yes && !from->no)
{
(*to)->dpos=from->doc.dpos;
(*to)->weight=from->doc.weight;
(*to)++;
}
return 0;
}
static double _wghts[11]={
0.131687242798354,
0.197530864197531,
0.296296296296296,
0.444444444444444,
0.666666666666667,
1.000000000000000,
1.500000000000000,
2.250000000000000,
3.375000000000000,
5.062500000000000,
7.593750000000000};
static double *wghts=_wghts+5; // wghts[i] = 1.5**i
static double _nwghts[11]={
-0.065843621399177,
-0.098765432098766,
-0.148148148148148,
-0.222222222222222,
-0.333333333333334,
-0.500000000000000,
-0.750000000000000,
-1.125000000000000,
-1.687500000000000,
-2.531250000000000,
-3.796875000000000};
static double *nwghts=_nwghts+5; // nwghts[i] = -0.5*1.5**i
int do_boolean(ALL_IN_ONE *aio, uint nested __attribute__((unused)),
int yesno __attribute__((unused)),
int plusminus, bool pmsign)
{
int r, res;
uint keylen, wno;
FT_SUPERDOC sdoc, *sptr;
TREE_ELEMENT *selem;
FT_WORD w;
FTB_PARAM param;
#ifdef EVAL_RUN
return 1;
#endif /* EVAL_RUN */
param.prev=' ';
for(wno=1; (res=ft_get_word(&aio->start,aio->end,&w,¶m)); wno++)
{
r=plusminus+param.plusminus;
if (param.pmsign^pmsign)
w.weight=nwghts[(r>5)?5:((r<-5)?-5:r)];
else
w.weight=wghts[(r>5)?5:((r<-5)?-5:r)];
if (param.yesno>0) aio->total_yes++;
if (param.yesno<0) aio->total_no++;
switch (res) {
case FTB_LBR: // (
//if (do_boolean(aio,nested+1,my_yesno,plusminus+my_plusminus))
// return 1;
// ???
break;
case 1: // word
keylen=_ft_make_key(aio->info,aio->keynr,(char*) aio->keybuff,&w,0);
keylen-=HA_FT_WLEN;
r=_mi_search(aio->info, aio->keyinfo, aio->keybuff, keylen,
SEARCH_FIND | SEARCH_PREFIX, aio->key_root);
while (!r)
{
if (param.trunc)
r=_mi_compare_text(default_charset_info,
aio->info->lastkey+1,keylen-1,
aio->keybuff+1,keylen-1,0);
else
r=_mi_compare_text(default_charset_info,
aio->info->lastkey,keylen,
aio->keybuff,keylen,0);
if (r) break;
sdoc.doc.dpos=aio->info->lastpos;
/* saving document matched into dtree */
if (!(selem=tree_insert(&aio->dtree, &sdoc, 0))) return 1;
sptr=(FT_SUPERDOC *)ELEMENT_KEY((&aio->dtree), selem);
if (selem->count==1) /* document's first match */
{
sptr->yes=0;
sptr->no=0;
sptr->doc.weight=0;
sptr->aio=aio;
sptr->wno=0;
}
if (sptr->wno != wno)
{
if (param.yesno>0) sptr->yes++;
if (param.yesno<0) sptr->no++;
sptr->wno=wno;
}
sptr->doc.weight+=w.weight;
if (_mi_test_if_changed(aio->info) == 0)
r=_mi_search_next(aio->info, aio->keyinfo, aio->info->lastkey,
aio->info->lastkey_length, SEARCH_BIGGER,
aio->key_root);
else
r=_mi_search(aio->info, aio->keyinfo, aio->info->lastkey,
USE_WHOLE_KEY, SEARCH_BIGGER,
aio->key_root);
}
break;
case FTB_RBR: // )
break;
}
}
return 0;
}
FT_DOCLIST *ft_boolean_search(MI_INFO *info, uint keynr, byte *query,
uint query_len)
{
ALL_IN_ONE aio;
FT_DOC *dptr;
FT_DOCLIST *dlist=NULL;
aio.info=info;
aio.keynr=keynr;
aio.keybuff=aio.info->lastkey+aio.info->s->base.max_key_length;
aio.keyinfo=aio.info->s->keyinfo+keynr;
aio.key_root=aio.info->s->state.key_root[keynr];
aio.start=query;
aio.end=query+query_len;
aio.total_yes=aio.total_no=0;
init_tree(&aio.dtree,0,0,sizeof(FT_SUPERDOC),(qsort_cmp2)&FT_SUPERDOC_cmp,0,
NULL, NULL);
if (do_boolean(&aio,0,0,0,0))
goto err;
dlist=(FT_DOCLIST *)my_malloc(sizeof(FT_DOCLIST)+sizeof(FT_DOC)*(aio.dtree.elements_in_tree-1),MYF(0));
if(!dlist)
goto err;
dlist->ndocs=aio.dtree.elements_in_tree;
dlist->curdoc=-1;
dlist->info=aio.info;
dptr=dlist->doc;
tree_walk(&aio.dtree, (tree_walk_action)&walk_and_copy, &dptr, left_root_right);
dlist->ndocs=dptr - dlist->doc;
err:
delete_tree(&aio.dtree);
return dlist;
}
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