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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"
#ifdef EVAL_RUN
#ifdef PIVOT_STAT
ulong collstat=0;
#endif
#endif /* EVAL_RUN */
typedef struct st_ft_docstat {
FT_WORD *list;
uint uniq;
double sum;
#ifdef EVAL_RUN
uint words, totlen;
double max, nsum, nsum2;
#endif /* EVAL_RUN */
MI_INFO *info;
uint keynr;
byte *keybuf;
} FT_DOCSTAT;
static int FT_WORD_cmp(FT_WORD *w1, FT_WORD *w2)
{
return _mi_compare_text(default_charset_info,
(uchar*) w1->pos,w1->len,
(uchar*) w2->pos, w2->len,0);
}
static int walk_and_copy(FT_WORD *word,uint32 count,FT_DOCSTAT *docstat)
{
if(is_stopword(word->pos, word->len))
return 0;
word->weight=LWS_IN_USE;
#ifdef EVAL_RUN
word->cnt= (uchar) count;
if(docstat->max < word->weight) docstat->max=word->weight;
docstat->words+=count;
docstat->totlen+=word->len;
#endif /* EVAL_RUN */
docstat->sum+=word->weight;
memcpy_fixed((docstat->list)++,word,sizeof(FT_WORD));
return 0;
}
/* transforms tree of words into the array, applying normalization */
FT_WORD * ft_linearize(MI_INFO *info, uint keynr, byte *keybuf, TREE *wtree)
{
FT_WORD *wlist,*p;
FT_DOCSTAT docstat;
if ((wlist=(FT_WORD *) my_malloc(sizeof(FT_WORD)*
(1+wtree->elements_in_tree),MYF(0))))
{
docstat.info=info;
docstat.keynr=keynr;
docstat.keybuf=keybuf;
docstat.list=wlist;
docstat.uniq=wtree->elements_in_tree;
#ifdef EVAL_RUN
docstat.nsum=docstat.nsum2=docstat.max=docstat.words=docstat.totlen=
#endif /* EVAL_RUN */
docstat.sum=0;
tree_walk(wtree,(tree_walk_action)&walk_and_copy,&docstat,left_root_right);
}
delete_tree(wtree);
free(wtree);
if(wlist==NULL)
return NULL;
docstat.list->pos=NULL;
for(p=wlist;p->pos;p++)
{
p->weight=PRENORM_IN_USE;
#ifdef EVAL_RUN
docstat.nsum+=p->weight;
docstat.nsum2+=p->weight*p->weight;
#endif /* EVAL_RUN */
}
#ifdef EVAL_RUN
#ifdef PIVOT_STAT
collstat+=PIVOT_STAT;
#endif
#endif /* EVAL_RUN */
for(p=wlist;p->pos;p++)
{
p->weight/=NORM_IN_USE;
}
return wlist;
}
#ifdef HYPHEN_IS_DELIM
#define word_char(X) (isalnum(X) || (X)=='_' || (X)=='\'')
#else
#define word_char(X) (isalnum(X) || (X)=='_' || (X)=='\'' || (X)=='-')
#endif
/* this is rather dumb first version of the parser */
TREE * ft_parse(TREE *wtree, byte *doc, int doclen)
{
byte *end=doc+doclen;
FT_WORD w;
if(!wtree)
{
if(!(wtree=(TREE *)my_malloc(sizeof(TREE),MYF(0)))) return NULL;
init_tree(wtree,0,sizeof(FT_WORD),(qsort_cmp)&FT_WORD_cmp,0,NULL);
}
w.weight=0;
while(doc<end)
{
for(;doc<end;doc++)
if(word_char(*doc)) break;
for(w.pos=doc; doc<end; doc++)
if(!word_char(*doc)) break;
if((w.len=doc-w.pos) < MIN_WORD_LEN) continue;
if(!tree_insert(wtree, &w, 0))
{
delete_tree(wtree);
free(wtree);
return NULL;
}
}
return wtree;
}
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