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grader-tc.c
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grader-tc.c
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/*
* grader-tc.c
*
* Copyright (C) 2003 Nadav Rotem <nadav256@hotmail.com>
*
* 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 Library 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.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "libots.h"
#include "grader-tc.h"
/*Grader - Term count algorithm*/
/*This is non-normelized term frequency algorithm without using inverse document frequency database */
#define NUM_KEY_WORDS 100 /* use first n key words only */
int
ots_get_article_word_count (const OtsArticle * Doc)
{
GList *li;
int articleWC;
articleWC = 0;
if (Doc==NULL) return 0;
for (li = (GList *) Doc->lines; li != NULL; li = li->next)
{
articleWC += ((OtsSentence *) li->data)->wc;
}
return articleWC;
}
/*take this line and add each word to the "wordStat" list
* this list will hold all of the words in the article and the number
* of times they appeared in the article.
*/
static void
ots_line_add_wordlist(OtsArticle * Doc,const OtsSentence * aLine)
{
GList *li;
if ((aLine==NULL) ||(NULL==Doc)) { return;}
for (li = (GList *) aLine->words; li != NULL; li = li->next) /* for each word in the sentence Do: */
if (li->data && strlen (li->data)) ots_add_wordstat (Doc, (char *)li->data);
return;
}
static void
ots_create_wordlist(OtsArticle * Doc)
{
GList *line;
if (Doc==NULL) return;
for (line = (GList *) Doc->lines; line != NULL; line = line->next)
{
OtsSentence * aLine=line->data;
if (aLine)
ots_line_add_wordlist(Doc,aLine);
}
}
static int
keyVal (const int n) /* Ugly , I know */
{
if (n == 1) return 3;
if (n == 2) return 2;
if (n == 3) return 2;
if (n == 4) return 2;
return 1;
}
static void
ots_grade_line (GList *impList, OtsSentence * aLine,
OtsStemRule * rule)
{
GList *li;
GList *di;
int n;
char *tmp_stem;
if ((aLine==NULL)||(rule==NULL)||(impList==NULL)) return;
for (li = (GList *) aLine->words; li != NULL; li = li->next) /* for each word */
{
n = 0;
tmp_stem = ots_stem_strip ((unsigned char *) li->data, rule);
for (di = (GList *) impList;
((di != NULL) && (n < NUM_KEY_WORDS)); di = di->next)
{
n++;
if ((NULL!=((OtsWordEntery *) di->data)->stem) && (NULL!=tmp_stem))
if (0 == strcmp ((((OtsWordEntery *) di->data)->stem), tmp_stem))
{
/* debug:
if (0!=strcmp((((OtsWordEntery *) di->data)->word),li->data))
printf("[%s][%s] stem[%s]\n",(((OtsWordEntery *) di->data)->word),li->data,tmp);*/
aLine->score += (((OtsWordEntery *) di->data)->occ) * keyVal (n);
}
}
g_free (tmp_stem);
}
}
void
ots_create_title_tc(OtsArticle * Doc)
{
char *tmp;
char *word;
int i;
GString *title;
if (NULL==Doc) return;
title=g_string_new(NULL);
for (i=0;i<5;i++)
{
word = ots_word_in_list(Doc->ImpWords,i);
if (word) g_string_append(title,word); else break;
if (i<4) g_string_append(title,",");
}
tmp=title->str;
if (NULL!=title) g_string_free(title,FALSE);
Doc->title=tmp;
}
void
ots_grade_doc_tc (OtsArticle * Doc)
{
GList *li;
if (NULL==Doc) return;
ots_create_wordlist(Doc);
Doc->ImpWords=ots_union_list (Doc->wordStat, Doc->dict); /* subtract from the Article wordlist all the words in the dic file (on , the , is...) */
Doc->ImpWords=ots_sort_list (Doc->ImpWords); /* sort the list , top 3 is what the article talks about (SARS , virus , cure ... ) */
/*to print wordlist: ots_print_wordlist (stdout, Doc->ImpWords);*/
if (0 == Doc->lineCount) return;
for (li = (GList *) Doc->lines; li != NULL; li = li->next)
{
if (li->data)
ots_grade_line (Doc->ImpWords, (OtsSentence *) li->data, Doc->stem);
}
ots_create_title_tc(Doc);
}