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//
// Synonym.cc
//
// Synonym: A fuzzy matching algorithm to create a database of related words
// (or misspellings) that should be searched together.
//
// Part of the ht://Dig package <http://www.htdig.org/>
// Copyright (c) 1995-2004 The ht://Dig Group
// For copyright details, see the file COPYING in your distribution
// or the GNU Library General Public License (LGPL) version 2 or later
// <http://www.gnu.org/copyleft/lgpl.html>
//
// $Id: Synonym.cc,v 1.16 2004/05/28 13:15:20 lha Exp $
//
#ifdef HAVE_CONFIG_H
#include "htconfig.h"
#endif /* HAVE_CONFIG_H */
#include <fcntl.h>
#include "Synonym.h"
#include "htfuzzy.h"
#include "List.h"
#include "StringList.h"
#include "HtConfiguration.h"
#include "filecopy.h"
#include <stdio.h>
#include <stdlib.h>
#include <sys/stat.h>
#ifdef HAVE_STD
#include <fstream>
#ifdef HAVE_NAMESPACES
using namespace std;
#endif
#else
#include <fstream.h>
#endif /* HAVE_STD */
//*****************************************************************************
Synonym::Synonym(const HtConfiguration& config_arg) :
Fuzzy(config_arg)
{
name = "synonyms";
db = 0;
}
//*****************************************************************************
Synonym::~Synonym()
{
if (db)
{
db->Close();
delete db;
db = 0;
}
}
//*****************************************************************************
int
Synonym::createDB(const HtConfiguration &config)
{
String tmpdir = getenv("TMPDIR");
String dbFile;
#if defined(LIBHTDIG) || defined(LIBHTDIGPHP) || defined(_MSC_VER) //WIN32
int ret = -1;
char * source = NULL;
char * dest = NULL;
#endif
if (tmpdir.length())
dbFile = tmpdir;
else
dbFile = "/tmp";
dbFile << "/synonyms.db";
char input[1000];
FILE *fl;
const String sourceFile = config["synonym_dictionary"];
fl = fopen(sourceFile, "r");
if (fl == NULL)
{
cout << "htfuzzy/synonyms: unable to open " << sourceFile << endl;
cout << "htfuzzy/synonyms: Use the 'synonym_dictionary' attribute\n";
cout << "htfuzzy/synonyms: to specify the file that contains the synonyms\n";
return NOTOK;
}
Database *db = Database::getDatabaseInstance(DB_HASH);
if (db->OpenReadWrite(dbFile.get(), 0664) == NOTOK)
{
delete db;
db = 0;
return NOTOK;
}
String data;
String word;
int count = 0;
while (fgets(input, sizeof(input), fl))
{
StringList sl(input, " \t\r\n");
if (sl.Count() < 2)
{ // Avoid segfault caused by calling Database::Put()
if (debug) // with negative length for data field
{
cout<<"htfuzzy/synonyms: Rejected line with less than 2 words: "
<< input << endl;
cout.flush();
}
continue;
}
for (int i = 0; i < sl.Count(); i++)
{
data = 0;
for (int j = 0; j < sl.Count(); j++)
{
if (i != j)
data << sl[j] << ' ';
}
word = sl[i];
word.lowercase();
data.lowercase();
db->Put(word, String(data.get(), data.length() - 1));
if (debug && (count % 10) == 0)
{
cout << "htfuzzy/synonyms: " << count << ' ' << word << "\n";
cout.flush();
}
count++;
}
}
fclose(fl);
db->Close();
delete db;
#if defined(LIBHTDIG) || defined(LIBHTDIGPHP) || defined(_MSC_VER) //WIN32
//Uses file_copy function - works on Unix/Linux & WinNT
source = dbFile.get();
dest = (char *)config["synonym_db"].get();
//Attempt rename, if fail attempt copy & delete.
ret = rename(source, dest);
if (ret < 0)
{
ret = file_copy(source, dest, FILECOPY_OVERWRITE_ON);
if (ret == TRUE)
unlink(source);
else
return NOTOK;
}
if (debug)
{
cout << "htfuzzy/synonyms: " << count << ' ' << word << "\n";
cout << "htfuzzy/synonyms: Done.\n";
}
#else //This code uses a system call - Phase this out
struct stat stat_buf;
String mv("mv"); // assume it's in the PATH if predefined setting fails
if ((stat(MV, &stat_buf) != -1) && S_ISREG(stat_buf.st_mode))
mv = MV;
system(form("%s %s %s",
mv.get(), dbFile.get(), config["synonym_db"].get()));
#endif
return OK;
}
//*****************************************************************************
int
Synonym::openIndex()
{
const String dbFile = config["synonym_db"];
if (db)
{
db->Close();
delete db;
db = 0;
}
db = Database::getDatabaseInstance(DB_HASH);
if (db->OpenRead(dbFile) == NOTOK)
{
delete db;
db = 0;
return NOTOK;
}
return OK;
}
//*****************************************************************************
void
Synonym::getWords(char *originalWord, List &words)
{
String data;
String stripped = originalWord;
HtStripPunctuation(stripped);
if (db && db->Get(stripped, data) == OK)
{
char *token = strtok(data.get(), " ");
while (token)
{
words.Add(new String(token));
token = strtok(0, " ");
}
}
}
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