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// fts_matcher.cpp
/**
* Copyright (C) 2012 10gen Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the GNU Affero General Public License in all respects for
* all of the code used other than as permitted herein. If you modify file(s)
* with this exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version. If you delete this
* exception statement from all source files in the program, then also delete
* it in the license file.
*/
#include "mongo/platform/basic.h"
#include "mongo/db/fts/fts_matcher.h"
#include "mongo/db/fts/fts_element_iterator.h"
#include "mongo/platform/strcasestr.h"
namespace mongo {
namespace fts {
using std::string;
FTSMatcher::FTSMatcher( const FTSQuery& query, const FTSSpec& spec )
: _query( query ),
_spec( spec ) {
}
/*
* Checks if the obj contains any of the negTerms, if so returns true, otherwise false
* @param obj, object to be checked
*/
bool FTSMatcher::hasNegativeTerm(const BSONObj& obj ) const {
// called during search. deals with the case in which we have a term
// flagged for exclusion, i.e. "hello -world" we want to remove all
// results that include "world"
if ( _query.getNegatedTerms().size() == 0 ) {
return false;
}
FTSElementIterator it( _spec, obj);
while ( it.more() ) {
FTSIteratorValue val = it.next();
if (_hasNegativeTerm_string( val._language, val._text )) {
return true;
}
}
return false;
}
/*
* Checks if any of the negTerms is in the tokenized string
* @param raw, the raw string to be tokenized
*/
bool FTSMatcher::_hasNegativeTerm_string( const FTSLanguage* language,
const string& raw ) const {
Tokenizer i( *language, raw );
Stemmer stemmer( *language );
while ( i.more() ) {
Token t = i.next();
if ( t.type != Token::TEXT )
continue;
string word = stemmer.stem( tolowerString( t.data ) );
if ( _query.getNegatedTerms().count( word ) > 0 )
return true;
}
return false;
}
bool FTSMatcher::phrasesMatch( const BSONObj& obj ) const {
for (unsigned i = 0; i < _query.getPhr().size(); i++ ) {
if ( !phraseMatch( _query.getPhr()[i], obj ) ) {
return false;
}
}
for (unsigned i = 0; i < _query.getNegatedPhr().size(); i++ ) {
if ( phraseMatch( _query.getNegatedPhr()[i], obj ) ) {
return false;
}
}
return true;
}
/**
* Checks if phrase is exactly matched in obj, returns true if so, false otherwise
* @param phrase, the string to be matched
* @param obj, document in the collection to match against
*/
bool FTSMatcher::phraseMatch( const string& phrase, const BSONObj& obj ) const {
FTSElementIterator it( _spec, obj);
while ( it.more() ) {
FTSIteratorValue val = it.next();
if (_phraseMatches( phrase, val._text )) {
return true;
}
}
return false;
}
/*
* Looks for phrase in a raw string
* @param phrase, phrase to match
* @param haystack, raw string to be parsed
*/
bool FTSMatcher::_phraseMatches( const string& phrase, const string& haystack ) const {
return strcasestr( haystack.c_str(), phrase.c_str() ) != NULL;
}
}
}
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