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// stemmer.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 <cstdlib>
#include <string>
#include "mongo/db/fts/stemmer.h"
#include "mongo/util/mongoutils/str.h"
namespace mongo {
namespace fts {
using std::string;
Stemmer::Stemmer(const FTSLanguage* language) {
_stemmer = NULL;
if (language->str() != "none")
_stemmer = sb_stemmer_new(language->str().c_str(), "UTF_8");
}
Stemmer::~Stemmer() {
if (_stemmer) {
sb_stemmer_delete(_stemmer);
_stemmer = NULL;
}
}
string Stemmer::stem(StringData word) const {
if (!_stemmer)
return word.toString();
const sb_symbol* sb_sym =
sb_stemmer_stem(_stemmer, (const sb_symbol*)word.rawData(), word.size());
if (sb_sym == NULL) {
// out of memory
invariant(false);
}
return string((const char*)(sb_sym), sb_stemmer_length(_stemmer));
}
}
}
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