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/**
* Copyright (C) 2018-present MongoDB, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the Server Side Public License, version 1,
* as published by MongoDB, Inc.
*
* 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
* Server Side Public License for more details.
*
* You should have received a copy of the Server Side Public License
* along with this program. If not, see
* <http://www.mongodb.com/licensing/server-side-public-license>.
*
* 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 Server Side 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_basic_tokenizer.h"
#include "mongo/db/fts/fts_query_impl.h"
#include "mongo/db/fts/fts_spec.h"
#include "mongo/db/fts/stemmer.h"
#include "mongo/db/fts/stop_words.h"
#include "mongo/db/fts/tokenizer.h"
#include "mongo/stdx/memory.h"
#include "mongo/util/str.h"
namespace mongo {
namespace fts {
using std::string;
BasicFTSTokenizer::BasicFTSTokenizer(const FTSLanguage* language)
: _language(language), _stemmer(language), _stopWords(StopWords::getStopWords(language)) {}
void BasicFTSTokenizer::reset(StringData document, Options options) {
_options = options;
_document = document.toString();
_tokenizer = stdx::make_unique<Tokenizer>(_language, _document);
}
bool BasicFTSTokenizer::moveNext() {
while (true) {
bool hasMore = _tokenizer->more();
if (!hasMore) {
_stem = "";
return false;
}
Token token = _tokenizer->next();
// Do not return delimiters
if (token.type != Token::TEXT) {
continue;
}
string word = str::toLower(token.data);
// Stop words are case-sensitive so we need them to be lower cased to check
// against the stop word list
if ((_options & FTSTokenizer::kFilterStopWords) && _stopWords->isStopWord(word)) {
continue;
}
if (_options & FTSTokenizer::kGenerateCaseSensitiveTokens) {
word = token.data.toString();
}
_stem = _stemmer.stem(word).toString();
return true;
}
}
StringData BasicFTSTokenizer::get() const {
return _stem;
}
} // namespace fts
} // namespace mongo
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