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// tokenizer.h
/**
* 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.
*/
#pragma once
#include <string>
#include "mongo/base/string_data.h"
#include "mongo/db/fts/fts_language.h"
namespace mongo {
namespace fts {
struct Token {
enum Type { WHITESPACE, DELIMITER, TEXT, INVALID };
Token(Type type, StringData data, unsigned offset) : type(type), data(data), offset(offset) {}
bool ok() const {
return type != INVALID;
}
Type type;
StringData data;
unsigned offset;
};
class Tokenizer {
MONGO_DISALLOW_COPYING(Tokenizer);
public:
Tokenizer(const FTSLanguage* language, StringData str);
bool more() const;
Token next();
private:
Token::Type _type(char c) const;
bool _skipWhitespace();
unsigned _pos;
const StringData _raw;
bool _english;
};
}
}
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