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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.
*/
#pragma once
#include "mongo/base/string_data.h"
namespace mongo {
namespace fts {
struct QueryToken {
enum Type { WHITESPACE, DELIMITER, TEXT, INVALID };
QueryToken(Type type, StringData data, unsigned offset, bool previousWhiteSpace)
: type(type), data(data), offset(offset), previousWhiteSpace(previousWhiteSpace) {}
bool ok() const {
return type != INVALID;
}
Type type;
StringData data;
unsigned offset;
bool previousWhiteSpace;
};
/**
* The pseudo EXBNF for the query parsing language is:
*
* SEARCH STRING = TOKEN_LIST ( ' ' TOKEN_LIST )*
*
* TOKEN_LIST = SEARCH_TOKEN
* |'-' SEARCH_TOKEN
* | QUOTED_SEARCH_TOKEN
* |'-' QUOTED_SEARCH_TOKEN
*
* QUOTED_SEARCH_TOKEN = '“' SEARCH_TOKEN+ '"'
*
* SEARCH_TOKEN = CHARACTER_EXCLUDING_SPECIAL_CHARS
*
* SPECIAL_CHARS = '-' | ' ' | '"'
*/
class FTSQueryParser {
FTSQueryParser(const FTSQueryParser&) = delete;
FTSQueryParser& operator=(const FTSQueryParser&) = delete;
public:
FTSQueryParser(StringData str);
bool more() const;
QueryToken next();
private:
QueryToken::Type getType(char c) const;
bool skipWhitespace();
unsigned _pos;
bool _previousWhiteSpace;
const StringData _raw;
};
}
}
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