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/**
* Copyright (C) 2020-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/platform/basic.h"
#include <memory>
#include <string>
#include <utility>
#include <vector>
#include "mongo/bson/bsonmisc.h"
#include "mongo/bson/bsonobj.h"
#include "mongo/bson/oid.h"
#include "mongo/bson/timestamp.h"
#include "mongo/db/cst/key_fieldname.h"
#include "mongo/db/cst/key_value.h"
#include "mongo/platform/decimal128.h"
#include "mongo/stdx/variant.h"
#include "mongo/util/time_support.h"
namespace mongo {
using UserFieldname = std::string;
using NonZeroKey = stdx::variant<int, long long, double, Decimal128>;
// These are the non-compound types from bsonspec.org.
using UserDouble = double;
using UserString = std::string;
using UserBinary = BSONBinData;
struct UserUndefined {};
using UserObjectId = OID;
using UserBoolean = bool;
using UserDate = Date_t;
struct UserNull {};
using UserRegex = BSONRegEx;
using UserDBPointer = BSONDBRef;
using UserJavascript = BSONCode;
using UserSymbol = BSONSymbol;
using UserJavascriptWithScope = BSONCodeWScope;
using UserInt = int;
using UserTimestamp = Timestamp;
using UserLong = long long;
using UserDecimal = Decimal128;
struct UserMinKey {};
struct UserMaxKey {};
struct CNode {
static auto noopLeaf() {
return CNode{ObjectChildren{}};
}
/**
* Produce a string formatted with tabs and endlines that describes the CST underneath this
* CNode.
*/
auto toString() const {
return toStringHelper(0) + "\n";
}
/**
* Produce BSON representing this CST. This is for debugging and testing with structured output,
* not for decompiling to the input query. The produced BSON will consist of arrays, objects,
* and descriptive strings only. This version also returns bool that indicates if the returned
* BSON is a BSONArray.
*/
std::pair<BSONObj, bool> toBsonWithArrayIndicator() const;
/**
* Produce BSON representing this CST. This is for debugging and testing with structured output,
* not for decompiling to the input query. The produced BSON will consist of arrays, objects,
* and descriptive strings only.
*/
BSONObj toBson() const {
return toBsonWithArrayIndicator().first;
}
/*
* Produce the children of this CNode representing an array. Throws a fatal exception if this
* CNode does not represent an array. Const version.
*/
auto& arrayChildren() const {
return stdx::get<ArrayChildren>(payload);
}
/*
* Produce the children of this CNode representing an array. Throws a fatal exception if this
* CNode does not represent an array. Non-const version.
*/
auto& arrayChildren() {
return stdx::get<ArrayChildren>(payload);
}
/*
* Produce the children of this CNode representing an object. Throws a fatal exception if this
* CNode does not represent an object. Const version.
*/
auto& objectChildren() const {
return stdx::get<ObjectChildren>(payload);
}
/*
* Produce the children of this CNode representing an object. Throws a fatal exception if this
* CNode does not represent an object. Non-const version.
*/
auto& objectChildren() {
return stdx::get<ObjectChildren>(payload);
}
/*
* Produce the KeyFieldname of the first element of this CNode representing an object. Throws a
* fatal exception if this CNode does not represent an object, if it is an empty object or if
* the first element does not have a KeyFieldname. Const version.
*/
auto& firstKeyFieldname() const {
dassert(objectChildren().size() > 0);
return stdx::get<KeyFieldname>(objectChildren().begin()->first);
}
/*
* Produce the KeyFieldname of the first element of this CNode representing an object. Throws a
* fatal exception if this CNode does not represent an object, if it is an empty object or if
* the first element does not have a KeyFieldname. Non-const version.
*/
auto& firstKeyFieldname() {
dassert(objectChildren().size() > 0);
return stdx::get<KeyFieldname>(objectChildren().begin()->first);
}
private:
std::string toStringHelper(int numTabs) const;
public:
using Fieldname = stdx::variant<KeyFieldname, UserFieldname>;
using ArrayChildren = std::vector<CNode>;
using ObjectChildren = std::vector<std::pair<Fieldname, CNode>>;
stdx::variant<ArrayChildren,
ObjectChildren,
KeyValue,
NonZeroKey,
UserDouble,
UserString,
UserBinary,
UserUndefined,
UserObjectId,
UserBoolean,
UserDate,
UserNull,
UserRegex,
UserDBPointer,
UserJavascript,
UserSymbol,
UserJavascriptWithScope,
UserInt,
UserTimestamp,
UserLong,
UserDecimal,
UserMinKey,
UserMaxKey>
payload;
};
} // namespace mongo
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