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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/status.h"
namespace mongo {
class FieldRef;
namespace fieldchecker {
/**
* Returns OK if all the below conditions on 'field' are valid:
* + Non-empty
* + Does not start or end with a '.'
* Otherwise returns a code indicating cause of failure.
*/
Status isUpdatable(const FieldRef& field);
/**
* Returns true iff 'field' is the position element (which is "$").
*/
bool isPositionalElement(const StringData& field);
/**
* Returns true, the position 'pos' of the first $-sign if present in 'fieldRef', and
* how many other $-signs were found in 'count'. Otherwise return false.
*
* Note:
* isPositional assumes that the field is updatable. Call isUpdatable() above to
* verify.
*/
bool isPositional(const FieldRef& fieldRef, size_t* pos, size_t* count = NULL);
/**
* Returns true iff 'field' is an array filter (matching the regular expression /\$\[.*\]/).
*/
bool isArrayFilterIdentifier(const StringData& field);
/**
* Returns true if isArrayFilterIdentifier is true for any component in 'fieldRef' or returns false
otherwise.
*/
bool hasArrayFilter(const FieldRef& fieldRef);
} // namespace fieldchecker
} // namespace mongo
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