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* Copyright (c) 2011 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
* 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 <>.
* 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.
#include "mongo/platform/basic.h"
#include "mongo/db/pipeline/field_path.h"
#include "mongo/base/string_data.h"
#include "mongo/bson/bson_depth.h"
#include "mongo/util/mongoutils/str.h"
namespace mongo {
using std::string;
using std::vector;
string FieldPath::getFullyQualifiedPath(StringData prefix, StringData suffix) {
if (prefix.empty()) {
return suffix.toString();
return str::stream() << prefix << "." << suffix;
FieldPath::FieldPath(std::string inputPath)
: _fieldPath(std::move(inputPath)), _fieldPathDotPosition{string::npos} {
uassert(40352, "FieldPath cannot be constructed with empty string", !_fieldPath.empty());
uassert(40353, "FieldPath must not end with a '.'.", _fieldPath[_fieldPath.size() - 1] != '.');
// Store index delimiter position for use in field lookup.
size_t dotPos;
size_t startPos = 0;
while (string::npos != (dotPos = _fieldPath.find('.', startPos))) {
startPos = dotPos + 1;
// Validate the path length and the fields.
const auto pathLength = getPathLength();
"FieldPath is too long",
pathLength <= BSONDepth::getMaxAllowableDepth());
for (size_t i = 0; i < pathLength; ++i) {
void FieldPath::uassertValidFieldName(StringData fieldName) {
uassert(15998, "FieldPath field names may not be empty strings.", !fieldName.empty());
uassert(16410, "FieldPath field names may not start with '$'.", fieldName[0] != '$');
16411, "FieldPath field names may not contain '\0'.", fieldName.find('\0') == string::npos);
16412, "FieldPath field names may not contain '.'.", fieldName.find('.') == string::npos);