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// expression_parser_tree.cpp
/**
* 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.
*/
#include "mongo/db/matcher/expression_parser.h"
#include "mongo/bson/bsonobj.h"
#include "mongo/bson/bsonobjbuilder.h"
#include "mongo/db/matcher/expression_array.h"
#include "mongo/db/matcher/expression_leaf.h"
#include "mongo/db/matcher/expression_tree.h"
#include "mongo/stdx/memory.h"
#include "mongo/util/mongoutils/str.h"
namespace mongo {
Status MatchExpressionParser::_parseTreeList(const BSONObj& arr,
ListOfMatchExpression* out,
const boost::intrusive_ptr<ExpressionContext>& expCtx,
AllowedFeatureSet allowedFeatures,
DocumentParseLevel currentLevel) {
if (arr.isEmpty())
return Status(ErrorCodes::BadValue, "$and/$or/$nor must be a nonempty array");
BSONObjIterator i(arr);
while (i.more()) {
BSONElement e = i.next();
if (e.type() != Object)
return Status(ErrorCodes::BadValue, "$or/$and/$nor entries need to be full objects");
StatusWithMatchExpression sub = _parse(e.Obj(), expCtx, allowedFeatures, currentLevel);
if (!sub.isOK())
return sub.getStatus();
out->add(sub.getValue().release());
}
return Status::OK();
}
StatusWithMatchExpression MatchExpressionParser::_parseNot(
const char* name,
const BSONElement& e,
const boost::intrusive_ptr<ExpressionContext>& expCtx,
AllowedFeatureSet allowedFeatures,
DocumentParseLevel currentLevel) {
if (e.type() == RegEx) {
StatusWithMatchExpression s = _parseRegexElement(name, e);
if (!s.isOK())
return s;
std::unique_ptr<NotMatchExpression> n =
stdx::make_unique<NotMatchExpression>(s.getValue().release());
return {std::move(n)};
}
uassert(ErrorCodes::BadValue, "$not needs a regex or a document", e.type() == Object);
BSONObj notObject = e.Obj();
uassert(ErrorCodes::BadValue, "$not cannot be empty", !notObject.isEmpty());
std::unique_ptr<AndMatchExpression> theAnd = stdx::make_unique<AndMatchExpression>();
Status s = _parseSub(name, notObject, theAnd.get(), expCtx, allowedFeatures, currentLevel);
if (!s.isOK())
return StatusWithMatchExpression(s);
// TODO: this seems arbitrary?
// tested in jstests/not2.js
for (unsigned i = 0; i < theAnd->numChildren(); i++)
if (theAnd->getChild(i)->matchType() == MatchExpression::REGEX)
return StatusWithMatchExpression(ErrorCodes::BadValue, "$not cannot have a regex");
std::unique_ptr<NotMatchExpression> theNot =
stdx::make_unique<NotMatchExpression>(theAnd.release());
return {std::move(theNot)};
}
}
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