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// expression_parser_tree.cpp
/**
* Copyright (C) 2013 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
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* 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 <http://www.gnu.org/licenses/>.
*
* 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/db/matcher/expression_parser.h"
#include "mongo/bson/bsonobj.h"
#include "mongo/bson/bsonobjbuilder.h"
#include "mongo/bson/bsonobjiterator.h"
#include "mongo/bson/bson-inl.h"
#include "mongo/db/matcher/expression_array.h"
#include "mongo/db/matcher/expression_leaf.h"
#include "mongo/db/matcher/expression_tree.h"
#include "mongo/util/log.h"
#include "mongo/util/mongoutils/str.h"
namespace mongo {
Status MatchExpressionParser::_parseTreeList( const BSONObj& arr, ListOfMatchExpression* out ) {
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(), false );
if ( !sub.isOK() )
return sub.getStatus();
out->add( sub.getValue() );
}
return Status::OK();
}
StatusWithMatchExpression MatchExpressionParser::_parseNot( const char* name,
const BSONElement& e ) {
if ( e.type() == RegEx ) {
StatusWithMatchExpression s = _parseRegexElement( name, e );
if ( !s.isOK() )
return s;
std::auto_ptr<NotMatchExpression> n( new NotMatchExpression() );
Status s2 = n->init( s.getValue() );
if ( !s2.isOK() )
return StatusWithMatchExpression( s2 );
return StatusWithMatchExpression( n.release() );
}
if ( e.type() != Object )
return StatusWithMatchExpression( ErrorCodes::BadValue, "$not needs a regex or a document" );
BSONObj notObject = e.Obj();
if ( notObject.isEmpty() )
return StatusWithMatchExpression( ErrorCodes::BadValue, "$not cannot be empty" );
std::auto_ptr<AndMatchExpression> theAnd( new AndMatchExpression() );
Status s = _parseSub( name, notObject, theAnd.get() );
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::auto_ptr<NotMatchExpression> theNot( new NotMatchExpression() );
s = theNot->init( theAnd.release() );
if ( !s.isOK() )
return StatusWithMatchExpression( s );
return StatusWithMatchExpression( theNot.release() );
}
}
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