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// expression_parser.h
/**
* 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.
*/
#pragma once
#include <boost/function.hpp>
#include "mongo/base/status.h"
#include "mongo/base/status_with.h"
#include "mongo/db/matcher/expression.h"
#include "mongo/db/matcher/expression_leaf.h"
#include "mongo/db/matcher/expression_tree.h"
namespace mongo {
typedef StatusWith<MatchExpression*> StatusWithMatchExpression;
class MatchExpressionParser {
public:
/**
* caller has to maintain ownership obj
* the tree has views (BSONElement) into obj
*/
static StatusWithMatchExpression parse( const BSONObj& obj ) {
return _parse( obj, true );
}
private:
/**
* 5 = false
{ a : 5 } = false
{ $lt : 5 } = true
{ $ref : "s" } = false
*/
static bool _isExpressionDocument( const BSONElement& e );
static StatusWithMatchExpression _parse( const BSONObj& obj, bool topLevel );
/**
* parses a field in a sub expression
* if the query is { x : { $gt : 5, $lt : 8 } }
* e is { $gt : 5, $lt : 8 }
*/
static Status _parseSub( const char* name,
const BSONObj& obj,
AndMatchExpression* root );
/**
* parses a single field in a sub expression
* if the query is { x : { $gt : 5, $lt : 8 } }
* e is $gt : 5
*/
static StatusWithMatchExpression _parseSubField( const BSONObj& context,
const AndMatchExpression* andSoFar,
const char* name,
const BSONElement& e );
static StatusWithMatchExpression _parseComparison( const char* name,
ComparisonMatchExpression* cmp,
const BSONElement& e );
static StatusWithMatchExpression _parseMOD( const char* name,
const BSONElement& e );
static StatusWithMatchExpression _parseRegexElement( const char* name,
const BSONElement& e );
static StatusWithMatchExpression _parseRegexDocument( const char* name,
const BSONObj& doc );
static Status _parseArrayFilterEntries( ArrayFilterEntries* entries,
const BSONObj& theArray );
// arrays
static StatusWithMatchExpression _parseElemMatch( const char* name,
const BSONElement& e );
static StatusWithMatchExpression _parseAll( const char* name,
const BSONElement& e );
// tree
static Status _parseTreeList( const BSONObj& arr, ListOfMatchExpression* out );
static StatusWithMatchExpression _parseNot( const char* name, const BSONElement& e );
};
typedef boost::function<StatusWithMatchExpression(const char* name, int type, const BSONObj& section)> MatchExpressionParserGeoCallback;
extern MatchExpressionParserGeoCallback expressionParserGeoCallback;
typedef boost::function<StatusWithMatchExpression(const BSONElement& where)> MatchExpressionParserWhereCallback;
extern MatchExpressionParserWhereCallback expressionParserWhereCallback;
}
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