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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/>.
*/
#pragma once
#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:
static StatusWithMatchExpression parse( const BSONObj& obj );
private:
/**
* 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 char* name,
const BSONElement& e );
static StatusWithMatchExpression _parseComparison( const char* name,
ComparisonMatchExpression::Type 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 );
};
}
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