michael@0: /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
michael@0: /* This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: #ifndef txXPathOptimizer_h__
michael@0: #define txXPathOptimizer_h__
michael@0: 
michael@0: #include "txCore.h"
michael@0: 
michael@0: class Expr;
michael@0: 
michael@0: class txXPathOptimizer
michael@0: {
michael@0: public:
michael@0:     /**
michael@0:      * Optimize the given expression.
michael@0:      * @param aInExpr       Expression to optimize.
michael@0:      * @param aOutExpr      Resulting expression, null if optimization didn't
michael@0:      *                      result in a new expression.
michael@0:      */
michael@0:     nsresult optimize(Expr* aInExpr, Expr** aOutExpr);
michael@0: 
michael@0: private:
michael@0:     // Helper methods for optimizing specific classes
michael@0:     nsresult optimizeStep(Expr* aInExpr, Expr** aOutExpr);
michael@0:     nsresult optimizePath(Expr* aInExpr, Expr** aOutExpr);
michael@0:     nsresult optimizeUnion(Expr* aInExpr, Expr** aOutExpr);
michael@0: };
michael@0: 
michael@0: #endif