txXPathOptimizer.h

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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

/* This Source Code Form is subject to the terms of the Mozilla Public

 * License, v. 2.0. If a copy of the MPL was not distributed with this

 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#ifndef txXPathOptimizer_h__

#define txXPathOptimizer_h__

#include "txCore.h"

class Expr;

class txXPathOptimizer {

 public:

/**

   * Optimize the given expression.

   * @param aInExpr       Expression to optimize.

   * @param aOutExpr      Resulting expression, null if optimization didn't

   *                      result in a new expression.

*/

  void optimize(Expr* aInExpr, Expr** aOutExpr);

 private:

  // Helper methods for optimizing specific classes

  void optimizeStep(Expr* aInExpr, Expr** aOutExpr);

  void optimizePath(Expr* aInExpr, Expr** aOutExpr);

  void optimizeUnion(Expr* aInExpr, Expr** aOutExpr);

};

#endif