dom/xslt/xpath/txXPathOptimizer.h

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* This Source Code Form is subject to the terms of the Mozilla Public
   3  * License, v. 2.0. If a copy of the MPL was not distributed with this
   4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   5
   6 #ifndef txXPathOptimizer_h__
   7 #define txXPathOptimizer_h__
   8
   9 #include "txCore.h"
  10
  11 class Expr;
  12
  13 class txXPathOptimizer {
  14  public:
  15   /**
  16    * Optimize the given expression.
  17    * @param aInExpr       Expression to optimize.
  18    * @param aOutExpr      Resulting expression, null if optimization didn't
  19    *                      result in a new expression.
  20    */
  21   void optimize(Expr* aInExpr, Expr** aOutExpr);
  22
  23  private:
  24   // Helper methods for optimizing specific classes
  25   void optimizeStep(Expr* aInExpr, Expr** aOutExpr);
  26   void optimizePath(Expr* aInExpr, Expr** aOutExpr);
  27   void optimizeUnion(Expr* aInExpr, Expr** aOutExpr);
  28 };
  29
  30 #endif