dom/xslt/xpath/txXPathOptimizer.h

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   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 {
  15 public:
  16     /**
  17      * Optimize the given expression.
  18      * @param aInExpr       Expression to optimize.
  19      * @param aOutExpr      Resulting expression, null if optimization didn't
  20      *                      result in a new expression.
  21      */
  22     nsresult optimize(Expr* aInExpr, Expr** aOutExpr);
  23
  24 private:
  25     // Helper methods for optimizing specific classes
  26     nsresult optimizeStep(Expr* aInExpr, Expr** aOutExpr);
  27     nsresult optimizePath(Expr* aInExpr, Expr** aOutExpr);
  28     nsresult optimizeUnion(Expr* aInExpr, Expr** aOutExpr);
  29 };
  30
  31 #endif