Line data    Source code

       1             : /* Copyright (c) 2012-2017 The ANTLR Project. All rights reserved.
       2             :  * Use of this file is governed by the BSD 3-clause license that
       3             :  * can be found in the LICENSE.txt file in the project root.
       4             :  */
       5             : 
       6             : #pragma once
       7             : 
       8             : #include "antlr4-common.h"
       9             : 
      10             : namespace antlr4 {
      11             : namespace tree {
      12             : 
      13           0 :   class ANTLR4CPP_PUBLIC ParseTreeWalker {
      14             :   public:
      15             :     static ParseTreeWalker &DEFAULT;
      16             : 
      17             :     virtual ~ParseTreeWalker();
      18             : 
      19             :     virtual void walk(ParseTreeListener *listener, ParseTree *t) const;
      20             : 
      21             :   protected:
      22             :     /// The discovery of a rule node, involves sending two events: the generic
      23             :     /// <seealso cref="ParseTreeListener#enterEveryRule"/> and a
      24             :     /// <seealso cref="RuleContext"/>-specific event. First we trigger the generic and then
      25             :     /// the rule specific. We do them in reverse order upon finishing the node.
      26             :     virtual void enterRule(ParseTreeListener *listener, ParseTree *r) const;
      27             :     virtual void exitRule(ParseTreeListener *listener, ParseTree *r) const;
      28             :   };
      29             : 
      30             : } // namespace tree
      31             : } // namespace antlr4