/* Copyright (c) 2012-2017 The ANTLR Project. All rights reserved. * Use of this file is governed by the BSD 3-clause license that * can be found in the LICENSE.txt file in the project root. */ #pragma once #include "antlr4-common.h" namespace antlr4 { namespace tree { class ANTLR4CPP_PUBLIC ParseTreeWalker { public: static ParseTreeWalker &DEFAULT; virtual ~ParseTreeWalker(); virtual void walk(ParseTreeListener *listener, ParseTree *t) const; protected: /// The discovery of a rule node, involves sending two events: the generic /// and a /// -specific event. First we trigger the generic and then /// the rule specific. We do them in reverse order upon finishing the node. virtual void enterRule(ParseTreeListener *listener, ParseTree *r) const; virtual void exitRule(ParseTreeListener *listener, ParseTree *r) const; }; } // namespace tree } // namespace antlr4