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Contents
/* 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() = default;
/**
* <summary>
* Performs a walk on the given parse tree starting at the root and going down recursively
* with depth-first search. On each node, <seealso cref="ParseTreeWalker#enterRule"/> is called before
* recursively walking down into child nodes, then
* <seealso cref="ParseTreeWalker#exitRule"/> is called after the recursive call to wind up.
* </summary>
* <param name='listener'> The listener used by the walker to process grammar rules </param>
* <param name='t'> The parse tree to be walked on </param>
*/
virtual void walk(ParseTreeListener *listener, ParseTree *t) const;
protected:
/**
* <summary>
* Enters a grammar rule by first triggering the generic event <seealso cref="ParseTreeListener#enterEveryRule"/>
* then by triggering the event specific to the given parse tree node
* </summary>
* <param name='listener'> The listener responding to the trigger events </param>
* <param name='r'> The grammar rule containing the rule context </param>
*/
virtual void enterRule(ParseTreeListener *listener, ParseTree *r) const;
/**
* <summary>
* Exits a grammar rule by first triggering the event specific to the given parse tree node
* then by triggering the generic event <seealso cref="ParseTreeListener#exitEveryRule"/>
* </summary>
* <param name='listener'> The listener responding to the trigger events </param>
* <param name='r'> The grammar rule containing the rule context </param>
*/
virtual void exitRule(ParseTreeListener *listener, ParseTree *r) const;
};
} // namespace tree
} // namespace antlr4
Version data entries
19 entries across 19 versions & 3 rubygems