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/*
* Copyright (c) 2012-2016 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.
*/
package org.antlr.v4.runtime.tree;
/**
* This interface defines the basic notion of a parse tree visitor. Generated
* visitors implement this interface and the {@code XVisitor} interface for
* grammar {@code X}.
*
* @param <T> The return type of the visit operation. Use {@link Void} for
* operations with no return type.
*/
public interface ParseTreeVisitor<T> {
/**
* Visit a parse tree, and return a user-defined result of the operation.
*
* @param tree The {@link ParseTree} to visit.
* @return The result of visiting the parse tree.
*/
T visit(ParseTree tree);
/**
* Visit the children of a node, and return a user-defined result of the
* operation.
*
* @param node The {@link RuleNode} whose children should be visited.
* @return The result of visiting the children of the node.
*/
T visitChildren(RuleNode node);
/**
* Visit a terminal node, and return a user-defined result of the operation.
*
* @param node The {@link TerminalNode} to visit.
* @return The result of visiting the node.
*/
T visitTerminal(TerminalNode node);
/**
* Visit an error node, and return a user-defined result of the operation.
*
* @param node The {@link ErrorNode} to visit.
* @return The result of visiting the node.
*/
T visitErrorNode(ErrorNode node);
}
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