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/*
* [The "BSD license"]
* Copyright (c) 2012 Terence Parr
* Copyright (c) 2012 Sam Harwell
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package org.antlr.v4.runtime.tree;
import org.antlr.v4.runtime.misc.NotNull;
/**
* 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 The return type of the visit operation. Use {@link Void} for
* operations with no return type.
*/
public interface ParseTreeVisitor {
/**
* 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(@NotNull 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(@NotNull 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(@NotNull 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(@NotNull ErrorNode node);
}