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With inspiration from other libraries

There is a newer version: 2.12.15

/*
 * 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.
 */

package org.antlr.v4.runtime.tree;

import org.antlr.v4.runtime.Parser;
import org.antlr.v4.runtime.RuleContext;
import org.antlr.v4.runtime.Token;

/** An interface to access the tree of {@link RuleContext} objects created
 *  during a parse that makes the data structure look like a simple parse tree.
 *  This node represents both internal nodes, rule invocations,
 *  and leaf nodes, token matches.
 *
 *  The payload is either a {@link Token} or a {@link RuleContext} object.
 */
public interface ParseTree extends SyntaxTree {
	// the following methods narrow the return type; they are not additional methods
	@Override
	ParseTree getParent();
	@Override
	ParseTree getChild(int i);


	/** Set the parent for this node.
	 *
	 *  This is not backward compatible as it changes
	 *  the interface but no one was able to create custom
	 *  nodes anyway so I'm adding as it improves internal
	 *  code quality.
	 *
	 *  One could argue for a restructuring of
	 *  the class/interface hierarchy so that
	 *  setParent, addChild are moved up to Tree
	 *  but that's a major change. So I'll do the
	 *  minimal change, which is to add this method.
	 *
	 *  @since 4.7
	 */
	void setParent(RuleContext parent);

	/** The {@link ParseTreeVisitor} needs a double dispatch method. */
	 T accept(ParseTreeVisitor visitor);

	/** Return the combined text of all leaf nodes. Does not get any
	 *  off-channel tokens (if any) so won't return whitespace and
	 *  comments if they are sent to parser on hidden channel.
	 */
	String getText();

	/** Specialize toStringTree so that it can print out more information
	 * 	based upon the parser.
	 */
	String toStringTree(Parser parser);
}