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The ANTLR 4 grammar compiler.

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/*
 * Copyright (c) 2012 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);

	/** 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);
}