/*
 * 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.tool.ast;

A simple visitor, based upon the classic double dispatch method,
 for walking GrammarAST trees resulting from parsing ANTLR grammars.
 There is also the GrammarTreeVisitor.g tree grammar that looks for
 subtree patterns and fires off high-level events as opposed to
 "found node" events like this visitor does. Also, like all
 visitors, the users of this interface are required to implement
 the node visitation of the children. The GrammarTreeVisitor mechanism
 fires events and the user is not required to do any walking code.
 GrammarAST t = ...;
 GrammarASTVisitor v = new ...;
 t.visit(v);
/** A simple visitor, based upon the classic double dispatch method,
 *  for walking GrammarAST trees resulting from parsing ANTLR grammars.
 *  There is also the GrammarTreeVisitor.g tree grammar that looks for
 *  subtree patterns and fires off high-level events as opposed to
 *  "found node" events like this visitor does. Also, like all
 *  visitors, the users of this interface are required to implement
 *  the node visitation of the children. The GrammarTreeVisitor mechanism
 *  fires events and the user is not required to do any walking code.
 *
 *  GrammarAST t = ...;
 *  GrammarASTVisitor v = new ...;
 *  t.visit(v);
 */
public interface GrammarASTVisitor {
	
This is the generic visitor method that will be invoked
 for any other kind of AST node not covered by the other visit methods.
/** This is the generic visitor method that will be invoked
	 *  for any other kind of AST node not covered by the other visit methods.
	 */
	Object visit(GrammarAST node);

	Object visit(GrammarRootAST node);
	Object visit(RuleAST node);

	Object visit(BlockAST node);
	Object visit(OptionalBlockAST node);
	Object visit(PlusBlockAST node);
	Object visit(StarBlockAST node);

	Object visit(AltAST node);

	Object visit(NotAST node);
	Object visit(PredAST node);
	Object visit(RangeAST node);
	Object visit(SetAST node);
	Object visit(RuleRefAST node);
	Object visit(TerminalAST node);
}