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/*
* 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);
*/
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.
*/
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);
}
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