ANTLR is a powerful parser generator for multiple programming languages including Java.

ANTLR contains 2 major modules:

• Runtime - For building and executing parsers/lexers generated in Java.
• Tool (The Parser Generator) - For generating parsers/lexers Java class.

ANTLR Tool Source Code files are provided in the distribution packge (antlr4-4.10.1.zip). You can download them at ANTLR Website.

You can also browse the source code below:

⏎ org/antlr/v4/tool/ast/RuleRefAST.java

/*
 * 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;

import org.antlr.runtime.CommonToken;
import org.antlr.runtime.Token;

public class RuleRefAST extends GrammarASTWithOptions implements RuleElementAST {
	public RuleRefAST(RuleRefAST node) {
		super(node);
	}

	public RuleRefAST(Token t) { super(t); }
    public RuleRefAST(int type) { super(type); }
    public RuleRefAST(int type, Token t) { super(type, t); }

	/** Dup token too since we overwrite during LR rule transform */
	@Override
	public RuleRefAST dupNode() {
		RuleRefAST r = new RuleRefAST(this);
		// In LR transform, we alter original token stream to make e -> e[n]
		// Since we will be altering the dup, we need dup to have the
		// original token.  We can set this tree (the original) to have
		// a new token.
		r.token = this.token;
		this.token = new CommonToken(r.token);
		return r;
	}

	@Override
	public Object visit(GrammarASTVisitor v) { return v.visit(this); }
}

⏎ org/antlr/v4/tool/ast/RuleRefAST.java

Or download all of them as a single archive file:

File name: antlr-tool-4.10.1-sources.jar
File size: 347718 bytes
Release date: 2022-04-15
Download 

⇒ Donwload antlr4-4.10.1.zip

⇐ ANTLR Runtime Source Code

⇑ Download and Review ANTLR Parser Generator

⇑⇑ FAQ for ANTLR Parser Generator