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/codegen/model/CodeBlockForOuterMostAlt.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.codegen.model;

import org.antlr.v4.codegen.OutputModelFactory;
import org.antlr.v4.tool.Alternative;

/** The code associated with the outermost alternative of a rule.
 *  Sometimes we might want to treat them differently in the
 *  code generation.
 */
public class CodeBlockForOuterMostAlt extends CodeBlockForAlt {
	/**
	 * The label for the alternative; or null if the alternative is not labeled.
	 */
	public String altLabel;
	/**
	 * The alternative.
	 */
	public Alternative alt;

	public CodeBlockForOuterMostAlt(OutputModelFactory factory, Alternative alt) {
		super(factory);
		this.alt = alt;
		altLabel = alt.ast.altLabel!=null ? alt.ast.altLabel.getText() : null;
	}
}

⏎ org/antlr/v4/codegen/model/CodeBlockForOuterMostAlt.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