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/decl/AltLabelStructDecl.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.decl;

import org.antlr.v4.codegen.OutputModelFactory;
import org.antlr.v4.codegen.model.DispatchMethod;
import org.antlr.v4.codegen.model.ListenerDispatchMethod;
import org.antlr.v4.codegen.model.VisitorDispatchMethod;
import org.antlr.v4.tool.Rule;

import java.util.ArrayList;

/** A StructDecl to handle a -> label on alt */
public class AltLabelStructDecl extends StructDecl {
	public int altNum;
	public String parentRule;
	public AltLabelStructDecl(OutputModelFactory factory, Rule r,
							  int altNum, String label)
	{
		// override name set in super to the label ctx
		super(factory, r, factory.getGenerator().getTarget().getAltLabelContextStructName(label));
		this.altNum = altNum;
		this.parentRule = r.name;
		derivedFromName = label;
	}

	@Override
	public void addDispatchMethods(Rule r) {
		dispatchMethods = new ArrayList<DispatchMethod>();
		if ( factory.getGrammar().tool.gen_listener ) {
			dispatchMethods.add(new ListenerDispatchMethod(factory, true));
			dispatchMethods.add(new ListenerDispatchMethod(factory, false));
		}
		if ( factory.getGrammar().tool.gen_visitor ) {
			dispatchMethods.add(new VisitorDispatchMethod(factory));
		}
	}

	@Override
	public int hashCode() {
		return name.hashCode();
	}

	@Override
	public boolean equals(Object obj) {
		if ( obj == this ) return true;
		if (!(obj instanceof AltLabelStructDecl)) return false;

		return name.equals(((AltLabelStructDecl)obj).name);
	}
}

⏎ org/antlr/v4/codegen/model/decl/AltLabelStructDecl.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