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/misc/MutableInt.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.misc;

public class MutableInt extends Number implements Comparable<MutableInt> {
	public int v;

	public MutableInt(int v) { this.v = v; }

	@Override
	public boolean equals(Object o) {
		if ( o instanceof Number ) return v == ((Number)o).intValue();
		return false;
	}

	@Override public int hashCode() { return v; }

	@Override public int compareTo(MutableInt o) { return v-o.intValue(); }
	@Override public int intValue() { return v; }
	@Override public long longValue() { return v; }
	@Override public float floatValue() { return v; }
	@Override public double doubleValue() { return v; }

	@Override
	public String toString() {
		return String.valueOf(v);
	}
}

⏎ org/antlr/v4/misc/MutableInt.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