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 Runtime 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/runtime/InterpreterRuleContext.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.runtime;

/**
 * This class extends {@link ParserRuleContext} by allowing the value of
 * {@link #getRuleIndex} to be explicitly set for the context.
 *
 * <p>
 * {@link ParserRuleContext} does not include field storage for the rule index
 * since the context classes created by the code generator override the
 * {@link #getRuleIndex} method to return the correct value for that context.
 * Since the parser interpreter does not use the context classes generated for a
 * parser, this class (with slightly more memory overhead per node) is used to
 * provide equivalent functionality.</p>
 */
public class InterpreterRuleContext extends ParserRuleContext {
	/** This is the backing field for {@link #getRuleIndex}. */
	protected int ruleIndex = -1;

	public InterpreterRuleContext() { }

	/**
	 * Constructs a new {@link InterpreterRuleContext} with the specified
	 * parent, invoking state, and rule index.
	 *
	 * @param parent The parent context.
	 * @param invokingStateNumber The invoking state number.
	 * @param ruleIndex The rule index for the current context.
	 */
	public InterpreterRuleContext(ParserRuleContext parent,
								  int invokingStateNumber,
								  int ruleIndex)
	{
		super(parent, invokingStateNumber);
		this.ruleIndex = ruleIndex;
	}

	@Override
	public int getRuleIndex() {
		return ruleIndex;
	}
}

⏎ org/antlr/v4/runtime/InterpreterRuleContext.java

Or download all of them as a single archive file:

File name: antlr-runtime-4.10.1-sources.jar
File size: 308953 bytes
Release date: 2022-04-15
Download 

⇒ ANTLR Tool Source Code

⇐ What Is ANTLR Parser Generator

⇑ Download and Review ANTLR Parser Generator

⇑⇑ FAQ for ANTLR Parser Generator