/*
 * 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 ParserRuleContext by allowing the value of getRuleIndex to be explicitly set for the context. 
 ParserRuleContext does not include field storage for the rule index since the context classes created by the code generator override the 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.
/**
 * 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 getRuleIndex. /** This is the backing field for {@link #getRuleIndex}. */
	protected int ruleIndex = -1;

	public InterpreterRuleContext() { }

	
Constructs a new InterpreterRuleContext with the specified parent, invoking state, and rule index. 
Params:
parent – The parent context.
invokingStateNumber – The invoking state number.
ruleIndex – The rule index for the current context./**
	 * 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;
	}
}