org.antlr.v4.runtime.atn.LookaheadEventInfo Maven / Gradle / Ivy
/*
* 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.atn;
import org.antlr.v4.runtime.TokenStream;
/**
* This class represents profiling event information for tracking the lookahead
* depth required in order to make a prediction.
*
* @since 4.3
*/
public class LookaheadEventInfo extends DecisionEventInfo {
/** The alternative chosen by adaptivePredict(), not necessarily
* the outermost alt shown for a rule; left-recursive rules have
* user-level alts that differ from the rewritten rule with a (...) block
* and a (..)* loop.
*/
public int predictedAlt;
/**
* Constructs a new instance of the {@link LookaheadEventInfo} class with
* the specified detailed lookahead information.
*
* @param decision The decision number
* @param configs The final configuration set containing the necessary
* information to determine the result of a prediction, or {@code null} if
* the final configuration set is not available
* @param input The input token stream
* @param startIndex The start index for the current prediction
* @param stopIndex The index at which the prediction was finally made
* @param fullCtx {@code true} if the current lookahead is part of an LL
* prediction; otherwise, {@code false} if the current lookahead is part of
* an SLL prediction
*/
public LookaheadEventInfo(int decision,
ATNConfigSet configs,
int predictedAlt,
TokenStream input, int startIndex, int stopIndex,
boolean fullCtx)
{
super(decision, configs, input, startIndex, stopIndex, fullCtx);
this.predictedAlt = predictedAlt;
}
}