org.antlr.v4.runtime.atn.ContextSensitivityInfo 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.ANTLRErrorListener;
import org.antlr.v4.runtime.TokenStream;
/**
* This class represents profiling event information for a context sensitivity.
* Context sensitivities are decisions where a particular input resulted in an
* SLL conflict, but LL prediction produced a single unique alternative.
*
*
* In some cases, the unique alternative identified by LL prediction is not
* equal to the minimum represented alternative in the conflicting SLL
* configuration set. Grammars and inputs which result in this scenario are
* unable to use {@link PredictionMode#SLL}, which in turn means they cannot use
* the two-stage parsing strategy to improve parsing performance for that
* input.
*
* @see ParserATNSimulator#reportContextSensitivity
* @see ANTLRErrorListener#reportContextSensitivity
*
* @since 4.3
*/
public class ContextSensitivityInfo extends DecisionEventInfo {
/**
* Constructs a new instance of the {@link ContextSensitivityInfo} class
* with the specified detailed context sensitivity information.
*
* @param decision The decision number
* @param configs The final configuration set containing the unique
* alternative identified by full-context prediction
* @param input The input token stream
* @param startIndex The start index for the current prediction
* @param stopIndex The index at which the context sensitivity was
* identified during full-context prediction
*/
public ContextSensitivityInfo(int decision,
ATNConfigSet configs,
TokenStream input, int startIndex, int stopIndex)
{
super( decision, configs, input, startIndex, stopIndex, true);
}
}