/*
* 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 PredictionMode.SLL
, which in turn means they cannot use the two-stage parsing strategy to improve parsing performance for that input.
See Also: Since: 4.3
/**
* 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.
*
* <p>
* 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.</p>
*
* @see ParserATNSimulator#reportContextSensitivity
* @see ANTLRErrorListener#reportContextSensitivity
*
* @since 4.3
*/
public class ContextSensitivityInfo extends DecisionEventInfo {
Constructs a new instance of the ContextSensitivityInfo
class with the specified detailed context sensitivity information. Params: - decision – The decision number
- configs – The final configuration set containing the unique
alternative identified by full-context prediction
- input – The input token stream
- startIndex – The start index for the current prediction
- stopIndex – The index at which the context sensitivity was
identified during full-context prediction
/**
* 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);
}
}