org.antlr.v4.runtime.atn.PredicateEvalInfo 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.ParserRuleContext;
import org.antlr.v4.runtime.Recognizer;
import org.antlr.v4.runtime.RuleContext;
import org.antlr.v4.runtime.TokenStream;
/**
* This class represents profiling event information for semantic predicate
* evaluations which occur during prediction.
*
* @see ParserATNSimulator#evalSemanticContext
*
* @since 4.3
*/
public class PredicateEvalInfo extends DecisionEventInfo {
/**
* The semantic context which was evaluated.
*/
public final SemanticContext semctx;
/**
* The alternative number for the decision which is guarded by the semantic
* context {@link #semctx}. Note that other ATN
* configurations may predict the same alternative which are guarded by
* other semantic contexts and/or {@link SemanticContext#NONE}.
*/
public final int predictedAlt;
/**
* The result of evaluating the semantic context {@link #semctx}.
*/
public final boolean evalResult;
/**
* Constructs a new instance of the {@link PredicateEvalInfo} class with the
* specified detailed predicate evaluation information.
*
* @param decision The decision number
* @param input The input token stream
* @param startIndex The start index for the current prediction
* @param stopIndex The index at which the predicate evaluation was
* triggered. Note that the input stream may be reset to other positions for
* the actual evaluation of individual predicates.
* @param semctx The semantic context which was evaluated
* @param evalResult The results of evaluating the semantic context
* @param predictedAlt The alternative number for the decision which is
* guarded by the semantic context {@code semctx}. See {@link #predictedAlt}
* for more information.
* @param fullCtx {@code true} if the semantic context was
* evaluated during LL prediction; otherwise, {@code false} if the semantic
* context was evaluated during SLL prediction
*
* @see ParserATNSimulator#evalSemanticContext(SemanticContext, ParserRuleContext, int, boolean)
* @see SemanticContext#eval(Recognizer, RuleContext)
*/
public PredicateEvalInfo(int decision,
TokenStream input, int startIndex, int stopIndex,
SemanticContext semctx,
boolean evalResult,
int predictedAlt,
boolean fullCtx)
{
super(decision, new ATNConfigSet(), input, startIndex, stopIndex, fullCtx);
this.semctx = semctx;
this.evalResult = evalResult;
this.predictedAlt = predictedAlt;
}
}