Package org.antlr.v4.runtime.atn

Class PredicateEvalInfo

java.lang.Object

org.antlr.v4.runtime.atn.DecisionEventInfo

org.antlr.v4.runtime.atn.PredicateEvalInfo

public class PredicateEvalInfo
extends DecisionEventInfo

This class represents profiling event information for semantic predicate evaluations which occur during prediction.

Since:

4.3

See Also:

• ParserATNSimulator.evalSemanticContext(org.antlr.v4.runtime.dfa.DFAState.PredPrediction[], org.antlr.v4.runtime.ParserRuleContext, boolean)

Field Summary

Fields

Modifier and Type	Field	Description
final boolean	evalResult	The result of evaluating the semantic context semctx.
final int	predictedAlt	The alternative number for the decision which is guarded by the semantic context semctx.
final SemanticContext	semctx	The semantic context which was evaluated.

Fields inherited from class org.antlr.v4.runtime.atn.DecisionEventInfo

decision, fullCtx, input, startIndex, state, stopIndex

Constructor Summary

Constructors

Constructor	Description
PredicateEvalInfo(SimulatorState state, int decision, TokenStream input, int startIndex, int stopIndex, SemanticContext semctx, boolean evalResult, int predictedAlt)	Constructs a new instance of the PredicateEvalInfo class with the specified detailed predicate evaluation information.

Method Summary

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

semctx

public final SemanticContext semctx

The semantic context which was evaluated.

predictedAlt

public final int predictedAlt

The alternative number for the decision which is guarded by the semantic context semctx. Note that other ATN configurations may predict the same alternative which are guarded by other semantic contexts and/or SemanticContext.NONE.

evalResult

public final boolean evalResult

The result of evaluating the semantic context semctx.

Constructor Details

PredicateEvalInfo

public PredicateEvalInfo(@NotNull
 SimulatorState state,
 int decision,
 @NotNull
 TokenStream input,
 int startIndex,
 int stopIndex,
 @NotNull
 SemanticContext semctx,
 boolean evalResult,
 int predictedAlt)

Constructs a new instance of the PredicateEvalInfo class with the specified detailed predicate evaluation information.

Parameters:

state - The simulator state

decision - The decision number

input - The input token stream

startIndex - The start index for the current prediction

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.

semctx - The semantic context which was evaluated

evalResult - The results of evaluating the semantic context

predictedAlt - The alternative number for the decision which is guarded by the semantic context semctx. See predictedAlt for more information.

See Also:

• ParserATNSimulator.evalSemanticContext(SemanticContext, ParserRuleContext, int)
• SemanticContext.eval(Recognizer, RuleContext)