Package org.antlr.v4.runtime.atn

Class EpsilonTransition

java.lang.Object

org.antlr.v4.runtime.atn.Transition

org.antlr.v4.runtime.atn.EpsilonTransition

public final class EpsilonTransition
extends Transition

Field Summary

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

ACTION, ATOM, EPSILON, NOT_SET, PRECEDENCE, PREDICATE, RANGE, RULE, serializationNames, serializationTypes, SET, target, WILDCARD

Constructor Summary

Constructors

Constructor	Description
EpsilonTransition(ATNState target)
EpsilonTransition(ATNState target, int outermostPrecedenceReturn)

Method Summary

Modifier and Type	Method	Description
int	getSerializationType()
boolean	isEpsilon()	Determines if the transition is an "epsilon" transition.
boolean	matches(int symbol, int minVocabSymbol, int maxVocabSymbol)
int	outermostPrecedenceReturn()
String	toString()

Methods inherited from class org.antlr.v4.runtime.atn.Transition

label

Methods inherited from class java.lang.Object

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

Constructor Detail

EpsilonTransition

public EpsilonTransition(ATNState target)

EpsilonTransition

public EpsilonTransition(ATNState target,
                         int outermostPrecedenceReturn)

Method Detail

outermostPrecedenceReturn

public int outermostPrecedenceReturn()

Returns:

the rule index of a precedence rule for which this transition is returning from, where the precedence value is 0; otherwise, -1.

Since:

4.4.1

See Also:

ATNConfig.isPrecedenceFilterSuppressed(), ParserATNSimulator.applyPrecedenceFilter(ATNConfigSet)

getSerializationType

public int getSerializationType()

Specified by:

getSerializationType in class Transition

isEpsilon

public boolean isEpsilon()

Description copied from class: Transition

Determines if the transition is an "epsilon" transition.

The default implementation returns false.

Overrides:

isEpsilon in class Transition

Returns:

true if traversing this transition in the ATN does not consume an input symbol; otherwise, false if traversing this transition consumes (matches) an input symbol.

matches

public boolean matches(int symbol,
                       int minVocabSymbol,
                       int maxVocabSymbol)

Specified by:

matches in class Transition

toString

public String toString()

Overrides:

toString in class Object