org.antlr.v4.runtime.atn

Class ATN

java.lang.Object

org.antlr.v4.runtime.atn.ATN

public class ATN
extends Object

Field Summary

Fields

Modifier and Type	Field and Description
List<DecisionState>	decisionToState Each subrule/rule is a decision point and we must track them so we can go back later and build DFA predictors for them.
int	grammarType
static int	INVALID_ALT_NUMBER
static int	LEXER
int	maxTokenType
Map<String,TokensStartState>	modeNameToStartState
List<TokensStartState>	modeToStartState
static int	PARSER
int[]	ruleToActionIndex
RuleStartState[]	ruleToStartState
RuleStopState[]	ruleToStopState
int[]	ruleToTokenType
List<ATNState>	states

Constructor Summary

Constructors

Constructor and Description
ATN() Used for runtime deserialization of ATNs from strings

Method Summary

Methods

Modifier and Type	Method and Description
void	addState(ATNState state)
int	defineDecisionState(DecisionState s)
DecisionState	getDecisionState(int decision)
int	getNumberOfDecisions()
IntervalSet	nextTokens(ATNState s) Compute the set of valid tokens that can occur starting in s and staying in same rule.
IntervalSet	nextTokens(ATNState s, RuleContext ctx) Compute the set of valid tokens that can occur starting in s.
void	removeState(ATNState state)

Methods inherited from class java.lang.Object

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

Field Detail

INVALID_ALT_NUMBER

public static final int INVALID_ALT_NUMBER

See Also:

Constant Field Values

PARSER

public static final int PARSER

See Also:

Constant Field Values

LEXER

public static final int LEXER

See Also:

Constant Field Values

states

@NotNull
public final List<ATNState> states

decisionToState

@NotNull
public final List<DecisionState> decisionToState

Each subrule/rule is a decision point and we must track them so we can go back later and build DFA predictors for them. This includes all the rules, subrules, optional blocks, ()+, ()* etc...

ruleToStartState

public RuleStartState[] ruleToStartState

ruleToStopState

public RuleStopState[] ruleToStopState

modeNameToStartState

@NotNull
public final Map<String,TokensStartState> modeNameToStartState

grammarType

public int grammarType

maxTokenType

public int maxTokenType

ruleToTokenType

public int[] ruleToTokenType

ruleToActionIndex

public int[] ruleToActionIndex

modeToStartState

@NotNull
public final List<TokensStartState> modeToStartState

Constructor Detail

ATN

public ATN()

Used for runtime deserialization of ATNs from strings

Method Detail

nextTokens

public IntervalSet nextTokens(ATNState s,
                     RuleContext ctx)

Compute the set of valid tokens that can occur starting in s. If ctx is null, the set of tokens will not include what can follow the rule surrounding s. In other words, the set will be restricted to tokens reachable staying within s's rule.

nextTokens

public IntervalSet nextTokens(ATNState s)

Compute the set of valid tokens that can occur starting in s and staying in same rule. EPSILON is in set if we reach end of rule.

addState

public void addState(@Nullable
            ATNState state)

removeState

public void removeState(@NotNull
               ATNState state)

defineDecisionState

public int defineDecisionState(@NotNull
                      DecisionState s)

getDecisionState

public DecisionState getDecisionState(int decision)

getNumberOfDecisions

public int getNumberOfDecisions()