Examples of org.antlr.v4.runtime.atn.ATN.nextTokens()

org.antlr.v4.runtime.atn.ATN.nextTokens()
Compute the set of valid tokens that can occur starting in state {@code s}. If {@code ctx} is null, the set of tokens will not include what can followthe rule surrounding {@code s}. In other words, the set will be restricted to tokens reachable staying within {@code s}'s rule.

    // ATN state, then we know we're missing a token; error recovery
    // is free to conjure up and insert the missing token
    ATNState currentState = recognizer.getInterpreter().atn.states.get(recognizer.getState());
    ATNState next = currentState.transition(0).target;
    ATN atn = recognizer.getInterpreter().atn;
    IntervalSet expectingAtLL2 = atn.nextTokens(next, recognizer._ctx);
//    System.out.println("LT(2) set="+expectingAtLL2.toString(recognizer.getTokenNames()));
    if ( expectingAtLL2.contains(currentSymbolType) ) {
      reportMissingToken(recognizer);
      return true;
    }

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    IntervalSet recoverSet = new IntervalSet();
    while ( ctx!=null && ctx.invokingState>=0 ) {
      // compute what follows who invoked us
      ATNState invokingState = atn.states.get(ctx.invokingState);
      RuleTransition rt = (RuleTransition)invokingState.transition(0);
      IntervalSet follow = atn.nextTokens(rt.followState);
      recoverSet.addAll(follow);
      ctx = ctx.parent;
    }
        recoverSet.remove(Token.EPSILON);
//    System.out.println("recover set "+recoverSet.toString(recognizer.getTokenNames()));

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    public boolean isExpectedToken(int symbol) {
//       return getInterpreter().atn.nextTokens(_ctx);
        ATN atn = getInterpreter().atn;
    ParserRuleContext ctx = _ctx;
        ATNState s = atn.states.get(getState());
        IntervalSet following = atn.nextTokens(s);
        if (following.contains(symbol)) {
            return true;
        }
//        System.out.println("following "+s+"="+following);
        if ( !following.contains(Token.EPSILON) ) return false;

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        if ( !following.contains(Token.EPSILON) ) return false;


        while ( ctx!=null && ctx.invokingState>=0 && following.contains(Token.EPSILON) ) {
            ATNState invokingState = atn.states.get(ctx.invokingState);
            RuleTransition rt = (RuleTransition)invokingState.transition(0);
            following = atn.nextTokens(rt.followState);
            if (following.contains(symbol)) {
                return true;
            }


            ctx = (ParserRuleContext)ctx.parent;

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  @NotNull
    public IntervalSet getExpectedTokensWithinCurrentRule() {
        ATN atn = getInterpreter().atn;
        ATNState s = atn.states.get(getState());
       return atn.nextTokens(s);
     }


  /** Get a rule's index (i.e., {@code RULE_ruleName} field) or -1 if not found. */
  public int getRuleIndex(String ruleName) {
    Integer ruleIndex = getRuleIndexMap().get(ruleName);

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