Antlr4.Runtime.Atn.ParserATNSimulator.ClosureCheckingStopState C# (CSharp) Метод

        protected void ClosureCheckingStopState(ATNConfig config,
												ATNConfigSet configSet,
												HashSet<ATNConfig> closureBusy,
												bool collectPredicates,
												bool fullCtx,
												int depth,
												bool treatEofAsEpsilon)
        {
            if (debug)
                Console.WriteLine("closure(" + config.ToString(parser, true) + ")");

            if (config.state is RuleStopState)
            {
                // We hit rule end. If we have context info, use it
                // run thru all possible stack tops in ctx
                if (!config.context.IsEmpty)
                {
                    for (int i = 0; i < config.context.Size; i++)
                    {
                        if (config.context.GetReturnState(i) == PredictionContext.EMPTY_RETURN_STATE)
                        {
                            if (fullCtx)
                            {
                                configSet.Add(new ATNConfig(config, config.state, PredictionContext.EMPTY), mergeCache);
                                continue;
                            }
                            else {
                                // we have no context info, just chase follow links (if greedy)
                                if (debug) Console.WriteLine("FALLING off rule " +
                                                              GetRuleName(config.state.ruleIndex));
                                Closure_(config, configSet, closureBusy, collectPredicates,
                                         fullCtx, depth, treatEofAsEpsilon);
                            }
                            continue;
                        }
                        ATNState returnState = atn.states[config.context.GetReturnState(i)];
                        PredictionContext newContext = config.context.GetParent(i); // "pop" return state
                        ATNConfig c = new ATNConfig(returnState, config.alt, newContext, config.semanticContext);
                        // While we have context to pop back from, we may have
                        // gotten that context AFTER having falling off a rule.
                        // Make sure we track that we are now out of context.
                        //
                        // This assignment also propagates the
                        // isPrecedenceFilterSuppressed() value to the new
                        // configuration.
                        c.reachesIntoOuterContext = config.OuterContextDepth;
                        ClosureCheckingStopState(c, configSet, closureBusy, collectPredicates,
                                                 fullCtx, depth - 1, treatEofAsEpsilon);
                    }
                    return;
                }
                else if (fullCtx)
                {
                    // reached end of start rule
                    configSet.Add(config, mergeCache);
                    return;
                }
                else {
                    // else if we have no context info, just chase follow links (if greedy)
                    if (debug) Console.WriteLine("FALLING off rule " +
                                                  GetRuleName(config.state.ruleIndex));
                }
            }

            Closure_(config, configSet, closureBusy, collectPredicates,
                     fullCtx, depth, treatEofAsEpsilon);
        }