Antlr4.Analysis.AnalysisPipeline.ProcessLexer C# (CSharp) Method

        protected virtual void ProcessLexer()
        {
            // make sure all non-fragment lexer rules must match at least one symbol
            foreach (Rule rule in g.rules.Values)
            {
                if (rule.IsFragment())
                {
                    continue;
                }

                LL1Analyzer analyzer = new LL1Analyzer(g.atn);
                IntervalSet look = analyzer.Look(g.atn.ruleToStartState[rule.index], PredictionContext.EmptyLocal);
                if (look.Contains(TokenConstants.Epsilon))
                {
                    g.tool.errMgr.GrammarError(ErrorType.EPSILON_TOKEN, g.fileName, ((GrammarAST)rule.ast.GetChild(0)).Token, rule.name);
                }
            }
        }