Antlr4.Automata.LexerATNFactory.CreateLexerAction C# (CSharp) Method

        private ILexerAction CreateLexerAction([NotNull] GrammarAST ID, [Nullable] GrammarAST arg)
        {
            string command = ID.Text;
            CheckCommands(command, ID.Token);

            if ("skip".Equals(command) && arg == null)
            {
                return LexerSkipAction.Instance;
            }
            else if ("more".Equals(command) && arg == null)
            {
                return LexerMoreAction.Instance;
            }
            else if ("popMode".Equals(command) && arg == null)
            {
                return LexerPopModeAction.Instance;
            }
            else if ("mode".Equals(command) && arg != null)
            {
                string modeName = arg.Text;
                int? mode = GetModeConstantValue(modeName, arg.Token);
                if (mode == null)
                {
                    return null;
                }

                return new LexerModeAction(mode.Value);
            }
            else if ("pushMode".Equals(command) && arg != null)
            {
                string modeName = arg.Text;
                int? mode = GetModeConstantValue(modeName, arg.Token);
                if (mode == null)
                {
                    return null;
                }

                return new LexerPushModeAction(mode.Value);
            }
            else if ("type".Equals(command) && arg != null)
            {
                string typeName = arg.Text;
                int? type = GetTokenConstantValue(typeName, arg.Token);
                if (type == null)
                {
                    return null;
                }

                return new LexerTypeAction(type.Value);
            }
            else if ("channel".Equals(command) && arg != null)
            {
                string channelName = arg.Text;
                int? channel = GetChannelConstantValue(channelName, arg.Token);
                if (channel == null)
                {
                    return null;
                }

                return new LexerChannelAction(channel.Value);
            }
            else
            {
                return null;
            }
        }