NCalcParser.arguments C# (CSharp) Method

    public NCalcParser.arguments_return arguments()
    {
        NCalcParser.arguments_return retval = new NCalcParser.arguments_return();
        retval.Start = input.LT(1);

        CommonTree root_0 = null;

        IToken char_literal44 = null;
        IToken char_literal46 = null;
        NCalcParser.expressionList_return expressionList45 = null;

        CommonTree char_literal44_tree=null;
        CommonTree char_literal46_tree=null;

        retval.value =  new List<LogicalExpression>();

        try
        {
            // C:\\Users\\s.ros\\Documents\\Développement\\NCalc\\Grammar\\NCalc.g:233:2: ( '(' ( expressionList )? ')' )
            // C:\\Users\\s.ros\\Documents\\Développement\\NCalc\\Grammar\\NCalc.g:233:4: '(' ( expressionList )? ')'
            {
                root_0 = (CommonTree)adaptor.GetNilNode();

                char_literal44=(IToken)Match(input,46,FOLLOW_46_in_arguments1006);
                    char_literal44_tree = (CommonTree)adaptor.Create(char_literal44);
                    adaptor.AddChild(root_0, char_literal44_tree);

                // C:\\Users\\s.ros\\Documents\\Développement\\NCalc\\Grammar\\NCalc.g:233:8: ( expressionList )?
                int alt23 = 2;
                int LA23_0 = input.LA(1);

                if ( ((LA23_0 >= INTEGER && LA23_0 <= NAME) || LA23_0 == 39 || (LA23_0 >= 43 && LA23_0 <= 46)) )
                {
                    alt23 = 1;
                }
                switch (alt23)
                {
                    case 1 :
                        // C:\\Users\\s.ros\\Documents\\Développement\\NCalc\\Grammar\\NCalc.g:233:10: expressionList
                        {
                            PushFollow(FOLLOW_expressionList_in_arguments1010);
                            expressionList45 = expressionList();
                            state.followingStackPointer--;

                            adaptor.AddChild(root_0, expressionList45.Tree);
                            retval.value =  ((expressionList45 != null) ? expressionList45.value : null);

                        }
                        break;

                }

                char_literal46=(IToken)Match(input,47,FOLLOW_47_in_arguments1017);
                    char_literal46_tree = (CommonTree)adaptor.Create(char_literal46);
                    adaptor.AddChild(root_0, char_literal46_tree);

            }

            retval.Stop = input.LT(-1);

                retval.Tree = (CommonTree)adaptor.RulePostProcessing(root_0);
                adaptor.SetTokenBoundaries(retval.Tree, (IToken) retval.Start, (IToken) retval.Stop);
        }
        catch (RecognitionException re)
        {
            ReportError(re);
            Recover(input,re);
        // Conversion of the second argument necessary, but harmless
        retval.Tree = (CommonTree)adaptor.ErrorNode(input, (IToken) retval.Start, input.LT(-1), re);

        }
        finally
        {
        }
        return retval;
    }