EPPlus/FormulaParsing/Excel/Functions/ArgumentCollectionUtil.cs

/*******************************************************************************
 * You may amend and distribute as you like, but don't remove this header!
 *
 * EPPlus provides server-side generation of Excel 2007/2010 spreadsheets.
 * See http://www.codeplex.com/EPPlus for details.
 *
 * Copyright (C) 2011  Jan Källman
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.

 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  
 * See the GNU Lesser General Public License for more details.
 *
 * The GNU Lesser General Public License can be viewed at http://www.opensource.org/licenses/lgpl-license.php
 * If you unfamiliar with this license or have questions about it, here is an http://www.gnu.org/licenses/gpl-faq.html
 *
 * All code and executables are provided "as is" with no warranty either express or implied. 
 * The author accepts no liability for any damage or loss of business that this product may cause.
 *
 * Code change notes:
 * 
 * Author							Change						Date
 *******************************************************************************
 * Mats Alm   		                Added		                2013-12-03
 *******************************************************************************/
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace OfficeOpenXml.FormulaParsing.Excel.Functions
{
    public class ArgumentCollectionUtil
    {
        private readonly DoubleEnumerableArgConverter _doubleEnumerableArgConverter;
        private readonly ObjectEnumerableArgConverter _objectEnumerableArgConverter;

        public ArgumentCollectionUtil()
            : this(new DoubleEnumerableArgConverter(), new ObjectEnumerableArgConverter())
        {

        }

        public ArgumentCollectionUtil(
            DoubleEnumerableArgConverter doubleEnumerableArgConverter, 
            ObjectEnumerableArgConverter objectEnumerableArgConverter)
        {
            _doubleEnumerableArgConverter = doubleEnumerableArgConverter;
            _objectEnumerableArgConverter = objectEnumerableArgConverter;
        }

        public virtual IEnumerable<double> ArgsToDoubleEnumerable(bool ignoreHidden, bool ignoreErrors, IEnumerable<FunctionArgument> arguments, ParsingContext context)
        {
            return _doubleEnumerableArgConverter.ConvertArgs(ignoreHidden, ignoreErrors, arguments, context);
        }

        public virtual IEnumerable<object> ArgsToObjectEnumerable(bool ignoreHidden,
                                                                  IEnumerable<FunctionArgument> arguments,
                                                                  ParsingContext context)
        {
            return _objectEnumerableArgConverter.ConvertArgs(ignoreHidden, arguments, context);
        }

        public virtual double CalculateCollection(IEnumerable<FunctionArgument> collection, double result, Func<FunctionArgument, double, double> action)
        {
            foreach (var item in collection)
            {
                if (item.Value is IEnumerable<FunctionArgument>)
                {
                    result = CalculateCollection((IEnumerable<FunctionArgument>)item.Value, result, action);
                }
                else
                {
                    result = action(item, result);
                }
            }
            return result;
        }
    }
}