EPPlus/FormulaParsing/Excel/Functions/RefAndLookup/Indirect.cs

/* 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		                2014-04-13
 *******************************************************************************/
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using OfficeOpenXml.FormulaParsing.ExpressionGraph;

namespace OfficeOpenXml.FormulaParsing.Excel.Functions.RefAndLookup
{
    public class Indirect : ExcelFunction
    {
        public override CompileResult Execute(IEnumerable<FunctionArgument> arguments, ParsingContext context)
        {
            ValidateArguments(arguments, 1);
            var address = ArgToString(arguments, 0);
            var adr = new ExcelAddress(address);
            var ws = adr.WorkSheet;
            if (string.IsNullOrEmpty(ws))
            {
                ws = context.Scopes.Current.Address.Worksheet;
            }
            var result = context.ExcelDataProvider.GetRange(ws, adr._fromRow, adr._fromCol, address);
            if (result.IsEmpty)
            {
                // Bug 15290
                var namedValueExpr = new NamedValueExpression(address, context);
                return namedValueExpr.Compile();
            }
            return new CompileResult(result, DataType.Enumerable);
        }
    }
}