EPPlus/FormulaParsing/ExpressionGraph/NamedValueExpression.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       		        2013-03-01 (Prior file history on https://github.com/swmal/ExcelFormulaParser)
 *******************************************************************************/
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace OfficeOpenXml.FormulaParsing.ExpressionGraph
{
    public class NamedValueExpression : AtomicExpression
    {
        public NamedValueExpression(string expression, ParsingContext parsingContext)
            : base(expression)
        {
            _parsingContext = parsingContext;
        }

        private readonly ParsingContext _parsingContext;

        public override CompileResult Compile()
        {
            var c = this._parsingContext.Scopes.Current;
            var name = _parsingContext.ExcelDataProvider.GetName(c.Address.Worksheet, ExpressionString);
            //var result = _parsingContext.Parser.Parse(value.ToString());

            if (name == null)
            {
                throw (new Exceptions.ExcelErrorValueException(ExcelErrorValue.Create(eErrorType.Name)));
            }
            if (name.Value==null)
            {
                return null;
            }
            if (name.Value is ExcelDataProvider.IRangeInfo)
            {
                var range = (ExcelDataProvider.IRangeInfo)name.Value;
                if (range.IsMulti)
                {
                    return new CompileResult(name.Value, DataType.Enumerable);
                }
                else
                {
                    if (range.IsEmpty)
                    {
                        return null;
                    }
                    var factory = new CompileResultFactory();
                    return factory.Create(range.First().Value);
                }
            }
            else
            {                
                var factory = new CompileResultFactory();
                return factory.Create(name.Value);
            }

            
            
            //return new CompileResultFactory().Create(result);
        }
    }
}