AppsheetEpplus/FormulaParsing/Excel/Functions/IntArgumentParser.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		                2013-12-03
 *******************************************************************************/

using System;
using System.Linq;

namespace AppsheetEpplus;

public class IntArgumentParser : ArgumentParser {
  public override object Parse(object obj) {
    Require.That(obj).Named("argument").IsNotNull();
    if (obj is ExcelDataProvider.IRangeInfo info) {
      var r = info.FirstOrDefault();
      return r == null ? 0 : Convert.ToInt32(r.ValueDouble);
    }
    var objType = obj.GetType();
    if (objType == typeof(int)) {
      return (int)obj;
    }
    if (objType == typeof(double) || objType == typeof(decimal)) {
      return Convert.ToInt32(obj);
    }
    if (!int.TryParse(obj.ToString(), out var result)) {
      throw new ExcelErrorValueException(ExcelErrorValue.Create(eErrorType.Value));
    }
    return result;
  }
}