AppsheetEpplus/FormulaParsing/ExcelUtilities/ValueMatcher.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;

namespace AppsheetEpplus;

public class ValueMatcher {
  public const int IncompatibleOperands = -2;

  public virtual int IsMatch(object o1, object o2) {
    if (o1 != null && o2 == null) {
      return 1;
    }
    if (o1 == null && o2 != null) {
      return -1;
    }
    if (o1 == null && o2 == null) {
      return 0;
    }
    //Handle ranges and defined names
    o1 = CheckGetRange(o1);
    o2 = CheckGetRange(o2);

    if (o1 is string && o2 is string) {
      return CompareStringToString(o1.ToString().ToLower(), o2.ToString().ToLower());
    }
    if (o1.GetType() == typeof(string)) {
      return CompareStringToObject(o1.ToString(), o2);
    }
    if (o2.GetType() == typeof(string)) {
      return CompareObjectToString(o1, o2.ToString());
    }
    return Convert.ToDouble(o1).CompareTo(Convert.ToDouble(o2));
  }

  private static object CheckGetRange(object v) {
    if (v is ExcelDataProvider.IRangeInfo info) {
      if (info.GetNCells() > 1) {
        v = ExcelErrorValue.Create(eErrorType.Na);
      }
      v = info.GetOffset(0, 0);
    } else if (v is ExcelDataProvider.INameInfo nameInfo) {
      v = CheckGetRange(nameInfo);
    }
    return v;
  }

  protected virtual int CompareStringToString(string s1, string s2) {
    return s1.CompareTo(s2);
  }

  protected virtual int CompareStringToObject(string o1, object o2) {
    if (double.TryParse(o1, out var d1)) {
      return d1.CompareTo(Convert.ToDouble(o2));
    }
    return IncompatibleOperands;
  }

  protected virtual int CompareObjectToString(object o1, string o2) {
    if (double.TryParse(o2, out var d2)) {
      return Convert.ToDouble(o1).CompareTo(d2);
    }
    return IncompatibleOperands;
  }
}