EPPlus/FormulaParsing/ExcelUtilities/IndexToAddressTranslator.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 OfficeOpenXml.FormulaParsing.Utilities;

namespace OfficeOpenXml.FormulaParsing.ExcelUtilities;

public class IndexToAddressTranslator {
  public IndexToAddressTranslator(ExcelDataProvider excelDataProvider)
      : this(excelDataProvider, ExcelReferenceType.AbsoluteRowAndColumn) {}

  public IndexToAddressTranslator(
      ExcelDataProvider excelDataProvider,
      ExcelReferenceType referenceType) {
    Require.That(excelDataProvider).Named("excelDataProvider").IsNotNull();
    _excelDataProvider = excelDataProvider;
    _excelReferenceType = referenceType;
  }

  private readonly ExcelDataProvider _excelDataProvider;
  private readonly ExcelReferenceType _excelReferenceType;

  protected internal static string GetColumnLetter(int iColumnNumber, bool fixedCol) {
    if (iColumnNumber < 1) {
      //throw new Exception("Column number is out of range");
      return "#REF!";
    }

    string sCol = "";
    do {
      sCol = ((char)('A' + ((iColumnNumber - 1) % 26))) + sCol;
      iColumnNumber = (iColumnNumber - ((iColumnNumber - 1) % 26)) / 26;
    } while (iColumnNumber > 0);
    return fixedCol ? "$" + sCol : sCol;
  }

  public string ToAddress(int col, int row) {
    var fixedCol =
        _excelReferenceType == ExcelReferenceType.AbsoluteRowAndColumn
            || _excelReferenceType == ExcelReferenceType.RelativeRowAbsolutColumn;
    var colString = GetColumnLetter(col, fixedCol);
    return colString + GetRowNumber(row);
  }

  private string GetRowNumber(int rowNo) {
    var retVal = rowNo < (_excelDataProvider.ExcelMaxRows) ? rowNo.ToString() : string.Empty;
    if (!string.IsNullOrEmpty(retVal)) {
      switch (_excelReferenceType) {
        case ExcelReferenceType.AbsoluteRowAndColumn:
        case ExcelReferenceType.AbsoluteRowRelativeColumn:
          return "$" + retVal;
        default:
          return retVal;
      }
    }
    return retVal;
  }
}