1 | /* Copyright (C) 2011 Jan Källman
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2 | *
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3 | * This library is free software; you can redistribute it and/or
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4 | * modify it under the terms of the GNU Lesser General Public
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5 | * License as published by the Free Software Foundation; either
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6 | * version 2.1 of the License, or (at your option) any later version.
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7 |
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8 | * This library is distributed in the hope that it will be useful,
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9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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11 | * See the GNU Lesser General Public License for more details.
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12 | *
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13 | * The GNU Lesser General Public License can be viewed at http://www.opensource.org/licenses/lgpl-license.php
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14 | * If you unfamiliar with this license or have questions about it, here is an http://www.gnu.org/licenses/gpl-faq.html
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15 | *
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16 | * All code and executables are provided "as is" with no warranty either express or implied.
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17 | * The author accepts no liability for any damage or loss of business that this product may cause.
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18 | *
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19 | * Code change notes:
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20 | *
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21 | * Author Change Date
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22 | *******************************************************************************
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23 | * Mats Alm Added 2013-12-03
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24 | *******************************************************************************/
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25 | using System;
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26 | using System.Collections.Generic;
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27 | using System.Linq;
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28 | using System.Text;
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29 | using OfficeOpenXml.FormulaParsing.Exceptions;
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30 | using OfficeOpenXml.FormulaParsing.ExpressionGraph;
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31 |
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32 | namespace OfficeOpenXml.FormulaParsing.Excel.Functions.DateTime
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33 | {
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34 | public class Weekday : ExcelFunction
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35 | {
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36 | public override CompileResult Execute(IEnumerable<FunctionArgument> arguments, ParsingContext context)
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37 | {
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38 | ValidateArguments(arguments, 1);
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39 | var serialNumber = ArgToDecimal(arguments, 0);
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40 | var returnType = arguments.Count() > 1 ? ArgToInt(arguments, 1) : 1;
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41 | return CreateResult(CalculateDayOfWeek(System.DateTime.FromOADate(serialNumber), returnType), DataType.Integer);
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42 | }
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43 |
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44 | private static List<int> _oneBasedStartOnSunday = new List<int> { 1, 2, 3, 4, 5, 6, 7 };
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45 | private static List<int> _oneBasedStartOnMonday = new List<int> { 7, 1, 2, 3, 4, 5, 6 };
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46 | private static List<int> _zeroBasedStartOnSunday = new List<int> { 6, 0, 1, 2, 3, 4, 5 };
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47 |
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48 | private int CalculateDayOfWeek(System.DateTime dateTime, int returnType)
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49 | {
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50 | var dayIx = (int)dateTime.DayOfWeek;
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51 | switch (returnType)
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52 | {
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53 | case 1:
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54 | return _oneBasedStartOnSunday[dayIx];
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55 | case 2:
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56 | return _oneBasedStartOnMonday[dayIx];
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57 | case 3:
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58 | return _zeroBasedStartOnSunday[dayIx];
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59 | default:
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60 | throw new ExcelErrorValueException(eErrorType.Num);
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61 | }
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62 | }
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63 | }
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64 | }
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