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.Globalization;
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28 | using System.Linq;
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29 | using System.Text;
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30 | using OfficeOpenXml.FormulaParsing.ExpressionGraph;
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31 |
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32 | namespace OfficeOpenXml.FormulaParsing.Excel.Functions.Text
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33 | {
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34 | public class Proper : 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 text = ArgToString(arguments, 0).ToLower(CultureInfo.InvariantCulture);
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40 | var sb = new StringBuilder();
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41 | var previousChar = '.';
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42 | foreach (var ch in text)
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43 | {
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44 | if (!char.IsLetter(previousChar))
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45 | {
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46 | sb.Append(ch.ToString(CultureInfo.InvariantCulture).ToUpperInvariant());
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47 | }
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48 | else
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49 | {
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50 | sb.Append(ch);
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51 | }
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52 | previousChar = ch;
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53 | }
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54 | return CreateResult(sb.ToString(), DataType.String);
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55 | }
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56 | }
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57 | }
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