EPPlus/FormulaParsing/ExpressionGraph/CompileStrategy/StringConcatStrategy.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)
 *******************************************************************************/

namespace OfficeOpenXml.FormulaParsing.ExpressionGraph.CompileStrategy;

public class StringConcatStrategy : CompileStrategy {
  public StringConcatStrategy(Expression expression)
      : base(expression) {}

  public override Expression Compile() {
    var newExp =
        _expression is ExcelAddressExpression
            ? _expression
            : ExpressionConverter.Instance.ToStringExpression(_expression);
    newExp.Prev = _expression.Prev;
    newExp.Next = _expression.Next;
    if (_expression.Prev != null) {
      _expression.Prev.Next = newExp;
    }
    if (_expression.Next != null) {
      _expression.Next.Prev = newExp;
    }
    return newExp.MergeWithNext();
  }
}