1  #region License Information


2  /* HeuristicLab


3  * Copyright (C) 20022012 Heuristic and Evolutionary Algorithms Laboratory (HEAL)


4  *


5  * This file is part of HeuristicLab.


6  *


7  * HeuristicLab is free software: you can redistribute it and/or modify


8  * it under the terms of the GNU General Public License as published by


9  * the Free Software Foundation, either version 3 of the License, or


10  * (at your option) any later version.


11  *


12  * HeuristicLab is distributed in the hope that it will be useful,


13  * but WITHOUT ANY WARRANTY; without even the implied warranty of


14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the


15  * GNU General Public License for more details.


16  *


17  * You should have received a copy of the GNU General Public License


18  * along with HeuristicLab. If not, see <http://www.gnu.org/licenses/>.


19  */


20  #endregion


21 


22  using System.Collections.Generic;


23  using HeuristicLab.Common;


24  using HeuristicLab.Core;


25  using HeuristicLab.Data;


26  using HeuristicLab.Operators;


27  using HeuristicLab.Parameters;


28  using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;


29 


30  namespace HeuristicLab.Algorithms.RAPGA {


31  /// <summary>


32  /// An operator that evaluates an expression.


33  /// </summary>


34  [Item("Calculator", "An operator that evaluates an expression.")]


35  [StorableClass]


36  public class Calculator : ValuesCollector {


37  [Storable]


38  public Optimization.Calculator Calc { get; set; }


39 


40  #region Parameter Properties


41  public IValueLookupParameter<StringValue> ExpressionParameter {


42  get { return (IValueLookupParameter<StringValue>)Parameters["Expression"]; }


43  }


44  public IValueLookupParameter<IItem> ExpressionResultParameter {


45  get { return (IValueLookupParameter<IItem>)Parameters["ExpressionResult"]; }


46  }


47  #endregion


48 


49  #region Properties


50  private string Formula {


51  get { return ExpressionParameter.Value.Value; }


52  }


53  private IItem ExpressionResult {


54  set { ExpressionResultParameter.ActualValue = value; }


55  }


56  #endregion


57 


58  [StorableConstructor]


59  protected Calculator(bool deserializing) : base(deserializing) { }


60  protected Calculator(Calculator original, Cloner cloner)


61  : base(original, cloner) {


62  this.Calc = cloner.Clone(original.Calc);


63  }


64  public Calculator()


65  : base() {


66  Parameters.Add(new ValueLookupParameter<IItem>("ExpressionResult", "The result of the evaluated expression."));


67  Parameters.Add(new ValueLookupParameter<StringValue>("Expression",


68  @"RPN formula for new value in postfix notation.


69 


70  This can contain the following elements:


71 


72  literals:


73  numbers, true, false, null and strings in single quotes


74  variables (run parameters or results):


75  unquoted or in double quotes if they contain special characters or whitespace


76  mathematical functions:


77  +, , /, ^ (power), log


78  predicates:


79  ==, <, >, isnull, not


80  stack manipulation:


81  drop swap dup


82  string matching:


83  <string> <pattern> ismatch


84  string replacing:


85  <string> <pattern> <replacement> rename


86  conditionals:


87  <then> <else> <condition> if


88 


89  If the final value is null, the result variable is removed if it exists."));


90 


91  Calc = new Optimization.Calculator();


92  }


93 


94  public override IDeepCloneable Clone(Cloner cloner) {


95  return new Calculator(this, cloner);


96  }


97 


98  public override IOperation Apply() {


99  Calc.Formula = Formula;


100  var variables = new Dictionary<string, IItem>();


101  foreach (var collectedValue in CollectedValues)


102  variables[collectedValue.Name] = collectedValue.ActualValue;


103  ExpressionResult = Calc.GetValue(variables);


104  return base.Apply();


105  }


106  }


107  } 
