1 | #region License Information
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2 | /* HeuristicLab
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3 | * Copyright (C) 2002-2010 Heuristic and Evolutionary Algorithms Laboratory (HEAL)
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4 | *
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5 | * This file is part of HeuristicLab.
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6 | *
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7 | * HeuristicLab is free software: you can redistribute it and/or modify
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8 | * it under the terms of the GNU General Public License as published by
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9 | * the Free Software Foundation, either version 3 of the License, or
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10 | * (at your option) any later version.
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11 | *
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12 | * HeuristicLab is distributed in the hope that it will be useful,
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13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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15 | * GNU General Public License for more details.
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16 | *
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17 | * You should have received a copy of the GNU General Public License
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18 | * along with HeuristicLab. If not, see <http://www.gnu.org/licenses/>.
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19 | */
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20 | #endregion
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21 |
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22 | using System;
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23 | using System.Collections.Generic;
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24 | using System.Linq;
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25 | using System.Text;
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26 | using HeuristicLab.Common;
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27 | using HeuristicLab.Core;
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28 | using System.Xml;
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29 | using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
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30 | using HeuristicLab.Encodings.SymbolicExpressionTreeEncoding.Symbols;
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31 |
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32 | namespace HeuristicLab.Encodings.SymbolicExpressionTreeEncoding {
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33 | [StorableClass]
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34 | [Item("GlobalSymbolicExpressionGrammar", "Represents a grammar that defines the syntax of symbolic expression trees.")]
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35 | public class GlobalSymbolicExpressionGrammar : DefaultSymbolicExpressionGrammar {
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36 | [Storable]
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37 | private int minFunctionDefinitions;
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38 | public int MinFunctionDefinitions {
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39 | get { return minFunctionDefinitions; }
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40 | set {
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41 | minFunctionDefinitions = value;
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42 | Initialize();
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43 | }
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44 | }
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45 | [Storable]
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46 | private int maxFunctionDefinitions;
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47 | public int MaxFunctionDefinitions {
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48 | get { return maxFunctionDefinitions; }
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49 | set {
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50 | maxFunctionDefinitions = value;
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51 | Initialize();
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52 | }
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53 | }
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54 | [Storable]
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55 | private int minFunctionArguments;
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56 | public int MinFunctionArguments {
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57 | get { return minFunctionArguments; }
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58 | set {
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59 | minFunctionArguments = value;
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60 | Initialize();
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61 | }
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62 | }
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63 | [Storable]
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64 | private int maxFunctionArguments;
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65 | public int MaxFunctionArguments {
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66 | get { return maxFunctionArguments; }
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67 | set {
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68 | maxFunctionArguments = value;
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69 | Initialize();
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70 | }
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71 | }
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72 | [Storable]
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73 | private ISymbolicExpressionGrammar mainBranchGrammar;
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74 |
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75 | public GlobalSymbolicExpressionGrammar() : base() { } // empty constructor for cloning
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76 |
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77 | public GlobalSymbolicExpressionGrammar(ISymbolicExpressionGrammar mainBranchGrammar )
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78 | : base() {
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79 | maxFunctionArguments = 3;
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80 | maxFunctionDefinitions = 3;
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81 | this.mainBranchGrammar = mainBranchGrammar;
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82 | Initialize();
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83 | }
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84 |
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85 | private void Initialize() {
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86 | base.Clear();
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87 |
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88 | // remove the start symbol of the default grammar
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89 | RemoveSymbol(StartSymbol);
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90 |
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91 | StartSymbol = new ProgramRootSymbol();
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92 | var defunSymbol = new Defun();
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93 | AddSymbol(StartSymbol);
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94 | AddSymbol(defunSymbol);
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95 |
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96 | SetMinSubtreeCount(StartSymbol, minFunctionDefinitions + 1);
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97 | SetMaxSubtreeCount(StartSymbol, maxFunctionDefinitions + 1);
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98 | SetMinSubtreeCount(defunSymbol, 1);
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99 | SetMaxSubtreeCount(defunSymbol, 1);
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100 |
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101 | if (mainBranchGrammar != null) {
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102 | // copy symbols from mainBranchGrammar
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103 | foreach (var symb in mainBranchGrammar.Symbols) {
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104 | AddSymbol(symb);
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105 | SetMinSubtreeCount(symb, mainBranchGrammar.GetMinSubtreeCount(symb));
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106 | SetMaxSubtreeCount(symb, mainBranchGrammar.GetMaxSubtreeCount(symb));
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107 | }
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108 |
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109 | // the start symbol of the mainBranchGrammar is allowed as the result producing branch
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110 | SetAllowedChild(StartSymbol, mainBranchGrammar.StartSymbol, 0);
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111 |
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112 | // ADF branches maxFunctionDefinitions
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113 | for (int argumentIndex = 1; argumentIndex < maxFunctionDefinitions + 1; argumentIndex++) {
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114 | SetAllowedChild(StartSymbol, defunSymbol, argumentIndex);
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115 | }
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116 |
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117 | // copy syntax constraints from mainBranchGrammar
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118 | foreach (var parent in mainBranchGrammar.Symbols) {
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119 | for (int i = 0; i < mainBranchGrammar.GetMaxSubtreeCount(parent); i++) {
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120 | foreach (var child in mainBranchGrammar.Symbols) {
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121 | if (mainBranchGrammar.IsAllowedChild(parent, child, i)) {
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122 | SetAllowedChild(parent, child, i);
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123 | }
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124 | }
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125 | }
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126 | }
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127 |
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128 | // every symbol of the mainBranchGrammar that is allowed as child of the start symbol is also allowed as direct child of defun
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129 | foreach (var symb in mainBranchGrammar.Symbols) {
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130 | if (mainBranchGrammar.IsAllowedChild(mainBranchGrammar.StartSymbol, symb, 0))
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131 | SetAllowedChild(defunSymbol, symb, 0);
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132 | }
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133 | }
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134 | }
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135 | public override IDeepCloneable Clone(Cloner cloner) {
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136 | GlobalSymbolicExpressionGrammar clone = (GlobalSymbolicExpressionGrammar)base.Clone(cloner);
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137 | clone.maxFunctionArguments = maxFunctionArguments;
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138 | clone.maxFunctionDefinitions = maxFunctionDefinitions;
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139 | clone.minFunctionArguments = minFunctionArguments;
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140 | clone.minFunctionDefinitions = minFunctionDefinitions;
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141 | clone.mainBranchGrammar = (ISymbolicExpressionGrammar)cloner.Clone(mainBranchGrammar);
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142 | return clone;
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143 | }
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144 | }
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145 | }
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