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 |
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23 | using HeuristicLab.Encodings.SymbolicExpressionTreeEncoding;
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24 | using System.Collections.Generic;
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25 | using System;
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26 | using System.Linq;
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27 | using HeuristicLab.Core;
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28 | using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
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29 | using HeuristicLab.Encodings.SymbolicExpressionTreeEncoding.GeneralSymbols;
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30 | using HeuristicLab.Problems.DataAnalysis.Regression.Symbolic.Symbols;
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31 | using HeuristicLab.Data;
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32 | namespace HeuristicLab.Problems.DataAnalysis.Regression.Symbolic {
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33 | [StorableClass]
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34 | public class ArithmeticExpressionGrammar : NamedItemCollection<Symbol>, ISymbolicExpressionGrammar {
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35 |
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36 | private List<string> variableNames = new List<string>();
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37 | public IEnumerable<string> VariableNames {
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38 | get { return variableNames; }
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39 | set {
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40 | variableNames = new List<string>(value);
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41 | var variable = (HeuristicLab.Problems.DataAnalysis.Regression.Symbolic.Symbols.Variable)allSymbols[5];
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42 | variable.VariableNames = new ItemList<HeuristicLab.Data.StringValue>(variableNames.Select(x => new StringValue(x)));
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43 | }
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44 | }
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45 |
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46 | public ArithmeticExpressionGrammar()
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47 | : this(allSymbols) {
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48 | }
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49 |
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50 | public ArithmeticExpressionGrammar(IEnumerable<Symbol> symbols)
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51 | : base(symbols) {
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52 | allSymbols = new List<Symbol>(symbols);
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53 | }
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54 |
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55 | #region ISymbolicExpressionGrammar Members
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56 | [Storable]
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57 | private StartSymbol startSymbol = new StartSymbol();
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58 | public Symbol StartSymbol {
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59 | get { return startSymbol; }
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60 | }
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61 |
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62 | [Storable]
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63 | private static List<Symbol> allSymbols = new List<Symbol>() {
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64 | new Addition(),
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65 | new Subtraction(),
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66 | new Multiplication(),
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67 | new Division(),
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68 | new Constant(),
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69 | new HeuristicLab.Problems.DataAnalysis.Regression.Symbolic.Symbols.Variable()
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70 | };
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71 | [Storable]
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72 | private Dictionary<Type, Dictionary<int, IEnumerable<Symbol>>> allowedSymbols = new Dictionary<Type, Dictionary<int, IEnumerable<Symbol>>>() {
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73 | {
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74 | typeof(StartSymbol),
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75 | new Dictionary<int, IEnumerable<Symbol>>()
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76 | {
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77 | { 0, allSymbols},
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78 | }
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79 | }, {
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80 | typeof(Addition),
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81 | new Dictionary<int, IEnumerable<Symbol>>()
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82 | {
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83 | { 0, allSymbols},
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84 | { 1, allSymbols}
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85 | }
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86 | },
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87 | {
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88 | typeof(Subtraction),
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89 | new Dictionary<int, IEnumerable<Symbol>>()
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90 | {
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91 | { 0, allSymbols},
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92 | { 1, allSymbols}
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93 | }
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94 | },
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95 | {
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96 | typeof(Multiplication),
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97 | new Dictionary<int, IEnumerable<Symbol>>()
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98 | {
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99 | { 0, allSymbols},
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100 | { 1, allSymbols}
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101 | }
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102 | },
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103 | {
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104 | typeof(Division),
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105 | new Dictionary<int, IEnumerable<Symbol>>()
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106 | {
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107 | { 0, allSymbols},
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108 | { 1, allSymbols}
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109 | }
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110 | },
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111 | };
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112 | public IEnumerable<Symbol> AllowedSymbols(Symbol parent, int argumentIndex) {
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113 | return allowedSymbols[parent.GetType()][argumentIndex];
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114 | }
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115 |
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116 | [Storable]
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117 | private Dictionary<Type, int> minLength = new Dictionary<Type, int>() {
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118 | {typeof(StartSymbol), 1},
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119 | {typeof(Addition), 3},
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120 | {typeof(Subtraction), 3},
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121 | {typeof(Multiplication), 4},
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122 | {typeof(Division), 4},
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123 | {typeof(Constant), 1},
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124 | {typeof(HeuristicLab.Problems.DataAnalysis.Regression.Symbolic.Symbols.Variable), 1},
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125 | };
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126 | public int MinimalExpressionLength(Symbol start) {
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127 | return minLength[start.GetType()];
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128 | }
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129 |
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130 | [Storable]
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131 | private Dictionary<Type, int> maxLength = new Dictionary<Type, int>() {
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132 | {typeof(StartSymbol), int.MaxValue},
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133 | {typeof(Addition), int.MaxValue},
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134 | {typeof(Subtraction), int.MaxValue},
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135 | {typeof(Multiplication), int.MaxValue},
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136 | {typeof(Division), int.MaxValue},
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137 | {typeof(HeuristicLab.Problems.DataAnalysis.Regression.Symbolic.Symbols.Variable), 1},
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138 | {typeof(Constant), 1},
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139 | };
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140 | public int MaximalExpressionLength(Symbol start) {
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141 | return maxLength[start.GetType()];
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142 | }
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143 |
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144 | [Storable]
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145 | private Dictionary<Type, int> minDepth = new Dictionary<Type, int>() {
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146 | {typeof(StartSymbol), 1},
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147 | {typeof(Addition), 1},
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148 | {typeof(Subtraction), 1},
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149 | {typeof(Multiplication), 1},
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150 | {typeof(Division), 1},
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151 | {typeof(Constant), 0},
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152 | {typeof(HeuristicLab.Problems.DataAnalysis.Regression.Symbolic.Symbols.Variable), 0}
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153 | };
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154 | public int MinimalExpressionDepth(Symbol start) {
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155 | return minDepth[start.GetType()];
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156 | }
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157 |
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158 | [Storable]
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159 | private Dictionary<Type, int> subTrees = new Dictionary<Type, int>() {
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160 | {typeof(StartSymbol), 1},
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161 | {typeof(Addition), 2},
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162 | {typeof(Subtraction), 2},
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163 | {typeof(Multiplication), 2},
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164 | {typeof(Division), 2},
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165 | {typeof(HeuristicLab.Problems.DataAnalysis.Regression.Symbolic.Symbols.Variable), 0},
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166 | {typeof(Constant), 0},
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167 | };
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168 | public int MinSubTrees(Symbol start) {
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169 | return subTrees[start.GetType()];
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170 | }
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171 | public int MaxSubTrees(Symbol start) {
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172 | return subTrees[start.GetType()];
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173 | }
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174 |
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175 | #endregion
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176 |
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177 | #region ISymbolicExpressionGrammar Members
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178 |
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179 |
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180 | public bool IsValidExpression(SymbolicExpressionTree expression) {
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181 | if (expression.Root.Symbol != StartSymbol) return false;
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182 | return IsValidExpression(expression.Root);
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183 | }
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184 |
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185 | #endregion
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186 |
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187 | private bool IsValidExpression(SymbolicExpressionTreeNode root) {
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188 | if (root.SubTrees.Count < MinSubTrees(root.Symbol)) return false;
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189 | if (root.SubTrees.Count > MaxSubTrees(root.Symbol)) return false;
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190 | for (int i = 0; i < root.SubTrees.Count; i++) {
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191 | if (!AllowedSymbols(root.Symbol, i).Contains(root.SubTrees[i].Symbol)) return false;
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192 | if (!IsValidExpression(root.SubTrees[i])) return false;
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193 | }
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194 | return true;
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195 | }
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196 | }
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197 | }
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