Last change
on this file since 12440 was
10562,
checked in by bburlacu, 10 years ago
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#2164: Committed initial version of the tree matching functionality.
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File size:
1019 bytes
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1 |
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2 | using System;
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3 | using System.Collections.Generic;
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4 | using System.Linq;
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5 | using HeuristicLab.Encodings.SymbolicExpressionTreeEncoding;
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6 |
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7 | namespace HeuristicLab.Problems.DataAnalysis.Symbolic {
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8 | public class SymbolicExpressionTreeCanonicalSorter {
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9 | private readonly HashSet<Type> nonSymmetricSymbols = new HashSet<Type> { typeof(Subtraction), typeof(Division) };
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10 |
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11 | public void SortSubtrees(ISymbolicExpressionTree tree) {
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12 | SortSubtrees(tree.Root);
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13 | }
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14 |
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15 | public void SortSubtrees(ISymbolicExpressionTreeNode node) {
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16 | if (node.SubtreeCount == 0) return;
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17 | var subtrees = node.Subtrees as List<ISymbolicExpressionTreeNode> ?? node.Subtrees.ToList();
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18 | if (IsSymmetric(node.Symbol)) {
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19 | var comparer = new SymbolicExpressionTreeNodeComparer();
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20 | subtrees.Sort(comparer);
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21 | }
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22 | foreach (var s in subtrees)
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23 | SortSubtrees(s);
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24 | }
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25 |
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26 | private bool IsSymmetric(ISymbol s) {
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27 | return !nonSymmetricSymbols.Contains(s.GetType());
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28 | }
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29 | }
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30 | }
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