source: stable/HeuristicLab.Encodings.SymbolicExpressionTreeEncoding/3.4/Formatters/SymbolicExpressionTreeGraphvizFormatter.cs @ 9864

Last change on this file since 9864 was 9864, checked in by gkronber, 9 years ago

#1270 merged r9863 from trunk to stable branch

File size: 3.7 KB
Line 
1#region License Information
2/* HeuristicLab
3 * Copyright (C) 2002-2013 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
22using System.Collections.Generic;
23using System.Text;
24using HeuristicLab.Common;
25using HeuristicLab.Core;
26
27namespace HeuristicLab.Encodings.SymbolicExpressionTreeEncoding {
28  [Item("GraphViz String Formatter", "Formatter for symbolic expression trees for visualization with GraphViz.")]
29  public sealed class SymbolicExpressionTreeGraphvizFormatter : NamedItem, ISymbolicExpressionTreeStringFormatter {
30    public bool Indent { get; set; }
31
32    private readonly static Dictionary<string, string> symbolNameMap = new Dictionary<string, string>() {
33      // match Koza style
34      {"ProgramRootSymbol", "Prog"},
35      {"StartSymbol", "RPB"},
36    };
37
38    public SymbolicExpressionTreeGraphvizFormatter()
39      : base("GraphViz String Formatter", "Formatter for symbolic expression trees for visualization with GraphViz.") {
40      Indent = true;
41    }
42    private SymbolicExpressionTreeGraphvizFormatter(SymbolicExpressionTreeGraphvizFormatter original, Cloner cloner)
43      : base(original, cloner) {
44      this.Indent = original.Indent;
45    }
46
47    public override IDeepCloneable Clone(Cloner cloner) {
48      return new SymbolicExpressionTreeGraphvizFormatter(this, cloner);
49    }
50
51    public string Format(ISymbolicExpressionTree symbolicExpressionTree) {
52      int nodeCounter = 1;
53      StringBuilder strBuilder = new StringBuilder();
54      strBuilder.AppendLine("graph {");
55      strBuilder.AppendLine(FormatRecursively(symbolicExpressionTree.Root, 0, ref nodeCounter));
56      strBuilder.AppendLine("}");
57      return strBuilder.ToString();
58    }
59
60    private string FormatRecursively(ISymbolicExpressionTreeNode node, int indentLength, ref int nodeId) {
61      // save id of current node
62      int currentNodeId = nodeId;
63      // increment id for next node
64      nodeId++;
65
66      StringBuilder strBuilder = new StringBuilder();
67      if (Indent) strBuilder.Append(' ', indentLength);
68
69      // get label for node and map if necessary
70      string nodeLabel = node.ToString();
71      if (symbolNameMap.ContainsKey(nodeLabel)) {
72        nodeLabel = symbolNameMap[nodeLabel];
73      }
74
75      strBuilder.Append("node" + currentNodeId + "[label=\"" + nodeLabel + "\"");
76      // leaf nodes should have box shape
77      if (node.SubtreeCount == 0) {
78        strBuilder.AppendLine(", shape=\"box\"];");
79      } else {
80        strBuilder.AppendLine("];");
81      }
82
83      // internal nodes or leaf nodes?
84      foreach (ISymbolicExpressionTreeNode subTree in node.Subtrees) {
85        // add an edge
86        if (Indent) strBuilder.Append(' ', indentLength);
87        strBuilder.AppendLine("node" + currentNodeId + " -- node" + nodeId + ";");
88        // format the whole subtree
89        strBuilder.Append(FormatRecursively(subTree, indentLength + 2, ref nodeId));
90      }
91
92      return strBuilder.ToString();
93    }
94  }
95}
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