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source: branches/DataAnalysis.Extensions/HeuristicLab.Encodings.SymbolicExpressionTreeEncoding/3.3/SymbolicExpressionTreeStringFormatter.cs @ 4840

Last change on this file since 4840 was 4840, checked in by swinkler, 13 years ago

Renamed solution in formatters branch; implemented view for display of symbolic expression trees as strings depending on the chosen formatter. (#1270)

File size: 3.0 KB
Line 
1#region License Information
2/* HeuristicLab
3 * Copyright (C) 2002-2010 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.Text;
23using HeuristicLab.Core;
24using HeuristicLab.Common;
25using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
26
27namespace HeuristicLab.Encodings.SymbolicExpressionTreeEncoding {
28
29  [Item("SymbolicExpressionTreeStringFormatter", "The default string formatter for symbolic expression trees.")]
30  [StorableClass]
31  public class SymbolicExpressionTreeStringFormatter : NamedItem, ISymbolicExpressionTreeStringFormatter {
32
33    public bool Indent { get; set; }
34
35    [StorableConstructor]
36    protected SymbolicExpressionTreeStringFormatter(bool deserializing) : base(deserializing) { }
37    protected SymbolicExpressionTreeStringFormatter(SymbolicExpressionTreeStringFormatter original, Cloner cloner)
38      : base(original, cloner) {
39      Indent = original.Indent;
40    }
41    public SymbolicExpressionTreeStringFormatter()
42      : base() {
43      Name = "Default String Formatter";
44      Indent = true;
45    }
46
47    public string Format(SymbolicExpressionTree symbolicExpressionTree) {
48      return FormatRecursively(symbolicExpressionTree.Root, 0);
49    }
50
51    private string FormatRecursively(SymbolicExpressionTreeNode node, int indentLength) {
52      StringBuilder strBuilder = new StringBuilder();
53      if (Indent) strBuilder.Append(' ', indentLength);
54      strBuilder.Append("(");
55      // internal nodes or leaf nodes?
56      if (node.SubTrees.Count > 0) {
57        // symbol on same line as '('
58        strBuilder.AppendLine(node.ToString());
59        // each subtree expression on a new line
60        // and closing ')' also on new line
61        foreach (var subtree in node.SubTrees) {
62          strBuilder.AppendLine(FormatRecursively(subtree, indentLength + 2));
63        }
64        if (Indent) strBuilder.Append(' ', indentLength);
65        strBuilder.Append(")");
66      } else {
67        // symbol in the same line with as '(' and ')'
68        strBuilder.Append(node.ToString());
69        strBuilder.Append(")");
70      }
71      return strBuilder.ToString();
72    }
73
74    public override IDeepCloneable Clone(Cloner cloner) {
75      return new SymbolicExpressionTreeStringFormatter(this, cloner);
76    }
77
78  }
79
80}
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