source: branches/HeuristicLab.DataAnalysis.Symbolic.LinearInterpreter/HeuristicLab.Encodings.SymbolicExpressionTreeEncoding/3.4/Formatters/SymbolicExpressionTreeStringFormatter.cs @ 9732

Last change on this file since 9732 was 9732, checked in by bburlacu, 7 years ago

#2021: Merged trunk changes for HeuristicLab.Encodings.SymbolicExpressionTreeEncoding and HeuristicLab.Problems.DataAnalysis.Symbolic. Replaced prefix iteration of nodes in the linear interpretation with breadth iteration for simplified logic and extra performance. Reversed unnecessary changes to other projects.

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