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source: branches/SmalltalkExport/HeuristicLab.Encodings.SymbolicExpressionTreeEncoding/3.3/SymbolicExpressionTreeStringFormatter.cs @ 4803

Last change on this file since 4803 was 4803, checked in by swinkler, 13 years ago

Created branch for implementing Smalltalk representation of formulas. (#1270)

File size: 2.2 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;
23
24namespace HeuristicLab.Encodings.SymbolicExpressionTreeEncoding {
25 
26  public class SymbolicExpressionTreeStringFormatter {
27   
28    public bool Indent { get; set; }
29   
30    public SymbolicExpressionTreeStringFormatter()
31      : base() {
32      Indent = true;
33    }
34
35    public string Format(SymbolicExpressionTree symbolicExpressionTree) {
36      return FormatRecursively(symbolicExpressionTree.Root, 0);
37    }
38
39    private string FormatRecursively(SymbolicExpressionTreeNode node, int indentLength) {
40      StringBuilder strBuilder = new StringBuilder();
41      if (Indent) strBuilder.Append(' ', indentLength);
42      strBuilder.Append("(");
43      // internal nodes or leaf nodes?
44      if (node.SubTrees.Count > 0) {
45        // symbol on same line as '('
46        strBuilder.AppendLine(node.ToString());
47        // each subtree expression on a new line
48        // and closing ')' also on new line
49        foreach (var subtree in node.SubTrees) {
50          strBuilder.AppendLine(FormatRecursively(subtree, indentLength + 2));
51        }
52        if (Indent) strBuilder.Append(' ', indentLength);
53        strBuilder.Append(")");
54      } else {
55        // symbol in the same line with as '(' and ')'
56        strBuilder.Append(node.ToString());
57        strBuilder.Append(")");
58      }
59      return strBuilder.ToString();
60    }
61  }
62}
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