source: trunk/sources/HeuristicLab.Common/3.3/NaturalStringComparer.cs @ 6981

Last change on this file since 6981 was 6981, checked in by mkommend, 11 years ago

#1647: Sorted variable frequencies by the variable name and added NaturalStringComparer.

File size: 1.7 KB
Line 
1#region License Information
2/* HeuristicLab
3 * Copyright (C) 2002-2011 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.RegularExpressions;
24
25namespace HeuristicLab.Common {
26  public class NaturalStringComparer : IComparer<string> {
27    public int Compare(string x, string y) {
28      if (x == y) return 0;
29
30      string[] first = Regex.Split(x, "([0-9]+)");
31      string[] second = Regex.Split(y, "([0-9]+)");
32
33      for (int i = 0; i < first.Length && i < second.Length; i++) {
34        if (first[i] != second[i]) return CompareWithParsing(first[i], second[i]);
35      }
36
37      if (first.Length < second.Length) return -1;
38      if (second.Length < first.Length) return 1;
39      return 0;
40    }
41
42    private int CompareWithParsing(string x, string y) {
43      int first, second;
44      if (int.TryParse(x, out first) && int.TryParse(y, out second))
45        return first.CompareTo(second);
46      return x.CompareTo(y);
47    }
48  }
49}
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