source: branches/DataPreprocessing/HeuristicLab.Persistence/3.3/Default/Xml/Primitive/String2XmlSerializer.cs @ 11009

Last change on this file since 11009 was 11009, checked in by pfleck, 5 years ago
  • Merged trunk into preprocessing branch.
File size: 3.0 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;
23using System.Text;
24using System.Text.RegularExpressions;
25using HeuristicLab.Persistence.Core;
26
27namespace HeuristicLab.Persistence.Default.Xml.Primitive {
28
29  /// <summary>
30  /// Serializes a string to XML by embedding into a CDATA block.
31  /// </summary>
32  public sealed class String2XmlSerializer : PrimitiveXmlSerializerBase<string> {
33
34    /// <summary>
35    /// Formats the specified string.
36    /// </summary>
37    /// <param name="s">The string.</param>
38    /// <returns>An XmlString that embeds the string s in a CDATA section.</returns>
39    public override XmlString Format(string s) {
40      StringBuilder sb = new StringBuilder();
41      sb.Append("<![CDATA[");
42      sb.Append(s.Replace("]]>", "]]]]><![CDATA[>"));
43      sb.Append("]]>");
44      s = special.Replace(sb.ToString(), m => ToBase64Tag(m.Value));
45      return new XmlString(s);
46    }
47
48    private static readonly Regex re = new Regex(@"<!\[CDATA\[((?:[^]]|\](?!\]>))*)\]\]>|<Base64>([^<]*)</Base64>", RegexOptions.Singleline);
49    private static readonly Regex special = new Regex(@"[\x00-\x08\x0b\x0c\x0e-\x1f]+", RegexOptions.Singleline);
50
51    private static string ToBase64Tag(string s) {
52      return new StringBuilder()
53        .Append("]]><Base64>")
54        .Append(Convert.ToBase64String(Encoding.ASCII.GetBytes(s)))
55        .Append("</Base64><![CDATA[")
56        .ToString();
57    }
58
59    /// <summary>
60    /// Parses the specified XmlString into a string.
61    /// </summary>
62    /// <param name="x">The XMLString.</param>
63    /// <returns>The plain string contained in the XML CDATA section.</returns>
64    public override string Parse(XmlString x) {
65      StringBuilder sb = new StringBuilder();
66      foreach (Match m in re.Matches(x.Data)) {
67        if (m.Groups[1].Success)
68          sb.Append(m.Groups[1].Value);
69        else if (m.Groups[2].Success) {
70          sb.Append(Encoding.ASCII.GetString(Convert.FromBase64String(m.Groups[2].Value)));
71        }
72      }
73      string result = sb.ToString();
74      if (result.Length == 0 && x.Data.Length > 0 && !x.Data.Equals("<![CDATA[]]>"))
75        throw new PersistenceException("Invalid CDATA section during string parsing.");
76      return result;
77    }
78  }
79}
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