class/System.Windows/System.Windows.Markup/XmlLanguage.cs

   1 //
   2 // System.Windows.Markup.XmlLanguage.cs
   3 //
   4 // Contact:
   5 //   Moonlight List (moonlight-list@lists.ximian.com)
   6 //
   7 // Copyright (C) 2008, 2009 Novell, Inc (http://www.novell.com)
   8 //
   9 // Permission is hereby granted, free of charge, to any person obtaining
  10 // a copy of this software and associated documentation files (the
  11 // "Software"), to deal in the Software without restriction, including
  12 // without limitation the rights to use, copy, modify, merge, publish,
  13 // distribute, sublicense, and/or sell copies of the Software, and to
  14 // permit persons to whom the Software is furnished to do so, subject to
  15 // the following conditions:
  16 //
  17 // The above copyright notice and this permission notice shall be
  18 // included in all copies or substantial portions of the Software.
  19 //
  20 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  21 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  22 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  23 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  24 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  25 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  26 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  27 //
  28
  29 using Mono;
  30 using System;
  31 using System.Globalization;
  32 using System.Windows;
  33 using System.Windows.Media;
  34
  35 namespace System.Windows.Markup {
  36         public sealed class XmlLanguage {
  37                 string lang;
  38
  39                 internal XmlLanguage (string ietfLanguageTag)
  40                 {
  41                         lang = ietfLanguageTag.ToLower (CultureInfo.InvariantCulture);
  42                 }
  43
  44                 public static XmlLanguage GetLanguage (string ietfLanguageTag)
  45                 {
  46                         char c;
  47                         int i;
  48
  49                         // verify language code is all us-ascii alphabetic
  50                         for (i = 0; i < ietfLanguageTag.Length; i++) {
  51                                 if (ietfLanguageTag[i] == '-')
  52                                         break;
  53
  54                                 c = Char.ToLower (ietfLanguageTag[i]);
  55
  56                                 if (c < 'a' || c > 'z')
  57                                         throw new ArgumentException ("ietfLanguageTag");
  58                         }
  59
  60                         // language code needs at least 2 characters (if non-empty)
  61                         if (i > 0 && i < 2)
  62                                 throw new ArgumentException ("ietfLanguageTag");
  63
  64                         if (i < ietfLanguageTag.Length) {
  65                                 i++;
  66
  67                                 // country code needs at least 2 characters
  68                                 if ((ietfLanguageTag.Length - i) < 2)
  69                                         throw new ArgumentException ("ietfLanguageTag");
  70
  71                                 // verify country code is all us-ascii alpha-numeric
  72                                 for ( ; i < ietfLanguageTag.Length; i++) {
  73                                         c = Char.ToLower (ietfLanguageTag[i]);
  74
  75                                         if (!(c >= 'a' && c <= 'z') && !(c >= '0' && c <= '9'))
  76                                                 throw new ArgumentException ("ietfLanguageTag");
  77                                 }
  78                         }
  79
  80                         return new XmlLanguage (ietfLanguageTag);
  81                 }
  82
  83                 public string IetfLanguageTag {
  84                         get { return lang; }
  85                 }
  86
  87                 public override bool Equals (object obj)
  88                 {
  89                         XmlLanguage lang = obj as XmlLanguage;
  90
  91                         if (lang == null)
  92                                 return false;
  93
  94                         return IetfLanguageTag.Equals (lang.IetfLanguageTag);
  95                 }
  96
  97                 public override int GetHashCode ()
  98                 {
  99                         return IetfLanguageTag.GetHashCode ();
 100                 }
 101
 102                 public static bool operator ==(XmlLanguage xmlLanguage1, XmlLanguage xmlLanguage2)
 103                 {
 104                         if ( object.ReferenceEquals(xmlLanguage1, null)
 105                                 || object.ReferenceEquals(xmlLanguage2, null) )
 106                                 return false;
 107
 108                         return xmlLanguage1.IetfLanguageTag == xmlLanguage2.IetfLanguageTag;
 109                 }
 110
 111                 public static bool operator !=(XmlLanguage xmlLanguage1, XmlLanguage xmlLanguage2)
 112                 {
 113                         return !(xmlLanguage1 == xmlLanguage2);
 114                 }
 115         }
 116 }