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

   1 //
   2 // System.Windows.Markup.XmlLanguage.cs
   3 //
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   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                         if (ietfLanguageTag == null)
  50                                 throw new NullReferenceException ("ietfLanguageTag");
  51
  52                         // verify language code is all us-ascii alphabetic
  53                         for (i = 0; i < ietfLanguageTag.Length; i++) {
  54                                 if (ietfLanguageTag[i] == '-')
  55                                         break;
  56
  57                                 c = Char.ToLower (ietfLanguageTag[i]);
  58
  59                                 if (c < 'a' || c > 'z')
  60                                         throw new ArgumentException ("ietfLanguageTag");
  61                         }
  62
  63                         // language code needs at least 2 characters (if non-empty)
  64                         if (i > 0 && i < 2)
  65                                 throw new ArgumentException ("ietfLanguageTag");
  66
  67                         if (i < ietfLanguageTag.Length) {
  68                                 i++;
  69
  70                                 // country code needs at least 2 characters
  71                                 if ((ietfLanguageTag.Length - i) < 2)
  72                                         throw new ArgumentException ("ietfLanguageTag");
  73
  74                                 // verify country code is all us-ascii alpha-numeric
  75                                 for ( ; i < ietfLanguageTag.Length; i++) {
  76                                         c = Char.ToLower (ietfLanguageTag[i]);
  77
  78                                         if (!(c >= 'a' && c <= 'z') && !(c >= '0' && c <= '9'))
  79                                                 throw new ArgumentException ("ietfLanguageTag");
  80                                 }
  81                         }
  82
  83                         return new XmlLanguage (ietfLanguageTag);
  84                 }
  85
  86                 public string IetfLanguageTag {
  87                         get { return lang; }
  88                 }
  89
  90                 public override bool Equals (object obj)
  91                 {
  92                         XmlLanguage lang = obj as XmlLanguage;
  93
  94                         if (lang == null)
  95                                 return false;
  96
  97                         return IetfLanguageTag.Equals (lang.IetfLanguageTag);
  98                 }
  99
 100                 public override int GetHashCode ()
 101                 {
 102                         return IetfLanguageTag.GetHashCode ();
 103                 }
 104
 105                 public static bool operator ==(XmlLanguage xmlLanguage1, XmlLanguage xmlLanguage2)
 106                 {
 107                         if ( object.ReferenceEquals(xmlLanguage1, null)
 108                                 || object.ReferenceEquals(xmlLanguage2, null) )
 109                                 return false;
 110
 111                         return xmlLanguage1.IetfLanguageTag == xmlLanguage2.IetfLanguageTag;
 112                 }
 113
 114                 public static bool operator !=(XmlLanguage xmlLanguage1, XmlLanguage xmlLanguage2)
 115                 {
 116                         return !(xmlLanguage1 == xmlLanguage2);
 117                 }
 118         }
 119 }