XmlLanguage.cs :  » 2.6.4-mono-.net-core » System.Windows » System » Windows » Markup » C# / CSharp Open Source

//
// System.Windows.Markup.XmlLanguage.cs
//
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// Copyright (C) 2008, 2009 Novell, Inc (http://www.novell.com)
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// a copy of this software and associated documentation files (the
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using Mono;
using System;
using System.Globalization;
using System.Windows;
using System.Windows.Media;

namespace System.Windows.Markup{
  public sealed class XmlLanguage {
    string lang;

    internal XmlLanguage (string ietfLanguageTag)
    {
      lang = ietfLanguageTag.ToLower (CultureInfo.InvariantCulture);
    }
    
    public static XmlLanguage GetLanguage (string ietfLanguageTag)
    {
      char c;
      int i;
      
      // verify language code is all us-ascii alphabetic
      for (i = 0; i < ietfLanguageTag.Length; i++) {
        if (ietfLanguageTag[i] == '-')
          break;
        
        c = Char.ToLower (ietfLanguageTag[i]);
        
        if (c < 'a' || c > 'z')
          throw new ArgumentException ("ietfLanguageTag");
      }
      
      // language code needs at least 2 characters (if non-empty)
      if (i > 0 && i < 2)
        throw new ArgumentException ("ietfLanguageTag");
      
      if (i < ietfLanguageTag.Length) {
        i++;
        
        // country code needs at least 2 characters
        if ((ietfLanguageTag.Length - i) < 2)
          throw new ArgumentException ("ietfLanguageTag");
        
        // verify country code is all us-ascii alpha-numeric
        for ( ; i < ietfLanguageTag.Length; i++) {
          c = Char.ToLower (ietfLanguageTag[i]);
          
          if (!(c >= 'a' && c <= 'z') && !(c >= '0' && c <= '9'))
            throw new ArgumentException ("ietfLanguageTag");
        }
      }
      
      return new XmlLanguage (ietfLanguageTag);
    }
    
    public string IetfLanguageTag {
      get { return lang; }
    }
    
    public override bool Equals (object obj)
    {
      XmlLanguage lang = obj as XmlLanguage;
      
      if (lang == null)
        return false;
      
      return IetfLanguageTag.Equals (lang.IetfLanguageTag);
    }
    
    public override int GetHashCode ()
    {
      return IetfLanguageTag.GetHashCode ();
    }
    
    public static bool operator ==(XmlLanguage xmlLanguage1, XmlLanguage xmlLanguage2)
    {
      if ( object.ReferenceEquals(xmlLanguage1, null) 
        || object.ReferenceEquals(xmlLanguage2, null) )
        return false;

      return xmlLanguage1.IetfLanguageTag == xmlLanguage2.IetfLanguageTag;
    }
    
    public static bool operator !=(XmlLanguage xmlLanguage1, XmlLanguage xmlLanguage2)
    {
      return !(xmlLanguage1 == xmlLanguage2);
    }
  }
}