mcs/class/System.XML/System.Xml/XmlDeclaration.cs

   1 //
   2 // System.Xml.XmlDeclaration
   3 //
   4 // Author:
   5 //      Duncan Mak  (duncan@ximian.com)
   6 //      Atsushi Enomotot  (atsushi@ximian.com)
   7 //
   8 // (C) Ximian, Inc.
   9
  10 //
  11 // Permission is hereby granted, free of charge, to any person obtaining
  12 // a copy of this software and associated documentation files (the
  13 // "Software"), to deal in the Software without restriction, including
  14 // without limitation the rights to use, copy, modify, merge, publish,
  15 // distribute, sublicense, and/or sell copies of the Software, and to
  16 // permit persons to whom the Software is furnished to do so, subject to
  17 // the following conditions:
  18 //
  19 // The above copyright notice and this permission notice shall be
  20 // included in all copies or substantial portions of the Software.
  21 //
  22 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  23 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  24 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  25 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  26 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  27 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  28 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  29 //
  30
  31 using System;
  32 using System.Globalization;
  33 using System.Text;
  34 using System.Xml;
  35
  36 namespace System.Xml
  37 {
  38         public class XmlDeclaration : XmlLinkedNode
  39         {
  40                 string encoding = "UTF-8"; // defaults to UTF-8
  41                 string standalone;
  42                 string version;
  43
  44                 protected internal XmlDeclaration (string version, string encoding,
  45                                                    string standalone, XmlDocument doc)
  46                         : base (doc)
  47                 {
  48                         if (encoding == null)
  49                                 encoding = "";
  50
  51                         if (standalone == null)
  52                                 standalone = "";
  53
  54                         this.version = version;
  55                         this.encoding = encoding;
  56                         this.standalone = standalone;
  57                 }
  58
  59                 public string Encoding  {
  60                         get { return encoding; }
  61                         set { encoding = (value == null) ? String.Empty : value; }
  62                 }
  63
  64                 public override string InnerText {
  65                         get { return Value; }
  66                         set { ParseInput (value); }
  67                 }
  68
  69                 public override string LocalName {
  70                         get { return "xml"; }
  71                 }
  72
  73                 public override string Name {
  74                         get { return "xml"; }
  75                 }
  76
  77                 public override XmlNodeType NodeType {
  78                         get { return XmlNodeType.XmlDeclaration; }
  79                 }
  80
  81                 public string Standalone {
  82                         get { return standalone; }
  83                         set {
  84                                 if(value != null)
  85                                 {
  86                                         if (String.Compare (value, "YES", true, CultureInfo.InvariantCulture) == 0)
  87                                                 standalone = "yes";
  88                                         if (String.Compare (value, "NO", true, CultureInfo.InvariantCulture) == 0)
  89                                                 standalone = "no";
  90                                 }
  91                                 else
  92                                         standalone = String.Empty;
  93                         }
  94                 }
  95
  96                 public override string Value {
  97                         get {
  98                                 string formatEncoding = "";
  99                                 string formatStandalone = "";
 100
 101                                 if (encoding != String.Empty)
 102                                         formatEncoding = String.Format (" encoding=\"{0}\"", encoding);
 103
 104                                 if (standalone != String.Empty)
 105                                         formatStandalone = String.Format (" standalone=\"{0}\"", standalone);
 106
 107                                 return String.Format ("version=\"{0}\"{1}{2}", Version, formatEncoding, formatStandalone);
 108                         }
 109                         set { ParseInput (value); }
 110                 }
 111
 112                 public string Version {
 113                         get { return version; }
 114                 }
 115
 116                 public override XmlNode CloneNode (bool deep)
 117                 {
 118                         return new XmlDeclaration (Version, Encoding, standalone, OwnerDocument);
 119                 }
 120
 121                 public override void WriteContentTo (XmlWriter w) {}
 122
 123                 public override void WriteTo (XmlWriter w)
 124                 {
 125                         // This doesn't seem to match up very well with w.WriteStartDocument()
 126                         // so writing out custom here.
 127                         w.WriteRaw (String.Format ("<?xml {0}?>", Value));
 128                 }
 129
 130                 private int SkipWhitespace (string input, int index)
 131                 {
 132                         while (index < input.Length) {
 133                                 if (XmlChar.IsWhitespace (input [index]))
 134                                         index++;
 135                                 else
 136                                         break;
 137                         }
 138                         return index;
 139                 }
 140
 141                 void ParseInput (string input)
 142                 {
 143                         int index = SkipWhitespace (input, 0);
 144                         if (index + 7 > input.Length || input.IndexOf ("version", index, 7) != index)
 145                                 throw new XmlException ("Missing 'version' specification.");
 146                         index = SkipWhitespace (input, index + 7);
 147
 148                         char c = input [index];
 149                         if (c != '=')
 150                                 throw new XmlException ("Invalid 'version' specification.");
 151                         index++;
 152                         index = SkipWhitespace (input, index);
 153                         c = input [index];
 154                         if (c != '"' && c != '\'')
 155                                 throw new XmlException ("Invalid 'version' specification.");
 156                         index++;
 157                         int end = input.IndexOf (c, index);
 158                         if (end < 0 || input.IndexOf ("1.0", index, 3) != index)
 159                                 throw new XmlException ("Invalid 'version' specification.");
 160                         index += 4;
 161                         if (index == input.Length)
 162                                 return;
 163                         if (!XmlChar.IsWhitespace (input [index]))
 164                                 throw new XmlException ("Invalid XML declaration.");
 165                         index = SkipWhitespace (input, index + 1);
 166                         if (index == input.Length)
 167                                 return;
 168
 169                         if (input.Length > index + 8 && input.IndexOf ("encoding", index, 8) > 0) {
 170                                 index = SkipWhitespace (input, index + 8);
 171                                 c = input [index];
 172                                 if (c != '=')
 173                                         throw new XmlException ("Invalid 'version' specification.");
 174                                 index++;
 175                                 index = SkipWhitespace (input, index);
 176                                 c = input [index];
 177                                 if (c != '"' && c != '\'')
 178                                         throw new XmlException ("Invalid 'encoding' specification.");
 179                                 end = input.IndexOf (c, index + 1);
 180                                 if (end < 0)
 181                                         throw new XmlException ("Invalid 'encoding' specification.");
 182                                 Encoding = input.Substring (index + 1, end - index - 1);
 183                                 index = end + 1;
 184                                 if (index == input.Length)
 185                                         return;
 186                                 if (!XmlChar.IsWhitespace (input [index]))
 187                                         throw new XmlException ("Invalid XML declaration.");
 188                                 index = SkipWhitespace (input, index + 1);
 189                         }
 190
 191                         if (input.Length > index + 10 && input.IndexOf ("standalone", index, 10) > 0) {
 192                                 index = SkipWhitespace (input, index + 10);
 193                                 c = input [index];
 194                                 if (c != '=')
 195                                         throw new XmlException ("Invalid 'version' specification.");
 196                                 index++;
 197                                 index = SkipWhitespace (input, index);
 198                                 c = input [index];
 199                                 if (c != '"' && c != '\'')
 200                                         throw new XmlException ("Invalid 'standalone' specification.");
 201                                 end = input.IndexOf (c, index + 1);
 202                                 if (end < 0)
 203                                         throw new XmlException ("Invalid 'standalone' specification.");
 204                                 string tmp = input.Substring (index + 1, end - index - 1);
 205                                 switch (tmp) {
 206                                 case "yes":
 207                                 case "no":
 208                                         break;
 209                                 default:
 210                                         throw new XmlException ("Invalid standalone specification.");
 211                                 }
 212                                 Standalone = tmp;
 213                                 index = end + 1;
 214                                 index = SkipWhitespace (input, index);
 215                         }
 216                         if (index != input.Length)
 217                                 throw new XmlException ("Invalid XML declaration.");
 218                 }
 219         }
 220 }