mcs/class/System.XML/Mono.Xml/XmlNodeWriter.cs

   1 //
   2 // Mono.Xml.XmlNodeWriter
   3 //
   4 // Author:
   5 //      Atsushi Enomoto (ginga@kit.hi-ho.ne.jp)
   6 //
   7 //      (C)2003 Atsushi Enomoto
   8 //
   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 using System;
  31 using System.Xml;
  32
  33 namespace System.Xml
  34 {
  35         internal class XmlNodeWriter : XmlWriter
  36         {
  37                 public XmlNodeWriter () : this (true)
  38                 {
  39                 }
  40
  41                 // It should be public after some tests are done :-)
  42                 public XmlNodeWriter (bool isDocumentEntity)
  43                 {
  44                         doc = new XmlDocument ();
  45                         state = XmlNodeType.None;
  46                         this.isDocumentEntity = isDocumentEntity;
  47                         if (!isDocumentEntity)
  48                                 current = fragment = doc.CreateDocumentFragment ();
  49                 }
  50
  51                 XmlDocument doc;
  52                 bool isClosed;
  53                 // If it is not null, then we are now inside the element.
  54                 XmlNode current;
  55                 // If it is not null, then we are now inside the attribute.
  56                 XmlAttribute attribute;
  57                 // If it is false, then allow to contain multiple document elements.
  58                 bool isDocumentEntity;
  59                 XmlDocumentFragment fragment;
  60
  61                 // None: started or closed.
  62                 // XmlDeclaration: after xmldecl. Never allow xmldecl.
  63                 // DocumentType: after doctype. Never allow xmldecl and doctype.
  64                 // Element: inside document element.
  65                 //
  66                 XmlNodeType state;
  67
  68                 // Properties
  69                 public XmlNode Document {
  70                         get { return isDocumentEntity ? (XmlNode)doc : (XmlNode)fragment; }
  71                 }
  72
  73                 public override WriteState WriteState {
  74                         get {
  75                                 if (isClosed)
  76                                         return WriteState.Closed;
  77                                 if (attribute != null)
  78                                         return WriteState.Attribute;
  79
  80                                 switch (state) {
  81                                 case XmlNodeType.None:
  82                                         return WriteState.Start;
  83                                 case XmlNodeType.XmlDeclaration:
  84                                         return WriteState.Prolog;
  85                                 case XmlNodeType.DocumentType:
  86                                         return WriteState.Element;
  87                                 default:
  88                                         return WriteState.Content;
  89                                 }
  90                         }
  91                 }
  92
  93                 public override string XmlLang {
  94                         get {
  95                                 for (XmlElement n = current as XmlElement; n != null; n = n.ParentNode as XmlElement)
  96                                         if (n.HasAttribute ("xml:lang"))
  97                                                 return n.GetAttribute ("xml:lang");
  98                                 return String.Empty;
  99                         }
 100                 }
 101
 102                 public override XmlSpace XmlSpace {
 103                         get {
 104                                 for (XmlElement n = current as XmlElement; n != null; n = n.ParentNode as XmlElement) {
 105                                         string xs = n.GetAttribute ("xml:space");
 106                                         switch (xs) {
 107                                         case "preserve":
 108                                                 return XmlSpace.Preserve;
 109                                         case "default":
 110                                                 return XmlSpace.Default;
 111                                         case "":
 112                                                 continue;
 113                                         default:
 114                                                 throw new InvalidOperationException (String.Format ("Invalid xml:space {0}.", xs));
 115                                         }
 116                                 }
 117                                 return XmlSpace.None;
 118                         }
 119                 }
 120
 121                 // Private Methods
 122
 123                 private void CheckState ()
 124                 {
 125                         if (isClosed)
 126                                 throw new InvalidOperationException ();
 127
 128                 }
 129
 130                 private void WritePossiblyTopLevelNode (XmlNode n, bool possiblyAttribute)
 131                 {
 132                         CheckState ();
 133                         if (!possiblyAttribute && attribute != null)
 134                                 throw new InvalidOperationException (String.Format ("Current state is not acceptable for {0}.", n.NodeType));
 135
 136                         if (state != XmlNodeType.Element)
 137                                 Document.AppendChild (n);
 138                         else if (attribute != null)
 139                                 attribute.AppendChild (n);
 140                         else
 141                                 current.AppendChild (n);
 142                         if (state == XmlNodeType.None)
 143                                 state = XmlNodeType.XmlDeclaration;
 144                 }
 145
 146                 // Public Methods
 147
 148                 public override void Close ()
 149                 {
 150                         CheckState ();
 151                         isClosed = true;
 152                 }
 153
 154                 public override void Flush ()
 155                 {
 156                 }
 157
 158                 public override string LookupPrefix (string ns)
 159                 {
 160                         CheckState ();
 161                         if (current == null)
 162                                 throw new InvalidOperationException ();
 163                         return current.GetPrefixOfNamespace (ns);
 164                 }
 165
 166                 // StartDocument
 167
 168                 public override void WriteStartDocument ()
 169                 {
 170                         WriteStartDocument (null);
 171                 }
 172
 173                 public override void WriteStartDocument (bool standalone)
 174                 {
 175                         WriteStartDocument (standalone ? "yes" : "no");
 176                 }
 177
 178                 private void WriteStartDocument (string sddecl)
 179                 {
 180                         CheckState ();
 181                         if (state != XmlNodeType.None)
 182                                 throw new InvalidOperationException ("Current state is not acceptable for xmldecl.");
 183
 184                         doc.AppendChild (doc.CreateXmlDeclaration ("1.0", null, sddecl));
 185                         state = XmlNodeType.XmlDeclaration;
 186                 }
 187
 188                 // EndDocument
 189
 190                 public override void WriteEndDocument ()
 191                 {
 192                         CheckState ();
 193
 194                         isClosed = true;
 195                 }
 196
 197                 // DocumentType
 198                 public override void WriteDocType (string name, string publicId, string systemId, string internalSubset)
 199                 {
 200                         CheckState ();
 201                         switch (state) {
 202                         case XmlNodeType.None:
 203                         case XmlNodeType.XmlDeclaration:
 204                                 doc.AppendChild (doc.CreateDocumentType (name, publicId, systemId, internalSubset));
 205                                 state = XmlNodeType.DocumentType;
 206                                 break;
 207                         default:
 208                                 throw new InvalidOperationException ("Current state is not acceptable for doctype.");
 209                         }
 210                 }
 211
 212                 // StartElement
 213
 214                 public override void WriteStartElement (string prefix, string name, string ns)
 215                 {
 216                         CheckState ();
 217                         if (isDocumentEntity && state == XmlNodeType.EndElement && doc.DocumentElement != null)
 218                                 throw new InvalidOperationException ("Current state is not acceptable for startElement.");
 219
 220                         XmlElement el = doc.CreateElement (prefix, name, ns);
 221                         if (current == null) {
 222                                 Document.AppendChild (el);
 223                                 state = XmlNodeType.Element;
 224                         } else {
 225                                 current.AppendChild (el);
 226                                 state = XmlNodeType.Element;
 227                         }
 228
 229                         current = el;
 230                 }
 231
 232                 // EndElement
 233
 234                 public override void WriteEndElement ()
 235                 {
 236                         WriteEndElementInternal (false);
 237                 }
 238
 239                 public override void WriteFullEndElement ()
 240                 {
 241                         WriteEndElementInternal (true);
 242                 }
 243
 244                 private void WriteEndElementInternal (bool forceFull)
 245                 {
 246                         CheckState ();
 247                         if (current == null)
 248                                 throw new InvalidOperationException ("Current state is not acceptable for endElement.");
 249
 250                         if (!forceFull && current.FirstChild == null)
 251                                 ((XmlElement) current).IsEmpty = true;
 252
 253                         if (isDocumentEntity && current.ParentNode == doc)
 254                                 state = XmlNodeType.EndElement;
 255                         else
 256                                 current = current.ParentNode;
 257                 }
 258
 259                 // StartAttribute
 260
 261                 public override void WriteStartAttribute (string prefix, string name, string ns)
 262                 {
 263                         CheckState ();
 264                         if (attribute != null)
 265                                 throw new InvalidOperationException ("There is an open attribute.");
 266                         if (!(current is XmlElement))
 267                                 throw new InvalidOperationException ("Current state is not acceptable for startAttribute.");
 268
 269                         attribute = doc.CreateAttribute (prefix, name, ns);
 270                         ((XmlElement)current).SetAttributeNode (attribute);
 271                 }
 272
 273                 public override void WriteEndAttribute ()
 274                 {
 275                         CheckState ();
 276                         if (attribute == null)
 277                                 throw new InvalidOperationException ("Current state is not acceptable for startAttribute.");
 278
 279                         attribute = null;
 280                 }
 281
 282                 public override void WriteCData (string data)
 283                 {
 284                         CheckState ();
 285                         if (current == null)
 286                                 throw new InvalidOperationException ("Current state is not acceptable for CDATAsection.");
 287
 288                         current.AppendChild (doc.CreateCDataSection (data));
 289                 }
 290
 291                 public override void WriteComment (string comment)
 292                 {
 293                         WritePossiblyTopLevelNode (doc.CreateComment (comment), false);
 294                 }
 295
 296                 public override void WriteProcessingInstruction (string name, string value)
 297                 {
 298                         WritePossiblyTopLevelNode (
 299                                 doc.CreateProcessingInstruction (name, value), false);
 300                 }
 301
 302                 public override void WriteEntityRef (string name)
 303                 {
 304                         WritePossiblyTopLevelNode (doc.CreateEntityReference (name), true);
 305                 }
 306
 307                 public override void WriteCharEntity (char c)
 308                 {
 309                         WritePossiblyTopLevelNode (doc.CreateTextNode (new string (new char [] {c}, 0, 1)), true);
 310                 }
 311
 312                 public override void WriteWhitespace (string ws)
 313                 {
 314                         WritePossiblyTopLevelNode (doc.CreateWhitespace (ws), true);
 315                 }
 316
 317                 public override void WriteString (string data)
 318                 {
 319                         CheckState ();
 320                         if (current == null)
 321                                 throw new InvalidOperationException ("Current state is not acceptable for Text.");
 322
 323                         if (attribute != null)
 324                                 attribute.AppendChild (doc.CreateTextNode (data));
 325                         else {
 326                                 XmlText last = current.LastChild as XmlText;
 327                                 if (last == null)
 328                                         current.AppendChild(doc.CreateTextNode(data));
 329                                 else
 330                                         last.AppendData(data);
 331                         }
 332                 }
 333
 334                 public override void WriteName (string name)
 335                 {
 336                         WriteString (name);
 337                 }
 338
 339                 public override void WriteNmToken (string nmtoken)
 340                 {
 341                         WriteString (nmtoken);
 342                 }
 343
 344                 public override void WriteQualifiedName (string name, string ns)
 345                 {
 346                         string prefix = LookupPrefix (ns);
 347                         if (prefix == null)
 348                                 throw new ArgumentException (String.Format ("Invalid namespace {0}", ns));
 349                         if (prefix != String.Empty)
 350                                 WriteString (name);
 351                         else
 352                                 WriteString (prefix + ":" + name);
 353                 }
 354
 355                 public override void WriteChars (char [] chars, int start, int len)
 356                 {
 357                         WriteString (new string (chars, start, len));
 358                 }
 359
 360                 public override void WriteRaw (string data)
 361                 {
 362                         // It never supports raw string.
 363                         WriteString (data);
 364                 }
 365
 366                 public override void WriteRaw (char [] chars, int start, int len)
 367                 {
 368                         // It never supports raw string.
 369                         WriteChars (chars, start, len);
 370                 }
 371
 372                 public override void WriteBase64 (byte [] data, int start, int len)
 373                 {
 374                         // It never supports raw string.
 375                         WriteString (Convert.ToBase64String (data, start, len));
 376                 }
 377
 378                 public override void WriteBinHex (byte [] data, int start, int len)
 379                 {
 380                         throw new NotImplementedException ();
 381                 }
 382
 383                 public override void WriteSurrogateCharEntity (char c1, char c2)
 384                 {
 385                         throw new NotImplementedException ();
 386                 }
 387         }
 388 }