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

   1 //
   2 // System.Xml.XmlDocument
   3 //
   4 // Authors:
   5 //   Daniel Weber (daniel-weber@austin.rr.com)
   6 //   Kral Ferch <kral_ferch@hotmail.com>
   7 //   Jason Diamond <jason@injektilo.org>
   8 //   Miguel de Icaza (miguel@ximian.com)
   9 //   Duncan Mak (duncan@ximian.com)
  10 //   Atsushi Enomoto (ginga@kit.hi-ho.ne.jp)
  11 //
  12 // (C) 2001 Daniel Weber
  13 // (C) 2002 Kral Ferch, Jason Diamond, Miguel de Icaza, Duncan Mak,
  14 //   Atsushi Enomoto
  15 //
  16
  17 using System;
  18 using System.IO;
  19 using System.Text;
  20 using System.Xml.XPath;
  21 using System.Diagnostics;
  22 using System.Collections;
  23
  24 namespace System.Xml
  25 {
  26         public class XmlDocument : XmlNode
  27         {
  28                 #region Fields
  29
  30                 XmlLinkedNode lastLinkedChild;
  31                 XmlNameTable nameTable;
  32                 string baseURI = String.Empty;
  33                 XmlImplementation implementation;
  34                 bool preserveWhitespace = false;
  35                 WeakReference reusableXmlTextReader;
  36
  37                 #endregion
  38
  39                 #region Constructors
  40
  41                 public XmlDocument () : this (null, null)
  42                 {
  43                 }
  44
  45                 protected internal XmlDocument (XmlImplementation imp) : this (imp, null)
  46                 {
  47                 }
  48
  49                 public XmlDocument (XmlNameTable nt) : this (null, nt)
  50                 {
  51                 }
  52
  53                 XmlDocument (XmlImplementation impl, XmlNameTable nt) : base (null)
  54                 {
  55                         implementation = (impl != null) ? impl : new XmlImplementation ();
  56                         nameTable = (nt != null) ? nt : implementation.internalNameTable;
  57                         AddDefaultNameTableKeys ();
  58                 }
  59                 #endregion
  60
  61                 #region Events
  62
  63                 public event XmlNodeChangedEventHandler NodeChanged;
  64
  65                 public event XmlNodeChangedEventHandler NodeChanging;
  66
  67                 public event XmlNodeChangedEventHandler NodeInserted;
  68
  69                 public event XmlNodeChangedEventHandler NodeInserting;
  70
  71                 public event XmlNodeChangedEventHandler NodeRemoved;
  72
  73                 public event XmlNodeChangedEventHandler NodeRemoving;
  74
  75                 #endregion
  76
  77                 #region Properties
  78
  79                 public override string BaseURI {
  80                         get {
  81                                 return baseURI;
  82                         }
  83                 }
  84
  85                 // Used to read 'InnerXml's for its descendants at any place.
  86                 internal XmlTextReader ReusableReader {
  87                         get {
  88                                 if(reusableXmlTextReader == null)
  89                                         reusableXmlTextReader = new WeakReference (null);
  90                                 if(!reusableXmlTextReader.IsAlive) {
  91                                         XmlTextReader reader = new XmlTextReader ((TextReader)null);
  92                                         reusableXmlTextReader.Target = reader;
  93                                 }
  94                                 return (XmlTextReader)reusableXmlTextReader.Target;
  95                         }
  96                 }
  97
  98                 public XmlElement DocumentElement {
  99                         get {
 100                                 XmlNode node = FirstChild;
 101
 102                                 while (node != null) {
 103                                         if (node is XmlElement)
 104                                                 break;
 105                                         node = node.NextSibling;
 106                                 }
 107
 108                                 return node != null ? node as XmlElement : null;
 109                         }
 110                 }
 111
 112                 [MonoTODO("It doesn't have internal subset object model.")]
 113                 public virtual XmlDocumentType DocumentType {
 114                         get {
 115                                 foreach(XmlNode n in this.ChildNodes) {
 116                                         if(n.NodeType == XmlNodeType.DocumentType)
 117                                                 return (XmlDocumentType)n;
 118                                 }
 119                                 return null;
 120                         }
 121                 }
 122
 123                 public XmlImplementation Implementation {
 124                         get { return implementation; }
 125                 }
 126
 127                 public override string InnerXml {
 128                         get {
 129                                 return base.InnerXml;
 130                         }
 131                         set {   // reason for overriding
 132                                 this.LoadXml (value);
 133                         }
 134                 }
 135
 136                 public override bool IsReadOnly {
 137                         get { return false; }
 138                 }
 139
 140                 internal override XmlLinkedNode LastLinkedChild {
 141                         get     {
 142                                 return lastLinkedChild;
 143                         }
 144
 145                         set {
 146                                 lastLinkedChild = value;
 147                         }
 148                 }
 149
 150                 public override string LocalName {
 151                         get { return "#document"; }
 152                 }
 153
 154                 public override string Name {
 155                         get { return "#document"; }
 156                 }
 157
 158                 public XmlNameTable NameTable {
 159                         get { return nameTable; }
 160                 }
 161
 162                 public override XmlNodeType NodeType {
 163                         get { return XmlNodeType.Document; }
 164                 }
 165
 166                 internal override XPathNodeType XPathNodeType {
 167                         get {
 168                                 return XPathNodeType.Root;
 169                         }
 170                 }
 171
 172                 public override XmlDocument OwnerDocument {
 173                         get { return null; }
 174                 }
 175
 176                 public bool PreserveWhitespace {
 177                         get { return preserveWhitespace; }
 178                         set { preserveWhitespace = value; }
 179                 }
 180
 181                 internal override string XmlLang {
 182                         get { return String.Empty; }
 183                 }
 184
 185                 [MonoTODO]
 186                 public virtual XmlResolver XmlResolver {
 187                         set { throw new NotImplementedException (); }
 188                 }
 189
 190                 internal override XmlSpace XmlSpace {
 191                         get {
 192                                 return XmlSpace.None;
 193                         }
 194                 }
 195
 196                 #endregion
 197
 198                 #region Methods
 199
 200                 [MonoTODO("Should BaseURI be cloned?")]
 201                 public override XmlNode CloneNode (bool deep)
 202                 {
 203                         XmlDocument doc = implementation.CreateDocument ();
 204                         doc.PreserveWhitespace = PreserveWhitespace;    // required?
 205                         if(deep)
 206                         {
 207                                 foreach(XmlNode n in ChildNodes)
 208                                         doc.AppendChild (doc.ImportNode (n, deep));
 209                         }
 210                         return doc;
 211                 }
 212
 213                 public XmlAttribute CreateAttribute (string name)
 214                 {
 215                         return CreateAttribute (name, String.Empty);
 216                 }
 217
 218                 public XmlAttribute CreateAttribute (string qualifiedName, string namespaceURI)
 219                 {
 220                         string prefix;
 221                         string localName;
 222
 223                         ParseName (qualifiedName, out prefix, out localName);
 224
 225                         return CreateAttribute (prefix, localName, namespaceURI);
 226                 }
 227
 228                 public virtual XmlAttribute CreateAttribute (string prefix, string localName, string namespaceURI)
 229                 {
 230                         if ((localName == null) || (localName == String.Empty))
 231                                 throw new ArgumentException ("The attribute local name cannot be empty.");
 232
 233                         return new XmlAttribute (prefix, localName, namespaceURI, this);
 234                 }
 235
 236                 public virtual XmlCDataSection CreateCDataSection (string data)
 237                 {
 238                         return new XmlCDataSection (data, this);
 239                 }
 240
 241                 public virtual XmlComment CreateComment (string data)
 242                 {
 243                         return new XmlComment (data, this);
 244                 }
 245
 246                 [MonoTODO]
 247                 protected internal virtual XmlAttribute CreateDefaultAttribute (string prefix, string localName, string namespaceURI)
 248                 {
 249                         throw new NotImplementedException ();
 250                 }
 251
 252                 public virtual XmlDocumentFragment CreateDocumentFragment ()
 253                 {
 254                         return new XmlDocumentFragment (this);
 255                 }
 256
 257                 public virtual XmlDocumentType CreateDocumentType (string name, string publicId,
 258                                                                    string systemId, string internalSubset)
 259                 {
 260                         return new XmlDocumentType (name, publicId, systemId, internalSubset, this);
 261                 }
 262
 263                 public XmlElement CreateElement (string name)
 264                 {
 265                         return CreateElement (name, String.Empty);
 266                 }
 267
 268                 public XmlElement CreateElement (
 269                         string qualifiedName,
 270                         string namespaceURI)
 271                 {
 272                         string prefix;
 273                         string localName;
 274
 275                         ParseName (qualifiedName, out prefix, out localName);
 276
 277                         return CreateElement (prefix, localName, namespaceURI);
 278                 }
 279
 280                 public virtual XmlElement CreateElement (
 281                         string prefix,
 282                         string localName,
 283                         string namespaceURI)
 284                 {
 285                         if ((localName == null) || (localName == String.Empty))
 286                                 throw new ArgumentException ("The local name for elements or attributes cannot be null or an empty string.");
 287                         CheckName (localName);
 288                         return new XmlElement (prefix != null ? prefix : String.Empty, localName, namespaceURI != null ? namespaceURI : String.Empty, this);
 289                 }
 290
 291                 public virtual XmlEntityReference CreateEntityReference (string name)
 292                 {
 293                         return new XmlEntityReference (name, this);
 294                 }
 295
 296                 [MonoTODO]
 297                 internal protected virtual XPathNavigator CreateNavigator (XmlNode node)
 298                 {
 299                         throw new NotImplementedException ();
 300                 }
 301
 302                 public virtual XmlNode CreateNode (
 303                         string nodeTypeString,
 304                         string name,
 305                         string namespaceURI)
 306                 {
 307                         return CreateNode (GetNodeTypeFromString (nodeTypeString), name, namespaceURI);
 308                 }
 309
 310                 public virtual XmlNode CreateNode (
 311                         XmlNodeType type,
 312                         string name,
 313                         string namespaceURI)
 314                 {
 315                         string prefix = null;
 316                         string localName = name;
 317
 318                         if ((type == XmlNodeType.Attribute) || (type == XmlNodeType.Element) || (type == XmlNodeType.EntityReference))
 319                                 ParseName (name, out prefix, out localName);
 320
 321                         return CreateNode (type, prefix, localName, namespaceURI);
 322                 }
 323
 324                 public virtual XmlNode CreateNode (
 325                         XmlNodeType type,
 326                         string prefix,
 327                         string name,
 328                         string namespaceURI)
 329                 {
 330                         switch (type) {
 331                                 case XmlNodeType.Attribute: return CreateAttribute (prefix, name, namespaceURI);
 332                                 case XmlNodeType.CDATA: return CreateCDataSection (null);
 333                                 case XmlNodeType.Comment: return CreateComment (null);
 334                                 case XmlNodeType.Document: return new XmlDocument (); // TODO - test to see which constructor to use, i.e. use existing NameTable or not.
 335                                 case XmlNodeType.DocumentFragment: return CreateDocumentFragment ();
 336                                 case XmlNodeType.DocumentType: return CreateDocumentType (null, null, null, null);
 337                                 case XmlNodeType.Element: return CreateElement (prefix, name, namespaceURI);
 338                                 case XmlNodeType.EntityReference: return CreateEntityReference (null);
 339                                 case XmlNodeType.ProcessingInstruction: return CreateProcessingInstruction (null, null);
 340                                 case XmlNodeType.SignificantWhitespace: return CreateSignificantWhitespace (String.Empty);
 341                                 case XmlNodeType.Text: return CreateTextNode (null);
 342                                 case XmlNodeType.Whitespace: return CreateWhitespace (String.Empty);
 343                                 case XmlNodeType.XmlDeclaration: return CreateXmlDeclaration ("1.0", null, null);
 344                                 default: throw new ArgumentOutOfRangeException(String.Format("{0}\nParameter name: {1}",
 345                                                          "Specified argument was out of the range of valid values", type.ToString ()));
 346                         }
 347                 }
 348
 349                 public virtual XmlProcessingInstruction CreateProcessingInstruction (
 350                         string target,
 351                         string data)
 352                 {
 353                         return new XmlProcessingInstruction (target, data, this);
 354                 }
 355
 356                 public virtual XmlSignificantWhitespace CreateSignificantWhitespace (string text)
 357                 {
 358                         foreach (char c in text)
 359                                 if ((c != ' ') && (c != '\r') && (c != '\n') && (c != '\t'))
 360                                     throw new ArgumentException ("Invalid whitespace characters.");
 361
 362                         return new XmlSignificantWhitespace (text, this);
 363                 }
 364
 365                 public virtual XmlText CreateTextNode (string text)
 366                 {
 367                         return new XmlText (text, this);
 368                 }
 369
 370                 public virtual XmlWhitespace CreateWhitespace (string text)
 371                 {
 372                         foreach (char c in text)
 373                                 if ((c != ' ') && (c != '\r') && (c != '\n') && (c != '\t'))
 374                                     throw new ArgumentException ("Invalid whitespace characters.");
 375
 376                         return new XmlWhitespace (text, this);
 377                 }
 378
 379                 public virtual XmlDeclaration CreateXmlDeclaration (string version, string encoding,
 380                                                                     string standalone)
 381                 {
 382                         if (version != "1.0")
 383                                 throw new ArgumentException ("version string is not correct.");
 384
 385                         if  ((standalone != null && standalone != String.Empty) && !((standalone == "yes") || (standalone == "no")))
 386                                 throw new ArgumentException ("standalone string is not correct.");
 387
 388                         return new XmlDeclaration (version, encoding, standalone, this);
 389                 }
 390
 391                 [MonoTODO]
 392                 public virtual XmlElement GetElementById (string elementId)
 393                 {
 394                         throw new NotImplementedException ();
 395                 }
 396
 397                 public virtual XmlNodeList GetElementsByTagName (string name)
 398                 {
 399                         ArrayList nodeArrayList = new ArrayList ();
 400                         this.searchNodesRecursively (this, name, nodeArrayList);
 401                         return new XmlNodeArrayList (nodeArrayList);
 402                 }
 403
 404                 private void searchNodesRecursively (XmlNode argNode, string argName,
 405                         ArrayList argArrayList)
 406                 {
 407                         XmlNodeList xmlNodeList = argNode.ChildNodes;
 408                         foreach (XmlNode node in xmlNodeList){
 409                                 if (node.Name.Equals (argName))
 410                                         argArrayList.Add (node);
 411                                 else
 412                                         this.searchNodesRecursively (node, argName, argArrayList);
 413                         }
 414                 }
 415
 416                 private void searchNodesRecursively (XmlNode argNode, string argName, string argNamespaceURI,
 417                         ArrayList argArrayList)
 418                 {
 419                         XmlNodeList xmlNodeList = argNode.ChildNodes;
 420                         foreach (XmlNode node in xmlNodeList){
 421                                 if (node.LocalName.Equals (argName) && node.NamespaceURI.Equals (argNamespaceURI))
 422                                         argArrayList.Add (node);
 423                                 else
 424                                         this.searchNodesRecursively (node, argName, argNamespaceURI, argArrayList);
 425                         }
 426                 }
 427
 428                 public virtual XmlNodeList GetElementsByTagName (string localName, string namespaceURI)
 429                 {
 430                         ArrayList nodeArrayList = new ArrayList ();
 431                         this.searchNodesRecursively (this, localName, namespaceURI, nodeArrayList);
 432                         return new XmlNodeArrayList (nodeArrayList);
 433                 }
 434
 435                 private XmlNodeType GetNodeTypeFromString (string nodeTypeString)
 436                 {
 437                         switch (nodeTypeString) {
 438                                 case "attribute": return XmlNodeType.Attribute;
 439                                 case "cdatasection": return XmlNodeType.CDATA;
 440                                 case "comment": return XmlNodeType.Comment;
 441                                 case "document": return XmlNodeType.Document;
 442                                 case "documentfragment": return XmlNodeType.DocumentFragment;
 443                                 case "documenttype": return XmlNodeType.DocumentType;
 444                                 case "element": return XmlNodeType.Element;
 445                                 case "entityreference": return XmlNodeType.EntityReference;
 446                                 case "processinginstruction": return XmlNodeType.ProcessingInstruction;
 447                                 case "significantwhitespace": return XmlNodeType.SignificantWhitespace;
 448                                 case "text": return XmlNodeType.Text;
 449                                 case "whitespace": return XmlNodeType.Whitespace;
 450                                 default:
 451                                         throw new ArgumentException(String.Format("The string doesn't represent any node type : {0}.", nodeTypeString));
 452                         }
 453                 }
 454
 455                 [MonoTODO("default attributes (of imported doc); Entity; Notation")]
 456                 public virtual XmlNode ImportNode (XmlNode node, bool deep)
 457                 {
 458                         switch(node.NodeType)
 459                         {
 460                                 case XmlNodeType.Attribute:
 461                                         {
 462                                                 XmlAttribute src_att = node as XmlAttribute;
 463                                                 XmlAttribute dst_att = this.CreateAttribute (src_att.Prefix, src_att.LocalName, src_att.NamespaceURI);
 464                                                 dst_att.Value = src_att.Value;  // always explicitly specified (whether source is specified or not)
 465                                                 return dst_att;
 466                                         }
 467
 468                                 case XmlNodeType.CDATA:
 469                                         return this.CreateCDataSection (node.Value);
 470
 471                                 case XmlNodeType.Comment:
 472                                         return this.CreateComment (node.Value);
 473
 474                                 case XmlNodeType.Document:
 475                                         throw new XmlException ("Document cannot be imported.");
 476
 477                                 case XmlNodeType.DocumentFragment:
 478                                         {
 479                                                 XmlDocumentFragment df = this.CreateDocumentFragment ();
 480                                                 if(deep)
 481                                                 {
 482                                                         foreach(XmlNode n in node.ChildNodes)
 483                                                         {
 484                                                                 df.AppendChild (this.ImportNode (n, deep));
 485                                                         }
 486                                                 }
 487                                                 return df;
 488                                         }
 489
 490                                 case XmlNodeType.DocumentType:
 491                                         throw new XmlException ("DocumentType cannot be imported.");
 492
 493                                 case XmlNodeType.Element:
 494                                         {
 495                                                 XmlElement src = (XmlElement)node;
 496                                                 XmlElement dst = this.CreateElement (src.Prefix, src.LocalName, src.NamespaceURI);
 497                                                 foreach(XmlAttribute attr in src.Attributes)
 498                                                 {
 499                                                         if(attr.Specified)      // copies only specified attributes
 500                                                                 dst.SetAttributeNode ((XmlAttribute)this.ImportNode (attr, deep));
 501                                                         if(DocumentType != null)
 502                                                         {
 503                                                                 // TODO: create default attribute values
 504                                                         }
 505                                                 }
 506                                                 if(deep)
 507                                                 {
 508                                                         foreach(XmlNode n in src.ChildNodes)
 509                                                                 dst.AppendChild (this.ImportNode (n, deep));
 510                                                 }
 511                                                 return dst;
 512                                         }
 513
 514                                 case XmlNodeType.EndElement:
 515                                         throw new XmlException ("Illegal ImportNode call for NodeType.EndElement");
 516                                 case XmlNodeType.EndEntity:
 517                                         throw new XmlException ("Illegal ImportNode call for NodeType.EndEntity");
 518
 519                                 case XmlNodeType.Entity:
 520                                         throw new NotImplementedException ();   // TODO
 521
 522                                 case XmlNodeType.EntityReference:
 523                                         return this.CreateEntityReference (node.Name);
 524
 525                                 case XmlNodeType.None:
 526                                         throw new XmlException ("Illegal ImportNode call for NodeType.None");
 527
 528                                 case XmlNodeType.Notation:
 529                                         throw new NotImplementedException ();   // TODO
 530
 531                                 case XmlNodeType.ProcessingInstruction:
 532                                         XmlProcessingInstruction pi = node as XmlProcessingInstruction;
 533                                         return this.CreateProcessingInstruction (pi.Target, pi.Data);
 534
 535                                 case XmlNodeType.SignificantWhitespace:
 536                                         return this.CreateSignificantWhitespace (node.Value);
 537
 538                                 case XmlNodeType.Text:
 539                                         return this.CreateTextNode (node.Value);
 540
 541                                 case XmlNodeType.Whitespace:
 542                                         return this.CreateWhitespace (node.Value);
 543
 544                                 case XmlNodeType.XmlDeclaration:
 545                                         XmlDeclaration srcDecl = node as XmlDeclaration;
 546                                         return this.CreateXmlDeclaration (srcDecl.Version, srcDecl.Encoding, srcDecl.Standalone);
 547
 548                                 default:
 549                                         throw new NotImplementedException ();
 550                         }
 551                 }
 552
 553                 public virtual void Load (Stream inStream)
 554                 {
 555                         Load (new XmlTextReader (new XmlStreamReader (inStream)));
 556                 }
 557
 558                 public virtual void Load (string filename)
 559                 {
 560                         Load (new XmlTextReader (new XmlStreamReader (filename)));
 561                 }
 562
 563                 public virtual void Load (TextReader txtReader)
 564                 {
 565                         Load (new XmlTextReader (txtReader));
 566                 }
 567
 568                 [MonoTODO("XmlValidatingReader should be used.")]
 569                 public virtual void Load (XmlReader xmlReader)
 570                 {
 571                         // Reset our document
 572                         // For now this just means removing all our children but later this
 573                         // may turn out o need to call a private method that resets other things
 574                         // like properties we have, etc.
 575                         RemoveAll ();
 576
 577                         this.baseURI = xmlReader.BaseURI;
 578
 579                         // create all contents with use of ReadNode()
 580                         do {
 581                                 XmlNode n = ReadNode (xmlReader);
 582                                 if(n == null) break;
 583                                 AppendChild (n);
 584                         } while (true);
 585                 }
 586
 587                 public virtual void LoadXml (string xml)
 588                 {
 589                         XmlReader xmlReader = new XmlTextReader (new StringReader (xml));
 590                         Load (xmlReader);
 591                 }
 592
 593                 internal void onNodeChanged (XmlNode node, XmlNode Parent)
 594                 {
 595                         if (NodeChanged != null)
 596                                 NodeChanged (node, new XmlNodeChangedEventArgs
 597                                         (XmlNodeChangedAction.Change,
 598                                         node, Parent, Parent));
 599                 }
 600
 601                 internal void onNodeChanging(XmlNode node, XmlNode Parent)
 602                 {
 603                         if (NodeChanging != null)
 604                                 NodeChanging (node, new XmlNodeChangedEventArgs
 605                                         (XmlNodeChangedAction.Change,
 606                                         node, Parent, Parent));
 607                 }
 608
 609                 internal void onNodeInserted (XmlNode node, XmlNode newParent)
 610                 {
 611                         if (NodeInserted != null)
 612                                 NodeInserted (node, new XmlNodeChangedEventArgs
 613                                         (XmlNodeChangedAction.Insert,
 614                                         node, null, newParent));
 615                 }
 616
 617                 internal void onNodeInserting (XmlNode node, XmlNode newParent)
 618                 {
 619                         if (NodeInserting != null)
 620                                 NodeInserting (node, new XmlNodeChangedEventArgs
 621                                         (XmlNodeChangedAction.Insert,
 622                                         node, null, newParent));
 623                 }
 624
 625                 internal void onNodeRemoved (XmlNode node, XmlNode oldParent)
 626                 {
 627                         if (NodeRemoved != null)
 628                                 NodeRemoved (node, new XmlNodeChangedEventArgs
 629                                         (XmlNodeChangedAction.Remove,
 630                                         node, oldParent, null));
 631                 }
 632
 633                 internal void onNodeRemoving (XmlNode node, XmlNode oldParent)
 634                 {
 635                         if (NodeRemoving != null)
 636                                 NodeRemoving (node, new XmlNodeChangedEventArgs
 637                                         (XmlNodeChangedAction.Remove,
 638                                         node, oldParent, null));
 639                 }
 640
 641                 private void ParseName (string name, out string prefix, out string localName)
 642                 {
 643                         int indexOfColon = name.IndexOf (':');
 644
 645                         if (indexOfColon != -1) {
 646                                 prefix = name.Substring (0, indexOfColon);
 647                                 localName = name.Substring (indexOfColon + 1);
 648                         } else {
 649                                 prefix = "";
 650                                 localName = name;
 651                         }
 652                 }
 653
 654                 // Checks that Element's name is valid
 655                 private void CheckName (String name)
 656                 {
 657                         // TODO: others validations?
 658                         if (name.IndexOf (" ") >= 0)
 659                                 throw new XmlException ("The ' ' characted cannot be included in a name");
 660                 }
 661
 662                 // Reads XmlReader and creates Attribute Node.
 663                 private XmlAttribute ReadAttributeNode(XmlReader reader)
 664                 {
 665                         if(reader.NodeType == XmlNodeType.Element)
 666                                 reader.MoveToFirstAttribute ();
 667                         else if(reader.NodeType != XmlNodeType.Attribute)
 668                                 throw new InvalidOperationException ("bad position to read attribute.");
 669                         XmlAttribute attribute = CreateAttribute (reader.Prefix, reader.LocalName, reader.NamespaceURI);
 670                         ReadAttributeNodeValue (reader, attribute);
 671                         return attribute;
 672                 }
 673
 674                 // Reads attribute from XmlReader and then creates attribute value children. XmlAttribute also uses this.
 675                 internal void ReadAttributeNodeValue(XmlReader reader, XmlAttribute attribute)
 676                 {
 677                         while(reader.ReadAttributeValue ()) {
 678                                 if(reader.NodeType == XmlNodeType.EntityReference)
 679                                         // FIXME: if DocumentType is available, then try to resolve it.
 680                                         attribute.AppendChild (CreateEntityReference (reader.Name));
 681                                 // FIXME: else if(NodeType == EndEntity) -- reset BaseURI and so on -- ;
 682                                 else
 683                                         // (IMHO) Children of Attribute is likely restricted to Text and EntityReference.
 684                                         attribute.AppendChild (CreateTextNode (reader.Value));
 685                         }
 686                 }
 687
 688                 [MonoTODO("DTD parser is not completed.")]
 689                 public virtual XmlNode ReadNode(XmlReader reader)
 690                 {
 691                         // This logic was formerly defined in 'XmlNode.ConstructDOM()'
 692
 693                         XmlNode resultNode = null;
 694                         XmlNode newNode = null;
 695                         XmlNode currentNode = null;
 696                         // It was originally XmlDocument.Load(reader reader) when mcs was v0.16.
 697                         int startDepth = reader.Depth;
 698                         bool atStart = true;
 699                         bool ignoredWhitespace;
 700                         bool reachedEOF = false;
 701
 702                         do {
 703                                 ignoredWhitespace = false;
 704                                 reader.Read ();
 705                                 if (reader.NodeType == XmlNodeType.None)
 706                                         if (reachedEOF)
 707                                                 throw new Exception ("XML Reader reached to end while reading node.");
 708                                         else
 709                                                 reachedEOF = true;
 710                                 // This complicated check is because we shouldn't make
 711                                 // improper additional XmlReader.Read() by this method itself.
 712                                 if(atStart && (reader.NodeType == XmlNodeType.EndElement ||
 713                                         reader.NodeType == XmlNodeType.EndEntity))
 714                                         throw new InvalidOperationException ("the XmlReader now holds invalid position.");
 715                                 atStart = false;
 716                                 switch (reader.NodeType) {
 717
 718                                 case XmlNodeType.Attribute:
 719                                         newNode = ReadAttributeNode (reader);
 720                                         break;
 721
 722                                 case XmlNodeType.CDATA:
 723                                         newNode = CreateCDataSection (reader.Value);
 724                                         if(currentNode != null)
 725                                                 currentNode.AppendChild (newNode);
 726                                         break;
 727
 728                                 case XmlNodeType.Comment:
 729                                         newNode = CreateComment (reader.Value);
 730                                         if(currentNode != null)
 731                                                 currentNode.AppendChild (newNode);
 732                                         break;
 733
 734                                 case XmlNodeType.Element:
 735                                         XmlElement element = CreateElement (reader.Prefix, reader.LocalName, reader.NamespaceURI);
 736                                         element.IsEmpty = reader.IsEmptyElement;
 737                                         if(currentNode != null)
 738                                                 currentNode.AppendChild (element);
 739                                         else
 740                                                 resultNode = element;
 741
 742                                         // set the element's attributes.
 743                                         while (reader.MoveToNextAttribute ()) {
 744                                                 element.SetAttributeNode (ReadAttributeNode (reader));
 745                                         }
 746
 747                                         reader.MoveToElement ();
 748
 749                                         if (!reader.IsEmptyElement)
 750                                                 currentNode = element;
 751
 752                                         break;
 753
 754                                 case XmlNodeType.EndElement:
 755                                         if(currentNode.Name != reader.Name)
 756                                                 throw new XmlException ("mismatch end tag.");
 757                                         currentNode = currentNode.ParentNode;
 758                                         break;
 759
 760                                 case XmlNodeType.EndEntity:
 761                                         break;  // no operation
 762
 763                                 case XmlNodeType.ProcessingInstruction:
 764                                         newNode = CreateProcessingInstruction (reader.Name, reader.Value);
 765                                         if(currentNode != null)
 766                                                 currentNode.AppendChild (newNode);
 767                                         break;
 768
 769                                 case XmlNodeType.Text:
 770                                         newNode = CreateTextNode (reader.Value);
 771                                         if(currentNode != null)
 772                                                 currentNode.AppendChild (newNode);
 773                                         break;
 774
 775                                 case XmlNodeType.XmlDeclaration:
 776                                         // empty strings are dummy, then gives over setting value contents to setter.
 777                                         newNode = CreateXmlDeclaration ("1.0" , String.Empty, String.Empty);
 778                                         ((XmlDeclaration)newNode).Value = reader.Value;
 779                                         if(currentNode != null)
 780                                                 throw new XmlException ("XmlDeclaration at invalid position.");
 781                                         break;
 782
 783                                 case XmlNodeType.DocumentType:
 784                                         // This logic is kinda hack;-)
 785                                         XmlTextReader xtReader = reader as XmlTextReader;
 786                                         if(xtReader == null) {
 787                                                 xtReader = new XmlTextReader (reader.ReadOuterXml (),
 788                                                         XmlNodeType.DocumentType,
 789                                                         new XmlParserContext (NameTable, ConstructNamespaceManager(), XmlLang, XmlSpace));
 790                                                 xtReader.Read ();
 791                                         }
 792                                         newNode = CreateDocumentType (xtReader.Name,
 793                                                 xtReader.GetAttribute ("PUBLIC"),
 794                                                 xtReader.GetAttribute ("SYSTEM"),
 795                                                 xtReader.Value);
 796                                         if(currentNode != null)
 797                                                 throw new XmlException ("XmlDocumentType at invalid position.");
 798                                         break;
 799
 800                                 case XmlNodeType.EntityReference:
 801                                         newNode = CreateEntityReference (reader.Name);
 802                                         if(currentNode != null)
 803                                                 currentNode.AppendChild (newNode);
 804                                         break;
 805
 806                                 case XmlNodeType.SignificantWhitespace:
 807                                         newNode = CreateSignificantWhitespace (reader.Value);
 808                                         if(currentNode != null)
 809                                                 currentNode.AppendChild (newNode);
 810                                         break;
 811
 812                                 case XmlNodeType.Whitespace:
 813                                         if(PreserveWhitespace) {
 814                                                 newNode = CreateWhitespace (reader.Value);
 815                                                 if(currentNode != null)
 816                                                         currentNode.AppendChild (newNode);
 817                                         }
 818                                         else
 819                                                 ignoredWhitespace = true;
 820                                         break;
 821                                 }
 822                         } while ((!reader.EOF && ignoredWhitespace) ||
 823                                 reader.Depth > startDepth ||
 824                                 // This complicated condition is because reader.Depth was set
 825                                 // before XmlTextReader.depth increments ;-)
 826                                 (reader.Depth == startDepth && reader.NodeType == XmlNodeType.Element && reader.IsEmptyElement == false)
 827                                 );
 828                         return resultNode != null ? resultNode : newNode;
 829                 }
 830
 831                 public virtual void Save(Stream outStream)
 832                 {
 833                         XmlTextWriter xmlWriter = new XmlTextWriter (outStream, Encoding.UTF8);
 834                         xmlWriter.Formatting = Formatting.Indented;
 835                         WriteContentTo (xmlWriter);
 836                         xmlWriter.Close ();
 837                 }
 838
 839                 public virtual void Save (string filename)
 840                 {
 841                         XmlTextWriter xmlWriter = new XmlTextWriter (filename, Encoding.UTF8);
 842                         xmlWriter.Formatting = Formatting.Indented;
 843                         WriteContentTo (xmlWriter);
 844                         xmlWriter.Close ();
 845                 }
 846
 847                 [MonoTODO]
 848                 public virtual void Save (TextWriter writer)
 849                 {
 850                         XmlTextWriter xmlWriter = new XmlTextWriter (writer);
 851                         xmlWriter.Formatting = Formatting.Indented;
 852                         WriteContentTo (xmlWriter);
 853                         xmlWriter.Flush ();
 854                 }
 855
 856                 public virtual void Save (XmlWriter xmlWriter)
 857                 {
 858                         //
 859                         // This should preserve white space if PreserveWhiteSpace is true
 860                         //
 861                         WriteContentTo (xmlWriter);
 862                         xmlWriter.Flush ();
 863                 }
 864
 865                 public override void WriteContentTo (XmlWriter w)
 866                 {
 867                         foreach(XmlNode childNode in ChildNodes) {
 868                                 childNode.WriteTo (w);
 869                         }
 870                 }
 871
 872                 public override void WriteTo (XmlWriter w)
 873                 {
 874                         WriteContentTo (w);
 875                 }
 876
 877                 private void AddDefaultNameTableKeys ()
 878                 {
 879                         // The following keys are default of MS .NET Framework
 880                         nameTable.Add ("#text");
 881                         nameTable.Add ("xml");
 882                         nameTable.Add ("xmlns");
 883                         nameTable.Add ("#entity");
 884                         nameTable.Add ("#document-fragment");
 885                         nameTable.Add ("#comment");
 886                         nameTable.Add ("space");
 887                         nameTable.Add ("id");
 888                         nameTable.Add ("#whitespace");
 889                         nameTable.Add ("http://www.w3.org/2000/xmlns/");
 890                         nameTable.Add ("#cdata-section");
 891                         nameTable.Add ("lang");
 892                         nameTable.Add ("#document");
 893                         nameTable.Add ("#significant-whitespace");
 894                 }
 895                 #endregion
 896         }
 897 }