mcs/class/System.XML/Mono.Xml.XPath/XPathNavigatorReader.cs

   1 //\r
   2 // XPathNavigatorReader.cs\r
   3 //\r
   4 // Author:\r
   5 //      Atsushi Enomoto <ginga@kit.hi-ho.ne.jp>\r
   6 //\r
   7 // 2003 Atsushi Enomoto. No rights reserved.\r
   8 // Copyright (C) 2004 Novell Inc.\r
   9 \r
  10 //\r
  11 // Permission is hereby granted, free of charge, to any person obtaining\r
  12 // a copy of this software and associated documentation files (the\r
  13 // "Software"), to deal in the Software without restriction, including\r
  14 // without limitation the rights to use, copy, modify, merge, publish,\r
  15 // distribute, sublicense, and/or sell copies of the Software, and to\r
  16 // permit persons to whom the Software is furnished to do so, subject to\r
  17 // the following conditions:\r
  18 // \r
  19 // The above copyright notice and this permission notice shall be\r
  20 // included in all copies or substantial portions of the Software.\r
  21 // \r
  22 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,\r
  23 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF\r
  24 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND\r
  25 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE\r
  26 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION\r
  27 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION\r
  28 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.\r
  29 //\r
  30 #if NET_2_0\r
  31 \r
  32 using System;\r
  33 using System.Text;\r
  34 using System.Xml;\r
  35 using System.Xml.Schema;\r
  36 using System.Xml.XPath;\r
  37 \r
  38 namespace Mono.Xml.XPath\r
  39 {\r
  40 \r
  41         internal class XPathNavigatorReader : XmlReader\r
  42         {\r
  43                 public XPathNavigatorReader (XPathNavigator nav)\r
  44                 {\r
  45                         // It seems that this class have only to support linked\r
  46                         // node as its parameter\r
  47                         switch (nav.NodeType) {\r
  48                         case XPathNodeType.Attribute:\r
  49                         case XPathNodeType.Namespace:\r
  50                                 throw new InvalidOperationException (String.Format ("NodeType {0} is not supported to read as a subtree of an XPathNavigator.", nav.NodeType));\r
  51                         }\r
  52                         root = nav.Clone ();\r
  53                         current = nav.Clone ();\r
  54                 }\r
  55 \r
  56                 XPathNavigator root;\r
  57                 XPathNavigator current;\r
  58                 bool started;\r
  59                 bool closed;\r
  60                 bool endElement;\r
  61                 bool attributeValueConsumed;\r
  62                 StringBuilder readStringBuffer = new StringBuilder ();\r
  63                 StringBuilder innerXmlBuilder = new StringBuilder ();\r
  64 \r
  65                 int depth = 0;\r
  66                 int attributeCount = 0;\r
  67                 bool eof;\r
  68                 bool nextIsEOF;\r
  69 \r
  70                 #region Properties\r
  71                 public override XmlNodeType NodeType \r
  72                 {\r
  73                         get {\r
  74                                 if (ReadState != ReadState.Interactive)\r
  75                                         return XmlNodeType.None;\r
  76                                 if (endElement)\r
  77                                         return XmlNodeType.EndElement;\r
  78                                 if (attributeValueConsumed)\r
  79                                         // Is there any way to get other kind of nodes than Text?\r
  80                                         return XmlNodeType.Text;\r
  81 \r
  82                                 switch (current.NodeType) {\r
  83                                 case XPathNodeType.Namespace:\r
  84                                 case XPathNodeType.Attribute:\r
  85                                         return XmlNodeType.Attribute;\r
  86                                 case XPathNodeType.Comment:\r
  87                                         return XmlNodeType.Comment;\r
  88                                 case XPathNodeType.Element:\r
  89                                         return XmlNodeType.Element;\r
  90                                 case XPathNodeType.ProcessingInstruction:\r
  91                                         return XmlNodeType.ProcessingInstruction;\r
  92                                 case XPathNodeType.Root:\r
  93                                         // It is actually Document, but in XmlReader there is no such situation to return Document.\r
  94                                         return XmlNodeType.None;\r
  95                                 case XPathNodeType.SignificantWhitespace:\r
  96                                         return XmlNodeType.SignificantWhitespace;\r
  97                                 case XPathNodeType.Text:\r
  98                                         return XmlNodeType.Text;\r
  99                                 case XPathNodeType.Whitespace:\r
 100                                         return XmlNodeType.Whitespace;\r
 101                                 default:\r
 102                                         throw new InvalidOperationException (String.Format ("Current XPathNavigator status is {0} which is not acceptable to XmlReader.", current.NodeType));\r
 103                                 }\r
 104                         }\r
 105                 }\r
 106 \r
 107                 public override string Name {\r
 108                         get {\r
 109                                 if (eof)\r
 110                                         return String.Empty;\r
 111                                 else if (current.NodeType == XPathNodeType.Namespace)\r
 112                                         return current.Name == String.Empty ? "xmlns" : "xmlns:" + current.Name;\r
 113                                 else\r
 114                                         return current.Name;\r
 115                         }\r
 116                 }\r
 117 \r
 118                 public override string LocalName {\r
 119                         get {\r
 120                                 if (eof)\r
 121                                         return String.Empty;\r
 122                                 else if (current.NodeType == XPathNodeType.Namespace && current.LocalName == String.Empty)\r
 123                                         return "xmlns";\r
 124                                 else\r
 125                                         return current.LocalName;\r
 126                         }\r
 127                 }\r
 128 \r
 129                 public override string NamespaceURI {\r
 130                         get {\r
 131                                 if (eof)\r
 132                                         return String.Empty;\r
 133                                 else if (current.NodeType == XPathNodeType.Namespace)\r
 134                                         return XmlNamespaceManager.XmlnsXmlns;\r
 135                                 else\r
 136                                         return current.NamespaceURI;\r
 137                         }\r
 138                 }\r
 139 \r
 140                 public override string Prefix {\r
 141                         get {\r
 142                                 if (eof)\r
 143                                         return String.Empty;\r
 144                                 else if (current.NodeType == XPathNodeType.Namespace && current.LocalName != String.Empty)\r
 145                                         return "xmlns";\r
 146                                 else\r
 147                                         return current.Prefix;\r
 148                         }\r
 149                 }\r
 150 \r
 151                 public override bool HasValue {\r
 152                         get {\r
 153                                 switch (current.NodeType) {\r
 154                                 case XPathNodeType.Namespace:\r
 155                                 case XPathNodeType.Attribute:\r
 156                                 case XPathNodeType.Comment:\r
 157                                 case XPathNodeType.ProcessingInstruction:\r
 158                                 case XPathNodeType.SignificantWhitespace:\r
 159                                 case XPathNodeType.Text:\r
 160                                 case XPathNodeType.Whitespace:\r
 161                                         return true;\r
 162                                 }\r
 163                                 return false;\r
 164                         }\r
 165                 }\r
 166 \r
 167                 public override int Depth {\r
 168                         get {\r
 169                                 switch (ReadState) {\r
 170                                 case ReadState.EndOfFile:\r
 171                                 case ReadState.Initial:\r
 172                                 case ReadState.Closed:\r
 173                                         return 0;\r
 174                                 }\r
 175                                 return depth;\r
 176                         }\r
 177                 }\r
 178 \r
 179                 public override string Value {\r
 180                         get {\r
 181                                 switch (current.NodeType) {\r
 182                                 case XPathNodeType.Namespace:\r
 183                                 case XPathNodeType.Attribute:\r
 184                                 case XPathNodeType.Comment:\r
 185                                 case XPathNodeType.ProcessingInstruction:\r
 186                                 case XPathNodeType.SignificantWhitespace:\r
 187                                 case XPathNodeType.Text:\r
 188                                 case XPathNodeType.Whitespace:\r
 189                                         return current.Value;\r
 190                                 case XPathNodeType.Element:\r
 191                                 case XPathNodeType.Root:\r
 192                                         return String.Empty;\r
 193                                 default:\r
 194                                         throw new InvalidOperationException ("Current XPathNavigator status is {0} which is not acceptable to XmlReader.");\r
 195                                 }\r
 196                         }\r
 197                 }\r
 198 \r
 199                 public override string BaseURI {\r
 200                         get { return current.BaseURI; }\r
 201                 }\r
 202 \r
 203                 public override bool IsEmptyElement {\r
 204                         get { return current.IsEmptyElement; }\r
 205                 }\r
 206 \r
 207                 public override bool IsDefault {\r
 208                         get {\r
 209                                 IXmlSchemaInfo si = current as IXmlSchemaInfo;\r
 210                                 return si != null && si.IsDefault;\r
 211                         }\r
 212                 }\r
 213 \r
 214                 // It makes no sense.\r
 215                 public override char QuoteChar {\r
 216                         get { return '\"'; }\r
 217                 }\r
 218 \r
 219                 public override string XmlLang {\r
 220                         get { return current.XmlLang; }\r
 221                 }\r
 222 \r
 223                 // It is meaningless.\r
 224                 public override XmlSpace XmlSpace {\r
 225                         get { return XmlSpace.None; }\r
 226                 }\r
 227 \r
 228                 public override int AttributeCount {\r
 229                         get { return attributeCount; }\r
 230                 }\r
 231 \r
 232                 private int GetAttributeCount ()\r
 233                 {\r
 234                         int count = 0;\r
 235                         if (current.MoveToFirstAttribute ()) {\r
 236                                 do {\r
 237                                         count++;\r
 238                                 } while (current.MoveToNextAttribute ());\r
 239                                 current.MoveToParent ();\r
 240                         }\r
 241                         if (current.MoveToFirstNamespace (XPathNamespaceScope.Local)) {\r
 242                                 do {\r
 243                                         count++;\r
 244                                 } while (current.MoveToNextNamespace (XPathNamespaceScope.Local));\r
 245                                 current.MoveToParent ();\r
 246                         }\r
 247                         return count;\r
 248                 }\r
 249                 \r
 250                 private bool MoveToAttributeNavigator (int i)\r
 251                 {\r
 252                         switch (current.NodeType) {\r
 253                         case XPathNodeType.Namespace:\r
 254                         case XPathNodeType.Attribute:\r
 255                                 this.MoveToElement ();\r
 256                                 goto case XPathNodeType.Element;\r
 257                         case XPathNodeType.Element:\r
 258                                 int count = 0;\r
 259                                 if (MoveToFirstAttribute ()) {\r
 260                                         if (i == 0)\r
 261                                                 return true;\r
 262                                 }\r
 263                                 for (count++; this.MoveToNextAttribute (); count++) {\r
 264                                         if (count == i)\r
 265                                                 return true;\r
 266                                 }\r
 267                                 break;\r
 268                         }\r
 269                         return false;\r
 270                 }\r
 271 \r
 272                 public override string this [int i] {\r
 273                         get {\r
 274                                 XPathNavigator backup = current.Clone ();\r
 275                                 try {\r
 276                                         if (MoveToAttributeNavigator (i))\r
 277                                                 return Value;\r
 278                                         else\r
 279                                                 throw new ArgumentOutOfRangeException ();\r
 280                                 } finally {\r
 281                                         current.MoveTo (backup);\r
 282                                 }\r
 283                         }\r
 284                 }\r
 285 \r
 286                 private void SplitName (string name, out string localName, out string ns)\r
 287                 {\r
 288                         localName = name;\r
 289                         ns = String.Empty;\r
 290                         int colon = name.IndexOf (':');\r
 291                         if (colon > 0) {\r
 292                                 localName = name.Substring (colon + 1, name.Length - colon - 1);\r
 293                                 ns = this.LookupNamespace (name.Substring (0, colon));\r
 294                         }\r
 295                 }\r
 296 \r
 297                 public override string this [string name] {\r
 298                         get {\r
 299                                 string localName;\r
 300                                 string ns;\r
 301                                 SplitName (name, out localName, out ns);\r
 302                                 return this [localName, ns];\r
 303                         }\r
 304                 }\r
 305 \r
 306                 public override string this [string localName, string namespaceURI] {\r
 307                         get {\r
 308                                 string v = current.GetAttribute (localName, namespaceURI);\r
 309                                 if (v != String.Empty)\r
 310                                         return v;\r
 311                                 XPathNavigator tmp = current.Clone ();\r
 312                                 return tmp.MoveToAttribute (localName, namespaceURI) ? String.Empty : null;\r
 313                         }\r
 314                 }\r
 315 \r
 316                 public override bool EOF {\r
 317                         get { return ReadState == ReadState.EndOfFile; }\r
 318                 }\r
 319 \r
 320                 public override ReadState ReadState {\r
 321                         get {\r
 322                                 if (eof)\r
 323                                         return ReadState.EndOfFile;\r
 324                                 if (closed)\r
 325                                         return ReadState.Closed;\r
 326                                 else if (!started)\r
 327                                         return ReadState.Initial;\r
 328                                 return ReadState.Interactive;\r
 329                         }\r
 330                 }\r
 331 \r
 332                 public override XmlNameTable NameTable {\r
 333                         get { return current.NameTable; }\r
 334                 }\r
 335                 #endregion\r
 336 \r
 337                 #region Methods\r
 338 \r
 339                 public override string GetAttribute (string name)\r
 340                 {\r
 341                         string localName;\r
 342                         string ns;\r
 343                         SplitName (name, out localName, out ns);\r
 344                         return this [localName, ns];\r
 345                 }\r
 346 \r
 347                 public override string GetAttribute (string localName, string namespaceURI)\r
 348                 {\r
 349                         return this [localName, namespaceURI];\r
 350                 }\r
 351 \r
 352                 public override string GetAttribute (int i)\r
 353                 {\r
 354                         return this [i];\r
 355                 }\r
 356 \r
 357                 private bool CheckAttributeMove (bool b)\r
 358                 {\r
 359                         if (b)\r
 360                                 attributeValueConsumed = false;\r
 361                         return b;\r
 362                 }\r
 363 \r
 364                 public override bool MoveToAttribute (string name)\r
 365                 {\r
 366                         string localName;\r
 367                         string ns;\r
 368                         SplitName (name, out localName, out ns);\r
 369                         return CheckAttributeMove (MoveToAttribute (localName, ns));\r
 370                 }\r
 371 \r
 372                 public override bool MoveToAttribute (string localName, string namespaceURI)\r
 373                 {\r
 374                         XPathNavigator backup = null;\r
 375                         switch (current.NodeType) {\r
 376                         case XPathNodeType.Attribute:\r
 377                                 backup = current.Clone ();\r
 378                                 this.MoveToElement ();\r
 379                                 goto case XPathNodeType.Element;\r
 380                         case XPathNodeType.Element:\r
 381                                 while (MoveToNextAttribute ())\r
 382                                         if (current.LocalName == localName && current.NamespaceURI == namespaceURI) {\r
 383                                                 attributeValueConsumed = false;\r
 384                                                 return true;\r
 385                                         }\r
 386                                 break;\r
 387                         }\r
 388                         if (backup != null)\r
 389                                 current = backup;\r
 390                         return false;\r
 391                 }\r
 392 \r
 393                 public override void MoveToAttribute (int i)\r
 394                 {\r
 395                         if (!MoveToAttributeNavigator (i))\r
 396                                 throw new ArgumentOutOfRangeException ();\r
 397                 }\r
 398 \r
 399                 public override bool MoveToFirstAttribute ()\r
 400                 {\r
 401                         bool b = CheckAttributeMove (current.MoveToFirstNamespace (XPathNamespaceScope.Local));\r
 402                         if (b)\r
 403                                 return true;\r
 404                         return CheckAttributeMove (current.MoveToFirstAttribute ());\r
 405                 }\r
 406 \r
 407                 public override bool MoveToNextAttribute ()\r
 408                 {\r
 409                         if (current.NodeType == XPathNodeType.Namespace) {\r
 410                                 bool b = CheckAttributeMove (current.MoveToNextNamespace (XPathNamespaceScope.Local));\r
 411                                 if (b)\r
 412                                         return true;\r
 413                                 current.MoveToParent ();\r
 414                                 b = CheckAttributeMove (current.MoveToFirstAttribute ());\r
 415                                 if (b)\r
 416                                         return true;\r
 417                         }\r
 418                         return CheckAttributeMove (current.MoveToNextAttribute ());\r
 419                 }\r
 420 \r
 421                 public override bool MoveToElement ()\r
 422                 {\r
 423                         if (current.NodeType == XPathNodeType.Attribute ||\r
 424                                 current.NodeType == XPathNodeType.Namespace) {\r
 425                                 attributeValueConsumed = false;\r
 426                                 return current.MoveToParent ();\r
 427                         }\r
 428                         return false;\r
 429                 }\r
 430 \r
 431                 public override void Close ()\r
 432                 {\r
 433                         closed = true;\r
 434                         eof = true;\r
 435                 }\r
 436 \r
 437                 public override bool Read ()\r
 438                 {\r
 439                         switch (ReadState) {\r
 440                         case ReadState.EndOfFile:\r
 441                         case ReadState.Closed:\r
 442                         case ReadState.Error:\r
 443                                 return false;\r
 444                         case ReadState.Initial:\r
 445                                 started = true;\r
 446                                 switch (current.NodeType) {\r
 447                                 case XPathNodeType.Root:\r
 448                                         // recurse, but as Interactive\r
 449                                         return Read ();\r
 450                                 case XPathNodeType.Element:\r
 451                                         if (current.IsEmptyElement)\r
 452                                                 nextIsEOF = true;\r
 453                                         attributeCount = GetAttributeCount ();\r
 454                                         return true;\r
 455                                 default:\r
 456                                         nextIsEOF = true;\r
 457                                         return true;\r
 458                                 }\r
 459                                 break;\r
 460                         }\r
 461 \r
 462                         if (nextIsEOF) {\r
 463                                 nextIsEOF = false;\r
 464                                 eof = true;\r
 465                                 return false;\r
 466                         }\r
 467 \r
 468                         MoveToElement ();\r
 469 \r
 470                         if (endElement || !current.MoveToFirstChild ()) {\r
 471                                 if (current.IsSamePosition (root)) {    // It should happen only when the root node was empty.\r
 472                                         eof = true;\r
 473                                         return false;\r
 474                                 }\r
 475                                 if (!current.MoveToNext ()) {\r
 476                                         current.MoveToParent ();\r
 477                                         depth--;\r
 478                                         endElement = (current.NodeType == XPathNodeType.Element);\r
 479                                         if (current.IsSamePosition (root)) {\r
 480                                                 if (current.NodeType == XPathNodeType.Element)\r
 481                                                         nextIsEOF = true;\r
 482                                                 else {\r
 483                                                         endElement = false;\r
 484                                                         eof = true;\r
 485                                                         return false;\r
 486                                                 }\r
 487                                         }\r
 488                                 } else\r
 489                                         endElement = false;\r
 490                         }\r
 491                         else if (!endElement)\r
 492                                 depth++;\r
 493                         attributeCount = GetAttributeCount ();\r
 494                         return true;\r
 495                 }\r
 496 \r
 497                 public override string ReadString ()\r
 498                 {\r
 499                         readStringBuffer.Length = 0;\r
 500 \r
 501                         switch (NodeType) {\r
 502                         default:\r
 503                                 return String.Empty;\r
 504                         case XmlNodeType.Element:\r
 505                                 if (IsEmptyElement)\r
 506                                         return String.Empty;\r
 507                                 do {\r
 508                                         Read ();\r
 509                                         switch (NodeType) {\r
 510                                         case XmlNodeType.Text:\r
 511                                         case XmlNodeType.CDATA:\r
 512                                         case XmlNodeType.Whitespace:\r
 513                                         case XmlNodeType.SignificantWhitespace:\r
 514                                                 readStringBuffer.Append (Value);\r
 515                                                 continue;\r
 516                                         }\r
 517                                         break;\r
 518                                 } while (true);\r
 519                                 break;\r
 520                         case XmlNodeType.Text:\r
 521                         case XmlNodeType.CDATA:\r
 522                         case XmlNodeType.Whitespace:\r
 523                         case XmlNodeType.SignificantWhitespace:\r
 524                                 do {\r
 525                                         switch (NodeType) {\r
 526                                         case XmlNodeType.Text:\r
 527                                         case XmlNodeType.CDATA:\r
 528                                         case XmlNodeType.Whitespace:\r
 529                                         case XmlNodeType.SignificantWhitespace:\r
 530                                                 readStringBuffer.Append (Value);\r
 531                                                 Read ();\r
 532                                                 continue;\r
 533                                         }\r
 534                                         break;\r
 535                                 } while (true);\r
 536                                 break;\r
 537                         }\r
 538                         string ret = readStringBuffer.ToString ();\r
 539                         readStringBuffer.Length = 0;\r
 540                         return ret;\r
 541                 }\r
 542 \r
 543 #if NET_1_1\r
 544 #else\r
 545                 public override string ReadInnerXml ()\r
 546                 {\r
 547                         if (ReadState != ReadState.Interactive)\r
 548                                 return String.Empty;\r
 549 \r
 550                         switch (NodeType) {\r
 551                         case XmlNodeType.Attribute:\r
 552                                 return Value;\r
 553                         case XmlNodeType.Element:\r
 554                                 if (IsEmptyElement)\r
 555                                         return String.Empty;\r
 556 \r
 557                                 int startDepth = Depth;\r
 558 \r
 559                                 innerXmlBuilder.Length = 0;\r
 560                                 bool loop = true;\r
 561                                 do {\r
 562                                         Read ();\r
 563                                         if (NodeType ==XmlNodeType.None)\r
 564                                                 throw new InvalidOperationException ("unexpected end of xml.");\r
 565                                         else if (NodeType == XmlNodeType.EndElement && Depth == startDepth) {\r
 566                                                 loop = false;\r
 567                                                 Read ();\r
 568                                         }\r
 569                                         else\r
 570                                                 innerXmlBuilder.Append (GetCurrentTagMarkup ());\r
 571                                 } while (loop);\r
 572                                 string xml = innerXmlBuilder.ToString ();\r
 573                                 innerXmlBuilder.Length = 0;\r
 574                                 return xml;\r
 575                         case XmlNodeType.None:\r
 576                                 // MS document is incorrect. Seems not to progress.\r
 577                                 return String.Empty;\r
 578                         default:\r
 579                                 Read ();\r
 580                                 return String.Empty;\r
 581                         }\r
 582                 }\r
 583                 \r
 584                 StringBuilder atts = new StringBuilder ();\r
 585                 private string GetCurrentTagMarkup ()\r
 586                 {\r
 587                         switch (NodeType) {\r
 588                         case XmlNodeType.CDATA:\r
 589                                 return String.Format ("<![CDATA[{0}]]>", Value.Replace ("]]>", "]]&gt;"));\r
 590                         case XmlNodeType.Text:\r
 591                                 return Value.Replace ("<", "&lt;");\r
 592                         case XmlNodeType.Comment:\r
 593                                 return String.Format ("<!--{0}-->", Value);\r
 594                         case XmlNodeType.SignificantWhitespace:\r
 595                         case XmlNodeType.Whitespace:\r
 596                                 return Value;\r
 597                         case XmlNodeType.EndElement:\r
 598                                 return String.Format ("</{0}>", Name);\r
 599                         }\r
 600 \r
 601                         bool isEmpty = IsEmptyElement;\r
 602                         string name = Name;\r
 603                         atts.Length = 0;\r
 604                         XPathNavigator temp = current.Clone ();\r
 605                         while (temp.MoveToNextAttribute ())\r
 606                                 atts.AppendFormat (" {0}='{1}'", temp.Name, temp.Value.Replace ("'", "&apos;"));\r
 607                         if (!IsEmptyElement)\r
 608                                 return String.Format ("<{0}{1}>", name, atts);\r
 609                         else\r
 610                                 return String.Format ("<{0}{1} />", name, atts);\r
 611                 }\r
 612 \r
 613                 // Arranged copy of XmlTextReader.ReadOuterXml()\r
 614                 public override string ReadOuterXml ()\r
 615                 {\r
 616                         if (ReadState != ReadState.Interactive)\r
 617                                 return String.Empty;\r
 618 \r
 619                         switch (NodeType) {\r
 620                         case XmlNodeType.Attribute:\r
 621                                 // strictly incompatible with MS... (it holds spaces attribute between name, value and "=" char (very trivial).\r
 622                                 return String.Format ("{0}={1}{2}{1}", Name, QuoteChar, ReadInnerXml ());\r
 623                         case XmlNodeType.Element:\r
 624                                 bool isEmpty = IsEmptyElement;\r
 625                                 string name = Name;\r
 626                                 StringBuilder atts = new StringBuilder ();\r
 627                                 XPathNavigator temp = current.Clone ();\r
 628                                 while (temp.MoveToNextAttribute ())\r
 629                                         atts.AppendFormat (" {0}='{1}'", temp.Name, temp.Value.Replace ("'", "&apos;"));\r
 630 \r
 631                                 if (!isEmpty)\r
 632                                         return String.Format ("{0}{1}</{2}>", GetCurrentTagMarkup (), atts, ReadInnerXml (), name);\r
 633                                 else\r
 634                                         return String.Format ("{0}", GetCurrentTagMarkup ());\r
 635                         case XmlNodeType.None:\r
 636                                 // MS document is incorrect. Seems not to progress.\r
 637                                 return String.Empty;\r
 638                         default:\r
 639                                 Read ();\r
 640                                 return String.Empty;\r
 641                         }\r
 642                 }\r
 643 #endif\r
 644 \r
 645                 public override string LookupNamespace (string prefix)\r
 646                 {\r
 647                         XPathNavigator backup = current.Clone ();\r
 648                         try {\r
 649                                 this.MoveToElement ();\r
 650                                 if (current.MoveToFirstNamespace ()) {\r
 651                                         do {\r
 652                                                 if (current.LocalName == prefix)\r
 653                                                         return current.Value;\r
 654                                         } while (current.MoveToNextNamespace ());\r
 655                                 }\r
 656                                 return null;\r
 657                         } finally {\r
 658                                 current = backup;\r
 659                         }\r
 660                 }\r
 661 \r
 662                 // It does not support entity resolution.\r
 663                 public override void ResolveEntity ()\r
 664                 {\r
 665                         throw new InvalidOperationException ();\r
 666                 }\r
 667 \r
 668                 public override bool ReadAttributeValue () {\r
 669                         if (NodeType != XmlNodeType.Attribute)\r
 670                                 return false;\r
 671                         if (attributeValueConsumed)\r
 672                                 return false;\r
 673                         attributeValueConsumed = true;\r
 674                         return true;\r
 675                 }\r
 676                 #endregion\r
 677         }\r
 678 }\r
 679 \r
 680 #endif\r