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