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                         current = nav.Clone ();\r
  46                 }\r
  47 \r
  48                 XPathNavigator root;\r
  49                 XPathNavigator current;\r
  50                 bool started;\r
  51                 bool closed;\r
  52                 bool endElement;\r
  53                 bool attributeValueConsumed;\r
  54                 StringBuilder readStringBuffer = new StringBuilder ();\r
  55 #if NET_2_0\r
  56                 StringBuilder innerXmlBuilder = new StringBuilder ();\r
  57 #endif\r
  58 \r
  59                 int depth = 0;\r
  60                 int attributeCount = 0;\r
  61                 bool eof;\r
  62 \r
  63                 #region Properties\r
  64 \r
  65 #if NET_2_0\r
  66                 public override bool CanReadBinaryContent {\r
  67                         get { return true; }\r
  68                 }\r
  69 \r
  70                 public override bool CanReadValueChunk {\r
  71                         get { return true; }\r
  72                 }\r
  73 #endif\r
  74 \r
  75                 public override XmlNodeType NodeType {\r
  76                         get {\r
  77                                 if (ReadState != ReadState.Interactive)\r
  78                                         return XmlNodeType.None;\r
  79                                 if (endElement)\r
  80                                         return XmlNodeType.EndElement;\r
  81                                 if (attributeValueConsumed)\r
  82                                         // Is there any way to get other kind of nodes than Text?\r
  83                                         return XmlNodeType.Text;\r
  84 \r
  85                                 switch (current.NodeType) {\r
  86                                 case XPathNodeType.Namespace:\r
  87                                 case XPathNodeType.Attribute:\r
  88                                         return XmlNodeType.Attribute;\r
  89                                 case XPathNodeType.Comment:\r
  90                                         return XmlNodeType.Comment;\r
  91                                 case XPathNodeType.Element:\r
  92                                         return XmlNodeType.Element;\r
  93                                 case XPathNodeType.ProcessingInstruction:\r
  94                                         return XmlNodeType.ProcessingInstruction;\r
  95                                 case XPathNodeType.Root:\r
  96                                         // It is actually Document, but in XmlReader there is no such situation to return Document.\r
  97                                         return XmlNodeType.None;\r
  98                                 case XPathNodeType.SignificantWhitespace:\r
  99                                         return XmlNodeType.SignificantWhitespace;\r
 100                                 case XPathNodeType.Text:\r
 101                                         return XmlNodeType.Text;\r
 102                                 case XPathNodeType.Whitespace:\r
 103                                         return XmlNodeType.Whitespace;\r
 104                                 default:\r
 105                                         throw new InvalidOperationException (String.Format ("Current XPathNavigator status is {0} which is not acceptable to XmlReader.", current.NodeType));\r
 106                                 }\r
 107                         }\r
 108                 }\r
 109 \r
 110                 public override string Name {\r
 111                         get {\r
 112                                 if (ReadState != ReadState.Interactive)\r
 113                                         return String.Empty;\r
 114                                 if (attributeValueConsumed)\r
 115                                         return String.Empty;\r
 116                                 else if (current.NodeType == XPathNodeType.Namespace)\r
 117                                         return current.Name == String.Empty ? "xmlns" : "xmlns:" + current.Name;\r
 118                                 else\r
 119                                         return current.Name;\r
 120                         }\r
 121                 }\r
 122 \r
 123                 public override string LocalName {\r
 124                         get {\r
 125                                 if (ReadState != ReadState.Interactive)\r
 126                                         return String.Empty;\r
 127                                 if (attributeValueConsumed)\r
 128                                         return String.Empty;\r
 129                                 else if (current.NodeType == XPathNodeType.Namespace && current.LocalName == String.Empty)\r
 130                                         return "xmlns";\r
 131                                 else\r
 132                                         return current.LocalName;\r
 133                         }\r
 134                 }\r
 135 \r
 136                 public override string NamespaceURI {\r
 137                         get {\r
 138                                 if (ReadState != ReadState.Interactive)\r
 139                                         return String.Empty;\r
 140                                 if (attributeValueConsumed)\r
 141                                         return String.Empty;\r
 142                                 else if (current.NodeType == XPathNodeType.Namespace)\r
 143                                         return "http://www.w3.org/2000/xmlns/";\r
 144                                 else\r
 145                                         return current.NamespaceURI;\r
 146                         }\r
 147                 }\r
 148 \r
 149                 public override string Prefix {\r
 150                         get {\r
 151                                 if (ReadState != ReadState.Interactive)\r
 152                                         return String.Empty;\r
 153                                 if (attributeValueConsumed)\r
 154                                         return String.Empty;\r
 155                                 else if (current.NodeType == XPathNodeType.Namespace && current.LocalName != String.Empty)\r
 156                                         return "xmlns";\r
 157                                 else\r
 158                                         return current.Prefix;\r
 159                         }\r
 160                 }\r
 161 \r
 162                 public override bool HasValue {\r
 163                         get {\r
 164                                 switch (current.NodeType) {\r
 165                                 case XPathNodeType.Namespace:\r
 166                                 case XPathNodeType.Attribute:\r
 167                                 case XPathNodeType.Comment:\r
 168                                 case XPathNodeType.ProcessingInstruction:\r
 169                                 case XPathNodeType.SignificantWhitespace:\r
 170                                 case XPathNodeType.Text:\r
 171                                 case XPathNodeType.Whitespace:\r
 172                                         return true;\r
 173                                 }\r
 174                                 return false;\r
 175                         }\r
 176                 }\r
 177 \r
 178                 public override int Depth {\r
 179                         get {\r
 180                                 if (ReadState != ReadState.Interactive)\r
 181                                         return 0;\r
 182 \r
 183                                 if (NodeType == XmlNodeType.Attribute)\r
 184                                         return depth + 1;\r
 185                                 if (attributeValueConsumed)\r
 186                                         return depth + 2;\r
 187                                 return depth;\r
 188                         }\r
 189                 }\r
 190 \r
 191                 public override string Value {\r
 192                         get {\r
 193                                 if (ReadState != ReadState.Interactive)\r
 194                                         return String.Empty;\r
 195                                 switch (current.NodeType) {\r
 196                                 case XPathNodeType.Namespace:\r
 197                                 case XPathNodeType.Attribute:\r
 198                                 case XPathNodeType.Comment:\r
 199                                 case XPathNodeType.ProcessingInstruction:\r
 200                                 case XPathNodeType.SignificantWhitespace:\r
 201                                 case XPathNodeType.Text:\r
 202                                 case XPathNodeType.Whitespace:\r
 203                                         return current.Value;\r
 204                                 case XPathNodeType.Element:\r
 205                                 case XPathNodeType.Root:\r
 206                                         return String.Empty;\r
 207                                 default:\r
 208                                         throw new InvalidOperationException ("Current XPathNavigator status is {0} which is not acceptable to XmlReader.");\r
 209                                 }\r
 210                         }\r
 211                 }\r
 212 \r
 213                 public override string BaseURI {\r
 214                         get { return current.BaseURI; }\r
 215                 }\r
 216 \r
 217                 public override bool IsEmptyElement {\r
 218                         get {\r
 219                                 if (ReadState != ReadState.Interactive)\r
 220                                         return false;\r
 221                                 return current.IsEmptyElement;\r
 222                         }\r
 223                 }\r
 224 \r
 225                 public override bool IsDefault {\r
 226                         get {\r
 227 #if NET_2_0\r
 228                                 IXmlSchemaInfo si = current as IXmlSchemaInfo;\r
 229                                 return si != null && si.IsDefault;\r
 230 #else\r
 231                                 return false; // no way to check this.\r
 232 #endif\r
 233                         }\r
 234                 }\r
 235 \r
 236                 // It makes no sense.\r
 237                 public override char QuoteChar {\r
 238                         get { return '\"'; }\r
 239                 }\r
 240 \r
 241 #if NET_2_0\r
 242                 public override IXmlSchemaInfo SchemaInfo {\r
 243                         get { return current.SchemaInfo; }\r
 244                 }\r
 245 #endif\r
 246 \r
 247                 public override string XmlLang {\r
 248                         get { return current.XmlLang; }\r
 249                 }\r
 250 \r
 251                 // It is meaningless.\r
 252                 public override XmlSpace XmlSpace {\r
 253                         get { return XmlSpace.None; }\r
 254                 }\r
 255 \r
 256                 public override int AttributeCount {\r
 257                         get { return attributeCount; }\r
 258                 }\r
 259 \r
 260                 private int GetAttributeCount ()\r
 261                 {\r
 262                         if (ReadState != ReadState.Interactive)\r
 263                                 return 0;\r
 264                         int count = 0;\r
 265                         if (current.MoveToFirstAttribute ()) {\r
 266                                 do {\r
 267                                         count++;\r
 268                                 } while (current.MoveToNextAttribute ());\r
 269                                 current.MoveToParent ();\r
 270                         }\r
 271                         if (current.MoveToFirstNamespace (XPathNamespaceScope.Local)) {\r
 272                                 do {\r
 273                                         count++;\r
 274                                 } while (current.MoveToNextNamespace (XPathNamespaceScope.Local));\r
 275                                 current.MoveToParent ();\r
 276                         }\r
 277                         return count;\r
 278                 }\r
 279                 \r
 280                 /*\r
 281                 private bool MoveToAttributeNavigator (int i)\r
 282                 {\r
 283                         if (ReadState != ReadState.Interactive)\r
 284                                 return false;\r
 285                         switch (current.NodeType) {\r
 286                         case XPathNodeType.Namespace:\r
 287                         case XPathNodeType.Attribute:\r
 288                                 this.MoveToElement ();\r
 289                                 goto case XPathNodeType.Element;\r
 290                         case XPathNodeType.Element:\r
 291                                 int count = 0;\r
 292                                 if (MoveToFirstAttribute ()) {\r
 293                                         if (i == 0)\r
 294                                                 return true;\r
 295                                 }\r
 296                                 for (count++; this.MoveToNextAttribute (); count++) {\r
 297                                         if (count == i)\r
 298                                                 return true;\r
 299                                 }\r
 300                                 break;\r
 301                         }\r
 302                         return false;\r
 303                 }\r
 304 \r
 305                 public override string this [int i] {\r
 306                         get {\r
 307                                 XPathNavigator backup = current.Clone ();\r
 308                                 try {\r
 309                                         if (MoveToAttributeNavigator (i))\r
 310                                                 return Value;\r
 311                                         else\r
 312                                                 throw new ArgumentOutOfRangeException ();\r
 313                                 } finally {\r
 314                                         current.MoveTo (backup);\r
 315                                 }\r
 316                         }\r
 317                 }\r
 318                 */\r
 319 \r
 320                 private void SplitName (string name, out string localName, out string ns)\r
 321                 {\r
 322                         if (name == "xmlns") {\r
 323                                 localName = "xmlns";\r
 324                                 ns = XmlNamespaceManager.XmlnsXmlns;\r
 325                                 return;\r
 326                         }\r
 327                         localName = name;\r
 328                         ns = String.Empty;\r
 329                         int colon = name.IndexOf (':');\r
 330                         if (colon > 0) {\r
 331                                 localName = name.Substring (colon + 1, name.Length - colon - 1);\r
 332                                 ns = this.LookupNamespace (name.Substring (0, colon));\r
 333                                 if (name.Substring (0, colon) == "xmlns")\r
 334                                         ns = XmlNamespaceManager.XmlnsXmlns;\r
 335                         }\r
 336                 }\r
 337 \r
 338                 public override string this [string name] {\r
 339                         get {\r
 340                                 string localName;\r
 341                                 string ns;\r
 342                                 SplitName (name, out localName, out ns);\r
 343                                 return this [localName, ns];\r
 344                         }\r
 345                 }\r
 346 \r
 347                 public override string this [string localName, string namespaceURI] {\r
 348                         get {\r
 349                                 string v = current.GetAttribute (localName, namespaceURI);\r
 350                                 if (v != String.Empty)\r
 351                                         return v;\r
 352                                 XPathNavigator tmp = current.Clone ();\r
 353                                 return tmp.MoveToAttribute (localName, namespaceURI) ? String.Empty : null;\r
 354                         }\r
 355                 }\r
 356 \r
 357                 public override bool EOF {\r
 358                         get { return ReadState == ReadState.EndOfFile; }\r
 359                 }\r
 360 \r
 361                 public override ReadState ReadState {\r
 362                         get {\r
 363                                 if (eof)\r
 364                                         return ReadState.EndOfFile;\r
 365                                 if (closed)\r
 366                                         return ReadState.Closed;\r
 367                                 else if (!started)\r
 368                                         return ReadState.Initial;\r
 369                                 return ReadState.Interactive;\r
 370                         }\r
 371                 }\r
 372 \r
 373                 public override XmlNameTable NameTable {\r
 374                         get { return current.NameTable; }\r
 375                 }\r
 376                 #endregion\r
 377 \r
 378                 #region Methods\r
 379 \r
 380                 public override string GetAttribute (string name)\r
 381                 {\r
 382                         string localName;\r
 383                         string ns;\r
 384                         SplitName (name, out localName, out ns);\r
 385                         return this [localName, ns];\r
 386                 }\r
 387 \r
 388                 public override string GetAttribute (string localName, string namespaceURI)\r
 389                 {\r
 390                         return this [localName, namespaceURI];\r
 391                 }\r
 392 \r
 393                 public override string GetAttribute (int i)\r
 394                 {\r
 395                         return this [i];\r
 396                 }\r
 397 \r
 398                 private bool CheckAttributeMove (bool b)\r
 399                 {\r
 400                         if (b)\r
 401                                 attributeValueConsumed = false;\r
 402                         return b;\r
 403                 }\r
 404 \r
 405                 public override bool MoveToAttribute (string name)\r
 406                 {\r
 407                         string localName;\r
 408                         string ns;\r
 409                         SplitName (name, out localName, out ns);\r
 410                         return MoveToAttribute (localName, ns);\r
 411                 }\r
 412 \r
 413                 public override bool MoveToAttribute (string localName, string namespaceURI)\r
 414                 {\r
 415                         bool isNS = namespaceURI == "http://www.w3.org/2000/xmlns/";\r
 416                         XPathNavigator backup = null;\r
 417                         switch (current.NodeType) {\r
 418                         case XPathNodeType.Namespace:\r
 419                         case XPathNodeType.Attribute:\r
 420                                 backup = current.Clone ();\r
 421                                 this.MoveToElement ();\r
 422                                 goto case XPathNodeType.Element;\r
 423                         case XPathNodeType.Element:\r
 424                                 if (MoveToFirstAttribute ()) {\r
 425                                         do {\r
 426                                                 bool match = false;\r
 427                                                 if (isNS) {\r
 428                                                         if (localName == "xmlns")\r
 429                                                                 match = current.Name == String.Empty;\r
 430                                                         else\r
 431                                                                 match = localName == current.Name;\r
 432                                                 }\r
 433                                                 else\r
 434                                                         match = current.LocalName == localName &&\r
 435                                                                 current.NamespaceURI == namespaceURI;\r
 436                                                 if (match) {\r
 437                                                         attributeValueConsumed = false;\r
 438                                                         return true;\r
 439                                                 }\r
 440                                         } while (MoveToNextAttribute ());\r
 441                                         MoveToElement ();\r
 442                                 }\r
 443                                 break;\r
 444                         }\r
 445                         if (backup != null)\r
 446                                 current = backup;\r
 447                         return false;\r
 448                 }\r
 449 \r
 450                 public override bool MoveToFirstAttribute ()\r
 451                 {\r
 452                         switch (current.NodeType) {\r
 453                         case XPathNodeType.Element:\r
 454                                 if (CheckAttributeMove (current.MoveToFirstNamespace (XPathNamespaceScope.Local)))\r
 455                                         return true;\r
 456                                 return CheckAttributeMove (current.MoveToFirstAttribute ());\r
 457                         case XPathNodeType.Namespace:\r
 458                         case XPathNodeType.Attribute:\r
 459                                 current.MoveToParent ();\r
 460                                 goto case XPathNodeType.Element;\r
 461                         default:\r
 462                                 return false;\r
 463                         }\r
 464                 }\r
 465 \r
 466                 public override bool MoveToNextAttribute ()\r
 467                 {\r
 468                         switch (current.NodeType) {\r
 469                         case XPathNodeType.Element:\r
 470                                 return MoveToFirstAttribute ();\r
 471                         case XPathNodeType.Namespace:\r
 472                                 if (CheckAttributeMove (current.MoveToNextNamespace (XPathNamespaceScope.Local)))\r
 473                                         return true;\r
 474                                 XPathNavigator bak = current.Clone ();\r
 475                                 current.MoveToParent ();\r
 476                                 if (CheckAttributeMove (current.MoveToFirstAttribute ()))\r
 477                                         return true;\r
 478                                 current.MoveTo (bak);\r
 479                                 return false;\r
 480                         case XPathNodeType.Attribute:\r
 481                                 return CheckAttributeMove (current.MoveToNextAttribute ());\r
 482                         default:\r
 483                                 return false;\r
 484                         }\r
 485                 }\r
 486 \r
 487                 public override bool MoveToElement ()\r
 488                 {\r
 489                         if (current.NodeType == XPathNodeType.Attribute ||\r
 490                                 current.NodeType == XPathNodeType.Namespace) {\r
 491                                 attributeValueConsumed = false;\r
 492                                 return current.MoveToParent ();\r
 493                         }\r
 494                         return false;\r
 495                 }\r
 496 \r
 497                 public override void Close ()\r
 498                 {\r
 499                         closed = true;\r
 500                         eof = true;\r
 501                 }\r
 502 \r
 503                 public override bool Read ()\r
 504                 {\r
 505                         if (eof)\r
 506                                 return false;\r
 507 #if NET_2_0\r
 508                         if (Binary != null)\r
 509                                 Binary.Reset ();\r
 510 #endif\r
 511 \r
 512                         switch (ReadState) {\r
 513                         case ReadState.Interactive:\r
 514                                 if ((IsEmptyElement || endElement) && root.IsSamePosition (current)) {\r
 515                                         eof = true;\r
 516                                         return false;\r
 517                                 }\r
 518                                 break;\r
 519                         case ReadState.EndOfFile:\r
 520                         case ReadState.Closed:\r
 521                         case ReadState.Error:\r
 522                                 return false;\r
 523                         case ReadState.Initial:\r
 524                                 started = true;\r
 525                                 root = current.Clone ();\r
 526                                 if (current.NodeType == XPathNodeType.Root &&\r
 527                                         !current.MoveToFirstChild ()) {\r
 528                                         endElement = false;\r
 529                                         eof = true;\r
 530                                         return false;\r
 531                                 }\r
 532                                 attributeCount = GetAttributeCount ();\r
 533                                 return true;\r
 534                         }\r
 535 \r
 536                         MoveToElement ();\r
 537 \r
 538                         if (endElement || !current.MoveToFirstChild ()) {\r
 539                                 // EndElement of current element.\r
 540                                 if (!endElement && !current.IsEmptyElement &&\r
 541                                         current.NodeType == XPathNodeType.Element)\r
 542                                         endElement = true;\r
 543                                 else if (!current.MoveToNext ()) {\r
 544                                         current.MoveToParent ();\r
 545                                         if (current.NodeType == XPathNodeType.Root) {\r
 546                                                 endElement = false;\r
 547                                                 eof = true;\r
 548                                                 return false;\r
 549                                         }\r
 550                                         endElement = (current.NodeType == XPathNodeType.Element);\r
 551                                         if (endElement)\r
 552                                                 depth--;\r
 553                                 }\r
 554                                 else\r
 555                                         endElement = false;\r
 556                         }\r
 557                         else\r
 558                                 depth++;\r
 559 \r
 560                         if (!endElement && current.NodeType == XPathNodeType.Element)\r
 561                                 attributeCount = GetAttributeCount ();\r
 562                         else\r
 563                                 attributeCount = 0;\r
 564 \r
 565                         return true;\r
 566                 }\r
 567 \r
 568                 public override string ReadString ()\r
 569                 {\r
 570                         readStringBuffer.Length = 0;\r
 571 \r
 572                         switch (NodeType) {\r
 573                         default:\r
 574                                 return String.Empty;\r
 575                         case XmlNodeType.Element:\r
 576                                 if (IsEmptyElement)\r
 577                                         return String.Empty;\r
 578                                 do {\r
 579                                         Read ();\r
 580                                         switch (NodeType) {\r
 581                                         case XmlNodeType.Text:\r
 582                                         case XmlNodeType.CDATA:\r
 583                                         case XmlNodeType.Whitespace:\r
 584                                         case XmlNodeType.SignificantWhitespace:\r
 585                                                 readStringBuffer.Append (Value);\r
 586                                                 continue;\r
 587                                         }\r
 588                                         break;\r
 589                                 } while (true);\r
 590                                 break;\r
 591                         case XmlNodeType.Text:\r
 592                         case XmlNodeType.CDATA:\r
 593                         case XmlNodeType.Whitespace:\r
 594                         case XmlNodeType.SignificantWhitespace:\r
 595                                 do {\r
 596                                         switch (NodeType) {\r
 597                                         case XmlNodeType.Text:\r
 598                                         case XmlNodeType.CDATA:\r
 599                                         case XmlNodeType.Whitespace:\r
 600                                         case XmlNodeType.SignificantWhitespace:\r
 601                                                 readStringBuffer.Append (Value);\r
 602                                                 Read ();\r
 603                                                 continue;\r
 604                                         }\r
 605                                         break;\r
 606                                 } while (true);\r
 607                                 break;\r
 608                         }\r
 609                         string ret = readStringBuffer.ToString ();\r
 610                         readStringBuffer.Length = 0;\r
 611                         return ret;\r
 612                 }\r
 613 \r
 614 #if NET_1_1\r
 615 #else\r
 616                 public override string ReadInnerXml ()\r
 617                 {\r
 618                         if (ReadState != ReadState.Interactive)\r
 619                                 return String.Empty;\r
 620 \r
 621                         switch (NodeType) {\r
 622                         case XmlNodeType.Attribute:\r
 623                                 return Value;\r
 624                         case XmlNodeType.Element:\r
 625                                 if (IsEmptyElement)\r
 626                                         return String.Empty;\r
 627 \r
 628                                 int startDepth = Depth;\r
 629 \r
 630                                 innerXmlBuilder.Length = 0;\r
 631                                 bool loop = true;\r
 632                                 do {\r
 633                                         Read ();\r
 634                                         if (NodeType ==XmlNodeType.None)\r
 635                                                 throw new InvalidOperationException ("unexpected end of xml.");\r
 636                                         else if (NodeType == XmlNodeType.EndElement && Depth == startDepth) {\r
 637                                                 loop = false;\r
 638                                                 Read ();\r
 639                                         }\r
 640                                         else\r
 641                                                 innerXmlBuilder.Append (GetCurrentTagMarkup ());\r
 642                                 } while (loop);\r
 643                                 string xml = innerXmlBuilder.ToString ();\r
 644                                 innerXmlBuilder.Length = 0;\r
 645                                 return xml;\r
 646                         case XmlNodeType.None:\r
 647                                 // MS document is incorrect. Seems not to progress.\r
 648                                 return String.Empty;\r
 649                         default:\r
 650                                 Read ();\r
 651                                 return String.Empty;\r
 652                         }\r
 653                 }\r
 654                 \r
 655                 StringBuilder atts = new StringBuilder ();\r
 656                 private string GetCurrentTagMarkup ()\r
 657                 {\r
 658                         switch (NodeType) {\r
 659                         case XmlNodeType.CDATA:\r
 660                                 return String.Format ("<![CDATA[{0}]]>", Value.Replace ("]]>", "]]&gt;"));\r
 661                         case XmlNodeType.Text:\r
 662                                 return Value.Replace ("<", "&lt;");\r
 663                         case XmlNodeType.Comment:\r
 664                                 return String.Format ("<!--{0}-->", Value);\r
 665                         case XmlNodeType.SignificantWhitespace:\r
 666                         case XmlNodeType.Whitespace:\r
 667                                 return Value;\r
 668                         case XmlNodeType.EndElement:\r
 669                                 return String.Format ("</{0}>", Name);\r
 670                         }\r
 671 \r
 672                         bool isEmpty = IsEmptyElement;\r
 673                         string name = Name;\r
 674                         atts.Length = 0;\r
 675                         XPathNavigator temp = current.Clone ();\r
 676                         while (temp.MoveToNextAttribute ())\r
 677                                 atts.AppendFormat (" {0}='{1}'", temp.Name, temp.Value.Replace ("'", "&apos;"));\r
 678                         if (!IsEmptyElement)\r
 679                                 return String.Format ("<{0}{1}>", name, atts);\r
 680                         else\r
 681                                 return String.Format ("<{0}{1} />", name, atts);\r
 682                 }\r
 683 \r
 684                 // Arranged copy of XmlTextReader.ReadOuterXml()\r
 685                 public override string ReadOuterXml ()\r
 686                 {\r
 687                         if (ReadState != ReadState.Interactive)\r
 688                                 return String.Empty;\r
 689 \r
 690                         switch (NodeType) {\r
 691                         case XmlNodeType.Attribute:\r
 692                                 // strictly incompatible with MS... (it holds spaces attribute between name, value and "=" char (very trivial).\r
 693                                 return String.Format ("{0}={1}{2}{1}", Name, QuoteChar, ReadInnerXml ());\r
 694                         case XmlNodeType.Element:\r
 695                                 bool isEmpty = IsEmptyElement;\r
 696                                 string name = Name;\r
 697                                 StringBuilder atts = new StringBuilder ();\r
 698                                 XPathNavigator temp = current.Clone ();\r
 699                                 while (temp.MoveToNextAttribute ())\r
 700                                         atts.AppendFormat (" {0}='{1}'", temp.Name, temp.Value.Replace ("'", "&apos;"));\r
 701 \r
 702                                 if (!isEmpty)\r
 703                                         return String.Format ("{0}{1}</{2}>", GetCurrentTagMarkup (), atts, ReadInnerXml (), name);\r
 704                                 else\r
 705                                         return String.Format ("{0}", GetCurrentTagMarkup ());\r
 706                         case XmlNodeType.None:\r
 707                                 // MS document is incorrect. Seems not to progress.\r
 708                                 return String.Empty;\r
 709                         default:\r
 710                                 Read ();\r
 711                                 return String.Empty;\r
 712                         }\r
 713                 }\r
 714 #endif\r
 715 \r
 716                 public override string LookupNamespace (string prefix)\r
 717                 {\r
 718                         XPathNavigator backup = current.Clone ();\r
 719                         try {\r
 720                                 this.MoveToElement ();\r
 721                                 if (current.NodeType != XPathNodeType.Element) // text etc.\r
 722                                         current.MoveToParent ();\r
 723                                 if (current.MoveToFirstNamespace ()) {\r
 724                                         do {\r
 725                                                 if (current.LocalName == prefix)\r
 726                                                         return current.Value;\r
 727                                         } while (current.MoveToNextNamespace ());\r
 728                                 }\r
 729                                 return null;\r
 730                         } finally {\r
 731                                 current = backup;\r
 732                         }\r
 733                 }\r
 734 \r
 735                 // It does not support entity resolution.\r
 736                 public override void ResolveEntity ()\r
 737                 {\r
 738                         throw new InvalidOperationException ();\r
 739                 }\r
 740 \r
 741                 public override bool ReadAttributeValue () {\r
 742                         if (NodeType != XmlNodeType.Attribute)\r
 743                                 return false;\r
 744                         if (attributeValueConsumed)\r
 745                                 return false;\r
 746                         attributeValueConsumed = true;\r
 747                         return true;\r
 748                 }\r
 749                 #endregion\r
 750         }\r
 751 }\r
 752 \r
 753 #endif\r