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

   1 //
   2 // System.Xml.XmlConvert
   3 //
   4 // Authors:
   5 //      Dwivedi, Ajay kumar (Adwiv@Yahoo.com)
   6 //      Gonzalo Paniagua Javier (gonzalo@ximian.com)
   7 //      Alan Tam Siu Lung (Tam@SiuLung.com)
   8 //      Atsushi Enomoto (ginga@kit.hi-ho.ne.jp)
   9 //
  10 // (C) 2002 Ximian, Inc (http://www.ximian.com)
  11 //
  12
  13 //
  14 // Permission is hereby granted, free of charge, to any person obtaining
  15 // a copy of this software and associated documentation files (the
  16 // "Software"), to deal in the Software without restriction, including
  17 // without limitation the rights to use, copy, modify, merge, publish,
  18 // distribute, sublicense, and/or sell copies of the Software, and to
  19 // permit persons to whom the Software is furnished to do so, subject to
  20 // the following conditions:
  21 //
  22 // The above copyright notice and this permission notice shall be
  23 // included in all copies or substantial portions of the Software.
  24 //
  25 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  26 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  27 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  28 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  29 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  30 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  31 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  32 //
  33 using System;
  34 using System.IO;
  35 using System.Text;
  36 using System.Globalization;
  37 using System.Xml.Schema;
  38
  39 namespace System.Xml {
  40
  41         public class XmlConvert {
  42
  43                 const string encodedColon = "_x003A_";
  44                 const NumberStyles floatStyle = NumberStyles.AllowCurrencySymbol |
  45                         NumberStyles.AllowExponent |
  46                         NumberStyles.AllowDecimalPoint |
  47                         NumberStyles.AllowLeadingSign |
  48                         NumberStyles.AllowLeadingWhite |
  49                         NumberStyles.AllowTrailingWhite;
  50
  51                 const NumberStyles integerStyle = NumberStyles.Integer |
  52                         NumberStyles.AllowLeadingWhite |
  53                         NumberStyles.AllowTrailingWhite;
  54
  55                 static readonly string [] datetimeFormats = {
  56                   // dateTime
  57 #if NET_2_0
  58                   "yyyy-MM-ddTHH:mm:sszzz",
  59                   "yyyy-MM-ddTHH:mm:ss.FFFFFFFzzz",
  60                   "yyyy-MM-ddTHH:mm:ssZ",
  61                   "yyyy-MM-ddTHH:mm:ss.FFFFFFFZ",
  62                   "yyyy-MM-ddTHH:mm:ss",
  63                   "yyyy-MM-ddTHH:mm:ss.FFFFFFF",
  64                   "HH:mm:ss",
  65                   "HH:mm:ss.FFFFFFF",
  66                   "HH:mm:sszzz",
  67                   "HH:mm:ss.FFFFFFFzzz",
  68                   "HH:mm:ssZ",
  69                   "HH:mm:ss.FFFFFFFZ",
  70 #else // it is not required in trunk but should make it easy to backport...
  71                   "yyyy-MM-ddTHH:mm:sszzz",
  72                   "yyyy-MM-ddTHH:mm:ss.fzzz",
  73                   "yyyy-MM-ddTHH:mm:ss.ffzzz",
  74                   "yyyy-MM-ddTHH:mm:ss.fffzzz",
  75                   "yyyy-MM-ddTHH:mm:ss.ffffzzz",
  76                   "yyyy-MM-ddTHH:mm:ss.fffffzzz",
  77                   "yyyy-MM-ddTHH:mm:ss.ffffffzzz",
  78                   "yyyy-MM-ddTHH:mm:ss.fffffffzzz",
  79                   "yyyy-MM-ddTHH:mm:ssZ",
  80                   "yyyy-MM-ddTHH:mm:ss.fZ",
  81                   "yyyy-MM-ddTHH:mm:ss.ffZ",
  82                   "yyyy-MM-ddTHH:mm:ss.fffZ",
  83                   "yyyy-MM-ddTHH:mm:ss.ffffZ",
  84                   "yyyy-MM-ddTHH:mm:ss.fffffZ",
  85                   "yyyy-MM-ddTHH:mm:ss.ffffffZ",
  86                   "yyyy-MM-ddTHH:mm:ss.fffffffZ",
  87                   "yyyy-MM-ddTHH:mm:ss",
  88                   "yyyy-MM-ddTHH:mm:ss.f",
  89                   "yyyy-MM-ddTHH:mm:ss.ff",
  90                   "yyyy-MM-ddTHH:mm:ss.fff",
  91                   "yyyy-MM-ddTHH:mm:ss.ffff",
  92                   "yyyy-MM-ddTHH:mm:ss.fffff",
  93                   "yyyy-MM-ddTHH:mm:ss.ffffff",
  94                   "yyyy-MM-ddTHH:mm:ss.fffffff",
  95                   // time
  96                   "HH:mm:ss",
  97                   "HH:mm:ss.f",
  98                   "HH:mm:ss.ff",
  99                   "HH:mm:ss.fff",
 100                   "HH:mm:ss.ffff",
 101                   "HH:mm:ss.fffff",
 102                   "HH:mm:ss.ffffff",
 103                   "HH:mm:ss.fffffff",
 104                   "HH:mm:sszzz",
 105                   "HH:mm:ss.fzzz",
 106                   "HH:mm:ss.ffzzz",
 107                   "HH:mm:ss.fffzzz",
 108                   "HH:mm:ss.ffffzzz",
 109                   "HH:mm:ss.fffffzzz",
 110                   "HH:mm:ss.ffffffzzz",
 111                   "HH:mm:ss.fffffffzzz",
 112                   "HH:mm:ssZ",
 113                   "HH:mm:ss.fZ",
 114                   "HH:mm:ss.ffZ",
 115                   "HH:mm:ss.fffZ",
 116                   "HH:mm:ss.ffffZ",
 117                   "HH:mm:ss.fffffZ",
 118                   "HH:mm:ss.ffffffZ",
 119                   "HH:mm:ss.fffffffZ",
 120 #endif
 121                   // date
 122                   "yyyy-MM-dd",
 123                   "yyyy-MM-ddzzz",
 124                   "yyyy-MM-ddZ",
 125                   // gYearMonth
 126                   "yyyy-MM",
 127                   "yyyy-MMzzz",
 128                   "yyyy-MMZ",
 129                   // gYear
 130                   "yyyy",
 131                   "yyyyzzz",
 132                   "yyyyZ",
 133                   // gMonthDay
 134                   "--MM-dd",
 135                   "--MM-ddzzz",
 136                   "--MM-ddZ",
 137                   // gDay
 138                   "---dd",
 139                   "---ddzzz",
 140                   "---ddZ",
 141                 };
 142
 143 #if NET_2_0
 144                 static readonly string [] defaultDateTimeFormats = new string [] {
 145                         "yyyy-MM-ddTHH:mm:ss", // dateTime(1)
 146                         "yyyy-MM-ddTHH:mm:ss.FFFFFFF", // dateTime(2)
 147                         "yyyy-MM-dd", // date
 148                         "HH:mm:ss", // time
 149                         "yyyy-MM", // gYearMonth
 150                         "yyyy", // gYear
 151                         "--MM-dd", // gMonthDay
 152                         "---dd", // gDay
 153                         };
 154
 155                 static readonly string [] roundtripDateTimeFormats;
 156                 static readonly string [] localDateTimeFormats;
 157                 static readonly string [] utcDateTimeFormats;
 158                 static readonly string [] unspecifiedDateTimeFormats;
 159
 160                 static XmlConvert ()
 161                 {
 162                         int l = defaultDateTimeFormats.Length;
 163                         roundtripDateTimeFormats = new string [l];
 164                         localDateTimeFormats = new string [l];
 165                         utcDateTimeFormats = new string [l * 3];
 166                         unspecifiedDateTimeFormats = new string [l * 4];
 167                         for (int i = 0; i < l; i++) {
 168                                 string s = defaultDateTimeFormats [i];
 169                                 localDateTimeFormats [i] = s + "zzz";
 170                                 roundtripDateTimeFormats [i] = s + 'K';
 171                                 utcDateTimeFormats [i * 3] = s;
 172                                 utcDateTimeFormats [i * 3 + 1] = s + 'Z';
 173                                 utcDateTimeFormats [i * 3 + 2] = s + "zzz";
 174                                 unspecifiedDateTimeFormats [i * 4] = s;
 175                                 unspecifiedDateTimeFormats [i * 4 + 1] = localDateTimeFormats [i];
 176                                 unspecifiedDateTimeFormats [i * 4 + 2] = roundtripDateTimeFormats [i];
 177                                 unspecifiedDateTimeFormats [i * 4 + 3] = utcDateTimeFormats [i];
 178                         }
 179                 }
 180 #endif
 181                 static DateTimeStyles _defaultStyle = DateTimeStyles.AllowLeadingWhite | DateTimeStyles.AllowTrailingWhite;
 182
 183                 public XmlConvert()
 184                 {}
 185
 186                 private static string TryDecoding (string s)
 187                 {
 188                         if (s == null || s.Length < 6)
 189                                 return s;
 190
 191                         char c = '\uFFFF';
 192                         try {
 193                                 c = (char) Int32.Parse (s.Substring (1, 4), NumberStyles.HexNumber, CultureInfo.InvariantCulture);
 194                         } catch {
 195                                 return s [0] + DecodeName (s.Substring (1));
 196                         }
 197
 198                         if (s.Length == 6)
 199                                 return c.ToString ();
 200                         return c + DecodeName (s.Substring (6));
 201                 }
 202
 203                 public static string DecodeName (string name)
 204                 {
 205                         if (name == null || name.Length == 0)
 206                                 return name;
 207
 208                         int pos = name.IndexOf ('_');
 209                         if (pos == -1 || pos + 6 >= name.Length)
 210                                 return name;
 211
 212                         if ((name [pos + 1] != 'X' && name [pos + 1] != 'x') || name [pos + 6] != '_')
 213                                 return name [0] + DecodeName (name.Substring (1));
 214
 215                         return name.Substring (0, pos) + TryDecoding (name.Substring (pos + 1));
 216                 }
 217
 218                 public static string EncodeLocalName (string name)
 219                 {
 220                         if (name == null)
 221                                 return name;
 222
 223                         string encoded = EncodeName (name);
 224                         int pos = encoded.IndexOf (':');
 225                         if (pos == -1)
 226                                 return encoded;
 227                         return encoded.Replace (":", encodedColon);
 228                 }
 229
 230                 internal static bool IsInvalid (char c, bool firstOnlyLetter)
 231                 {
 232                         if (c == ':') // Special case. allowed in EncodeName, but encoded in EncodeLocalName
 233                                 return false;
 234
 235                         if (firstOnlyLetter)
 236                                 return !XmlChar.IsFirstNameChar (c);
 237                         else
 238                                 return !XmlChar.IsNameChar (c);
 239                 }
 240
 241                 private static string EncodeName (string name, bool nmtoken)
 242                 {
 243                         if (name == null || name.Length == 0)
 244                                 return name;
 245
 246                         StringBuilder sb = new StringBuilder ();
 247                         int length = name.Length;
 248                         for (int i = 0; i < length; i++) {
 249                                 char c = name [i];
 250                                 if (IsInvalid (c, i == 0 && !nmtoken))
 251                                         sb.AppendFormat ("_x{0:X4}_", (int) c);
 252                                 else if (c == '_' && i + 6 < length && name [i+1] == 'x' && name [i + 6] == '_')
 253                                         sb.Append ("_x005F_");
 254                                 else
 255                                         sb.Append (c);
 256                         }
 257                         return sb.ToString ();
 258                 }
 259
 260                 public static string EncodeName (string name)
 261                 {
 262                         return EncodeName (name, false);
 263                 }
 264
 265                 public static string EncodeNmToken (string name)
 266                 {
 267                         if (name == String.Empty)
 268                                 throw new XmlException ("Invalid NmToken: ''");
 269                         return EncodeName (name, true);
 270                 }
 271
 272                 // {true, false, 1, 0}
 273                 public static bool ToBoolean(string s)
 274                 {
 275                         s = s.Trim (XmlChar.WhitespaceChars);
 276                         switch(s)
 277                         {
 278                                 case "1":
 279                                         return true;
 280                                 case "true":
 281                                         return true;
 282                                 case "0":
 283                                         return false;
 284                                 case "false":
 285                                         return false;
 286                                 default:
 287                                         throw new FormatException(s + " is not a valid boolean value");
 288                         }
 289                 }
 290
 291                 // LAMESPEC: It has been documented as public, but is marked as internal.
 292                 internal static string ToBinHexString (byte [] buffer)
 293                 {
 294                         StringWriter w = new StringWriter ();
 295                         WriteBinHex (buffer, 0, buffer.Length, w);
 296                         return w.ToString ();
 297                 }
 298
 299                 internal static void WriteBinHex (byte [] buffer, int index, int count, TextWriter w)
 300                 {
 301                         if (buffer == null)
 302                                 throw new ArgumentNullException ("buffer");
 303                         if (index < 0) {
 304                                 throw new ArgumentOutOfRangeException (
 305 #if !NET_2_1
 306                                         "index", index,
 307 #endif
 308                                         "index must be non negative integer.");
 309                         }
 310                         if (count < 0) {
 311                                 throw new ArgumentOutOfRangeException (
 312 #if !NET_2_1
 313                                         "count", count,
 314 #endif
 315                                         "count must be non negative integer.");
 316                         }
 317                         if (buffer.Length < index + count)
 318                                 throw new ArgumentOutOfRangeException ("index and count must be smaller than the length of the buffer.");
 319
 320                         // Copied from XmlTextWriter.WriteBinHex ()
 321                         int end = index + count;
 322                         for (int i = index; i < end; i++) {
 323                                 int val = buffer [i];
 324                                 int high = val >> 4;
 325                                 int low = val & 15;
 326                                 if (high > 9)
 327                                         w.Write ((char) (high + 55));
 328                                 else
 329                                         w.Write ((char) (high + 0x30));
 330                                 if (low > 9)
 331                                         w.Write ((char) (low + 55));
 332                                 else
 333                                         w.Write ((char) (low + 0x30));
 334                         }
 335                 }
 336
 337                 public static byte ToByte(string s)
 338                 {
 339                         return Byte.Parse(s, NumberStyles.Integer, CultureInfo.InvariantCulture);
 340                 }
 341
 342                 public static char ToChar(string s)
 343                 {
 344 #if !NET_2_1
 345                         return Char.Parse(s);
 346 #else
 347                         if (s == null)
 348                                 throw new ArgumentNullException ("s");
 349
 350                         if (s.Length != 1)
 351                                 throw new FormatException ("String contain more than one char");
 352
 353                         return s [0];
 354 #endif
 355                 }
 356
 357 #if NET_2_0
 358                 [Obsolete]
 359 #endif
 360                 public static DateTime ToDateTime (string s)
 361                 {
 362                         return ToDateTime (s, datetimeFormats);
 363                 }
 364
 365 #if NET_2_0
 366                 public static DateTime ToDateTime (string value, XmlDateTimeSerializationMode mode)
 367                 {
 368                         DateTime dt;
 369                         switch (mode) {
 370                         case XmlDateTimeSerializationMode.Local:
 371                                 dt = ToDateTime (value, localDateTimeFormats);
 372                                 return dt == DateTime.MinValue || dt == DateTime.MaxValue ? dt : dt.ToLocalTime ();
 373                         case XmlDateTimeSerializationMode.RoundtripKind:
 374                                 return ToDateTime (value, roundtripDateTimeFormats, _defaultStyle | DateTimeStyles.RoundtripKind);
 375                         case XmlDateTimeSerializationMode.Utc:
 376                                 dt = ToDateTime (value, utcDateTimeFormats);
 377                                 return dt == DateTime.MinValue || dt == DateTime.MaxValue ? dt : dt.ToUniversalTime ();
 378                         case XmlDateTimeSerializationMode.Unspecified:
 379                                 return ToDateTime (value, unspecifiedDateTimeFormats);
 380                         default:
 381                                 return ToDateTime (value, defaultDateTimeFormats);
 382                         }
 383                 }
 384 #endif
 385                 public static DateTime ToDateTime(string s, string format)
 386                 {
 387                         //DateTimeFormatInfo d = new DateTimeFormatInfo();
 388                         //d.FullDateTimePattern = format;
 389                         //return DateTime.Parse(s, d);
 390                         DateTimeStyles style = DateTimeStyles.AllowLeadingWhite |
 391                                                DateTimeStyles.AllowTrailingWhite;
 392                         return DateTime.ParseExact (s, format, DateTimeFormatInfo.InvariantInfo, style);
 393                 }
 394
 395                 public static DateTime ToDateTime(string s, string[] formats)
 396                 {
 397                         return ToDateTime (s, formats, _defaultStyle);
 398                 }
 399
 400                 private static DateTime ToDateTime (string s, string [] formats, DateTimeStyles style)
 401                 {
 402                         return DateTime.ParseExact (s, formats, DateTimeFormatInfo.InvariantInfo, style);
 403                 }
 404
 405                 public static Decimal ToDecimal(string s)
 406                 {
 407                         return Decimal.Parse(s, CultureInfo.InvariantCulture);
 408                 }
 409
 410                 public static double ToDouble(string s)
 411                 {
 412                         if (s == null)
 413                                 throw new ArgumentNullException();
 414
 415                         float f = TryParseStringFloatConstants (s);
 416                         if (f != 0)
 417                                 return f;
 418
 419                         return Double.Parse (s, floatStyle, CultureInfo.InvariantCulture);
 420                 }
 421
 422                 static float TryParseStringFloatConstants (string s)
 423                 {
 424                         int sidx = 0;
 425                         while (sidx < s.Length && Char.IsWhiteSpace (s [sidx]))
 426                                 sidx++;
 427                         if (sidx == s.Length)
 428                                 throw new FormatException ();
 429                         int sEndPos = s.Length - 1;
 430                         while (Char.IsWhiteSpace (s [sEndPos]))
 431                                 sEndPos--;
 432
 433                         if (TryParseStringConstant ("NaN", s, sidx, sEndPos))
 434                                 return Single.NaN;
 435                         if (TryParseStringConstant ("INF", s, sidx, sEndPos))
 436                                 return Single.PositiveInfinity;
 437                         if (TryParseStringConstant ("-INF", s, sidx, sEndPos))
 438                                 return Single.NegativeInfinity;
 439                         // Handle these here because Single.Parse("Infinity") is invalid while XmlConvert.ToSingle("Infinity") is valid.
 440                         if (TryParseStringConstant ("Infinity", s, sidx, sEndPos))
 441                                 return Single.PositiveInfinity;
 442                         if (TryParseStringConstant ("-Infinity", s, sidx, sEndPos))
 443                                 return Single.NegativeInfinity;
 444                         return 0;
 445                 }
 446
 447                 static bool TryParseStringConstant (string format, string s, int start, int end)
 448                 {
 449                         return end - start + 1 == format.Length && String.CompareOrdinal (format, 0, s, start, format.Length) == 0;
 450                 }
 451
 452                 public static Guid ToGuid (string s)
 453                 {
 454                         try {
 455                                 return new Guid(s);
 456                         } catch (FormatException ex) {
 457                                 throw new FormatException (String.Format ("Invalid Guid input '{0}'", ex.InnerException));
 458                         }
 459                 }
 460
 461                 public static short ToInt16(string s)
 462                 {
 463                         return Int16.Parse (s, integerStyle, CultureInfo.InvariantCulture);
 464                 }
 465
 466                 public static int ToInt32(string s)
 467                 {
 468                         return Int32.Parse (s, integerStyle, CultureInfo.InvariantCulture);
 469                 }
 470
 471                 public static long ToInt64(string s)
 472                 {
 473                         return Int64.Parse (s, integerStyle, CultureInfo.InvariantCulture);
 474                 }
 475
 476                 [CLSCompliant (false)]
 477                 public static SByte ToSByte(string s)
 478                 {
 479                         return SByte.Parse(s, integerStyle, CultureInfo.InvariantCulture);
 480                 }
 481
 482                 public static float ToSingle(string s)
 483                 {
 484                         if (s == null)
 485                                 throw new ArgumentNullException();
 486
 487                         float f = TryParseStringFloatConstants (s);
 488                         if (f != 0)
 489                                 return f;
 490
 491                         return Single.Parse(s, floatStyle, CultureInfo.InvariantCulture);
 492                 }
 493
 494                 public static string ToString(Guid value)
 495                 {
 496                         return value.ToString("D", CultureInfo.InvariantCulture);
 497                 }
 498
 499                 public static string ToString(int value)
 500                 {
 501                         return value.ToString(CultureInfo.InvariantCulture);
 502                 }
 503
 504                 public static string ToString(short value)
 505                 {
 506                         return value.ToString(CultureInfo.InvariantCulture);
 507                 }
 508
 509                 public static string ToString(byte value)
 510                 {
 511                         return value.ToString(CultureInfo.InvariantCulture);
 512                 }
 513
 514                 public static string ToString(long value)
 515                 {
 516                         return value.ToString(CultureInfo.InvariantCulture);
 517                 }
 518
 519                 public static string ToString(char value)
 520                 {
 521                         return value.ToString(CultureInfo.InvariantCulture);
 522                 }
 523
 524                 public static string ToString(bool value)
 525                 {
 526                         if (value) return "true";
 527                         return "false";
 528                 }
 529
 530                 [CLSCompliant (false)]
 531                 public static string ToString(SByte value)
 532                 {
 533                         return value.ToString(CultureInfo.InvariantCulture);
 534                 }
 535
 536                 public static string ToString(Decimal value)
 537                 {
 538                         return value.ToString (CultureInfo.InvariantCulture);
 539                 }
 540
 541                 [CLSCompliant (false)]
 542                 public static string ToString(UInt64 value)
 543                 {
 544                         return value.ToString(CultureInfo.InvariantCulture);
 545                 }
 546
 547                 public static string ToString (TimeSpan value)
 548                 {
 549                         if (value == TimeSpan.Zero)
 550                                 return "PT0S";
 551
 552                         StringBuilder builder = new StringBuilder ();
 553                         if (value.Ticks < 0) {
 554                                 builder.Append ('-');
 555                                 value = value.Negate ();
 556                         }
 557                         builder.Append ('P');
 558                         if (value.Days > 0)
 559                                 builder.Append (value.Days).Append ('D');
 560                         long ticks = value.Ticks % TimeSpan.TicksPerMillisecond;
 561                         if (value.Days > 0 || value.Hours > 0 || value.Minutes > 0 || value.Seconds > 0 || value.Milliseconds > 0 || ticks > 0) {
 562                                 builder.Append('T');
 563                                 if (value.Hours > 0)
 564                                         builder.Append (value.Hours).Append ('H');
 565                                 if (value.Minutes > 0)
 566                                         builder.Append (value.Minutes).Append ('M');
 567                                 if (value.Seconds > 0 || value.Milliseconds > 0 || ticks > 0) {
 568                                         builder.Append (value.Seconds);
 569                                         bool trimZero = true;
 570                                         if (ticks > 0)
 571                                                 builder.Append ('.').AppendFormat ("{0:0000000}", value.Ticks % TimeSpan.TicksPerSecond);
 572                                         else if (value.Milliseconds > 0)
 573                                                 builder.Append ('.').AppendFormat ("{0:000}", value.Milliseconds);
 574                                         else
 575                                                 trimZero = false;
 576                                         if (trimZero)
 577                                                 while (builder [builder.Length - 1] == '0')
 578                                                         builder.Remove (builder.Length - 1, 1);
 579
 580                                         builder.Append ('S');
 581                                 }
 582                         }
 583                         return builder.ToString ();
 584                 }
 585
 586                 public static string ToString(double value)
 587                 {
 588                         if (Double.IsNegativeInfinity(value)) return "-INF";
 589                         if (Double.IsPositiveInfinity(value)) return "INF";
 590                         if (Double.IsNaN(value)) return "NaN";
 591                         return value.ToString("R", CultureInfo.InvariantCulture);
 592                 }
 593
 594                 public static string ToString(float value)
 595                 {
 596                         if (Single.IsNegativeInfinity(value)) return "-INF";
 597                         if (Single.IsPositiveInfinity(value)) return "INF";
 598                         if (Single.IsNaN(value)) return "NaN";
 599                         return value.ToString("R", CultureInfo.InvariantCulture);
 600                 }
 601
 602                 [CLSCompliant (false)]
 603                 public static string ToString(UInt32 value)
 604                 {
 605                         return value.ToString(CultureInfo.InvariantCulture);
 606                 }
 607
 608                 [CLSCompliant (false)]
 609                 public static string ToString(UInt16 value)
 610                 {
 611                         return value.ToString(CultureInfo.InvariantCulture);
 612                 }
 613
 614 #if NET_2_0
 615                 [Obsolete]
 616 #endif
 617                 public static string ToString (DateTime value)
 618                 {
 619                         return value.ToString ("yyyy-MM-ddTHH:mm:ss.fffffffzzz", CultureInfo.InvariantCulture);
 620                 }
 621
 622 #if NET_2_0
 623                 public static string ToString (DateTime value, XmlDateTimeSerializationMode mode)
 624                 {
 625                         // Unlike usual DateTime formatting, it preserves
 626                         // MaxValue/MinValue as is.
 627                         switch (mode) {
 628                         case XmlDateTimeSerializationMode.Local:
 629                                 return (value == DateTime.MinValue ? DateTime.MinValue : value == DateTime.MaxValue ? value : value.ToLocalTime ()).ToString (
 630                                         "yyyy-MM-ddTHH:mm:ss.FFFFFFFzzz",
 631                                         CultureInfo.InvariantCulture);
 632                         case XmlDateTimeSerializationMode.RoundtripKind:
 633                                 return value.ToString (
 634                                         "yyyy-MM-ddTHH:mm:ss.FFFFFFFK",
 635                                         CultureInfo.InvariantCulture);
 636                         default:
 637                                 return value.ToString (
 638                                         "yyyy-MM-ddTHH:mm:ss.FFFFFFFzzz",
 639                                         CultureInfo.InvariantCulture);
 640                         case XmlDateTimeSerializationMode.Utc:
 641                                 return (value == DateTime.MinValue ? DateTime.MinValue : value == DateTime.MaxValue ? value : value.ToUniversalTime ()).ToString (
 642                                         "yyyy-MM-ddTHH:mm:ss.FFFFFFFZ",
 643                                         CultureInfo.InvariantCulture);
 644                         case XmlDateTimeSerializationMode.Unspecified:
 645                                 return value.ToString (
 646                                         "yyyy-MM-ddTHH:mm:ss.FFFFFFF",
 647                                         CultureInfo.InvariantCulture);
 648                         }
 649                 }
 650 #endif
 651
 652                 public static string ToString(DateTime value, string format)
 653                 {
 654                         return value.ToString(format, CultureInfo.InvariantCulture);
 655                 }
 656
 657                 public static TimeSpan ToTimeSpan(string s)
 658                 {
 659                         s = s.Trim (XmlChar.WhitespaceChars);
 660                         if (s.Length == 0)
 661                                 throw new FormatException ("Invalid format string for duration schema datatype.");
 662
 663                         int start = 0;
 664                         if (s [0] == '-')
 665                                 start = 1;
 666                         bool minusValue = (start == 1);
 667
 668                         if (s [start] != 'P')
 669                                 throw new FormatException ("Invalid format string for duration schema datatype.");
 670                         start++;
 671
 672                         int parseStep = 0;
 673                         int days = 0;
 674                         bool isTime = false;
 675                         int hours = 0;
 676                         int minutes = 0;
 677                         int seconds = 0;
 678                         long ticks = 0;
 679                         int parsedDigits = 0;
 680
 681                         bool error = false;
 682
 683                         int i = start;
 684                         while (i < s.Length) {
 685                                 if (s [i] == 'T') {
 686                                         isTime = true;
 687                                         parseStep = 4;
 688                                         i++;
 689                                         start = i;
 690                                         continue;
 691                                 }
 692                                 for (; i < s.Length; i++)
 693                                         if (s [i] < '0' || '9' < s [i])
 694                                                 break;
 695                                 if (parseStep == 7)
 696                                         parsedDigits = i - start;
 697                                 int value = int.Parse (s.Substring (start, i - start), CultureInfo.InvariantCulture);
 698                                 if (parseStep == 7) {
 699                                         // adjust to 7 digits so that it makes sense as millisecond digits
 700                                         for (; parsedDigits > 7; parsedDigits--)
 701                                                 value /= 10;
 702                                         for (; parsedDigits < 7; parsedDigits++)
 703                                                 value *= 10;
 704                                 }
 705                                 switch (s [i]) {
 706                                 case 'Y':
 707                                         days += value * 365;
 708                                         if (parseStep > 0)
 709                                                 error = true;
 710                                         else
 711                                                 parseStep = 1;
 712                                         break;
 713                                 case 'M':
 714                                         if (parseStep < 2) {
 715                                                 days += 365 * (value / 12) + 30 * (value % 12);
 716                                                 parseStep = 2;
 717                                         } else if (isTime && parseStep < 6) {
 718                                                 minutes = value;
 719                                                 parseStep = 6;
 720                                         }
 721                                         else
 722                                                 error = true;
 723                                         break;
 724                                 case 'D':
 725                                         days += value;
 726                                         if (parseStep > 2)
 727                                                 error = true;
 728                                         else
 729                                                 parseStep = 3;
 730                                         break;
 731                                 case 'H':
 732                                         hours = value;
 733                                         if (!isTime || parseStep > 4)
 734                                                 error = true;
 735                                         else
 736                                                 parseStep = 5;
 737                                         break;
 738                                 case 'S':
 739                                         if (parseStep == 7)
 740                                                 ticks = value;
 741                                         else
 742                                                 seconds = value;
 743                                         if (!isTime || parseStep > 7)
 744                                                 error = true;
 745                                         else
 746                                                 parseStep = 8;
 747                                         break;
 748                                 case '.':
 749                                         if (parseStep > 7)
 750                                                 error = true;
 751                                         seconds = value;
 752                                         parseStep = 7;
 753                                         break;
 754                                 default:
 755                                         error = true;
 756                                         break;
 757                                 }
 758                                 if (error)
 759                                         break;
 760                                 ++i;
 761                                 start = i;
 762                         }
 763                         if (error)
 764                                 throw new FormatException ("Invalid format string for duration schema datatype.");
 765                         TimeSpan ts = new TimeSpan (days, hours, minutes, seconds);
 766                         if (minusValue)
 767                                 return TimeSpan.FromTicks (- (ts.Ticks + ticks));
 768                         else
 769                                 return TimeSpan.FromTicks (ts.Ticks + ticks);
 770                 }
 771
 772                 [CLSCompliant (false)]
 773                 public static UInt16 ToUInt16(string s)
 774                 {
 775                         return UInt16.Parse(s, NumberStyles.Integer, CultureInfo.InvariantCulture);
 776                 }
 777
 778                 [CLSCompliant (false)]
 779                 public static UInt32 ToUInt32(string s)
 780                 {
 781                         return UInt32.Parse(s, NumberStyles.Integer, CultureInfo.InvariantCulture);
 782                 }
 783
 784                 [CLSCompliant (false)]
 785                 public static UInt64 ToUInt64(string s)
 786                 {
 787                         return UInt64.Parse(s, NumberStyles.Integer, CultureInfo.InvariantCulture);
 788                 }
 789
 790                 public static string VerifyName (string name)
 791                 {
 792                         if (name == null || name.Length == 0)
 793                                 throw new ArgumentNullException("name");
 794
 795                         if (!XmlChar.IsName (name))
 796                                 throw new XmlException("'" + name + "' is not a valid XML Name");
 797                         return name;
 798
 799                 }
 800
 801                 public static string VerifyNCName (string ncname)
 802                 {
 803                         if (ncname == null || ncname.Length == 0)
 804                                 throw new ArgumentNullException("ncname");
 805
 806                         if (!XmlChar.IsNCName (ncname))
 807                                 throw new XmlException ("'" + ncname + "' is not a valid XML NCName");
 808                         return ncname;
 809                 }
 810
 811 #if NET_2_0
 812                 public static string VerifyTOKEN (string name)
 813 #else
 814                 internal static string VerifyTOKEN (string name)
 815 #endif
 816                 {
 817                         if (name == null)
 818                                 throw new ArgumentNullException("name");
 819
 820                         if (name.Length == 0)
 821                                 return name;
 822
 823                         if (XmlChar.IsWhitespace (name [0]) ||
 824                                 XmlChar.IsWhitespace (name [name.Length - 1]))
 825                                 throw new XmlException ("Whitespace characters (#xA, #xD, #x9, #x20) are not allowed as leading or trailing whitespaces of xs:token.");
 826
 827                         for (int i = 0; i < name.Length; i++)
 828                                 if (XmlChar.IsWhitespace (name [i]) && name [i] != ' ')
 829                                 throw new XmlException ("Either #xA, #xD or #x9 are not allowed inside xs:token.");
 830
 831                         return name;
 832                 }
 833
 834 #if NET_2_0
 835                 public static string VerifyNMTOKEN (string name)
 836 #else
 837                 internal static string VerifyNMTOKEN (string name)
 838 #endif
 839                 {
 840                         if (name == null)
 841                                 throw new ArgumentNullException("name");
 842
 843                         if (!XmlChar.IsNmToken (name))
 844                                 throw new XmlException("'" + name + "' is not a valid XML NMTOKEN");
 845                         return name;
 846
 847                 }
 848
 849                 // It is documented as public method, but in fact it is not.
 850                 internal static byte [] FromBinHexString (string s)
 851                 {
 852                         char [] chars = s.ToCharArray ();
 853                         byte [] bytes = new byte [chars.Length / 2 + chars.Length % 2];
 854                         FromBinHexString (chars, 0, chars.Length, bytes);
 855                         return bytes;
 856                 }
 857
 858                 internal static int FromBinHexString (char [] chars, int offset, int charLength, byte [] buffer)
 859                 {
 860                         int bufIndex = offset;
 861                         for (int i = 0; i < charLength - 1; i += 2) {
 862                                 buffer [bufIndex] = (chars [i] > '9' ?
 863                                                 (byte) (chars [i] - 'A' + 10) :
 864                                                 (byte) (chars [i] - '0'));
 865                                 buffer [bufIndex] <<= 4;
 866                                 buffer [bufIndex] += chars [i + 1] > '9' ?
 867                                                 (byte) (chars [i + 1] - 'A' + 10) :
 868                                                 (byte) (chars [i + 1] - '0');
 869                                 bufIndex++;
 870                         }
 871                         if (charLength %2 != 0)
 872                                 buffer [bufIndex++] = (byte)
 873                                         ((chars [charLength - 1] > '9' ?
 874                                                 (byte) (chars [charLength - 1] - 'A' + 10) :
 875                                                 (byte) (chars [charLength - 1] - '0'))
 876                                         << 4);
 877
 878                         return bufIndex - offset;
 879                 }
 880
 881 #if NET_2_0 // actually NET_3_5
 882 #if !TARGET_JVM
 883
 884                 public static DateTimeOffset ToDateTimeOffset (string s)
 885                 {
 886                         return ToDateTimeOffset (s, datetimeFormats);
 887                 }
 888
 889                 public static DateTimeOffset ToDateTimeOffset (string s, string format)
 890                 {
 891                         return DateTimeOffset.ParseExact (s, format, CultureInfo.InvariantCulture, DateTimeStyles.AssumeUniversal);
 892                 }
 893
 894                 public static DateTimeOffset ToDateTimeOffset (string s, string [] formats)
 895                 {
 896                         DateTimeStyles style = DateTimeStyles.AllowLeadingWhite |
 897                                                DateTimeStyles.AllowTrailingWhite |
 898                                                DateTimeStyles.AssumeUniversal;
 899                         return DateTimeOffset.ParseExact (s, formats, CultureInfo.InvariantCulture, style);
 900                 }
 901
 902                 public static string ToString (DateTimeOffset value)
 903                 {
 904                         return ToString (value, "yyyy-MM-ddTHH:mm:ss.FFFFFFFzzz");
 905                 }
 906
 907                 public static string ToString (DateTimeOffset value, string format)
 908                 {
 909                         return value.ToString (format, CultureInfo.InvariantCulture);
 910                 }
 911 #endif
 912
 913                 // it is used only from 2.1 System.Xml.Serialization.dll from
 914                 // MS Silverlight SDK. We don't use it so far.
 915                 internal static Uri ToUri (string s)
 916                 {
 917                         return new Uri (s, UriKind.RelativeOrAbsolute);
 918                 }
 919
 920 #endif
 921         }
 922 }