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