mcs/class/Mono.Xml.Ext/Mono.Xml.XPath2/XQueryFunctionCliImpl.cs

   1 //
   2 // XQueryFunctionCliImple.cs
   3 //
   4 // Author:
   5 //      Atsushi Enomoto <atsushi@ximian.com>
   6 //
   7 //
   8 // Copyright (C) 2004 Novell, Inc (http://www.novell.com)
   9 //
  10 // Permission is hereby granted, free of charge, to any person obtaining
  11 // a copy of this software and associated documentation files (the
  12 // "Software"), to deal in the Software without restriction, including
  13 // without limitation the rights to use, copy, modify, merge, publish,
  14 // distribute, sublicense, and/or sell copies of the Software, and to
  15 // permit persons to whom the Software is furnished to do so, subject to
  16 // the following conditions:
  17 //
  18 // The above copyright notice and this permission notice shall be
  19 // included in all copies or substantial portions of the Software.
  20 //
  21 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  22 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  23 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  24 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  25 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  26 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  27 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  28 //
  29
  30 //
  31 // Runtime-level (native) implementation of XQuery 1.0 and XPath 2.0
  32 // Functions implementation. XQueryCliFunction
  33 // See XQuery 1.0 and XPath 2.0 Functions and Operators.
  34 //
  35 #if NET_2_0
  36 using System;
  37 using System.Collections;
  38 using System.Globalization;
  39 using System.IO;
  40 using System.Text.RegularExpressions;
  41 using System.Xml;
  42 using System.Xml.Query;
  43 using System.Xml.Schema;
  44 using System.Xml.XPath;
  45 using Mono.Xml;
  46
  47 namespace Mono.Xml.XPath2
  48 {
  49         public class XQueryFunctionCliImpl
  50         {
  51                 internal static XmlSchemaType XmlTypeFromCliType (Type cliType)
  52                 {
  53                         switch (Type.GetTypeCode (cliType)) {
  54                         case TypeCode.Int32:
  55                                 return InternalPool.XsInt;
  56                         case TypeCode.Decimal:
  57                                 return InternalPool.XsDecimal;
  58                         case TypeCode.Double:
  59                                 return InternalPool.XsDouble;
  60                         case TypeCode.Single:
  61                                 return InternalPool.XsFloat;
  62                         case TypeCode.Int64:
  63                                 return InternalPool.XsLong;
  64                         case TypeCode.Int16:
  65                                 return InternalPool.XsShort;
  66                         case TypeCode.UInt16:
  67                                 return InternalPool.XsUnsignedShort;
  68                         case TypeCode.UInt32:
  69                                 return InternalPool.XsUnsignedInt;
  70                         case TypeCode.String:
  71                                 return InternalPool.XsString;
  72                         case TypeCode.DateTime:
  73                                 return InternalPool.XsDateTime;
  74                         case TypeCode.Boolean:
  75                                 return InternalPool.XsBoolean;
  76                         }
  77                         if (cliType == typeof (XmlQualifiedName))
  78                                 return InternalPool.XsQName;
  79                         return null;
  80                 }
  81
  82                 private static XPathItem ToItem (object arg)
  83                 {
  84                         if (arg == null)
  85                                 return null;
  86                         XPathItem item = arg as XPathItem;
  87                         if (item != null)
  88                                 return item;
  89                         XPathSequence seq = arg as XPathSequence;
  90                         if (seq != null)
  91                                 return seq.MoveNext () ? seq.Current : null;
  92                         return new XPathAtomicValue (arg, XmlTypeFromCliType (arg.GetType ()));
  93                 }
  94
  95                 // Accessors
  96
  97                 public static XmlQualifiedName FnNodeName (XPathNavigator arg)
  98                 {
  99                         if (arg == null)
 100                                 return null;
 101
 102                         return arg.LocalName == String.Empty ?
 103                                 XmlQualifiedName.Empty :
 104                                 new XmlQualifiedName (arg.LocalName, arg.NamespaceURI);
 105                 }
 106
 107                 public static bool FnNilled (XPathNavigator arg)
 108                 {
 109                         if (arg == null)
 110                                 throw new XmlQueryException ("Function nilled() does not allow empty sequence parameter.");
 111
 112                         IXmlSchemaInfo info = arg.NodeType == XPathNodeType.Element ? arg.SchemaInfo : null;
 113                         return info != null && info.IsNil;
 114                 }
 115
 116                 public static string FnString (XQueryContext context)
 117                 {
 118                         XPathItem item = context.CurrentItem;
 119                         if (item == null)
 120                                 throw new ArgumentException ("FONC0001: undefined context item");
 121                         return FnString (item);
 122                 }
 123
 124                 [MonoTODO]
 125                 public static string FnString (object arg)
 126                 {
 127                         if (arg == null)
 128                                 return String.Empty;
 129                         XPathNavigator nav = arg as XPathNavigator;
 130                         if (nav != null)
 131                                 return nav.Value;
 132                         // FIXME: it should be exactly the same as "arg cast as xs:string"
 133                         XPathItem item = ToItem (arg);
 134                         return item != null ? XQueryConvert.ItemToString (item) : null;
 135                 }
 136
 137                 [MonoTODO]
 138                 public static XPathAtomicValue FnData (object arg)
 139                 {
 140                         // FIXME: parameter should be object []
 141                         XPathNavigator nav = arg as XPathNavigator;
 142                         if (nav != null) {
 143                                 XmlSchemaType st = nav.SchemaInfo != null ? nav.SchemaInfo.SchemaType : null;
 144                                 return new XPathAtomicValue (nav.TypedValue, st != null ? st : InternalPool.XsAnyType);
 145                         }
 146                         else
 147                                 return (XPathAtomicValue) arg;
 148                 }
 149
 150                 public static string FnBaseUri (XPathNavigator nav)
 151                 {
 152                         return nav != null ? nav.BaseURI : null;
 153                 }
 154
 155                 public static string FnDocumentUri (XPathNavigator nav)
 156                 {
 157                         if (nav == null)
 158                                 return null;
 159                         XPathNavigator root = nav.Clone ();
 160                         root.MoveToRoot ();
 161                         return root.BaseURI;
 162                 }
 163
 164                 // Error
 165
 166                 [MonoTODO]
 167                 public static void FnError (object arg)
 168                 {
 169                         throw new NotImplementedException ();
 170                 }
 171
 172                 // Trace
 173
 174                 [MonoTODO]
 175                 public static object FnTrace (XQueryContext ctx, object value, string label)
 176                 {
 177                         if (value == null)
 178                                 return new XPathEmptySequence (ctx);
 179                         XPathSequence seq = value as XPathSequence;
 180                         if (seq == null) {
 181                                 XPathAtomicValue av = value as XPathAtomicValue;
 182                                 if (av == null)
 183                                         av = new XPathAtomicValue (value,
 184                                                 InternalPool.GetBuiltInType (
 185                                                         InternalPool.XmlTypeCodeFromRuntimeType (
 186                                                                 value.GetType (), true)));
 187                                 seq = new SingleItemIterator (av, ctx);
 188                         }
 189                         return new TracingIterator (seq, label);
 190                 }
 191
 192                 // Numeric Operation
 193
 194                 [MonoTODO]
 195                 public static object FnAbs (object arg)
 196                 {
 197                         if (arg is int)
 198                                 return System.Math.Abs ((int) arg);
 199                         if (arg is long)
 200                                 return System.Math.Abs ((long) arg);
 201                         else if (arg is decimal)
 202                                 return System.Math.Abs ((decimal) arg);
 203                         else if (arg is double)
 204                                 return System.Math.Abs ((double) arg);
 205                         else if (arg is float)
 206                                 return System.Math.Abs ((float) arg);
 207                         else if (arg is short)
 208                                 return System.Math.Abs ((short) arg);
 209                         else if (arg is uint || arg is ulong || arg is ushort)
 210                                 return arg;
 211                         return null;
 212                 }
 213
 214                 [MonoTODO]
 215                 public static object FnCeiling (object arg)
 216                 {
 217                         if (arg is decimal) {
 218                                 decimal d = (decimal) arg;
 219                                 decimal d2 = Decimal.Floor (d);
 220                                 return d2 != d ? d2 + 1 : d2;
 221                         }
 222                         else if (arg is double || arg is float)
 223                                 return System.Math.Ceiling ((double) arg);
 224                         else if (arg is int || arg is long || arg is short || arg is uint || arg is ulong || arg is ushort)
 225                                 return arg;
 226                         return null;
 227                 }
 228
 229                 [MonoTODO]
 230                 public static object FnFloor (object arg)
 231                 {
 232                         if (arg is decimal)
 233                                 return Decimal.Floor ((decimal) arg);
 234                         else if (arg is double || arg is float)
 235                                 return System.Math.Floor ((double) arg);
 236                         else if (arg is int || arg is long || arg is short || arg is uint || arg is ulong || arg is ushort)
 237                                 return arg;
 238                         return null;
 239                 }
 240
 241                 [MonoTODO]
 242                 public static object FnRound (object arg)
 243                 {
 244                         if (arg is decimal)
 245                                 return Decimal.Round ((decimal) arg, 0);
 246                         else if (arg is double || arg is float)
 247                                 return System.Math.Round ((double) arg);
 248                         else if (arg is int || arg is long || arg is short || arg is uint || arg is ulong || arg is ushort)
 249                                 return arg;
 250                         return null;
 251                 }
 252
 253                 [MonoTODO]
 254                 public static object FnRoundHalfToEven (object arg)
 255                 {
 256                         throw new NotImplementedException ();
 257                 }
 258
 259                 [MonoTODO]
 260                 public static string FnCodepointsToString (int [] arg)
 261                 {
 262                         throw new NotImplementedException ();
 263                 }
 264
 265                 [MonoTODO]
 266                 public static int [] FnStringToCodepoints (string arg)
 267                 {
 268                         throw new NotImplementedException ();
 269                 }
 270
 271                 public static int FnCompare (XQueryContext ctx, string s1, string s2)
 272                 {
 273                         return FnCompare (s1, s2, ctx.DefaultCollation);
 274                 }
 275
 276                 public static int FnCompare (XQueryContext ctx, string s1, string s2, string collation)
 277                 {
 278                         return FnCompare (s1, s2, ctx.GetCulture (collation));
 279                 }
 280
 281                 private static int FnCompare (string s1, string s2, CultureInfo ci)
 282                 {
 283                         return ci.CompareInfo.Compare (s1, s2);
 284                 }
 285
 286                 public static string FnConcat (object o1, object o2)
 287                 {
 288                         return String.Concat (o1, o2);
 289                 }
 290
 291                 public static string FnStringJoin (string [] strings, string separator)
 292                 {
 293                         return String.Join (separator, strings);
 294                 }
 295
 296                 public static string FnSubstring (string src, double loc)
 297                 {
 298                         return src.Substring ((int) loc);
 299                 }
 300
 301                 public static string FnSubstring (string src, double loc, double length)
 302                 {
 303                         return src.Substring ((int) loc, (int) length);
 304                 }
 305
 306                 public static int FnStringLength (XQueryContext ctx)
 307                 {
 308                         return FnString (ctx).Length;
 309                 }
 310
 311                 public static int FnStringLength (string s)
 312                 {
 313                         return s.Length;
 314                 }
 315
 316                 public static string FnNormalizeSpace (XQueryContext ctx)
 317                 {
 318                         return FnNormalizeSpace (FnString (ctx));
 319                 }
 320
 321                 [MonoTODO]
 322                 public static string FnNormalizeSpace (string s)
 323                 {
 324                         throw new NotImplementedException ();
 325                 }
 326
 327                 public static string FnNormalizeUnicode (string arg)
 328                 {
 329                         return FnNormalizeUnicode (arg, "NFC");
 330                 }
 331
 332                 [MonoTODO]
 333                 public static string FnNormalizeUnicode (string arg, string normalizationForm)
 334                 {
 335                         throw new NotImplementedException ();
 336                 }
 337
 338                 public static string FnUpperCase (string arg)
 339                 {
 340                         // FIXME: supply culture
 341                         return arg.ToUpper ();
 342                 }
 343
 344                 public static string FnLowerCase (string arg)
 345                 {
 346                         // FIXME: supply culture
 347                         return arg.ToLower ();
 348                 }
 349
 350                 public static string FnTranslate (string arg, string mapString, string transString)
 351                 {
 352                         return arg == null ? null : arg.Replace (mapString, transString);
 353                 }
 354
 355                 [MonoTODO]
 356                 public static string FnEscapeUri (string uriPart, bool escapeReserved)
 357                 {
 358                         throw new NotImplementedException ();
 359                 }
 360
 361                 public static bool FnContains (XQueryContext ctx, string arg1, string arg2)
 362                 {
 363                         return FnContains (arg1, arg2, ctx.DefaultCollation);
 364                 }
 365
 366                 public static bool FnContains (XQueryContext ctx, string arg1, string arg2, string collation)
 367                 {
 368                         return FnContains (arg1, arg2, ctx.GetCulture (collation));
 369                 }
 370
 371                 private static bool FnContains (string arg1, string arg2, CultureInfo ci)
 372                 {
 373                         if (arg1 == null)
 374                                 arg1 = String.Empty;
 375                         if (arg2 == null)
 376                                 arg2 = String.Empty;
 377                         if (arg2 == String.Empty)
 378                                 return true;
 379                         return ci.CompareInfo.IndexOf (arg1, arg2) >= 0;
 380                 }
 381
 382                 public static bool FnStartsWith (XQueryContext ctx, string arg1, string arg2)
 383                 {
 384                         return FnStartsWith (arg1, arg2, ctx.DefaultCollation);
 385                 }
 386
 387                 public static bool FnStartsWith (XQueryContext ctx, string arg1, string arg2, string collation)
 388                 {
 389                         return FnStartsWith (arg1, arg2, ctx.GetCulture (collation));
 390                 }
 391
 392                 private static bool FnStartsWith (string arg1, string arg2, CultureInfo ci)
 393                 {
 394                         return ci.CompareInfo.IsPrefix (arg1, arg2);
 395                 }
 396
 397                 public static bool FnEndsWith (XQueryContext ctx, string arg1, string arg2)
 398                 {
 399                         return FnEndsWith (arg1, arg2, ctx.DefaultCollation);
 400                 }
 401
 402                 public static bool FnEndsWith (XQueryContext ctx, string arg1, string arg2, string collation)
 403                 {
 404                         return FnEndsWith (arg1, arg2, ctx.GetCulture (collation));
 405                 }
 406
 407                 private static bool FnEndsWith (string arg1, string arg2, CultureInfo ci)
 408                 {
 409                         return ci.CompareInfo.IsSuffix (arg1, arg2);
 410                 }
 411
 412                 public static string FnSubstringBefore (XQueryContext ctx, string arg1, string arg2)
 413                 {
 414                         return FnSubstringBefore (arg1, arg2, ctx.DefaultCollation);
 415                 }
 416
 417                 public static string FnSubstringBefore (XQueryContext ctx, string arg1, string arg2, string collation)
 418                 {
 419                         return FnSubstringBefore (arg1, arg2, ctx.GetCulture (collation));
 420                 }
 421
 422                 private static string FnSubstringBefore (string arg1, string arg2, CultureInfo ci)
 423                 {
 424                         int index = ci.CompareInfo.IndexOf (arg1, arg2);
 425                         return arg1.Substring (0, index);
 426                 }
 427
 428                 public static string FnSubstringAfter (XQueryContext ctx, string arg1, string arg2)
 429                 {
 430                         return FnSubstringAfter (arg1, arg2, ctx.DefaultCollation);
 431                 }
 432
 433                 public static string FnSubstringAfter (XQueryContext ctx, string arg1, string arg2, string collation)
 434                 {
 435                         return FnSubstringAfter (arg1, arg2, ctx.GetCulture (collation));
 436                 }
 437
 438                 private static string FnSubstringAfter (string arg1, string arg2, CultureInfo ci)
 439                 {
 440                         int index = ci.CompareInfo.IndexOf (arg1, arg2);
 441                         return arg1.Substring (index);
 442                 }
 443
 444                 public static bool FnMatches (string input, string pattern)
 445                 {
 446                         return new Regex (pattern).IsMatch (input);
 447                 }
 448
 449                 [MonoTODO]
 450                 public static bool FnMatches (string input, string pattern, string flags)
 451                 {
 452                         throw new NotImplementedException ();
 453                 }
 454
 455                 public static string FnReplace (string input, string pattern, string replace)
 456                 {
 457                         return new Regex (pattern).Replace (input, replace);
 458                 }
 459
 460                 [MonoTODO]
 461                 public static string FnReplace (string input, string pattern, string replace, string flags)
 462                 {
 463                         throw new NotImplementedException ();
 464                 }
 465
 466                 public static string [] FnTokenize (string input, string pattern)
 467                 {
 468                         return new Regex (pattern).Split (input);
 469                 }
 470
 471                 [MonoTODO]
 472                 public static string [] FnTokenize (string input, string pattern, string flags)
 473                 {
 474                         throw new NotImplementedException ();
 475                 }
 476
 477                 public static string FnResolveUri (XQueryContext ctx, string relUri)
 478                 {
 479                         return new Uri (new Uri (ctx.StaticContext.BaseUri), relUri).ToString ();
 480                 }
 481
 482                 public static string FnResolveUri (string relUri, string baseUri)
 483                 {
 484                         return new Uri (new Uri (baseUri), relUri).ToString ();
 485                 }
 486
 487                 public static object FnTrue ()
 488                 {
 489                         return true;
 490                 }
 491
 492                 public static object FnFalse ()
 493                 {
 494                         return false;
 495                 }
 496
 497                 public static object FnNot (bool value)
 498                 {
 499                         return !value;
 500                 }
 501
 502                 // FIXME: add a bunch of annoying datetime functions
 503
 504                 public static object FnResolveQName (string qname, XPathNavigator element)
 505                 {
 506                         if (qname == null)
 507                                 return null;
 508
 509                         int index = qname.IndexOf (':');
 510                         string prefix = (index < 0) ? "" : qname.Substring (index);
 511                         return new XmlQualifiedName (
 512                                 element.LookupNamespace (prefix),
 513                                 index < 0 ? qname : qname.Substring (index + 1));
 514                 }
 515
 516                 public static object FnExpandQName (string ns, string local)
 517                 {
 518                         return new XmlQualifiedName (local, ns);
 519                 }
 520
 521                 public static string FnLocalNameFromQName (XmlQualifiedName name)
 522                 {
 523                         return name != null ? name.Name : null;
 524                 }
 525
 526                 public static object FnNamespaceUriFromQName (XmlQualifiedName name)
 527                 {
 528                         return name != null ? name.Namespace : null;
 529                 }
 530
 531                 public static object FnNamespaceUriForPrefix (XQueryContext context, string prefix)
 532                 {
 533                         return prefix != null ? context.LookupNamespace (prefix) : null;
 534                 }
 535
 536                 public static string [] FnInScopePrefixes (XQueryContext context)
 537                 {
 538                         IDictionary dict = context.GetNamespacesInScope (XmlNamespaceScope.ExcludeXml);
 539                         ArrayList keys = new ArrayList (dict.Keys);
 540                         return keys.ToArray (typeof (string)) as string [];
 541                 }
 542
 543                 public static string FnName (XPathNavigator nav)
 544                 {
 545                         return nav != null ? nav.Name : null;
 546                 }
 547
 548                 public static string FnLocalName (XPathNavigator nav)
 549                 {
 550                         return nav != null ? nav.LocalName : null;
 551                 }
 552
 553                 public static string FnNamespaceUri (XPathNavigator nav)
 554                 {
 555                         return nav != null ? nav.NamespaceURI : null;
 556                 }
 557
 558                 public static double FnNumber (XQueryContext ctx)
 559                 {
 560                         return FnNumber (ctx.CurrentItem);
 561                 }
 562
 563                 public static double FnNumber (object arg)
 564                 {
 565                         if (arg == null)
 566                                 throw new XmlQueryException ("Context item could not be ndetermined during number() evaluation.");
 567                         XPathItem item = ToItem (arg);
 568                         return XQueryConvert.ItemToDouble (item);
 569                 }
 570
 571                 public static bool FnLang (XQueryContext ctx, string testLang)
 572                 {
 573                         return FnLang (testLang, ctx.CurrentNode);
 574                 }
 575
 576                 public static bool FnLang (string testLang, XPathNavigator node)
 577                 {
 578                         return testLang == node.XmlLang;
 579                 }
 580
 581                 public static XPathNavigator FnRoot (XQueryContext ctx)
 582                 {
 583                         if (ctx.CurrentItem == null)
 584                                 throw new XmlQueryException ("FONC0001: Undefined context item.");
 585                         if (ctx.CurrentNode == null)
 586                                 throw new XmlQueryException ("FOTY0011: Context item is not a node.");
 587                         return FnRoot (ctx.CurrentNode);
 588                 }
 589
 590                 public static XPathNavigator FnRoot (XPathNavigator node)
 591                 {
 592                         if (node == null)
 593                                 return null;
 594                         XPathNavigator root = node.Clone ();
 595                         root.MoveToRoot ();
 596                         return root;
 597                 }
 598
 599                 public static bool FnBoolean (IEnumerator e)
 600                 {
 601                         if (!e.MoveNext ())
 602                                 return false;
 603                         XPathItem item = e.Current as XPathItem;
 604                         if (e.MoveNext ())
 605                                 return true;
 606                         return XQueryConvert.ItemToBoolean (item);
 607                 }
 608
 609                 public static XPathSequence FnIndexOf (XQueryContext ctx, XPathSequence items, XPathItem item)
 610                 {
 611                         return FnIndexOf (ctx, items, item, ctx.DefaultCollation);
 612                 }
 613
 614                 public static XPathSequence FnIndexOf (XQueryContext ctx, XPathSequence items, XPathItem item, CultureInfo ci)
 615                 {
 616                         ArrayList al = new ArrayList ();
 617                         IEnumerator e = items.GetEnumerator ();
 618                         for (int i = 0; e.MoveNext (); i++) {
 619                                 XPathItem iter = e.Current as XPathItem;
 620                                 if (iter.XmlType.TypeCode == XmlTypeCode.String) {
 621                                         if (ci.CompareInfo.Compare (iter.Value, item.Value) == 0)
 622                                                 al.Add (i);
 623                                 }
 624                                 else {
 625                                         IComparable ic = (IComparable) iter.TypedValue;
 626                                         if (ic.CompareTo ((IComparable) item.TypedValue) == 0)
 627                                                 al.Add (i);
 628                                 }
 629                         }
 630                         return new ListIterator (ctx, al);
 631                 }
 632
 633                 public static bool FnEmpty (XPathSequence e)
 634                 {
 635                         if (e is XPathEmptySequence)
 636                                 return true;
 637                         return !e.GetEnumerator ().MoveNext ();
 638                 }
 639
 640                 public static bool FnExists (XPathSequence e)
 641                 {
 642                         if (e is XPathEmptySequence)
 643                                 return false;
 644                         return e.MoveNext ();
 645                 }
 646
 647                 public static XPathSequence FnDistinctValues (XQueryContext ctx, XPathSequence items)
 648                 {
 649                         return FnDistinctValuesImpl (ctx, items, ctx.DefaultCollation);
 650                 }
 651
 652                 public static XPathSequence FnDistinctValues (XQueryContext ctx, XPathSequence items, string collation)
 653                 {
 654                         return FnDistinctValuesImpl (ctx, items, ctx.GetCulture (collation));
 655                 }
 656
 657                 private static XPathSequence FnDistinctValuesImpl (XQueryContext ctx, XPathSequence items, CultureInfo collation)
 658                 {
 659                         return new DistinctValueIterator (ctx, items, collation);
 660                 }
 661
 662                 public static XPathSequence FnInsertBefore (XPathSequence target, int position, XPathSequence inserts)
 663                 {
 664                         if (position < 1)
 665                                 position = 1;
 666                         return new InsertingIterator (target, position, inserts);
 667                 }
 668
 669                 public static XPathSequence FnRemove (XPathSequence target, int position)
 670                 {
 671                         if (position < 1)
 672                                 return target;
 673                         return new RemovalIterator (target, position);
 674                 }
 675
 676                 [MonoTODO ("optimize")]
 677                 public static XPathSequence FnReverse (XPathSequence arg)
 678                 {
 679                         ArrayList al = new ArrayList ();
 680                         while (arg.MoveNext ())
 681                                 al.Add (arg.Current);
 682                         al.Reverse ();
 683                         return new ListIterator (arg.Context, al);
 684                 }
 685
 686                 public static object FnSubsequence (XPathSequence sourceSeq, double startingLoc)
 687                 {
 688                         return FnSubsequence (sourceSeq, startingLoc, double.MaxValue);
 689                 }
 690
 691                 [MonoTODO]
 692                 public static object FnSubsequence (XPathSequence sourceSeq, double startingLoc, double length)
 693                 {
 694                         throw new NotImplementedException ();
 695                 }
 696
 697                 [MonoTODO]
 698                 // Basically it should be optimized by XQueryASTCompiler
 699                 public static XPathSequence FnUnordered (XPathSequence e)
 700                 {
 701                         return e;
 702                 }
 703
 704                 public static XPathItem FnZeroOrOne (XPathSequence e)
 705                 {
 706                         if (!e.MoveNext ())
 707                                 return null;
 708                         XPathItem item = e.Current;
 709                         if (e.MoveNext ())
 710                                 throw new XmlQueryException ("zero-or-one() function detected that the argument sequence contains two or more items.");
 711                         return item;
 712                 }
 713
 714                 public static object FnOneOrMore (XPathSequence e)
 715                 {
 716                         if (!e.Clone ().MoveNext ())
 717                                 throw new XmlQueryException ("one-or-more() function detected that the argument sequence contains no items.");
 718                         return e;
 719                 }
 720
 721                 public static XPathItem FnExactlyOne (XPathSequence e)
 722                 {
 723                         if (!e.MoveNext ())
 724                                 throw new XmlQueryException ("exactly-one() function detected that the argument sequence contains no items.");
 725                         XPathItem item = e.Current;
 726                         if (e.MoveNext ())
 727                                 throw new XmlQueryException ("exactly-one() function detected that the argument sequence contains two or more items.");
 728                         return item;
 729                 }
 730
 731                 public static object FnDeepEqual (XQueryContext ctx, XPathSequence p1, XPathSequence p2)
 732                 {
 733                         return FnDeepEqualImpl (p1, p2, ctx.DefaultCollation);
 734                 }
 735
 736                 public static object FnDeepEqual (XQueryContext ctx, XPathSequence p1, XPathSequence p2, string collation)
 737                 {
 738                         return FnDeepEqualImpl (p1, p2, ctx.GetCulture (collation));
 739                 }
 740
 741                 public static bool FnDeepEqualImpl (XPathSequence p1, XPathSequence p2, CultureInfo collation)
 742                 {
 743                         // FIXME: use collation
 744                         while (p1.MoveNext ()) {
 745                                 if (!p2.MoveNext ())
 746                                         return false;
 747                                 if (!FnDeepEqualItem (p1.Current, p2.Current, collation))
 748                                         return false;
 749                         }
 750                         if (p2.MoveNext ())
 751                                 return false;
 752                         return true;
 753                 }
 754
 755                 // FIXME: Actually ValueEQ() should consider collation.
 756                 [MonoTODO]
 757                 private static bool FnDeepEqualItem (XPathItem i1, XPathItem i2, CultureInfo collation)
 758                 {
 759                         XPathAtomicValue av1 = i1 as XPathAtomicValue;
 760                         XPathAtomicValue av2 = i1 as XPathAtomicValue;
 761                         if (av1 != null && av2 != null) {
 762                                 try {
 763                                         return XQueryComparisonOperator.ValueEQ (av1, av2);
 764                                 } catch (XmlQueryException) {
 765                                         // not-allowed comparison never raises
 766                                         // an error here, just return false.
 767                                         return false;
 768                                 }
 769                         }
 770                         else if (av1 != null || av2 != null)
 771                                 return false;
 772
 773                         XPathNavigator n1 = i1 as XPathNavigator;
 774                         XPathNavigator n2 = i2 as XPathNavigator;
 775                         if (n1.NodeType != n2.NodeType)
 776                                 return false;
 777                         switch (n1.NodeType) {
 778                         case XPathNodeType.Root:
 779                                 throw new NotImplementedException ();
 780                         case XPathNodeType.Element:
 781                                 throw new NotImplementedException ();
 782                         case XPathNodeType.Attribute:
 783                                 return n1.Name == n2.Name && n1.TypedValue == n2.TypedValue;
 784                         case XPathNodeType.ProcessingInstruction:
 785                         case XPathNodeType.Namespace:
 786                                 return n1.Name == n2.Name && n1.Value == n2.Value;
 787                         case XPathNodeType.Text:
 788                         case XPathNodeType.Comment:
 789                                 return n1.Value == n2.Value;
 790                         }
 791                         return false;
 792                 }
 793
 794                 public static int FnCount (XPathSequence e)
 795                 {
 796                         if (e == null)
 797                                 return 0;
 798                         return e.Count;
 799                 }
 800
 801                 [MonoTODO]
 802                 public static object FnAvg (XPathSequence e)
 803                 {
 804                         if (!e.MoveNext ())
 805                                 return null;
 806                         switch (e.Current.XmlType.TypeCode) {
 807                         case XmlTypeCode.DayTimeDuration:
 808                                 return FnAvgDayTimeDuration (e);
 809                         case XmlTypeCode.YearMonthDuration:
 810                                 return FnAvgYearMonthDuration (e);
 811                         case XmlTypeCode.Decimal:
 812                                 return FnAvgDecimal (e);
 813                         case XmlTypeCode.Integer:
 814                                 return FnAvgInteger (e);
 815                         case XmlTypeCode.Float:
 816                                 return FnAvgFloat (e);
 817                         case XmlTypeCode.UntypedAtomic:
 818                         case XmlTypeCode.Double:
 819                                 return FnAvgDouble (e);
 820                         }
 821                         throw new XmlQueryException ("avg() function detected that the sequence contains an item whose type is neither of dayTimeDuration, yearMonthDuration, decimal, integer, float, double, nor untypedAtomic.");
 822                 }
 823
 824                 private static TimeSpan FnAvgDayTimeDuration (XPathSequence e)
 825                 {
 826                         throw new NotImplementedException ();
 827                 }
 828
 829                 private static TimeSpan FnAvgYearMonthDuration (XPathSequence e)
 830                 {
 831                         throw new NotImplementedException ();
 832                 }
 833
 834                 private static TimeSpan FnAvgDecimal (XPathSequence e)
 835                 {
 836                         throw new NotImplementedException ();
 837                 }
 838
 839                 private static TimeSpan FnAvgInteger (XPathSequence e)
 840                 {
 841                         throw new NotImplementedException ();
 842                 }
 843
 844                 private static TimeSpan FnAvgFloat (XPathSequence e)
 845                 {
 846                         throw new NotImplementedException ();
 847                 }
 848
 849                 private static TimeSpan FnAvgDouble (XPathSequence e)
 850                 {
 851                         throw new NotImplementedException ();
 852                 }
 853
 854                 public static object FnMax (XQueryContext ctx, XPathSequence e)
 855                 {
 856                         return FnMaxImpl (e, ctx.DefaultCollation);
 857                 }
 858
 859                 public static object FnMax (XQueryContext ctx, XPathSequence e, string collation)
 860                 {
 861                         return FnMaxImpl (e, ctx.GetCulture (collation));
 862                 }
 863
 864                 private static object FnMaxImpl (XPathSequence e, CultureInfo collation)
 865                 {
 866                         if (!e.MoveNext ())
 867                                 return null;
 868                         switch (e.Current.XmlType.TypeCode) {
 869                         case XmlTypeCode.DayTimeDuration:
 870                                 return FnMaxDayTimeDuration (e);
 871                         case XmlTypeCode.YearMonthDuration:
 872                                 return FnMaxYearMonthDuration (e);
 873                         case XmlTypeCode.Decimal:
 874                                 return FnMaxDecimal (e);
 875                         case XmlTypeCode.Integer:
 876                                 return FnMaxInteger (e);
 877                         case XmlTypeCode.Float:
 878                                 return FnMaxFloat (e);
 879                         case XmlTypeCode.UntypedAtomic:
 880                         case XmlTypeCode.Double:
 881                                 return FnMaxDouble (e);
 882                         }
 883                         throw new XmlQueryException ("avg() function detected that the sequence contains an item whose type is neither of dayTimeDuration, yearMonthDuration, decimal, integer, float, double, nor untypedAtomic.");
 884                 }
 885
 886                 private static TimeSpan FnMaxDayTimeDuration (XPathSequence e)
 887                 {
 888                         // FIXME: reject yMD (but is it possible...?)
 889                         TimeSpan ret = TimeSpan.Zero;
 890                         do {
 891                                 TimeSpan ts = (TimeSpan) e.Current.TypedValue;
 892                                 if (ts > ret)
 893                                         ret = ts;
 894                         } while (e.MoveNext ());
 895                         return ret;
 896                 }
 897
 898                 private static TimeSpan FnMaxYearMonthDuration (XPathSequence e)
 899                 {
 900                         // FIXME: reject dTD (but is it possible...?)
 901                         TimeSpan ret = TimeSpan.Zero;
 902                         do {
 903                                 TimeSpan ts = (TimeSpan) e.Current.TypedValue;
 904                                 if (ts > ret)
 905                                         ret = ts;
 906                         } while (e.MoveNext ());
 907                         return ret;
 908                 }
 909
 910                 private static decimal FnMaxDecimal (XPathSequence e)
 911                 {
 912                         decimal ret = decimal.MinValue;
 913                         do {
 914                                 ret = System.Math.Max (e.Current.ValueAsDecimal, ret);
 915                         } while (e.MoveNext ());
 916                         return ret;
 917                 }
 918
 919                 private static int FnMaxInteger (XPathSequence e)
 920                 {
 921                         int ret = int.MinValue;
 922                         do {
 923                                 ret = System.Math.Max (e.Current.ValueAsInt32, ret);
 924                         } while (e.MoveNext ());
 925                         return ret;
 926                 }
 927
 928                 private static float FnMaxFloat (XPathSequence e)
 929                 {
 930                         float ret = float.MinValue;
 931                         do {
 932                                 ret = System.Math.Max (e.Current.ValueAsSingle, ret);
 933                         } while (e.MoveNext ());
 934                         return ret;
 935                 }
 936
 937                 private static double FnMaxDouble (XPathSequence e)
 938                 {
 939                         double ret = double.MinValue;
 940                         do {
 941                                 ret = System.Math.Max (e.Current.ValueAsDouble, ret);
 942                         } while (e.MoveNext ());
 943                         return ret;
 944                 }
 945
 946                 public static object FnMin (XQueryContext ctx, XPathSequence e)
 947                 {
 948                         return FnMinImpl (e, ctx.DefaultCollation);
 949                 }
 950
 951                 public static object FnMin (XQueryContext ctx, XPathSequence e, string collation)
 952                 {
 953                         return FnMinImpl (e, ctx.GetCulture (collation));
 954                 }
 955
 956                 private static object FnMinImpl (XPathSequence e, CultureInfo collation)
 957                 {
 958                         if (!e.MoveNext ())
 959                                 return null;
 960                         switch (e.Current.XmlType.TypeCode) {
 961                         case XmlTypeCode.DayTimeDuration:
 962                                 return FnMinDayTimeDuration (e);
 963                         case XmlTypeCode.YearMonthDuration:
 964                                 return FnMinYearMonthDuration (e);
 965                         case XmlTypeCode.Decimal:
 966                                 return FnMinDecimal (e);
 967                         case XmlTypeCode.Integer:
 968                                 return FnMinInteger (e);
 969                         case XmlTypeCode.Float:
 970                                 return FnMinFloat (e);
 971                         case XmlTypeCode.UntypedAtomic:
 972                         case XmlTypeCode.Double:
 973                                 return FnMinDouble (e);
 974                         }
 975                         throw new XmlQueryException ("avg() function detected that the sequence contains an item whose type is neither of dayTimeDuration, yearMonthDuration, decimal, integer, float, double, nor untypedAtomic.");
 976                 }
 977
 978                 private static TimeSpan FnMinDayTimeDuration (XPathSequence e)
 979                 {
 980                         // FIXME: reject yMD (but is it possible...?)
 981                         TimeSpan ret = TimeSpan.Zero;
 982                         do {
 983                                 TimeSpan ts = (TimeSpan) e.Current.TypedValue;
 984                                 if (ts > ret)
 985                                         ret = ts;
 986                         } while (e.MoveNext ());
 987                         return ret;
 988                 }
 989
 990                 private static TimeSpan FnMinYearMonthDuration (XPathSequence e)
 991                 {
 992                         // FIXME: reject dTD (but is it possible...?)
 993                         TimeSpan ret = TimeSpan.Zero;
 994                         do {
 995                                 TimeSpan ts = (TimeSpan) e.Current.TypedValue;
 996                                 if (ts > ret)
 997                                         ret = ts;
 998                         } while (e.MoveNext ());
 999                         return ret;
1000                 }
1001
1002                 private static decimal FnMinDecimal (XPathSequence e)
1003                 {
1004                         decimal ret = decimal.MaxValue;
1005                         do {
1006                                 ret = System.Math.Min (e.Current.ValueAsDecimal, ret);
1007                         } while (e.MoveNext ());
1008                         return ret;
1009                 }
1010
1011                 private static int FnMinInteger (XPathSequence e)
1012                 {
1013                         int ret = int.MaxValue;
1014                         do {
1015                                 ret = System.Math.Min (e.Current.ValueAsInt32, ret);
1016                         } while (e.MoveNext ());
1017                         return ret;
1018                 }
1019
1020                 private static float FnMinFloat (XPathSequence e)
1021                 {
1022                         float ret = float.MaxValue;
1023                         do {
1024                                 ret = System.Math.Min (e.Current.ValueAsSingle, ret);
1025                         } while (e.MoveNext ());
1026                         return ret;
1027                 }
1028
1029                 private static double FnMinDouble (XPathSequence e)
1030                 {
1031                         double ret = double.MaxValue;
1032                         do {
1033                                 ret = System.Math.Min (e.Current.ValueAsDouble, ret);
1034                         } while (e.MoveNext ());
1035                         return ret;
1036                 }
1037
1038                 [MonoTODO]
1039                 public static object FnSum (XPathSequence e)
1040                 {
1041                         throw new NotImplementedException ();
1042                 }
1043
1044                 [MonoTODO]
1045                 public static object FnSum (XPathSequence e, XPathItem zero)
1046                 {
1047                         throw new NotImplementedException ();
1048                 }
1049
1050                 public static XPathNavigator FnId (XQueryContext ctx, string id)
1051                 {
1052                         return FnId (id, ctx.CurrentNode);
1053                 }
1054
1055                 public static XPathNavigator FnId (string id, XPathNavigator nav)
1056                 {
1057                         XPathNavigator node = nav.Clone ();
1058                         return node.MoveToId (id) ? node : null;
1059                 }
1060
1061                 [MonoTODO]
1062                 public static object FnIdRef (XQueryContext ctx, string arg)
1063                 {
1064                         return FnIdRef (arg, ctx.CurrentNode);
1065                 }
1066
1067                 [MonoTODO]
1068                 public static object FnIdRef (string arg, XPathNavigator node)
1069                 {
1070                         throw new NotImplementedException ();
1071                 }
1072
1073                 public static XPathNavigator FnDoc (XQueryContext ctx, string uri)
1074                 {
1075                         XmlResolver res = ctx.ContextManager.ExtDocResolver;
1076                         string baseUriString = ctx.StaticContext.BaseUri;
1077                         Uri baseUri = null;
1078                         if (baseUriString != null && baseUriString != String.Empty)
1079                                 baseUri = new Uri (baseUriString);
1080                         Uri relUri = res.ResolveUri (baseUri, uri);
1081                         Stream s = res.GetEntity (relUri, null, typeof (Stream)) as Stream;
1082                         try {
1083                                 XPathDocument doc = new XPathDocument (new XmlValidatingReader (new XmlTextReader (s)), XmlSpace.Preserve);
1084                                 return doc.CreateNavigator ();
1085                         } finally {
1086                                 s.Close ();
1087                         }
1088                 }
1089
1090                 public static XPathSequence FnCollection (XQueryContext ctx, string name)
1091                 {
1092                         return ctx.ResolveCollection (name);
1093                 }
1094
1095                 [XQueryFunctionContext]
1096                 public static int FnPosition (XPathSequence current)
1097                 {
1098                         return current.Position;
1099                 }
1100
1101                 [XQueryFunctionContext]
1102                 public static int FnLast (XPathSequence current)
1103                 {
1104                         return current.Count;
1105                 }
1106
1107                 public static DateTime FnCurrentDateTime ()
1108                 {
1109                         return DateTime.Now;
1110                 }
1111
1112                 public static DateTime FnCurrentDate ()
1113                 {
1114                         return DateTime.Today;
1115                 }
1116
1117                 public static DateTime FnCurrentTime ()
1118                 {
1119                         return new DateTime (DateTime.Now.TimeOfDay.Ticks);
1120                 }
1121
1122                 [MonoTODO]
1123                 public static object FnDefaultCollation ()
1124                 {
1125                         throw new NotImplementedException ();
1126                 }
1127
1128                 [MonoTODO]
1129                 public static object FnImplicitTimeZone ()
1130                 {
1131                         throw new NotImplementedException ();
1132                 }
1133         }
1134 }
1135 #endif