mcs/mcs/doc.cs

   1 //
   2 // doc.cs: Support for XML documentation comment.
   3 //
   4 // Author:
   5 //      Atsushi Enomoto <atsushi@ximian.com>
   6 //
   7 // Dual licensed under the terms of the MIT X11 or GNU GPL
   8 //
   9 // Copyright 2004 Novell, Inc.
  10 //
  11 //
  12 #if ! BOOTSTRAP_WITH_OLDLIB
  13 using System;
  14 using System.Collections;
  15 using System.Collections.Specialized;
  16 using System.IO;
  17 using System.Reflection;
  18 using System.Reflection.Emit;
  19 using System.Runtime.CompilerServices;
  20 using System.Runtime.InteropServices;
  21 using System.Security;
  22 using System.Security.Permissions;
  23 using System.Text;
  24 using System.Xml;
  25
  26 using Mono.CompilerServices.SymbolWriter;
  27
  28 namespace Mono.CSharp {
  29
  30         //
  31         // Support class for XML documentation.
  32         //
  33 #if NET_2_0
  34         static
  35 #else
  36         abstract
  37 #endif
  38         public class DocUtil
  39         {
  40 #if !NET_2_0
  41                 private DocUtil () {}
  42 #endif
  43                 // TypeContainer
  44
  45                 //
  46                 // Generates xml doc comments (if any), and if required,
  47                 // handle warning report.
  48                 //
  49                 internal static void GenerateTypeDocComment (TypeContainer t,
  50                         DeclSpace ds)
  51                 {
  52                         GenerateDocComment (t, ds);
  53
  54                         if (t.DefaultStaticConstructor != null)
  55                                 t.DefaultStaticConstructor.GenerateDocComment (t);
  56
  57                         if (t.InstanceConstructors != null)
  58                                 foreach (Constructor c in t.InstanceConstructors)
  59                                         c.GenerateDocComment (t);
  60
  61                         if (t.Types != null)
  62                                 foreach (TypeContainer tc in t.Types)
  63                                         tc.GenerateDocComment (t);
  64
  65                         if (t.Delegates != null)
  66                                 foreach (Delegate de in t.Delegates)
  67                                         de.GenerateDocComment (t);
  68
  69                         if (t.Constants != null)
  70                                 foreach (Const c in t.Constants)
  71                                         c.GenerateDocComment (t);
  72
  73                         if (t.Fields != null)
  74                                 foreach (FieldBase f in t.Fields)
  75                                         f.GenerateDocComment (t);
  76
  77                         if (t.Events != null)
  78                                 foreach (Event e in t.Events)
  79                                         e.GenerateDocComment (t);
  80
  81                         if (t.Indexers != null)
  82                                 foreach (Indexer ix in t.Indexers)
  83                                         ix.GenerateDocComment (t);
  84
  85                         if (t.Properties != null)
  86                                 foreach (Property p in t.Properties)
  87                                         p.GenerateDocComment (t);
  88
  89                         if (t.Methods != null)
  90                                 foreach (Method m in t.Methods)
  91                                         m.GenerateDocComment (t);
  92
  93                         if (t.Operators != null)
  94                                 foreach (Operator o in t.Operators)
  95                                         o.GenerateDocComment (t);
  96                 }
  97
  98                 // MemberCore
  99                 private static readonly string line_head =
 100                         Environment.NewLine + "            ";
 101
 102                 private static XmlNode GetDocCommentNode (MemberCore mc,
 103                         string name)
 104                 {
 105                         // FIXME: It could be even optimizable as not
 106                         // to use XmlDocument. But anyways the nodes
 107                         // are not kept in memory.
 108                         XmlDocument doc = RootContext.Documentation.XmlDocumentation;
 109                         try {
 110                                 XmlElement el = doc.CreateElement ("member");
 111                                 el.SetAttribute ("name", name);
 112                                 string normalized = mc.DocComment;
 113                                 el.InnerXml = normalized;
 114                                 // csc keeps lines as written in the sources
 115                                 // and inserts formatting indentation (which
 116                                 // is different from XmlTextWriter.Formatting
 117                                 // one), but when a start tag contains an
 118                                 // endline, it joins the next line. We don't
 119                                 // have to follow such a hacky behavior.
 120                                 string [] split =
 121                                         normalized.Split ('\n');
 122                                 int j = 0;
 123                                 for (int i = 0; i < split.Length; i++) {
 124                                         string s = split [i].TrimEnd ();
 125                                         if (s.Length > 0)
 126                                                 split [j++] = s;
 127                                 }
 128                                 el.InnerXml = line_head + String.Join (
 129                                         line_head, split, 0, j);
 130                                 return el;
 131                         } catch (Exception ex) {
 132                                 Report.Warning (1570, 1, mc.Location, "XML comment on `{0}' has non-well-formed XML ({1})", name, ex.Message);
 133                                 XmlComment com = doc.CreateComment (String.Format ("FIXME: Invalid documentation markup was found for member {0}", name));
 134                                 return com;
 135                         }
 136                 }
 137
 138                 //
 139                 // Generates xml doc comments (if any), and if required,
 140                 // handle warning report.
 141                 //
 142                 internal static void GenerateDocComment (MemberCore mc,
 143                         DeclSpace ds)
 144                 {
 145                         if (mc.DocComment != null) {
 146                                 string name = mc.GetDocCommentName (ds);
 147
 148                                 XmlNode n = GetDocCommentNode (mc, name);
 149
 150                                 XmlElement el = n as XmlElement;
 151                                 if (el != null) {
 152                                         mc.OnGenerateDocComment (el);
 153
 154                                         // FIXME: it could be done with XmlReader
 155                                         XmlNodeList nl = n.SelectNodes (".//include");
 156                                         if (nl.Count > 0) {
 157                                                 // It could result in current node removal, so prepare another list to iterate.
 158                                                 ArrayList al = new ArrayList (nl.Count);
 159                                                 foreach (XmlNode inc in nl)
 160                                                         al.Add (inc);
 161                                                 foreach (XmlElement inc in al)
 162                                                         if (!HandleInclude (mc, inc))
 163                                                                 inc.ParentNode.RemoveChild (inc);
 164                                         }
 165
 166                                         // FIXME: it could be done with XmlReader
 167                                         DeclSpace ds_target = mc as DeclSpace;
 168                                         if (ds_target == null)
 169                                                 ds_target = ds;
 170
 171                                         foreach (XmlElement see in n.SelectNodes (".//see"))
 172                                                 HandleSee (mc, ds_target, see);
 173                                         foreach (XmlElement seealso in n.SelectNodes (".//seealso"))
 174                                                 HandleSeeAlso (mc, ds_target, seealso);
 175                                         foreach (XmlElement see in n.SelectNodes (".//exception"))
 176                                                 HandleException (mc, ds_target, see);
 177                                 }
 178
 179                                 n.WriteTo (RootContext.Documentation.XmlCommentOutput);
 180                         }
 181                         else if (mc.IsExposedFromAssembly ()) {
 182                                 Constructor c = mc as Constructor;
 183                                 if (c == null || !c.IsDefault ())
 184                                         Report.Warning (1591, 4, mc.Location,
 185                                                 "Missing XML comment for publicly visible type or member `{0}'", mc.GetSignatureForError ());
 186                         }
 187                 }
 188
 189                 //
 190                 // Processes "include" element. Check included file and
 191                 // embed the document content inside this documentation node.
 192                 //
 193                 private static bool HandleInclude (MemberCore mc, XmlElement el)
 194                 {
 195                         bool keep_include_node = false;
 196                         string file = el.GetAttribute ("file");
 197                         string path = el.GetAttribute ("path");
 198                         if (file == "") {
 199                                 Report.Warning (1590, 1, mc.Location, "Invalid XML `include' element. Missing `file' attribute");
 200                                 el.ParentNode.InsertBefore (el.OwnerDocument.CreateComment (" Include tag is invalid "), el);
 201                                 keep_include_node = true;
 202                         }
 203                         else if (path.Length == 0) {
 204                                 Report.Warning (1590, 1, mc.Location, "Invalid XML `include' element. Missing `path' attribute");
 205                                 el.ParentNode.InsertBefore (el.OwnerDocument.CreateComment (" Include tag is invalid "), el);
 206                                 keep_include_node = true;
 207                         }
 208                         else {
 209                                 XmlDocument doc = RootContext.Documentation.StoredDocuments [file] as XmlDocument;
 210                                 if (doc == null) {
 211                                         try {
 212                                                 doc = new XmlDocument ();
 213                                                 doc.Load (file);
 214                                                 RootContext.Documentation.StoredDocuments.Add (file, doc);
 215                                         } catch (Exception) {
 216                                                 el.ParentNode.InsertBefore (el.OwnerDocument.CreateComment (String.Format (" Badly formed XML in at comment file `{0}': cannot be included ", file)), el);
 217                                                 Report.Warning (1592, 1, mc.Location, "Badly formed XML in included comments file -- `{0}'", file);
 218                                         }
 219                                 }
 220                                 if (doc != null) {
 221                                         try {
 222                                                 XmlNodeList nl = doc.SelectNodes (path);
 223                                                 if (nl.Count == 0) {
 224                                                         el.ParentNode.InsertBefore (el.OwnerDocument.CreateComment (" No matching elements were found for the include tag embedded here. "), el);
 225
 226                                                         keep_include_node = true;
 227                                                 }
 228                                                 foreach (XmlNode n in nl)
 229                                                         el.ParentNode.InsertBefore (el.OwnerDocument.ImportNode (n, true), el);
 230                                         } catch (Exception ex) {
 231                                                 el.ParentNode.InsertBefore (el.OwnerDocument.CreateComment (" Failed to insert some or all of included XML "), el);
 232                                                 Report.Warning (1589, 1, mc.Location, "Unable to include XML fragment `{0}' of file `{1}' ({2})", path, file, ex.Message);
 233                                         }
 234                                 }
 235                         }
 236                         return keep_include_node;
 237                 }
 238
 239                 //
 240                 // Handles <see> elements.
 241                 //
 242                 private static void HandleSee (MemberCore mc,
 243                         DeclSpace ds, XmlElement see)
 244                 {
 245                         HandleXrefCommon (mc, ds, see);
 246                 }
 247
 248                 //
 249                 // Handles <seealso> elements.
 250                 //
 251                 private static void HandleSeeAlso (MemberCore mc,
 252                         DeclSpace ds, XmlElement seealso)
 253                 {
 254                         HandleXrefCommon (mc, ds, seealso);
 255                 }
 256
 257                 //
 258                 // Handles <exception> elements.
 259                 //
 260                 private static void HandleException (MemberCore mc,
 261                         DeclSpace ds, XmlElement seealso)
 262                 {
 263                         HandleXrefCommon (mc, ds, seealso);
 264                 }
 265
 266                 static readonly char [] wsChars =
 267                         new char [] {' ', '\t', '\n', '\r'};
 268
 269                 //
 270                 // returns a full runtime type name from a name which might
 271                 // be C# specific type name.
 272                 //
 273                 private static Type FindDocumentedType (MemberCore mc, string name, DeclSpace ds, string cref)
 274                 {
 275                         bool is_array = false;
 276                         string identifier = name;
 277                         if (name [name.Length - 1] == ']') {
 278                                 string tmp = name.Substring (0, name.Length - 1).Trim (wsChars);
 279                                 if (tmp [tmp.Length - 1] == '[') {
 280                                         identifier = tmp.Substring (0, tmp.Length - 1).Trim (wsChars);
 281                                         is_array = true;
 282                                 }
 283                         }
 284                         Type t = FindDocumentedTypeNonArray (mc, identifier, ds, cref);
 285                         if (t != null && is_array)
 286                                 t = Array.CreateInstance (t, 0).GetType ();
 287                         return t;
 288                 }
 289
 290                 private static Type FindDocumentedTypeNonArray (MemberCore mc,
 291                         string identifier, DeclSpace ds, string cref)
 292                 {
 293                         switch (identifier) {
 294                         case "int":
 295                                 return TypeManager.int32_type;
 296                         case "uint":
 297                                 return TypeManager.uint32_type;
 298                         case "short":
 299                                 return TypeManager.short_type;;
 300                         case "ushort":
 301                                 return TypeManager.ushort_type;
 302                         case "long":
 303                                 return TypeManager.int64_type;
 304                         case "ulong":
 305                                 return TypeManager.uint64_type;;
 306                         case "float":
 307                                 return TypeManager.float_type;;
 308                         case "double":
 309                                 return TypeManager.double_type;
 310                         case "char":
 311                                 return TypeManager.char_type;;
 312                         case "decimal":
 313                                 return TypeManager.decimal_type;;
 314                         case "byte":
 315                                 return TypeManager.byte_type;;
 316                         case "sbyte":
 317                                 return TypeManager.sbyte_type;;
 318                         case "object":
 319                                 return TypeManager.object_type;;
 320                         case "bool":
 321                                 return TypeManager.bool_type;;
 322                         case "string":
 323                                 return TypeManager.string_type;;
 324                         case "void":
 325                                 return TypeManager.void_type;;
 326                         }
 327                         FullNamedExpression e = ds.LookupNamespaceOrType (identifier, mc.Location, false);
 328                         if (e != null) {
 329                                 if (!(e is TypeExpr))
 330                                         return null;
 331                                 return e.Type;
 332                         }
 333                         int index = identifier.LastIndexOf ('.');
 334                         if (index < 0)
 335                                 return null;
 336                         int warn;
 337                         Type parent = FindDocumentedType (mc, identifier.Substring (0, index), ds, cref);
 338                         if (parent == null)
 339                                 return null;
 340                         // no need to detect warning 419 here
 341                         return FindDocumentedMember (mc, parent,
 342                                 identifier.Substring (index + 1),
 343                                 null, ds, out warn, cref, false, null).Member as Type;
 344                 }
 345
 346                 private static MemberInfo [] empty_member_infos =
 347                         new MemberInfo [0];
 348
 349                 private static MemberInfo [] FindMethodBase (Type type,
 350                         BindingFlags binding_flags, MethodSignature signature)
 351                 {
 352                         MemberList ml = TypeManager.FindMembers (
 353                                 type,
 354                                 MemberTypes.Constructor | MemberTypes.Method | MemberTypes.Property | MemberTypes.Custom,
 355                                 binding_flags,
 356                                 MethodSignature.method_signature_filter,
 357                                 signature);
 358                         if (ml == null)
 359                                 return empty_member_infos;
 360
 361                         return FilterOverridenMembersOut ((MemberInfo []) ml);
 362                 }
 363
 364                 static bool IsOverride (PropertyInfo deriv_prop, PropertyInfo base_prop)
 365                 {
 366                         if (!MethodGroupExpr.IsAncestralType (base_prop.DeclaringType, deriv_prop.DeclaringType))
 367                                 return false;
 368
 369                         Type [] deriv_pd = TypeManager.GetArgumentTypes (deriv_prop);
 370                         Type [] base_pd = TypeManager.GetArgumentTypes (base_prop);
 371
 372                         if (deriv_pd.Length != base_pd.Length)
 373                                 return false;
 374
 375                         for (int j = 0; j < deriv_pd.Length; ++j) {
 376                                 if (deriv_pd [j] != base_pd [j])
 377                                         return false;
 378                                 Type ct = TypeManager.TypeToCoreType (deriv_pd [j]);
 379                                 Type bt = TypeManager.TypeToCoreType (base_pd [j]);
 380
 381                                 if (ct != bt)
 382                                         return false;
 383                         }
 384
 385                         return true;
 386                 }
 387
 388                 private static MemberInfo [] FilterOverridenMembersOut (
 389                         MemberInfo [] ml)
 390                 {
 391                         if (ml == null)
 392                                 return empty_member_infos;
 393
 394                         ArrayList al = new ArrayList (ml.Length);
 395                         for (int i = 0; i < ml.Length; i++) {
 396                                 MethodBase mx = ml [i] as MethodBase;
 397                                 PropertyInfo px = ml [i] as PropertyInfo;
 398                                 if (mx != null || px != null) {
 399                                         bool overriden = false;
 400                                         for (int j = 0; j < ml.Length; j++) {
 401                                                 if (j == i)
 402                                                         continue;
 403                                                 MethodBase my = ml [j] as MethodBase;
 404                                                 if (mx != null && my != null &&
 405                                                         MethodGroupExpr.IsOverride (my, mx)) {
 406                                                         overriden = true;
 407                                                         break;
 408                                                 }
 409                                                 else if (mx != null)
 410                                                         continue;
 411                                                 PropertyInfo py = ml [j] as PropertyInfo;
 412                                                 if (px != null && py != null &&
 413                                                         IsOverride (py, px)) {
 414                                                         overriden = true;
 415                                                         break;
 416                                                 }
 417                                         }
 418                                         if (overriden)
 419                                                 continue;
 420                                 }
 421                                 al.Add (ml [i]);
 422                         }
 423                         return al.ToArray (typeof (MemberInfo)) as MemberInfo [];
 424                 }
 425
 426                 struct FoundMember
 427                 {
 428                         public static FoundMember Empty = new FoundMember (true);
 429
 430                         public bool IsEmpty;
 431                         public readonly MemberInfo Member;
 432                         public readonly Type Type;
 433
 434                         public FoundMember (bool regardless_of_this_value_its_empty)
 435                         {
 436                                 IsEmpty = true;
 437                                 Member = null;
 438                                 Type = null;
 439                         }
 440
 441                         public FoundMember (Type found_type, MemberInfo member)
 442                         {
 443                                 IsEmpty = false;
 444                                 Type = found_type;
 445                                 Member = member;
 446                         }
 447                 }
 448
 449                 //
 450                 // Returns a MemberInfo that is referenced in XML documentation
 451                 // (by "see" or "seealso" elements).
 452                 //
 453                 private static FoundMember FindDocumentedMember (MemberCore mc,
 454                         Type type, string member_name, Type [] param_list,
 455                         DeclSpace ds, out int warning_type, string cref,
 456                         bool warn419, string name_for_error)
 457                 {
 458                         for (; type != null; type = type.DeclaringType) {
 459                                 MemberInfo mi = FindDocumentedMemberNoNest (
 460                                         mc, type, member_name, param_list, ds,
 461                                         out warning_type, cref, warn419,
 462                                         name_for_error);
 463                                 if (mi != null)
 464                                         return new FoundMember (type, mi);
 465                         }
 466                         warning_type = 0;
 467                         return FoundMember.Empty;
 468                 }
 469
 470                 private static MemberInfo FindDocumentedMemberNoNest (
 471                         MemberCore mc, Type type, string member_name,
 472                         Type [] param_list, DeclSpace ds, out int warning_type,
 473                         string cref, bool warn419, string name_for_error)
 474                 {
 475                         warning_type = 0;
 476                         MemberInfo [] mis;
 477
 478                         if (param_list == null) {
 479                                 // search for fields/events etc.
 480                                 mis = TypeManager.MemberLookup (type, null,
 481                                         type, MemberTypes.All,
 482                                         BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Static | BindingFlags.Instance,
 483                                         member_name, null);
 484                                 mis = FilterOverridenMembersOut (mis);
 485                                 if (mis == null || mis.Length == 0)
 486                                         return null;
 487                                 if (warn419 && IsAmbiguous (mis))
 488                                         Report419 (mc, name_for_error, mis);
 489                                 return mis [0];
 490                         }
 491
 492                         MethodSignature msig = new MethodSignature (member_name, null, param_list);
 493                         mis = FindMethodBase (type,
 494                                 BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Static | BindingFlags.Instance,
 495                                 msig);
 496
 497                         if (warn419 && mis.Length > 0) {
 498                                 if (IsAmbiguous (mis))
 499                                         Report419 (mc, name_for_error, mis);
 500                                 return mis [0];
 501                         }
 502
 503                         // search for operators (whose parameters exactly
 504                         // matches with the list) and possibly report CS1581.
 505                         string oper = null;
 506                         string return_type_name = null;
 507                         if (member_name.StartsWith ("implicit operator ")) {
 508                                 Operator.GetMetadataName (Operator.OpType.Implicit);
 509                                 return_type_name = member_name.Substring (18).Trim (wsChars);
 510                         }
 511                         else if (member_name.StartsWith ("explicit operator ")) {
 512                                 oper = Operator.GetMetadataName (Operator.OpType.Explicit);
 513                                 return_type_name = member_name.Substring (18).Trim (wsChars);
 514                         }
 515                         else if (member_name.StartsWith ("operator ")) {
 516                                 oper = member_name.Substring (9).Trim (wsChars);
 517                                 switch (oper) {
 518                                 // either unary or binary
 519                                 case "+":
 520                                         oper = param_list.Length == 2 ?
 521                                                 Operator.GetMetadataName (Operator.OpType.Addition) :
 522                                                 Operator.GetMetadataName (Operator.OpType.UnaryPlus);
 523                                         break;
 524                                 case "-":
 525                                         oper = param_list.Length == 2 ?
 526                                                 Operator.GetMetadataName (Operator.OpType.Subtraction) :
 527                                                 Operator.GetMetadataName (Operator.OpType.UnaryNegation);
 528                                         break;
 529                                 default:
 530                                         oper = Operator.GetMetadataName (oper);
 531                                         if (oper != null)
 532                                                 break;
 533
 534                                         warning_type = 1584;
 535                                         Report.Warning (1020, 1, mc.Location, "Overloadable {0} operator is expected", param_list.Length == 2 ? "binary" : "unary");
 536                                         Report.Warning (1584, 1, mc.Location, "XML comment on `{0}' has syntactically incorrect cref attribute `{1}'",
 537                                                 mc.GetSignatureForError (), cref);
 538                                         return null;
 539                                 }
 540                         }
 541                         // here we still don't consider return type (to
 542                         // detect CS1581 or CS1002+CS1584).
 543                         msig = new MethodSignature (oper, null, param_list);
 544
 545                         mis = FindMethodBase (type,
 546                                 BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Static | BindingFlags.Instance,
 547                                 msig);
 548                         if (mis.Length == 0)
 549                                 return null; // CS1574
 550                         MemberInfo mi = mis [0];
 551                         Type expected = mi is MethodInfo ?
 552                                 ((MethodInfo) mi).ReturnType :
 553                                 mi is PropertyInfo ?
 554                                 ((PropertyInfo) mi).PropertyType :
 555                                 null;
 556                         if (return_type_name != null) {
 557                                 Type returnType = FindDocumentedType (mc, return_type_name, ds, cref);
 558                                 if (returnType == null || returnType != expected) {
 559                                         warning_type = 1581;
 560                                         Report.Warning (1581, 1, mc.Location, "Invalid return type in XML comment cref attribute `{0}'", cref);
 561                                         return null;
 562                                 }
 563                         }
 564                         return mis [0];
 565                 }
 566
 567                 private static bool IsAmbiguous (MemberInfo [] members)
 568                 {
 569                         if (members.Length < 2)
 570                                 return false;
 571                         if (members.Length > 2)
 572                                 return true;
 573                         if (members [0] is EventInfo && members [1] is FieldInfo)
 574                                 return false;
 575                         if (members [1] is EventInfo && members [0] is FieldInfo)
 576                                 return false;
 577                         return true;
 578                 }
 579
 580                 //
 581                 // Processes "see" or "seealso" elements.
 582                 // Checks cref attribute.
 583                 //
 584                 private static void HandleXrefCommon (MemberCore mc,
 585                         DeclSpace ds, XmlElement xref)
 586                 {
 587                         string cref = xref.GetAttribute ("cref").Trim (wsChars);
 588                         // when, XmlReader, "if (cref == null)"
 589                         if (!xref.HasAttribute ("cref"))
 590                                 return;
 591                         if (cref.Length == 0)
 592                                 Report.Warning (1001, 1, mc.Location, "Identifier expected");
 593                                 // ... and continue until CS1584.
 594
 595                         string signature; // "x:" are stripped
 596                         string name; // method invokation "(...)" are removed
 597                         string parameters; // method parameter list
 598
 599                         // When it found '?:' ('T:' 'M:' 'F:' 'P:' 'E:' etc.),
 600                         // MS ignores not only its member kind, but also
 601                         // the entire syntax correctness. Nor it also does
 602                         // type fullname resolution i.e. "T:List(int)" is kept
 603                         // as T:List(int), not
 604                         // T:System.Collections.Generic.List&lt;System.Int32&gt;
 605                         if (cref.Length > 2 && cref [1] == ':')
 606                                 return;
 607                         else
 608                                 signature = cref;
 609
 610                         // Also note that without "T:" any generic type
 611                         // indication fails.
 612
 613                         int parens_pos = signature.IndexOf ('(');
 614                         int brace_pos = parens_pos >= 0 ? -1 :
 615                                 signature.IndexOf ('[');
 616                         if (parens_pos > 0 && signature [signature.Length - 1] == ')') {
 617                                 name = signature.Substring (0, parens_pos).Trim (wsChars);
 618                                 parameters = signature.Substring (parens_pos + 1, signature.Length - parens_pos - 2).Trim (wsChars);
 619                         }
 620                         else if (brace_pos > 0 && signature [signature.Length - 1] == ']') {
 621                                 name = signature.Substring (0, brace_pos).Trim (wsChars);
 622                                 parameters = signature.Substring (brace_pos + 1, signature.Length - brace_pos - 2).Trim (wsChars);
 623                         }
 624                         else {
 625                                 name = signature;
 626                                 parameters = null;
 627                         }
 628                         Normalize (mc, ref name);
 629
 630                         string identifier = GetBodyIdentifierFromName (name);
 631
 632                         // Check if identifier is valid.
 633                         // This check is not necessary to mark as error, but
 634                         // csc specially reports CS1584 for wrong identifiers.
 635                         string [] name_elems = identifier.Split ('.');
 636                         for (int i = 0; i < name_elems.Length; i++) {
 637                                 string nameElem = GetBodyIdentifierFromName (name_elems [i]);
 638                                 if (i > 0)
 639                                         Normalize (mc, ref nameElem);
 640                                 if (!Tokenizer.IsValidIdentifier (nameElem)
 641                                         && nameElem.IndexOf ("operator") < 0) {
 642                                         Report.Warning (1584, 1, mc.Location, "XML comment on `{0}' has syntactically incorrect cref attribute `{1}'",
 643                                                 mc.GetSignatureForError (), cref);
 644                                         xref.SetAttribute ("cref", "!:" + signature);
 645                                         return;
 646                                 }
 647                         }
 648
 649                         // check if parameters are valid
 650                         Type [] parameter_types;
 651                         if (parameters == null)
 652                                 parameter_types = null;
 653                         else if (parameters.Length == 0)
 654                                 parameter_types = Type.EmptyTypes;
 655                         else {
 656                                 string [] param_list = parameters.Split (',');
 657                                 ArrayList plist = new ArrayList ();
 658                                 for (int i = 0; i < param_list.Length; i++) {
 659                                         string param_type_name = param_list [i].Trim (wsChars);
 660                                         Normalize (mc, ref param_type_name);
 661                                         Type param_type = FindDocumentedType (mc, param_type_name, ds, cref);
 662                                         if (param_type == null) {
 663                                                 Report.Warning (1580, 1, mc.Location, "Invalid type for parameter `{0}' in XML comment cref attribute `{1}'",
 664                                                         (i + 1).ToString (), cref);
 665                                                 return;
 666                                         }
 667                                         plist.Add (param_type);
 668                                 }
 669                                 parameter_types = plist.ToArray (typeof (Type)) as Type [];
 670                         }
 671
 672                         Type type = FindDocumentedType (mc, name, ds, cref);
 673                         if (type != null
 674                                 // delegate must not be referenced with args
 675                                 && (!TypeManager.IsDelegateType (type)
 676                                 || parameter_types == null)) {
 677                                 string result = GetSignatureForDoc (type)
 678                                         + (brace_pos < 0 ? String.Empty : signature.Substring (brace_pos));
 679                                 xref.SetAttribute ("cref", "T:" + result);
 680                                 return; // a type
 681                         }
 682
 683                         int period = name.LastIndexOf ('.');
 684                         if (period > 0) {
 685                                 string typeName = name.Substring (0, period);
 686                                 string member_name = name.Substring (period + 1);
 687                                 Normalize (mc, ref member_name);
 688                                 type = FindDocumentedType (mc, typeName, ds, cref);
 689                                 int warn_result;
 690                                 if (type != null) {
 691                                         FoundMember fm = FindDocumentedMember (mc, type, member_name, parameter_types, ds, out warn_result, cref, true, name);
 692                                         if (warn_result > 0)
 693                                                 return;
 694                                         if (!fm.IsEmpty) {
 695                                                 MemberInfo mi = fm.Member;
 696                                                 // we cannot use 'type' directly
 697                                                 // to get its name, since mi
 698                                                 // could be from DeclaringType
 699                                                 // for nested types.
 700                                                 xref.SetAttribute ("cref", GetMemberDocHead (mi.MemberType) + GetSignatureForDoc (fm.Type) + "." + member_name + GetParametersFormatted (mi));
 701                                                 return; // a member of a type
 702                                         }
 703                                 }
 704                         }
 705                         else {
 706                                 int warn_result;
 707                                 FoundMember fm = FindDocumentedMember (mc, ds.TypeBuilder, name, parameter_types, ds, out warn_result, cref, true, name);
 708                                 if (warn_result > 0)
 709                                         return;
 710                                 if (!fm.IsEmpty) {
 711                                         MemberInfo mi = fm.Member;
 712                                         // we cannot use 'type' directly
 713                                         // to get its name, since mi
 714                                         // could be from DeclaringType
 715                                         // for nested types.
 716                                         xref.SetAttribute ("cref", GetMemberDocHead (mi.MemberType) + GetSignatureForDoc (fm.Type) + "." + name + GetParametersFormatted (mi));
 717                                         return; // local member name
 718                                 }
 719                         }
 720
 721                         // It still might be part of namespace name.
 722                         Namespace ns = ds.NamespaceEntry.NS.GetNamespace (name, false);
 723                         if (ns != null) {
 724                                 xref.SetAttribute ("cref", "N:" + ns.GetSignatureForError ());
 725                                 return; // a namespace
 726                         }
 727                         if (RootNamespace.Global.IsNamespace (name)) {
 728                                 xref.SetAttribute ("cref", "N:" + name);
 729                                 return; // a namespace
 730                         }
 731
 732                         Report.Warning (1574, 1, mc.Location, "XML comment on `{0}' has cref attribute `{1}' that could not be resolved",
 733                                 mc.GetSignatureForError (), cref);
 734
 735                         xref.SetAttribute ("cref", "!:" + name);
 736                 }
 737
 738                 static string GetParametersFormatted (MemberInfo mi)
 739                 {
 740                         MethodBase mb = mi as MethodBase;
 741                         bool is_setter = false;
 742                         PropertyInfo pi = mi as PropertyInfo;
 743                         if (pi != null) {
 744                                 mb = pi.GetGetMethod ();
 745                                 if (mb == null) {
 746                                         is_setter = true;
 747                                         mb = pi.GetSetMethod ();
 748                                 }
 749                         }
 750                         if (mb == null)
 751                                 return String.Empty;
 752
 753                         ParameterData parameters = TypeManager.GetParameterData (mb);
 754                         if (parameters == null || parameters.Count == 0)
 755                                 return String.Empty;
 756
 757                         StringBuilder sb = new StringBuilder ();
 758                         sb.Append ('(');
 759                         for (int i = 0; i < parameters.Count; i++) {
 760                                 if (is_setter && i + 1 == parameters.Count)
 761                                         break; // skip "value".
 762                                 if (i > 0)
 763                                         sb.Append (',');
 764                                 Type t = parameters.ParameterType (i);
 765                                 sb.Append (GetSignatureForDoc (t));
 766                         }
 767                         sb.Append (')');
 768                         return sb.ToString ();
 769                 }
 770
 771                 static string GetBodyIdentifierFromName (string name)
 772                 {
 773                         string identifier = name;
 774
 775                         if (name.Length > 0 && name [name.Length - 1] == ']') {
 776                                 string tmp = name.Substring (0, name.Length - 1).Trim (wsChars);
 777                                 int last = tmp.LastIndexOf ('[');
 778                                 if (last > 0)
 779                                         identifier = tmp.Substring (0, last).Trim (wsChars);
 780                         }
 781
 782                         return identifier;
 783                 }
 784
 785                 static void Report419 (MemberCore mc, string member_name, MemberInfo [] mis)
 786                 {
 787                         Report.Warning (419, 3, mc.Location,
 788                                 "Ambiguous reference in cref attribute `{0}'. Assuming `{1}' but other overloads including `{2}' have also matched",
 789                                 member_name,
 790                                 TypeManager.GetFullNameSignature (mis [0]),
 791                                 TypeManager.GetFullNameSignature (mis [1]));
 792                 }
 793
 794                 //
 795                 // Get a prefix from member type for XML documentation (used
 796                 // to formalize cref target name).
 797                 //
 798                 static string GetMemberDocHead (MemberTypes type)
 799                 {
 800                         switch (type) {
 801                         case MemberTypes.Constructor:
 802                         case MemberTypes.Method:
 803                                 return "M:";
 804                         case MemberTypes.Event:
 805                                 return "E:";
 806                         case MemberTypes.Field:
 807                                 return "F:";
 808                         case MemberTypes.NestedType:
 809                         case MemberTypes.TypeInfo:
 810                                 return "T:";
 811                         case MemberTypes.Property:
 812                                 return "P:";
 813                         }
 814                         return "!:";
 815                 }
 816
 817                 // MethodCore
 818
 819                 //
 820                 // Returns a string that represents the signature for this
 821                 // member which should be used in XML documentation.
 822                 //
 823                 public static string GetMethodDocCommentName (MemberCore mc, Parameters parameters, DeclSpace ds)
 824                 {
 825                         Parameter [] plist = parameters.FixedParameters;
 826                         string paramSpec = String.Empty;
 827                         if (plist != null) {
 828                                 StringBuilder psb = new StringBuilder ();
 829                                 foreach (Parameter p in plist) {
 830                                         psb.Append (psb.Length != 0 ? "," : "(");
 831                                         psb.Append (GetSignatureForDoc (p.ParameterType));
 832                                         if ((p.ModFlags & Parameter.Modifier.ISBYREF) != 0)
 833                                                 psb.Append ('@');
 834                                 }
 835                                 paramSpec = psb.ToString ();
 836                         }
 837
 838                         if (paramSpec.Length > 0)
 839                                 paramSpec += ")";
 840
 841                         string name = mc is Constructor ? "#ctor" : mc.Name;
 842 #if GMCS_SOURCE
 843                         if (mc.MemberName.IsGeneric)
 844                                 name += "``" + mc.MemberName.CountTypeArguments;
 845 #endif
 846                         string suffix = String.Empty;
 847                         Operator op = mc as Operator;
 848                         if (op != null) {
 849                                 switch (op.OperatorType) {
 850                                 case Operator.OpType.Implicit:
 851                                 case Operator.OpType.Explicit:
 852                                         suffix = "~" + GetSignatureForDoc (op.MethodBuilder.ReturnType);
 853                                         break;
 854                                 }
 855                         }
 856                         return String.Concat (mc.DocCommentHeader, ds.Name, ".", name, paramSpec, suffix);
 857                 }
 858
 859                 static string GetSignatureForDoc (Type type)
 860                 {
 861 #if GMCS_SOURCE
 862                         if (TypeManager.IsGenericParameter (type))
 863                                 return (type.DeclaringMethod != null ? "``" : "`") + TypeManager.GenericParameterPosition (type);
 864
 865                         if (TypeManager.IsGenericType (type)) {
 866                                 string g = type.Namespace;
 867                                 if (g != null && g.Length > 0)
 868                                         g += '.';
 869                                 int idx = type.Name.LastIndexOf ('`');
 870                                 g += (idx < 0 ? type.Name : type.Name.Substring (0, idx)) + '{';
 871                                 int argpos = 0;
 872                                 foreach (Type t in type.GetGenericArguments ())
 873                                         g += (argpos++ > 0 ? "," : String.Empty) + GetSignatureForDoc (t);
 874                                 g += '}';
 875                                 return g;
 876                         }
 877 #endif
 878
 879                         string name = type.FullName != null ? type.FullName : type.Name;
 880                         return name.Replace ("+", ".").Replace ('&', '@');
 881                 }
 882
 883                 //
 884                 // Raised (and passed an XmlElement that contains the comment)
 885                 // when GenerateDocComment is writing documentation expectedly.
 886                 //
 887                 // FIXME: with a few effort, it could be done with XmlReader,
 888                 // that means removal of DOM use.
 889                 //
 890                 internal static void OnMethodGenerateDocComment (
 891                         MethodCore mc, XmlElement el)
 892                 {
 893                         Hashtable paramTags = new Hashtable ();
 894                         foreach (XmlElement pelem in el.SelectNodes ("param")) {
 895                                 int i;
 896                                 string xname = pelem.GetAttribute ("name");
 897                                 if (xname.Length == 0)
 898                                         continue; // really? but MS looks doing so
 899                                 if (xname != "" && mc.Parameters.GetParameterByName (xname, out i) == null)
 900                                         Report.Warning (1572, 2, mc.Location, "XML comment on `{0}' has a param tag for `{1}', but there is no parameter by that name",
 901                                                 mc.GetSignatureForError (), xname);
 902                                 else if (paramTags [xname] != null)
 903                                         Report.Warning (1571, 2, mc.Location, "XML comment on `{0}' has a duplicate param tag for `{1}'",
 904                                                 mc.GetSignatureForError (), xname);
 905                                 paramTags [xname] = xname;
 906                         }
 907                         Parameter [] plist = mc.Parameters.FixedParameters;
 908                         foreach (Parameter p in plist) {
 909                                 if (paramTags.Count > 0 && paramTags [p.Name] == null)
 910                                         Report.Warning (1573, 4, mc.Location, "Parameter `{0}' has no matching param tag in the XML comment for `{1}'",
 911                                                 p.Name, mc.GetSignatureForError ());
 912                         }
 913                 }
 914
 915                 private static void Normalize (MemberCore mc, ref string name)
 916                 {
 917                         if (name.Length > 0 && name [0] == '@')
 918                                 name = name.Substring (1);
 919                         else if (name == "this")
 920                                 name = "Item";
 921                         else if (Tokenizer.IsKeyword (name) && !IsTypeName (name))
 922                                 Report.Warning (1041, 1, mc.Location, "Identifier expected. `{0}' is a keyword", name);
 923                 }
 924
 925                 private static bool IsTypeName (string name)
 926                 {
 927                         switch (name) {
 928                         case "bool":
 929                         case "byte":
 930                         case "char":
 931                         case "decimal":
 932                         case "double":
 933                         case "float":
 934                         case "int":
 935                         case "long":
 936                         case "object":
 937                         case "sbyte":
 938                         case "short":
 939                         case "string":
 940                         case "uint":
 941                         case "ulong":
 942                         case "ushort":
 943                         case "void":
 944                                 return true;
 945                         }
 946                         return false;
 947                 }
 948         }
 949
 950         //
 951         // Implements XML documentation generation.
 952         //
 953         public class Documentation
 954         {
 955                 public Documentation (string xml_output_filename)
 956                 {
 957                         docfilename = xml_output_filename;
 958                         XmlDocumentation = new XmlDocument ();
 959                         XmlDocumentation.PreserveWhitespace = false;
 960                 }
 961
 962                 private string docfilename;
 963
 964                 //
 965                 // Used to create element which helps well-formedness checking.
 966                 //
 967                 public XmlDocument XmlDocumentation;
 968
 969                 //
 970                 // The output for XML documentation.
 971                 //
 972                 public XmlWriter XmlCommentOutput;
 973
 974                 //
 975                 // Stores XmlDocuments that are included in XML documentation.
 976                 // Keys are included filenames, values are XmlDocuments.
 977                 //
 978                 public Hashtable StoredDocuments = new Hashtable ();
 979
 980                 //
 981                 // Outputs XML documentation comment from tokenized comments.
 982                 //
 983                 public bool OutputDocComment (string asmfilename)
 984                 {
 985                         XmlTextWriter w = null;
 986                         try {
 987                                 w = new XmlTextWriter (docfilename, null);
 988                                 w.Indentation = 4;
 989                                 w.Formatting = Formatting.Indented;
 990                                 w.WriteStartDocument ();
 991                                 w.WriteStartElement ("doc");
 992                                 w.WriteStartElement ("assembly");
 993                                 w.WriteStartElement ("name");
 994                                 w.WriteString (Path.ChangeExtension (asmfilename, null));
 995                                 w.WriteEndElement (); // name
 996                                 w.WriteEndElement (); // assembly
 997                                 w.WriteStartElement ("members");
 998                                 XmlCommentOutput = w;
 999                                 GenerateDocComment ();
1000                                 w.WriteFullEndElement (); // members
1001                                 w.WriteEndElement ();
1002                                 w.WriteWhitespace (Environment.NewLine);
1003                                 w.WriteEndDocument ();
1004                                 return true;
1005                         } catch (Exception ex) {
1006                                 Report.Error (1569, "Error generating XML documentation file `{0}' (`{1}')", docfilename, ex.Message);
1007                                 return false;
1008                         } finally {
1009                                 if (w != null)
1010                                         w.Close ();
1011                         }
1012                 }
1013
1014                 //
1015                 // Fixes full type name of each documented types/members up.
1016                 //
1017                 public void GenerateDocComment ()
1018                 {
1019                         TypeContainer root = RootContext.ToplevelTypes;
1020
1021                         if (root.Types != null)
1022                                 foreach (TypeContainer tc in root.Types)
1023                                         DocUtil.GenerateTypeDocComment (tc, null);
1024
1025                         if (root.Delegates != null)
1026                                 foreach (Delegate d in root.Delegates)
1027                                         DocUtil.GenerateDocComment (d, null);
1028                 }
1029         }
1030 }
1031 #endif