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