mcs/mcs/doc.cs

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