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 #if ! BOOTSTRAP_WITH_OLDLIB
  13 using System;
  14 using System.Collections;
  15 using System.Collections.Specialized;
  16 using System.IO;
  17 using System.Reflection;
  18 using System.Reflection.Emit;
  19 using System.Runtime.CompilerServices;
  20 using System.Runtime.InteropServices;
  21 using System.Security;
  22 using System.Security.Permissions;
  23 using System.Text;
  24 using System.Xml;
  25
  26 using Mono.CompilerServices.SymbolWriter;
  27
  28 namespace Mono.CSharp {
  29
  30         //
  31         // Support class for XML documentation.
  32         //
  33 #if NET_2_0
  34         static
  35 #else
  36         abstract
  37 #endif
  38         public class DocUtil
  39         {
  40 #if !NET_2_0
  41                 private DocUtil () {}
  42 #endif
  43                 // TypeContainer
  44
  45                 //
  46                 // Generates xml doc comments (if any), and if required,
  47                 // handle warning report.
  48                 //
  49                 internal static void GenerateTypeDocComment (TypeContainer t,
  50                         DeclSpace ds)
  51                 {
  52                         GenerateDocComment (t, ds);
  53
  54                         if (t.DefaultStaticConstructor != null)
  55                                 t.DefaultStaticConstructor.GenerateDocComment (t);
  56
  57                         if (t.InstanceConstructors != null)
  58                                 foreach (Constructor c in t.InstanceConstructors)
  59                                         c.GenerateDocComment (t);
  60
  61                         if (t.Types != null)
  62                                 foreach (TypeContainer tc in t.Types)
  63                                         tc.GenerateDocComment (t);
  64
  65                         if (t.Enums != null)
  66                                 foreach (Enum en in t.Enums)
  67                                         en.GenerateDocComment (t);
  68
  69                         if (t.Constants != null)
  70                                 foreach (Const c in t.Constants)
  71                                         c.GenerateDocComment (t);
  72
  73                         if (t.Fields != null)
  74                                 foreach (FieldBase f in t.Fields)
  75                                         f.GenerateDocComment (t);
  76
  77                         if (t.Events != null)
  78                                 foreach (Event e in t.Events)
  79                                         e.GenerateDocComment (t);
  80
  81                         if (t.Indexers != null)
  82                                 foreach (Indexer ix in t.Indexers)
  83                                         ix.GenerateDocComment (t);
  84
  85                         if (t.Properties != null)
  86                                 foreach (Property p in t.Properties)
  87                                         p.GenerateDocComment (t);
  88
  89                         if (t.Methods != null)
  90                                 foreach (Method m in t.Methods)
  91                                         m.GenerateDocComment (t);
  92
  93                         if (t.Operators != null)
  94                                 foreach (Operator o in t.Operators)
  95                                         o.GenerateDocComment (t);
  96                 }
  97
  98                 // MemberCore
  99                 private static readonly string lineHead =
 100                         Environment.NewLine + "            ";
 101
 102                 private static XmlNode GetDocCommentNode (MemberCore mc,
 103                         string name)
 104                 {
 105                         // FIXME: It could be even optimizable as not
 106                         // to use XmlDocument. But anyways the nodes
 107                         // are not kept in memory.
 108                         XmlDocument doc = RootContext.Documentation.XmlDocumentation;
 109                         try {
 110                                 XmlElement el = doc.CreateElement ("member");
 111                                 el.SetAttribute ("name", name);
 112                                 string normalized = mc.DocComment;
 113                                 el.InnerXml = normalized;
 114                                 // csc keeps lines as written in the sources
 115                                 // and inserts formatting indentation (which
 116                                 // is different from XmlTextWriter.Formatting
 117                                 // one), but when a start tag contains an
 118                                 // endline, it joins the next line. We don't
 119                                 // have to follow such a hacky behavior.
 120                                 string [] split =
 121                                         normalized.Split ('\n');
 122                                 int j = 0;
 123                                 for (int i = 0; i < split.Length; i++) {
 124                                         string s = split [i].TrimEnd ();
 125                                         if (s.Length > 0)
 126                                                 split [j++] = s;
 127                                 }
 128                                 el.InnerXml = lineHead + String.Join (
 129                                         lineHead, split, 0, j);
 130                                 return el;
 131                         } catch (XmlException ex) {
 132                                 Report.Warning (1570, 1, mc.Location, "XML comment on `{0}' has non-well-formed XML ({1})", name, ex.Message);
 133                                 XmlComment com = doc.CreateComment (String.Format ("FIXME: Invalid documentation markup was found for member {0}", name));
 134                                 return com;
 135                         }
 136                 }
 137
 138                 //
 139                 // Generates xml doc comments (if any), and if required,
 140                 // handle warning report.
 141                 //
 142                 internal static void GenerateDocComment (MemberCore mc,
 143                         DeclSpace ds)
 144                 {
 145                         if (mc.DocComment != null) {
 146                                 string name = mc.GetDocCommentName (ds);
 147
 148                                 XmlNode n = GetDocCommentNode (mc, name);
 149
 150                                 XmlElement el = n as XmlElement;
 151                                 if (el != null) {
 152                                         mc.OnGenerateDocComment (el);
 153
 154                                         // FIXME: it could be done with XmlReader
 155                                         XmlNodeList nl = n.SelectNodes (".//include");
 156                                         if (nl.Count > 0) {
 157                                                 // It could result in current node removal, so prepare another list to iterate.
 158                                                 ArrayList al = new ArrayList (nl.Count);
 159                                                 foreach (XmlNode inc in nl)
 160                                                         al.Add (inc);
 161                                                 foreach (XmlElement inc in al)
 162                                                         if (!HandleInclude (mc, inc))
 163                                                                 inc.ParentNode.RemoveChild (inc);
 164                                         }
 165
 166                                         // FIXME: it could be done with XmlReader
 167                                         DeclSpace dsTarget = mc as DeclSpace;
 168                                         if (dsTarget == null)
 169                                                 dsTarget = ds;
 170
 171                                         foreach (XmlElement see in n.SelectNodes (".//see"))
 172                                                 HandleSee (mc, dsTarget, see);
 173                                         foreach (XmlElement seealso in n.SelectNodes (".//seealso"))
 174                                                 HandleSeeAlso (mc, dsTarget, seealso);
 175                                         foreach (XmlElement see in n.SelectNodes (".//exception"))
 176                                                 HandleException (mc, dsTarget, see);
 177                                 }
 178
 179                                 n.WriteTo (RootContext.Documentation.XmlCommentOutput);
 180                         }
 181                         else if (mc.IsExposedFromAssembly ()) {
 182                                 Constructor c = mc as Constructor;
 183                                 if (c == null || !c.IsDefault ())
 184                                         Report.Warning (1591, 4, mc.Location,
 185                                                 "Missing XML comment for publicly visible type or member `{0}'", mc.GetSignatureForError ());
 186                         }
 187                 }
 188
 189                 //
 190                 // Processes "include" element. Check included file and
 191                 // embed the document content inside this documentation node.
 192                 //
 193                 private static bool HandleInclude (MemberCore mc, XmlElement el)
 194                 {
 195                         bool keepIncludeNode = false;
 196                         string file = el.GetAttribute ("file");
 197                         string path = el.GetAttribute ("path");
 198                         if (file == "") {
 199                                 Report.Warning (1590, 1, mc.Location, "Invalid XML `include' element. Missing `file' attribute");
 200                                 el.ParentNode.InsertBefore (el.OwnerDocument.CreateComment (" Include tag is invalid "), el);
 201                                 keepIncludeNode = true;
 202                         }
 203                         else if (path.Length == 0) {
 204                                 Report.Warning (1590, 1, mc.Location, "Invalid XML `include' element. Missing `path' attribute");
 205                                 el.ParentNode.InsertBefore (el.OwnerDocument.CreateComment (" Include tag is invalid "), el);
 206                                 keepIncludeNode = true;
 207                         }
 208                         else {
 209                                 XmlDocument doc = RootContext.Documentation.StoredDocuments [file] as XmlDocument;
 210                                 if (doc == null) {
 211                                         try {
 212                                                 doc = new XmlDocument ();
 213                                                 doc.Load (file);
 214                                                 RootContext.Documentation.StoredDocuments.Add (file, doc);
 215                                         } catch (Exception) {
 216                                                 el.ParentNode.InsertBefore (el.OwnerDocument.CreateComment (String.Format (" Badly formed XML in at comment file `{0}': cannot be included ", file)), el);
 217                                                 Report.Warning (1592, 1, mc.Location, "Badly formed XML in included comments file -- `{0}'", file);
 218                                         }
 219                                 }
 220                                 if (doc != null) {
 221                                         try {
 222                                                 XmlNodeList nl = doc.SelectNodes (path);
 223                                                 if (nl.Count == 0) {
 224                                                         el.ParentNode.InsertBefore (el.OwnerDocument.CreateComment (" No matching elements were found for the include tag embedded here. "), el);
 225
 226                                                         keepIncludeNode = true;
 227                                                 }
 228                                                 foreach (XmlNode n in nl)
 229                                                         el.ParentNode.InsertBefore (el.OwnerDocument.ImportNode (n, true), el);
 230                                         } catch (Exception ex) {
 231                                                 el.ParentNode.InsertBefore (el.OwnerDocument.CreateComment (" Failed to insert some or all of included XML "), el);
 232                                                 Report.Warning (1589, 1, mc.Location, "Unable to include XML fragment `{0}' of file `{1}' ({2})", path, file, ex.Message);
 233                                         }
 234                                 }
 235                         }
 236                         return keepIncludeNode;
 237                 }
 238
 239                 //
 240                 // Handles <see> elements.
 241                 //
 242                 private static void HandleSee (MemberCore mc,
 243                         DeclSpace ds, XmlElement see)
 244                 {
 245                         HandleXrefCommon (mc, ds, see);
 246                 }
 247
 248                 //
 249                 // Handles <seealso> elements.
 250                 //
 251                 private static void HandleSeeAlso (MemberCore mc,
 252                         DeclSpace ds, XmlElement seealso)
 253                 {
 254                         HandleXrefCommon (mc, ds, seealso);
 255                 }
 256
 257                 //
 258                 // Handles <exception> elements.
 259                 //
 260                 private static void HandleException (MemberCore mc,
 261                         DeclSpace ds, XmlElement seealso)
 262                 {
 263                         HandleXrefCommon (mc, ds, seealso);
 264                 }
 265
 266                 static readonly char [] wsChars =
 267                         new char [] {' ', '\t', '\n', '\r'};
 268
 269                 //
 270                 // returns a full runtime type name from a name which might
 271                 // be C# specific type name.
 272                 //
 273                 private static Type FindDocumentedType (MemberCore mc, string name, DeclSpace ds, string cref)
 274                 {
 275                         bool isArray = false;
 276                         string identifier = name;
 277                         if (name [name.Length - 1] == ']') {
 278                                 string tmp = name.Substring (0, name.Length - 1).Trim (wsChars);
 279                                 if (tmp [tmp.Length - 1] == '[') {
 280                                         identifier = tmp.Substring (0, tmp.Length - 1).Trim (wsChars);
 281                                         isArray = true;
 282                                 }
 283                         }
 284                         Type t = FindDocumentedTypeNonArray (mc, identifier, ds, cref);
 285                         if (t != null && isArray)
 286                                 t = Array.CreateInstance (t, 0).GetType ();
 287                         return t;
 288                 }
 289
 290                 private static Type FindDocumentedTypeNonArray (MemberCore mc,
 291                         string identifier, DeclSpace ds, string cref)
 292                 {
 293                         switch (identifier) {
 294                         case "int":
 295                                 return typeof (int);
 296                         case "uint":
 297                                 return typeof (uint);
 298                         case "short":
 299                                 return typeof (short);
 300                         case "ushort":
 301                                 return typeof (ushort);
 302                         case "long":
 303                                 return typeof (long);
 304                         case "ulong":
 305                                 return typeof (ulong);
 306                         case "float":
 307                                 return typeof (float);
 308                         case "double":
 309                                 return typeof (double);
 310                         case "char":
 311                                 return typeof (char);
 312                         case "decimal":
 313                                 return typeof (decimal);
 314                         case "byte":
 315                                 return typeof (byte);
 316                         case "sbyte":
 317                                 return typeof (sbyte);
 318                         case "object":
 319                                 return typeof (object);
 320                         case "bool":
 321                                 return typeof (bool);
 322                         case "string":
 323                                 return typeof (string);
 324                         case "void":
 325                                 return typeof (void);
 326                         }
 327                         FullNamedExpression e = ds.LookupType (identifier, mc.Location, false);
 328                         if (e != null) {
 329                                 if (!(e is TypeExpr))
 330                                         return null;
 331                                 return e.Type;
 332                         }
 333                         int index = identifier.LastIndexOf ('.');
 334                         if (index < 0)
 335                                 return null;
 336                         int warn;
 337                         Type parent = FindDocumentedType (mc, identifier.Substring (0, index), ds, cref);
 338                         if (parent == null)
 339                                 return null;
 340                         // no need to detect warning 419 here
 341                         return FindDocumentedMember (mc, parent,
 342                                 identifier.Substring (index + 1),
 343                                 null, ds, out warn, cref, false, null).Member as Type;
 344                 }
 345
 346                 private static MemberInfo [] empty_member_infos =
 347                         new MemberInfo [0];
 348
 349                 private static MemberInfo [] FindMethodBase (Type type,
 350                         BindingFlags bindingFlags, MethodSignature signature)
 351                 {
 352                         MemberList ml = TypeManager.FindMembers (
 353                                 type,
 354                                 MemberTypes.Constructor | MemberTypes.Method | MemberTypes.Property | MemberTypes.Custom,
 355                                 bindingFlags,
 356                                 MethodSignature.method_signature_filter,
 357                                 signature);
 358                         if (ml == null)
 359                                 return empty_member_infos;
 360
 361                         return FilterOverridenMembersOut ((MemberInfo []) ml);
 362                 }
 363
 364                 static bool IsOverride (PropertyInfo deriv_prop, PropertyInfo base_prop)
 365                 {
 366                         if (!Invocation.IsAncestralType (base_prop.DeclaringType, deriv_prop.DeclaringType))
 367                                 return false;
 368
 369                         Type [] deriv_pd = TypeManager.GetArgumentTypes (deriv_prop);
 370                         Type [] base_pd = TypeManager.GetArgumentTypes (base_prop);
 371
 372                         if (deriv_pd.Length != base_pd.Length)
 373                                 return false;
 374
 375                         for (int j = 0; j < deriv_pd.Length; ++j) {
 376                                 if (deriv_pd [j] != base_pd [j])
 377                                         return false;
 378                                 Type ct = TypeManager.TypeToCoreType (deriv_pd [j]);
 379                                 Type bt = TypeManager.TypeToCoreType (base_pd [j]);
 380
 381                                 if (ct != bt)
 382                                         return false;
 383                         }
 384
 385                         return true;
 386                 }
 387
 388                 private static MemberInfo [] FilterOverridenMembersOut (
 389                         MemberInfo [] ml)
 390                 {
 391                         if (ml == null)
 392                                 return empty_member_infos;
 393
 394                         ArrayList al = new ArrayList (ml.Length);
 395                         for (int i = 0; i < ml.Length; i++) {
 396                                 MethodBase mx = ml [i] as MethodBase;
 397                                 PropertyInfo px = ml [i] as PropertyInfo;
 398                                 if (mx != null || px != null) {
 399                                         bool overriden = false;
 400                                         for (int j = 0; j < ml.Length; j++) {
 401                                                 if (j == i)
 402                                                         continue;
 403                                                 MethodBase my = ml [j] as MethodBase;
 404                                                 if (mx != null && my != null &&
 405                                                         Invocation.IsOverride (my, mx)) {
 406                                                         overriden = true;
 407                                                         break;
 408                                                 }
 409                                                 else if (mx != null)
 410                                                         continue;
 411                                                 PropertyInfo py = ml [j] as PropertyInfo;
 412                                                 if (px != null && py != null &&
 413                                                         IsOverride (py, px)) {
 414                                                         overriden = true;
 415                                                         break;
 416                                                 }
 417                                         }
 418                                         if (overriden)
 419                                                 continue;
 420                                 }
 421                                 al.Add (ml [i]);
 422                         }
 423                         return al.ToArray (typeof (MemberInfo)) as MemberInfo [];
 424                 }
 425
 426                 struct FoundMember
 427                 {
 428                         public static FoundMember Empty = new FoundMember (true);
 429
 430                         public bool IsEmpty;
 431                         public readonly MemberInfo Member;
 432                         public readonly Type Type;
 433
 434                         public FoundMember (bool regardlessOfThisValueItsEmpty)
 435                         {
 436                                 IsEmpty = true;
 437                                 Member = null;
 438                                 Type = null;
 439                         }
 440
 441                         public FoundMember (Type foundType, MemberInfo member)
 442                         {
 443                                 IsEmpty = false;
 444                                 Type = foundType;
 445                                 Member = member;
 446                         }
 447                 }
 448
 449                 //
 450                 // Returns a MemberInfo that is referenced in XML documentation
 451                 // (by "see" or "seealso" elements).
 452                 //
 453                 private static FoundMember FindDocumentedMember (MemberCore mc,
 454                         Type type, string memberName, Type [] paramList,
 455                         DeclSpace ds, out int warningType, string cref,
 456                         bool warn419, string nameForError)
 457                 {
 458                         for (; type != null; type = type.DeclaringType) {
 459                                 MemberInfo mi = FindDocumentedMemberNoNest (
 460                                         mc, type, memberName, paramList, ds,
 461                                         out warningType, cref, warn419,
 462                                         nameForError);
 463                                 if (mi != null)
 464                                         return new FoundMember (type, mi);
 465                         }
 466                         warningType = 0;
 467                         return FoundMember.Empty;
 468                 }
 469
 470                 private static MemberInfo FindDocumentedMemberNoNest (
 471                         MemberCore mc, Type type, string memberName,
 472                         Type [] paramList, DeclSpace ds, out int warningType,
 473                         string cref, bool warn419, string nameForError)
 474                 {
 475                         warningType = 0;
 476                         MemberInfo [] mis;
 477
 478                         if (paramList == null) {
 479                                 // search for fields/events etc.
 480                                 mis = TypeManager.MemberLookup (type, null,
 481                                         type, MemberTypes.All,
 482                                         BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Static | BindingFlags.Instance,
 483                                         memberName, null);
 484                                 mis = FilterOverridenMembersOut (mis);
 485                                 if (mis == null || mis.Length == 0)
 486                                         return null;
 487                                 if (warn419 && IsAmbiguous (mis))
 488                                         Report419 (mc, nameForError, mis);
 489                                 return mis [0];
 490                         }
 491
 492                         MethodSignature msig = new MethodSignature (memberName, null, paramList);
 493                         mis = FindMethodBase (type,
 494                                 BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Static | BindingFlags.Instance,
 495                                 msig);
 496
 497                         if (warn419 && mis.Length > 0) {
 498                                 if (IsAmbiguous (mis))
 499                                         Report419 (mc, nameForError, mis);
 500                                 return mis [0];
 501                         }
 502
 503                         // search for operators (whose parameters exactly
 504                         // matches with the list) and possibly report CS1581.
 505                         string oper = null;
 506                         string returnTypeName = null;
 507                         if (memberName.StartsWith ("implicit operator ")) {
 508                                 oper = "op_Implicit";
 509                                 returnTypeName = memberName.Substring (18).Trim (wsChars);
 510                         }
 511                         else if (memberName.StartsWith ("explicit operator ")) {
 512                                 oper = "op_Explicit";
 513                                 returnTypeName = memberName.Substring (18).Trim (wsChars);
 514                         }
 515                         else if (memberName.StartsWith ("operator ")) {
 516                                 oper = memberName.Substring (9).Trim (wsChars);
 517                                 switch (oper) {
 518                                 // either unary or binary
 519                                 case "+":
 520                                         oper = paramList.Length == 2 ?
 521                                                 Binary.oper_names [(int) Binary.Operator.Addition] :
 522                                                 Unary.oper_names [(int) Unary.Operator.UnaryPlus];
 523                                         break;
 524                                 case "-":
 525                                         oper = paramList.Length == 2 ?
 526                                                 Binary.oper_names [(int) Binary.Operator.Subtraction] :
 527                                                 Unary.oper_names [(int) Unary.Operator.UnaryNegation];
 528                                         break;
 529                                 // unary
 530                                 case "!":
 531                                         oper = Unary.oper_names [(int) Unary.Operator.LogicalNot]; break;
 532                                 case "~":
 533                                         oper = Unary.oper_names [(int) Unary.Operator.OnesComplement]; break;
 534
 535                                 case "++":
 536                                         oper = "op_Increment"; break;
 537                                 case "--":
 538                                         oper = "op_Decrement"; break;
 539                                 case "true":
 540                                         oper = "op_True"; break;
 541                                 case "false":
 542                                         oper = "op_False"; break;
 543                                 // binary
 544                                 case "*":
 545                                         oper = Binary.oper_names [(int) Binary.Operator.Multiply]; break;
 546                                 case "/":
 547                                         oper = Binary.oper_names [(int) Binary.Operator.Division]; break;
 548                                 case "%":
 549                                         oper = Binary.oper_names [(int) Binary.Operator.Modulus]; break;
 550                                 case "&":
 551                                         oper = Binary.oper_names [(int) Binary.Operator.BitwiseAnd]; break;
 552                                 case "|":
 553                                         oper = Binary.oper_names [(int) Binary.Operator.BitwiseOr]; break;
 554                                 case "^":
 555                                         oper = Binary.oper_names [(int) Binary.Operator.ExclusiveOr]; break;
 556                                 case "<<":
 557                                         oper = Binary.oper_names [(int) Binary.Operator.LeftShift]; break;
 558                                 case ">>":
 559                                         oper = Binary.oper_names [(int) Binary.Operator.RightShift]; break;
 560                                 case "==":
 561                                         oper = Binary.oper_names [(int) Binary.Operator.Equality]; break;
 562                                 case "!=":
 563                                         oper = Binary.oper_names [(int) Binary.Operator.Inequality]; break;
 564                                 case "<":
 565                                         oper = Binary.oper_names [(int) Binary.Operator.LessThan]; break;
 566                                 case ">":
 567                                         oper = Binary.oper_names [(int) Binary.Operator.GreaterThan]; break;
 568                                 case "<=":
 569                                         oper = Binary.oper_names [(int) Binary.Operator.LessThanOrEqual]; break;
 570                                 case ">=":
 571                                         oper = Binary.oper_names [(int) Binary.Operator.GreaterThanOrEqual]; break;
 572                                 default:
 573                                         warningType = 1584;
 574                                         Report.Warning (1020, 1, mc.Location, "Overloadable {0} operator is expected", paramList.Length == 2 ? "binary" : "unary");
 575                                         Report.Warning (1584, 1, mc.Location, "XML comment on `{0}' has syntactically incorrect cref attribute `{1}'",
 576                                                 mc.GetSignatureForError (), cref);
 577                                         return null;
 578                                 }
 579                         }
 580                         // here we still don't consider return type (to
 581                         // detect CS1581 or CS1002+CS1584).
 582                         msig = new MethodSignature (oper, null, paramList);
 583
 584                         mis = FindMethodBase (type,
 585                                 BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Static | BindingFlags.Instance,
 586                                 msig);
 587                         if (mis.Length == 0)
 588                                 return null; // CS1574
 589                         MemberInfo mi = mis [0];
 590                         Type expected = mi is MethodInfo ?
 591                                 ((MethodInfo) mi).ReturnType :
 592                                 mi is PropertyInfo ?
 593                                 ((PropertyInfo) mi).PropertyType :
 594                                 null;
 595                         if (returnTypeName != null) {
 596                                 Type returnType = FindDocumentedType (mc, returnTypeName, ds, cref);
 597                                 if (returnType == null || returnType != expected) {
 598                                         warningType = 1581;
 599                                         Report.Warning (1581, 1, mc.Location, "Invalid return type in XML comment cref attribute `{0}'", cref);
 600                                         return null;
 601                                 }
 602                         }
 603                         return mis [0];
 604                 }
 605
 606                 private static bool IsAmbiguous (MemberInfo [] members)
 607                 {
 608                         if (members.Length < 2)
 609                                 return false;
 610                         if (members.Length > 2)
 611                                 return true;
 612                         if (members [0] is EventInfo && members [1] is FieldInfo)
 613                                 return false;
 614                         if (members [1] is EventInfo && members [0] is FieldInfo)
 615                                 return false;
 616                         return true;
 617                 }
 618
 619                 //
 620                 // Processes "see" or "seealso" elements.
 621                 // Checks cref attribute.
 622                 //
 623                 private static void HandleXrefCommon (MemberCore mc,
 624                         DeclSpace ds, XmlElement xref)
 625                 {
 626                         string cref = xref.GetAttribute ("cref").Trim (wsChars);
 627                         // when, XmlReader, "if (cref == null)"
 628                         if (!xref.HasAttribute ("cref"))
 629                                 return;
 630                         if (cref.Length == 0)
 631                                 Report.Warning (1001, 1, mc.Location, "Identifier expected");
 632                                 // ... and continue until CS1584.
 633
 634                         string signature; // "x:" are stripped
 635                         string name; // method invokation "(...)" are removed
 636                         string parameters; // method parameter list
 637
 638                         // strip 'T:' 'M:' 'F:' 'P:' 'E:' etc.
 639                         // Here, MS ignores its member kind. No idea why.
 640                         if (cref.Length > 2 && cref [1] == ':')
 641                                 signature = cref.Substring (2).Trim (wsChars);
 642                         else
 643                                 signature = cref;
 644
 645                         int parensPos = signature.IndexOf ('(');
 646                         int bracePos = parensPos >= 0 ? -1 :
 647                                 signature.IndexOf ('[');
 648                         if (parensPos > 0 && signature [signature.Length - 1] == ')') {
 649                                 name = signature.Substring (0, parensPos).Trim (wsChars);
 650                                 parameters = signature.Substring (parensPos + 1, signature.Length - parensPos - 2).Trim (wsChars);
 651                         }
 652                         else if (bracePos > 0 && signature [signature.Length - 1] == ']') {
 653                                 name = signature.Substring (0, bracePos).Trim (wsChars);
 654                                 parameters = signature.Substring (bracePos + 1, signature.Length - bracePos - 2).Trim (wsChars);
 655                         }
 656                         else {
 657                                 name = signature;
 658                                 parameters = null;
 659                         }
 660                         Normalize (mc, ref name);
 661
 662                         string identifier = GetBodyIdentifierFromName (name);
 663
 664                         // Check if identifier is valid.
 665                         // This check is not necessary to mark as error, but
 666                         // csc specially reports CS1584 for wrong identifiers.
 667                         string [] nameElems = identifier.Split ('.');
 668                         for (int i = 0; i < nameElems.Length; i++) {
 669                                 string nameElem = GetBodyIdentifierFromName (nameElems [i]);
 670                                 if (i > 0)
 671                                         Normalize (mc, ref nameElem);
 672                                 if (!Tokenizer.IsValidIdentifier (nameElem)
 673                                         && nameElem.IndexOf ("operator") < 0) {
 674                                         Report.Warning (1584, 1, mc.Location, "XML comment on `{0}' has syntactically incorrect cref attribute `{1}'",
 675                                                 mc.GetSignatureForError (), cref);
 676                                         xref.SetAttribute ("cref", "!:" + signature);
 677                                         return;
 678                                 }
 679                         }
 680
 681                         // check if parameters are valid
 682                         Type [] parameterTypes;
 683                         if (parameters == null)
 684                                 parameterTypes = null;
 685                         else if (parameters.Length == 0)
 686                                 parameterTypes = Type.EmptyTypes;
 687                         else {
 688                                 string [] paramList = parameters.Split (',');
 689                                 ArrayList plist = new ArrayList ();
 690                                 for (int i = 0; i < paramList.Length; i++) {
 691                                         string paramTypeName = paramList [i].Trim (wsChars);
 692                                         Normalize (mc, ref paramTypeName);
 693                                         Type paramType = FindDocumentedType (mc, paramTypeName, ds, cref);
 694                                         if (paramType == null) {
 695                                                 Report.Warning (1580, 1, mc.Location, "Invalid type for parameter `{0}' in XML comment cref attribute `{1}'",
 696                                                         (i + 1).ToString (), cref);
 697                                                 return;
 698                                         }
 699                                         plist.Add (paramType);
 700                                 }
 701                                 parameterTypes = plist.ToArray (typeof (Type)) as Type [];
 702                         }
 703
 704                         Type type = FindDocumentedType (mc, name, ds, cref);
 705                         if (type != null
 706                                 // delegate must not be referenced with args
 707                                 && (!type.IsSubclassOf (typeof (System.Delegate))
 708                                 || parameterTypes == null)) {
 709                                 string result = GetSignatureForDoc (type)
 710                                         + (bracePos < 0 ? String.Empty : signature.Substring (bracePos));
 711                                 xref.SetAttribute ("cref", "T:" + result);
 712                                 return; // a type
 713                         }
 714
 715                         int period = name.LastIndexOf ('.');
 716                         if (period > 0) {
 717                                 string typeName = name.Substring (0, period);
 718                                 string memberName = name.Substring (period + 1);
 719                                 Normalize (mc, ref memberName);
 720                                 type = FindDocumentedType (mc, typeName, ds, cref);
 721                                 int warnResult;
 722                                 if (type != null) {
 723                                         FoundMember fm = FindDocumentedMember (mc, type, memberName, parameterTypes, ds, out warnResult, cref, true, name);
 724                                         if (warnResult > 0)
 725                                                 return;
 726                                         if (!fm.IsEmpty) {
 727                                                 MemberInfo mi = fm.Member;
 728                                                 // we cannot use 'type' directly
 729                                                 // to get its name, since mi
 730                                                 // could be from DeclaringType
 731                                                 // for nested types.
 732                                                 xref.SetAttribute ("cref", GetMemberDocHead (mi.MemberType) + GetSignatureForDoc (fm.Type) + "." + memberName + GetParametersFormatted (mi));
 733                                                 return; // a member of a type
 734                                         }
 735                                 }
 736                         }
 737                         else {
 738                                 int warnResult;
 739                                 FoundMember fm = FindDocumentedMember (mc, ds.TypeBuilder, name, parameterTypes, ds, out warnResult, cref, true, name);
 740                                 if (warnResult > 0)
 741                                         return;
 742                                 if (!fm.IsEmpty) {
 743                                         MemberInfo mi = fm.Member;
 744                                         // we cannot use 'type' directly
 745                                         // to get its name, since mi
 746                                         // could be from DeclaringType
 747                                         // for nested types.
 748                                         xref.SetAttribute ("cref", GetMemberDocHead (mi.MemberType) + GetSignatureForDoc (fm.Type) + "." + name + GetParametersFormatted (mi));
 749                                         return; // local member name
 750                                 }
 751                         }
 752
 753                         // It still might be part of namespace name.
 754                         Namespace ns = ds.NamespaceEntry.NS.GetNamespace (name, false);
 755                         if (ns != null) {
 756                                 xref.SetAttribute ("cref", "N:" + ns.FullName);
 757                                 return; // a namespace
 758                         }
 759                         if (RootNamespace.Global.IsNamespace (name)) {
 760                                 xref.SetAttribute ("cref", "N:" + name);
 761                                 return; // a namespace
 762                         }
 763
 764                         Report.Warning (1574, 1, mc.Location, "XML comment on `{0}' has cref attribute `{1}' that could not be resolved",
 765                                 mc.GetSignatureForError (), cref);
 766
 767                         xref.SetAttribute ("cref", "!:" + name);
 768                 }
 769
 770                 static string GetParametersFormatted (MemberInfo mi)
 771                 {
 772                         MethodBase mb = mi as MethodBase;
 773                         bool isSetter = false;
 774                         PropertyInfo pi = mi as PropertyInfo;
 775                         if (pi != null) {
 776                                 mb = pi.GetGetMethod ();
 777                                 if (mb == null) {
 778                                         isSetter = true;
 779                                         mb = pi.GetSetMethod ();
 780                                 }
 781                         }
 782                         if (mb == null)
 783                                 return String.Empty;
 784
 785                         ParameterData parameters = TypeManager.GetParameterData (mb);
 786                         if (parameters == null || parameters.Count == 0)
 787                                 return String.Empty;
 788
 789                         StringBuilder sb = new StringBuilder ();
 790                         sb.Append ('(');
 791                         for (int i = 0; i < parameters.Count; i++) {
 792                                 if (isSetter && i + 1 == parameters.Count)
 793                                         break; // skip "value".
 794                                 if (i > 0)
 795                                         sb.Append (',');
 796                                 Type t = parameters.ParameterType (i);
 797                                 sb.Append (GetSignatureForDoc (t));
 798                         }
 799                         sb.Append (')');
 800                         return sb.ToString ();
 801                 }
 802
 803                 static string GetBodyIdentifierFromName (string name)
 804                 {
 805                         string identifier = name;
 806
 807                         if (name.Length > 0 && name [name.Length - 1] == ']') {
 808                                 string tmp = name.Substring (0, name.Length - 1).Trim (wsChars);
 809                                 int last = tmp.LastIndexOf ('[');
 810                                 if (last > 0)
 811                                         identifier = tmp.Substring (0, last).Trim (wsChars);
 812                         }
 813
 814                         return identifier;
 815                 }
 816
 817                 static void Report419 (MemberCore mc, string memberName, MemberInfo [] mis)
 818                 {
 819                         Report.Warning (419, 3, mc.Location,
 820                                 "Ambiguous reference in cref attribute `{0}'. Assuming `{1}' but other overloads including `{2}' have also matched",
 821                                 memberName,
 822                                 TypeManager.GetFullNameSignature (mis [0]),
 823                                 TypeManager.GetFullNameSignature (mis [1]));
 824                 }
 825
 826                 //
 827                 // Get a prefix from member type for XML documentation (used
 828                 // to formalize cref target name).
 829                 //
 830                 static string GetMemberDocHead (MemberTypes type)
 831                 {
 832                         switch (type) {
 833                         case MemberTypes.Constructor:
 834                         case MemberTypes.Method:
 835                                 return "M:";
 836                         case MemberTypes.Event:
 837                                 return "E:";
 838                         case MemberTypes.Field:
 839                                 return "F:";
 840                         case MemberTypes.NestedType:
 841                         case MemberTypes.TypeInfo:
 842                                 return "T:";
 843                         case MemberTypes.Property:
 844                                 return "P:";
 845                         }
 846                         return "!:";
 847                 }
 848
 849                 // MethodCore
 850
 851                 //
 852                 // Returns a string that represents the signature for this
 853                 // member which should be used in XML documentation.
 854                 //
 855                 public static string GetMethodDocCommentName (MethodCore mc, DeclSpace ds)
 856                 {
 857                         Parameter [] plist = mc.Parameters.FixedParameters;
 858                         string paramSpec = String.Empty;
 859                         if (plist != null) {
 860                                 StringBuilder psb = new StringBuilder ();
 861                                 foreach (Parameter p in plist) {
 862                                         psb.Append (psb.Length != 0 ? "," : "(");
 863                                         psb.Append (GetSignatureForDoc (p.ExternalType ()));
 864                                 }
 865                                 paramSpec = psb.ToString ();
 866                         }
 867
 868                         if (paramSpec.Length > 0)
 869                                 paramSpec += ")";
 870
 871                         string name = mc is Constructor ? "#ctor" : mc.Name;
 872                         string suffix = String.Empty;
 873                         Operator op = mc as Operator;
 874                         if (op != null) {
 875                                 switch (op.OperatorType) {
 876                                 case Operator.OpType.Implicit:
 877                                 case Operator.OpType.Explicit:
 878                                         suffix = "~" + GetSignatureForDoc (op.MethodBuilder.ReturnType);
 879                                         break;
 880                                 }
 881                         }
 882                         return String.Concat (mc.DocCommentHeader, ds.Name, ".", name, paramSpec, suffix);
 883                 }
 884
 885                 static string GetSignatureForDoc (Type type)
 886                 {
 887                         return TypeManager.IsGenericParameter (type) ?
 888                                 "`" + TypeManager.GenericParameterPosition (type) :
 889                                 type.FullName.Replace ("+", ".").Replace ('&', '@');
 890                 }
 891
 892                 //
 893                 // Raised (and passed an XmlElement that contains the comment)
 894                 // when GenerateDocComment is writing documentation expectedly.
 895                 //
 896                 // FIXME: with a few effort, it could be done with XmlReader,
 897                 // that means removal of DOM use.
 898                 //
 899                 internal static void OnMethodGenerateDocComment (
 900                         MethodCore mc, XmlElement el)
 901                 {
 902                         Hashtable paramTags = new Hashtable ();
 903                         foreach (XmlElement pelem in el.SelectNodes ("param")) {
 904                                 int i;
 905                                 string xname = pelem.GetAttribute ("name");
 906                                 if (xname.Length == 0)
 907                                         continue; // really? but MS looks doing so
 908                                 if (xname != "" && mc.Parameters.GetParameterByName (xname, out i) == null)
 909                                         Report.Warning (1572, 2, mc.Location, "XML comment on `{0}' has a param tag for `{1}', but there is no parameter by that name",
 910                                                 mc.GetSignatureForError (), xname);
 911                                 else if (paramTags [xname] != null)
 912                                         Report.Warning (1571, 2, mc.Location, "XML comment on `{0}' has a duplicate param tag for `{1}'",
 913                                                 mc.GetSignatureForError (), xname);
 914                                 paramTags [xname] = xname;
 915                         }
 916                         Parameter [] plist = mc.Parameters.FixedParameters;
 917                         foreach (Parameter p in plist) {
 918                                 if (paramTags.Count > 0 && paramTags [p.Name] == null)
 919                                         Report.Warning (1573, 4, mc.Location, "Parameter `{0}' has no matching param tag in the XML comment for `{1}'",
 920                                                 p.Name, mc.GetSignatureForError ());
 921                         }
 922                 }
 923
 924                 private static void Normalize (MemberCore mc, ref string name)
 925                 {
 926                         if (name.Length > 0 && name [0] == '@')
 927                                 name = name.Substring (1);
 928                         else if (name == "this")
 929                                 name = "Item";
 930                         else if (Tokenizer.IsKeyword (name) && !IsTypeName (name))
 931                                 Report.Warning (1041, 1, mc.Location, "Identifier expected. `{0}' is a keyword", name);
 932                 }
 933
 934                 private static bool IsTypeName (string name)
 935                 {
 936                         switch (name) {
 937                         case "bool":
 938                         case "byte":
 939                         case "char":
 940                         case "decimal":
 941                         case "double":
 942                         case "float":
 943                         case "int":
 944                         case "long":
 945                         case "object":
 946                         case "sbyte":
 947                         case "short":
 948                         case "string":
 949                         case "uint":
 950                         case "ulong":
 951                         case "ushort":
 952                         case "void":
 953                                 return true;
 954                         }
 955                         return false;
 956                 }
 957         }
 958
 959         //
 960         // Implements XML documentation generation.
 961         //
 962         public class Documentation
 963         {
 964                 public Documentation (string xml_output_filename)
 965                 {
 966                         docfilename = xml_output_filename;
 967                         XmlDocumentation = new XmlDocument ();
 968                         XmlDocumentation.PreserveWhitespace = false;
 969                 }
 970
 971                 private string docfilename;
 972
 973                 //
 974                 // Used to create element which helps well-formedness checking.
 975                 //
 976                 public XmlDocument XmlDocumentation;
 977
 978                 //
 979                 // The output for XML documentation.
 980                 //
 981                 public XmlWriter XmlCommentOutput;
 982
 983                 //
 984                 // Stores XmlDocuments that are included in XML documentation.
 985                 // Keys are included filenames, values are XmlDocuments.
 986                 //
 987                 public Hashtable StoredDocuments = new Hashtable ();
 988
 989                 //
 990                 // Outputs XML documentation comment from tokenized comments.
 991                 //
 992                 public bool OutputDocComment (string asmfilename)
 993                 {
 994                         XmlTextWriter w = null;
 995                         try {
 996                                 w = new XmlTextWriter (docfilename, null);
 997                                 w.Indentation = 4;
 998                                 w.Formatting = Formatting.Indented;
 999                                 w.WriteStartDocument ();
1000                                 w.WriteStartElement ("doc");
1001                                 w.WriteStartElement ("assembly");
1002                                 w.WriteStartElement ("name");
1003                                 w.WriteString (Path.ChangeExtension (asmfilename, null));
1004                                 w.WriteEndElement (); // name
1005                                 w.WriteEndElement (); // assembly
1006                                 w.WriteStartElement ("members");
1007                                 XmlCommentOutput = w;
1008                                 GenerateDocComment ();
1009                                 w.WriteFullEndElement (); // members
1010                                 w.WriteEndElement ();
1011                                 w.WriteWhitespace (Environment.NewLine);
1012                                 w.WriteEndDocument ();
1013                                 return true;
1014                         } catch (Exception ex) {
1015                                 Report.Error (1569, "Error generating XML documentation file `{0}' (`{1}')", docfilename, ex.Message);
1016                                 return false;
1017                         } finally {
1018                                 if (w != null)
1019                                         w.Close ();
1020                         }
1021                 }
1022
1023                 //
1024                 // Fixes full type name of each documented types/members up.
1025                 //
1026                 public void GenerateDocComment ()
1027                 {
1028                         TypeContainer root = RootContext.Tree.Types;
1029                         if (root.Interfaces != null)
1030                                 foreach (Interface i in root.Interfaces)
1031                                         DocUtil.GenerateTypeDocComment (i, null);
1032
1033                         if (root.Types != null)
1034                                 foreach (TypeContainer tc in root.Types)
1035                                         DocUtil.GenerateTypeDocComment (tc, null);
1036
1037                         if (root.Delegates != null)
1038                                 foreach (Delegate d in root.Delegates)
1039                                         DocUtil.GenerateDocComment (d, null);
1040
1041                         if (root.Enums != null)
1042                                 foreach (Enum e in root.Enums)
1043                                         e.GenerateDocComment (null);
1044
1045                 }
1046         }
1047 }
1048 #endif