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 (FieldBase 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 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                                 null, ds, out warn, cref, false, null).Member as Type;
 337                 }
 338
 339                 private static MemberInfo [] empty_member_infos =
 340                         new MemberInfo [0];
 341
 342                 private static MemberInfo [] FindMethodBase (Type type,
 343                         BindingFlags bindingFlags, MethodSignature signature)
 344                 {
 345                         MemberList ml = TypeManager.FindMembers (
 346                                 type,
 347                                 MemberTypes.Constructor | MemberTypes.Method | MemberTypes.Property | MemberTypes.Custom,
 348                                 bindingFlags,
 349                                 MethodSignature.method_signature_filter,
 350                                 signature);
 351                         if (ml == null)
 352                                 return empty_member_infos;
 353
 354                         return FilterOverridenMembersOut (type, (MemberInfo []) ml);
 355                 }
 356
 357                 static bool IsOverride (PropertyInfo deriv_prop, PropertyInfo base_prop)
 358                 {
 359                         if (!Invocation.IsAncestralType (base_prop.DeclaringType, deriv_prop.DeclaringType))
 360                                 return false;
 361
 362                         Type [] deriv_pd = TypeManager.GetArgumentTypes (deriv_prop);
 363                         Type [] base_pd = TypeManager.GetArgumentTypes (base_prop);
 364
 365                         if (deriv_pd.Length != base_pd.Length)
 366                                 return false;
 367
 368                         for (int j = 0; j < deriv_pd.Length; ++j) {
 369                                 if (deriv_pd [j] != base_pd [j])
 370                                         return false;
 371                                 Type ct = TypeManager.TypeToCoreType (deriv_pd [j]);
 372                                 Type bt = TypeManager.TypeToCoreType (base_pd [j]);
 373
 374                                 if (ct != bt)
 375                                         return false;
 376                         }
 377
 378                         return true;
 379                 }
 380
 381                 private static MemberInfo [] FilterOverridenMembersOut (
 382                         Type type, MemberInfo [] ml)
 383                 {
 384                         if (ml == null)
 385                                 return empty_member_infos;
 386
 387                         ArrayList al = new ArrayList (ml.Length);
 388                         for (int i = 0; i < ml.Length; i++) {
 389                                 MethodBase mx = ml [i] as MethodBase;
 390                                 PropertyInfo px = ml [i] as PropertyInfo;
 391                                 if (mx != null || px != null) {
 392                                         bool overriden = false;
 393                                         for (int j = 0; j < ml.Length; j++) {
 394                                                 if (j == i)
 395                                                         continue;
 396                                                 MethodBase my = ml [j] as MethodBase;
 397                                                 if (mx != null && my != null &&
 398                                                         Invocation.IsOverride (my, mx)) {
 399                                                         overriden = true;
 400                                                         break;
 401                                                 }
 402                                                 else if (mx != null)
 403                                                         continue;
 404                                                 PropertyInfo py = ml [j] as PropertyInfo;
 405                                                 if (px != null && py != null &&
 406                                                         IsOverride (py, px)) {
 407                                                         overriden = true;
 408                                                         break;
 409                                                 }
 410                                         }
 411                                         if (overriden)
 412                                                 continue;
 413                                 }
 414                                 al.Add (ml [i]);
 415                         }
 416                         return al.ToArray (typeof (MemberInfo)) as MemberInfo [];
 417                 }
 418
 419                 struct FoundMember
 420                 {
 421                         public static FoundMember Empty = new FoundMember (true);
 422
 423                         public bool IsEmpty;
 424                         public readonly MemberInfo Member;
 425                         public readonly Type Type;
 426
 427                         public FoundMember (bool regardlessOfThisValueItsEmpty)
 428                         {
 429                                 IsEmpty = true;
 430                                 Member = null;
 431                                 Type = null;
 432                         }
 433
 434                         public FoundMember (Type foundType, MemberInfo member)
 435                         {
 436                                 IsEmpty = false;
 437                                 Type = foundType;
 438                                 Member = member;
 439                         }
 440                 }
 441
 442                 //
 443                 // Returns a MemberInfo that is referenced in XML documentation
 444                 // (by "see" or "seealso" elements).
 445                 //
 446                 private static FoundMember FindDocumentedMember (MemberCore mc,
 447                         Type type, string memberName, Type [] paramList,
 448                         DeclSpace ds, out int warningType, string cref,
 449                         bool warn419, string nameForError)
 450                 {
 451                         for (; type != null; type = type.DeclaringType) {
 452                                 MemberInfo mi = FindDocumentedMemberNoNest (
 453                                         mc, type, memberName, paramList, ds,
 454                                         out warningType, cref, warn419,
 455                                         nameForError);
 456                                 if (mi != null)
 457                                         return new FoundMember (type, mi);
 458                         }
 459                         warningType = 0;
 460                         return FoundMember.Empty;
 461                 }
 462
 463                 private static MemberInfo FindDocumentedMemberNoNest (
 464                         MemberCore mc, Type type, string memberName,
 465                         Type [] paramList, DeclSpace ds, out int warningType,
 466                         string cref, bool warn419, string nameForError)
 467                 {
 468                         warningType = 0;
 469                         MemberInfo [] mis;
 470
 471                         if (paramList == null) {
 472                                 // search for fields/events etc.
 473                                 mis = TypeManager.MemberLookup (type, null,
 474                                         type, MemberTypes.All,
 475                                         BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Static | BindingFlags.Instance,
 476                                         memberName, null);
 477                                 mis = FilterOverridenMembersOut (type, mis);
 478                                 if (mis == null || mis.Length == 0)
 479                                         return null;
 480                                 if (warn419 && IsAmbiguous (mis))
 481                                         Report419 (mc, nameForError, mis);
 482                                 return mis [0];
 483                         }
 484
 485                         MethodSignature msig = new MethodSignature (memberName, null, paramList);
 486                         mis = FindMethodBase (type,
 487                                 BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Static | BindingFlags.Instance,
 488                                 msig);
 489
 490                         if (warn419 && mis.Length > 0) {
 491                                 if (IsAmbiguous (mis))
 492                                         Report419 (mc, nameForError, mis);
 493                                 return mis [0];
 494                         }
 495
 496                         // search for operators (whose parameters exactly
 497                         // matches with the list) and possibly report CS1581.
 498                         string oper = null;
 499                         string returnTypeName = null;
 500                         if (memberName.StartsWith ("implicit operator ")) {
 501                                 oper = "op_Implicit";
 502                                 returnTypeName = memberName.Substring (18).Trim (wsChars);
 503                         }
 504                         else if (memberName.StartsWith ("explicit operator ")) {
 505                                 oper = "op_Explicit";
 506                                 returnTypeName = memberName.Substring (18).Trim (wsChars);
 507                         }
 508                         else if (memberName.StartsWith ("operator ")) {
 509                                 oper = memberName.Substring (9).Trim (wsChars);
 510                                 switch (oper) {
 511                                 // either unary or binary
 512                                 case "+":
 513                                         oper = paramList.Length == 2 ?
 514                                                 Binary.oper_names [(int) Binary.Operator.Addition] :
 515                                                 Unary.oper_names [(int) Unary.Operator.UnaryPlus];
 516                                         break;
 517                                 case "-":
 518                                         oper = paramList.Length == 2 ?
 519                                                 Binary.oper_names [(int) Binary.Operator.Subtraction] :
 520                                                 Unary.oper_names [(int) Unary.Operator.UnaryNegation];
 521                                         break;
 522                                 // unary
 523                                 case "!":
 524                                         oper = Unary.oper_names [(int) Unary.Operator.LogicalNot]; break;
 525                                 case "~":
 526                                         oper = Unary.oper_names [(int) Unary.Operator.OnesComplement]; break;
 527
 528                                 case "++":
 529                                         oper = "op_Increment"; break;
 530                                 case "--":
 531                                         oper = "op_Decrement"; break;
 532                                 case "true":
 533                                         oper = "op_True"; break;
 534                                 case "false":
 535                                         oper = "op_False"; break;
 536                                 // binary
 537                                 case "*":
 538                                         oper = Binary.oper_names [(int) Binary.Operator.Multiply]; break;
 539                                 case "/":
 540                                         oper = Binary.oper_names [(int) Binary.Operator.Division]; break;
 541                                 case "%":
 542                                         oper = Binary.oper_names [(int) Binary.Operator.Modulus]; break;
 543                                 case "&":
 544                                         oper = Binary.oper_names [(int) Binary.Operator.BitwiseAnd]; break;
 545                                 case "|":
 546                                         oper = Binary.oper_names [(int) Binary.Operator.BitwiseOr]; break;
 547                                 case "^":
 548                                         oper = Binary.oper_names [(int) Binary.Operator.ExclusiveOr]; break;
 549                                 case "<<":
 550                                         oper = Binary.oper_names [(int) Binary.Operator.LeftShift]; break;
 551                                 case ">>":
 552                                         oper = Binary.oper_names [(int) Binary.Operator.RightShift]; break;
 553                                 case "==":
 554                                         oper = Binary.oper_names [(int) Binary.Operator.Equality]; break;
 555                                 case "!=":
 556                                         oper = Binary.oper_names [(int) Binary.Operator.Inequality]; break;
 557                                 case "<":
 558                                         oper = Binary.oper_names [(int) Binary.Operator.LessThan]; break;
 559                                 case ">":
 560                                         oper = Binary.oper_names [(int) Binary.Operator.GreaterThan]; break;
 561                                 case "<=":
 562                                         oper = Binary.oper_names [(int) Binary.Operator.LessThanOrEqual]; break;
 563                                 case ">=":
 564                                         oper = Binary.oper_names [(int) Binary.Operator.GreaterThanOrEqual]; break;
 565                                 default:
 566                                         warningType = 1584;
 567                                         Report.Warning (1020, 1, mc.Location, "Overloadable {0} operator is expected", paramList.Length == 2 ? "binary" : "unary");
 568                                         Report.Warning (1584, 1, mc.Location, "XML comment on `{0}' has syntactically incorrect cref attribute `{1}'",
 569                                                 mc.GetSignatureForError (), cref);
 570                                         return null;
 571                                 }
 572                         }
 573                         // here we still don't consider return type (to
 574                         // detect CS1581 or CS1002+CS1584).
 575                         msig = new MethodSignature (oper, null, paramList);
 576
 577                         mis = FindMethodBase (type,
 578                                 BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Static | BindingFlags.Instance,
 579                                 msig);
 580                         if (mis.Length == 0)
 581                                 return null; // CS1574
 582                         MemberInfo mi = mis [0];
 583                         Type expected = mi is MethodInfo ?
 584                                 ((MethodInfo) mi).ReturnType :
 585                                 mi is PropertyInfo ?
 586                                 ((PropertyInfo) mi).PropertyType :
 587                                 null;
 588                         if (returnTypeName != null) {
 589                                 Type returnType = FindDocumentedType (mc, returnTypeName, ds, cref);
 590                                 if (returnType == null || returnType != expected) {
 591                                         warningType = 1581;
 592                                         Report.Warning (1581, 1, mc.Location, "Invalid return type in XML comment cref attribute `{0}'", cref);
 593                                         return null;
 594                                 }
 595                         }
 596                         return mis [0];
 597                 }
 598
 599                 private static bool IsAmbiguous (MemberInfo [] members)
 600                 {
 601                         if (members.Length < 2)
 602                                 return false;
 603                         if (members.Length > 2)
 604                                 return true;
 605                         if (members [0] is EventInfo && members [1] is FieldInfo)
 606                                 return false;
 607                         if (members [1] is EventInfo && members [0] is FieldInfo)
 608                                 return false;
 609                         return true;
 610                 }
 611
 612                 //
 613                 // Processes "see" or "seealso" elements.
 614                 // Checks cref attribute.
 615                 //
 616                 private static void HandleXrefCommon (MemberCore mc,
 617                         DeclSpace ds, XmlElement xref)
 618                 {
 619                         string cref = xref.GetAttribute ("cref").Trim (wsChars);
 620                         // when, XmlReader, "if (cref == null)"
 621                         if (!xref.HasAttribute ("cref"))
 622                                 return;
 623                         if (cref.Length == 0)
 624                                 Report.Warning (1001, 1, mc.Location, "Identifier expected");
 625                                 // ... and continue until CS1584.
 626
 627                         string signature; // "x:" are stripped
 628                         string name; // method invokation "(...)" are removed
 629                         string parameters; // method parameter list
 630
 631                         // strip 'T:' 'M:' 'F:' 'P:' 'E:' etc.
 632                         // Here, MS ignores its member kind. No idea why.
 633                         if (cref.Length > 2 && cref [1] == ':')
 634                                 signature = cref.Substring (2).Trim (wsChars);
 635                         else
 636                                 signature = cref;
 637
 638                         int parensPos = signature.IndexOf ('(');
 639                         int bracePos = parensPos >= 0 ? -1 :
 640                                 signature.IndexOf ('[');
 641                         if (parensPos > 0 && signature [signature.Length - 1] == ')') {
 642                                 name = signature.Substring (0, parensPos).Trim (wsChars);
 643                                 parameters = signature.Substring (parensPos + 1, signature.Length - parensPos - 2).Trim (wsChars);
 644                         }
 645                         else if (bracePos > 0 && signature [signature.Length - 1] == ']') {
 646                                 name = signature.Substring (0, bracePos).Trim (wsChars);
 647                                 parameters = signature.Substring (bracePos + 1, signature.Length - bracePos - 2).Trim (wsChars);
 648                         }
 649                         else {
 650                                 name = signature;
 651                                 parameters = null;
 652                         }
 653                         Normalize (mc, ref name);
 654
 655                         string identifier = GetBodyIdentifierFromName (name);
 656
 657                         // Check if identifier is valid.
 658                         // This check is not necessary to mark as error, but
 659                         // csc specially reports CS1584 for wrong identifiers.
 660                         string [] nameElems = identifier.Split ('.');
 661                         for (int i = 0; i < nameElems.Length; i++) {
 662                                 string nameElem = GetBodyIdentifierFromName (nameElems [i]);
 663                                 if (i > 0)
 664                                         Normalize (mc, ref nameElem);
 665                                 if (!Tokenizer.IsValidIdentifier (nameElem)
 666                                         && nameElem.IndexOf ("operator") < 0) {
 667                                         Report.Warning (1584, 1, mc.Location, "XML comment on `{0}' has syntactically incorrect cref attribute `{1}'",
 668                                                 mc.GetSignatureForError (), cref);
 669                                         xref.SetAttribute ("cref", "!:" + signature);
 670                                         return;
 671                                 }
 672                         }
 673
 674                         // check if parameters are valid
 675                         Type [] parameterTypes;
 676                         if (parameters == null)
 677                                 parameterTypes = null;
 678                         else if (parameters.Length == 0)
 679                                 parameterTypes = Type.EmptyTypes;
 680                         else {
 681                                 string [] paramList = parameters.Split (',');
 682                                 ArrayList plist = new ArrayList ();
 683                                 for (int i = 0; i < paramList.Length; i++) {
 684                                         string paramTypeName = paramList [i].Trim (wsChars);
 685                                         Normalize (mc, ref paramTypeName);
 686                                         Type paramType = FindDocumentedType (mc, paramTypeName, ds, cref);
 687                                         if (paramType == null) {
 688                                                 Report.Warning (1580, 1, mc.Location, "Invalid type for parameter `{0}' in XML comment cref attribute `{1}'",
 689                                                         (i + 1).ToString (), cref);
 690                                                 return;
 691                                         }
 692                                         plist.Add (paramType);
 693                                 }
 694                                 parameterTypes = plist.ToArray (typeof (Type)) as Type [];
 695                         }
 696
 697                         Type type = FindDocumentedType (mc, name, ds, cref);
 698                         if (type != null
 699                                 // delegate must not be referenced with args
 700                                 && (!type.IsSubclassOf (typeof (System.Delegate))
 701                                 || parameterTypes == null)) {
 702                                 string result = type.FullName.Replace ("+", ".")
 703                                         + (bracePos < 0 ? String.Empty : signature.Substring (bracePos));
 704                                 xref.SetAttribute ("cref", "T:" + result);
 705                                 return; // a type
 706                         }
 707
 708                         // don't use identifier here. System[] is not alloed.
 709                         if (RootNamespace.Global.IsNamespace (name)) {
 710                                 xref.SetAttribute ("cref", "N:" + name);
 711                                 return; // a namespace
 712                         }
 713
 714                         int period = name.LastIndexOf ('.');
 715                         if (period > 0) {
 716                                 string typeName = name.Substring (0, period);
 717                                 string memberName = name.Substring (period + 1);
 718                                 Normalize (mc, ref memberName);
 719                                 type = FindDocumentedType (mc, typeName, ds, cref);
 720                                 int warnResult;
 721                                 if (type != null) {
 722                                         FoundMember fm = FindDocumentedMember (mc, type, memberName, parameterTypes, ds, out warnResult, cref, true, name);
 723                                         if (warnResult > 0)
 724                                                 return;
 725                                         if (!fm.IsEmpty) {
 726                                                 MemberInfo mi = fm.Member;
 727                                                 // we cannot use 'type' directly
 728                                                 // to get its name, since mi
 729                                                 // could be from DeclaringType
 730                                                 // for nested types.
 731                                                 xref.SetAttribute ("cref", GetMemberDocHead (mi.MemberType) + fm.Type.FullName.Replace ("+", ".") + "." + memberName + GetParametersFormatted (mi));
 732                                                 return; // a member of a type
 733                                         }
 734                                 }
 735                         }
 736                         else {
 737                                 int warnResult;
 738                                 FoundMember fm = FindDocumentedMember (mc, ds.TypeBuilder, name, parameterTypes, ds, out warnResult, cref, true, name);
 739                                 if (warnResult > 0)
 740                                         return;
 741                                 if (!fm.IsEmpty) {
 742                                         MemberInfo mi = fm.Member;
 743                                         // we cannot use 'type' directly
 744                                         // to get its name, since mi
 745                                         // could be from DeclaringType
 746                                         // for nested types.
 747                                         xref.SetAttribute ("cref", GetMemberDocHead (mi.MemberType) + fm.Type.FullName.Replace ("+", ".") + "." + name + GetParametersFormatted (mi));
 748                                         return; // local member name
 749                                 }
 750                         }
 751
 752                         Report.Warning (1574, 1, mc.Location, "XML comment on `{0}' has cref attribute `{1}' that could not be resolved",
 753                                 mc.GetSignatureForError (), cref);
 754
 755                         xref.SetAttribute ("cref", "!:" + name);
 756                 }
 757
 758                 static string GetParametersFormatted (MemberInfo mi)
 759                 {
 760                         MethodBase mb = mi as MethodBase;
 761                         bool isSetter = false;
 762                         PropertyInfo pi = mi as PropertyInfo;
 763                         if (pi != null) {
 764                                 mb = pi.GetGetMethod ();
 765                                 if (mb == null) {
 766                                         isSetter = true;
 767                                         mb = pi.GetSetMethod ();
 768                                 }
 769                         }
 770                         if (mb == null)
 771                                 return String.Empty;
 772
 773                         ParameterData parameters = TypeManager.GetParameterData (mb);
 774                         if (parameters == null || parameters.Count == 0)
 775                                 return String.Empty;
 776
 777                         StringBuilder sb = new StringBuilder ();
 778                         sb.Append ('(');
 779                         for (int i = 0; i < parameters.Count; i++) {
 780                                 if (isSetter && i + 1 == parameters.Count)
 781                                         break; // skip "value".
 782                                 if (i > 0)
 783                                         sb.Append (',');
 784                                 Type t = parameters.ParameterType (i);
 785                                 sb.Append (t.FullName.Replace ('+', '.').Replace ('&', '@'));
 786                         }
 787                         sb.Append (')');
 788                         return sb.ToString ();
 789                 }
 790
 791                 static string GetBodyIdentifierFromName (string name)
 792                 {
 793                         string identifier = name;
 794
 795                         if (name.Length > 0 && name [name.Length - 1] == ']') {
 796                                 string tmp = name.Substring (0, name.Length - 1).Trim (wsChars);
 797                                 int last = tmp.LastIndexOf ('[');
 798                                 if (last > 0)
 799                                         identifier = tmp.Substring (0, last).Trim (wsChars);
 800                         }
 801
 802                         return identifier;
 803                 }
 804
 805                 static void Report419 (MemberCore mc, string memberName, MemberInfo [] mis)
 806                 {
 807                         Report.Warning (419, 3, mc.Location,
 808                                 "Ambiguous reference in cref attribute `{0}'. Assuming `{1}' but other overloads including `{2}' have also matched",
 809                                 memberName,
 810                                 TypeManager.GetFullNameSignature (mis [0]),
 811                                 TypeManager.GetFullNameSignature (mis [1]));
 812                 }
 813
 814                 //
 815                 // Get a prefix from member type for XML documentation (used
 816                 // to formalize cref target name).
 817                 //
 818                 static string GetMemberDocHead (MemberTypes type)
 819                 {
 820                         switch (type) {
 821                         case MemberTypes.Constructor:
 822                         case MemberTypes.Method:
 823                                 return "M:";
 824                         case MemberTypes.Event:
 825                                 return "E:";
 826                         case MemberTypes.Field:
 827                                 return "F:";
 828                         case MemberTypes.NestedType:
 829                         case MemberTypes.TypeInfo:
 830                                 return "T:";
 831                         case MemberTypes.Property:
 832                                 return "P:";
 833                         }
 834                         return "!:";
 835                 }
 836
 837                 // MethodCore
 838
 839                 //
 840                 // Returns a string that represents the signature for this
 841                 // member which should be used in XML documentation.
 842                 //
 843                 public static string GetMethodDocCommentName (MethodCore mc, DeclSpace ds)
 844                 {
 845                         Parameter [] plist = mc.Parameters.FixedParameters;
 846                         string paramSpec = String.Empty;
 847                         if (plist != null) {
 848                                 StringBuilder psb = new StringBuilder ();
 849                                 foreach (Parameter p in plist) {
 850                                         psb.Append (psb.Length != 0 ? "," : "(");
 851                                         psb.Append (p.ExternalType ().FullName.Replace ("+", ".").Replace ('&', '@'));
 852                                 }
 853                                 paramSpec = psb.ToString ();
 854                         }
 855
 856                         if (paramSpec.Length > 0)
 857                                 paramSpec += ")";
 858
 859                         string name = mc is Constructor ? "#ctor" : mc.Name;
 860                         string suffix = String.Empty;
 861                         Operator op = mc as Operator;
 862                         if (op != null) {
 863                                 switch (op.OperatorType) {
 864                                 case Operator.OpType.Implicit:
 865                                 case Operator.OpType.Explicit:
 866                                         suffix = "~" + op.OperatorMethodBuilder.ReturnType.FullName.Replace ('+', '.');
 867                                         break;
 868                                 }
 869                         }
 870                         return String.Concat (mc.DocCommentHeader, ds.Name, ".", name, paramSpec, suffix);
 871                 }
 872
 873                 //
 874                 // Raised (and passed an XmlElement that contains the comment)
 875                 // when GenerateDocComment is writing documentation expectedly.
 876                 //
 877                 // FIXME: with a few effort, it could be done with XmlReader,
 878                 // that means removal of DOM use.
 879                 //
 880                 internal static void OnMethodGenerateDocComment (
 881                         MethodCore mc, DeclSpace ds, XmlElement el)
 882                 {
 883                         Hashtable paramTags = new Hashtable ();
 884                         foreach (XmlElement pelem in el.SelectNodes ("param")) {
 885                                 int i;
 886                                 string xname = pelem.GetAttribute ("name");
 887                                 if (xname == "")
 888                                         continue; // really? but MS looks doing so
 889                                 if (xname != "" && mc.Parameters.GetParameterByName (xname, out i) == null)
 890                                         Report.Warning (1572, 2, mc.Location, "XML comment on `{0}' has a param tag for `{1}', but there is no parameter by that name",
 891                                                 mc.GetSignatureForError (), xname);
 892                                 else if (paramTags [xname] != null)
 893                                         Report.Warning (1571, 2, mc.Location, "XML comment on `{0}' has a duplicate param tag for `{1}'",
 894                                                 mc.GetSignatureForError (), xname);
 895                                 paramTags [xname] = xname;
 896                         }
 897                         Parameter [] plist = mc.Parameters.FixedParameters;
 898                         foreach (Parameter p in plist) {
 899                                 if (paramTags.Count > 0 && paramTags [p.Name] == null)
 900                                         Report.Warning (1573, 4, mc.Location, "Parameter `{0}' has no matching param tag in the XML comment for `{1}'",
 901                                                 p.Name, mc.GetSignatureForError ());
 902                         }
 903                 }
 904
 905                 private static void Normalize (MemberCore mc, ref string name)
 906                 {
 907                         if (name.Length > 0 && name [0] == '@')
 908                                 name = name.Substring (1);
 909                         else if (name == "this")
 910                                 name = "Item";
 911                         else if (Tokenizer.IsKeyword (name) && !IsTypeName (name))
 912                                 Report.Warning (1041, 1, mc.Location, "Identifier expected. `{0}' is a keyword", name);
 913                 }
 914
 915                 private static bool IsTypeName (string name)
 916                 {
 917                         switch (name) {
 918                         case "bool":
 919                         case "byte":
 920                         case "char":
 921                         case "decimal":
 922                         case "double":
 923                         case "float":
 924                         case "int":
 925                         case "long":
 926                         case "object":
 927                         case "sbyte":
 928                         case "short":
 929                         case "string":
 930                         case "uint":
 931                         case "ulong":
 932                         case "ushort":
 933                         case "void":
 934                                 return true;
 935                         }
 936                         return false;
 937                 }
 938         }
 939
 940         //
 941         // Implements XML documentation generation.
 942         //
 943         public class Documentation
 944         {
 945                 public Documentation (string xml_output_filename)
 946                 {
 947                         docfilename = xml_output_filename;
 948                         XmlDocumentation = new XmlDocument ();
 949                         XmlDocumentation.PreserveWhitespace = false;
 950                 }
 951
 952                 private string docfilename;
 953
 954                 //
 955                 // Used to create element which helps well-formedness checking.
 956                 //
 957                 public XmlDocument XmlDocumentation;
 958
 959                 //
 960                 // The output for XML documentation.
 961                 //
 962                 public XmlWriter XmlCommentOutput;
 963
 964                 //
 965                 // Stores XmlDocuments that are included in XML documentation.
 966                 // Keys are included filenames, values are XmlDocuments.
 967                 //
 968                 public Hashtable StoredDocuments = new Hashtable ();
 969
 970                 //
 971                 // Stores comments on partial types (should handle uniquely).
 972                 // Keys are PartialContainers, values are comment strings
 973                 // (didn't use StringBuilder; usually we have just 2 or more).
 974                 //
 975                 public IDictionary PartialComments = new ListDictionary ();
 976
 977                 //
 978                 // Outputs XML documentation comment from tokenized comments.
 979                 //
 980                 public bool OutputDocComment (string asmfilename)
 981                 {
 982                         XmlTextWriter w = null;
 983                         try {
 984                                 w = new XmlTextWriter (docfilename, null);
 985                                 w.Indentation = 4;
 986                                 w.Formatting = Formatting.Indented;
 987                                 w.WriteStartDocument ();
 988                                 w.WriteStartElement ("doc");
 989                                 w.WriteStartElement ("assembly");
 990                                 w.WriteStartElement ("name");
 991                                 w.WriteString (Path.ChangeExtension (asmfilename, null));
 992                                 w.WriteEndElement (); // name
 993                                 w.WriteEndElement (); // assembly
 994                                 w.WriteStartElement ("members");
 995                                 XmlCommentOutput = w;
 996                                 GenerateDocComment ();
 997                                 w.WriteFullEndElement (); // members
 998                                 w.WriteEndElement ();
 999                                 w.WriteWhitespace (Environment.NewLine);
1000                                 w.WriteEndDocument ();
1001                                 return true;
1002                         } catch (Exception ex) {
1003                                 Report.Error (1569, "Error generating XML documentation file `{0}' (`{1}')", docfilename, ex.Message);
1004                                 return false;
1005                         } finally {
1006                                 if (w != null)
1007                                         w.Close ();
1008                         }
1009                 }
1010
1011                 //
1012                 // Fixes full type name of each documented types/members up.
1013                 //
1014                 public void GenerateDocComment ()
1015                 {
1016                         TypeContainer root = RootContext.Tree.Types;
1017                         if (root.Interfaces != null)
1018                                 foreach (Interface i in root.Interfaces)
1019                                         DocUtil.GenerateTypeDocComment (i, null);
1020
1021                         if (root.Types != null)
1022                                 foreach (TypeContainer tc in root.Types)
1023                                         DocUtil.GenerateTypeDocComment (tc, null);
1024
1025                         if (root.Parts != null) {
1026                                 IDictionary comments = PartialComments;
1027                                 foreach (ClassPart cp in root.Parts) {
1028                                         if (cp.DocComment == null)
1029                                                 continue;
1030                                         comments [cp] = cp;
1031                                 }
1032                         }
1033
1034                         if (root.Delegates != null)
1035                                 foreach (Delegate d in root.Delegates)
1036                                         DocUtil.GenerateDocComment (d, null);
1037
1038                         if (root.Enums != null)
1039                                 foreach (Enum e in root.Enums)
1040                                         e.GenerateDocComment (null);
1041
1042                         IDictionary table = new ListDictionary ();
1043                         foreach (ClassPart cp in PartialComments.Keys) {
1044                                 // FIXME: IDictionary does not guarantee that the keys will be
1045                                 //        accessed in the order they were added.
1046                                 table [cp.PartialContainer] += cp.DocComment;
1047                         }
1048                         foreach (PartialContainer pc in table.Keys) {
1049                                 pc.DocComment = table [pc] as string;
1050                                 DocUtil.GenerateDocComment (pc, null);
1051                         }
1052                 }
1053         }
1054 }
1055
1056 #endif