mcs/class/Microsoft.Build/Microsoft.Build.Evaluation/ProjectCollection.cs

   1 //
   2 // ProjectCollection.cs
   3 //
   4 // Author:
   5 //   Leszek Ciesielski (skolima@gmail.com)
   6 //   Rolf Bjarne Kvinge (rolf@xamarin.com)
   7 //   Atsushi Enomoto (atsushi@xamarin.com)
   8 //
   9 // (C) 2011 Leszek Ciesielski
  10 // Copyright (C) 2011,2013 Xamarin Inc.
  11 //
  12 // Permission is hereby granted, free of charge, to any person obtaining
  13 // a copy of this software and associated documentation files (the
  14 // "Software"), to deal in the Software without restriction, including
  15 // without limitation the rights to use, copy, modify, merge, publish,
  16 // distribute, sublicense, and/or sell copies of the Software, and to
  17 // permit persons to whom the Software is furnished to do so, subject to
  18 // the following conditions:
  19 //
  20 // The above copyright notice and this permission notice shall be
  21 // included in all copies or substantial portions of the Software.
  22 //
  23 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  24 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  25 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  26 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  27 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  28 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  29 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  30 //
  31
  32 using Microsoft.Build.Construction;
  33 using Microsoft.Build.Execution;
  34 using Microsoft.Build.Framework;
  35 using Microsoft.Build.Logging;
  36 using Microsoft.Build.Utilities;
  37 using System;
  38 using System.Collections.Generic;
  39 using System.Collections.ObjectModel;
  40 using System.IO;
  41 using System.Linq;
  42 using System.Xml;
  43 using System.Reflection;
  44 using System.Globalization;
  45 using Mono.XBuild.Utilities;
  46 using Microsoft.Build.Internal;
  47
  48 namespace Microsoft.Build.Evaluation
  49 {
  50         public class ProjectCollection : IDisposable
  51         {
  52                 public delegate void ProjectAddedEventHandler (object sender, ProjectAddedToProjectCollectionEventArgs e);
  53
  54                 public class ProjectAddedToProjectCollectionEventArgs : EventArgs
  55                 {
  56                         public ProjectAddedToProjectCollectionEventArgs (ProjectRootElement element)
  57                         {
  58                                 if (element == null)
  59                                         throw new ArgumentNullException ("project");
  60                                 ProjectRootElement = element;
  61                         }
  62
  63                         public ProjectRootElement ProjectRootElement { get; private set; }
  64                 }
  65
  66                 // static members
  67
  68                 static readonly ProjectCollection global_project_collection;
  69
  70                 static ProjectCollection ()
  71                 {
  72                         global_project_collection = new ProjectCollection (new ReadOnlyDictionary<string, string> (new Dictionary<string, string> ()));
  73                 }
  74
  75                 public static string Escape (string unescapedString)
  76                 {
  77                         return Mono.XBuild.Utilities.MSBuildUtils.Escape (unescapedString);
  78                 }
  79
  80                 public static string Unescape (string escapedString)
  81                 {
  82                         return Mono.XBuild.Utilities.MSBuildUtils.Unescape (escapedString);
  83                 }
  84
  85                 public static ProjectCollection GlobalProjectCollection {
  86                         get { return global_project_collection; }
  87                 }
  88
  89                 // semantic model part
  90
  91                 public ProjectCollection ()
  92                         : this (null)
  93                 {
  94                 }
  95
  96                 public ProjectCollection (IDictionary<string, string> globalProperties)
  97                 : this (globalProperties, null, ToolsetDefinitionLocations.Registry | ToolsetDefinitionLocations.ConfigurationFile)
  98                 {
  99                 }
 100
 101                 public ProjectCollection (ToolsetDefinitionLocations toolsetLocations)
 102                 : this (null, null, toolsetLocations)
 103                 {
 104                 }
 105
 106                 public ProjectCollection (IDictionary<string, string> globalProperties, IEnumerable<ILogger> loggers,
 107                                 ToolsetDefinitionLocations toolsetDefinitionLocations)
 108                         : this (globalProperties, loggers, null, toolsetDefinitionLocations, 1, false)
 109                 {
 110                 }
 111
 112                 public ProjectCollection (IDictionary<string, string> globalProperties,
 113                                 IEnumerable<ILogger> loggers, IEnumerable<ForwardingLoggerRecord> remoteLoggers,
 114                                 ToolsetDefinitionLocations toolsetDefinitionLocations,
 115                                 int maxNodeCount, bool onlyLogCriticalEvents)
 116                 {
 117                         global_properties = globalProperties ?? new Dictionary<string, string> ();
 118                         this.loggers = loggers != null ? loggers.ToList () : new List<ILogger> ();
 119                         toolset_locations = toolsetDefinitionLocations;
 120                         MaxNodeCount = maxNodeCount;
 121                         OnlyLogCriticalEvents = onlyLogCriticalEvents;
 122
 123                         LoadDefaultToolsets ();
 124                 }
 125
 126                 [MonoTODO ("not fired yet")]
 127                 public event ProjectAddedEventHandler ProjectAdded;
 128                 [MonoTODO ("not fired yet")]
 129                 public event EventHandler<ProjectChangedEventArgs> ProjectChanged;
 130                 [MonoTODO ("not fired yet")]
 131                 public event EventHandler<ProjectCollectionChangedEventArgs> ProjectCollectionChanged;
 132                 [MonoTODO ("not fired yet")]
 133                 public event EventHandler<ProjectXmlChangedEventArgs> ProjectXmlChanged;
 134
 135                 public void AddProject (Project project)
 136                 {
 137                         this.loaded_projects.Add (project);
 138                         if (ProjectAdded != null)
 139                                 ProjectAdded (this, new ProjectAddedToProjectCollectionEventArgs (project.Xml));
 140                 }
 141
 142                 public int Count {
 143                         get { return loaded_projects.Count; }
 144                 }
 145
 146                 string default_tools_version;
 147                 public string DefaultToolsVersion {
 148                         get { return default_tools_version; }
 149                         set {
 150                                 if (GetToolset (value) == null)
 151                                         throw new InvalidOperationException (string.Format ("Toolset '{0}' does not exist", value));
 152                                 default_tools_version = value;
 153                         }
 154                 }
 155
 156                 public void Dispose ()
 157                 {
 158                         Dispose (true);
 159                         GC.SuppressFinalize (this);
 160                 }
 161
 162                 protected virtual void Dispose (bool disposing)
 163                 {
 164                         if (disposing) {
 165                         }
 166                 }
 167
 168                 public ICollection<Project> GetLoadedProjects (string fullPath)
 169                 {
 170                         return LoadedProjects.Where (p => p.FullPath != null && Path.GetFullPath (p.FullPath) == Path.GetFullPath (fullPath)).ToList ();
 171                 }
 172
 173                 readonly IDictionary<string, string> global_properties;
 174
 175                 public IDictionary<string, string> GlobalProperties {
 176                         get { return global_properties; }
 177                 }
 178
 179                 readonly List<Project> loaded_projects = new List<Project> ();
 180
 181                 public Project LoadProject (string fileName)
 182                 {
 183                         return LoadProject (fileName, DefaultToolsVersion);
 184                 }
 185
 186                 public Project LoadProject (string fileName, string toolsVersion)
 187                 {
 188                         return LoadProject (fileName, null, toolsVersion);
 189                 }
 190
 191                 public Project LoadProject (string fileName, IDictionary<string,string> globalProperties, string toolsVersion)
 192                 {
 193                         var ret = new Project (fileName, globalProperties, toolsVersion);
 194                         loaded_projects.Add (ret);
 195                         return ret;
 196                 }
 197
 198                 // These methods somehow don't add the project to ProjectCollection...
 199                 public Project LoadProject (XmlReader xmlReader)
 200                 {
 201                         return LoadProject (xmlReader, DefaultToolsVersion);
 202                 }
 203
 204                 public Project LoadProject (XmlReader xmlReader, string toolsVersion)
 205                 {
 206                         return LoadProject (xmlReader, null, toolsVersion);
 207                 }
 208
 209                 public Project LoadProject (XmlReader xmlReader, IDictionary<string,string> globalProperties, string toolsVersion)
 210                 {
 211                         return new Project (xmlReader, globalProperties, toolsVersion);
 212                 }
 213
 214                 public ICollection<Project> LoadedProjects {
 215                         get { return loaded_projects; }
 216                 }
 217
 218                 readonly List<ILogger> loggers = new List<ILogger> ();
 219
 220                 public ICollection<ILogger> Loggers {
 221                         get { return loggers; }
 222                 }
 223
 224                 [MonoTODO]
 225                 public bool OnlyLogCriticalEvents { get; set; }
 226
 227                 [MonoTODO]
 228                 public bool SkipEvaluation { get; set; }
 229
 230                 readonly ToolsetDefinitionLocations toolset_locations;
 231                 public ToolsetDefinitionLocations ToolsetLocations {
 232                         get { return toolset_locations; }
 233                 }
 234
 235                 readonly List<Toolset> toolsets = new List<Toolset> ();
 236                 // so what should we do without ToolLocationHelper in Microsoft.Build.Utilities.dll? There is no reference to it in this dll.
 237                 public ICollection<Toolset> Toolsets {
 238                         // For ConfigurationFile and None, they cannot be added externally.
 239                         get { return (ToolsetLocations & ToolsetDefinitionLocations.Registry) != 0 ? toolsets : toolsets.ToList (); }
 240                 }
 241
 242                 public Toolset GetToolset (string toolsVersion)
 243                 {
 244                         return Toolsets.FirstOrDefault (t => t.ToolsVersion == toolsVersion);
 245                 }
 246
 247                 //FIXME: should also support config file, depending on ToolsetLocations
 248                 void LoadDefaultToolsets ()
 249                 {
 250                         AddToolset (new Toolset ("4.0",
 251                                 ToolLocationHelper.GetPathToDotNetFramework (TargetDotNetFrameworkVersion.Version40), this, null));
 252 #if XBUILD_12
 253                         AddToolset (new Toolset ("12.0", ToolLocationHelper.GetPathToBuildTools ("12.0"), this, null));
 254 #endif
 255 #if XBUILD_14
 256                         AddToolset (new Toolset ("14.0", ToolLocationHelper.GetPathToBuildTools ("14.0"), this, null));
 257 #endif
 258
 259                         // We don't support these anymore
 260                         AddToolset (new Toolset ("2.0",
 261                                 ToolLocationHelper.GetPathToDotNetFramework (TargetDotNetFrameworkVersion.Version20), this, null));
 262                         AddToolset (new Toolset ("3.0",
 263                                 ToolLocationHelper.GetPathToDotNetFramework (TargetDotNetFrameworkVersion.Version30), this, null));
 264                         AddToolset (new Toolset ("3.5",
 265                                 ToolLocationHelper.GetPathToDotNetFramework (TargetDotNetFrameworkVersion.Version35), this, null));
 266
 267                         default_tools_version = toolsets [0].ToolsVersion;
 268                 }
 269
 270                 [MonoTODO ("not verified at all")]
 271                 public void AddToolset (Toolset toolset)
 272                 {
 273                         toolsets.Add (toolset);
 274                 }
 275
 276                 [MonoTODO ("not verified at all")]
 277                 public void RemoveAllToolsets ()
 278                 {
 279                         toolsets.Clear ();
 280                 }
 281
 282                 public void RegisterLogger (ILogger logger)
 283                 {
 284                         loggers.Add (logger);
 285                 }
 286
 287                 public void RegisterLoggers (IEnumerable<ILogger> loggers)
 288                 {
 289                         foreach (var logger in loggers)
 290                                 this.loggers.Add (logger);
 291                 }
 292
 293                 public void UnloadAllProjects ()
 294                 {
 295                         throw new NotImplementedException ();
 296                 }
 297
 298                 [MonoTODO ("Not verified at all")]
 299                 public void UnloadProject (Project project)
 300                 {
 301                         this.loaded_projects.Remove (project);
 302                 }
 303
 304                 [MonoTODO ("Not verified at all")]
 305                 public void UnloadProject (ProjectRootElement projectRootElement)
 306                 {
 307                         foreach (var proj in loaded_projects.Where (p => p.Xml == projectRootElement).ToArray ())
 308                                 UnloadProject (proj);
 309                 }
 310
 311                 public static Version Version {
 312                         get { throw new NotImplementedException (); }
 313                 }
 314
 315                 // Execution part
 316
 317                 [MonoTODO]
 318                 public bool DisableMarkDirty { get; set; }
 319
 320                 [MonoTODO]
 321                 public HostServices HostServices { get; set; }
 322
 323                 [MonoTODO]
 324                 public bool IsBuildEnabled { get; set; }
 325
 326                 internal string BuildStartupDirectory { get; set; }
 327
 328                 internal int MaxNodeCount { get; private set; }
 329
 330                 Stack<string> ongoing_imports = new Stack<string> ();
 331
 332                 internal Stack<string> OngoingImports {
 333                         get { return ongoing_imports; }
 334                 }
 335
 336                 // common part
 337                 internal static IEnumerable<EnvironmentProjectProperty> GetWellKnownProperties (Project project)
 338                 {
 339                         Func<string,string,EnvironmentProjectProperty> create = (name, value) => new EnvironmentProjectProperty (project, name, value, true);
 340                         return GetWellKnownProperties (create);
 341                 }
 342
 343                 internal static IEnumerable<ProjectPropertyInstance> GetWellKnownProperties (ProjectInstance project)
 344                 {
 345                         Func<string,string,ProjectPropertyInstance> create = (name, value) => new ProjectPropertyInstance (name, true, value);
 346                         return GetWellKnownProperties (create);
 347                 }
 348
 349                 static IEnumerable<T> GetWellKnownProperties<T> (Func<string,string,T> create)
 350                 {
 351                         yield return create ("OS", OS);
 352                         var ext = Environment.GetEnvironmentVariable ("MSBuildExtensionsPath") ?? DefaultExtensionsPath;
 353                         yield return create ("MSBuildExtensionsPath", ext);
 354                         var ext32 = Environment.GetEnvironmentVariable ("MSBuildExtensionsPath32") ?? ext;
 355                         yield return create ("MSBuildExtensionsPath32", ext32);
 356                         var ext64 = Environment.GetEnvironmentVariable ("MSBuildExtensionsPath64") ?? ext;
 357                         yield return create ("MSBuildExtensionsPath64", ext64);
 358                 }
 359
 360                 static string OS {
 361                         get {
 362                                 PlatformID pid = Environment.OSVersion.Platform;
 363                                 switch ((int) pid) {
 364                                 case 128:
 365                                 case 4:
 366                                         return "Unix";
 367                                 case 6:
 368                                         return "OSX";
 369                                 default:
 370                                         return "Windows_NT";
 371                                 }
 372                         }
 373                 }
 374
 375                 #region Extension Paths resolution
 376
 377                 static string extensions_path;
 378                 internal static string DefaultExtensionsPath {
 379                         get {
 380                                 if (extensions_path == null) {
 381                                         // NOTE: code from mcs/tools/gacutil/driver.cs
 382                                         PropertyInfo gac = typeof (System.Environment).GetProperty (
 383                                                         "GacPath", BindingFlags.Static | BindingFlags.NonPublic);
 384
 385                                         if (gac != null) {
 386                                                 MethodInfo get_gac = gac.GetGetMethod (true);
 387                                                 string gac_path = (string) get_gac.Invoke (null, null);
 388                                                 extensions_path = Path.GetFullPath (Path.Combine (
 389                                                                         gac_path, Path.Combine ("..", "xbuild")));
 390                                         }
 391                                 }
 392                                 return extensions_path;
 393                         }
 394                 }
 395
 396                 static string DotConfigExtensionsPath = Path.Combine (Environment.GetFolderPath (Environment.SpecialFolder.ApplicationData),
 397                         Path.Combine ("xbuild", "tasks"));
 398                 const string MacOSXExternalXBuildDir = "/Library/Frameworks/Mono.framework/External/xbuild";
 399                 static string PathSeparatorAsString = Path.PathSeparator.ToString ();
 400
 401                 // Gives a list of extensions paths to try for $(MSBuildExtensionsPath),
 402                 // *in-order*
 403                 internal static IEnumerable<string> GetApplicableExtensionsPaths (Action<string> logMessage)
 404                 {
 405                         string envvar = String.Join (PathSeparatorAsString, new string [] {
 406                                 // For mac osx, look in the 'External' dir on macosx,
 407                                 // see bug #663180
 408                                 MSBuildUtils.RunningOnMac ? MacOSXExternalXBuildDir : String.Empty,
 409                                 DotConfigExtensionsPath,
 410                                 DefaultExtensionsPath});
 411
 412                         var pathsTable = new Dictionary<string, string> ();
 413                         foreach (string extn_path in envvar.Split (new char [] {Path.PathSeparator}, StringSplitOptions.RemoveEmptyEntries)) {
 414                                 if (pathsTable.ContainsKey (extn_path))
 415                                         continue;
 416
 417                                 if (!Directory.Exists (extn_path)) {
 418                                         logMessage (string.Format ("Extension path '{0}' not found, ignoring.", extn_path));
 419                                         continue;
 420                                 }
 421
 422                                 pathsTable [extn_path] = extn_path;
 423                                 yield return extn_path;
 424                         }
 425                 }
 426
 427                 internal static string FindFileInSeveralExtensionsPath (ref string extensionsPathOverride, Func<string,string> expandString, string file, Action<string> logMessage)
 428                 {
 429                         string ret = null;
 430                         string ex = extensionsPathOverride;
 431                         Func<bool> action = () => {
 432                                 string path = WindowsCompatibilityExtensions.FindMatchingPath (expandString (file));
 433                                 if (File.Exists (path))
 434                                         ret = path;
 435                                 else
 436                                         return false;
 437                                 return true;
 438                         };
 439
 440                         try {
 441                                 if (!action ()) {
 442                                         foreach (var s in ProjectCollection.GetApplicableExtensionsPaths (logMessage)) {
 443                                                 extensionsPathOverride = s;
 444                                                 ex = s;
 445                                                 if (action ())
 446                                                         break;
 447                                         }
 448                                 }
 449                         } finally {
 450                                 extensionsPathOverride = null;
 451                         }
 452
 453                         return ret ?? WindowsCompatibilityExtensions.FindMatchingPath (expandString (file));
 454                 }
 455
 456                 #endregion
 457
 458                 internal IEnumerable<ReservedProjectProperty> GetReservedProperties (Toolset toolset, Project project)
 459                 {
 460                         Func<string,Func<string>,ReservedProjectProperty> create = (name, value) => new ReservedProjectProperty (project, name, value);
 461                         return GetReservedProperties<ReservedProjectProperty> (toolset, project.Xml, create, () => project.FullPath);
 462                 }
 463
 464                 internal IEnumerable<ProjectPropertyInstance> GetReservedProperties (Toolset toolset, ProjectInstance project, ProjectRootElement xml)
 465                 {
 466                         Func<string,Func<string>,ProjectPropertyInstance> create = (name, value) => new ProjectPropertyInstance (name, true, null, value);
 467                         return GetReservedProperties<ProjectPropertyInstance> (toolset, xml, create, () => project.FullPath);
 468                 }
 469
 470                 // seealso http://msdn.microsoft.com/en-us/library/ms164309.aspx
 471                 IEnumerable<T> GetReservedProperties<T> (Toolset toolset, ProjectRootElement project, Func<string,Func<string>,T> create, Func<string> projectFullPath)
 472                 {
 473                         yield return create ("MSBuildBinPath", () => toolset.ToolsPath);
 474                         // FIXME: add MSBuildLastTaskResult
 475                         // FIXME: add MSBuildNodeCount
 476                         // FIXME: add MSBuildProgramFiles32
 477                         yield return create ("MSBuildProjectDefaultTargets", () => project.DefaultTargets);
 478                         yield return create ("MSBuildProjectDirectory", () => project.DirectoryPath + Path.DirectorySeparatorChar);
 479                         yield return create ("MSBuildProjectDirectoryNoRoot", () => project.DirectoryPath.Substring (Path.GetPathRoot (project.DirectoryPath).Length));
 480                         yield return create ("MSBuildProjectExtension", () => Path.GetExtension (project.FullPath));
 481                         yield return create ("MSBuildProjectFile", () => Path.GetFileName (project.FullPath));
 482                         yield return create ("MSBuildProjectFullPath", () => project.FullPath);
 483                         yield return create ("MSBuildProjectName", () => Path.GetFileNameWithoutExtension (project.FullPath));
 484                         yield return create ("MSBuildStartupDirectory", () => BuildStartupDirectory);
 485                         yield return create ("MSBuildThisFile", () => Path.GetFileName (GetEvaluationTimeThisFile (projectFullPath)));
 486                         yield return create ("MSBuildThisFileFullPath", () => GetEvaluationTimeThisFile (projectFullPath));
 487                         yield return create ("MSBuildThisFileName", () => Path.GetFileNameWithoutExtension (GetEvaluationTimeThisFile (projectFullPath)));
 488                         yield return create ("MSBuildThisFileExtension", () => Path.GetExtension (GetEvaluationTimeThisFile (projectFullPath)));
 489
 490                         yield return create ("MSBuildThisFileDirectory", () => Path.GetDirectoryName (GetEvaluationTimeThisFileDirectory (projectFullPath)));
 491                         yield return create ("MSBuildThisFileDirectoryNoRoot", () => {
 492                                 string dir = GetEvaluationTimeThisFileDirectory (projectFullPath) + Path.DirectorySeparatorChar;
 493                                 return dir.Substring (Path.GetPathRoot (dir).Length);
 494                                 });
 495                         yield return create ("MSBuildToolsPath", () => toolset.ToolsPath);
 496                         yield return create ("MSBuildToolsVersion", () => toolset.ToolsVersion);
 497
 498                         // This is an implementation specific special property for this Microsoft.Build.dll to differentiate
 499                         // the build from Microsoft.Build.Engine.dll. It is significantly used in some *.targets file we share
 500                         // between old and new build engine.
 501                         yield return create ("MonoUseMicrosoftBuildDll", () => "True");
 502                 }
 503
 504                 // These are required for reserved property, represents dynamically changing property values.
 505                 // This should resolve to either the project file path or that of the imported file.
 506                 internal string GetEvaluationTimeThisFileDirectory (Func<string> nonImportingTimeFullPath)
 507                 {
 508                         var file = GetEvaluationTimeThisFile (nonImportingTimeFullPath);
 509                         var dir = Path.IsPathRooted (file) ? Path.GetDirectoryName (file) : Directory.GetCurrentDirectory ();
 510                         return dir + Path.DirectorySeparatorChar;
 511                 }
 512
 513                 internal string GetEvaluationTimeThisFile (Func<string> nonImportingTimeFullPath)
 514                 {
 515                         return OngoingImports.Count > 0 ? OngoingImports.Peek () : (nonImportingTimeFullPath () ?? string.Empty);
 516                 }
 517
 518                 static readonly char [] item_target_sep = {';'};
 519
 520                 internal static IEnumerable<T> GetAllItems<T> (Func<string,string> expandString, string include, string exclude, Func<string,T> creator, Func<string,ITaskItem> taskItemCreator, string directory, Action<T,string> assignRecurse, Func<ITaskItem,bool> isDuplicate)
 521                 {
 522                         var includes = expandString (include).Trim ().Split (item_target_sep, StringSplitOptions.RemoveEmptyEntries);
 523                         var excludes = expandString (exclude).Trim ().Split (item_target_sep, StringSplitOptions.RemoveEmptyEntries);
 524
 525                         if (includes.Length == 0)
 526                                 yield break;
 527                         if (includes.Length == 1 && includes [0].IndexOf ('*') < 0 && excludes.Length == 0) {
 528                                 // for most case - shortcut.
 529                                 var item = creator (includes [0]);
 530                                 yield return item;
 531                         } else {
 532                                 var ds = new Microsoft.Build.BuildEngine.DirectoryScanner () {
 533                                         BaseDirectory = new DirectoryInfo (directory),
 534                                         Includes = includes.Where (s => !string.IsNullOrWhiteSpace (s)).Select (i => taskItemCreator (i)).ToArray (),
 535                                         Excludes = excludes.Where (s => !string.IsNullOrWhiteSpace (s)).Select (e => taskItemCreator (e)).ToArray (),
 536                                 };
 537                                 ds.Scan ();
 538                                 foreach (var taskItem in ds.MatchedItems) {
 539                                         if (isDuplicate (taskItem))
 540                                                 continue; // skip duplicate
 541                                         var item = creator (taskItem.ItemSpec);
 542                                         string recurse = taskItem.GetMetadata ("RecursiveDir");
 543                                         assignRecurse (item, recurse);
 544                                         yield return item;
 545                                 }
 546                         }
 547                 }
 548
 549                 static readonly char [] path_sep = {Path.DirectorySeparatorChar, Path.AltDirectorySeparatorChar};
 550
 551                 internal static string GetWellKnownMetadata (string name, string file, Func<string,string> getFullPath, string recursiveDir)
 552                 {
 553                         switch (name.ToLower (CultureInfo.InvariantCulture)) {
 554                         case "fullpath":
 555                                 return getFullPath (file);
 556                         case "rootdir":
 557                                 return Path.GetPathRoot (getFullPath (file));
 558                         case "filename":
 559                                 return Path.GetFileNameWithoutExtension (file);
 560                         case "extension":
 561                                 return Path.GetExtension (file);
 562                         case "relativedir":
 563                                         var idx = file.LastIndexOfAny (path_sep);
 564                                         return idx < 0 ? string.Empty : file.Substring (0, idx + 1);
 565                         case "directory":
 566                                         var fp = getFullPath (file);
 567                                         return Path.GetDirectoryName (fp).Substring (Path.GetPathRoot (fp).Length);
 568                         case "recursivedir":
 569                                 return recursiveDir;
 570                         case "identity":
 571                                 return file;
 572                         case "modifiedtime":
 573                                 return new FileInfo (getFullPath (file)).LastWriteTime.ToString ("yyyy-MM-dd HH:mm:ss.fffffff");
 574                         case "createdtime":
 575                                 return new FileInfo (getFullPath (file)).CreationTime.ToString ("yyyy-MM-dd HH:mm:ss.fffffff");
 576                         case "accessedtime":
 577                                 return new FileInfo (getFullPath (file)).LastAccessTime.ToString ("yyyy-MM-dd HH:mm:ss.fffffff");
 578                         }
 579                         return null;
 580                 }
 581         }
 582 }