mcs/class/Microsoft.Build/Microsoft.Build.Internal/BuildEngine4.cs

   1 //
   2 // BuildEngine4.cs
   3 //
   4 // Author:
   5 //   Atsushi Enomoto (atsushi@xamarin.com)
   6 //
   7 // Copyright (C) 2013 Xamarin Inc. (http://www.xamarin.com)
   8 //
   9 // Permission is hereby granted, free of charge, to any person obtaining
  10 // a copy of this software and associated documentation files (the
  11 // "Software"), to deal in the Software without restriction, including
  12 // without limitation the rights to use, copy, modify, merge, publish,
  13 // distribute, sublicense, and/or sell copies of the Software, and to
  14 // permit persons to whom the Software is furnished to do so, subject to
  15 // the following conditions:
  16 //
  17 // The above copyright notice and this permission notice shall be
  18 // included in all copies or substantial portions of the Software.
  19 //
  20 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  21 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  22 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  23 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  24 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  25 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  26 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  27 //
  28 using System;
  29 using System.Collections;
  30 using System.Collections.Generic;
  31 using Microsoft.Build.Execution;
  32 using Microsoft.Build.Framework;
  33 using Microsoft.Build.Evaluation;
  34 using System.Linq;
  35 using System.IO;
  36 using Microsoft.Build.Exceptions;
  37 using System.Globalization;
  38 using Microsoft.Build.Construction;
  39
  40 namespace Microsoft.Build.Internal
  41 {
  42         class BuildEngine4
  43 #if NET_4_5
  44                 : IBuildEngine4
  45 #else
  46                 : IBuildEngine3
  47 #endif
  48         {
  49                 public BuildEngine4 (BuildSubmission submission)
  50                 {
  51                         this.submission = submission;
  52                         event_source = new Microsoft.Build.BuildEngine.EventSource ();
  53                         if (submission.BuildManager.OngoingBuildParameters.Loggers != null)
  54                                 foreach (var l in submission.BuildManager.OngoingBuildParameters.Loggers)
  55                                         l.Initialize (event_source);
  56                 }
  57
  58                 BuildSubmission submission;
  59                 ProjectInstance project;
  60                 ProjectTaskInstance current_task;
  61                 Microsoft.Build.BuildEngine.EventSource event_source;
  62
  63                 public ProjectCollection Projects {
  64                         get { return submission.BuildManager.OngoingBuildParameters.ProjectCollection; }
  65                 }
  66
  67                 // FIXME:
  68                 // While we are not faced to implement those features, there are some modern task execution requirements.
  69                 //
  70                 // This will have to be available for "out of process" nodes (see NodeAffinity).
  71                 // NodeAffinity is set per project file at BuildManager.HostServices.
  72                 // When NodeAffinity is set to OutOfProc, it should probably launch different build host
  73                 // that runs separate build tasks. (.NET has MSBuildTaskHost.exe which I guess is about that.)
  74                 //
  75                 // Also note that the complete implementation has to support LoadInSeparateAppDomainAttribute
  76                 // (which is most likely derived from AppDomainIsolatedBuildTask) that marks a task to run
  77                 // in separate AppDomain.
  78                 //
  79                 public void BuildProject (Func<bool> checkCancel, BuildResult result, ProjectInstance project, IEnumerable<string> targetNames, IDictionary<string,string> globalProperties, IDictionary<string,string> targetOutputs, string toolsVersion)
  80                 {
  81                         if (toolsVersion == null)
  82                                 throw new ArgumentNullException ("toolsVersion");
  83
  84                         var parameters = submission.BuildManager.OngoingBuildParameters;
  85                         var toolset = parameters.GetToolset (toolsVersion);
  86                         if (toolset == null)
  87                                 throw new InvalidOperationException (string.Format ("Toolset version '{0}' was not resolved to valid toolset", toolsVersion));
  88                         LogMessageEvent (new BuildMessageEventArgs (string.Format ("Using Toolset version {0}.", toolsVersion), null, null, MessageImportance.Low));
  89                         var buildTaskFactory = new BuildTaskFactory (BuildTaskDatabase.GetDefaultTaskDatabase (toolset), submission.BuildRequest.ProjectInstance.TaskDatabase);
  90                         BuildProject (new InternalBuildArguments () { CheckCancel = checkCancel, Result = result, Project = project, TargetNames = targetNames, GlobalProperties = globalProperties, TargetOutputs = targetOutputs, ToolsVersion = toolsVersion, BuildTaskFactory = buildTaskFactory });
  91                 }
  92
  93                 class InternalBuildArguments
  94                 {
  95                         public Func<bool> CheckCancel;
  96                         public BuildResult Result;
  97                         public ProjectInstance Project;
  98                         public IEnumerable<string> TargetNames;
  99                         public IDictionary<string,string> GlobalProperties;
 100                         public IDictionary<string,string> TargetOutputs;
 101                         public string ToolsVersion;
 102                         public BuildTaskFactory BuildTaskFactory;
 103
 104                         public void AddTargetResult (string targetName, TargetResult targetResult)
 105                         {
 106                                 if (!Result.HasResultsForTarget (targetName))
 107                                         Result.AddResultsForTarget (targetName, targetResult);
 108                         }
 109                 }
 110
 111                 void BuildProject (InternalBuildArguments args)
 112                 {
 113                         var request = submission.BuildRequest;
 114                         var parameters = submission.BuildManager.OngoingBuildParameters;
 115                         this.project = args.Project;
 116
 117                         string directoryBackup = Directory.GetCurrentDirectory ();
 118                         Directory.SetCurrentDirectory (project.Directory);
 119                         event_source.FireBuildStarted (this, new BuildStartedEventArgs ("Build Started", null, DateTime.Now));
 120
 121                         try {
 122
 123                                 var initialPropertiesFormatted = "Initial Properties:\n" + string.Join (Environment.NewLine, project.Properties.OrderBy (p => p.Name).Select (p => string.Format ("{0} = {1}", p.Name, p.EvaluatedValue)).ToArray ());
 124                                 LogMessageEvent (new BuildMessageEventArgs (initialPropertiesFormatted, null, null, MessageImportance.Low));
 125                                 var initialItemsFormatted = "Initial Items:\n" + string.Join (Environment.NewLine, project.Items.OrderBy (i => i.ItemType).Select (i => string.Format ("{0} : {1}", i.ItemType, i.EvaluatedInclude)).ToArray ());
 126                                 LogMessageEvent (new BuildMessageEventArgs (initialItemsFormatted, null, null, MessageImportance.Low));
 127
 128                                 // null targets -> success. empty targets -> success(!)
 129                                 if (request.TargetNames == null)
 130                                         args.Result.OverallResult = BuildResultCode.Success;
 131                                 else {
 132                                         foreach (var targetName in (args.TargetNames ?? request.TargetNames).Where (t => t != null))
 133                                                 BuildTargetByName (targetName, args);
 134
 135                                         // FIXME: check .NET behavior, whether cancellation always results in failure.
 136                                         args.Result.OverallResult = args.CheckCancel () ? BuildResultCode.Failure : args.Result.ResultsByTarget.Any (p => p.Value.ResultCode == TargetResultCode.Failure) ? BuildResultCode.Failure : BuildResultCode.Success;
 137                                 }
 138                         } catch (Exception ex) {
 139                                 args.Result.OverallResult = BuildResultCode.Failure;
 140                                 LogErrorEvent (new BuildErrorEventArgs (null, null, project.FullPath, 0, 0, 0, 0, "Unhandled exception occured during a build", null, null));
 141                                 LogMessageEvent (new BuildMessageEventArgs ("Exception details: " + ex, null, null, MessageImportance.Low));
 142                                 throw; // BuildSubmission re-catches this.
 143                         } finally {
 144                                 event_source.FireBuildFinished (this, new BuildFinishedEventArgs ("Build Finished.", null, args.Result.OverallResult == BuildResultCode.Success, DateTime.Now));
 145                                 Directory.SetCurrentDirectory (directoryBackup);
 146                         }
 147                 }
 148
 149                 bool BuildTargetByName (string targetName, InternalBuildArguments args)
 150                 {
 151                         var request = submission.BuildRequest;
 152                         var parameters = submission.BuildManager.OngoingBuildParameters;
 153                         ProjectTargetInstance target;
 154                         TargetResult dummyResult;
 155
 156                         if (args.Result.ResultsByTarget.TryGetValue (targetName, out dummyResult) && dummyResult.ResultCode == TargetResultCode.Success) {
 157                                 LogMessageEvent (new BuildMessageEventArgs (string.Format ("Target '{0}' was skipped because it was already built successfully.", targetName), null, null, MessageImportance.Low));
 158                                 return true; // do not add result.
 159                         }
 160
 161                         var targetResult = new TargetResult ();
 162
 163                         // null key is allowed and regarded as blind success(!) (as long as it could retrieve target)
 164                         if (!request.ProjectInstance.Targets.TryGetValue (targetName, out target))
 165                                 // FIXME: from MSBuild.exe it is given MSB4057. Can we assign a number too?
 166                                 throw new InvalidOperationException (string.Format ("target '{0}' was not found in project '{1}'", targetName, project.FullPath));
 167                         else if (!args.Project.EvaluateCondition (target.Condition)) {
 168                                 LogMessageEvent (new BuildMessageEventArgs (string.Format ("Target '{0}' was skipped because condition '{1}' was not met.", target.Name, target.Condition), null, null, MessageImportance.Low));
 169                                 targetResult.Skip ();
 170                         } else {
 171                                 // process DependsOnTargets first.
 172                                 foreach (var dep in project.ExpandString (target.DependsOnTargets).Split (';').Select (s => s.Trim ()).Where (s => !string.IsNullOrEmpty (s))) {
 173                                         LogMessageEvent (new BuildMessageEventArgs (string.Format ("Target '{0}' depends on '{1}'.", target.Name, dep), null, null, MessageImportance.Low));
 174                                         if (!BuildTargetByName (dep, args)) {
 175                                                 LogMessageEvent (new BuildMessageEventArgs (string.Format ("Quit target '{0}', as dependency target '{1}' has failed.", target.Name, dep), null, null, MessageImportance.Low));
 176                                                 return false;
 177                                         }
 178                                 }
 179
 180                                 Func<string,ITaskItem> creator = s => new TargetOutputTaskItem () { ItemSpec = s };
 181
 182                                 event_source.FireTargetStarted (this, new TargetStartedEventArgs ("Target Started", null, target.Name, project.FullPath, target.FullPath));
 183                                 try {
 184                                         // FIXME: examine in which scenario Inputs/Outputs inconsistency results in errors. Now it rather prevents csproj build.
 185                                         /*if (!string.IsNullOrEmpty (target.Inputs) != !string.IsNullOrEmpty (target.Outputs)) {
 186                                                 targetResult.Failure (new InvalidProjectFileException (target.Location, null, string.Format ("Target {0} has mismatching Inputs and Outputs specification. When one is specified, another one has to be specified too.", targetName), null, null, null));
 187                                         } else*/ {
 188                                                 bool skip = false;
 189                                                 if (!string.IsNullOrEmpty (target.Inputs)) {
 190                                                         var inputs = args.Project.GetAllItems (target.Inputs, string.Empty, creator, creator, s => true, (t, s) => {
 191                                                         });
 192                                                         if (!inputs.Any ()) {
 193                                                                 LogMessageEvent (new BuildMessageEventArgs (string.Format ("Target '{0}' was skipped because there is no input.", target.Name), null, null, MessageImportance.Low));
 194                                                                 skip = true;
 195                                                         } else {
 196                                                                 var outputs = args.Project.GetAllItems (target.Outputs, string.Empty, creator, creator, s => true, (t, s) => {
 197                                                                 });
 198                                                                 var needsUpdates = GetOlderOutputsThanInputs (inputs, outputs).FirstOrDefault ();
 199                                                                 if (needsUpdates != null)
 200                                                                         LogMessageEvent (new BuildMessageEventArgs (string.Format ("Target '{0}' needs to be built because new output {1} is needed.", target.Name, needsUpdates.ItemSpec), null, null, MessageImportance.Low));
 201                                                                 else {
 202                                                                         LogMessageEvent (new BuildMessageEventArgs (string.Format ("Target '{0}' was skipped because all the outputs are newer than all the inputs.", target.Name), null, null, MessageImportance.Low));
 203                                                                         skip = true;
 204                                                                 }
 205                                                         }
 206                                                 }
 207                                                 if (skip) {
 208                                                         targetResult.Skip ();
 209                                                 } else {
 210                                                         if (DoBuildTarget (target, targetResult, args)) {
 211                                                                 var items = args.Project.GetAllItems (target.Outputs, string.Empty, creator, creator, s => true, (t, s) => {
 212                                                                 });
 213                                                                 targetResult.Success (items);
 214                                                         }
 215                                                 }
 216                                         }
 217                                 } finally {
 218                                         event_source.FireTargetFinished (this, new TargetFinishedEventArgs ("Target Finished", null, targetName, project.FullPath, target.FullPath, targetResult.ResultCode != TargetResultCode.Failure));
 219                                 }
 220                         }
 221                         args.AddTargetResult (targetName, targetResult);
 222
 223                         return targetResult.ResultCode != TargetResultCode.Failure;
 224                 }
 225
 226                 IEnumerable<ITaskItem> GetOlderOutputsThanInputs (IEnumerable<ITaskItem> inputs, IEnumerable<ITaskItem> outputs)
 227                 {
 228                         return outputs.Where (o => !File.Exists (o.GetMetadata ("FullPath")) || inputs.Any (i => string.CompareOrdinal (i.GetMetadata ("LastModifiedTime"), o.GetMetadata ("LastModifiedTime")) > 0));
 229                 }
 230
 231                 // FIXME: Exception should be caught at caller site.
 232                 bool DoBuildTarget (ProjectTargetInstance target, TargetResult targetResult, InternalBuildArguments args)
 233                 {
 234                         var request = submission.BuildRequest;
 235
 236                         // Here we check cancellation (only after TargetStarted event).
 237                         if (args.CheckCancel ()) {
 238                                 targetResult.Failure (new BuildAbortedException ("Build has canceled"));
 239                                 return false;
 240                         }
 241
 242                         var propsToRestore = new Dictionary<string,string> ();
 243                         var itemsToRemove = new List<ProjectItemInstance> ();
 244                         try {
 245                                 // Evaluate additional target properties
 246                                 foreach (var c in target.Children.OfType<ProjectPropertyGroupTaskInstance> ()) {
 247                                         if (!args.Project.EvaluateCondition (c.Condition))
 248                                                 continue;
 249                                         foreach (var p in c.Properties) {
 250                                                 if (!args.Project.EvaluateCondition (p.Condition))
 251                                                         continue;
 252                                                 var value = args.Project.ExpandString (p.Value);
 253                                                 propsToRestore.Add (p.Name, project.GetPropertyValue (value));
 254                                                 project.SetProperty (p.Name, value);
 255                                         }
 256                                 }
 257
 258                                 // Evaluate additional target items
 259                                 foreach (var c in target.Children.OfType<ProjectItemGroupTaskInstance> ()) {
 260                                         if (!args.Project.EvaluateCondition (c.Condition))
 261                                                 continue;
 262                                         foreach (var item in c.Items) {
 263                                                 if (!args.Project.EvaluateCondition (item.Condition))
 264                                                         continue;
 265                                                 Func<string,ProjectItemInstance> creator = i => new ProjectItemInstance (project, item.ItemType, item.Metadata.Select (m => new KeyValuePair<string,string> (m.Name, m.Value)), i);
 266                                                 foreach (var ti in project.GetAllItems (item.Include, item.Exclude, creator, creator, s => s == item.ItemType, (ti, s) => ti.SetMetadata ("RecurseDir", s)))
 267                                                         itemsToRemove.Add (ti);
 268                                         }
 269                                 }
 270
 271                                 // run tasks
 272                                 foreach (var ti in target.Children.OfType<ProjectTaskInstance> ()) {
 273                                         current_task = ti;
 274                                         if (!args.Project.EvaluateCondition (ti.Condition)) {
 275                                                 LogMessageEvent (new BuildMessageEventArgs (string.Format ("Task '{0}' was skipped because condition '{1}' wasn't met.", ti.Name, ti.Condition), null, null, MessageImportance.Low));
 276                                                 continue;
 277                                         }
 278                                         if (!RunBuildTask (target, ti, targetResult, args))
 279                                                 return false;
 280                                 }
 281                         } catch (Exception ex) {
 282                                 // fallback task specified by OnError element
 283                                 foreach (var c in target.Children.OfType<ProjectOnErrorInstance> ()) {
 284                                         if (!args.Project.EvaluateCondition (c.Condition))
 285                                                 continue;
 286                                         foreach (var fallbackTarget in project.ExpandString (c.ExecuteTargets).Split (';'))
 287                                                 BuildTargetByName (fallbackTarget, args);
 288                                 }
 289                                 int line = target.Location != null ? target.Location.Line : 0;
 290                                 int col = target.Location != null ? target.Location.Column : 0;
 291                                 LogErrorEvent (new BuildErrorEventArgs (null, null, target.FullPath, line, col, 0, 0, ex.Message, null, null));
 292                                 targetResult.Failure (ex);
 293                                 return false;
 294                         } finally {
 295                                 // restore temporary property state to the original state.
 296                                 foreach (var p in propsToRestore) {
 297                                         if (p.Value == string.Empty)
 298                                                 project.RemoveProperty (p.Key);
 299                                         else
 300                                                 project.SetProperty (p.Key, p.Value);
 301                                 }
 302                                 foreach (var item in itemsToRemove)
 303                                         project.RemoveItem (item);
 304                         }
 305                         return true;
 306                 }
 307
 308                 bool RunBuildTask (ProjectTargetInstance target, ProjectTaskInstance taskInstance, TargetResult targetResult, InternalBuildArguments args)
 309                 {
 310                         var request = submission.BuildRequest;
 311
 312                         var host = request.HostServices == null ? null : request.HostServices.GetHostObject (request.ProjectFullPath, target.Name, taskInstance.Name);
 313
 314                         // Create Task instance.
 315                         var factoryIdentityParameters = new Dictionary<string,string> ();
 316                         #if NET_4_5
 317                         factoryIdentityParameters ["MSBuildRuntime"] = taskInstance.MSBuildRuntime;
 318                         factoryIdentityParameters ["MSBuildArchitecture"] = taskInstance.MSBuildArchitecture;
 319                         #endif
 320                         var task = args.BuildTaskFactory.CreateTask (taskInstance.Name, factoryIdentityParameters, this);
 321                         LogMessageEvent (new BuildMessageEventArgs (string.Format ("Using task {0} from {1}", taskInstance.Name, task.GetType ().AssemblyQualifiedName), null, null, MessageImportance.Low));
 322                         task.HostObject = host;
 323                         task.BuildEngine = this;
 324
 325                         // Prepare task parameters.
 326                         var evaluatedTaskParams = taskInstance.Parameters.Select (p => new KeyValuePair<string,string> (p.Key, project.ExpandString (p.Value)));
 327
 328                         var requiredProps = task.GetType ().GetProperties ()
 329                                 .Where (p => p.CanWrite && p.GetCustomAttributes (typeof (RequiredAttribute), true).Any ());
 330                         var missings = requiredProps.Where (p => !evaluatedTaskParams.Any (tp => tp.Key.Equals (p.Name, StringComparison.OrdinalIgnoreCase)));
 331                         if (missings.Any ())
 332                                 throw new InvalidOperationException (string.Format ("Task {0} of type {1} is used without specifying mandatory property: {2}",
 333                                         taskInstance.Name, task.GetType (), string.Join (", ", missings.Select (p => p.Name).ToArray ())));
 334
 335                         foreach (var p in evaluatedTaskParams) {
 336                                 switch (p.Key.ToLower ()) {
 337                                 case "condition":
 338                                 case "continueonerror":
 339                                         continue;
 340                                 }
 341                                 var prop = task.GetType ().GetProperty (p.Key);
 342                                 if (prop == null)
 343                                         throw new InvalidOperationException (string.Format ("Task {0} does not have property {1}", taskInstance.Name, p.Key));
 344                                 if (!prop.CanWrite)
 345                                         throw new InvalidOperationException (string.Format ("Task {0} has property {1} but it is read-only.", taskInstance.Name, p.Key));
 346                                 if (string.IsNullOrEmpty (p.Value) && !requiredProps.Contains (prop))
 347                                         continue;
 348                                 try {
 349                                         var valueInstance = ConvertTo (p.Value, prop.PropertyType);
 350                                         prop.SetValue (task, valueInstance, null);
 351                                 } catch (Exception ex) {
 352                                         throw new InvalidOperationException (string.Format ("Failed to convert '{0}' for property '{1}' of type {2}", p.Value, prop.Name, prop.PropertyType), ex);
 353                                 }
 354                         }
 355
 356                         // Do execute task.
 357                         bool taskSuccess = false;
 358                         event_source.FireTaskStarted (this, new TaskStartedEventArgs ("Task Started", null, project.FullPath, taskInstance.FullPath, taskInstance.Name));
 359                         try {
 360                                 taskSuccess = task.Execute ();
 361
 362                                 if (!taskSuccess) {
 363                                         targetResult.Failure (null);
 364                                         if (!ContinueOnError) {
 365                                                 return false;
 366                                         }
 367                                 } else {
 368                                         // Evaluate task output properties and items.
 369                                         foreach (var to in taskInstance.Outputs) {
 370                                                 if (!project.EvaluateCondition (to.Condition))
 371                                                         continue;
 372                                                 var toItem = to as ProjectTaskOutputItemInstance;
 373                                                 var toProp = to as ProjectTaskOutputPropertyInstance;
 374                                                 string taskParameter = toItem != null ? toItem.TaskParameter : toProp.TaskParameter;
 375                                                 var pi = task.GetType ().GetProperty (taskParameter);
 376                                                 if (pi == null)
 377                                                         throw new InvalidOperationException (string.Format ("Task {0} does not have property {1} specified as TaskParameter", taskInstance.Name, toItem.TaskParameter));
 378                                                 if (!pi.CanRead)
 379                                                         throw new InvalidOperationException (string.Format ("Task {0} has property {1} specified as TaskParameter, but it is write-only", taskInstance.Name, toItem.TaskParameter));
 380                                                 var value = ConvertFrom (pi.GetValue (task, null));
 381                                                 if (toItem != null) {
 382                                                         LogMessageEvent (new BuildMessageEventArgs (string.Format ("Output Item {0} from TaskParameter {1}: {2}", toItem.ItemType, toItem.TaskParameter, value), null, null, MessageImportance.Low));
 383                                                         foreach (var item in value.Split (';'))
 384                                                                 args.Project.AddItem (toItem.ItemType, item);
 385                                                 } else {
 386                                                         LogMessageEvent (new BuildMessageEventArgs (string.Format ("Output Property {0} from TaskParameter {1}: {2}", toProp.PropertyName, toProp.TaskParameter, value), null, null, MessageImportance.Low));
 387                                                         args.Project.SetProperty (toProp.PropertyName, value);
 388                                                 }
 389                                         }
 390                                 }
 391                         } finally {
 392                                 event_source.FireTaskFinished (this, new TaskFinishedEventArgs ("Task Finished", null, project.FullPath, taskInstance.FullPath, taskInstance.Name, taskSuccess));
 393                         }
 394                         return true;
 395                 }
 396
 397                 object ConvertTo (string source, Type targetType)
 398                 {
 399                         if (targetType == typeof(ITaskItem) || targetType.IsSubclassOf (typeof(ITaskItem)))
 400                                 return new TargetOutputTaskItem () { ItemSpec = WindowsCompatibilityExtensions.NormalizeFilePath (source.Trim ()) };
 401                         if (targetType.IsArray)
 402                                 return new ArrayList (source.Split (';').Select (s => s.Trim ()).Where (s => !string.IsNullOrEmpty (s)).Select (s => ConvertTo (s, targetType.GetElementType ())).ToArray ())
 403                                                 .ToArray (targetType.GetElementType ());
 404                         if (targetType == typeof(bool)) {
 405                                 switch (source != null ? source.ToLower (CultureInfo.InvariantCulture) : string.Empty) {
 406                                 case "true":
 407                                 case "yes":
 408                                 case "on":
 409                                         return true;
 410                                 case "false":
 411                                 case "no":
 412                                 case "off":
 413                                 case "":
 414                                         return false;
 415                                 }
 416                         }
 417                         return Convert.ChangeType (source == "" ? null : source, targetType);
 418                 }
 419
 420                 string ConvertFrom (object source)
 421                 {
 422                         if (source == null)
 423                                 return string.Empty;
 424                         if (source is ITaskItem)
 425                                 return ((ITaskItem) source).ItemSpec;
 426                         if (source.GetType ().IsArray)
 427                                 return string.Join (";", ((Array) source).Cast<object> ().Select (o => ConvertFrom (o)).ToArray ());
 428                         else
 429                                 return (string) Convert.ChangeType (source, typeof (string));
 430                 }
 431
 432                 class TargetOutputTaskItem : ITaskItem2
 433                 {
 434                         Hashtable metadata = new Hashtable ();
 435
 436                         #region ITaskItem2 implementation
 437                         public string GetMetadataValueEscaped (string metadataName)
 438                         {
 439                                 return ProjectCollection.Escape ((string) metadata [metadataName]);
 440                         }
 441                         public void SetMetadataValueLiteral (string metadataName, string metadataValue)
 442                         {
 443                                 metadata [metadataName] = ProjectCollection.Unescape (metadataValue);
 444                         }
 445                         public IDictionary CloneCustomMetadataEscaped ()
 446                         {
 447                                 var ret = new Hashtable ();
 448                                 foreach (DictionaryEntry e in metadata)
 449                                         ret [e.Key] = ProjectCollection.Escape ((string) e.Value);
 450                                 return ret;
 451                         }
 452                         public string EvaluatedIncludeEscaped {
 453                                 get { return ProjectCollection.Escape (ItemSpec); }
 454                                 set { ItemSpec = ProjectCollection.Unescape (value); }
 455                         }
 456                         #endregion
 457                         #region ITaskItem implementation
 458                         public IDictionary CloneCustomMetadata ()
 459                         {
 460                                 return new Hashtable (metadata);
 461                         }
 462                         public void CopyMetadataTo (ITaskItem destinationItem)
 463                         {
 464                                 foreach (DictionaryEntry e in metadata)
 465                                         destinationItem.SetMetadata ((string) e.Key, (string) e.Value);
 466                         }
 467                         public string GetMetadata (string metadataName)
 468                         {
 469                                 var wk = ProjectCollection.GetWellKnownMetadata (metadataName, ItemSpec, Path.GetFullPath, null);
 470                                 if (wk != null)
 471                                         return wk;
 472                                 return (string) metadata [metadataName];
 473                         }
 474                         public void RemoveMetadata (string metadataName)
 475                         {
 476                                 metadata.Remove (metadataName);
 477                         }
 478                         public void SetMetadata (string metadataName, string metadataValue)
 479                         {
 480                                 metadata [metadataName] = metadataValue;
 481                         }
 482                         public string ItemSpec { get; set; }
 483                         public int MetadataCount {
 484                                 get { return metadata.Count; }
 485                         }
 486                         public ICollection MetadataNames {
 487                                 get { return metadata.Keys; }
 488                         }
 489                         #endregion
 490                 }
 491
 492 #if NET_4_5
 493                 #region IBuildEngine4 implementation
 494
 495                 // task objects are not in use anyways though...
 496
 497                 class TaskObjectRegistration
 498                 {
 499                         public TaskObjectRegistration (object key, object obj, RegisteredTaskObjectLifetime lifetime, bool allowEarlyCollection)
 500                         {
 501                                 Key = key;
 502                                 Object = obj;
 503                                 Lifetime = lifetime;
 504                                 AllowEarlyCollection = allowEarlyCollection;
 505                         }
 506                         public object Key { get; private set; }
 507                         public object Object { get; private set; }
 508                         public RegisteredTaskObjectLifetime Lifetime { get; private set; }
 509                         public bool AllowEarlyCollection { get; private set; }
 510                 }
 511
 512                 List<TaskObjectRegistration> task_objects = new List<TaskObjectRegistration> ();
 513
 514                 public object GetRegisteredTaskObject (object key, RegisteredTaskObjectLifetime lifetime)
 515                 {
 516                         var reg = task_objects.FirstOrDefault (t => t.Key == key && t.Lifetime == lifetime);
 517                         return reg != null ? reg.Object : null;
 518                 }
 519
 520                 public void RegisterTaskObject (object key, object obj, RegisteredTaskObjectLifetime lifetime, bool allowEarlyCollection)
 521                 {
 522                         task_objects.Add (new TaskObjectRegistration (key, obj, lifetime, allowEarlyCollection));
 523                 }
 524
 525                 public object UnregisterTaskObject (object key, RegisteredTaskObjectLifetime lifetime)
 526                 {
 527                         var reg = task_objects.FirstOrDefault (t => t.Key == key && t.Lifetime == lifetime);
 528                         if (reg != null)
 529                                 task_objects.Remove (reg);
 530                         return reg.Object;
 531                 }
 532                 #endregion
 533 #endif
 534
 535                 #region IBuildEngine3 implementation
 536
 537                 public BuildEngineResult BuildProjectFilesInParallel (string[] projectFileNames, string[] targetNames, IDictionary[] globalProperties, IList<string>[] removeGlobalProperties, string[] toolsVersion, bool returnTargetOutputs)
 538                 {
 539                         throw new NotImplementedException ();
 540                 }
 541
 542                 public void Reacquire ()
 543                 {
 544                         throw new NotImplementedException ();
 545                 }
 546
 547                 public void Yield ()
 548                 {
 549                         throw new NotImplementedException ();
 550                 }
 551
 552                 #endregion
 553
 554                 #region IBuildEngine2 implementation
 555
 556                 // To NOT reuse this IBuildEngine instance for different build, we create another BuildManager and BuildSubmisson and then run it.
 557                 public bool BuildProjectFile (string projectFileName, string[] targetNames, IDictionary globalProperties, IDictionary targetOutputs, string toolsVersion)
 558                 {
 559                         var globalPropertiesThatMakeSense = new Dictionary<string,string> ();
 560                         foreach (DictionaryEntry p in globalProperties)
 561                                 globalPropertiesThatMakeSense [(string) p.Key] = (string) p.Value;
 562                         var result = new BuildManager ().Build (this.submission.BuildManager.OngoingBuildParameters.Clone (), new BuildRequestData (projectFileName, globalPropertiesThatMakeSense, toolsVersion, targetNames, null));
 563                         foreach (var p in result.ResultsByTarget)
 564                                 targetOutputs [p.Key] = p.Value.Items;
 565                         return result.OverallResult == BuildResultCode.Success;
 566                 }
 567
 568                 public bool BuildProjectFilesInParallel (string[] projectFileNames, string[] targetNames, IDictionary[] globalProperties, IDictionary[] targetOutputsPerProject, string[] toolsVersion, bool useResultsCache, bool unloadProjectsOnCompletion)
 569                 {
 570                         throw new NotImplementedException ();
 571                 }
 572
 573                 public bool IsRunningMultipleNodes {
 574                         get {
 575                                 throw new NotImplementedException ();
 576                         }
 577                 }
 578
 579                 ProjectInstance GetProjectInstance (string projectFileName, string toolsVersion)
 580                 {
 581                         string fullPath = Path.GetFullPath (projectFileName);
 582                         if (submission.BuildRequest.ProjectFullPath == fullPath)
 583                                 return submission.BuildRequest.ProjectInstance;
 584                         // FIXME: could also be filtered by global properties
 585                         // http://msdn.microsoft.com/en-us/library/microsoft.build.evaluation.projectcollection.getloadedprojects.aspx
 586                         var project = Projects.GetLoadedProjects (projectFileName).FirstOrDefault (p => p.ToolsVersion == toolsVersion);
 587                         if (project == null)
 588                                 throw new InvalidOperationException (string.Format ("Project '{0}' is not loaded", projectFileName));
 589                         return submission.BuildManager.GetProjectInstanceForBuild (project);
 590                 }
 591
 592                 #endregion
 593
 594                 #region IBuildEngine implementation
 595
 596                 public bool BuildProjectFile (string projectFileName, string[] targetNames, IDictionary globalProperties, IDictionary targetOutputs)
 597                 {
 598                         return BuildProjectFile (projectFileName, targetNames, globalProperties, targetOutputs, Projects.DefaultToolsVersion);
 599                 }
 600
 601                 public void LogCustomEvent (CustomBuildEventArgs e)
 602                 {
 603                         event_source.FireCustomEventRaised (this, e);
 604                 }
 605
 606                 public void LogErrorEvent (BuildErrorEventArgs e)
 607                 {
 608                         event_source.FireErrorRaised (this, e);
 609                 }
 610
 611                 public void LogMessageEvent (BuildMessageEventArgs e)
 612                 {
 613                         event_source.FireMessageRaised (this, e);
 614                 }
 615
 616                 public void LogWarningEvent (BuildWarningEventArgs e)
 617                 {
 618                         event_source.FireWarningRaised (this, e);
 619                 }
 620
 621                 public int ColumnNumberOfTaskNode {
 622                         get { return current_task.Location != null ? current_task.Location.Column : 0; }
 623                 }
 624
 625                 public bool ContinueOnError {
 626                         get { return current_task != null && project.EvaluateCondition (current_task.Condition) && EvaluateContinueOnError (current_task.ContinueOnError); }
 627                 }
 628
 629                 bool EvaluateContinueOnError (string value)
 630                 {
 631                         switch (value) {
 632                         case "WarnAndContinue":
 633                         case "ErrorAndContinue":
 634                                 return true;
 635                         case "ErrorAndStop":
 636                                 return false;
 637                         }
 638                         // empty means "stop on error", so don't pass empty string to EvaluateCondition().
 639                         return !string.IsNullOrEmpty (value) && project.EvaluateCondition (value);
 640                 }
 641
 642                 public int LineNumberOfTaskNode {
 643                         get { return current_task.Location != null ? current_task.Location.Line : 0; }
 644                 }
 645
 646                 public string ProjectFileOfTaskNode {
 647                         get { return current_task.FullPath; }
 648                 }
 649
 650                 #endregion
 651         }
 652 }
 653