Roll Observatory packages and add a roll script

packages/analyzer/lib/src/plugin/engine_plugin.dart

Index: packages/analyzer/lib/src/plugin/engine_plugin.dart
diff --git a/packages/analyzer/lib/src/plugin/engine_plugin.dart b/packages/analyzer/lib/src/plugin/engine_plugin.dart
new file mode 100644
index 0000000000000000000000000000000000000000..6573b0aab6d29093e0e2a4ba2ca596f02a11d009
--- /dev/null
+++ b/packages/analyzer/lib/src/plugin/engine_plugin.dart
@@ -0,0 +1,272 @@
+// Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+library analyzer.src.plugin.engine_plugin;
+
+import 'package:analyzer/plugin/task.dart';
+import 'package:analyzer/src/generated/engine.dart'
+    show InternalAnalysisContext;
+import 'package:analyzer/src/generated/error.dart' show AnalysisError;
+import 'package:analyzer/src/task/dart.dart';
+import 'package:analyzer/src/task/dart_work_manager.dart';
+import 'package:analyzer/src/task/general.dart';
+import 'package:analyzer/src/task/html.dart';
+import 'package:analyzer/src/task/html_work_manager.dart';
+import 'package:analyzer/task/model.dart';
+import 'package:plugin/plugin.dart';
+
+/**
+ * A plugin that defines the extension points and extensions that are inherently
+ * defined by the analysis engine.
+ */
+class EnginePlugin implements Plugin {
+  /**
+   * The simple identifier of the extension point that allows plugins to
+   * register new analysis error results to compute for a Dart source.
+   */
+  static const String DART_ERRORS_FOR_SOURCE_EXTENSION_POINT =
+      'dartErrorsForSource';
+
+  /**
+   * The simple identifier of the extension point that allows plugins to
+   * register new analysis error results to compute for a Dart library
+   * specific unit.
+   */
+  static const String DART_ERRORS_FOR_UNIT_EXTENSION_POINT =
+      'dartErrorsForUnit';
+
+  /**
+   * The simple identifier of the extension point that allows plugins to
+   * register new analysis error results to compute for an HTML source.
+   */
+  static const String HTML_ERRORS_EXTENSION_POINT = 'htmlErrors';
+
+  /**
+   * The simple identifier of the extension point that allows plugins to
+   * register new analysis tasks with the analysis engine.
+   */
+  static const String TASK_EXTENSION_POINT = 'task';
+
+  /**
+   * The simple identifier of the extension point that allows plugins to
+   * register new work manager factories with the analysis engine.
+   */
+  static const String WORK_MANAGER_FACTORY_EXTENSION_POINT =
+      'workManagerFactory';
+
+  /**
+   * The unique identifier of this plugin.
+   */
+  static const String UNIQUE_IDENTIFIER = 'analysis_engine.core';
+
+  /**
+   * The extension point that allows plugins to register new analysis error
+   * results for a Dart source.
+   */
+  ExtensionPoint dartErrorsForSourceExtensionPoint;
+
+  /**
+   * The extension point that allows plugins to register new analysis error
+   * results for a Dart library specific unit.
+   */
+  ExtensionPoint dartErrorsForUnitExtensionPoint;
+
+  /**
+   * The extension point that allows plugins to register new analysis error
+   * results for an HTML source.
+   */
+  ExtensionPoint htmlErrorsExtensionPoint;
+
+  /**
+   * The extension point that allows plugins to register new analysis tasks with
+   * the analysis engine.
+   */
+  ExtensionPoint taskExtensionPoint;
+
+  /**
+   * The extension point that allows plugins to register new work manager
+   * factories with the analysis engine.
+   */
+  ExtensionPoint workManagerFactoryExtensionPoint;
+
+  /**
+   * Initialize a newly created plugin.
+   */
+  EnginePlugin();
+
+  /**
+   * Return a list containing all of the contributed analysis error result
+   * descriptors for Dart sources.
+   */
+  List<TaskDescriptor> get dartErrorsForSource =>
+      dartErrorsForSourceExtensionPoint.extensions;
+
+  /**
+   * Return a list containing all of the contributed analysis error result
+   * descriptors for Dart library specific units.
+   */
+  List<TaskDescriptor> get dartErrorsForUnit =>
+      dartErrorsForUnitExtensionPoint.extensions;
+
+  /**
+   * Return a list containing all of the contributed analysis error result
+   * descriptors for HTML sources.
+   */
+  List<TaskDescriptor> get htmlErrors => htmlErrorsExtensionPoint.extensions;
+
+  /**
+   * Return a list containing all of the task descriptors that were contributed.
+   */
+  List<TaskDescriptor> get taskDescriptors => taskExtensionPoint.extensions;
+
+  @override
+  String get uniqueIdentifier => UNIQUE_IDENTIFIER;
+
+  /**
+   * Return a list containing all of the work manager factories that were
+   * contributed.
+   */
+  List<WorkManagerFactory> get workManagerFactories =>
+      workManagerFactoryExtensionPoint.extensions;
+
+  @override
+  void registerExtensionPoints(RegisterExtensionPoint registerExtensionPoint) {
+    dartErrorsForSourceExtensionPoint = registerExtensionPoint(
+        DART_ERRORS_FOR_SOURCE_EXTENSION_POINT,
+        _validateAnalysisErrorListResultDescriptor);
+    dartErrorsForUnitExtensionPoint = registerExtensionPoint(
+        DART_ERRORS_FOR_UNIT_EXTENSION_POINT,
+        _validateAnalysisErrorListResultDescriptor);
+    htmlErrorsExtensionPoint = registerExtensionPoint(
+        HTML_ERRORS_EXTENSION_POINT,
+        _validateAnalysisErrorListResultDescriptor);
+    taskExtensionPoint =
+        registerExtensionPoint(TASK_EXTENSION_POINT, _validateTaskExtension);
+    workManagerFactoryExtensionPoint = registerExtensionPoint(
+        WORK_MANAGER_FACTORY_EXTENSION_POINT,
+        _validateWorkManagerFactoryExtension);
+  }
+
+  @override
+  void registerExtensions(RegisterExtension registerExtension) {
+    _registerTaskExtensions(registerExtension);
+    _registerWorkManagerFactoryExtensions(registerExtension);
+    _registerDartErrorsForSource(registerExtension);
+    _registerDartErrorsForUnit(registerExtension);
+    _registerHtmlErrors(registerExtension);
+  }
+
+  void _registerDartErrorsForSource(RegisterExtension registerExtension) {
+    String id = DART_ERRORS_FOR_SOURCE_EXTENSION_POINT_ID;
+    registerExtension(id, PARSE_ERRORS);
+    registerExtension(id, SCAN_ERRORS);
+  }
+
+  void _registerDartErrorsForUnit(RegisterExtension registerExtension) {
+    String id = DART_ERRORS_FOR_UNIT_EXTENSION_POINT_ID;
+    registerExtension(id, LIBRARY_UNIT_ERRORS);
+  }
+
+  void _registerHtmlErrors(RegisterExtension registerExtension) {
+    String id = HTML_ERRORS_EXTENSION_POINT_ID;
+    registerExtension(id, HTML_DOCUMENT_ERRORS);
+  }
+
+  void _registerTaskExtensions(RegisterExtension registerExtension) {
+    String taskId = TASK_EXTENSION_POINT_ID;
+    //
+    // Register general tasks.
+    //
+    registerExtension(taskId, GetContentTask.DESCRIPTOR);
+    //
+    // Register Dart tasks.
+    //
+    registerExtension(taskId, BuildCompilationUnitElementTask.DESCRIPTOR);
+    registerExtension(taskId, BuildDirectiveElementsTask.DESCRIPTOR);
+    registerExtension(taskId, BuildEnumMemberElementsTask.DESCRIPTOR);
+    registerExtension(taskId, BuildExportNamespaceTask.DESCRIPTOR);
+    registerExtension(taskId, BuildLibraryElementTask.DESCRIPTOR);
+    registerExtension(taskId, BuildPublicNamespaceTask.DESCRIPTOR);
+    registerExtension(taskId, BuildSourceExportClosureTask.DESCRIPTOR);
+    registerExtension(taskId, BuildSourceImportExportClosureTask.DESCRIPTOR);
+    registerExtension(taskId, BuildTypeProviderTask.DESCRIPTOR);
+    registerExtension(taskId, ComputeConstantDependenciesTask.DESCRIPTOR);
+    registerExtension(taskId, ComputeConstantValueTask.DESCRIPTOR);
+    registerExtension(
+        taskId, ComputeInferableStaticVariableDependenciesTask.DESCRIPTOR);
+    registerExtension(taskId, ComputeLibraryCycleTask.DESCRIPTOR);
+    registerExtension(taskId, ContainingLibrariesTask.DESCRIPTOR);
+    registerExtension(taskId, DartErrorsTask.DESCRIPTOR);
+    registerExtension(taskId, EvaluateUnitConstantsTask.DESCRIPTOR);
+    registerExtension(taskId, GatherUsedImportedElementsTask.DESCRIPTOR);
+    registerExtension(taskId, GatherUsedLocalElementsTask.DESCRIPTOR);
+    registerExtension(taskId, GenerateHintsTask.DESCRIPTOR);
+    registerExtension(taskId, GenerateLintsTask.DESCRIPTOR);
+    registerExtension(taskId, InferInstanceMembersInUnitTask.DESCRIPTOR);
+    registerExtension(taskId, InferStaticVariableTypesInUnitTask.DESCRIPTOR);
+    registerExtension(taskId, InferStaticVariableTypeTask.DESCRIPTOR);
+    registerExtension(taskId, LibraryErrorsReadyTask.DESCRIPTOR);
+    registerExtension(taskId, LibraryUnitErrorsTask.DESCRIPTOR);
+    registerExtension(taskId, ParseDartTask.DESCRIPTOR);
+    registerExtension(taskId, PartiallyResolveUnitReferencesTask.DESCRIPTOR);
+    registerExtension(taskId, ResolveInstanceFieldsInUnitTask.DESCRIPTOR);
+    registerExtension(taskId, ResolveLibraryReferencesTask.DESCRIPTOR);
+    registerExtension(taskId, ResolveLibraryTypeNamesTask.DESCRIPTOR);
+    registerExtension(taskId, ResolveUnitTask.DESCRIPTOR);
+    registerExtension(taskId, ResolveUnitTypeNamesTask.DESCRIPTOR);
+    registerExtension(taskId, ResolveVariableReferencesTask.DESCRIPTOR);
+    registerExtension(taskId, ScanDartTask.DESCRIPTOR);
+    registerExtension(taskId, VerifyUnitTask.DESCRIPTOR);
+    //
+    // Register HTML tasks.
+    //
+    registerExtension(taskId, DartScriptsTask.DESCRIPTOR);
+    registerExtension(taskId, HtmlErrorsTask.DESCRIPTOR);
+    registerExtension(taskId, ParseHtmlTask.DESCRIPTOR);
+  }
+
+  void _registerWorkManagerFactoryExtensions(
+      RegisterExtension registerExtension) {
+    String taskId = WORK_MANAGER_EXTENSION_POINT_ID;
+    registerExtension(taskId,
+        (InternalAnalysisContext context) => new DartWorkManager(context));
+    registerExtension(taskId,
+        (InternalAnalysisContext context) => new HtmlWorkManager(context));
+  }
+
+  /**
+   * Validate the given extension by throwing an [ExtensionError] if it is not
+   * a [ListResultDescriptor] of [AnalysisError]s.
+   */
+  void _validateAnalysisErrorListResultDescriptor(Object extension) {
+    if (extension is! ListResultDescriptor<AnalysisError>) {
+      String id = taskExtensionPoint.uniqueIdentifier;
+      throw new ExtensionError(
+          'Extensions to $id must be a ListResultDescriptor<AnalysisError>');
+    }
+  }
+
+  /**
+   * Validate the given extension by throwing an [ExtensionError] if it is not
+   * a [TaskDescriptor].
+   */
+  void _validateTaskExtension(Object extension) {
+    if (extension is! TaskDescriptor) {
+      String id = taskExtensionPoint.uniqueIdentifier;
+      throw new ExtensionError('Extensions to $id must be a TaskDescriptor');
+    }
+  }
+
+  /**
+   * Validate the given extension by throwing an [ExtensionError] if it is not
+   * a [WorkManagerFactory].
+   */
+  void _validateWorkManagerFactoryExtension(Object extension) {
+    if (extension is! WorkManagerFactory) {
+      String id = taskExtensionPoint.uniqueIdentifier;
+      throw new ExtensionError(
+          'Extensions to $id must be a WorkManagerFactory');
+    }
+  }
+}