Add an extension point for contributing to HTML_ERRORS.

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

 // 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
@@ skipping 10 matching lines @@
   /**
    * 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;
@@ skipping 11 matching lines @@
       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, _validateResultDescriptor);
+        DART_ERRORS_FOR_SOURCE_EXTENSION_POINT,
+        _validateAnalysisErrorListResultDescriptor);
     dartErrorsForUnitExtensionPoint = registerExtensionPoint(
-        DART_ERRORS_FOR_UNIT_EXTENSION_POINT, _validateResultDescriptor);
+        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, BUILD_DIRECTIVES_ERRORS);
     registerExtension(id, BUILD_LIBRARY_ERRORS);
     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);
@@ skipping 41 matching lines @@
       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 [ResultDescriptor].
+   * a [ListResultDescriptor] of [AnalysisError]s.
    */
-  void _validateResultDescriptor(Object extension) {
-    if (extension is! ResultDescriptor) {
+  void _validateAnalysisErrorListResultDescriptor(Object extension) {
+    if (extension is! ListResultDescriptor<AnalysisError>) {
       String id = taskExtensionPoint.uniqueIdentifier;
-      throw new ExtensionError('Extensions to $id must be a ResultDescriptor');
+      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');
     }
   }
 }