Compute TYPE_PROVIDER using BuildTypeProviderTask.

pkg/analyzer/lib/task/model.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.task.model;
 
 import 'dart:collection';
 
 import 'package:analyzer/src/generated/engine.dart' hide AnalysisTask;
 import 'package:analyzer/src/generated/java_engine.dart';
 import 'package:analyzer/src/generated/source.dart';
 import 'package:analyzer/src/task/model.dart';
 
 /**
  * A function that takes an analysis [context] and an analysis [target] and
  * returns an analysis task. Such functions are passed to a [TaskDescriptor] to
  * be used to create the described task.
  */
 typedef AnalysisTask BuildTask(AnalysisContext context, AnalysisTarget target);
 
 /**
  * A function that takes the target for which a task will produce results and
  * returns a map from input names to descriptions of the analysis results needed
  * by the task in order for the task to be performed. Such functions are passed
  * to a [TaskDescriptor] to be used to determine the inputs needed by the task.
  */
 typedef Map<String, TaskInput> CreateTaskInputs(AnalysisTarget target);
 
 /**
+ * An [AnalysisTarget] wrapper for an [AnalysisContext].
+ */
+class AnalysisContextTarget implements AnalysisTarget {
+  static final AnalysisContextTarget request = new AnalysisContextTarget(null);
+
+  final AnalysisContext context;
+
+  AnalysisContextTarget(this.context);
+
+  @override
+  Source get source => null;
+}
+
+/**
  * An object with which an analysis result can be associated.
  *
  * Clients are allowed to subtype this class when creating new kinds of targets.
  * Instances of this type are used in hashed data structures, so subtypes are
  * required to correctly implement [==] and [hashCode].
  */
 abstract class AnalysisTarget {
   /**
    * Return the source associated with this target, or `null` if this target is
    * not associated with a source.
@@ skipping 319 matching lines @@
    * be computed, or `false` if the inputs have been computed.
    *
    * It is safe to invoke [moveNext] after it has returned `false`. In this case
    * [moveNext] has no effect and will again return `false`.
    *
    * Throws a [StateError] if the value of the current result has not been
    * provided using [currentValue].
    */
   bool moveNext();
 }