Roll Observatory packages and add a roll script

analyzer/lib/src/task/general.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.task.general;
-
-import 'package:analyzer/src/generated/engine.dart' hide AnalysisTask;
-import 'package:analyzer/src/generated/source.dart';
-import 'package:analyzer/task/general.dart';
-import 'package:analyzer/task/model.dart';
-
-/**
- * A task that gets the contents of the source associated with an analysis
- * target.
- */
-class GetContentTask extends SourceBasedAnalysisTask {
-  /**
-   * The task descriptor describing this kind of task.
-   */
-  static final TaskDescriptor DESCRIPTOR = new TaskDescriptor('GetContentTask',
-      createTask, buildInputs, <ResultDescriptor>[CONTENT, MODIFICATION_TIME]);
-
-  /**
-   * Initialize a newly created task to access the content of the source
-   * associated with the given [target] in the given [context].
-   */
-  GetContentTask(AnalysisContext context, AnalysisTarget target)
-      : super(context, target);
-
-  @override
-  TaskDescriptor get descriptor => DESCRIPTOR;
-
-  @override
-  internalPerform() {
-    Source source = getRequiredSource();
-    try {
-      TimestampedData<String> data = context.getContents(source);
-      outputs[CONTENT] = data.data;
-      outputs[MODIFICATION_TIME] = data.modificationTime;
-    } catch (exception) {
-      outputs[CONTENT] = '';
-      outputs[MODIFICATION_TIME] = -1;
-    }
-  }
-
-  /**
-   * Return a map from the names of the inputs of this kind of task to the task
-   * input descriptors describing those inputs for a task with the given [target].
-   */
-  static Map<String, TaskInput> buildInputs(AnalysisTarget target) {
-    return <String, TaskInput>{};
-  }
-
-  /**
-   * Create a [GetContentTask] based on the given [target] in the given
-   * [context].
-   */
-  static GetContentTask createTask(
-      AnalysisContext context, AnalysisTarget target) {
-    return new GetContentTask(context, target);
-  }
-}
-
-/**
- * A base class for analysis tasks whose target is expected to be a source.
- */
-abstract class SourceBasedAnalysisTask extends AnalysisTask {
-  /**
-   * Initialize a newly created task to perform analysis within the given
-   * [context] in order to produce results for the given [target].
-   */
-  SourceBasedAnalysisTask(AnalysisContext context, AnalysisTarget target)
-      : super(context, target);
-
-  @override
-  String get description {
-    Source source = target.source;
-    String sourceName = source == null ? '<unknown source>' : source.fullName;
-    return '${descriptor.name} for source $sourceName';
-  }
-}