Roll Observatory deps (charted -> ^0.3.0)

packages/analyzer/tool/task_dependency_graph.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.
-
-/**
- * This file contains code to output a description of tasks and their
- * dependencies in ".dot" format.  Prior to running, the user should run "pub
- * get" in the analyzer directory to ensure that a "packages" folder exists.
- *
- * The ".dot" file is output to standard out.  To convert it to a pdf, store it
- * in a file (e.g. "tasks.dot"), and post-process it with
- * "dot tasks.dart -Tpdf -O".
- *
- * TODO(paulberry):
- * - Add general.dart and html.dart for completeness.
- * - Use Graphviz's "record" feature to produce more compact output
- *   (http://www.graphviz.org/content/node-shapes#record)
- * - Produce a warning if a result descriptor is found which isn't the output
- *   of exactly one task.
- * - Convert this tool to use package_config to find the package map.
- */
-library task_dependency_graph;
-
-import 'dart:io' hide File;
-
-import 'package:analyzer/analyzer.dart';
-import 'package:analyzer/file_system/file_system.dart';
-import 'package:analyzer/file_system/physical_file_system.dart';
-import 'package:analyzer/src/generated/element.dart';
-import 'package:analyzer/src/generated/engine.dart';
-import 'package:analyzer/src/generated/java_io.dart';
-import 'package:analyzer/src/generated/sdk.dart';
-import 'package:analyzer/src/generated/sdk_io.dart';
-import 'package:analyzer/src/generated/source.dart';
-import 'package:analyzer/src/generated/source_io.dart';
-import 'package:path/path.dart' as path;
-
-main() {
-  new Driver().run();
-}
-
-typedef void ResultDescriptorFinderCallback(PropertyAccessorElement element);
-
-class Driver {
-  PhysicalResourceProvider resourceProvider;
-  AnalysisContext context;
-  InterfaceType resultDescriptorType;
-  String rootDir;
-
-  void findResultDescriptors(
-      AstNode node, void callback(String descriptorName)) {
-    Set<PropertyAccessorElement> resultDescriptors =
-        new Set<PropertyAccessorElement>();
-    node.accept(new ResultDescriptorFinder(
-        resultDescriptorType, resultDescriptors.add));
-    for (PropertyAccessorElement resultDescriptor in resultDescriptors) {
-      callback(resultDescriptor.name);
-    }
-  }
-
-  /**
-   * Find the root directory of the analyzer package by proceeding
-   * upward to the 'tool' dir, and then going up one more directory.
-   */
-  String findRoot(String pathname) {
-    while (path.basename(pathname) != 'tool') {
-      String parent = path.dirname(pathname);
-      if (parent.length >= pathname.length) {
-        throw new Exception("Can't find root directory");
-      }
-      pathname = parent;
-    }
-    return path.dirname(pathname);
-  }
-
-  CompilationUnit getUnit(Source source) =>
-      context.resolveCompilationUnit2(source, source);
-
-  void run() {
-    rootDir = findRoot(Platform.script.toFilePath(windows: Platform.isWindows));
-    resourceProvider = PhysicalResourceProvider.INSTANCE;
-    DartSdk sdk = DirectoryBasedDartSdk.defaultSdk;
-    context = AnalysisEngine.instance.createAnalysisContext();
-    JavaFile packagesDir = new JavaFile(path.join(rootDir, 'packages'));
-    List<UriResolver> uriResolvers = [
-      new DartUriResolver(sdk),
-      new PackageUriResolver(<JavaFile>[packagesDir]),
-      new FileUriResolver()
-    ];
-    context.sourceFactory = new SourceFactory(uriResolvers);
-    Source taskSource =
-        setupSource(path.join('lib', 'src', 'task', 'dart.dart'));
-    Source modelSource = setupSource(path.join('lib', 'task', 'model.dart'));
-    CompilationUnitElement modelElement = getUnit(modelSource).element;
-    InterfaceType analysisTaskType = modelElement.getType('AnalysisTask').type;
-    DartType dynamicType = context.typeProvider.dynamicType;
-    resultDescriptorType = modelElement
-        .getType('ResultDescriptor')
-        .type
-        .substitute4([dynamicType]);
-    CompilationUnit taskUnit = getUnit(taskSource);
-    CompilationUnitElement taskUnitElement = taskUnit.element;
-    print('digraph G {');
-    Set<String> results = new Set<String>();
-    for (ClassElement cls in taskUnitElement.types) {
-      if (!cls.isAbstract && cls.type.isSubtypeOf(analysisTaskType)) {
-        String task = cls.name;
-        // TODO(paulberry): node is deprecated.  What am I supposed to do
-        // instead?
-        findResultDescriptors(cls.getMethod('buildInputs').node,
-            (String input) {
-          results.add(input);
-          print('  $input -> $task');
-        });
-        findResultDescriptors(cls.getField('DESCRIPTOR').node, (String output) {
-          results.add(output);
-          print('  $task -> $output');
-        });
-      }
-    }
-    for (String result in results) {
-      print('  $result [shape=box]');
-    }
-    print('}');
-  }
-
-  Source setupSource(String filename) {
-    String filePath = path.join(rootDir, filename);
-    File file = resourceProvider.getResource(filePath);
-    Source source = file.createSource();
-    Uri restoredUri = context.sourceFactory.restoreUri(source);
-    if (restoredUri != null) {
-      source = file.createSource(restoredUri);
-    }
-    ChangeSet changeSet = new ChangeSet();
-    changeSet.addedSource(source);
-    context.applyChanges(changeSet);
-    return source;
-  }
-}
-
-class ResultDescriptorFinder extends GeneralizingAstVisitor {
-  final InterfaceType resultDescriptorType;
-  final ResultDescriptorFinderCallback callback;
-
-  ResultDescriptorFinder(this.resultDescriptorType, this.callback);
-
-  @override
-  visitIdentifier(Identifier node) {
-    Element element = node.staticElement;
-    if (element is PropertyAccessorElement &&
-        element.isGetter &&
-        element.returnType.isSubtypeOf(resultDescriptorType)) {
-      callback(element);
-    }
-  }
-}