Roll Observatory packages and add a roll script

web_components/lib/build/test_compatibility.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.
-
-/// Some Transformers to maintain compatibility with the new `test` package,
-/// since it doesn't use normal dart script tags in html. We get around this by
-/// using two transformers:
-///   - A transformer to convert <lint rel="x-dart-test"> intro dart script tags
-///     so that they can be processed by the rest of the transformers normally.
-///   - A second transformer to convert the output back, so that the `test`
-///     package can find a <link rel="x-dart-test"> tag after all the
-///     transformations are done.
-library web_components.build.test_compatability.dart;
-
-import 'dart:async';
-import 'package:barback/barback.dart';
-import 'package:html/dom.dart';
-import 'package:html/parser.dart';
-
-/// The name of the attribute that will be added to script tags that started out
-/// as <link rel="x-dart-test"> tags.
-const testAttribute = '_was_test';
-
-/// The first transformer that should be ran, this does a query selector for
-/// link[rel="x-dart-test"] and changes them to a normal dart script tag with a
-/// special `_was_test` attribute so we know to change it back later on.
-class RewriteXDartTestToScript extends _EntryPointOnlyTransformer {
-  RewriteXDartTestToScript(List<String> entryPoints) : super(entryPoints);
-
-  Future apply(Transform transform) {
-    return transform.primaryInput.readAsString().then((String html) {
-      var doc = parse(html);
-      for (var tag in doc.querySelectorAll('link[rel="x-dart-test"]')) {
-        tag.replaceWith(new Element.tag('script')
-          ..attributes['type'] = 'application/dart'
-          ..attributes['src'] = tag.attributes['href']
-          ..attributes[testAttribute] = '');
-      }
-      transform.addOutput(
-          new Asset.fromString(transform.primaryInput.id, doc.outerHtml));
-    });
-  }
-}
-
-/// The last transformer that should be ran, this does a query selector for
-/// `script[type="application/dart"][_was_test]` and changes matching elements
-/// back to `<link rel="x-dart-test">` tags.
-class RewriteScriptToXDartTest extends _EntryPointOnlyTransformer {
-  RewriteScriptToXDartTest(List<String> entryPoints) : super(entryPoints);
-
-  Future apply(Transform transform) {
-    return transform.primaryInput.readAsString().then((String html) {
-      var doc = parse(html);
-      var scripts = doc
-          .querySelectorAll('script[type="application/dart"][$testAttribute]');
-      for (var tag in scripts) {
-        tag.replaceWith(new Element.tag('link')
-          ..attributes['rel'] = 'x-dart-test'
-          ..attributes['href'] = tag.attributes['src']);
-      }
-      transform.addOutput(
-          new Asset.fromString(transform.primaryInput.id, doc.outerHtml));
-    });
-  }
-}
-
-/// Internal base class to encapsulate the isPrimary logic.
-abstract class _EntryPointOnlyTransformer extends Transformer {
-  final List<String> entryPoints;
-
-  _EntryPointOnlyTransformer(this.entryPoints) : super();
-
-  bool isPrimary(AssetId id) {
-    if (!id.path.startsWith('test/')) return false;
-    if (entryPoints != null) return entryPoints.contains(id.path);
-    // If no entry point is supplied, then any html file is an entry point.
-    return id.path.endsWith('.html');
-  }
-}