Roll Observatory packages and add a roll script

web_components/lib/build/web_components.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.
-
-/// Transformer used for pub serve and pub build
-library web_components.build.web_components;
-
-import 'dart:async';
-import 'package:barback/barback.dart';
-import 'package:code_transformers/assets.dart';
-import 'package:code_transformers/messages/build_logger.dart';
-import 'package:code_transformers/resolver.dart';
-import 'package:code_transformers/src/dart_sdk.dart' as dart_sdk;
-import 'package:html/dom.dart' as dom;
-import 'package:initialize/transformer.dart' show generateBootstrapFile;
-import 'package:initialize/build/initializer_plugin.dart';
-import 'package:path/path.dart' as path;
-import 'package:web_components/transformer.dart';
-import 'common.dart';
-
-/// Public method that can be used inside any [Transformer] which already has a
-/// [Resolver] and [Transform] to generate a bootstrap file for the
-/// web_components package.
-Asset generateWebComponentsBootstrap(Resolver resolver, Transform transform,
-    dom.Document document, AssetId scriptId, AssetId newScriptId,
-    {List<InitializerPlugin> extraPlugins: const []}) {
-  var htmlImportRecorder = new HtmlImportAnnotationRecorder();
-  var plugins = [htmlImportRecorder]..addAll(extraPlugins);
-
-  // Bootstrap the application using the `initialize` package and our
-  // plugins.
-  var initializeBootstrap = generateBootstrapFile(
-      resolver, transform, scriptId, newScriptId,
-      errorIfNotFound: false, plugins: plugins);
-
-  // Add all seen imports to the document, before the first dart script tag if
-  // it exists.
-  var dartScript =
-      document.head.querySelector('script[type="application/dart"]');
-  for (var importPath in htmlImportRecorder.importPaths) {
-    var import = new dom.Element.tag('link')
-      ..attributes = {'rel': 'import', 'href': importPath,};
-    document.head.insertBefore(import, dartScript);
-  }
-
-  return initializeBootstrap;
-}
-
-/// A [Transformer] which runs the `initialize` transformer with
-/// some special plugins and also inlines the html imports.
-class WebComponentsTransformer extends Transformer {
-  final Resolvers _resolvers;
-  TransformOptions options;
-
-  WebComponentsTransformer(this.options)
-      : _resolvers = new Resolvers.fromMock(dart_sdk.mockSdkSources);
-
-  bool isPrimary(AssetId id) {
-    if (options.entryPoints != null) {
-      return options.entryPoints.contains(id.path);
-    }
-    if (id.path == 'web/index.bootstrap.dart') return true;
-    // If no entry point is supplied, then any html file under web/ or test/ is
-    // an entry point.
-    return (id.path.startsWith('web/') || id.path.startsWith('test/')) &&
-        id.path.endsWith('.html');
-  }
-
-  Future apply(Transform transform) {
-    var logger = new BuildLogger(transform);
-    var primaryInput = transform.primaryInput;
-    return primaryInput.readAsString().then((html) {
-      // Find the dart script in the page.
-      var doc = parseHtml(html, primaryInput.id.path);
-      var mainScriptTag = doc.querySelector('script[type="$dartType"]');
-      var scriptId = uriToAssetId(primaryInput.id,
-          mainScriptTag.attributes['src'], logger, mainScriptTag.sourceSpan);
-
-      return _resolvers.get(transform, [scriptId]).then((resolver) {
-        var newScriptId = new AssetId(scriptId.package,
-            '${path.url.withoutExtension(scriptId.path)}.initialize.dart');
-
-        var bootstrap = generateWebComponentsBootstrap(
-            resolver, transform, doc, scriptId, newScriptId);
-
-        // Swap out the main script tag for the bootstrap version.
-        mainScriptTag.attributes['src'] = path.url.relative(bootstrap.id.path,
-            from: path.url.dirname(primaryInput.id.path));
-
-        // Output the new document and bootstrap file.
-        transform
-            .addOutput(new Asset.fromString(primaryInput.id, doc.outerHtml));
-        transform.addOutput(bootstrap);
-      });
-    });
-  }
-}