Roll Observatory packages and add a roll script

web_components/lib/build/import_crawler.dart

Index: web_components/lib/build/import_crawler.dart
diff --git a/web_components/lib/build/import_crawler.dart b/web_components/lib/build/import_crawler.dart
deleted file mode 100644
index 0053a18d40b5ce2d61a4cb8115d48d1faeb55ca0..0000000000000000000000000000000000000000
--- a/web_components/lib/build/import_crawler.dart
+++ /dev/null
@@ -1,90 +0,0 @@
-// Copyright (c) 2013, 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 web_components.build.import_crawler;
-
-import 'dart:async';
-import 'dart:collection' show LinkedHashMap;
-import 'package:code_transformers/assets.dart';
-import 'package:code_transformers/messages/build_logger.dart';
-import 'package:barback/barback.dart';
-import 'package:html/dom.dart' show Document, Element;
-import 'common.dart';
-import 'messages.dart';
-
-/// Information about an html import found in a document.
-class ImportData {
-  /// The [AssetId] where the html import appeared.
-  final AssetId fromId;
-
-  /// The [Document] where the html import appeared.
-  final Document document;
-
-  /// The html import element itself.
-  final Element element;
-
-  ImportData(this.document, this.element, {this.fromId});
-}
-
-/// A crawler for html imports.
-class ImportCrawler {
-  // Can be either an AggregateTransform or Transform.
-  final _transform;
-  final BuildLogger _logger;
-  final AssetId _primaryInputId;
-
-  // Optional parsed document for the primary id if available.
-  final Document _primaryDocument;
-
-  ImportCrawler(this._transform, this._primaryInputId, this._logger,
-      {Document primaryDocument})
-      : _primaryDocument = primaryDocument;
-
-  /// Returns a post-ordered map of [AssetId]'s to [ImportData]. The [AssetId]'s
-  /// represent an asset which was discovered via an html import, and the
-  /// [ImportData] represents the [Document] where it was discovered and the
-  /// html import [Element] itself.
-  Future<LinkedHashMap<AssetId, ImportData>> crawlImports() {
-    var documents = new LinkedHashMap<AssetId, ImportData>();
-    var seen = new Set<AssetId>();
-
-    Future doCrawl(AssetId assetId,
-        {Element import, Document document, AssetId from}) {
-      if (seen.contains(assetId)) return null;
-      seen.add(assetId);
-
-      Future crawlImports(Document document) {
-        var imports = document
-            .querySelectorAll('link[rel="import"]')
-            .where((import) => import.attributes['type'] != 'css');
-        var done = Future.forEach(imports,
-            (i) => doCrawl(_importId(assetId, i), import: i, from: assetId));
-
-        // Add this document after its dependencies.
-        return done.then((_) {
-          documents[assetId] = new ImportData(document, import, fromId: from);
-        });
-      }
-
-      if (document != null) {
-        return crawlImports(document);
-      } else {
-        return _transform.readInputAsString(assetId).then((html) {
-          return crawlImports(parseHtml(html, assetId.path));
-        }).catchError((error) {
-          var span;
-          if (import != null) span = import.sourceSpan;
-          _logger.error(inlineImportFail.create({'error': error}), span: span);
-        });
-      }
-    }
-
-    return doCrawl(_primaryInputId, document: _primaryDocument)
-        .then((_) => documents);
-  }
-
-  AssetId _importId(AssetId source, Element import) {
-    var url = import.attributes['href'];
-    return uriToAssetId(source, url, _transform.logger, import.sourceSpan);
-  }
-}