Roll Observatory packages and add a roll script

web_components/lib/src/mirror_initializer.dart

-// Copyright (c) 2014, 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.
-
-/// Contains logic to initialize web_components apps during development. This
-/// implementation uses dart:mirrors to load each library as they are discovered
-/// through HTML imports. This is only meant to be used during development in
-/// dartium, and the web_components transformers replace this implementation
-/// for deployment.
-library web_components.src.mirror_initializer;
-
-import 'dart:async';
-import 'dart:collection' show LinkedHashMap;
-import 'dart:mirrors';
-import 'dart:html';
-import 'package:initialize/initialize.dart' as init;
-import 'package:path/path.dart' show url;
-
-const bool deployMode = false;
-
-Future run({List<Type> typeFilter, init.InitializerFilter customFilter}) async {
-  var libraryUris =
-      _discoverLibrariesToLoad(document, window.location.href).map(Uri.parse);
-
-  for (var uri in libraryUris) {
-    await init.run(
-        typeFilter: typeFilter, customFilter: customFilter, from: uri);
-  }
-
-  _validatePackageImports(document);
-  return null;
-}
-
-/// Walks the HTML import structure to discover all script tags that are
-/// implicitly loaded. This code is only used in Dartium and should only be
-/// called after all HTML imports are resolved. Polymer ensures this by asking
-/// users to put their Dart script tags after all HTML imports (this is checked
-/// by the linter, and Dartium will otherwise show an error message).
-Iterable<_ScriptInfo> _discoverScripts(Document doc, String baseUri,
-    [_State state]) {
-  if (state == null) state = new _State();
-  if (doc == null) {
-    print('warning: $baseUri not found.');
-    return state.scripts.values;
-  }
-  if (!state.seen.add(doc)) return state.scripts.values;
-
-  for (var node in doc.querySelectorAll('script,link[rel="import"]')) {
-    if (node is LinkElement) {
-      _discoverScripts(node.import, node.href, state);
-    } else if (node is ScriptElement && node.type == 'application/dart') {
-      var info = _scriptInfoFor(node, baseUri);
-      if (state.scripts.containsKey(info.resolvedUrl)) {
-        // TODO(jakemac): Move this to a web_components uri.
-        print('warning: Script `${info.resolvedUrl}` included more than once. '
-            'See http://goo.gl/5HPeuP#polymer_44 for more details.');
-      } else {
-        state.scripts[info.resolvedUrl] = info;
-      }
-    }
-  }
-  return state.scripts.values;
-}
-
-/// Internal state used in [_discoverScripts].
-class _State {
-  /// Documents that we have visited thus far.
-  final Set<Document> seen = new Set();
-
-  /// Scripts that have been discovered, in tree order.
-  final LinkedHashMap<String, _ScriptInfo> scripts = {};
-}
-
-/// Holds information about a Dart script tag.
-class _ScriptInfo {
-  /// The original URL seen in the tag fully resolved.
-  final String resolvedUrl;
-
-  /// Whether it seems to be a 'package:' URL (starts with the package-root).
-  bool get isPackage => packageUrl != null;
-
-  /// The equivalent 'package:' URL, if any.
-  final String packageUrl;
-
-  _ScriptInfo(this.resolvedUrl, {this.packageUrl});
-}
-
-// TODO(sigmund): explore other (cheaper) ways to resolve URIs relative to the
-// root library (see dartbug.com/12612)
-final _rootUri = currentMirrorSystem().isolate.rootLibrary.uri;
-
-/// Returns [_ScriptInfo] for [script] which was seen in [baseUri].
-_ScriptInfo _scriptInfoFor(script, baseUri) {
-  var uriString = script.src;
-  if (uriString != '') {
-    var uri = _rootUri.resolve(uriString);
-    if (!_isHttpStylePackageUrl(uri)) return new _ScriptInfo('$uri');
-    // Use package: urls if available. This rule here is more permissive than
-    // how we translate urls in polymer-build, but we expect Dartium to limit
-    // the cases where there are differences. The polymer-build issues an error
-    // when using packages/ inside lib without properly stepping out all the way
-    // to the packages folder. If users don't create symlinks in the source
-    // tree, then Dartium will also complain because it won't find the file seen
-    // in an HTML import.
-    var packagePath = uri.path
-        .substring(uri.path.lastIndexOf('packages/') + 'packages/'.length);
-    return new _ScriptInfo('$uri', packageUrl: 'package:$packagePath');
-  }
-
-  // Even in the case of inline scripts its ok to just use the baseUri since
-  // there can only be one per page.
-  return new _ScriptInfo(baseUri);
-}
-
-/// Whether [uri] is an http URI that contains a 'packages' segment, and
-/// therefore could be converted into a 'package:' URI.
-bool _isHttpStylePackageUrl(Uri uri) {
-  var uriPath = uri.path;
-  return uri.scheme == _rootUri.scheme &&
-      // Don't process cross-domain uris.
-      uri.authority == _rootUri.authority &&
-      uriPath.endsWith('.dart') &&
-      (uriPath.contains('/packages/') || uriPath.startsWith('packages/'));
-}
-
-Iterable<String> _discoverLibrariesToLoad(Document doc, String baseUri) =>
-    _discoverScripts(doc, baseUri).map(
-        (info) => _packageUrlExists(info) ? info.packageUrl : info.resolvedUrl);
-
-/// All libraries in the current isolate.
-final _libs = currentMirrorSystem().libraries;
-
-bool _packageUrlExists(_ScriptInfo info) =>
-    info.isPackage && _libs[Uri.parse(info.packageUrl)] != null;
-
-/// All the imports that we have checked for package path validation.
-final _importsSeen = new Set<LinkElement>();
-
-/// All the documents that we have crawled for import validation.
-final _documentsSeen = new Set<Document>();
-
-/// Validates that all html imports to packages urls point to the right packages
-/// symlink (the one next to the entry point).
-void _validatePackageImports(Document doc) {
-  var imports = doc.querySelectorAll('link[rel="import"]');
-  for (LinkElement import in imports) {
-    // Don't re-validate imports.
-    if (!_importsSeen.add(import)) continue;
-
-    // Check that the href points to the right packages path. If it doesn't we
-    // don't continue checking as it will print extraneous errors.
-    if (import.href.contains('packages/') && !_checkPackagePath(import)) {
-      continue;
-    }
-
-    // Validate any imports contained in this import, if the document hasn't yet
-    // been seen.
-    var importDoc = import.import;
-    if (importDoc == null || !_documentsSeen.add(importDoc)) continue;
-    _validatePackageImports(importDoc);
-  }
-}
-
-/// The path to the entry document.
-final entryPath = document.baseUri;
-
-/// Checks that the relative path from the entry point to all packages imports
-/// starts with `packages/`.
-bool _checkPackagePath(LinkElement import) {
-  var dirname = entryPath.endsWith('/') ? entryPath : url.dirname(entryPath);
-  var pathFromEntryPoint = url.relative(import.href, from: dirname);
-  if (pathFromEntryPoint.startsWith('packages/')) return true;
-
-  LinkElement correctedImport = import.clone(false);
-
-  var relativeUriParts = url.split(
-      url.relative(import.ownerDocument.baseUri, from: url.dirname(entryPath)));
-  var pathToEntryPoint = '../' * (relativeUriParts.length - 1);
-  var packagePath = import.href.substring(import.href.indexOf('packages/'));
-  correctedImport.href = '$pathToEntryPoint$packagePath';
-
-  // TODO(jakemac): Throw an exception here at the next breaking change, and add
-  // a test at that point (no easy way to test console.error).
-  window.console.error('''
-Found bad packages uri in html import. All packages uris should point to the
-packages symlink in the same folder as the entry point.
-
-Entry point: $entryPath
-Owner document: ${import.ownerDocument.baseUri}
-Current import: ${import.outerHtml}
-Corrected import: ${correctedImport.outerHtml}
-
-For more information, please see:
-https://www.dartlang.org/polymer/app-directories.html#into-a-non-dart-non-entry-point
-''');
-  return false;
-}