Introduce boot.js: this finally makes it possible to load and run Todomvc

lib/polymer.dart

 // Copyright (c) 2012, 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 library exports all of the commonly used functions and types for
  * building UI's.
  *
  * See this article for more information:
  * <http://www.dartlang.org/articles/dart-web-components/>.
  */
 library polymer;
 
+import 'dart:async';
+import 'dart:mirrors';

[Jennifer Messerly, 2013/07/27 02:18:44]

show currentMirrorSystem?

[Siggi Cherem (dart-lang), 2013/07/30 00:10:29]

Done.

+
+import "package:mdv/mdv.dart" as mdv;
+import 'package:observe/observe.dart' show Observable;
+
 export 'custom_element.dart';
 export 'event.dart';
 export 'observe.dart';

[Jennifer Messerly, 2013/07/27 02:18:44]

also re-export 'package:observe/observe.dart"?

[Siggi Cherem (dart-lang), 2013/07/30 00:10:29]

Done.

 export 'observe_html.dart';
 export 'polymer_element.dart';
 export 'safe_html.dart';
 export 'scoped_css.dart';
+
+
+
+/** All libraries in the current isolate. */
+var _libs = currentMirrorSystem().libraries;
+
+/** Runs the _init method of the library at [uri]. */
+void _runInitOf(String uri) {
+  try { 
+    var lib = _libs[Uri.parse(uri)];
+    lib.invoke(const Symbol("_init"), const []);

[Jennifer Messerly, 2013/07/27 02:18:44]

lookup "_init" symbol rather than try+catch?

should be able to use
http://api.dartlang.org/docs/bleeding_edge/dart_mirrors/LibraryMirror.html#fu...

for instance properties try+catch is required because of noSuchMethod, but
fortunately, libraries can't implement NSM :)

[Siggi Cherem (dart-lang), 2013/07/30 00:10:29]

Done. Then found out that "_init" gives me errors when compiling with dart2js
(even though this code is unreachable in that case). Nevertheless, this
motivated me to implement the @CustomTag annotation.

+  } catch(e) { }
+}
+
+/**
+ * Initializes a polymer application by: setting up polling for observable
+ * changes, initializing MDV, running the `_init` method on each
+ * library in [elementLibraries] and then invoking [userMain].
+ */
+initializePolymer(List<String> elementLibraries, Function userMain) {

[Jennifer Messerly, 2013/07/27 02:18:44]

initPolymer?

[Jennifer Messerly, 2013/07/27 02:18:44]

"void userMain()" ?

[Siggi Cherem (dart-lang), 2013/07/30 00:10:29]

Done.

[Siggi Cherem (dart-lang), 2013/07/30 00:10:29]

Done.

+  new Timer.periodic(new Duration(milliseconds: 60),

[Jennifer Messerly, 2013/07/27 02:18:44]

it's arbitrary either way, but consider using 125ms like polymer?

https://github.com/Polymer/platform/blob/master/src/patches-mdv.js#L26

[Siggi Cherem (dart-lang), 2013/07/30 00:10:29]

Done.

+      (_) => Observable.dirtyCheck());
+  mdv.initialize();

[Jennifer Messerly, 2013/07/27 02:18:44]

TODO(jmesserly): mdv should use initializeMdv instead of mdv.initialize

[Siggi Cherem (dart-lang), 2013/07/30 00:10:29]

Done.

+  for (var lib in elementLibraries) {
+    _runInitOf(lib);
+  }
+  userMain();
+}