port TemplateBinding to ed3266266e751b5ab1f75f8e0509d0d5f0ef35d8

pkg/template_binding/lib/template_binding.dart

 // 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.
 
 /**
  * This library provides access to the Polymer project's
  * [Data Binding](http://www.polymer-project.org/docs/polymer/databinding.html)
  * Find more information at the
  * [Polymer.dart homepage](https://www.dartlang.org/polymer-dart/).
  *
  * Extends the capabilities of the HTML Template Element by enabling it to
  * create, manage, and remove instances of content bound to data defined in
  * Dart.
  *
  * Node.bind() is a new method added to all DOM nodes which instructs them to
  * bind the named property to the data provided. These allows applications to
  * create a data model in Dart or JavaScript that DOM reacts to.
  */
 library template_binding;
 
 import 'dart:async';
 import 'dart:collection';
 import 'dart:html';
 import 'dart:svg' show SvgSvgElement;
 import 'package:observe/observe.dart';
 
+import 'src/binding_delegate.dart';
+import 'src/node_binding.dart';
 import 'src/list_diff.dart' show calculateSplices, ListChangeDelta;
 
+export 'src/binding_delegate.dart';
+export 'src/node_binding.dart' show NodeBinding;
+
 part 'src/element.dart';
 part 'src/input_bindings.dart';
 part 'src/input_element.dart';
+part 'src/instance_binding_map.dart';
 part 'src/node.dart';
 part 'src/select_element.dart';
 part 'src/template.dart';
 part 'src/template_iterator.dart';
 part 'src/text.dart';
 part 'src/text_area_element.dart';
 
 // TODO(jmesserly): ideally we would split TemplateBinding and Node.bind into
 // two packages, but this is not easy when we are faking extension methods.
 // Since TemplateElement needs to override Node.bind, it seems like the
@@ skipping 92 matching lines @@
 /**
  * Returns true if this node is semantically a template.
  *
  * A node is a template if [tagName] is TEMPLATE, or the node has the
  * 'template' attribute and this tag supports attribute form for backwards
  * compatibility with existing HTML parsers. The nodes that can use attribute
  * form are table elments (THEAD, TBODY, TFOOT, TH, TR, TD, CAPTION, COLGROUP
  * and COL), OPTION, and OPTGROUP.
  */
 bool isSemanticTemplate(Node n) => n is Element &&
-    ((n as Element).localName == 'template' || _isAttributeTemplate(n));
+    (n.localName == 'template' || _isAttributeTemplate(n));

[Siggi Cherem (dart-lang), 2013/10/29 21:00:07]

you might want to put the cast back to avoid warnings. localName is not exposed
in Node, only in Element, 

[Jennifer Messerly, 2013/10/29 23:07:19]

the tool now reports it as a redundant cast. not sure when that happened. it
confused me too :)  but I like the code better now!

 
 // TODO(jmesserly): const set would be better
 const _SEMANTIC_TEMPLATE_TAGS = const {
   'caption': null,
   'col': null,
   'colgroup': null,
   'option': null,
   'optgroup': null,
   'tbody': null,
   'td': null,
   'tfoot': null,
   'th': null,
   'thead': null,
   'tr': null,
 };
 
 
 // TODO(jmesserly): investigate if expandos give us enough performance.
 
 // The expando for storing our MDV extensions.
 //
 // In general, we need state associated with the nodes. Rather than having a
 // bunch of individual expandos, we keep one per node.
 //
 // Aside from the potentially helping performance, it also keeps things simpler
 // if we decide to integrate MDV into the DOM later, and means less code needs
 // to worry about expandos.
 final Expando _expando = new Expando('template_binding');