"Reverting 22561"

sdk/lib/html/dart2js/html_dart2js.dart

Index: sdk/lib/html/dart2js/html_dart2js.dart
diff --git a/sdk/lib/html/dart2js/html_dart2js.dart b/sdk/lib/html/dart2js/html_dart2js.dart
index 399b70c8ed33c5f6067a35c8b5e99b9207d55bb8..1e62c3476e5df482299ce497ee455c624f12e886 100644
--- a/sdk/lib/html/dart2js/html_dart2js.dart
+++ b/sdk/lib/html/dart2js/html_dart2js.dart
@@ -3,13 +3,12 @@ library dart.dom.html;
 
 import 'dart:async';
 import 'dart:collection';
-import 'dart:_collection-dev' hide Symbol;
+import 'dart:_collection-dev';
 import 'dart:html_common';
 import 'dart:indexed_db';
 import 'dart:isolate';
 import 'dart:json' as json;
 import 'dart:math';
-import 'dart:mdv_observe_impl';
 import 'dart:typed_data';
 import 'dart:svg' as svg;
 import 'dart:web_audio' as web_audio;
@@ -6038,8 +6037,6 @@ class Document extends Node  native "Document"
   @DocsEditable
   @Creates('Window|=Object')
   @Returns('Window|=Object')
-  @Creates('Window|=Object|Null')
-  @Returns('Window|=Object|Null')
   final dynamic _get_window;
 
   @DomName('Document.documentElement')
@@ -6646,8 +6643,8 @@ class DocumentFragment extends Node native "DocumentFragment" {
     e.innerHtml = value;
 
     // Copy list first since we don't want liveness during iteration.
-    List nodes = new List.from(e.nodes, growable: false);
-    this.append(nodes);
+    List nodes = new List.from(e.nodes);
+    this.nodes.addAll(nodes);
   }
 
   /**
@@ -7028,7 +7025,7 @@ class _ChildrenElementList extends ListBase<Element> {
   }
 }
 
-/**
+/** 
  * An immutable list containing HTML elements. This list contains some
  * additional methods for ease of CSS manipulation on a group of elements.
  */
@@ -7510,255 +7507,6 @@ abstract class Element extends Node implements ElementTraversal native "Element"
     throw new UnsupportedError("Not supported on this platform");
   }
 
-  @Creates('Null')
-  Map<String, StreamSubscription> _attributeBindings;
-
-  // TODO(jmesserly): I'm concerned about adding these to every element.
-  // Conceptually all of these belong on TemplateElement. They are here to
-  // support browsers that don't have <template> yet.
-  // However even in the polyfill they're restricted to certain tags
-  // (see [isTemplate]). So we can probably convert it to a (public) mixin, and
-  // only mix it in to the elements that need it.
-  @Creates('Null')  // Set from Dart code; does not instantiate a native type.
-  var _model;
-
-  @Creates('Null')  // Set from Dart code; does not instantiate a native type.
-  _TemplateIterator _templateIterator;
-
-  @Creates('Null')  // Set from Dart code; does not instantiate a native type.
-  Element _templateInstanceRef;
-
-  // Note: only used if `this is! TemplateElement`
-  @Creates('Null')  // Set from Dart code; does not instantiate a native type.
-  DocumentFragment _templateContent;
-
-  bool _templateIsDecorated;
-
-  // TODO(jmesserly): should path be optional, and default to empty path?
-  // It is used that way in at least one path in JS TemplateElement tests
-  // (see "BindImperative" test in original JS code).
-  @Experimental
-  void bind(String name, model, String path) {
-    _bindElement(this, name, model, path);
-  }
-
-  // TODO(jmesserly): this is static to work around http://dartbug.com/10166
-  // Similar issue for unbind/unbindAll below.
-  static void _bindElement(Element self, String name, model, String path) {
-    if (self._bindTemplate(name, model, path)) return;
-
-    if (self._attributeBindings == null) {
-      self._attributeBindings = new Map<String, StreamSubscription>();
-    }
-
-    self.attributes.remove(name);
-
-    var changed;
-    if (name.endsWith('?')) {
-      name = name.substring(0, name.length - 1);
-
-      changed = (value) {
-        if (_templateBooleanConversion(value)) {
-          self.attributes[name] = '';
-        } else {
-          self.attributes.remove(name);
-        }
-      };
-    } else {
-      changed = (value) {
-        // TODO(jmesserly): escape value if needed to protect against XSS.
-        // See https://github.com/toolkitchen/mdv/issues/58
-        self.attributes[name] = value == null ? '' : '$value';
-      };
-    }
-
-    self.unbind(name);
-
-    self._attributeBindings[name] =
-        new PathObserver(model, path).bindSync(changed);
-  }
-
-  @Experimental
-  void unbind(String name) {
-    _unbindElement(this, name);
-  }
-
-  static _unbindElement(Element self, String name) {
-    if (self._unbindTemplate(name)) return;
-    if (self._attributeBindings != null) {
-      var binding = self._attributeBindings.remove(name);
-      if (binding != null) binding.cancel();
-    }
-  }
-
-  @Experimental
-  void unbindAll() {
-    _unbindAllElement(this);
-  }
-
-  static void _unbindAllElement(Element self) {
-    self._unbindAllTemplate();
-
-    if (self._attributeBindings != null) {
-      for (var binding in self._attributeBindings.values) {
-        binding.cancel();
-      }
-      self._attributeBindings = null;
-    }
-  }
-
-  // TODO(jmesserly): unlike the JS polyfill, we can't mixin
-  // HTMLTemplateElement at runtime into things that are semantically template
-  // elements. So instead we implement it here with a runtime check.
-  // If the bind succeeds, we return true, otherwise we return false and let
-  // the normal Element.bind logic kick in.
-  bool _bindTemplate(String name, model, String path) {
-    if (isTemplate) {
-      switch (name) {
-        case 'bind':
-        case 'repeat':
-        case 'if':
-          _ensureTemplate();
-          if (_templateIterator == null) {
-            _templateIterator = new _TemplateIterator(this);
-          }
-          _templateIterator.inputs.bind(name, model, path);
-          return true;
-      }
-    }
-    return false;
-  }
-
-  bool _unbindTemplate(String name) {
-    if (isTemplate) {
-      switch (name) {
-        case 'bind':
-        case 'repeat':
-        case 'if':
-          _ensureTemplate();
-          if (_templateIterator != null) {
-            _templateIterator.inputs.unbind(name);
-          }
-          return true;
-      }
-    }
-    return false;
-  }
-
-  void _unbindAllTemplate() {
-    if (isTemplate) {
-      unbind('bind');
-      unbind('repeat');
-      unbind('if');
-    }
-  }
-
-  /**
-   * Gets the template this node refers to.
-   * This is only supported if [isTemplate] is true.
-   */
-  @Experimental
-  Element get ref {
-    _ensureTemplate();
-
-    Element ref = null;
-    var refId = attributes['ref'];
-    if (refId != null) {
-      ref = document.getElementById(refId);
-    }
-
-    return ref != null ? ref : _templateInstanceRef;
-  }
-
-  /**
-   * Gets the content of this template.
-   * This is only supported if [isTemplate] is true.
-   */
-  @Experimental
-  DocumentFragment get content {
-    _ensureTemplate();
-    return _templateContent;
-  }
-
-  /**
-   * Creates an instance of the template.
-   * This is only supported if [isTemplate] is true.
-   */
-  @Experimental
-  DocumentFragment createInstance() {
-    _ensureTemplate();
-
-    var template = ref;
-    if (template == null) template = this;
-
-    var instance = _createDeepCloneAndDecorateTemplates(template.content,
-        attributes['syntax']);
-
-    if (TemplateElement._instanceCreated != null) {
-      TemplateElement._instanceCreated.add(instance);
-    }
-    return instance;
-  }
-
-  /**
-   * The data model which is inherited through the tree.
-   * This is only supported if [isTemplate] is true.
-   *
-   * Setting this will destructive propagate the value to all descendant nodes,
-   * and reinstantiate all of the nodes expanded by this template.
-   *
-   * Currently this does not support propagation through Shadow DOMs.
-   */
-  @Experimental
-  get model => _model;
-
-  @Experimental
-  void set model(value) {
-    _ensureTemplate();
-
-    _model = value;
-    _addBindings(this, model);
-  }
-
-  // TODO(jmesserly): const set would be better
-  static const _TABLE_TAGS = const {
-    'caption': null,
-    'col': null,
-    'colgroup': null,
-    'tbody': null,
-    'td': null,
-    'tfoot': null,
-    'th': null,
-    'thead': null,
-    'tr': null,
-  };
-
-  bool get _isAttributeTemplate => attributes.containsKey('template') &&
-      (localName == 'option' || _TABLE_TAGS.containsKey(localName));
-
-  /**
-   * Returns true if this node is 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) and OPTION.
-   */
-  // TODO(jmesserly): this is not a public MDV API, but it seems like a useful
-  // place to document which tags our polyfill considers to be templates.
-  // Otherwise I'd be repeating it in several other places.
-  // See if we can replace this with a TemplateMixin.
-  @Experimental
-  bool get isTemplate => tagName == 'TEMPLATE' || _isAttributeTemplate;
-
-  void _ensureTemplate() {
-    if (!isTemplate) {
-      throw new UnsupportedError('$this is not a template.');
-    }
-    TemplateElement.decorate(this);
-  }
-
 
   @DomName('Element.abortEvent')
   @DocsEditable
@@ -8503,7 +8251,6 @@ abstract class Element extends Node implements ElementTraversal native "Element"
 
 }
 
-
 final _START_TAG_REGEXP = new RegExp('<(\\w+)');
 class _ElementFactoryProvider {
   static const _CUSTOM_PARENT_TAG_MAP = const {
@@ -8521,6 +8268,19 @@ class _ElementFactoryProvider {
     'track' : 'audio',
   };
 
+  // TODO(jmesserly): const set would be better
+  static const _TABLE_TAGS = const {
+    'caption': null,
+    'col': null,
+    'colgroup': null,
+    'tbody': null,
+    'td': null,
+    'tfoot': null,
+    'th': null,
+    'thead': null,
+    'tr': null,
+  };
+
   @DomName('Document.createElement')
   static Element createElement_html(String html) {
     // TODO(jacobr): this method can be made more robust and performant.
@@ -8534,7 +8294,7 @@ class _ElementFactoryProvider {
     final match = _START_TAG_REGEXP.firstMatch(html);
     if (match != null) {
       tag = match.group(1).toLowerCase();
-      if (Device.isIE && Element._TABLE_TAGS.containsKey(tag)) {
+      if (Device.isIE && _TABLE_TAGS.containsKey(tag)) {
         return _createTableForIE(html, tag);
       }
       parentTag = _CUSTOM_PARENT_TAG_MAP[tag];
@@ -10452,11 +10212,6 @@ class HtmlDocument extends Document native "HTMLDocument" {
   @SupportedBrowser(SupportedBrowser.SAFARI)
   @Experimental
   String get visibilityState => $dom_webkitVisibilityState;
-
-
-  @Creates('Null')  // Set from Dart code; does not instantiate a native type.
-  // Note: used to polyfill <template>
-  Document _templateContentsOwner;
 }
 // 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
@@ -11293,62 +11048,6 @@ class InputElement extends Element implements
     return e;
   }
 
-  @Creates('Null')  // Set from Dart code; does not instantiate a native type.
-  _ValueBinding _valueBinding;
-
-  @Creates('Null')  // Set from Dart code; does not instantiate a native type.
-  _CheckedBinding _checkedBinding;
-
-  @Experimental
-  void bind(String name, model, String path) {
-    switch (name) {
-      case 'value':
-        unbind('value');
-        attributes.remove('value');
-        _valueBinding = new _ValueBinding(this, model, path);
-        break;
-      case 'checked':
-        unbind('checked');
-        attributes.remove('checked');
-        _checkedBinding = new _CheckedBinding(this, model, path);
-        break;
-      default:
-        // TODO(jmesserly): this should be "super" (http://dartbug.com/10166).
-        // Similar issue for unbind/unbindAll below.
-        Element._bindElement(this, name, model, path);
-        break;
-    }
-  }
-
-  @Experimental
-  void unbind(String name) {
-    switch (name) {
-      case 'value':
-        if (_valueBinding != null) {
-          _valueBinding.unbind();
-          _valueBinding = null;
-        }
-        break;
-      case 'checked':
-        if (_checkedBinding != null) {
-          _checkedBinding.unbind();
-          _checkedBinding = null;
-        }
-        break;
-      default:
-        Element._unbindElement(this, name);
-        break;
-    }
-  }
-
-  @Experimental
-  void unbindAll() {
-    unbind('value');
-    unbind('checked');
-    Element._unbindAllElement(this);
-  }
-
-
   @DomName('HTMLInputElement.webkitSpeechChangeEvent')
   @DocsEditable
   @SupportedBrowser(SupportedBrowser.CHROME)
@@ -14620,7 +14319,7 @@ class _ChildNodeListLazy extends ListBase<Node> {
     // time.
     Node child = _this.$dom_firstChild;
     while (child != null) {
-      Node nextChild = child.nextNode;
+      Node nextChild = child.nextSibling;
       if (test(child) == removeMatching) {
         _this.$dom_removeChild(child);
       }
@@ -14745,49 +14444,94 @@ class Node extends EventTarget native "Node" {
     }
   }
 
-  /**
-   * Print out a String representation of this Node.
-   */
-  String toString() => localName == null ?
-      (nodeValue == null ? super.toString() : nodeValue) : localName;
+  // Note that this may either be the locally set model or a cached value
+  // of the inherited model. This is cached to minimize model change
+  // notifications.
+  @Creates('Null')
+  var _model;
+  bool _hasLocalModel;
+  Set<StreamController<Node>> _modelChangedStreams;
 
   /**
-   * Binds the attribute [name] to the [path] of the [model].
-   * Path is a String of accessors such as `foo.bar.baz`.
+   * The data model which is inherited through the tree.
+   *
+   * Setting this will propagate the value to all descendant nodes. If the
+   * model is not set on this node then it will be inherited from ancestor
+   * nodes.
+   *
+   * Currently this does not support propagation through Shadow DOMs.
+   *
+   * [clearModel] must be used to remove the model property from this node
+   * and have the model inherit from ancestor nodes.
    */
   @Experimental
-  void bind(String name, model, String path) {
-    // TODO(jmesserly): should we throw instead?
-    window.console.error('Unhandled binding to Node: '
-        '$this $name $model $path');
+  get model {
+    // If we have a change handler then we've cached the model locally.
+    if (_modelChangedStreams != null && !_modelChangedStreams.isEmpty) {
+      return _model;
+    }
+    // Otherwise start looking up the tree.
+    for (var node = this; node != null; node = node.parentNode) {
+      if (node._hasLocalModel == true) {
+        return node._model;
+      }
+    }
+    return null;
   }
 
-  /** Unbinds the attribute [name]. */
   @Experimental
-  void unbind(String name) {}
+  void set model(value) {
+    var changed = model != value;
+    _model = value;
+    _hasLocalModel = true;
+    _ModelTreeObserver.initialize();
 
-  /** Unbinds all bound attributes. */
-  @Experimental
-  void unbindAll() {}
+    if (changed) {
+      if (_modelChangedStreams != null && !_modelChangedStreams.isEmpty) {
+        _modelChangedStreams.toList().forEach((stream) => stream.add(this));
+      }
+      // Propagate new model to all descendants.
+      _ModelTreeObserver.propagateModel(this, value, false);
+    }
+  }
 
-  TemplateInstance _templateInstance;
+  /**
+   * Clears the locally set model and makes this model be inherited from parent
+   * nodes.
+   */
+  @Experimental
+  void clearModel() {
+    if (_hasLocalModel == true) {
+      _hasLocalModel = false;
 
-  // TODO(arv): Consider storing all "NodeRareData" on a single object?
-  int __instanceTerminatorCount;
-  int get _instanceTerminatorCount {
-    if (__instanceTerminatorCount == null) return 0;
-    return __instanceTerminatorCount;
+      // Propagate new model to all descendants.
+      if (parentNode != null) {
+        _ModelTreeObserver.propagateModel(this, parentNode.model, false);
+      } else {
+        _ModelTreeObserver.propagateModel(this, null, false);
+      }
+    }
   }
-  set _instanceTerminatorCount(int value) {
-    if (value == 0) value = null;
-    __instanceTerminatorCount = value;
+
+  /**
+   * Get a stream of models, whenever the model changes.
+   */
+  Stream<Node> get onModelChanged {
+    if (_modelChangedStreams == null) {
+      _modelChangedStreams = new Set<StreamController<Node>>();
+    }
+    var controller;
+    controller = new StreamController(
+        onListen: () { _modelChangedStreams.add(controller); },
+        onCancel: () { _modelChangedStreams.remove(controller); });
+    return controller.stream;
   }
 
-  /** Gets the template instance that instantiated this node, if any. */
-  @Experimental
-  TemplateInstance get templateInstance =>
-      _templateInstance != null ? _templateInstance :
-      (parent != null ? parent.templateInstance : null);
+  /**
+   * Print out a String representation of this Node.
+   */
+  String toString() => localName == null ?
+      (nodeValue == null ? super.toString() : nodeValue) : localName;
 
 
   static const int ATTRIBUTE_NODE = 2;
@@ -18666,10 +18410,8 @@ class TableSectionElement extends Element native "HTMLTableSectionElement" {
 // 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.
 
-// WARNING: Do not edit - generated code.
-
 
-@Experimental
+@DocsEditable
 @DomName('HTMLTemplateElement')
 @SupportedBrowser(SupportedBrowser.CHROME)
 @Experimental
@@ -18682,118 +18424,9 @@ class TemplateElement extends Element native "HTMLTemplateElement" {
   /// Checks if this type is supported on the current platform.
   static bool get supported => Element.isTagSupported('template');
 
-  @JSName('content')
   @DomName('HTMLTemplateElement.content')
   @DocsEditable
-  final DocumentFragment $dom_content;
-
-
-  // For real TemplateElement use the actual DOM .content field instead of
-  // our polyfilled expando.
-  @Experimental
-  DocumentFragment get content => $dom_content;
-
-  static StreamController<DocumentFragment> _instanceCreated;
-
-  /**
-   * *Warning*: This is an implementation helper for Model-Driven Views and
-   * should not be used in your code.
-   *
-   * This event is fired whenever a template is instantiated via
-   * [createInstance].
-   */
-  // TODO(rafaelw): This is a hack, and is neccesary for the polyfill
-  // because custom elements are not upgraded during clone()
-  @Experimental
-  static Stream<DocumentFragment> get instanceCreated {
-    if (_instanceCreated == null) {
-      _instanceCreated = new StreamController<DocumentFragment>();
-    }
-    return _instanceCreated.stream;
-  }
-
-  /**
-   * Ensures proper API and content model for template elements.
-   *
-   * [instanceRef] can be used to set the [Element.ref] property of [template],
-   * and use the ref's content will be used as source when createInstance() is
-   * invoked.
-   *
-   * Returns true if this template was just decorated, or false if it was
-   * already decorated.
-   */
-  @Experimental
-  static bool decorate(Element template, [Element instanceRef]) {
-    // == true check because it starts as a null field.
-    if (template._templateIsDecorated == true) return false;
-
-    template._templateIsDecorated = true;
-
-    _injectStylesheet();
-
-    // Create content
-    if (template is! TemplateElement) {
-      var doc = _getTemplateContentsOwner(template.document);
-      template._templateContent = doc.createDocumentFragment();
-    }
-
-    if (instanceRef != null) {
-      template._templateInstanceRef = instanceRef;
-      return true; // content is empty.
-    }
-
-    if (template is TemplateElement) {
-      _bootstrapTemplatesRecursivelyFrom(template.content);
-    } else {
-      _liftNonNativeTemplateChildrenIntoContent(template);
-    }
-
-    return true;
-  }
-
-  /**
-   * This used to decorate recursively all templates from a given node.
-   *
-   * By default [decorate] will be called on templates lazily when certain
-   * properties such as [model] are accessed, but it can be run eagerly to
-   * decorate an entire tree recursively.
-   */
-  // TODO(rafaelw): Review whether this is the right public API.
-  @Experimental
-  static void bootstrap(Node content) {
-    _bootstrapTemplatesRecursivelyFrom(content);
-  }
-
-  static bool _initStyles;
-
-  static void _injectStylesheet() {
-    if (_initStyles == true) return;
-    _initStyles = true;
-
-    var style = new StyleElement();
-    style.text = r'''
-template,
-thead[template],
-tbody[template],
-tfoot[template],
-th[template],
-tr[template],
-td[template],
-caption[template],
-colgroup[template],
-col[template],
-option[template] {
-  display: none;
-}''';
-    document.head.append(style);
-  }
-
-  /**
-   * A mapping of names to Custom Syntax objects. See [CustomBindingSyntax] for
-   * more information.
-   */
-  @Experimental
-  static Map<String, CustomBindingSyntax> syntax = {};
+  final DocumentFragment content;
 }
 // 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
@@ -18826,55 +18459,19 @@ class Text extends CharacterData native "Text" {
   @DocsEditable
   Text splitText(int offset) native;
 
+}
+// 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.
 
-  @Creates('Null')  // Set from Dart code; does not instantiate a native type.
-  StreamSubscription _textBinding;
-
-  @Experimental
-  void bind(String name, model, String path) {
-    if (name != 'text') {
-      super.bind(name, model, path);
-      return;
-    }
 
-    unbind('text');
+@DocsEditable
+@DomName('HTMLTextAreaElement')
+class TextAreaElement extends Element native "HTMLTextAreaElement" {
 
-    _textBinding = new PathObserver(model, path).bindSync((value) {
-      text = value == null ? '' : '$value';
-    });
-  }
-
-  @Experimental
-  void unbind(String name) {
-    if (name != 'text') {
-      super.unbind(name);
-      return;
-    }
-
-    if (_textBinding == null) return;
-
-    _textBinding.cancel();
-    _textBinding = null;
-  }
-
-  @Experimental
-  void unbindAll() {
-    unbind('text');
-    super.unbindAll();
-  }
-}
-// Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-
-@DocsEditable
-@DomName('HTMLTextAreaElement')
-class TextAreaElement extends Element native "HTMLTextAreaElement" {
-
-  @DomName('HTMLTextAreaElement.HTMLTextAreaElement')
-  @DocsEditable
-  factory TextAreaElement() => document.$dom_createElement("textarea");
+  @DomName('HTMLTextAreaElement.HTMLTextAreaElement')
+  @DocsEditable
+  factory TextAreaElement() => document.$dom_createElement("textarea");
 
   @DomName('HTMLTextAreaElement.autofocus')
   @DocsEditable
@@ -24437,290 +24034,100 @@ abstract class KeyName {
 // BSD-style license that can be found in the LICENSE file.
 
 
-// This code is inspired by ChangeSummary:
-// https://github.com/rafaelw/ChangeSummary/blob/master/change_summary.js
-// ...which underlies MDV. Since we don't need the functionality of
-// ChangeSummary, we just implement what we need for data bindings.
-// This allows our implementation to be much simpler.
-
-// TODO(jmesserly): should we make these types stronger, and require
-// Observable objects? Currently, it is fine to say something like:
-//     var path = new PathObserver(123, '');
-//     print(path.value); // "123"
-//
-// Furthermore this degenerate case is allowed:
-//     var path = new PathObserver(123, 'foo.bar.baz.qux');
-//     print(path.value); // "null"
-//
-// Here we see that any invalid (i.e. not Observable) value will break the
-// path chain without producing an error or exception.
-//
-// Now the real question: should we do this? For the former case, the behavior
-// is correct but we could chose to handle it in the dart:html bindings layer.
-// For the latter case, it might be better to throw an error so users can find
-// the problem.
-
-
-// TODO(jmesserly): the primary reason to have this object exposed is because
-// we have get/set for value. Ideally "observePath" could just return the
-// stream.
-/**
- * A data-bound path starting from a view-model or model object, for example
- * `foo.bar.baz`.
- *
- * When the [values] stream is being listened to, this will observe changes to
- * the object and any intermediate object along the path, and send [values]
- * accordingly. When all listeners are unregistered it will stop observing
- * the objects.
- *
- * This class is used to implement [Node.bind] and similar functionality.
- */
-@Experimental
-class PathObserver {
-  /** The object being observed. */
-  final object;
-
-  /** The path string. */
-  final String path;
-
-  /** True if the path is valid, otherwise false. */
-  final bool _isValid;
-
-  // TODO(jmesserly): same issue here as ObservableMixin: is there an easier
-  // way to get a broadcast stream?
-  StreamController _values;
-  Stream _valueStream;
-
-  _PropertyObserver _observer, _lastObserver;
-
-  Object _lastValue;
-  bool _scheduled = false;
+class _ModelTreeObserver {
+  static bool _initialized = false;
 
   /**
-   * Observes [path] on [object] for changes. This returns an object that can be
-   * used to get the changes and get/set the value at this path.
-   * See [PathObserver.values] and [PathObserver.value].
+   * Start an observer watching the document for tree changes to automatically
+   * propagate model changes.
+   *
+   * Currently this does not support propagation through Shadow DOMs.
    */
-  PathObserver(this.object, String path)
-    : path = path,
-      _isValid = _isPathValid(path) {
-
-    // TODO(jmesserly): if the path is empty, or the object is! Observable, we
-    // can optimize the PathObserver to be more lightweight.
-
-    _values = new StreamController(onListen: _observe, onCancel: _unobserve);
-
-    if (_isValid) {
-      var segments = [];
-      for (var segment in path.trim().split('.')) {
-        if (segment == '') continue;
-        var index = int.parse(segment, onError: (_) {});
-        segments.add(index != null ? index : new Symbol(segment));
-      }
+  static void initialize() {
+    if (!_initialized) {
+      _initialized = true;
 
-      // Create the property observer linked list.
-      // Note that the structure of a path can't change after it is initially
-      // constructed, even though the objects along the path can change.
-      for (int i = segments.length - 1; i >= 0; i--) {
-        _observer = new _PropertyObserver(this, segments[i], _observer);
-        if (_lastObserver == null) _lastObserver = _observer;
+      if (MutationObserver.supported) {
+        var observer = new MutationObserver(_processTreeChange);
+        observer.observe(document, childList: true, subtree: true);
+      } else {
+        document.on['DOMNodeInserted'].listen(_handleNodeInserted);
+        document.on['DOMNodeRemoved'].listen(_handleNodeRemoved);
       }
     }
   }
 
-  // TODO(jmesserly): we could try adding the first value to the stream, but
-  // that delivers the first record async.
-  /**
-   * Listens to the stream, and invokes the [callback] immediately with the
-   * current [value]. This is useful for bindings, which want to be up-to-date
-   * immediately.
-   */
-  StreamSubscription bindSync(void callback(value)) {
-    var result = values.listen(callback);
-    callback(value);
-    return result;
-  }
-
-  // TODO(jmesserly): should this be a change record with the old value?
-  // TODO(jmesserly): should this be a broadcast stream? We only need
-  // single-subscription in the bindings system, so single sub saves overhead.
-  /**
-   * Gets the stream of values that were observed at this path.
-   * This returns a single-subscription stream.
-   */
-  Stream get values => _values.stream;
-
-  /** Force synchronous delivery of [values]. */
-  void _deliverValues() {
-    _scheduled = false;
-
-    var newValue = value;
-    if (!identical(_lastValue, newValue)) {
-      _values.add(newValue);
-      _lastValue = newValue;
-    }
-  }
-
-  void _observe() {
-    if (_observer != null) {
-      _lastValue = value;
-      _observer.observe();
-    }
-  }
-
-  void _unobserve() {
-    if (_observer != null) _observer.unobserve();
-  }
-
-  void _notifyChange() {
-    if (_scheduled) return;
-    _scheduled = true;
-
-    // TODO(jmesserly): should we have a guarenteed order with respect to other
-    // paths? If so, we could implement this fairly easily by sorting instances
-    // of this class by birth order before delivery.
-    queueChangeRecords(_deliverValues);
-  }
-
-  /** Gets the last reported value at this path. */
-  get value {
-    if (!_isValid) return null;
-    if (_observer == null) return object;
-    _observer.ensureValue(object);
-    return _lastObserver.value;
-  }
-
-  /** Sets the value at this path. */
-  void set value(Object value) {
-    // TODO(jmesserly): throw if property cannot be set?
-    // MDV seems tolerant of these error.
-    if (_observer == null || !_isValid) return;
-    _observer.ensureValue(object);
-    var last = _lastObserver;
-    if (_setObjectProperty(last._object, last._property, value)) {
-      // Technically, this would get updated asynchronously via a change record.
-      // However, it is nice if calling the getter will yield the same value
-      // that was just set. So we use this opportunity to update our cache.
-      last.value = value;
+  static void _processTreeChange(List<MutationRecord> mutations,
+      MutationObserver observer) {
+    for (var record in mutations) {
+      for (var node in record.addedNodes) {
+        // When nodes enter the document we need to make sure that all of the
+        // models are properly propagated through the entire sub-tree.
+        propagateModel(node, _calculatedModel(node), true);
+      }
+      for (var node in record.removedNodes) {
+        propagateModel(node, _calculatedModel(node), false);
+      }
     }
   }
-}
 
-// TODO(jmesserly): these should go away in favor of mirrors!
-_getObjectProperty(object, property) {
-  if (object is List && property is int) {
-    if (property >= 0 && property < object.length) {
-      return object[property];
-    } else {
-      return null;
-    }
+  static void _handleNodeInserted(MutationEvent e) {
+    var node = e.target;
+    window.setImmediate(() {
+      propagateModel(node, _calculatedModel(node), true);
+    });
   }
 
-  // TODO(jmesserly): what about length?
-  if (object is Map) return object[property];
-
-  if (object is Observable) return object.getValueWorkaround(property);
-
-  return null;
-}
-
-bool _setObjectProperty(object, property, value) {
-  if (object is List && property is int) {
-    object[property] = value;
-  } else if (object is Map) {
-    object[property] = value;
-  } else if (object is Observable) {
-    (object as Observable).setValueWorkaround(property, value);
-  } else {
-    return false;
+  static void _handleNodeRemoved(MutationEvent e) {
+    var node = e.target;
+    window.setImmediate(() {
+      propagateModel(node, _calculatedModel(node), false);
+    });
   }
-  return true;
-}
-
-
-class _PropertyObserver {
-  final PathObserver _path;
-  final _property;
-  final Symbol _symbol;
-  final _PropertyObserver _next;
-
-  // TODO(jmesserly): would be nice not to store both of these.
-  Object _object;
-  Object _value;
-  StreamSubscription _sub;
-
-  _PropertyObserver(this._path, this._property, this._next);
-
-  get value => _value;
 
-  void set value(Object newValue) {
-    _value = newValue;
-    if (_next != null) {
-      if (_sub != null) _next.unobserve();
-      _next.ensureValue(_value);
-      if (_sub != null) _next.observe();
+  /**
+   * Figures out what the model should be for a node, avoiding any cached
+   * model values.
+   */
+  static _calculatedModel(node) {
+    if (node._hasLocalModel == true) {
+      return node._model;
+    } else if (node.parentNode != null) {
+      return node.parentNode._model;
     }
+    return null;
   }
 
-  void ensureValue(object) {
-    // If we're observing, values should be up to date already.
-    if (_sub != null) return;
-
-    _object = object;
-    value = _getObjectProperty(object, _property);
-  }
-
-  void observe() {
-    if (_object is Observable) {
-      assert(_sub == null);
-      _sub = (_object as Observable).changes.listen(_onChange);
+  /**
+   * Pushes model changes down through the tree.
+   *
+   * Set fullTree to true if the state of the tree is unknown and model changes
+   * should be propagated through the entire tree.
+   */
+  static void propagateModel(Node node, model, bool fullTree) {
+    // Calling into user code with the != call could generate exceptions.
+    // Catch and report them a global exceptions.
+    try {
+      if (node._hasLocalModel != true && node._model != model &&
+          node._modelChangedStreams != null &&
+          !node._modelChangedStreams.isEmpty) {
+        node._model = model;
+        node._modelChangedStreams.toList()
+          .forEach((controller) => controller.add(node));
+      }
+    } catch (e, s) {
+      new Future.error(e, s);
     }
-    if (_next != null) _next.observe();
-  }
-
-  void unobserve() {
-    if (_sub == null) return;
-
-    _sub.cancel();
-    _sub = null;
-    if (_next != null) _next.unobserve();
-  }
-
-  void _onChange(List<ChangeRecord> changes) {
-    for (var change in changes) {
-      // TODO(jmesserly): what to do about "new Symbol" here?
-      // Ideally this would only preserve names if the user has opted in to
-      // them being preserved.
-      // TODO(jmesserly): should we drop observable maps with String keys?
-      // If so then we only need one check here.
-      if (change.changes(_property)) {
-        value = _getObjectProperty(_object, _property);
-        _path._notifyChange();
-        return;
+    for (var child = node.$dom_firstChild; child != null;
+        child = child.nextNode) {
+      if (child._hasLocalModel != true) {
+        propagateModel(child, model, fullTree);
+      } else if (fullTree) {
+        propagateModel(child, child._model, true);
       }
     }
   }
 }
-
-// From: https://github.com/rafaelw/ChangeSummary/blob/master/change_summary.js
-
-const _pathIndentPart = r'[$a-z0-9_]+[$a-z0-9_\d]*';
-final _pathRegExp = new RegExp('^'
-    '(?:#?' + _pathIndentPart + ')?'
-    '(?:'
-      '(?:\\.' + _pathIndentPart + ')'
-    ')*'
-    r'$', caseSensitive: false);
-
-final _spacesRegExp = new RegExp(r'\s');
-
-bool _isPathValid(String s) {
-  s = s.replaceAll(_spacesRegExp, '');
-
-  if (s == '') return true;
-  if (s[0] == '.') return false;
-  return _pathRegExp.hasMatch(s);
-}
 // 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.
@@ -24943,781 +24350,6 @@ class Rect {
   Point get bottomRight => new Point(this.left + this.width,
       this.top + this.height);
 }
-// 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 code is a port of Model-Driven-Views:
-// https://github.com/toolkitchen/mdv
-// The code mostly comes from src/template_element.js
-
-typedef void _ChangeHandler(value);
-
-/**
- * Model-Driven Views (MDV)'s native features enables a wide-range of use cases,
- * but (by design) don't attempt to implement a wide array of specialized
- * behaviors.
- *
- * Enabling these features in MDV is a matter of implementing and registering an
- * MDV Custom Syntax. A Custom Syntax is an object which contains one or more
- * delegation functions which implement specialized behavior. This object is
- * registered with MDV via [TemplateElement.syntax]:
- *
- *
- * HTML:
- *     <template bind syntax="MySyntax">
- *       {{ What!Ever('crazy')->thing^^^I+Want(data) }}
- *     </template>
- *
- * Dart:
- *     class MySyntax extends CustomBindingSyntax {
- *       getBinding(model, path, name, node) {
- *         // The magic happens here!
- *       }
- *     }
- *
- *     ...
- *
- *     TemplateElement.syntax['MySyntax'] = new MySyntax();
- *
- * See <https://github.com/toolkitchen/mdv/blob/master/docs/syntax.md> for more
- * information about Custom Syntax.
- */
-// TODO(jmesserly): if this is just one method, a function type would make it
-// more Dart-friendly.
-@Experimental
-abstract class CustomBindingSyntax {
-  // TODO(jmesserly): I had to remove type annotations from "name" and "node"
-  // Normally they are String and Node respectively. But sometimes it will pass
-  // (int name, CompoundBinding node). That seems very confusing; we may want
-  // to change this API.
-  getBinding(model, String path, name, node);
-}
-
-/** The callback used in the [CompoundBinding.combinator] field. */
-@Experimental
-typedef Object CompoundBindingCombinator(Map objects);
-
-/** Information about the instantiated template. */
-@Experimental
-class TemplateInstance {
-  // TODO(rafaelw): firstNode & lastNode should be read-synchronous
-  // in cases where script has modified the template instance boundary.
-
-  /** The first node of this template instantiation. */
-  final Node firstNode;
-
-  /**
-   * The last node of this template instantiation.
-   * This could be identical to [firstNode] if the template only expanded to a
-   * single node.
-   */
-  final Node lastNode;
-
-  /** The model used to instantiate the template. */
-  final model;
-
-  TemplateInstance(this.firstNode, this.lastNode, this.model);
-}
-
-/**
- * Model-Driven Views contains a helper object which is useful for the
- * implementation of a Custom Syntax.
- *
- *     var binding = new CompoundBinding((values) {
- *       var combinedValue;
- *       // compute combinedValue based on the current values which are provided
- *       return combinedValue;
- *     });
- *     binding.bind('name1', obj1, path1);
- *     binding.bind('name2', obj2, path2);
- *     //...
- *     binding.bind('nameN', objN, pathN);
- *
- * CompoundBinding is an object which knows how to listen to multiple path
- * values (registered via [bind]) and invoke its [combinator] when one or more
- * of the values have changed and set its [value] property to the return value
- * of the function. When any value has changed, all current values are provided
- * to the [combinator] in the single `values` argument.
- *
- * See [CustomBindingSyntax] for more information.
- */
-// TODO(jmesserly): what is the public API surface here? I just guessed;
-// most of it seemed non-public.
-@Experimental
-class CompoundBinding extends ObservableBase {
-  CompoundBindingCombinator _combinator;
-
-  // TODO(jmesserly): ideally these would be String keys, but sometimes we
-  // use integers.
-  Map<dynamic, StreamSubscription> _bindings = new Map();
-  Map _values = new Map();
-  bool _scheduled = false;
-  bool _disposed = false;
-  Object _value;
-
-  CompoundBinding([CompoundBindingCombinator combinator]) {
-    // TODO(jmesserly): this is a tweak to the original code, it seemed to me
-    // that passing the combinator to the constructor should be equivalent to
-    // setting it via the property.
-    // I also added a null check to the combinator setter.
-    this.combinator = combinator;
-  }
-
-  CompoundBindingCombinator get combinator => _combinator;
-
-  set combinator(CompoundBindingCombinator combinator) {
-    _combinator = combinator;
-    if (combinator != null) _scheduleResolve();
-  }
-
-  static const _VALUE = const Symbol('value');
-
-  get value => _value;
-
-  void set value(newValue) {
-    _value = notifyPropertyChange(_VALUE, _value, newValue);
-  }
-
-  // TODO(jmesserly): remove these workarounds when dart2js supports mirrors!
-  getValueWorkaround(key) {
-    if (key == _VALUE) return value;
-    return null;
-  }
-  setValueWorkaround(key, val) {
-    if (key == _VALUE) value = val;
-  }
-
-  void bind(name, model, String path) {
-    unbind(name);
-
-    _bindings[name] = new PathObserver(model, path).bindSync((value) {
-      _values[name] = value;
-      _scheduleResolve();
-    });
-  }
-
-  void unbind(name, {bool suppressResolve: false}) {
-    var binding = _bindings.remove(name);
-    if (binding == null) return;
-
-    binding.cancel();
-    _values.remove(name);
-    if (!suppressResolve) _scheduleResolve();
-  }
-
-  // TODO(rafaelw): Is this the right processing model?
-  // TODO(rafaelw): Consider having a seperate ChangeSummary for
-  // CompoundBindings so to excess dirtyChecks.
-  void _scheduleResolve() {
-    if (_scheduled) return;
-    _scheduled = true;
-    queueChangeRecords(resolve);
-  }
-
-  void resolve() {
-    if (_disposed) return;
-    _scheduled = false;
-
-    if (_combinator == null) {
-      throw new StateError(
-          'CompoundBinding attempted to resolve without a combinator');
-    }
-
-    value = _combinator(_values);
-  }
-
-  void dispose() {
-    for (var binding in _bindings.values) {
-      binding.cancel();
-    }
-    _bindings.clear();
-    _values.clear();
-
-    _disposed = true;
-    value = null;
-  }
-}
-
-Stream<Event> _getStreamForInputType(InputElement element) {
-  switch (element.type) {
-    case 'checkbox':
-      return element.onClick;
-    case 'radio':
-    case 'select-multiple':
-    case 'select-one':
-      return element.onChange;
-    default:
-      return element.onInput;
-  }
-}
-
-abstract class _InputBinding {
-  final InputElement element;
-  PathObserver binding;
-  StreamSubscription _pathSub;
-  StreamSubscription _eventSub;
-
-  _InputBinding(this.element, model, String path) {
-    binding = new PathObserver(model, path);
-    _pathSub = binding.bindSync(valueChanged);
-    _eventSub = _getStreamForInputType(element).listen(updateBinding);
-  }
-
-  void valueChanged(newValue);
-
-  void updateBinding(e);
-
-  void unbind() {
-    binding = null;
-    _pathSub.cancel();
-    _eventSub.cancel();
-  }
-}
-
-class _ValueBinding extends _InputBinding {
-  _ValueBinding(element, model, path) : super(element, model, path);
-
-  void valueChanged(value) {
-    element.value = value == null ? '' : '$value';
-  }
-
-  void updateBinding(e) {
-    binding.value = element.value;
-  }
-}
-
-// TODO(jmesserly): not sure what kind of boolean conversion rules to
-// apply for template data-binding. HTML attributes are true if they're present.
-// However Dart only treats "true" as true. Since this is HTML we'll use
-// something closer to the HTML rules: null (missing) and false are false,
-// everything else is true. See: https://github.com/toolkitchen/mdv/issues/59
-bool _templateBooleanConversion(value) => null != value && false != value;
-
-class _CheckedBinding extends _InputBinding {
-  _CheckedBinding(element, model, path) : super(element, model, path);
-
-  void valueChanged(value) {
-    element.checked = _templateBooleanConversion(value);
-  }
-
-  void updateBinding(e) {
-    binding.value = element.checked;
-
-    // Only the radio button that is getting checked gets an event. We
-    // therefore find all the associated radio buttons and update their
-    // CheckedBinding manually.
-    if (element is InputElement && element.type == 'radio') {
-      for (var r in _getAssociatedRadioButtons(element)) {
-        var checkedBinding = r._checkedBinding;
-        if (checkedBinding != null) {
-          // Set the value directly to avoid an infinite call stack.
-          checkedBinding.binding.value = false;
-        }
-      }
-    }
-  }
-}
-
-// TODO(jmesserly): polyfill document.contains API instead of doing it here
-bool _isNodeInDocument(Node node) {
-  // On non-IE this works:
-  // return node.document.contains(node);
-  var document = node.document;
-  if (node == document || node.parentNode == document) return true;
-  return document.documentElement.contains(node);
-}
-
-// |element| is assumed to be an HTMLInputElement with |type| == 'radio'.
-// Returns an array containing all radio buttons other than |element| that
-// have the same |name|, either in the form that |element| belongs to or,
-// if no form, in the document tree to which |element| belongs.
-//
-// This implementation is based upon the HTML spec definition of a
-// "radio button group":
-//   http://www.whatwg.org/specs/web-apps/current-work/multipage/number-state.html#radio-button-group
-//
-Iterable _getAssociatedRadioButtons(element) {
-  if (!_isNodeInDocument(element)) return [];
-  if (element.form != null) {
-    return element.form.nodes.where((el) {
-      return el != element &&
-          el is InputElement &&
-          el.type == 'radio' &&
-          el.name == element.name;
-    });
-  } else {
-    var radios = element.document.queryAll(
-        'input[type="radio"][name="${element.name}"]');
-    return radios.where((el) => el != element && el.form == null);
-  }
-}
-
-Node _createDeepCloneAndDecorateTemplates(Node node, String syntax) {
-  var clone = node.clone(false); // Shallow clone.
-  if (clone is Element && clone.isTemplate) {
-    TemplateElement.decorate(clone, node);
-    if (syntax != null) {
-      clone.attributes.putIfAbsent('syntax', () => syntax);
-    }
-  }
-
-  for (var c = node.$dom_firstChild; c != null; c = c.nextNode) {
-    clone.append(_createDeepCloneAndDecorateTemplates(c, syntax));
-  }
-  return clone;
-}
-
-// http://dvcs.w3.org/hg/webcomponents/raw-file/tip/spec/templates/index.html#dfn-template-contents-owner
-Document _getTemplateContentsOwner(Document doc) {
-  if (doc.window == null) {
-    return doc;
-  }
-  var d = doc._templateContentsOwner;
-  if (d == null) {
-    // TODO(arv): This should either be a Document or HTMLDocument depending
-    // on doc.
-    d = doc.implementation.createHtmlDocument('');
-    while (d.$dom_lastChild != null) {
-      d.$dom_lastChild.remove();
-    }
-    doc._templateContentsOwner = d;
-  }
-  return d;
-}
-
-Element _cloneAndSeperateAttributeTemplate(Element templateElement) {
-  var clone = templateElement.clone(false);
-  var attributes = templateElement.attributes;
-  for (var name in attributes.keys.toList()) {
-    switch (name) {
-      case 'template':
-      case 'repeat':
-      case 'bind':
-      case 'ref':
-        clone.attributes.remove(name);
-        break;
-      default:
-        attributes.remove(name);
-        break;
-    }
-  }
-
-  return clone;
-}
-
-void _liftNonNativeTemplateChildrenIntoContent(Element templateElement) {
-  var content = templateElement.content;
-
-  if (!templateElement._isAttributeTemplate) {
-    var child;
-    while ((child = templateElement.$dom_firstChild) != null) {
-      content.append(child);
-    }
-    return;
-  }
-
-  // For attribute templates we copy the whole thing into the content and
-  // we move the non template attributes into the content.
-  //
-  //   <tr foo template>
-  //
-  // becomes
-  //
-  //   <tr template>
-  //   + #document-fragment
-  //     + <tr foo>
-  //
-  var newRoot = _cloneAndSeperateAttributeTemplate(templateElement);
-  var child;
-  while ((child = templateElement.$dom_firstChild) != null) {
-    newRoot.append(child);
-  }
-  content.append(newRoot);
-}
-
-void _bootstrapTemplatesRecursivelyFrom(Node node) {
-  void bootstrap(template) {
-    if (!TemplateElement.decorate(template)) {
-      _bootstrapTemplatesRecursivelyFrom(template.content);
-    }
-  }
-
-  // Need to do this first as the contents may get lifted if |node| is
-  // template.
-  // TODO(jmesserly): node is DocumentFragment or Element
-  var templateDescendents = (node as dynamic).queryAll(_allTemplatesSelectors);
-  if (node is Element && node.isTemplate) bootstrap(node);
-
-  templateDescendents.forEach(bootstrap);
-}
-
-final String _allTemplatesSelectors = 'template, option[template], ' +
-    Element._TABLE_TAGS.keys.map((k) => "$k[template]").join(", ");
-
-void _addBindings(Node node, model, [CustomBindingSyntax syntax]) {
-  if (node is Element) {
-    _addAttributeBindings(node, model, syntax);
-  } else if (node is Text) {
-    _parseAndBind(node, node.text, 'text', model, syntax);
-  }
-
-  for (var c = node.$dom_firstChild; c != null; c = c.nextNode) {
-    _addBindings(c, model, syntax);
-  }
-}
-
-
-void _addAttributeBindings(Element element, model, syntax) {
-  element.attributes.forEach((name, value) {
-    if (value == '' && (name == 'bind' || name == 'repeat')) {
-      value = '{{}}';
-    }
-    _parseAndBind(element, value, name, model, syntax);
-  });
-}
-
-void _parseAndBind(Node node, String text, String name, model,
-    CustomBindingSyntax syntax) {
-
-  var tokens = _parseMustacheTokens(text);
-  if (tokens.length == 0 || (tokens.length == 1 && tokens[0].isText)) {
-    return;
-  }
-
-  if (tokens.length == 1 && tokens[0].isBinding) {
-    _bindOrDelegate(node, name, model, tokens[0].value, syntax);
-    return;
-  }
-
-  var replacementBinding = new CompoundBinding();
-  for (var i = 0; i < tokens.length; i++) {
-    var token = tokens[i];
-    if (token.isBinding) {
-      _bindOrDelegate(replacementBinding, i, model, token.value, syntax);
-    }
-  }
-
-  replacementBinding.combinator = (values) {
-    var newValue = new StringBuffer();
-
-    for (var i = 0; i < tokens.length; i++) {
-      var token = tokens[i];
-      if (token.isText) {
-        newValue.write(token.value);
-      } else {
-        var value = values[i];
-        if (value != null) {
-          newValue.write(value);
-        }
-      }
-    }
-
-    return newValue.toString();
-  };
-
-  node.bind(name, replacementBinding, 'value');
-}
-
-void _bindOrDelegate(node, name, model, String path,
-    CustomBindingSyntax syntax) {
-
-  if (syntax != null) {
-    var delegateBinding = syntax.getBinding(model, path, name, node);
-    if (delegateBinding != null) {
-      model = delegateBinding;
-      path = 'value';
-    }
-  }
-
-  node.bind(name, model, path);
-}
-
-class _BindingToken {
-  final String value;
-  final bool isBinding;
-
-  _BindingToken(this.value, {this.isBinding: false});
-
-  bool get isText => !isBinding;
-}
-
-List<_BindingToken> _parseMustacheTokens(String s) {
-  var result = [];
-  var length = s.length;
-  var index = 0, lastIndex = 0;
-  while (lastIndex < length) {
-    index = s.indexOf('{{', lastIndex);
-    if (index < 0) {
-      result.add(new _BindingToken(s.substring(lastIndex)));
-      break;
-    } else {
-      // There is a non-empty text run before the next path token.
-      if (index > 0 && lastIndex < index) {
-        result.add(new _BindingToken(s.substring(lastIndex, index)));
-      }
-      lastIndex = index + 2;
-      index = s.indexOf('}}', lastIndex);
-      if (index < 0) {
-        var text = s.substring(lastIndex - 2);
-        if (result.length > 0 && result.last.isText) {
-          result.last.value += text;
-        } else {
-          result.add(new _BindingToken(text));
-        }
-        break;
-      }
-
-      var value = s.substring(lastIndex, index).trim();
-      result.add(new _BindingToken(value, isBinding: true));
-      lastIndex = index + 2;
-    }
-  }
-  return result;
-}
-
-void _addTemplateInstanceRecord(fragment, model) {
-  if (fragment.$dom_firstChild == null) {
-    return;
-  }
-
-  var instanceRecord = new TemplateInstance(
-      fragment.$dom_firstChild, fragment.$dom_lastChild, model);
-
-  var node = instanceRecord.firstNode;
-  while (node != null) {
-    node._templateInstance = instanceRecord;
-    node = node.nextNode;
-  }
-}
-
-void _removeAllBindingsRecursively(Node node) {
-  node.unbindAll();
-  for (var c = node.$dom_firstChild; c != null; c = c.nextNode) {
-    _removeAllBindingsRecursively(c);
-  }
-}
-
-void _removeTemplateChild(Node parent, Node child) {
-  child._templateInstance = null;
-  if (child is Element && child.isTemplate) {
-    // Make sure we stop observing when we remove an element.
-    var templateIterator = child._templateIterator;
-    if (templateIterator != null) {
-      templateIterator.abandon();
-      child._templateIterator = null;
-    }
-  }
-  child.remove();
-  _removeAllBindingsRecursively(child);
-}
-
-class _InstanceCursor {
-  final Element _template;
-  Node _terminator;
-  Node _previousTerminator;
-  int _previousIndex = -1;
-  int _index = 0;
-
-  _InstanceCursor(this._template, [index]) {
-    _terminator = _template;
-    if (index != null) {
-      while (index-- > 0) {
-        next();
-      }
-    }
-  }
-
-  void next() {
-    _previousTerminator = _terminator;
-    _previousIndex = _index;
-    _index++;
-
-    while (_index > _terminator._instanceTerminatorCount) {
-      _index -= _terminator._instanceTerminatorCount;
-      _terminator = _terminator.nextNode;
-      if (_terminator is Element && _terminator.tagName == 'TEMPLATE') {
-        _index += _instanceCount(_terminator);
-      }
-    }
-  }
-
-  void abandon() {
-    assert(_instanceCount(_template) > 0);
-    assert(_terminator._instanceTerminatorCount > 0);
-    assert(_index > 0);
-
-    _terminator._instanceTerminatorCount--;
-    _index--;
-  }
-
-  void insert(fragment) {
-    assert(_template.parentNode != null);
-
-    _previousTerminator = _terminator;
-    _previousIndex = _index;
-    _index++;
-
-    _terminator = fragment.$dom_lastChild;
-    if (_terminator == null) _terminator = _previousTerminator;
-    _template.parentNode.insertBefore(fragment, _previousTerminator.nextNode);
-
-    _terminator._instanceTerminatorCount++;
-    if (_terminator != _previousTerminator) {
-      while (_previousTerminator._instanceTerminatorCount >
-              _previousIndex) {
-        _previousTerminator._instanceTerminatorCount--;
-        _terminator._instanceTerminatorCount++;
-      }
-    }
-  }
-
-  void remove() {
-    assert(_previousIndex != -1);
-    assert(_previousTerminator != null &&
-           (_previousIndex > 0 || _previousTerminator == _template));
-    assert(_terminator != null && _index > 0);
-    assert(_template.parentNode != null);
-    assert(_instanceCount(_template) > 0);
-
-    if (_previousTerminator == _terminator) {
-      assert(_index == _previousIndex + 1);
-      _terminator._instanceTerminatorCount--;
-      _terminator = _template;
-      _previousTerminator = null;
-      _previousIndex = -1;
-      return;
-    }
-
-    _terminator._instanceTerminatorCount--;
-
-    var parent = _template.parentNode;
-    while (_previousTerminator.nextNode != _terminator) {
-      _removeTemplateChild(parent, _previousTerminator.nextNode);
-    }
-    _removeTemplateChild(parent, _terminator);
-
-    _terminator = _previousTerminator;
-    _index = _previousIndex;
-    _previousTerminator = null;
-    _previousIndex = -1;  // 0?
-  }
-}
-
-
-class _TemplateIterator {
-  final Element _templateElement;
-  int instanceCount = 0;
-  List iteratedValue;
-  bool observing = false;
-  final CompoundBinding inputs;
-
-  StreamSubscription _sub;
-  StreamSubscription _valueBinding;
-
-  _TemplateIterator(this._templateElement)
-    : inputs = new CompoundBinding(resolveInputs) {
-
-    _valueBinding = new PathObserver(inputs, 'value').bindSync(valueChanged);
-  }
-
-  static Object resolveInputs(Map values) {
-    if (values.containsKey('if') && !_templateBooleanConversion(values['if'])) {
-      return null;
-    }
-
-    if (values.containsKey('repeat')) {
-      return values['repeat'];
-    }
-
-    if (values.containsKey('bind')) {
-      return [values['bind']];
-    }
-
-    return null;
-  }
-
-  void valueChanged(value) {
-    clear();
-    if (value is! List) return;
-
-    iteratedValue = value;
-
-    if (value is Observable) {
-      _sub = value.changes.listen(_handleChanges);
-    }
-
-    int len = iteratedValue.length;
-    if (len > 0) {
-      _handleChanges([new ListChangeRecord(0, addedCount: len)]);
-    }
-  }
-
-  // TODO(jmesserly): port MDV v3.
-  getInstanceModel(model, syntax) => model;
-  getInstanceFragment(syntax) => _templateElement.createInstance();
-
-  void _handleChanges(List<ListChangeRecord> splices) {
-    var syntax = TemplateElement.syntax[_templateElement.attributes['syntax']];
-
-    for (var splice in splices) {
-      if (splice is! ListChangeRecord) continue;
-
-      for (int i = 0; i < splice.removedCount; i++) {
-        var cursor = new _InstanceCursor(_templateElement, splice.index + 1);
-        cursor.remove();
-        instanceCount--;
-      }
-
-      for (var addIndex = splice.index;
-          addIndex < splice.index + splice.addedCount;
-          addIndex++) {
-
-        var model = getInstanceModel(iteratedValue[addIndex], syntax);
-        var fragment = getInstanceFragment(syntax);
-
-        _addBindings(fragment, model, syntax);
-        _addTemplateInstanceRecord(fragment, model);
-
-        var cursor = new _InstanceCursor(_templateElement, addIndex);
-        cursor.insert(fragment);
-        instanceCount++;
-      }
-    }
-  }
-
-  void unobserve() {
-    if (_sub == null) return;
-    _sub.cancel();
-    _sub = null;
-  }
-
-  void clear() {
-    unobserve();
-
-    iteratedValue = null;
-    if (instanceCount == 0) return;
-
-    for (var i = 0; i < instanceCount; i++) {
-      var cursor = new _InstanceCursor(_templateElement, 1);
-      cursor.remove();
-    }
-
-    instanceCount = 0;
-  }
-
-  void abandon() {
-    unobserve();
-    _valueBinding.cancel();
-    inputs.dispose();
-  }
-}
-
-int _instanceCount(Element element) {
-  var templateIterator = element._templateIterator;
-  return templateIterator != null ? templateIterator.instanceCount : 0;
-}
 // 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.
@@ -26501,7 +25133,6 @@ _convertDartToNative_DateTime(DateTime date) {
 }
 
 WindowBase _convertNativeToDart_Window(win) {
-  if (win == null) return null;
   return _DOMWindowCrossFrame._createSafe(win);
 }