Add observatory_pub_packages snapshot to third_party

observatory_pub_packages/template_binding/src/instance_binding_map.dart

Index: observatory_pub_packages/template_binding/src/instance_binding_map.dart
===================================================================
--- observatory_pub_packages/template_binding/src/instance_binding_map.dart	(revision 0)
+++ observatory_pub_packages/template_binding/src/instance_binding_map.dart	(working copy)
@@ -0,0 +1,87 @@
+// 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.
+
+part of template_binding;
+
+class _InstanceBindingMap {
+  final List bindings;
+  List<_InstanceBindingMap> children;
+  DocumentFragment content;
+
+  bool get isTemplate => false;
+
+  _InstanceBindingMap(this.bindings);
+
+  _InstanceBindingMap getChild(int index) {
+    if (children == null || index >= children.length) return null;
+    return children[index];
+  }
+}
+
+class _TemplateBindingMap extends _InstanceBindingMap {
+  bool get isTemplate => true;
+
+  MustacheTokens _if, _bind, _repeat;
+
+  _TemplateBindingMap(List bindings) : super(bindings);
+}
+
+_InstanceBindingMap _createInstanceBindingMap(Node node,
+    BindingDelegate delegate) {
+
+  _InstanceBindingMap map = _getBindings(node, delegate);
+  if (map == null) map = new _InstanceBindingMap([]);
+
+  List children = null;
+  int index = 0;
+  for (var c = node.firstChild; c != null; c = c.nextNode, index++) {
+    var childMap = _createInstanceBindingMap(c, delegate);
+    if (childMap == null) continue;
+
+    // TODO(jmesserly): use a sparse map instead?
+    if (children == null) children = new List(node.nodes.length);
+    children[index] = childMap;
+  }
+  map.children = children;
+
+  return map;
+}
+
+Node _cloneAndBindInstance(Node node, Node parent, Document stagingDocument,
+    _InstanceBindingMap bindings, model, BindingDelegate delegate,
+    List instanceBindings, [TemplateInstance instanceRecord]) {
+
+  var clone = parent.append(stagingDocument.importNode(node, false));
+
+  int i = 0;
+  for (var c = node.firstChild; c != null; c = c.nextNode, i++) {
+    var childMap = bindings != null ? bindings.getChild(i) : null;
+    _cloneAndBindInstance(c, clone, stagingDocument, childMap, model, delegate,
+        instanceBindings);
+  }
+
+  if (bindings.isTemplate) {
+    TemplateBindExtension.decorate(clone, node);
+    if (delegate != null) {
+      templateBindFallback(clone).bindingDelegate = delegate;
+    }
+  }
+
+  _processBindings(clone, bindings, model, instanceBindings);
+  return clone;
+}
+
+// TODO(rafaelw): Setup a MutationObserver on content which clears the expando
+// so that bindingMaps regenerate when template.content changes.
+_getInstanceBindingMap(DocumentFragment content, BindingDelegate delegate) {
+  if (delegate == null) delegate = BindingDelegate._DEFAULT;
+
+  if (delegate._bindingMaps == null) delegate._bindingMaps = new Expando();
+  var map = delegate._bindingMaps[content];
+  if (map == null) {
+    map = _createInstanceBindingMap(content, delegate);
+    delegate._bindingMaps[content] = map;
+  }
+  return map;
+}