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template_binding/lib/src/instance_binding_map.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.
-
-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;
-}