Index: tools/dom/src/dartium_CustomElementSupport.dart |
diff --git a/tools/dom/src/dartium_CustomElementSupport.dart b/tools/dom/src/dartium_CustomElementSupport.dart |
new file mode 100644 |
index 0000000000000000000000000000000000000000..a70ea5ed46eb13b7556a4e07ada74e9a9a457949 |
--- /dev/null |
+++ b/tools/dom/src/dartium_CustomElementSupport.dart |
@@ -0,0 +1,88 @@ |
+// Copyright (c) 2014, 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 dart.dom.html; |
+ |
+/// Dartium ElementUpgrader implementation. |
+class _VMElementUpgrader implements ElementUpgrader { |
+ final Type _type; |
+ final Type _nativeType; |
+ |
+ _VMElementUpgrader(Document document, Type type, String extendsTag) : |
+ _type = type, |
+ _nativeType = _validateCustomType(type).reflectedType { |
+ |
+ if (extendsTag == null) { |
+ if (_nativeType != HtmlElement) { |
+ throw new UnsupportedError('Class must provide extendsTag if base ' |
+ 'native class is not HtmlElement'); |
+ } |
+ } else { |
+ if (document.createElement(extendsTag).runtimeType != _nativeType) { |
+ throw new UnsupportedError( |
+ 'extendsTag does not match base native class'); |
+ } |
+ } |
+ } |
+ |
+ Element upgrade(Element element) { |
+ if (element.runtimeType != _nativeType) { |
+ throw new UnsupportedError('Element is incorrect type'); |
+ } |
+ return _Utils.changeElementWrapper(element, _type); |
+ return null; |
+ } |
+} |
+ |
+/// Validates that the custom type is properly formed- |
+/// |
+/// * Is a user-defined class. |
+/// * Has a created constructor with zero args. |
+/// * Derives from an Element subclass. |
+/// |
+/// Then returns the native base class. |
+ClassMirror _validateCustomType(Type type) { |
+ // TODO(vsm): Move these checks into native code. |
+ ClassMirror cls = reflectClass(type); |
+ if (_isBuiltinType(cls)) { |
+ throw new UnsupportedError("Invalid custom element from ${(cls.owner as LibraryMirror).uri}."); |
+ } |
+ var className = MirrorSystem.getName(cls.simpleName); |
+ var createdConstructor = cls.declarations[new Symbol('$className.created')]; |
+ if (createdConstructor == null || |
+ createdConstructor is! MethodMirror || |
+ !createdConstructor.isConstructor) { |
+ throw new UnsupportedError( |
+ 'Class is missing constructor $className.created'); |
+ } |
+ |
+ if (createdConstructor.parameters.length > 0) { |
+ throw new UnsupportedError( |
+ 'Constructor $className.created must take zero arguments'); |
+ } |
+ |
+ Symbol objectName = reflectClass(Object).qualifiedName; |
+ bool isRoot(ClassMirror cls) => |
+ cls == null || cls.qualifiedName == objectName; |
+ Symbol elementName = reflectClass(HtmlElement).qualifiedName; |
+ bool isElement(ClassMirror cls) => |
+ cls != null && cls.qualifiedName == elementName; |
+ ClassMirror superClass = cls.superclass; |
+ ClassMirror nativeClass = _isBuiltinType(superClass) ? superClass : null; |
+ while(!isRoot(superClass) && !isElement(superClass)) { |
+ superClass = superClass.superclass; |
+ if (nativeClass == null && _isBuiltinType(superClass)) { |
+ nativeClass = superClass; |
+ } |
+ } |
+ return nativeClass; |
+} |
+ |
+ |
+bool _isBuiltinType(ClassMirror cls) { |
+ // TODO(vsm): Find a less hackish way to do this. |
+ LibraryMirror lib = cls.owner; |
+ String libName = lib.uri.toString(); |
+ return libName.startsWith('dart:'); |
+} |