Implement custom element construction and some 'define' checks

third_party/WebKit/Source/bindings/core/v8/custom/V8HTMLElementCustom.cpp

Index: third_party/WebKit/Source/bindings/core/v8/custom/V8HTMLElementCustom.cpp
diff --git a/third_party/WebKit/Source/bindings/core/v8/custom/V8HTMLElementCustom.cpp b/third_party/WebKit/Source/bindings/core/v8/custom/V8HTMLElementCustom.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..d8b5ad9e1741a200298b9a31d9db476d341f4d64
--- /dev/null
+++ b/third_party/WebKit/Source/bindings/core/v8/custom/V8HTMLElementCustom.cpp
@@ -0,0 +1,92 @@
+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "bindings/core/v8/V8HTMLElement.h"
+
+#include "bindings/core/v8/DOMWrapperWorld.h"
+#include "bindings/core/v8/ExceptionState.h"
+#include "bindings/core/v8/V8Binding.h"
+#include "bindings/core/v8/V8ThrowException.h"
+#include "core/dom/Document.h"
+#include "core/dom/custom/CustomElementDefinition.h"
+#include "core/dom/custom/CustomElementsRegistry.h"
+#include "core/frame/LocalDOMWindow.h"
+#include "platform/RuntimeEnabledFeatures.h"
+
+namespace blink {
+
+void V8HTMLElement::constructorCustom(
+    const v8::FunctionCallbackInfo<v8::Value>& info)
+{
+    ASSERT(info.IsConstructCall());
+
+    if (!RuntimeEnabledFeatures::customElementsV1Enabled()
+        || !DOMWrapperWorld::current(info.GetIsolate()).isMainWorld()) {
+        V8ThrowException::throwIllegalConstructorTypeError(info.GetIsolate());
+        return;
+    }
+    // FIXME(dominicc): Update this to match the specification when
+    // https://github.com/whatwg/html/issues/1154 is closed (if the
+    // behavior matches Image constructor, then just remove this
+    // FIXME.)
+
+    Document* document =
+        toDocument(currentExecutionContext(info.GetIsolate()));
+    v8::Local<v8::Context> context = info.GetIsolate()->GetCurrentContext();
+    CustomElementDefinition* def =
+        document->domWindow()->customElements()->definitionForConstructor(
+            context,
+            info.NewTarget());
+    if (!def) {
+        V8ThrowException::throwIllegalConstructorTypeError(info.GetIsolate());
+        return;
+    }
+
+    // TODO(dominicc): Implement cases where the definition's
+    // construction stack is not empty.
+    ExceptionState exceptionState(
+        ExceptionState::ConstructionContext,
+        "HTMLElement",
+        info.Holder(),
+        info.GetIsolate());
+    Element* element = document->createElement(
+        def->localName(),
+        AtomicString(),
+        exceptionState);
+    if (exceptionState.throwIfNeeded())
+        return;
+    // TODO(dominicc): The constructor invoked this way should
+    // allocate a wrapper; so use associateWithWrapper instead of
+    // allocating a new wrapper.
+    v8::Local<v8::Object> wrapper =
+        element->wrap(info.GetIsolate(), info.Holder());
+    info.GetReturnValue().Set(wrapper);
+    if (wrapper.IsEmpty())
+        return;
+
+    v8::Maybe<bool> couldSetPrototype =
+        wrapper->SetPrototype(context, def->prototype().v8Value());
+    if (couldSetPrototype.IsNothing())
+        return;
+    if (!couldSetPrototype.FromJust()) {
+        // TODO(dominicc): Does this happen in practice?
+        return;
+    }
+
+    // TODO(dominicc): This will be leaky, because the parser can be
+    // invoked any time. Write a test to ensure window shutdown does
+    // not leak.
+
+    // TODO(dominicc): Retrieve the window and CustomElementRegistry.
+    // TODO(dominicc): Use a v8::NativeWeakMap to store the ID of the object.
+    // - We can't use a hidden field, because the constructor could be any
+    //   ES6 constructor--we don't know ahead of time.
+    // - We can't use a symbol because the object could be frozen.
+
+    // TODO(dominicc): Add a test w/ calling the constructor cross-document.
+    // TODO(dominicc): Add a test that Custom Elements can not be registered
+    // from non-main worlds.
+}
+
+} // namespace blink