Source/bindings/v8/V8CustomElementCallback.cpp

/*
 * Copyright (C) 2013 Google Inc. All rights reserved.
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 * modification, are permitted provided that the following conditions are
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 *
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 * notice, this list of conditions and the following disclaimer.
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 * in the documentation and/or other materials provided with the
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 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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#include "config.h"
#include "bindings/v8/V8CustomElementCallback.h"

#include "V8Element.h"
#include "bindings/v8/ScriptController.h"
#include "bindings/v8/V8Binding.h"
#include "bindings/v8/V8HiddenPropertyName.h"
#include "core/dom/ScriptExecutionContext.h"
#include "wtf/PassRefPtr.h"

namespace WebCore {

PassRefPtr<V8CustomElementCallback> V8CustomElementCallback::create(ScriptExecutionContext* scriptExecutionContext, v8::Handle<v8::Object> owner, v8::Handle<v8::Function> ready)
{
    if (!ready.IsEmpty())
        owner->SetHiddenValue(V8HiddenPropertyName::customElementReady(), ready);
    return adoptRef(new V8CustomElementCallback(scriptExecutionContext, ready));
}

static void weakCallback(v8::Isolate*, v8::Persistent<v8::Function>*, ScopedPersistent<v8::Function>* handle)
{
    handle->clear();
}

V8CustomElementCallback::V8CustomElementCallback(ScriptExecutionContext* scriptExecutionContext, v8::Handle<v8::Function> ready)
    : CustomElementCallback(ready.IsEmpty() ? None : Ready)
    , ActiveDOMCallback(scriptExecutionContext)
    , m_world(DOMWrapperWorld::current())
    , m_ready(ready)
{
    if (!m_ready.isEmpty())
        m_ready.makeWeak(&m_ready, weakCallback);
}

void V8CustomElementCallback::ready(Element* element)
{
    if (!canInvokeCallback())
        return;

    v8::HandleScope handleScope;

    v8::Handle<v8::Context> context = toV8Context(scriptExecutionContext(), m_world.get());
    if (context.IsEmpty())
        return;

    v8::Context::Scope scope(context);
    v8::Isolate* isolate = context->GetIsolate();

    v8::Handle<v8::Function> callback = m_ready.newLocal(isolate);
    if (callback.IsEmpty())
        return;

    v8::Handle<v8::Value> elementHandle = toV8(element, context->Global(), isolate);
    if (elementHandle.IsEmpty()) {
        if (!isScriptControllerTerminating())
            CRASH();
        return;
    }

    ASSERT(elementHandle->IsObject());
    v8::Handle<v8::Object> receiver = v8::Handle<v8::Object>::Cast(elementHandle);

    v8::TryCatch exceptionCatcher;
    exceptionCatcher.SetVerbose(true);
    ScriptController::callFunctionWithInstrumentation(scriptExecutionContext(), callback, receiver, 0, 0);
}

} // namespace WebCore