C++ WebCore::toV8Context方法代码示例

bool _NPN_SetProperty(NPP npp, NPObject* npObject, NPIdentifier propertyName, const NPVariant* value)
{
    if (!npObject)
        return false;

    if (npObject->_class == npScriptObjectClass) {
        V8NPObject* object = reinterpret_cast<V8NPObject*>(npObject);

        v8::HandleScope handleScope;
        v8::Handle<v8::Context> context = toV8Context(npp, npObject);
        if (context.IsEmpty())
            return false;

        v8::Context::Scope scope(context);

        v8::Handle<v8::Object> obj(object->v8Object);
        obj->Set(npIdentifierToV8Identifier(propertyName),
                 convertNPVariantToV8Object(value, object->rootObject->frame()->script()->windowScriptNPObject()));
        return true;
    }

    if (npObject->_class->setProperty)
        return npObject->_class->setProperty(npObject, propertyName, value);

    return false;
}

bool _NPN_GetProperty(NPP npp, NPObject* npObject, NPIdentifier propertyName, NPVariant* result)
{
    if (!npObject)
        return false;

    if (npObject->_class == npScriptObjectClass) {
        V8NPObject* object = reinterpret_cast<V8NPObject*>(npObject);

        v8::HandleScope handleScope;
        v8::Handle<v8::Context> context = toV8Context(npp, npObject);
        if (context.IsEmpty())
            return false;

        v8::Context::Scope scope(context);

        v8::Handle<v8::Object> obj(object->v8Object);
        v8::Local<v8::Value> v8result = obj->Get(npIdentifierToV8Identifier(propertyName));

        convertV8ObjectToNPVariant(v8result, npObject, result);
        return true;
    }

    if (npObject->_class->hasProperty && npObject->_class->getProperty) {
        if (npObject->_class->hasProperty(npObject, propertyName))
            return npObject->_class->getProperty(npObject, propertyName, result);
    }

    VOID_TO_NPVARIANT(*result);
    return false;
}

bool _NPN_EvaluateHelper(NPP npp, bool popupsAllowed, NPObject* npObject, NPString* npScript, NPVariant* result)
{
    VOID_TO_NPVARIANT(*result);
    if (!npObject)
        return false;

    if (npObject->_class != npScriptObjectClass)
        return false;

    v8::HandleScope handleScope;
    v8::Handle<v8::Context> context = toV8Context(npp, npObject);
    if (context.IsEmpty())
        return false;

    V8Proxy* proxy = toV8Proxy(npObject);
    ASSERT(proxy);

    v8::Context::Scope scope(context);

    WebCore::String filename;
    if (!popupsAllowed)
        filename = "npscript";

    WebCore::String script = WebCore::String::fromUTF8(npScript->UTF8Characters, npScript->UTF8Length);
    v8::Local<v8::Value> v8result = proxy->evaluate(WebCore::ScriptSourceCode(script, WebCore::KURL(WebCore::ParsedURLString, filename)), 0);

    if (v8result.IsEmpty())
        return false;

    convertV8ObjectToNPVariant(v8result, npObject, result);
    return true;
}

bool _NPN_Enumerate(NPP npp, NPObject* npObject, NPIdentifier** identifier, uint32_t* count)
{
    if (!npObject)
        return false;

    if (npObject->_class == npScriptObjectClass) {
        V8NPObject* object = reinterpret_cast<V8NPObject*>(npObject);

        v8::HandleScope handleScope;
        v8::Handle<v8::Context> context = toV8Context(npp, npObject);
        if (context.IsEmpty())
            return false;
        v8::Context::Scope scope(context);

        v8::Handle<v8::Object> obj(object->v8Object);

        // FIXME: http://b/issue?id=1210340: Use a v8::Object::Keys() method when it exists, instead of evaluating javascript.

        // FIXME: Figure out how to cache this helper function.  Run a helper function that collects the properties
        // on the object into an array.
        const char enumeratorCode[] =
            "(function (obj) {"
            "  var props = [];"
            "  for (var prop in obj) {"
            "    props[props.length] = prop;"
            "  }"
            "  return props;"
            "});";
        v8::Handle<v8::String> source = v8::String::New(enumeratorCode);
        v8::Handle<v8::Script> script = v8::Script::Compile(source, 0);
        v8::Handle<v8::Value> enumeratorObj = script->Run();
        v8::Handle<v8::Function> enumerator = v8::Handle<v8::Function>::Cast(enumeratorObj);
        v8::Handle<v8::Value> argv[] = { obj };
#if PLATFORM(ANDROID)
// TODO(benm): implement an arry size function on android
        v8::Local<v8::Value> propsObj = enumerator->Call(v8::Handle<v8::Object>::Cast(enumeratorObj), 1, argv);
#else
        v8::Local<v8::Value> propsObj = enumerator->Call(v8::Handle<v8::Object>::Cast(enumeratorObj), ARRAYSIZE_UNSAFE(argv), argv);
#endif
        if (propsObj.IsEmpty())
            return false;

        // Convert the results into an array of NPIdentifiers.
        v8::Handle<v8::Array> props = v8::Handle<v8::Array>::Cast(propsObj);
        *count = props->Length();
        *identifier = static_cast<NPIdentifier*>(malloc(sizeof(NPIdentifier*) * *count));
        for (uint32_t i = 0; i < *count; ++i) {
            v8::Local<v8::Value> name = props->Get(v8::Integer::New(i));
            (*identifier)[i] = getStringIdentifier(v8::Local<v8::String>::Cast(name));
        }
        return true;
    }

    if (NP_CLASS_STRUCT_VERSION_HAS_ENUM(npObject->_class) && npObject->_class->enumerate)
       return npObject->_class->enumerate(npObject, identifier, count);

    return false;
}

void _NPN_SetException(NPObject* npObject, const NPUTF8 *message)
{
    if (npObject->_class != npScriptObjectClass) {
        // We won't be able to find a proper scope for this exception, so just throw it.
        // This is consistent with JSC, which throws a global exception all the time.
        V8Proxy::throwError(V8Proxy::GeneralError, message);
        return;
    }
    v8::HandleScope handleScope;
    v8::Handle<v8::Context> context = toV8Context(0, npObject);
    if (context.IsEmpty())
        return;

    v8::Context::Scope scope(context);
    V8Proxy::throwError(V8Proxy::GeneralError, message);
}

// FIXME: Fix it same as _NPN_Invoke (HandleScope and such).
bool _NPN_InvokeDefault(NPP npp, NPObject* npObject, const NPVariant* arguments, uint32_t argumentCount, NPVariant* result)
{
    if (!npObject)
        return false;

    if (npObject->_class != npScriptObjectClass) {
        if (npObject->_class->invokeDefault)
            return npObject->_class->invokeDefault(npObject, arguments, argumentCount, result);

        VOID_TO_NPVARIANT(*result);
        return true;
    }

    V8NPObject* v8NpObject = reinterpret_cast<V8NPObject*>(npObject);

    VOID_TO_NPVARIANT(*result);

    v8::HandleScope handleScope;
    v8::Handle<v8::Context> context = toV8Context(npp, npObject);
    if (context.IsEmpty())
        return false;

    v8::Context::Scope scope(context);

    // Lookup the function object and call it.
    v8::Handle<v8::Object> functionObject(v8NpObject->v8Object);
    if (!functionObject->IsFunction())
        return false;

    v8::Local<v8::Value> resultObject;
    v8::Handle<v8::Function> function(v8::Function::Cast(*functionObject));
    if (!function->IsNull()) {
        V8Proxy* proxy = toV8Proxy(npObject);
        ASSERT(proxy);

        OwnArrayPtr<v8::Handle<v8::Value> > argv(createValueListFromVariantArgs(arguments, argumentCount, npObject));
        resultObject = proxy->callFunction(function, functionObject, argumentCount, argv.get());
    }
    // If we had an error, return false.  The spec is a little unclear here, but says "Returns true if the method was
    // successfully invoked".  If we get an error return value, was that successfully invoked?
    if (resultObject.IsEmpty())
        return false;

    convertV8ObjectToNPVariant(resultObject, npObject, result);
    return true;
}

bool _NPN_Construct(NPP npp, NPObject* npObject, const NPVariant* arguments, uint32_t argumentCount, NPVariant* result)
{
    if (!npObject)
        return false;

    if (npObject->_class == npScriptObjectClass) {
        V8NPObject* object = reinterpret_cast<V8NPObject*>(npObject);

        v8::HandleScope handleScope;
        v8::Handle<v8::Context> context = toV8Context(npp, npObject);
        if (context.IsEmpty())
            return false;
        v8::Context::Scope scope(context);

        // Lookup the constructor function.
        v8::Handle<v8::Object> ctorObj(object->v8Object);
        if (!ctorObj->IsFunction())
            return false;

        // Call the constructor.
        v8::Local<v8::Value> resultObject;
        v8::Handle<v8::Function> ctor(v8::Function::Cast(*ctorObj));
        if (!ctor->IsNull()) {
            V8Proxy* proxy = toV8Proxy(npObject);
            ASSERT(proxy);

            OwnArrayPtr<v8::Handle<v8::Value> > argv(createValueListFromVariantArgs(arguments, argumentCount, npObject));
            resultObject = proxy->newInstance(ctor, argumentCount, argv.get());
        }

        if (resultObject.IsEmpty())
            return false;

        convertV8ObjectToNPVariant(resultObject, npObject, result);
        return true;
    }

    if (NP_CLASS_STRUCT_VERSION_HAS_CTOR(npObject->_class) && npObject->_class->construct)
        return npObject->_class->construct(npObject, arguments, argumentCount, result);

    return false;
}

bool _NPN_RemoveProperty(NPP npp, NPObject* npObject, NPIdentifier propertyName)
{
    if (!npObject)
        return false;
    if (npObject->_class != npScriptObjectClass)
        return false;

    V8NPObject* object = reinterpret_cast<V8NPObject*>(npObject);

    v8::HandleScope handleScope;
    v8::Handle<v8::Context> context = toV8Context(npp, npObject);
    if (context.IsEmpty())
        return false;
    v8::Context::Scope scope(context);

    v8::Handle<v8::Object> obj(object->v8Object);
    // FIXME: Verify that setting to undefined is right.
    obj->Set(npIdentifierToV8Identifier(propertyName), v8::Undefined());
    return true;
}

void _NPN_SetException(NPObject* npObject, const NPUTF8 *message)
{
    if (!npObject || npObject->_class != npScriptObjectClass) {
        // We won't be able to find a proper scope for this exception, so just throw it.
        // This is consistent with JSC, which throws a global exception all the time.
#if PLATFORM(ANDROID)
        // However, if there isn't a v8 context, throw the error away as there really isn't anything useful to do with it.
        if (v8::Context::InContext())
            V8Proxy::throwError(V8Proxy::GeneralError, message);
#endif
        return;
    }
    v8::HandleScope handleScope;
    v8::Handle<v8::Context> context = toV8Context(0, npObject);
    if (context.IsEmpty())
        return;

    v8::Context::Scope scope(context);
    V8Proxy::throwError(V8Proxy::GeneralError, message);
}

bool _NPN_HasProperty(NPP npp, NPObject* npObject, NPIdentifier propertyName)
{
    if (!npObject)
        return false;

    if (npObject->_class == npScriptObjectClass) {
        V8NPObject* object = reinterpret_cast<V8NPObject*>(npObject);

        v8::HandleScope handleScope;
        v8::Handle<v8::Context> context = toV8Context(npp, npObject);
        if (context.IsEmpty())
            return false;
        v8::Context::Scope scope(context);

        v8::Handle<v8::Object> obj(object->v8Object);
        return obj->Has(npIdentifierToV8Identifier(propertyName));
    }

    if (npObject->_class->hasProperty)
        return npObject->_class->hasProperty(npObject, propertyName);
    return false;
}

bool _NPN_HasMethod(NPP npp, NPObject* npObject, NPIdentifier methodName)
{
    if (!npObject)
        return false;

    if (npObject->_class == npScriptObjectClass) {
        V8NPObject* object = reinterpret_cast<V8NPObject*>(npObject);

        v8::HandleScope handleScope;
        v8::Handle<v8::Context> context = toV8Context(npp, npObject);
        if (context.IsEmpty())
            return false;
        v8::Context::Scope scope(context);

        v8::Handle<v8::Object> obj(object->v8Object);
        v8::Handle<v8::Value> prop = obj->Get(npIdentifierToV8Identifier(methodName));
        return prop->IsFunction();
    }

    if (npObject->_class->hasMethod)
        return npObject->_class->hasMethod(npObject, methodName);
    return false;
}

bool _NPN_Invoke(NPP npp, NPObject* npObject, NPIdentifier methodName, const NPVariant* arguments, uint32_t argumentCount, NPVariant* result)
{
    if (!npObject)
        return false;

    if (npObject->_class != npScriptObjectClass) {
        if (npObject->_class->invoke)
            return npObject->_class->invoke(npObject, methodName, arguments, argumentCount, result);

        VOID_TO_NPVARIANT(*result);
        return true;
    }

    V8NPObject* v8NpObject = reinterpret_cast<V8NPObject*>(npObject);

    PrivateIdentifier* identifier = static_cast<PrivateIdentifier*>(methodName);
    if (!identifier->isString)
        return false;

    v8::HandleScope handleScope;
    // FIXME: should use the plugin's owner frame as the security context.
    v8::Handle<v8::Context> context = toV8Context(npp, npObject);
    if (context.IsEmpty())
        return false;

    v8::Context::Scope scope(context);

    if (methodName == _NPN_GetStringIdentifier("eval")) {
        if (argumentCount != 1)
            return false;
        if (arguments[0].type != NPVariantType_String)
            return false;
        return _NPN_Evaluate(npp, npObject, const_cast<NPString*>(&arguments[0].value.stringValue), result);
    }

    v8::Handle<v8::Value> functionObject = v8NpObject->v8Object->Get(v8::String::New(identifier->value.string));
    if (functionObject.IsEmpty() || functionObject->IsNull()) {
        NULL_TO_NPVARIANT(*result);
        return false;
    }
    if (functionObject->IsUndefined()) {
        VOID_TO_NPVARIANT(*result);
        return false;
    }

    V8Proxy* proxy = toV8Proxy(npObject);
    ASSERT(proxy);

    // Call the function object.
    v8::Handle<v8::Function> function = v8::Handle<v8::Function>::Cast(functionObject);
    OwnArrayPtr<v8::Handle<v8::Value> > argv(createValueListFromVariantArgs(arguments, argumentCount, npObject));
    v8::Local<v8::Value> resultObject = proxy->callFunction(function, v8NpObject->v8Object, argumentCount, argv.get());

    // If we had an error, return false.  The spec is a little unclear here, but says "Returns true if the method was
    // successfully invoked".  If we get an error return value, was that successfully invoked?
    if (resultObject.IsEmpty())
        return false;

    convertV8ObjectToNPVariant(resultObject, npObject, result);
    return true;
}