WebCore/bindings/v8/NPV8Object.cpp - platform/external/webkit - Git at Google

 /*
  * Copyright (C) 2004, 2006 Apple Computer, Inc.  All rights reserved.
  * Copyright (C) 2007, 2008, 2009 Google, Inc.  All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
  *    documentation and/or other materials provided with the distribution.
  *
  * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */

 #include "config.h"

 #include "NPV8Object.h"

 #include "PlatformBridge.h"
 #include "DOMWindow.h"
 #include "Frame.h"
 #include "OwnArrayPtr.h"
 #include "PlatformString.h"
 #include "ScriptController.h"
 #include "V8CustomBinding.h"
 #include "V8GCController.h"
 #include "V8Helpers.h"
 #include "V8NPUtils.h"
 #include "V8Proxy.h"
 #include "npruntime_impl.h"
 #include "npruntime_priv.h"

 #include <stdio.h>
 #include <v8.h>
 #include <wtf/StringExtras.h>

 using WebCore::toV8Context;
 using WebCore::toV8Proxy;
 using WebCore::V8ClassIndex;
 using WebCore::V8Custom;
 using WebCore::V8DOMWrapper;
 using WebCore::V8GCController;
 using WebCore::V8Proxy;

 // FIXME: Comments on why use malloc and free.
 static NPObject* allocV8NPObject(NPP, NPClass*)
 {
     return static_cast<NPObject*>(malloc(sizeof(V8NPObject)));
 }

 static void freeV8NPObject(NPObject* npObject)
 {
     V8NPObject* v8NpObject = reinterpret_cast<V8NPObject*>(npObject);
 #ifndef NDEBUG
     V8GCController::unregisterGlobalHandle(v8NpObject, v8NpObject->v8Object);
 #endif
     v8NpObject->v8Object.Dispose();
     free(v8NpObject);
 }

 static v8::Handle<v8::Value>* createValueListFromVariantArgs(const NPVariant* arguments, uint32_t argumentCount, NPObject* owner)
 {
     v8::Handle<v8::Value>* argv = new v8::Handle<v8::Value>[argumentCount];
     for (uint32_t index = 0; index < argumentCount; index++) {
         const NPVariant* arg = &arguments[index];
         argv[index] = convertNPVariantToV8Object(arg, owner);
     }
     return argv;
 }

 // Create an identifier (null terminated utf8 char*) from the NPIdentifier.
 static v8::Local<v8::String> npIdentifierToV8Identifier(NPIdentifier name)
 {
     PrivateIdentifier* identifier = static_cast<PrivateIdentifier*>(name);
     if (identifier->isString)
         return v8::String::New(static_cast<const char*>(identifier->value.string));

     char buffer[32];
     snprintf(buffer, sizeof(buffer), "%d", identifier->value.number);
     return v8::String::New(buffer);
 }

 static NPClass V8NPObjectClass = { NP_CLASS_STRUCT_VERSION,
                                    allocV8NPObject,
                                    freeV8NPObject,
                                    0, 0, 0, 0, 0, 0, 0, 0, 0 };

 // NPAPI's npruntime functions.
 NPClass* npScriptObjectClass = &V8NPObjectClass;

 NPObject* npCreateV8ScriptObject(NPP npp, v8::Handle<v8::Object> object, WebCore::DOMWindow* root)
 {
     // Check to see if this object is already wrapped.
     if (object->InternalFieldCount() == V8Custom::kNPObjectInternalFieldCount) {
         v8::Local<v8::Value> typeIndex = object->GetInternalField(V8Custom::kDOMWrapperTypeIndex);
         if (typeIndex->IsNumber() && typeIndex->Uint32Value() == V8ClassIndex::NPOBJECT) {

             NPObject* returnValue = V8DOMWrapper::convertToNativeObject<NPObject>(V8ClassIndex::NPOBJECT, object);
             _NPN_RetainObject(returnValue);
             return returnValue;
         }
     }

     V8NPObject* v8npObject = reinterpret_cast<V8NPObject*>(_NPN_CreateObject(npp, &V8NPObjectClass));
     v8npObject->v8Object = v8::Persistent<v8::Object>::New(object);
 #ifndef NDEBUG
     V8GCController::registerGlobalHandle(WebCore::NPOBJECT, v8npObject, v8npObject->v8Object);
 #endif
     v8npObject->rootObject = root;
     return reinterpret_cast<NPObject*>(v8npObject);
 }

 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;
 }

 // 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_Evaluate(NPP npp, NPObject* npObject, NPString* npScript, NPVariant* result)
 {
     bool popupsAllowed = WebCore::PlatformBridge::popupsAllowed(npp);
     return _NPN_EvaluateHelper(npp, popupsAllowed, npObject, npScript, result);
 }

 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_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_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_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;
 }

 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;
 }

 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.
         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);
 }

 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 };
         v8::Local<v8::Value> propsObj = enumerator->Call(v8::Handle<v8::Object>::Cast(enumeratorObj), ARRAYSIZE_UNSAFE(argv), argv);
         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;
 }

 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;
 }
	/*
	* Copyright (C) 2004, 2006 Apple Computer, Inc. All rights reserved.
	* Copyright (C) 2007, 2008, 2009 Google, Inc. All rights reserved.
	*
	* Redistribution and use in source and binary forms, with or without
	* modification, are permitted provided that the following conditions
	* are met:
	* 1. Redistributions of source code must retain the above copyright
	* notice, this list of conditions and the following disclaimer.
	* 2. Redistributions in binary form must reproduce the above copyright
	* notice, this list of conditions and the following disclaimer in the
	* documentation and/or other materials provided with the distribution.
	*
	* THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
	* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
	* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR
	* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
	* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
	* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
	* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
	* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
	* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	*/

	#include "config.h"

	#include "NPV8Object.h"

	#include "PlatformBridge.h"
	#include "DOMWindow.h"
	#include "Frame.h"
	#include "OwnArrayPtr.h"
	#include "PlatformString.h"
	#include "ScriptController.h"
	#include "V8CustomBinding.h"
	#include "V8GCController.h"
	#include "V8Helpers.h"
	#include "V8NPUtils.h"
	#include "V8Proxy.h"
	#include "npruntime_impl.h"
	#include "npruntime_priv.h"

	#include <stdio.h>
	#include <v8.h>
	#include <wtf/StringExtras.h>

	using WebCore::toV8Context;
	using WebCore::toV8Proxy;
	using WebCore::V8ClassIndex;
	using WebCore::V8Custom;
	using WebCore::V8DOMWrapper;
	using WebCore::V8GCController;
	using WebCore::V8Proxy;

	// FIXME: Comments on why use malloc and free.
	static NPObject* allocV8NPObject(NPP, NPClass*)
	{
	return static_cast<NPObject*>(malloc(sizeof(V8NPObject)));
	}

	static void freeV8NPObject(NPObject* npObject)
	{
	V8NPObject* v8NpObject = reinterpret_cast<V8NPObject*>(npObject);
	#ifndef NDEBUG
	V8GCController::unregisterGlobalHandle(v8NpObject, v8NpObject->v8Object);
	#endif
	v8NpObject->v8Object.Dispose();
	free(v8NpObject);
	}

	static v8::Handle<v8::Value>* createValueListFromVariantArgs(const NPVariant* arguments, uint32_t argumentCount, NPObject* owner)
	{
	v8::Handle<v8::Value>* argv = new v8::Handle<v8::Value>[argumentCount];
	for (uint32_t index = 0; index < argumentCount; index++) {
	const NPVariant* arg = &arguments[index];
	argv[index] = convertNPVariantToV8Object(arg, owner);
	}
	return argv;
	}

	// Create an identifier (null terminated utf8 char*) from the NPIdentifier.
	static v8::Local<v8::String> npIdentifierToV8Identifier(NPIdentifier name)
	{
	PrivateIdentifier* identifier = static_cast<PrivateIdentifier*>(name);
	if (identifier->isString)
	return v8::String::New(static_cast<const char*>(identifier->value.string));

	char buffer[32];
	snprintf(buffer, sizeof(buffer), "%d", identifier->value.number);
	return v8::String::New(buffer);
	}

	static NPClass V8NPObjectClass = { NP_CLASS_STRUCT_VERSION,
	allocV8NPObject,
	freeV8NPObject,
	0, 0, 0, 0, 0, 0, 0, 0, 0 };

	// NPAPI's npruntime functions.
	NPClass* npScriptObjectClass = &V8NPObjectClass;

	NPObject* npCreateV8ScriptObject(NPP npp, v8::Handle<v8::Object> object, WebCore::DOMWindow* root)
	{
	// Check to see if this object is already wrapped.
	if (object->InternalFieldCount() == V8Custom::kNPObjectInternalFieldCount) {
	v8::Local<v8::Value> typeIndex = object->GetInternalField(V8Custom::kDOMWrapperTypeIndex);
	if (typeIndex->IsNumber() && typeIndex->Uint32Value() == V8ClassIndex::NPOBJECT) {

	NPObject* returnValue = V8DOMWrapper::convertToNativeObject<NPObject>(V8ClassIndex::NPOBJECT, object);
	_NPN_RetainObject(returnValue);
	return returnValue;
	}
	}

	V8NPObject* v8npObject = reinterpret_cast<V8NPObject*>(_NPN_CreateObject(npp, &V8NPObjectClass));
	v8npObject->v8Object = v8::Persistent<v8::Object>::New(object);
	#ifndef NDEBUG
	V8GCController::registerGlobalHandle(WebCore::NPOBJECT, v8npObject, v8npObject->v8Object);
	#endif
	v8npObject->rootObject = root;
	return reinterpret_cast<NPObject*>(v8npObject);
	}

	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;
	}

	// 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_Evaluate(NPP npp, NPObject* npObject, NPString* npScript, NPVariant* result)
	{
	bool popupsAllowed = WebCore::PlatformBridge::popupsAllowed(npp);
	return _NPN_EvaluateHelper(npp, popupsAllowed, npObject, npScript, result);
	}

	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_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_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_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;
	}

	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;
	}

	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.
	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);
	}

	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 };
	v8::Local<v8::Value> propsObj = enumerator->Call(v8::Handle<v8::Object>::Cast(enumeratorObj), ARRAYSIZE_UNSAFE(argv), argv);
	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;
	}

	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;
	}