C++ js::HandleValue类代码示例

NS_IMETHODIMP nsAndroidBridge::HandleGeckoMessage(JS::HandleValue val,
        JSContext *cx)
{
    if (val.isObject()) {
        JS::RootedObject object(cx, &val.toObject());
        AndroidBridge::Bridge()->HandleGeckoMessage(cx, object);
        return NS_OK;
    }

    // Now handle legacy JSON messages.
    if (!val.isString()) {
        return NS_ERROR_INVALID_ARG;
    }
    JS::RootedString jsonStr(cx, val.toString());

    JS::RootedValue jsonVal(cx);
    if (!JS_ParseJSON(cx, jsonStr, &jsonVal) || !jsonVal.isObject()) {
        return NS_ERROR_INVALID_ARG;
    }

    // Spit out a warning before sending the message.
    nsContentUtils::ReportToConsoleNonLocalized(
        NS_LITERAL_STRING("Use of JSON is deprecated. "
                          "Please pass Javascript objects directly to handleGeckoMessage."),
        nsIScriptError::warningFlag,
        NS_LITERAL_CSTRING("nsIAndroidBridge"),
        nullptr);

    JS::RootedObject object(cx, &jsonVal.toObject());
    AndroidBridge::Bridge()->HandleGeckoMessage(cx, object);
    return NS_OK;
}

NS_IMETHODIMP
calDateTime::SetJsDate(JSContext* aCx, JS::HandleValue aDate)
{
    if (!aDate.isObject()) {
        mIsValid = false;
        return NS_OK;
    }

    JS::Rooted<JSObject*> dobj(aCx, &aDate.toObject());
    dobj = js::CheckedUnwrap(dobj);
    if (!dobj) {
        mIsValid = false;
        return NS_OK;
    }
    JSAutoCompartment ac(aCx, dobj);

    if (!JS_ObjectIsDate(aCx, dobj) || !js_DateIsValid(dobj)) {
        mIsValid = false;
        return NS_OK;
    }

    PRTime utcTime = PRTime(js_DateGetMsecSinceEpoch(dobj)) * 1000;
    mIsValid = NS_SUCCEEDED(SetNativeTime(utcTime));
    return NS_OK;
}

template<> bool ScriptInterface::FromJSVal<std::wstring>(JSContext* cx, JS::HandleValue v, std::wstring& out)
{
	JSAutoRequest rq(cx);
	WARN_IF_NOT(v.isString() || v.isNumber(), v); // allow implicit number conversions
	JS::RootedString str(cx, JS::ToString(cx, v));
	if (!str)
		FAIL("Argument must be convertible to a string");

	if (JS_StringHasLatin1Chars(str))
	{
		size_t length;
		JS::AutoCheckCannotGC nogc;
		const JS::Latin1Char* ch = JS_GetLatin1StringCharsAndLength(cx, nogc, str, &length);
		if (!ch)
			FAIL("JS_GetLatin1StringCharsAndLength failed");

		out.assign(ch, ch + length);
	}
	else
	{
		size_t length;
		JS::AutoCheckCannotGC nogc;
		const char16_t* ch = JS_GetTwoByteStringCharsAndLength(cx, nogc, str, &length);
		if (!ch)
			FAIL("JS_GetTwoByteStringsCharsAndLength failed"); // out of memory

		out.assign(ch, ch + length);
	}
	return true;
}

void CodeInfo::construct(JSContext* cx, JS::CallArgs args) {
    uassert(ErrorCodes::BadValue,
            "Code needs 0, 1 or 2 arguments",
            args.length() == 0 || args.length() == 1 || args.length() == 2);
    auto scope = getScope(cx);

    JS::RootedObject thisv(cx);

    scope->getProto<CodeInfo>().newObject(&thisv);
    ObjectWrapper o(cx, thisv);

    if (args.length() == 0) {
        o.setString(InternedString::code, "");
    } else if (args.length() == 1) {
        JS::HandleValue codeArg = args.get(0);
        if (!codeArg.isString())
            uasserted(ErrorCodes::BadValue, "code must be a string");

        o.setValue(InternedString::code, codeArg);
    } else {
        if (!args.get(0).isString())
            uasserted(ErrorCodes::BadValue, "code must be a string");
        if (!args.get(1).isObject())
            uasserted(ErrorCodes::BadValue, "scope must be an object");

        o.setValue(InternedString::code, args.get(0));
        o.setValue(InternedString::scope, args.get(1));
    }

    args.rval().setObjectOrNull(thisv);
}

 bool js_to_bool( JSContext *cx, JS::HandleValue vp, bool *ret ) {
     bool ok = vp.isBoolean();
     if (ok) {
         *ret = vp.toBoolean();
     }
     return ok;
 }

bool
JavaScriptShared::toVariant(JSContext *cx, JS::HandleValue from, JSVariant *to)
{
    switch (JS_TypeOfValue(cx, from)) {
      case JSTYPE_VOID:
        *to = UndefinedVariant();
        return true;

      case JSTYPE_OBJECT:
      case JSTYPE_FUNCTION:
      {
        RootedObject obj(cx, from.toObjectOrNull());
        if (!obj) {
            MOZ_ASSERT(from == JSVAL_NULL);
            *to = NullVariant();
            return true;
        }

        if (xpc_JSObjectIsID(cx, obj)) {
            JSIID iid;
            const nsID *id = xpc_JSObjectToID(cx, obj);
            ConvertID(*id, &iid);
            *to = iid;
            return true;
        }

        ObjectVariant objVar;
        if (!toObjectVariant(cx, obj, &objVar))
            return false;
        *to = objVar;
        return true;
      }

      case JSTYPE_STRING:
      {
        nsAutoJSString autoStr;
        if (!autoStr.init(cx, from))
            return false;
        *to = autoStr;
        return true;
      }

      case JSTYPE_NUMBER:
        if (from.isInt32())
            *to = double(from.toInt32());
        else
            *to = from.toDouble();
        return true;

      case JSTYPE_BOOLEAN:
        *to = from.toBoolean();
        return true;

      default:
        MOZ_ASSERT(false);
        return false;
    }
}

 bool js_to_number(JSContext *cx, JS::HandleValue v, double *dp) {
     if (v.isNumber()) {
         *dp = v.toNumber();
         return true;
     } else {
         *dp = 0;
         return false;
     }
 }

bool GetOVRStringVal(JSContext* cx, JS::HandleValue val, OVR::String* out) {
  if (!val.isString()) {
    JS_ReportError(cx, "Expected a string");
    return false;
  }
  JS::RootedString str(cx, val.toString());
  bool resp = GetOVRString(cx, str, out);
  return resp;
}

bool ScriptInterface::SetPrototype(JS::HandleValue objVal, JS::HandleValue protoVal)
{
	JSAutoRequest rq(m->m_cx);
	if (!objVal.isObject() || !protoVal.isObject())
		return false;
	JS::RootedObject obj(m->m_cx, &objVal.toObject());
	JS::RootedObject proto(m->m_cx, &protoVal.toObject());
	return JS_SetPrototype(m->m_cx, obj, proto);
}

bool ScriptInterface::EnumeratePropertyNamesWithPrefix(JS::HandleValue objVal, const char* prefix, std::vector<std::string>& out)
{
	JSAutoRequest rq(m->m_cx);
	
	if (!objVal.isObjectOrNull())
	{
		LOGERROR("EnumeratePropertyNamesWithPrefix expected object type!");
		return false;
	}
		
	if(objVal.isNull())
		return true; // reached the end of the prototype chain
	
	JS::RootedObject obj(m->m_cx, &objVal.toObject());
	JS::RootedObject it(m->m_cx, JS_NewPropertyIterator(m->m_cx, obj));
	if (!it)
		return false;

	while (true)
	{
		JS::RootedId idp(m->m_cx);
		JS::RootedValue val(m->m_cx);
		if (! JS_NextProperty(m->m_cx, it, idp.address()) || ! JS_IdToValue(m->m_cx, idp, &val))
			return false;

		if (val.isUndefined())
			break; // end of iteration
		if (!val.isString())
			continue; // ignore integer properties

		JS::RootedString name(m->m_cx, val.toString());
		size_t len = strlen(prefix)+1;
		std::vector<char> buf(len);
		size_t prefixLen = strlen(prefix) * sizeof(char);
		JS_EncodeStringToBuffer(m->m_cx, name, &buf[0], prefixLen);
		buf[len-1]= '\0';
		if(0 == strcmp(&buf[0], prefix))
		{
			size_t len;
			const jschar* chars = JS_GetStringCharsAndLength(m->m_cx, name, &len);
			out.push_back(std::string(chars, chars+len));
		}
	}

	// Recurse up the prototype chain
	JS::RootedObject prototype(m->m_cx);
	if (JS_GetPrototype(m->m_cx, obj, &prototype))
	{
		JS::RootedValue prototypeVal(m->m_cx, JS::ObjectOrNullValue(prototype));
		if (! EnumeratePropertyNamesWithPrefix(prototypeVal, prefix, out))
			return false;
	}

	return true;
}

bool ScriptInterface::GetProperty_(JS::HandleValue obj, const char* name, JS::MutableHandleValue out)
{
	JSAutoRequest rq(m->m_cx);
	if (!obj.isObject())
		return false;
	JS::RootedObject object(m->m_cx, &obj.toObject());
	
	if (!JS_GetProperty(m->m_cx, object, name, out))
		return false;
	return true;
}

void CStdDeserializer::ScriptObjectAppend(const char* name, JS::HandleValue objVal)
{
	JSContext* cx = m_ScriptInterface.GetContext();
	JSAutoRequest rq(cx);

	if (!objVal.isObject())
		throw PSERROR_Deserialize_ScriptError();

	JS::RootedObject obj(cx, &objVal.toObject());
	ReadScriptVal(name, obj);
}

bool ScriptInterface::GetPropertyInt_(JS::HandleValue obj, int name, JS::MutableHandleValue out)
{
	JSAutoRequest rq(m->m_cx);
	JS::RootedId nameId(m->m_cx, INT_TO_JSID(name));
	if (!obj.isObject())
		return false;
	JS::RootedObject object(m->m_cx, &obj.toObject());
	
	if (!JS_GetPropertyById(m->m_cx, object, nameId, out))
		return false;
	return true;
}

bool ScriptInterface::HasProperty(JS::HandleValue obj, const char* name)
{
	// TODO: proper errorhandling 
	JSAutoRequest rq(m->m_cx);
	if (!obj.isObject())
		return false;
	JS::RootedObject object(m->m_cx, &obj.toObject());

	bool found;
	if (!JS_HasProperty(m->m_cx, object, name, &found))
		return false;
	return found;
}

void ScriptInterface::CallConstructor(JS::HandleValue ctor, JS::HandleValueArray argv, JS::MutableHandleValue out)
{
	JSAutoRequest rq(m->m_cx);
	if (!ctor.isObject())
	{
		LOGERROR("CallConstructor: ctor is not an object");
		out.setNull();
		return;
	}

	JS::RootedObject ctorObj(m->m_cx, &ctor.toObject());
	out.setObjectOrNull(JS_New(m->m_cx, ctorObj, argv));
}