C++ Value::isNull方法代码示例

bool
GetSendMmsMessageRequestFromParams(uint32_t aServiceId,
                                   const JS::Value& aParam,
                                   SendMmsMessageRequest& request) {
  if (aParam.isUndefined() || aParam.isNull() || !aParam.isObject()) {
    return false;
  }

  mozilla::AutoJSContext cx;
  JS::Rooted<JS::Value> param(cx, aParam);
  RootedDictionary<MmsParameters> params(cx);
  if (!params.Init(cx, param)) {
    return false;
  }

  // SendMobileMessageRequest.receivers
  if (!params.mReceivers.WasPassed()) {
    return false;
  }
  request.receivers().AppendElements(params.mReceivers.Value());

  // SendMobileMessageRequest.attachments
  mozilla::dom::ContentChild* cc = mozilla::dom::ContentChild::GetSingleton();

  if (!params.mAttachments.WasPassed()) {
    return false;
  }

  for (uint32_t i = 0; i < params.mAttachments.Value().Length(); i++) {
    mozilla::dom::MmsAttachment& attachment = params.mAttachments.Value()[i];
    MmsAttachmentData mmsAttachment;
    mmsAttachment.id().Assign(attachment.mId);
    mmsAttachment.location().Assign(attachment.mLocation);
    mmsAttachment.contentChild() = cc->GetOrCreateActorForBlob(attachment.mContent);
    if (!mmsAttachment.contentChild()) {
      return false;
    }
    request.attachments().AppendElement(mmsAttachment);
  }

  request.smil() = params.mSmil;
  request.subject() = params.mSubject;

  // Set service ID.
  request.serviceId() = aServiceId;

  return true;
}

std::string
gjs_debug_value(JS::Value v)
{
    std::ostringstream out;
    if (v.isNull())
        return "null";
    if (v.isUndefined())
        return "undefined";
    if (v.isInt32()) {
        out << v.toInt32();
        return out.str();
    }
    if (v.isDouble()) {
        out << v.toDouble();
        return out.str();
    }
    if (v.isString()) {
        out << gjs_debug_string(v.toString());
        return out.str();
    }
    if (v.isSymbol()) {
        out << gjs_debug_symbol(v.toSymbol());
        return out.str();
    }
    if (v.isObject() && js::IsFunctionObject(&v.toObject())) {
        JSFunction* fun = JS_GetObjectFunction(&v.toObject());
        JSString *display_name = JS_GetFunctionDisplayId(fun);
        if (display_name)
            out << "<function " << gjs_debug_string(display_name);
        else
            out << "<unnamed function";
        out << " at " << fun << '>';
        return out.str();
    }
    if (v.isObject()) {
        out << gjs_debug_object(&v.toObject());
        return out.str();
    }
    if (v.isBoolean())
        return (v.toBoolean() ? "true" : "false");
    if (v.isMagic())
        return "<magic>";
    return "unexpected value";
}

static nsQueryInterface
JSvalToInterface(JSContext* cx, JS::Value val, nsIXPConnect* xpc, bool* wasNull)
{
  if (val.isNull()) {
    *wasNull = true;
    return nsQueryInterface(nsnull);
  }
  
  *wasNull = false;
  if (val.isObject()) {
    JSObject* arg = &val.toObject();

    nsCOMPtr<nsIXPConnectWrappedNative> native;
    xpc->GetWrappedNativeOfJSObject(cx, arg, getter_AddRefs(native));

    // do_QueryWrappedNative is not null-safe
    if (native) {
      return do_QueryWrappedNative(native);
    }
  }
  
  return nsQueryInterface(nsnull);
}

NS_IMETHODIMP
TCPSocketParent::SendCallback(const nsAString& aType, const JS::Value& aDataVal,
                              const nsAString& aReadyState, uint32_t aBuffered,
                              JSContext* aCx)
{
  if (!mIPCOpen) {
    NS_WARNING("Dropping callback due to no IPC connection");
    return NS_OK;
  }

  CallbackData data;
  if (aDataVal.isString()) {
    JSString* jsstr = aDataVal.toString();
    nsDependentJSString str;
    if (!str.init(aCx, jsstr)) {
      FireInteralError(this, __LINE__);
      return NS_ERROR_OUT_OF_MEMORY;
    }
    data = SendableData(str);

  } else if (aDataVal.isUndefined() || aDataVal.isNull()) {
    data = mozilla::void_t();

  } else if (aDataVal.isObject()) {
    JSObject* obj = &aDataVal.toObject();
    if (JS_IsArrayBufferObject(obj)) {
      uint32_t nbytes = JS_GetArrayBufferByteLength(obj);
      uint8_t* buffer = JS_GetArrayBufferData(obj);
      if (!buffer) {
        FireInteralError(this, __LINE__);
        return NS_ERROR_OUT_OF_MEMORY;
      }
      FallibleTArray<uint8_t> fallibleArr;
      if (!fallibleArr.InsertElementsAt(0, buffer, nbytes)) {
        FireInteralError(this, __LINE__);
        return NS_ERROR_OUT_OF_MEMORY;
      }
      InfallibleTArray<uint8_t> arr;
      arr.SwapElements(fallibleArr);
      data = SendableData(arr);

    } else {
      nsDependentJSString name;

      JS::Rooted<JS::Value> val(aCx);
      if (!JS_GetProperty(aCx, obj, "name", val.address())) {
        NS_ERROR("No name property on supposed error object");
      } else if (JSVAL_IS_STRING(val)) {
        if (!name.init(aCx, JSVAL_TO_STRING(val))) {
          NS_WARNING("couldn't initialize string");
        }
      }

      data = TCPError(name);
    }
  } else {
    NS_ERROR("Unexpected JS value encountered");
    FireInteralError(this, __LINE__);
    return NS_ERROR_FAILURE;
  }
  mozilla::unused <<
      PTCPSocketParent::SendCallback(nsString(aType), data,
                                     nsString(aReadyState), aBuffered);
  return NS_OK;
}

NS_IMETHODIMP
TCPSocketParent::SendCallback(const nsAString& aType, const JS::Value& aDataVal,
                              const nsAString& aReadyState, uint32_t aBuffered,
                              JSContext* aCx)
{
  if (!mIPCOpen) {
    NS_WARNING("Dropping callback due to no IPC connection");
    return NS_OK;
  }

  CallbackData data;
  if (aDataVal.isString()) {
    JSString* jsstr = aDataVal.toString();
    nsDependentJSString str;
    if (!str.init(aCx, jsstr)) {
      FireInteralError(this, __LINE__);
      return NS_ERROR_OUT_OF_MEMORY;
    }
    data = str;

  } else if (aDataVal.isUndefined() || aDataVal.isNull()) {
    data = mozilla::void_t();

  } else if (aDataVal.isObject()) {
    JSObject* obj = &aDataVal.toObject();
    if (JS_IsTypedArrayObject(obj)) {
      NS_ENSURE_TRUE(JS_IsUint8Array(obj), NS_ERROR_FAILURE);
      uint32_t nbytes = JS_GetTypedArrayByteLength(obj);
      uint8_t* buffer = JS_GetUint8ArrayData(obj);
      if (!buffer) {
        FireInteralError(this, __LINE__);
        return NS_ERROR_OUT_OF_MEMORY;
      }
      FallibleTArray<uint8_t> fallibleArr;
      if (!fallibleArr.InsertElementsAt(0, buffer, nbytes)) {
        FireInteralError(this, __LINE__);
        return NS_ERROR_OUT_OF_MEMORY;
      }
      InfallibleTArray<uint8_t> arr;
      arr.SwapElements(fallibleArr);
      data = SendableData(arr);

    } else {
      nsDependentJSString message, filename;
      uint32_t lineNumber = 0;
      uint32_t columnNumber = 0;

      jsval val;
      if (!JS_GetProperty(aCx, obj, "message", &val)) {
        NS_ERROR("No message property on supposed error object");
      } else if (JSVAL_IS_STRING(val)) {
        if (!message.init(aCx, JSVAL_TO_STRING(val))) {
          NS_WARNING("couldn't initialize string");
        }
      }

      if (!JS_GetProperty(aCx, obj, "fileName", &val)) {
        NS_ERROR("No fileName property on supposed error object");
      } else if (JSVAL_IS_STRING(val)) {
        if (!filename.init(aCx, JSVAL_TO_STRING(val))) {
          NS_WARNING("couldn't initialize string");
        }
      }

      if (!JS_GetProperty(aCx, obj, "lineNumber", &val)) {
        NS_ERROR("No lineNumber property on supposed error object");
      } else if (JSVAL_IS_INT(val)) {
        lineNumber = JSVAL_TO_INT(val);
      }

      if (!JS_GetProperty(aCx, obj, "columnNumber", &val)) {
        NS_ERROR("No columnNumber property on supposed error object");
      } else if (JSVAL_IS_INT(val)) {
        columnNumber = JSVAL_TO_INT(val);
      }

      data = JSError(message, filename, lineNumber, columnNumber);
    }
  } else {
    NS_ERROR("Unexpected JS value encountered");
    FireInteralError(this, __LINE__);
    return NS_ERROR_FAILURE;
  }
  mozilla::unused <<
      PTCPSocketParent::SendCallback(nsString(aType), data,
                                     nsString(aReadyState), aBuffered);
  return NS_OK;
}