Method defineProperty

src/PyListProxyHandler.cc:2102–2136

}

bool PyListProxyHandler::defineProperty(
  JSContext *cx, JS::HandleObject proxy, JS::HandleId id,
  JS::Handle<JS::PropertyDescriptor> desc, JS::ObjectOpResult &result
) const {
  Py_ssize_t index;
  if (!idToIndex(cx, id, &index)) { // not an int-like property key
    return result.failBadIndex();
  }

  if (desc.isAccessorDescriptor()) { // containing getter/setter
    return result.failNotDataDescriptor();
  }
  if (!desc.hasValue()) {
    return result.failInvalidDescriptor();
  }

  JS::RootedValue itemV(cx, desc.value());
  PyObject *item = pyTypeFactory(cx, itemV);
  PyObject *self = JS::GetMaybePtrFromReservedSlot<PyObject>(proxy, PyObjectSlot);
  if (PyList_SetItem(self, index, item) < 0) {
    // we are out-of-bounds and need to expand
    Py_ssize_t len = PyList_GET_SIZE(self);
    // fill the space until the inserted index
    for (Py_ssize_t i = len; i < index; i++) {
      PyList_Append(self, Py_None);
    }

    PyList_Append(self, item);

    // clear pending exception
    PyErr_Clear();
  }

  return result.succeed();
}

bool PyListProxyHandler::ownPropertyKeys(JSContext *cx, JS::HandleObject proxy, JS::MutableHandleIdVector props) const {
  // Modified from https://hg.mozilla.org/releases/mozilla-esr102/file/3b574e1/dom/base/RemoteOuterWindowProxy.cpp#l137