Function array_copyWithin

src/PyListProxyHandler.cc:447–540

}

static bool array_copyWithin(JSContext *cx, unsigned argc, JS::Value *vp) {
  JS::CallArgs args = JS::CallArgsFromVp(argc, vp);

  JS::RootedObject proxy(cx, JS::ToObject(cx, args.thisv()));
  if (!proxy) {
    return false;
  }
  PyObject *self = JS::GetMaybePtrFromReservedSlot<PyObject>(proxy, PyObjectSlot);

  int64_t selfLength = (uint64_t)PyList_GET_SIZE(self);

  unsigned int argsLength = args.length();

  int64_t relativeTarget;
  if (argsLength > 0) {
    if (!JS::ToInt64(cx, args.get(0), &relativeTarget)) {
      return false;
    }
  } else {
    relativeTarget = 0;
  }

  int64_t actualTarget;
  if (relativeTarget < 0) {
    actualTarget = int64_t(std::max(double(selfLength) + relativeTarget, 0.0));
  } else {
    actualTarget = int64_t(std::min(double(relativeTarget), double(selfLength)));
  }

  int64_t relativeStart;
  if (argsLength > 1) {
    if (!JS::ToInt64(cx, args.get(1), &relativeStart)) {
      return false;
    }
  } else {
    relativeStart = 0;
  }

  int64_t actualStart;
  if (relativeStart < 0) {
    actualStart = int64_t(std::max(double(selfLength) + relativeStart, 0.0));
  } else {
    actualStart = int64_t(std::min(double(relativeStart), double(selfLength)));
  }

  int64_t relativeEnd;
  if (argsLength > 2) {
    if (!JS::ToInt64(cx, args.get(2), &relativeEnd)) {
      return false;
    }
  } else {
    relativeEnd = selfLength;
  }

  int64_t actualEnd;
  if (relativeEnd < 0) {
    actualEnd = int64_t(std::max(double(selfLength) + relativeEnd, 0.0));
  } else {