Method JSArrayProxy_inplace_repeat

src/JSArrayProxy.cc:728–759

}

PyObject *JSArrayProxyMethodDefinitions::JSArrayProxy_inplace_repeat(JSArrayProxy *self, Py_ssize_t n) {
  Py_ssize_t input_size = JSArrayProxy_length(self);
  if (input_size == 0 || n == 1) {
    Py_INCREF(self);
    return (PyObject *)self;
  }

  if (n < 1) {
    JSArrayProxy_clear_method(self);
    Py_INCREF(self);
    return (PyObject *)self;
  }

  if (input_size > PY_SSIZE_T_MAX / n) {
    return PyErr_NoMemory();
  }

  JS::SetArrayLength(GLOBAL_CX, *(self->jsArray), input_size * n);

  // repeat within self
  // one might think of using copyWithin but in SpiderMonkey it's implemented in JS!
  JS::RootedValue elementVal(GLOBAL_CX);
  for (Py_ssize_t inputIdx = 0; inputIdx < input_size; inputIdx++) {
    JS_GetElement(GLOBAL_CX, *(self->jsArray), inputIdx, &elementVal);
    for (Py_ssize_t repeatIdx = 0; repeatIdx < n; repeatIdx++) {
      JS_SetElement(GLOBAL_CX, *(self->jsArray), repeatIdx * input_size + inputIdx, elementVal);
    }
  }

  Py_INCREF(self);
  return (PyObject *)self;
}

PyObject *JSArrayProxyMethodDefinitions::JSArrayProxy_clear_method(JSArrayProxy *self) {
  JS::SetArrayLength(GLOBAL_CX, *(self->jsArray), 0);