Method JSObjectProxy_repr

src/JSObjectProxy.cc:345–475

}

PyObject *JSObjectProxyMethodDefinitions::JSObjectProxy_repr(JSObjectProxy *self) {
  // Detect cyclic objects
  PyObject *objPtr = PyLong_FromVoidPtr(self->jsObject->get());
  // For `Py_ReprEnter`, we must get a same PyObject when visiting the same JSObject.
  // We cannot simply use the object returned by `PyLong_FromVoidPtr` because it won't reuse the PyLongObjects for ints not between -5 and 256.
  // Instead, we store this PyLongObject in a global dict, using itself as the hashable key, effectively interning the PyLongObject.
  PyObject *tsDict = PyThreadState_GetDict();
  PyObject *cyclicKey = PyDict_SetDefault(tsDict, /*key*/ objPtr, /*value*/ objPtr); // cyclicKey = (tsDict[objPtr] ??= objPtr)
  int i = Py_ReprEnter(cyclicKey);
  if (i != 0) {
    return i > 0 ? PyUnicode_FromString("{...}") : NULL;
  }

  Py_ssize_t selfLength = JSObjectProxy_length(self);

  if (selfLength == 0) {
    Py_ReprLeave(cyclicKey);
    PyDict_DelItem(tsDict, cyclicKey);
    return PyUnicode_FromString("{}");
  }

  _PyUnicodeWriter writer;

  _PyUnicodeWriter_Init(&writer);

  writer.overallocate = 1;
  /* "{" + "1: 2" + ", 3: 4" * (len - 1) + "}" */
  writer.min_length = 1 + 4 + (2 + 4) * (selfLength - 1) + 1;

  PyObject *key = NULL, *value = NULL;

  JS::RootedIdVector props(GLOBAL_CX);

  if (_PyUnicodeWriter_WriteChar(&writer, '{') < 0) {
    goto error;
  }

  /* Do repr() on each key+value pair, and insert ": " between them. Note that repr may mutate the dict. */

  // Get **enumerable** own properties
  if (!js::GetPropertyKeys(GLOBAL_CX, *(self->jsObject), JSITER_OWNONLY, &props)) {
    return NULL;
  }

  for (Py_ssize_t index = 0; index < selfLength; index++) {
    if (index > 0) {
      if (_PyUnicodeWriter_WriteASCIIString(&writer, ", ", 2) < 0) {
        goto error;
      }
    }

    JS::HandleId id = props[index];
    key = idToKey(GLOBAL_CX, id);

    // escape infinite recur on superclass reference
    if (strcmp(PyUnicode_AsUTF8(key), "$super") == 0) {
      continue;
    }