Function mergeFromSeq2

src/JSObjectProxy.cc:478–546

private

// private
static int mergeFromSeq2(JSObjectProxy *self, PyObject *seq2) {
  PyObject *it;         /* iter(seq2) */
  Py_ssize_t i;         /* index into seq2 of current element */
  PyObject *item;       /* seq2[i] */
  PyObject *fast;       /* item as a 2-tuple or 2-list */

  it = PyObject_GetIter(seq2);
  if (it == NULL)
    return -1;

  for (i = 0;; ++i) {
    PyObject *key, *value;
    Py_ssize_t n;

    fast = NULL;
    item = PyIter_Next(it);
    if (item == NULL) {
      if (PyErr_Occurred())
        goto Fail;
      break;
    }

    /* Convert item to sequence, and verify length 2. */
    fast = PySequence_Fast(item, "");
    if (fast == NULL) {
      if (PyErr_ExceptionMatches(PyExc_TypeError))
        PyErr_Format(PyExc_TypeError,
          "cannot convert dictionary update "
          "sequence element #%zd to a sequence",
          i);
      goto Fail;
    }
    n = PySequence_Fast_GET_SIZE(fast);
    if (n != 2) {
      PyErr_Format(PyExc_ValueError,
        "dictionary update sequence element #%zd "
        "has length %zd; 2 is required",
        i, n);
      goto Fail;
    }

    /* Update/merge with this (key, value) pair. */
    key = PySequence_Fast_GET_ITEM(fast, 0);
    value = PySequence_Fast_GET_ITEM(fast, 1);
    Py_INCREF(key);
    Py_INCREF(value);

    if (JSObjectProxyMethodDefinitions::JSObjectProxy_assign(self, key, value) < 0) {
      Py_DECREF(key);
      Py_DECREF(value);
      goto Fail;
    }

    Py_DECREF(key);
    Py_DECREF(value);
    Py_DECREF(fast);
    Py_DECREF(item);
  }