PyObject* NodeProxy::getAttr(std::string name)
{
Datum* datum = node->getDatum(QString::fromStdString(name));
if (!datum)
throw proxy::ProxyException("Nonexistent datum lookup.");
// If we have a known caller, then mark that this datum is an upstream node
// for the caller.
if (caller)
{
// Try to connect this datum as an upstream datum of the caller
if (!caller->connectUpstream(datum))
throw proxy::ProxyException("Recursive loop in lookup.");
// Also connect the node's name as an upstream datum
// (since if the name changes, the expression may become invalid)
Q_ASSERT(dynamic_cast<Node*>(datum->parent()));
Node* n = static_cast<Node*>(datum->parent());
auto name = n->getDatum("__name");
Q_ASSERT(name);
caller->connectUpstream(name);
}
if (!datum->getValid())
throw proxy::ProxyException("Invalid datum lookup.");
PyObject* value = datum->getValue();
Py_INCREF(value);
return value;
}
