Function cmdmap_from_json

src/common/cmdparse.cc:319–417

 * false, ss is valid */

bool
cmdmap_from_json(const vector<string>& cmd, cmdmap_t *mapp, std::ostream& ss)
{
  json_spirit::mValue v;

  string fullcmd;
  // First, join all cmd strings
  for (auto& c : cmd)
    fullcmd += c;

  try {
    if (!json_spirit::read(fullcmd, v))
      throw std::runtime_error("unparseable JSON " + fullcmd);
    if (v.type() != json_spirit::obj_type)
      throw std::runtime_error("not JSON object " + fullcmd);

    // allocate new mObject (map) to return
    // make sure all contents are simple types (not arrays or objects)
    json_spirit::mObject o = v.get_obj();
    for (auto it = o.begin(); it != o.end(); ++it) {

      // ok, marshal it into our string->cmd_vartype map, or throw an
      // exception if it's not a simple datatype.  This is kind of
      // annoying, since json_spirit has a boost::variant inside it
      // already, but it's not public.  Oh well.

      switch (it->second.type()) {

      case json_spirit::obj_type:
      default:
	throw std::runtime_error("JSON array/object not allowed " + fullcmd);
        break;

      case json_spirit::array_type:
	{
	  // array is a vector of values.  Unpack it to a vector
	  // of strings, doubles, or int64_t, the only types we handle.
	  const vector<json_spirit::mValue>& spvals = it->second.get_array();
	  if (spvals.empty()) {
	    // if an empty array is acceptable, the caller should always check for
	    // vector<string> if the expected value of "vector<int64_t>" in the
	    // cmdmap is missing.
	    (*mapp)[it->first] = vector<string>();
	  } else if (spvals.front().type() == json_spirit::str_type) {
	    vector<string> outv;
	    for (const auto& sv : spvals) {
	      if (sv.type() != json_spirit::str_type) {
		throw std::runtime_error("Can't handle arrays of multiple types");
	      }
	      outv.push_back(sv.get_str());
	    }
	    (*mapp)[it->first] = std::move(outv);
	  } else if (spvals.front().type() == json_spirit::int_type) {
	    vector<int64_t> outv;
	    for (const auto& sv : spvals) {
	      if (spvals.front().type() != json_spirit::int_type) {
		throw std::runtime_error("Can't handle arrays of multiple types");
	      }