computeOperation method

@override MapEntry? computeOperation(Object? json)

Implementation

@override
MapEntry? computeOperation(Object? json) {
  if (json == null) return MapEntry(null, null);

  if (json is MapEntry) {
    return json;
  } else if (json is Pair) {
    return json.asMapEntry;
  } else if (json is List) {
    if (json.isEmpty) {
      return null;
    } else if (json.length == 1) {
      return MapEntry(json[0], null);
    } else {
      return MapEntry(json[0], json[1]);
    }
  } else if (json is Map) {
    if (json.isEmpty) {
      return null;
    } else {
      var keyName = getParameter(0);
      var valName = getParameter(1);

      if (keyName == null || valName == null) {
        var keys = json.keys.toList();

        if (keyName != null) {
          keys.remove(keyName);
        }

        if (valName != null) {
          keys.remove(valName);
        }

        keyName ??= keys.removeAt(0);
        valName ??= keys.removeAt(0);
      }

      var key = _resolveMapValue(json, keyName);
      var val = _resolveMapValue(json, valName);

      return MapEntry(key, val);
    }
  } else {
    return MapEntry('/', json);
  }
}