readMapOfMap method

Map<String, Map<String, Object>> readMapOfMap(Iterable<String> pathSegments)

Implementation

Map<String, Map<String, Object>> readMapOfMap(Iterable<String> pathSegments) {
  Object? data = options;

  for (final key in pathSegments) {
    if (data is Map<String, Object?> && data.containsKey(key)) {
      data = data[key];
    } else {
      return {};
    }
  }

  if (data is Iterable<Object>) {
    return Map.unmodifiable(Map<String, Map<String, Object>>.fromEntries([
      ...data.whereType<String>().map((node) => MapEntry(node, {})),
      ...data
          .whereType<Map<String, Object>>()
          .where((node) =>
              node.keys.length == 1 &&
              node.values.first is Map<String, Object>)
          .map((node) => MapEntry(
                node.keys.first,
                node.values.first as Map<String, Object>,
              )),
    ]));
  } else if (data is Map<String, Object>) {
    final rulesNode = data;

    return Map.unmodifiable(Map<String, Map<String, Object>>.fromEntries([
      ...rulesNode.entries
          .where((entry) => entry.value is bool && entry.value as bool)
          .map((entry) => MapEntry(entry.key, {})),
      ...rulesNode.keys.where((key) {
        final node = rulesNode[key];

        return node is Map<String, Object>;
      }).map((key) => MapEntry(key, rulesNode[key] as Map<String, Object>)),
    ]));
  }

  return {};
}