decode method

Object? decode(Object? value)

Restores a value previously produced by encode.

Implementation

Object? decode(Object? value) {
  if (value is List) return value.map(decode).toList(growable: false);
  if (value is Map) {
    final typed = Map<String, Object?>.from(value);
    final tag = typed[r'$type'];
    if (tag is String && typed.containsKey(r'$value')) {
      if (tag == 'Map') {
        final entries = typed[r'$value']! as List;
        return <String, Object?>{
          for (final entry in entries.cast<List>())
            entry[0]! as String: decode(entry[1]),
        };
      }
      final adapter = _byTag[tag];
      if (adapter == null) throw FormatException('Unknown type tag: $tag');
      return adapter.decode(decode(typed[r'$value']), this);
    }
    return typed.map((key, item) => MapEntry(key, decode(item)));
  }
  return value;
}