execute<E> method

@override ListDiffs<E> execute<E>(ListDiffArguments<E> args)

Implementation

@override
ListDiffs<E> execute<E>(ListDiffArguments<E> args) {
  final List<E> oldList = args.original;
  final List<E> newList = args.replacement;

  if (identical(oldList, newList)) return ListDiffs<E>.empty(args);

  final oldSize = oldList.length;
  final newSize = newList.length;

  if (oldList.isEmpty && newList.isEmpty) return ListDiffs.empty(args);

  if (oldSize == 0) {
    return ListDiffs<E>.ofOperations(
        [InsertDiff(args, 0, newSize, newList)], args);
  }

  if (newSize == 0) {
    return ListDiffs<E>.ofOperations([DeleteDiff(args, 0, oldSize)], args);
  }

  final path = _buildPath(args, identityOnly);
  final diffs = _buildPatch(path, args)..sort();
  return ListDiffs<E>.ofOperations(
      diffs.reversed.toList(growable: false), args);
}