Frame.parseVM constructor Null safety

Implementation

factory Frame.parseVM(String frame) => _catchFormatException(frame, () {
      // The VM sometimes folds multiple stack frames together and replaces
      // them with "...".
      if (frame == '...') {
        return Frame(Uri(), null, null, '...');
      }

      var match = _vmFrame.firstMatch(frame);
      if (match == null) return UnparsedFrame(frame);

      // Get the pieces out of the regexp match. Function, URI and line should
      // always be found. The column is optional.
      var member = match[1]!
          .replaceAll(_asyncBody, '<async>')
          .replaceAll('<anonymous closure>', '<fn>');
      var uri = match[2]!.startsWith('<data:')
          ? Uri.dataFromString('')
          : Uri.parse(match[2]!);

      var lineAndColumn = match[3]!.split(':');
      var line =
          lineAndColumn.length > 1 ? int.parse(lineAndColumn[1]) : null;
      var column =
          lineAndColumn.length > 2 ? int.parse(lineAndColumn[2]) : null;
      return Frame(uri, line, column, member);
    });