You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: expand.m
    path of file: ./repos/bspm/thirdparty/spm12/matlabbatch/@cfg_branch
    
    the code of the file until where you have to start completion: function [item, sts] = expand(item, eflag, tropts)

% function [item, sts] = expand(item, eflag, tropts)
% Set/query expanded flag of item depending on eflag:
% -1 - do not force eflag to any state, only child state will be inherited
%  0 - collapse
%  1 - expand val unconditionally
%  2 - expand metadata unconditionally
%  3 - expand val, if it is not set
% Return status is (expanded > 0), i.e. if expanded, then no additional
% info about expansion level or expansion reason is returned and parent
% nodes a
    
function is identical for all cfg_intree classes.
%
% This code is part of a batch job configuration system for MATLAB. See
%      help matlabbatch
% for a general overview.
%_______________________________________________________________________
% Copyright (C) 2007 Freiburg Brain Imaging

% Volkmar Glauche
% $Id: expand.m 5678 2013-10-11 14:58:04Z volkmar $

rev = '$Rev: 5678 $'; %#ok

% Set expanded based on eflag in item
if eflag >= 0 && eflag <= 2
    item.cfg_item.expanded = eflag;
end;
if eflag == 3
    if ~all_set_item(item)
        item.cfg_item.expanded = eflag;
    else
        item.cfg_item.expanded = 0;
    end;
end;
sts = item.cfg_item.expanded > 0;

% Check whether to proceed with forcing eflags
if eflag >= 0 && (tropts.clvl >= tropts.mlvl || (~isempty(tropts.stopspec) && match(item, tropts.stopspec)))
    eflag = -1;
end;

tname = treepart(item, tropts.dflag);
ntgt_input = substruct('.', tname);
citems = subsref(item, ntgt_input);

tropts.clvl = tropts.clvl + 1;

for k = 1:numel(citems)
    [citems{k}, sts1] = expand(citems{k}, eflag, tropts);
    sts = sts || sts1;
end