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: setupVoc.m
    path of file: ./repos/robotic_perception/Trafic_Sign_Recognition/code/vlfeat-0.9.20-bin/vlfeat-0.9.20/apps/recognition
    
    the code of the file until where you have to start completion: function imdb = setupVoc(datasetDir, varargin)
% SETUPVOC    Setup PASCAL VOC data
%   IMDB = SETUPVOC(DATASETDIR, 'EDITION', '2007') setups the
%   PASCAL VOC 2007 data. This is similar to SETUPGENERIC(), but adapted
%   to the peculiarities of this dataset. In particular, the
%   difficult image flag and the fact that multiple labels apply to
%   each image are supported.
%
%   Note that only the PASCAL VOC 2007 data comes with test images
%   and labels. For the other editions, setting up the test images
%   cannot be automatized due to restrictions in the distribution.
%
%   See also: SETUPGENERIC().

% Author: Andrea Vedaldi

% Copyright (C) 2013 Andrea Vedaldi
% All rights reserved.
%
% This file is part of the VLFeat library and is made available under
% the terms of the BSD license (see the COPYING file).

opts.edition = '2007' ;
opts.autoDownload = true ;
opts.lite = false ;
opts = vl_argparse(opts, varargin) ;

switch opts.edition
  case '2007'
    urls = {'http://pascallin.ecs.soton.ac.uk/challenges/VOC/voc2007/VOCtrainval_06-Nov-2007.tar', ...
            'http://pascallin.ecs.soton.ac.uk/challenges/VOC/voc2007/VOCtest_06-Nov-2007.tar'} ;
  case '2008'
    urls = {'http://pascallin.ecs.soton.ac.uk/challenges/VOC/voc2008/VOCtrainval_14-Jul-2008.tar'} ;
  case '2009'

    
function imdb = setupVoc(datasetDir, varargin)
% SETUPVOC    Setup PASCAL VOC data
%   IMDB = SETUPVOC(DATASETDIR, 'EDITION', '2007') setups the
%   PASCAL VOC 2007 data. This is similar to SETUPGENERIC(), but adapted
%   to the peculiarities of this dataset. In particular, the
%   difficult image flag and the fact that multiple labels apply to
%   each image are supported.
%
%   Note that only the PASCAL VOC 2007 data comes with test images
%   and labels. For the other editions, setting up the test images
%   cannot be automatized due to restrictions in the distribution.
%
%   See also: SETUPGENERIC().

% Author: Andrea Vedaldi

% Copyright (C) 2013 Andrea Vedaldi
% All rights reserved.
%
% This file is part of the VLFeat library and is made available under
% the terms of the BSD license (see the COPYING file).

opts.edition = '2007' ;
opts.autoDownload = true ;
opts.lite = false ;
opts = vl_argparse(opts, varargin) ;

switch opts.edition
  case '2007'
    urls = {'http://pascallin.ecs.soton.ac.uk/challenges/VOC/voc2007/VOCtrainval_06-Nov-2007.tar', ...
            'http://pascallin.ecs.soton.ac.uk/challenges/VOC/voc2007/VOCtest_06-Nov-2007.tar'} ;
  case '2008'
    urls = {'http://pascallin.ecs.soton.ac.uk/challenges/VOC/voc2008/VOCtrainval_14-Jul-2008.tar'} ;
  case '2009'
    urls = {'http://pascallin.ecs.soton.ac.uk/challenges/VOC/voc2009/VOCtrainval_11-May-2009.tar'} ;
  case '2010'
    urls = {'http://pascallin.ecs.soton.ac.uk/challenges/VOC/voc2010/VOCtrainval_03-May-2010.tar'} ;
  case '2011'
    urls = {'http://pascallin.ecs.soton.ac.uk/challenges/VOC/voc2011/VOCtrainval_25-May-2011.tar'} ;
  case '2012'
    urls = {'http://pascallin.ecs.soton.ac.uk/challenges/VOC/voc2012/VOCtrainval_11-May-2012.tar'} ;
  otherwise
    error('Unknown PASCAL VOC edition ''%s''.', opts.edition) ;
end