## Copyright (C) 2008, 2009 David Bateman

 ##

 ## This file is part of Octave.

 ##

 ## Octave is free software; you can redistribute it and/or modify it

 ## under the terms of the GNU General Public License as published by

 ## the Free Software Foundation; either version 3 of the License, or (at

 ## your option) any later version.

 ##

 ## Octave is distributed in the hope that it will be useful, but

 ## WITHOUT ANY WARRANTY; without even the implied warranty of

 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

 ## General Public License for more details.

 ##

 ## You should have received a copy of the GNU General Public License

 ## along with Octave; see the file COPYING.  If not, see

 ## <http://www.gnu.org/licenses/>.

 ## -*- texinfo -*-

 ## @deftypefn {Function File} {@var{newargs} =} __add_datasource__ (@var{fcn}, @var{h}, @var{data}, @var{varargin})

 ## Undocumented internal function.

 ## @end deftypefn

 function newargs = __add_datasource__ (fcn, h, data, varargin)

   if (nargin < 3)

     error ("internal error");

   endif

   if (ischar (data))

     data = {data};

   endif

   for i = 1 : numel (data)

     addproperty (strcat (data{i}, "datasource"), h, "string", "");

   endfor

   i = 0;

   newargs = {};

   while (i < numel (varargin))

     arg = varargin{++i};

     if (i != numel(varargin) && ischar (arg)

 	&& length (arg) > 9 && strcmpi (arg(end-9:end), "datasource"))

       arg = tolower (arg);

       val = varargin{++i};

       if (ischar (val))

 	set (h, arg, val);

       else

 	error ("%s: expecting data source to be a string", fcn);

       endif

     else

       newargs{end + 1} = arg;

     endif

   endwhile

 endfunction