## Copyright (C) 2000  Etienne Grossmann
##
## This program 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 2 of the License, or
## (at your option) any later version.
##
## This program 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 this program; if not, write to the Free Software
## Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

## -*- texinfo -*-
## @deftypefn {Built-in Function} {} [@var{v1},...] =
## @code{getfield (@var{s}, 'k1',...)} extract fields from a structure.
## For example
##
## @example
## @group
## ss(1,2).fd(3).b=5;
## getfield(ss,@{1,2@},'fd',@{3@},'b')
## @result{} ans = 5
## @end group
## @end example
##
## Note that this function is deprecated in favour of 'dynamic
## fields'. So the previous could be written
##
## @example
##          i1= @{1,2@}; i2= 'fd'; i3= @{3@}; i4= 'b';
##          ss( i1@{:@} ).( i2 )( i3@{:@} ).( i4 )
## @end example
## @end deftypefn
## @seealso{setfield,getfields,rmfield,isfield,isstruct,fields,cmpstruct,struct}

## Author: Etienne Grossmann <etienne@cs.uky.edu>

## $Id: getfield.m,v 1.10 2005/11/04 22:12:04 pkienzle Exp $

function v= getfield( obj, varargin )
   field= field_access( varargin{1:nargin-1} );
   v= eval(field);

function str= field_access( varargin )
   str= 'obj';
   for i=1:nargin
      v= varargin{i};
      if iscell( v )
          sep= '(';
          for j=1:length(v)
	      str= sprintf("%s%s%s", str, sep, num2str(v{j}));
              sep= ',';
          end
	  str= sprintf("%s)", str);
      else
          str= sprintf("%s.%s",str,v);
      end
   end

# if we know if dynamic field names are supported, then
#   function s=mygetfield(s,varargin)
#   for idx= 1:nargin-1
#      i=varargin{idx};
#      if iscell(i)
#         s= s( i{:} );
#      else
#         s= s.( i );
#      end
#   end

%!test
%! x.a = "hello";
%! assert(getfield(x,"a"),"hello");