## Copyright (C) 2000 Paul Kienzle
##
## 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

## isequal(x1, x2, ...)
##    true if all parts of x1, x2, ... are equal

function t = isequal(x,varargin)
  if nargin != 2
    usage("isequal(x,y,...)");
  endif

  for arg = 1:length(varargin)
    y = varargin{arg};
    if isstruct(x)
      t = isstruct (y);
      for [v, k] = x
        t = t && struct_contains (y, k) && isequal (getfield(x,k), getfield(y,k));
      endfor
      for [v,k] = y
        t = t && struct_contains (x, k);
      endfor
    elseif islist(x)
      t = islist(y) && length(x) == length(y);
      if !t, return; endif
      for i = 1:length(x)
	t = isequal (x{i}, y{i});
	if !t, return; endif
      endfor
    elseif any (size (x) != size (y))
      t = false;
    elseif iscell(x) || islist(x)
      t = iscell (y) || islist(y);
      if !t, return; endif
      x = x (:);
      y = y (:);
      for i = 1:length(x)
	t = isequal (x{i}, y{i});
	if !t, return; endif
      endfor
    else
      t = all (x (:) == y (:));
    endif
    if !t, return; endif
  endfor
endfunction