function [bonds,components] = rbg2abg(name,rbonds,rstrokes,rcomponents,port_coord,port_name,infofile)

% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %% Version control history
% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %% $Id$
% %% $Log$
% %% Revision 1.28  1998/07/02 12:36:05  peterg
% %% Removed debugging lines
% %%
% %% Revision 1.27  1998/07/02 12:24:02  peterg
% %% Expand port aliases
% %%
% %% Revision 1.26  1998/04/16 14:07:51  peterg
% %% Sorted out [] problem with vector ports -- new octave function
% %% split_port
% %%

    

  % which end of bond at component?
  bond_end = index(:,2); 
  direction = -sign(bond_end-1.5*one);
  signed_bond_list = bond_list.*direction;
  components = add_bond(components,signed_bond_list',i);
  
  # Unalias all the ports on this component - if not a junction
  unlabelled_ports = 0;  
  in_bonds = 0;
  if ((comp_type!="0")&&(comp_type!="1"))
    eval( ["alias = ", comp_type, '_alias';]); # Get aliases
    if is_struct(alias)		# are there any aliases
      for j=1:n_comp_bonds
      	port_name_index = getindex(port_bond,signed_bond_list(j));
        port_direction = -sign(signed_bond_list(j));

      	if port_name_index==0	# There is no port on this bond - so try
				# to default
	  unlabelled_ports++;
	  if(unlabelled_ports==1)
	    if port_direction>0
	      in_bonds++;
	      port_name_i = "in";
	    else
	      port_name_i = "out";
	    end;
	  elseif (unlabelled_ports==2)
	    if port_direction>0
	      if (++in_bonds>1)
	      	mtt_info(["More than one unlabelled in port on component " \
			  comp_name " (" comp_type ")"],fnum);
	      else
	      port_name_i = "in";
	      end
	    else
	      port_name_i = "out";
	    end;
	  else
	      mtt_info(["More than two unlabelled ports on component " \
			comp_name " (" comp_type ")"],fnum);
          end
	  mtt_info(["Defaulting to port name " port_name_i " on component " \
		    comp_name " (" comp_type ")" ],fnum);
	  port_name = [port_name; ["[" port_name_i "]"]];	# add to list
	  [port_name_index,junk] = size(port_name); # the corresponding index
        else  
      	  port_name_i = deblank(port_name(port_name_index,:));
	  port_name_i = port_name_i(2:length(port_name_i)-1) # strip []
	end;
        if struct_contains(alias,port_name_i) # Is this an alias?
	  eval(["new_port_name_i = alias.",port_name_i]);
	  mtt_info(["Expanding port name " port_name_i " of component " \
		    comp_name " (" comp_type ") to ", new_port_name_i],fnum);
	  port_name = replace_name(port_name, \
				   ["[",new_port_name_i,"]"], port_name_index);

      	end
      end
    end
  end;

end;

components

% Deduce causality from the strokes (if any) and create the list of bonds
causality = zeros(n_bonds,2);
if n_strokes>0