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

% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %% Version control history
% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% %% $Id$
% %% $Log$
% %% Revision 1.23  1997/12/04 14:24:22  peterg
% %% Removed error message about through-pointing arrows
% %%
% %% Revision 1.22  1997/09/18 19:49:37  peterg
% %% Added test for uniquness of bonds on a component -- if non-unique
% %% implies same component at both ends of a bond.
% %%
% %% Revision 1.21  1997/09/16  15:14:14  peterg
% %% Added warning if a component has no bonds.
% %%

% %%
% %% Revision 1.1  1996/08/04 18:30:14  peter
% %% Initial revision
% %%
% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%


if nargin<7
  infofile='stdout';
else
  fnum = fopen(infofile, 'w');
end;

%Default to no components
components = [0];

  eval(['[comp_type, comp_name] = ', name, '_cmp(i)']);

  % There are n_comp_bonds bonds on this component with corresponding index
  [index,n_comp_bonds] = getindex(comp_near_bond,i);

  if index(1,1)==0
    mtt_info(sprintf("Component %s (%s) has no bonds", comp_name,
    comp_type),fnum);
  end;
  
  % Create the signed list of bonds on this component
  one = ones(n_comp_bonds,1);
  bond_list = index(:,1); %  bond at component
  
  % Check that all bonds are unique -- error if not
  if unique(bond_list)==0
    mtt_info(sprintf("Component %s (%s) is at both ends of a bond", comp_name,
    comp_type),fnum);
  end;
    
  bond_end = index(:,2);  % which end of bond at component?
  direction = -sign(bond_end-1.5*one);
  signed_bond_list = bond_list.*direction;
  components = add_bond(components,signed_bond_list',i);
end;

    signed_bond_index = port_bond(i);
    [other_bond_index,n_other] = getindex(port_bond,-signed_bond_index);
    if n_other == 1
      other_port_name = port_name(other_bond_index,:);
      other_subport = split(other_port_name, ',');
      [n_other_subports,junk] = size(other_subport);
      if n_other_subports~=n_subports
	mtt_info(['Vector ports ', port_name_i, ' and ', other_port_name, 'are not compatible'],fnum);
      end
    else 
      mtt_info(['Vector port ', port_name_i, ' has no matching port'], fnum);
    end;
    
    if other_bond_index>i %then its not been done yet
      mtt_info(['Vector port: ', port_name_i],fnum);
      mtt_info(['matching: ', other_port_name],fnum);
      % Remove sign info.
      bond_index = abs(signed_bond_index);
      sig = sign(signed_bond_index);
      
      % Put the first element of each port list in the expanded list
      exp_port_name = [exp_port_name; subport(1,:)];
      exp_port_name = [exp_port_name; other_subport(1,:)];

  % Check that number of bonds on the component is the same as the number of
  % ports
  [n_comp_ports,m_comp_ports] = size(port_list);
  if (n_comp_ports~=n_comp_bonds) & ...
	~(strcmp(comp_type,'zero')|strcmp(comp_type,'one'))
    message=sprintf('Component %s (%s) has %1.0f impinging bonds but has %1.0f ports', ...
	comp_name,comp_type,n_comp_bonds,n_comp_ports);
    mtt_info(message, fnum);
  end;
  
  unsorted_port_list="";
  if n_ports>0 % then there are some named ports
    % so find those associated with the bonds on this component.
    k=0; 
    for j = 1:n_comp_bonds

  else 
    k=0;
  end;
    
  %Either all ports or no ports should be labelled - write error
  %message if this is not so
  if (k~=0)&(k~=n_comp_bonds)
    mtt_info(['Component ', comp_name, ' (', comp_type, ') has wrong number of labels'], fnum); 
    mtt_info(sprintf("\tit has %1.0f labels but should have 0 or %1.0f",k,n_comp_bonds), fnum); 
  end;
  
  %Compute the number of labeled ports
  [n_unsorted_ports,m_unsorted_ports] = size(unsorted_port_list);
  if m_unsorted_ports==0
    n_unsorted_ports = 0;
  end;
  n_unsorted_ports,n_comp_bonds
  % One port defaults:
  if (n_comp_bonds==1)&(n_unsorted_ports==0)
    %if (direction(1)<0) & ~strcmp(comp_type,'SS') % Wrong way for default
    % mtt_info(['One-port ', comp_name, ' (', comp_type, ') has the sign pointing the wrong way '], fnum);
    %end;
    unsorted_port_list = port_list;
  end;
  
  %Two port defaults
  if (n_comp_bonds==2)&(n_unsorted_ports==0)
    if direction(1)==direction(2) % Wrong way for default
      % mtt_info(['Two-port ', comp_name, ' (', comp_type, ') does not have through-pointing arrows'], fnum);
    end;
    if direction(1)==1 %in
      % mtt_info([comp_name, ' in'],fnum);
      unsorted_port_list = ['in';'out'];
    else %reverse the order
      % mtt_info([comp_name, ' out'],fnum);
      unsorted_port_list = ['out';'in'];
    end;
  end;
  
  % Recompute the number of unsorted ports
  [n_unsorted_ports,m_unsorted_ports] = size(unsorted_port_list);
  if m_unsorted_ports==0
    n_unsorted_ports = 0;
  end;
  
  % Junctions or no lables(order of ports unimportant)
  if strcmp(comp_type,'zero')|strcmp(comp_type,'one')
    for j = 1:n_comp_bonds
      components(i,j) = signed_bond_list(j);
    end
  else %Order of ports is important
    unsorted_port_list, port_list
    if n_unsorted_ports==0
      mtt_info(['Component ', comp_name, ' (', comp_type, ') has no labeled ports'], fnum); 
    end;
    %Write out the signed bond list in the correct order
unsorted_port_list
for j = 1:n_comp_bonds
      j
      name_k = unsorted_port_list(j,:)
      k = name_in_list(name_k, port_list);
      % Check that it only appears once in port list
      if length(k)>1
	mtt_info(['Component ', comp_name, ' (', comp_type, ') has ports with the same name:  ', name_k], fnum); 
      end;
      
      %Check that it only appears one in the label list
      kk = name_in_list(name_k,unsorted_port_list);
      if length(kk)>1
	mtt_info(['Component ', comp_name, ' (', comp_type, ') has multiple port labels:  ', name_k], fnum); 
      end;
      
      if k==0
	mtt_info(['Component ', comp_name, ' (', comp_type, ') has an unrecognised port: ', name_k], fnum); 
      else
	components(i,k) = signed_bond_list(j);     
      end;
    end;
  end;
end;