--          This file is part of SmallEiffel The GNU Eiffel Compiler.
--          Copyright (C) 1994-98 LORIA - UHP - CRIN - INRIA - FRANCE
--            Dominique COLNET and Suzanne COLLIN - colnet@loria.fr 
--                       http://www.loria.fr/SmallEiffel
-- SmallEiffel 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, or (at your option)  any  later 
-- version. SmallEiffel 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  SmallEiffel;  see the file COPYING.  If not,
-- write to the  Free Software Foundation, Inc., 59 Temple Place - Suite 330,
-- Boston, MA 02111-1307, USA.
--
class FORMAL_GENERIC_ARG
   --   
   -- To store one formal generic argument.
   --
   
inherit GLOBALS;

creation make
   
feature 
   
   name: CLASS_NAME;
	 -- Name of the formal generic argument.
   
   constraint: TYPE;

feature {NONE}
   
   make(n: like name; c: like constraint) is
      require
	 n /= Void
      do
	 name := n;
	 constraint := c;
      ensure
	 name = n;
	 constraint = c
      end;

feature
   
   base_class: BASE_CLASS is
      do
	 Result := name.start_position.base_class;
      ensure
	 Result.is_generic
      end;
   
   rank: INTEGER is
	 -- In the corresponding declation list.
      do
	 check
	    base_class /= Void;
	    base_class.is_generic;
	    base_class.formal_generic_list.count >= 1;
	 end;
	 Result := base_class.formal_generic_list.index_of(Current.name);
      ensure
	 Result >= 1
      end;
      
   constrained: BOOLEAN is
      do
	 Result := (constraint /= void);
      end;
   
   start_position: POSITION is
      do
	 Result := name.start_position;
      end;
   
   pretty_print is
      do
	 name.pretty_print;
	 if constrained then
	    fmt.level_incr;
	    fmt.put_string("->");
	    constraint.pretty_print;
	    fmt.level_decr;
	 end;
      end;

   short is
      do
	 short_print.a_class_name(name);
	 if constrained then
	    short_print.hook_or("arrow","->");
	    constraint.short;
	 end;
      end;
   
invariant
   
   name /= Void;
   
end -- FORMAL_GENERIC_ARG