--          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 TYPE_LIKE_ARGUMENT
   --
   -- For an anchored declaration type mark using a formal argument.
   -- 
   -- See also TYPE_LIKE and TYPE_LIKE_CURRENT.
   -- 

inherit TYPE_ANCHORED;
   
creation make, with
   
feature 
   
   like_what: ARGUMENT_NAME2;

   written_mark: STRING;

feature {NONE}

   run_feature: RUN_FEATURE;

feature
   
   is_like_current: BOOLEAN is false;

   is_like_argument: BOOLEAN is true;

   is_like_feature: BOOLEAN is false;


feature {NONE}
   
   make(sp: like start_position; lw: like like_what) is
      require
	 sp /= Void;
	 lw /= Void;
      do
	 start_position := sp;
	 like_what := lw;
	 tmp_written_mark.copy(fz_like);
	 tmp_written_mark.extend(' ');
	 tmp_written_mark.append(like_what.to_string);
	 written_mark := unique_string.item(tmp_written_mark);
      ensure
	 start_position = sp;
	 like_what = lw;
      end;

   with(model: like Current; rf: RUN_FEATURE) is
      require
	 model /= Void;
	 rf /= Void
      do
	 start_position := model.start_position;
	 like_what := model.like_what;
	 written_mark := model.written_mark;
	 run_feature := rf;
      ensure
	 start_position = model.start_position;
	 like_what = model.like_what;
	 written_mark = model.written_mark;
	 run_feature = rf
      end;

feature

   is_run_type: BOOLEAN is
      do
	 if run_feature /= Void then
	    Result := run_type.is_run_type;
	 end;
      end;
   
   run_type: TYPE is
      local
	 fal: FORMAL_ARG_LIST;
      do
	 fal := run_feature.arguments;
	 Result := fal.type(rank);
	 if Result.is_run_type then
	    Result := Result.run_type;
	 end;
      end;

   to_runnable(ct: TYPE): like Current is
      local
	 rf: RUN_FEATURE;
	 rt: TYPE;
      do
	 anchor_cycle_start;
	 rf := small_eiffel.top_rf;
	 if rf.arguments = Void then
	    eh.add_position(start_position);
	    eh.add_position(rf.start_position);
	    fatal_error(fz_bad_anchor);
	 end;
	 if run_feature = Void then
	    run_feature := rf;
	    Result := Current;
	 elseif run_feature = rf then
	    Result := Current;
	 else
	    !!Result.with(Current,rf);
	 end;
	 rt := Result.run_type;
	 if rt.is_anchored then
	    rt := rt.to_runnable(ct);
	 end;
	 anchor_cycle_end;
      end;

   rank: INTEGER is
      do
	 Result := like_what.rank;
      end;

   is_a(other: TYPE): BOOLEAN is
      do
	 Result := run_type.is_a(other)
      end;
   
feature {TYPE}

   short_hook is
      do
	 short_print.hook_or("like","like ");
	 like_what.short;
      end;

invariant
   
   us_current /= like_what.to_string;

end -- TYPE_LIKE_ARGUMENT