--          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_FEATURE
   --
   -- For an anchored declaration type mark using a feature name.
   -- 
   -- See also TYPE_LIKE_ARG and TYPE_LIKE_CURRENT.
   --   

inherit TYPE_ANCHORED redefine is_like_feature, like_feature end;
   
creation make, with
   
feature 
   
   like_what: FEATURE_NAME;
   
   written_mark: STRING;
   
   run_type: TYPE;
	 -- When runnable.

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(' ');
	 like_what.declaration_in(tmp_written_mark);
	 written_mark := unique_string.item(tmp_written_mark);
      ensure
	 start_position = sp
      end;

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

feature

   is_like_feature: BOOLEAN is true;
   
   is_like_current: BOOLEAN is false;

   is_like_argument: BOOLEAN is false;

feature
   
   like_feature: FEATURE_NAME is
      do
	 Result := like_what; 
      end;
   
   is_run_type: BOOLEAN is
      do
	 Result := run_type /= Void;
      end;
   
   to_runnable(ct: TYPE): like Current is
      local
	 rc: RUN_CLASS;
	 rt: TYPE;
      do
	 anchor_cycle_start;
	 rc := ct.run_class;
	 rt := rc.get_result_type(like_what);
	 if run_type = Void then
	    run_type := rt;
	    Result := Current;
	 elseif run_type = rt then
	    Result := Current;
	 else
	    !!Result.with(Current,rt);
	 end;
	 anchor_cycle_end;
      end;
   
   is_a(other: TYPE): BOOLEAN is
      local
	 tlf: like Current;
      do
	 if other.is_like_feature then
	    tlf ?= other;
	    if like_what.to_string = tlf.like_what.to_string then
	       Result := true;
	       --eh.add_position(other.start_position);
	       --warning(start_position,"YOO");
	    else
	       Result := run_type.is_a(other);
	    end;
	 else
	    Result := run_type.is_a(other);
	 end;
	 if not Result then
	    eh.add_position(start_position);
	 end;
      end;
   
feature {TYPE}

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

end -- TYPE_LIKE_FEATURE