--          This file is part of SmartEiffel The GNU Eiffel Compiler.
--       Copyright (C) 1994-2002 LORIA - INRIA - U.H.P. Nancy 1 - FRANCE
--          Dominique COLNET and Suzanne COLLIN - SmartEiffel@loria.fr
--                       http://SmartEiffel.loria.fr
-- SmartEiffel 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. SmartEiffel 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  SmartEiffel;  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

   is_like_current: BOOLEAN is false

   is_like_argument: BOOLEAN is true

   is_like_feature: BOOLEAN is false

   like_what: ARGUMENT_NAME2

   written_mark: STRING

   start_lookup_name: CLASS_NAME is
      local
         bc: BASE_CLASS
      do
	 -- I am not really convinced by this way of computing
	 -- the lookup class name. (Why isn't the `run_type' used?)
         bc := like_what.start_lookup_class
         if bc /= Void then
            Result := bc.name
         end
      end

   is_run_type: BOOLEAN is
      do
         if run_feature /= Void then
            Result := run_type.is_run_type
         end
      end

   run_type: E_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: E_TYPE): like Current is
      local
         rf: RUN_FEATURE; rt: E_TYPE
      do
         anchor_cycle_start
         rf := smart_eiffel.top_rf
         if rf.arguments = Void then
            error_handler.add_position(start_position)
            error_handler.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

   stupid_switch(run_time_set: RUN_TIME_SET): BOOLEAN is
      do
	 Result := standard_stupid_switch(run_time_set)
      end

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

   is_a(other: E_TYPE): BOOLEAN is
      do
         Result := run_type.is_a(other)
      end

feature {E_TYPE}

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

feature {NONE}

   run_feature: RUN_FEATURE

   make(sp: like start_position; lw: like like_what) is
      require
         not sp.is_unknown
         lw /= Void
      do
         start_position := sp
         like_what := lw
         written_mark_buffer.copy(fz_like)
         written_mark_buffer.extend(' ')
         written_mark_buffer.append(like_what.to_string)
         written_mark := string_aliaser.item(written_mark_buffer)
      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

invariant

   as_current /= like_what.to_string

end -- TYPE_LIKE_ARGUMENT

