Amiga ACS 1998 #4/amigaacscoverdisc1998-041998.iso/utilities/shareware/dev/ppcsmalleiffel/lib_se/class_name.e

Text File | 1998-01-16 | 4.6 KB | 185 lines

--          This file is part of SmallEiffel The GNU Eiffel Compiler.
--          Copyright (C) 1994-98 LORIA - UHP - CRIN - INRIA - FRANCE
--            Dominique COLNET and Suzanne COLLIN - [e-mail]
--                       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 CLASS_NAME
   --
   -- To store the base class name of a class.
   --

inherit
   NAME
      redefine fill_tagged_out_memory
      end;

creation make

creation {BASE_CLASS}
   make_unknown

feature

   start_position: POSITION;

feature {NONE}

   make_unknown is
      do
     !!start_position.with(1,1,Current);
     to_string := unknown_name;
      end;

feature

   make(n: STRING; sp: like start_position) is
      require
     n /= Void;
      do
     start_position := sp;
     to_string := unique_string.item(n);
      ensure
     start_position = sp;
     to_string = unique_string.item(n)
      end;

feature

   to_key: STRING is
      do
     Result := to_string;
      end;

   fill_tagged_out_memory is
      do
     tagged_out_memory.append(to_string);
      end;

   is_unknown: BOOLEAN is
      do
     Result := to_string = unknown_name;
      end;

   is_subclass_of(other: CLASS_NAME): BOOLEAN is
      require
     to_string /= other.to_string;
     eh.empty;
      do
     if us_any = other.to_string then
        Result := true;
     elseif us_none = other.to_string then
     else
        Result := base_class.is_subclass_of(other.base_class);
     end;
      ensure
     eh.empty;
      end;

feature

   predefined: BOOLEAN is
     -- All following classes are handled in a special way
     -- by the TYPE_* corresponding class.
      do
     Result := (us_any = to_string or else
            us_array = to_string or else
            us_boolean = to_string or else
            us_character = to_string or else
            us_double = to_string or else
            us_integer = to_string or else
            us_none = to_string or else
            us_pointer = to_string or else
            us_real = to_string or else
            us_string = to_string);
      end;

   to_runnable: TYPE is
     -- Return the corresponding simple (not generic) run type.
      do
     if us_any = to_string then
        !TYPE_ANY!Result.make(start_position);
     elseif us_boolean = to_string then
        !TYPE_BOOLEAN!Result.make(start_position);
     elseif us_character = to_string then
        !TYPE_CHARACTER!Result.make(start_position);
     elseif us_double = to_string then
        !TYPE_DOUBLE!Result.make(start_position);
     elseif us_integer = to_string then
        !TYPE_INTEGER!Result.make(start_position);
     elseif us_none = to_string then
        !TYPE_NONE!Result.make(start_position);
     elseif us_pointer = to_string then
        !TYPE_POINTER!Result.make(start_position);
     elseif us_real = to_string then
        !TYPE_REAL!Result.make(start_position);
     elseif us_string = to_string then
        !TYPE_STRING!Result.make(start_position);
     else
        !TYPE_CLASS!Result.make(Current);
     end;
      end;

   base_class: BASE_CLASS is
      do
     Result := small_eiffel.base_class(Current);
      end;

   is_a(other: like Current): BOOLEAN is
      require
     other /= Void;
     eh.empty;
      local
     to_string2: STRING;
     bc1, bc2: like base_class;
      do
     to_string2 := other.to_string;
     if us_any = to_string2 then
        Result := true;
     elseif to_string = to_string2 then
        Result := true;
     elseif us_none = to_string2 then
     else
        bc1 := base_class;
        bc2 := other.base_class;
        if bc1 = Void then
           eh.append("Unable to load ");
           eh.append(to_string);
           error(start_position,fz_dot);
        elseif bc2 = Void then
           eh.append("Unable to load ");
           eh.append(to_string2);
           error(start_position,fz_dot);
        else
           Result := bc1.is_subclass_of(bc2);
        end;
     end;
      end;

feature {EIFFEL_PARSER}

   identify(s: STRING) is
      require
     is_unknown
      do
     to_string := unique_string.item(s);
      ensure
     to_string = unique_string.item(s)
      end;

feature {NONE}

   unknown_name: STRING is "FOO";

end -- CLASS_NAME