(* NameKey.def provides a dynamic binary tree name to key.

Copyright (C) 2001-2023 Free Software Foundation, Inc.
Contributed by Gaius Mulley <gaius.mulley@southwales.ac.uk>.

This file is part of GNU Modula-2.

GNU Modula-2 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 3, or (at your option)
any later version.

GNU Modula-2 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 GNU Modula-2; see the file COPYING3.  If not see
<http://www.gnu.org/licenses/>.  *)

DEFINITION MODULE NameKey ;

(*
    Title      : NameKey.def
    Author     : Gaius Mulley
    System     : UNIX (GNU Modula-2)
    Date       : Mon Apr 23 17:20:48 2001
    Last edit  : Mon Apr 23 17:20:48 2001
    Description: NameKey provides a totally dynamic binary tree name to key
                 interface for the Modula-2 compiler.
*)

FROM SYSTEM IMPORT ADDRESS ;

EXPORT QUALIFIED Name, NulName,
                 MakeKey, GetKey, LengthKey, IsKey, WriteKey,
                 IsSameExcludingCase, KeyToCharStar, makekey,
                 CharKey ;


CONST
   NulName = 0 ;  (* No legal name.                      *)
                  (* NulName is not present in the Tree  *)

TYPE
   Name = CARDINAL ;


(*
   MakeKey - returns the Key of the symbol, a. If a is not in the
             name table then it is added, otherwise the Key of a is returned
             directly. Note that the name table has no scope - it merely
             presents a more convienient way of expressing strings. By a Key.
             These keys last for the duration of compilation.
*)

PROCEDURE MakeKey (a: ARRAY OF CHAR) : Name ;


(*
   makekey - returns the Key of the symbol, a. If a is not in the
             name table then it is added, otherwise the Key of a is returned
             directly. Note that the name table has no scope - it merely
             presents a more convienient way of expressing strings. By a Key.
             These keys last for the duration of compilation.
*)

PROCEDURE makekey (a: ADDRESS) : Name ;


(*
   GetKey - returns the name, a, of the key, key.
*)

PROCEDURE GetKey (key: Name; VAR a: ARRAY OF CHAR) ;


(*
   LengthKey - returns the StrLen of a Key.
*)

PROCEDURE LengthKey (Key: Name) : CARDINAL ;


(*
   IsKey - returns TRUE if string, a, is currently a key.
*)

PROCEDURE IsKey (a: ARRAY OF CHAR) : BOOLEAN ;


(*
   WriteKey - Display the symbol represented by Key.
*)

PROCEDURE WriteKey (key: Name) ;


(*
   IsSameExcludingCase - returns TRUE if key1 and key2 are
                         the same. It is case insensitive.
*)

PROCEDURE IsSameExcludingCase (key1, key2: Name) : BOOLEAN ;


(*
   KeyToCharStar - returns the C char * string equivalent for, key.
*)

PROCEDURE KeyToCharStar (key: Name) : ADDRESS ;


(*
   CharKey - returns the key[i] character.
*)

PROCEDURE CharKey (key: Name; i: CARDINAL) : CHAR ;


END NameKey.