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(* M2StackWord.def provides a generic stack for WORD sized objects.
Copyright (C) 2001-2025 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 M2StackWord ;
(*
Title : M2StackWord
Author : Gaius Mulley
System : UNIX (GNU Modula-2)
Date : Fri Oct 12 17:26:50 2001
Revision : $Version$
Description: provides a generic stack for WORD sized objects.
*)
FROM SYSTEM IMPORT WORD ;
EXPORT QUALIFIED StackOfWord, InitStackWord, KillStackWord, PushWord,
ReduceWord, RemoveTop, PopWord, PeepWord, IsEmptyWord,
NoOfItemsInStackWord ;
TYPE
StackOfWord ;
(*
InitStackWord - creates and returns a new stack.
*)
PROCEDURE InitStackWord () : StackOfWord ;
(*
KillStackWord - destroys a stack, returning NIL.
*)
PROCEDURE KillStackWord (s: StackOfWord) : StackOfWord ;
(*
PushWord - pushes a word, w, onto, s.
*)
PROCEDURE PushWord (s: StackOfWord; w: WORD) ;
(*
PopWord - pops an element from stack, s.
*)
PROCEDURE PopWord (s: StackOfWord) : WORD ;
(*
IsEmptyWord - returns TRUE if stack, s, is empty.
*)
PROCEDURE IsEmptyWord (s: StackOfWord) : BOOLEAN ;
(*
PeepWord - returns the element at, n, items below in the stack.
Top of stack can be seen via Peep(s, 1)
*)
PROCEDURE PeepWord (s: StackOfWord; n: CARDINAL) : WORD ;
(*
ReduceWord - reduce the stack by n elements.
*)
PROCEDURE ReduceWord (s: StackOfWord; n: CARDINAL) ;
(*
RemoveTop - throw away the top element of the stack.
*)
PROCEDURE RemoveTop (s: StackOfWord) ;
(*
NoOfItemsInStackWord - returns the number of items held in the stack, s.
*)
PROCEDURE NoOfItemsInStackWord (s: StackOfWord) : CARDINAL ;
END M2StackWord.
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