(* M2CaseList.def implement ISO case label lists.

Copyright (C) 2009-2023 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 M2CaseList ;

(*
    Title      : M2CaseList
    Author     : Gaius Mulley
    System     : GNU Modula-2
    Date       : Fri Jul 24 09:53:48 2009
    Revision   : $Version$
    Description:
*)

FROM DynamicStrings IMPORT String ;
FROM Lists IMPORT List ;


(*
   PushCase - create a case entity and push it to an internal stack.
              rec is NulSym if this is a CASE statement.
              If rec is a record then it indicates a possible
              varients reside in the record to check.
              Both rec and va might be NulSym and then the expr
              will contain the selector expression to a case statement.
              Return the case id.
*)

PROCEDURE PushCase (rec, va, expr: CARDINAL) : CARDINAL ;


(*
   PopCase - pop the top element of the case entity from the internal
             stack.
*)

PROCEDURE PopCase ;


(*
   ElseCase - indicates that this case varient does have an else clause.
*)

PROCEDURE ElseCase (f: CARDINAL) ;


(*
   BeginCaseList - create a new label list.
*)

PROCEDURE BeginCaseList (v: CARDINAL) ;


(*
   EndCaseList - terminate the current label list.
*)

PROCEDURE EndCaseList ;


(*
   AddRange - add a range to the current label list.
*)

PROCEDURE AddRange (r1, r2: CARDINAL; tok: CARDINAL) ;


(*
   CaseBoundsResolved - returns TRUE if all constants in the case list, c,
                        are known to GCC.
*)

PROCEDURE CaseBoundsResolved (tokenno: CARDINAL; c: CARDINAL) : BOOLEAN ;


(*
   TypeCaseBounds - returns TRUE if all bounds in case list, c, are
                    compatible with the tagged type.
*)

PROCEDURE TypeCaseBounds (c: CARDINAL) : BOOLEAN ;


(*
   OverlappingCaseBounds - returns TRUE if there were any overlapping bounds
                           in the case list, c.  It will generate an error
                           messages for each overlapping bound found.
*)

PROCEDURE OverlappingCaseBounds (c: CARDINAL) : BOOLEAN ;


(*
   MissingCaseBounds - returns TRUE if there were any missing bounds
                       in the varient record case list, c.  It will
                       generate an error message for each missing
                       bounds found.
*)

PROCEDURE MissingCaseBounds (tokenno: CARDINAL; c: CARDINAL) : BOOLEAN ;


(*
   MissingCaseStatementBounds - returns TRUE if the case statement has a missing
                                clause.  It will also generate error messages.
*)

PROCEDURE MissingCaseStatementBounds (tokenno: CARDINAL; c: CARDINAL) : BOOLEAN ;


(*
   WriteCase - displays the case list.
*)

PROCEDURE WriteCase (c: CARDINAL) ;


END M2CaseList.
