(* M2Check.def perform rigerous type checking for fully declared symbols.

Copyright (C) 2020-2023 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 M2Check ;

(*
    Title      : M2Check
    Author     : Gaius Mulley
    System     : GNU Modula-2
    Date       : Fri Mar  6 15:32:10 2020
    Revision   : $Version$
    Description: provides a module to check the symbol type compatibility.
                 It assumes that the declaration of all dependants
                 is complete.
*)


(*
   ParameterTypeCompatible - returns TRUE if the nth procedure parameter formal
                             is compatible with actual.  If the string is empty then
                             no error is issued.
*)

PROCEDURE ParameterTypeCompatible (token: CARDINAL; format: ARRAY OF CHAR;
                                   procedure, formal, actual, nth: CARDINAL;
                                   isvar: BOOLEAN) : BOOLEAN ;


(*
   AssignmentTypeCompatible - returns TRUE if the des and the expr are assignment compatible.
                              If the string is empty then no error is issued.
*)

PROCEDURE AssignmentTypeCompatible (token: CARDINAL; format: ARRAY OF CHAR;
                                    des, expr: CARDINAL) : BOOLEAN ;


(*
   ExpressionTypeCompatible - returns TRUE if the expressions, left and right,
                              are expression compatible.
                              If the string is empty then no error is issued.
*)

PROCEDURE ExpressionTypeCompatible (token: CARDINAL; format: ARRAY OF CHAR;
                                    left, right: CARDINAL;
                                    strict, isin: BOOLEAN) : BOOLEAN ;


END M2Check.