(* Library module defined by the International Standard
   Information technology - programming languages
   BS ISO/IEC 10514-1:1996E Part 1: Modula-2, Base Language.

   Copyright ISO/IEC (International Organization for Standardization
   and International Electrotechnical Commission) 1996-2021.

   It may be freely copied for the purpose of implementation (see page
   707 of the Information technology - Programming languages Part 1:
   Modula-2, Base Language.  BS ISO/IEC 10514-1:1996).  *)

DEFINITION MODULE WholeConv;

  (* Low-level whole-number/string conversions *)

IMPORT
  ConvTypes;

TYPE
  ConvResults = ConvTypes.ConvResults;
        (* strAllRight, strOutOfRange, strWrongFormat, strEmpty *)

PROCEDURE ScanInt (inputCh: CHAR;
                   VAR chClass: ConvTypes.ScanClass;
                   VAR nextState: ConvTypes.ScanState) ;
  (* Represents the start state of a finite state scanner for signed
     whole numbers - assigns class of inputCh to chClass and a
     procedure representing the next state to nextState.
  *)

PROCEDURE FormatInt (str: ARRAY OF CHAR): ConvResults;
  (* Returns the format of the string value for conversion to INTEGER. *)

PROCEDURE ValueInt (str: ARRAY OF CHAR): INTEGER;
  (* Returns the value corresponding to the signed whole number string
     value str if str is well-formed; otherwise raises the WholeConv
     exception.
   *)

PROCEDURE LengthInt (int: INTEGER): CARDINAL;
  (* Returns the number of characters in the string representation of
     int.
   *)

PROCEDURE ScanCard (inputCh: CHAR; VAR chClass: ConvTypes.ScanClass;
                    VAR nextState: ConvTypes.ScanState);
  (* Represents the start state of a finite state scanner for unsigned
     whole numbers - assigns class of inputCh to chClass and a procedure
     representing the next state to nextState.
   *)

PROCEDURE FormatCard (str: ARRAY OF CHAR): ConvResults;
  (* Returns the format of the string value for conversion to CARDINAL.
   *)

PROCEDURE ValueCard (str: ARRAY OF CHAR): CARDINAL;
  (* Returns the value corresponding to the unsigned whole number string
     value str if str is well-formed; otherwise raises the WholeConv
     exception.
   *)

PROCEDURE LengthCard (card: CARDINAL): CARDINAL;
  (* Returns the number of characters in the string representation of
     card.
   *)

PROCEDURE IsWholeConvException (): BOOLEAN;
  (* Returns TRUE if the current coroutine is in the exceptional execution
     state because of the raising of an exception in a routine from this
     module; otherwise returns FALSE.
  *)

END WholeConv.