DEFINITION MODULE ConvTypes;

  (* Common types used in the string conversion modules *)

TYPE
  ConvResults =	(* Values of this type are used to express format of a string *)
  (
    strAllRight,   (* string format is correct for the corresponding conversion *)
    strOutOfRange, (* string is well-formed but the value cannot be represented *)
    strWrongFormat,(* the string is in the wrong format for the conversion *)
    strEmpty	   (* the given string is empty *)
  );

  ScanClass =  (* Values of this type are used to classify input to finite
		  state scanners *)
  (
    padding,	(* a leading or padding character at this point in the scan
		   - ignore it *)
    valid,	(* a valid character at this point in the scan - accept it *)
    invalid,	(* an invalid character at this point in the scan - reject it *)
    terminator	(* a terminating character at this point in the scan 
		   (not part of token) *)
  );

  ScanState =  (* The type of lexical scanning control procedures *)
    PROCEDURE (CHAR, VAR ScanClass, VAR ScanState);

END ConvTypes.
