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programargs.def
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1996-08-29
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980b
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34 lines
DEFINITION MODULE ProgramArgs;
(* Access to program arguments *)
IMPORT IOChan;
TYPE
ChanId = IOChan.ChanId;
(* Initially, and after a reset operation on the channel, if there are
no program arguments a call of IsArg returns FALSE, otherwise
input is taken from the first argument to the program, as defined for
the implementation.
*)
PROCEDURE ArgChan () : ChanId;
(* The returned value identifies a channel for reading program arguments *)
PROCEDURE IsArgPresent () : BOOLEAN;
(* Tests if there is a current argument to read from.
If not, read < IOChan.CurrentFlags() will be FALSE and attempting to read from
the argument channel will cause the exception notAvailable to be raised.
*)
PROCEDURE NextArg;
(* If there is another argument, causes subsequent input from the
argument device to come from the start of the next argument.
Otherwise there is no argument to read from - a call of IsArgPresent will
return FALSE
*)
END ProgramArgs.