[REBOL] Re: Why cant mutually exclusive refinements have the same argument name
From: alex:pini:mclink:it at: 5-Sep-2000 22:49
>- Open Your Mind -<
Quoting from [princepawn--lycos--com's] message (05-Sep-00 17:03:50).
p> I have a function that will either get or put a filename... of course I want to use
the same name for the file regardless, and this will not pose a problem because the arguments
are mutually exclusive.
p>
p> However, REBOL is complaining about me using the same name for 2 mutually exclusive
arguments
p>
p>
p> REBOL [ Title: "Main script" ]
p>
p> main: func [ "Performs order file transfer"
p> /name-product product-name [string!] "The product name"
p> /index-upfile upfile-index [integer!] "The index to be used for the upfile. Useful
when you have many upfiles and don't want to overwrite a previous one."
p> /put orderfile-name [string!] "Put an orderfile on our server"
p> /get orderfile-name [string!] "Put an orderfile on our server"
p> /date-upfile upfile-date [date!] "The date to be encoded into the upfile name"
p> /create-upfile upfile-name [string!] "This automatically creates and upfile. The
argument to this option is the word 'cancel' or 'nocancel', specifying whether you want
the upfile to contain a cancel or nocancel command"
p> /wait-on-controlfile controlfile-wait-time [time!] "Specifies the localtime that
the script will continue to try to look for the control file until. This option can only
be used with the /get option"
p> ] [ ]
Try something like this:
(...)
/put put-orderfile-name [string!] "Put an orderfile on our server"
/get get-orderfile-name [string!] "Get an orderfile from our server"
(...)
if put [ orderfile-name: put-orderfile-name ]
if get [ orderfile-name: get-orderfile-name ]
But be careful: this way, /get overrides /put *for the string only*, they're not actually
mutually exclusive. That is, you can specify both, and the rest of the function can malfunction
reacting to both (and with just the /get string).
Computers do what you tell them to do, not what you want.
:-/
Oh, and note both /put's and /get's help strings say "Put". :-)
Alternatively, since you state they're mutually exclusive, it means at least one *must*
apply, so eliminate one refinement and keep orderfile-name among the common arguments.
For example do a get (by default) unless the /put refinement is specified.
Alessandro Pini ([alex--pini--mclink--it])
We are programmed just to do / Anything you want us to
(Kraftwerk)
