[REBOL] Re: How to check function arguments? - Syntax REBOLution ...
From: christian:ensel:gmx at: 9-Jun-2002 22:44
Hello Gabriele,
on Sunday, 09-Jun-02, 15:12:46, Gabriele Santilli wrote:
> REBOL does not support variable number of arguments because of its
> freeform syntax.
As with all rules there seems to be an expection:
The list of arguments to MAKE as specified by
>> source make
== make: native [
"Constructs and returns a new value."
type [any-type!] "The datatype or example value."
spec [any-type!] "The attributes of the new value."
]
says there are exactly two arguments TYPE and SPEC, which is true in the case
of
>> make block! 5
== []
But that given I really can't explain why
>> make function! [] ; two arguments, as suggested
** Script Error: Invalid argument: (missing value)
** Near: make function! []
fails and why instead of
>> make function! [[ ... ] [ ... ]] ; two arguments
- which one should consider to be what MAKE expects of us to do - we're all
used to write
>> make function! [ ... ] [ ... ] ; three arguments
obviously violating the specification of make ...
As said before, I really can't explain this to me.
Looks as if all ANY-FUNCTION!s are equal, but some NATIVE!s are more equal ...
Any ideas, somebody?
Regards,
Christian
