[REBOL] Re: [bug?] Problem with 'load
From: SunandaDH:aol at: 28-Nov-2003 4:07
Thanks Anton and Max
> In my tests it looks like the needs block isn't evaluated,
> just examined.
We might be seeing different behaviour on different versions of REBOL -- I'm
looking at Win and Unix. It looks to me like the header is *always*
evaluated, including the needs check, despite the /all refinement. Try this
===save next lines as temp.r===
A preamble: there is text before header, containing "bad things
More text before rebol [print "gets printed if this is taken as the header"]
rebol this isn't a header despite starting with the magic word
rebol [print "gets printed if header is evaluated" file: %fff needs: [1.2.1
print "gets printed if script is executed"
=====end of test script=====
This is what I see:
>> load %temp.r ;; evaluates header; returns body
>> load/all %temp.r ;; crashes because preamble is not valid REBOL
>> load/header %temp.r ;; evaluates header; returns header
>> load/header/all %temp.r ;; evaluates header; returns header
What I want is a way to load the header of *any* REBOL script regardless of
its needs setting. Any one any ideas?
>is this dialect actualy usable as a function given a block?
Looks like you can do a lot with it. I guess part of the original idea is
that a script can load another's header and thus learn a lot about it. You could
use that to build some sort of documentation tool.
Or if I wrote something that alters a script (like a pretty printer) I could
use the header to give it directives:
prettyprint [maxwidth: 50 comments: 'keep blanklines: 'drop]
Trouble is. my prettyprinter would seem to be only able to load scripts that
run under the same version that it does....Annoying or what?