[REBOL] Re: To do or not to do?
From: al::bri::xtra::co::nz at: 29-Nov-2001 20:41
Colin wrote:
> Rules: [
> "(Length? to-string *) > 0" "No data"
> "date? *" "Bad date"
> "(* - 14 ) < now/date" "Too old"
> "specialcheck * " "Not special"
> ]
Better would be:
Rules: [
[(Length? to-string Value) > 0] "No data"
[date? Value] "Bad date"
[(Value - 14) < now/date] "Too old"
[specialcheck Value] "Not special"
]
And then instead of:
> foreach [rule message] Rules [
> if not (do replace/all copy rule "*" mold LoadedValue) [
> print [LoadedValue " fails rule: " Message]
> break
> ] ; if
> ] ; for
try something like:
foreach [Rule Message] Rules [
Value: LoadedValue
if not do bind Rule 'Value [
print [Value "fails rule:" Message]
break
]
]
This way you avoid Rebol having to repeatedly parse the string. Instead you
work directly with Rebol values, and avoid having to use special syntax in
your rules.
I hope that helps!
Andrew Martin
Who wishes Rebol could play DVD movies...
ICQ: 26227169 http://valley.150m.com/
