[REBOL] Re: Compose on tag! values
From: nitsch-lists:netcologne at: 16-Oct-2003 0:51
Am Mittwoch, 15. Oktober 2003 22:33 schrieb Andrew Martin:
> What do people think about extending 'compose to work within tag!
> values? For example:
>
> paragraph_colour: "green"
> compose [
> <p style="Color: (paragraph_colour);">
> ]
> which results in:
> [
> <p style="Color: green;">
> ]
>
> Comments, criticism, witticisms? :)
>
Something similar was suggested by Carl a while ago.
He wanted to process perl-based templates,
which mark their variables with "$".
IIRC he thought about a native.
Gabriele posted a parse-based prototype.
I think its usefull. aboids a lot clutter.
The idea of integrating it in compose is interesting.
Carl mentions somewhere how cool 'repend is for html-building.
integrating tag-expansions could be even better.
my personal favorite favorite function gets its replace-arguments
explicitely, so one would write
subst[ #PG paragraph_color ] [
<p style="Color:($PG;">
]
which i find more readable.
(shows me which variables are hidden in the html)
source:
subst: func [vars string] [
string: copy string
foreach [var val] reduce vars [
replace/all string join "$" var val
]
string
]
has a bug with
subst[#a "$b" #b "demo"] {this is a $a}
== "this is a demo"
instead of {this is a $b},
but works otherwise.
recently i discovered i like to create c-style code
with rebol. C has all this {} which fit very well with rebols strings.
so c-code can be pasted in rebol-source without problems, then
the $..-values are replaced.
subst[#what "world]{
int main(){
printf("Hello $what");
}
}
works then :)
> Andrew J Martin
-Volker
