Is there a way to write something like this in newlisp?
`(1 , (+ 2 3))
So that it evaluates to:
(1 5)
It looks like I have to use some like a macro to achieve this
effect.
can do: eval of a list of elements
> (map 'eval '(1 (+ 2 3)))
(1 5)
>
Nigel
Quote from: "nigelbrown"
> (map 'eval '(1 (+ 2 3)))
(1 5)
>
Nigel
Clever - Thanks!
I was hoping to do something like
`(html (body (@ (text blue) ...) ...)
and have unquoted expressiion to fill in.
I know I can use the cgi module instead and
embed newlisp code instead as the dual of this
approach but sometimes it is nice to use the
dual.
If I use the map eval for nested lists it gets
tricky and also I would have to quote again
everything I didnt' want evaluated. Would
it be too costly space or execution wise to
add quasiquote and unquote to newlisp?
The functon 'expand' will look for symbols on every level of a nested list and fill in the evaluation of those symbols:
(set 'x 2)
(set 'a '(d e))
(set 'e "hello")
(set 'HTML '(a x (b c x)))
(expand HTML 'x 'a 'e) => ((d "hello") 2 (b c 2))
Note that 'expand' works in an incremental fashion: the 'e' is filled in first by expanding 'a', then 'e' is expanded into "hello"
Lutz