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development version newLISP 8.8.6
Posted: Mon May 01, 2006 4:32 pm
by Lutz
• optional break condition in 'for, 'dolist' and 'dotimes'
• new 'letex' combines let and macro expansion
• bug fixes and doc additions/changes
files and change notes:
http://newlisp.org/downloads/development/
Lutz
Posted: Mon May 01, 2006 7:24 pm
by rickyboy
I was looking at the manual for the 'letex' documentation. It says:
"The last example shows how 'letex' can be combined with 'define-macro' to do variable expansion of macro variables into an expression to be evaluated:
Code: Select all
(define-macro (dolist-while)
(letex (var ((args) 0 0)
lst ((args) 0 1)
cnd ((args) 0 2)
body ((args) -1))
(catch (dolist (var lst)
(if (set 'res cnd) body (throw res) )))))
> (dolist-while (x '(a b c d e f) (!= x 'd)) (println x))
a
b
c
nil
'dolist-while' loops through a list while the condition is true."
But, it will not work for a 'body' with more than one form:
Code: Select all
> (dolist-while (x '(a b c d e f) (!= x 'd)) (print "x=") (println x))
a
b
c
nil
This one seems to work for multi-form 'body's.
Code: Select all
(define-macro (dolist-while)
(letex (var ((args) 0 0)
lst ((args) 0 1)
cnd ((args) 0 2)
body (cons 'begin (1 (args))))
(let (res)
(catch (dolist (var lst)
(if (set 'res cnd) body (throw res)))))))
> (dolist-while (x '(a b c d e f) (!= x 'd)) (print "x=") (println x))
x=a
x=b
x=c
nil
Thank you, Lutz, for providing this functionality. --Ricky
Posted: Mon May 01, 2006 8:42 pm
by Lutz
Thanks Rick for catching this, it will be corrected in the manual.
Lutz
ps: BTW 'letex' will do expansion on multiple expression bodies
Posted: Mon May 15, 2006 7:39 pm
by newdep
Yesssssss ..Thanks Lutz!!
you added some very nice extras in the last 2 releases!! great..
Posted: Mon May 15, 2006 9:11 pm
by Lutz
... and more to come, try newLISP's new syntax highlighting service here:
http://newlisp.org/code/highlight.html
you can try it with Pjot's url:
http://www.turtle.dds.nl/newlisp/speaker.lsp
Lutz
ps: read more about it here:
http://newlisp.org/index.cgi?page=News