Hi,
I am attempting to write a macro which implicitly backquotes its arguments. After asking around a bit, I was directed to cl-quasi-quote as a possible solution to my problem. I have installed cl-quasi-quote, but am having a little trouble figuring out how to use the library, since all the examples seem to involve transforming a Lisp to some other language, which isn't really what I want to do. So my question is, how would you use cl-quasi-quote to write just a basic macro wrapping an expression in a quasi-quote? (Its a trivial example, but if I can figure this one out I should be able to do what I want in my project.)
Thanks.
I am attempting to write a macro which implicitly backquotes its arguments. After asking around a bit, I was directed to cl-quasi-quote as a possible solution to my problem. I have installed cl-quasi-quote, but am having a little trouble figuring out how to use the library, since all the examples seem to involve transforming a Lisp to some other language, which isn't really what I want to do. So my question
currently our goal is to transform some other languages to lisp. more precisely: to lisp forms that emit the other language when executed. the languages we need now: xml, js, and sql (but cl-rdbms already has a half-assed version, so it works for now)
is, how would you use cl-quasi-quote to write just a basic macro wrapping an expression in a quasi-quote? (Its a trivial example, but if I can figure this one out I should be able to do what I want in my project.)
i'm not sure what you want, but maybe you should take a look at alexandria:once-only or similar macros. posting an example would help, too.
if you really need read-time stuff, then there's a lisp.lisp in cl-qq, which is (or better, should be) a simple lisp quasi quote as specified by the standard. but currently it's commented out because it's lagging behind the rest of the lib. (and i think it really never worked...)
it will be revived eventually, but it's not priority for us, while we have numerous other priorities, so... patches are welcome meanwhile! :)
happy hacking,
On Mon, May 26, 2008 at 2:05 AM, Attila Lendvai attila.lendvai@gmail.com wrote:
I am attempting to write a macro which implicitly backquotes its arguments. After asking around a bit, I was directed to cl-quasi-quote as a possible solution to my problem. I have installed cl-quasi-quote, but am having a little trouble figuring out how to use the library, since all the examples seem to involve transforming a Lisp to some other language, which isn't really what I want to do. So my question
currently our goal is to transform some other languages to lisp. more precisely: to lisp forms that emit the other language when executed. the languages we need now: xml, js, and sql (but cl-rdbms already has a half-assed version, so it works for now)
Ok, that's what I thought from looking at the your project page, but the name made me think perhaps you had a portable implementation of backquote.
is, how would you use cl-quasi-quote to write just a basic macro wrapping an expression in a quasi-quote? (Its a trivial example, but if I can figure this one out I should be able to do what I want in my project.)
i'm not sure what you want, but maybe you should take a look at alexandria:once-only or similar macros. posting an example would help, too.
I am trying to something along the lines of the following, which works unportably on CLISP.
[1]> (defvar x 'a) X [2]> (defmacro wrap (expr) (list 'system::backquote expr)) WRAP [2]> (wrap x) X [4]> (wrap (system::unquote x)) A
Except I'd also like to do
[6]> (wrap ,x)
which currently fails on CLISP because of read-time checks (the backquote doesn't appear in the form until macro-expansion time, which isn't early enough to make the reader happy).
if you really need read-time stuff, then there's a lisp.lisp in cl-qq, which is (or better, should be) a simple lisp quasi quote as specified by the standard. but currently it's commented out because it's lagging behind the rest of the lib. (and i think it really never worked...)
Perhaps...
it will be revived eventually, but it's not priority for us, while we have numerous other priorities, so... patches are welcome meanwhile! :)
I don't know if I can provide patches; I've already been sidetracked once this project :)
Thanks.
cl-quasi-quote-devel@common-lisp.net
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Attila Lendvai -
Elliott Slaughter