On Sun, Nov 11, 2012 at 02:24:17PM +0100, Răzvan Rotaru wrote: > On 11 November 2012 13:30, Peter Bex <peter....@xs4all.nl> wrote: > Yes, behaviour is correct, but implementation is not complete, hence the > next version of js-macro. > > > You're trying to use MAP on a macro. That's not possible because > > macros are not first-class (this is true in Common Lisp as well). > > > > Well, essentially what I have here is a macro calling itself. How can I do > that?
Generally, you can't. There are a few things you can do instead: - Expand to a new call to (js ...) for each of the elements. - Loop manually over the cdr inside the macro (maybe using map and an anonymous lambda). - Move the real conversion work into a procedure. This can be used by the macro, and the procedure can call itself. This is a bit tricky because you'll need to define the procedure in a begin-for-syntax block or put it in a separate module and require-for-syntax it. > I am trying to build a javascript DSL, similar to parenscript. The code > above is very simple and should behave like this: > > (js 123) => "123" > (js "123") => "\"123\"" > (js (1 2 3)) => "1(2, 3)" > The first two are primitives, the last is a function call. For simplicity, > I ignored the comma that separates parameters in the function call. So the > output I'm expecting from my code is actually: > > (js (1 2 3)) => "1(23)" I think that should be pretty easy. Cheers, Peter -- http://sjamaan.ath.cx -- "The process of preparing programs for a digital computer is especially attractive, not only because it can be economically and scientifically rewarding, but also because it can be an aesthetic experience much like composing poetry or music." -- Donald Knuth _______________________________________________ Chicken-users mailing list Chicken-users@nongnu.org https://lists.nongnu.org/mailman/listinfo/chicken-users
