On Wed, Oct 15, 2008 at 10:02 PM, Tom Lynch <[EMAIL PROTECTED]> wrote:
>
> Hi all, I have a naive question regarding Clojure macros. As someone
> new to Lisp-style macros, can I use the system to generate new names
> using substitution / token-pasting?
[snip]
> I realise this may be a huge ideological no-no :-)
Well, you'd better have a darn good reason to not be using namespaces
or a hash-map or something. :-)
But sure, it's possible:
user=> (defmacro paste-tokens [first second]
`(def ~(symbol (str first second)) []))
nil
user=> (macroexpand '(paste-tokens foo bar))
(def foobar [])
The thing to realize is that your macro is just returning a data
structure, and of course you can return a data structure that includes
computed symbol names. Another way to write the above macro may help
defuse some of the magic quoting magic:
(defmacro paste-tokens [first second]
(list 'def (symbol (str first second)) []))
--Chouser
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