On Aug 14, 2009, at 12:48 AM, Daniel Lyons <fus...@storytotell.org>
wrote:
>
>
> On Aug 13, 2009, at 5:30 PM, Bradbev wrote:
>
>>>> More complex "reader" macros could be (infix x + y + z / 3).
>>>
>>> I think you can already do that with regular macros.
>>
>> I don't think so. Macros are invoked after the read stage but before
>> evaluation of arguments. This kind of macro would be invoked without
>> the text going through any kind of reader expansion.
>
>
> Isn't reader expansion exactly what you don't want?
>
> user> (defmacro infix [& args]
> `(quote ~args))
> #'user/infix
> user> (infix 3 + 4 * 7)
> (3 + 4 * 7)
>
> I don't understand what's stopping anyone from implementing the body
> of that macro to make it actually implement infix arithmetic.
That particular example may not have to be a macro at all:
http://paste.lisp.org/display/75230
I think people want reader macros for a couple different reasons.
Sometimes it's just to remove parens from a function or macro call."
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