On Aug 14, 2009, at 2:03 AM, Chouser <[email protected]> wrote:
>
>
> On Aug 14, 2009, at 12:48 AM, Daniel Lyons <[email protected]>
> 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."
(sorry, finger slipped on the send button)
Another rather different reason is to implement features that would
otherwise require manually escaped strings as was mentioned earlier.
Perhaps these different desires can fulfilled with two different
constructs.
--Chouser
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