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Message from discussion LISP - The Challenge of Nested Macros - [#V0.3]
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ilias  
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 More options Sep 12 2002, 4:52 pm
Newsgroups: comp.lang.lisp
From: ilias <at_n...@pontos.net>
Date: Fri, 13 Sep 2002 00:00:41 +0300
Local: Thurs, Sep 12 2002 5:00 pm
Subject: Re: LISP - The Challenge of Nested Macros - [#V0.3]
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Joe Marshall wrote:
> ilias <at_n...@pontos.net> writes:

>>,',long is the same as ,long
> This is not true.

in context of macroexpansion: of course it is.

>>,' evaluates to 'nothing' so you can simply drop it.
> Nor is this.

of course it is.

>>  (defmacro abbrev (short long)
>>    `(defmacro ,short (&rest args)
>>      `(,long ,@args)))

>>looks easier now.
> Looks wrong now, too.

simply correct.

> (defmacro abbrev1 (short long)
>   `(defmacro ,short (&rest args)
>       `(,',long ,@args)))

> (defmacro abbrev2 (short long)
>   `(defmacro ,short (&rest args)
>      `(,long ,@args)))

> (abbrev1 nice-and-short horrendously-long)

> (macroexpand '(nice-and-short a b c)) => (horrendously-long a b c)

> (abbrev2 shorter even-more-horrendously-long)

> (macroexpand '(shorter a b c))
> ;; Error:  The variable LONG is unbound

oh.

macroexpand.

i'm a lisp-novice.

this function is new to me.

i'll use it.

btw: The LISP you use seems to be *not* conforming to the ANSI Standard.

Cause ANSI-Conforming Common Lisp must execute this code.

> I only mention this because there just *might* be newbies still
> reading these and I don't want them to become confused.

Have you broken an agreement? you sound like this.

Anyway.


 
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