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Re: Macro for replacing a placeholder in an expression

From: Linus Björnstam
Subject: Re: Macro for replacing a placeholder in an expression
Date: Fri, 05 Aug 2022 11:42:20 +0200
User-agent: Cyrus-JMAP/3.7.0-alpha0-758-ge0d20a54e1-fm-20220729.001-ge0d20a54

I wrote this, which does a tree fold over a sexp:

It is unhygienic currently, and I will probably never change because I only use 
it at the repl. 

The code is really just a syntax-case version of the fast and efficient flatten 
algorithm, but without flattening. 

  Linus Björnstam

On Sat, 30 Jul 2022, at 23:13, Maxime Devos wrote:
> On 30-07-2022 17:42, Zelphir Kaltstahl wrote:
>> Does this mean, that recursive application of a macro inside a macro 
>> is impossible? To expand to subforms being the same macro again and 
>> this way transform a whole tree of s-expressions?
> You can have recursive macros, see e.g. the let^ macro at 
> <>.
> However, I do not see a way to implement recursivity the same way for 
> your macro.
> Greetings,
> Maxime.
> Attachments:
> * OpenPGP_0x49E3EE22191725EE.asc
> * OpenPGP_signature

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