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Re: Srfi-159/166 - monadic formatting for guile

From: Linus Björnstam
Subject: Re: Srfi-159/166 - monadic formatting for guile
Date: Sun, 16 Jun 2019 22:30:06 +0200
User-agent: Cyrus-JMAP/3.1.6-663-gf46ad30-fmstable-20190607v1

Well, in the written-shared/pretty-shared case, Alex Shinn (I just ported his 
reference implementation) relies on display/write for everything except lists 
and vectors, and those are, from what I can tell, exhaustively checked for 

trimmed/lazy I have to have a read through in some other way than 
black-on-white text on my 3.5" phone. 

Best regards

  Linus Björnstam

On Sun, 16 Jun 2019, at 08:37, Mark H Weaver wrote:
> Hi Linus,
> Linus Björnstam <address@hidden> writes:
> > I am not sure I understand what you mean, but i suspect it is already
> > solved, since for simple cases show will use display/write. So unless
> > you try to do advanced formatting of circular lists it will do
> > whatever display or write does. The same thing goes for custom
> > printers.
> How do you implement 'written-shared', 'pretty-shared', and
> 'trimmed/lazy'?  In particular, how do you avoid non-termination when
> asked to print cyclic data, when the cycle includes a non-standard data
> type printed using a custom printer?  For example, what if you print a
> list that includes an object whose custom printer will print output that
> includes the same list that you started with?
>      Regards,
>        Mark

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