From: "Jairo A. del Rio" <jairoadelrio6@gmail.com>
To: mailing list for ConTeXt users <ntg-context@ntg.nl>
Subject: Re: About xstring and ConTeXt
Date: Tue, 7 Jul 2020 16:21:03 -0500 [thread overview]
Message-ID: <CAKyqqaZsp5itK6S0uZhp8ySzE_phJiMTyc0pV2dnSZ7Ncy_YdQ@mail.gmail.com> (raw)
In-Reply-To: <60da2635-f431-79fb-cacc-91847903a826@gmail.com>
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Thank, Wolfgang! Both methods work, but both fail with the following
example:
\pushmacro\unexpanded
\let\unexpanded\normalunexpanded
\input xstring
\popmacro\unexpanded
\starttext
\StrGobbleLeft{bcdef}{4}
\stoptext
The log says:
tex error > tex error on line 6 in file ./tests.tex: ! This can't happen
(prefixed command)
<argument> \unexpanded {
f}
\xs_execfirst #1#2->#1
However, some others work.
El mar., 7 de jul. de 2020 a la(s) 15:20, Wolfgang Schuster (
wolfgang.schuster.lists@gmail.com) escribió:
> Phelype Oleinik schrieb am 07.07.2020 um 20:53:
> > Hi Jairo,
> >
> > ConTeXt's \unexpanded is e-TeX's \protected, so the error boils down to
> > something like: \edef\x{\unexpanded{#}}, which works in Plain but not in
> > ConTeXt.
> >
> > Usually packages that claim to be generic have to cope with that.
> > xstring would need to do (in a ConTeXt-specific loader):
> > \let\xstring@unexpanded\normalunexpanded
> > and
> > \let\xstring@unexpanded\unexpanded
> > in Plain and LaTeX loaders, then then use \xstring@unexpanded in the
> > code. But `xstring` doesn't claim (that I found, at least) to be
> > compatible with ConTeXt, so it's understandable: though if it is
> > compatible with Plain, it wouldn't be hard to adapt to ConTeXt.
> >
> > That said, you can load `xstring` if you do:
> > \let\unexpanded\normalunexpanded
> > \input xstring.tex
> > \let\unexpanded\protected
> > but the internals of the package will probably be comprimised by the
> > misuse of (ConTeXt) \unexpanded.
>
> Bad idea because ConTeXt also changes the meaning of \protected (you can
> use \normalprotected to get the primitve).
>
> A better version is
>
> \pushmacro\unexpanded
> \let\unexpanded\normalunexpanded
> \input xstring
> \popmacro\unexpanded
>
> Wolfgang
>
> ___________________________________________________________________________________
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>
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___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!
maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage : http://www.pragma-ade.nl / http://context.aanhet.net
archive : https://bitbucket.org/phg/context-mirror/commits/
wiki : http://contextgarden.net
___________________________________________________________________________________
next prev parent reply other threads:[~2020-07-07 21:21 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-07 18:40 Jairo A. del Rio
2020-07-07 18:53 ` Phelype Oleinik
2020-07-07 20:08 ` Jairo A. del Rio
2020-07-07 20:19 ` Wolfgang Schuster
2020-07-07 20:25 ` Phelype Oleinik
2020-07-07 21:21 ` Jairo A. del Rio [this message]
2020-07-07 21:30 ` Phelype Oleinik
2020-07-07 22:00 ` Jairo A. del Rio
2020-07-08 10:15 ` Hans Hagen
2020-07-08 17:47 ` Hans Hagen
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