Yep, now it finally works. Certainly it requires a few more lines. I was
going to rewrite some TikZ code which was too dependent on LaTeX and
xstring was the last stone on the shoe. Thank you a lot, Phelype and
Wolfgang (I didn't know about push/popmacro either and now it's in my to-do
readings).
Jairo :D
El mar., 7 de jul. de 2020 a la(s) 16:31, Phelype Oleinik (
phe.h...@gmail.com) escribió:
> On Tue, Jul 7, 2020 at 6:21 PM Jairo A. del Rio <jairoadelr...@gmail.com>
> wrote:
> >
> > 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.
>
> As I said, the internals of `xstring` still use \unexpanded which, after
> you do \popmacro\unexpanded, will mean e-TeX's \protected, rather than
> \unexpanded, which are quite different. To be on the safe side, you'd
> need to wrap every `xstring` command in
> \pushmacro\unexpanded
> \let\unexpanded\normalunexpanded
> <xstring stuff>
> \popmacro\unexpanded
> to make sure that \unexpanded means what `xstring` expects.
>
> The *proper* way to make `xstring` work in ConTeXt would be something
> like Circuitikz does:
> \ifcsname normalunexpanded\endcsname
> \let\pgfcircutil@unexpanded\normalunexpanded
> \else
> \let\pgfcircutil@unexpanded\unexpanded
> \fi
> then use \pgfcircutil@unexpanded in the code, which will always have the
> same meaning. That, of course, requires an update to `xstring`.
>
> Phelype
>
> ___________________________________________________________________________________
> 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
>
> ___________________________________________________________________________________
>
___________________________________________________________________________________
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
___________________________________________________________________________________
