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From: "Jairo A. del Rio" <jairoadelrio6@gmail.com>
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Subject: Re: About xstring and ConTeXt
Date: Tue, 7 Jul 2020 17:00:49 -0500
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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.o1@gmail.com) escribi=C3=B3:

> On Tue, Jul 7, 2020 at 6:21 PM Jairo A. del Rio <jairoadelrio6@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 happe=
n
> (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
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>
> _________________________________________________________________________=
__________
>

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<div dir=3D"ltr"><div>Yep, now it finally works. Certainly it requires a fe=
w 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, Phel=
ype and Wolfgang (I didn&#39;t know about push/popmacro either and now it&#=
39;s in my to-do readings).<br><br></div>Jairo :D<br></div><br><div class=
=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">El mar., 7 de jul. d=
e 2020 a la(s) 16:31, Phelype Oleinik (<a href=3D"mailto:phe.h.o1@gmail.com=
">phe.h.o1@gmail.com</a>) escribi=C3=B3:<br></div><blockquote class=3D"gmai=
l_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,20=
4,204);padding-left:1ex">On Tue, Jul 7, 2020 at 6:21 PM Jairo A. del Rio &l=
t;<a href=3D"mailto:jairoadelrio6@gmail.com" target=3D"_blank">jairoadelrio=
6@gmail.com</a>&gt; wrote:<br>
&gt;<br>
&gt; Thank, Wolfgang! Both methods work, but both fail with the following e=
xample:<br>
&gt;<br>
&gt; \pushmacro\unexpanded<br>
&gt; \let\unexpanded\normalunexpanded<br>
&gt; \input xstring<br>
&gt; \popmacro\unexpanded<br>
&gt; \starttext<br>
&gt; \StrGobbleLeft{bcdef}{4}<br>
&gt; \stoptext<br>
&gt;<br>
&gt; The log says:<br>
&gt;<br>
&gt; tex error &gt; tex error on line 6 in file ./tests.tex: ! This can&#39=
;t happen (prefixed command)<br>
&gt;<br>
&gt;<br>
&gt; &lt;argument&gt; \unexpanded {<br>
&gt;<br>
&gt; f}<br>
&gt;<br>
&gt; \xs_execfirst #1#2-&gt;#1<br>
&gt;<br>
&gt; However, some others work.<br>
<br>
As I said, the internals of `xstring` still use \unexpanded which, after<br=
>
you do \popmacro\unexpanded, will mean e-TeX&#39;s \protected, rather than<=
br>
\unexpanded, which are quite different.=C2=A0 To be on the safe side, you&#=
39;d<br>
need to wrap every `xstring` command in<br>
=C2=A0 =C2=A0 \pushmacro\unexpanded<br>
=C2=A0 =C2=A0 \let\unexpanded\normalunexpanded<br>
=C2=A0 =C2=A0 &lt;xstring stuff&gt;<br>
=C2=A0 =C2=A0 \popmacro\unexpanded<br>
to make sure that \unexpanded means what `xstring` expects.<br>
<br>
The *proper* way to make `xstring` work in ConTeXt would be something<br>
like Circuitikz does:<br>
=C2=A0 =C2=A0 \ifcsname normalunexpanded\endcsname<br>
=C2=A0 =C2=A0 =C2=A0 \let\pgfcircutil@unexpanded\normalunexpanded<br>
=C2=A0 =C2=A0 \else<br>
=C2=A0 =C2=A0 =C2=A0 \let\pgfcircutil@unexpanded\unexpanded<br>
=C2=A0 =C2=A0 \fi<br>
then use \pgfcircutil@unexpanded in the code, which will always have the<br=
>
same meaning.=C2=A0 That, of course, requires an update to `xstring`.<br>
<br>
Phelype<br>
___________________________________________________________________________=
________<br>
If your question is of interest to others as well, please add an entry to t=
he Wiki!<br>
<br>
maillist : <a href=3D"mailto:ntg-context@ntg.nl" target=3D"_blank">ntg-cont=
ext@ntg.nl</a> / <a href=3D"http://www.ntg.nl/mailman/listinfo/ntg-context"=
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g-context</a><br>
webpage=C2=A0 : <a href=3D"http://www.pragma-ade.nl" rel=3D"noreferrer" tar=
get=3D"_blank">http://www.pragma-ade.nl</a> / <a href=3D"http://context.aan=
het.net" rel=3D"noreferrer" target=3D"_blank">http://context.aanhet.net</a>=
<br>
archive=C2=A0 : <a href=3D"https://bitbucket.org/phg/context-mirror/commits=
/" rel=3D"noreferrer" target=3D"_blank">https://bitbucket.org/phg/context-m=
irror/commits/</a><br>
wiki=C2=A0 =C2=A0 =C2=A0: <a href=3D"http://contextgarden.net" rel=3D"noref=
errer" target=3D"_blank">http://contextgarden.net</a><br>
___________________________________________________________________________=
________<br>
</blockquote></div>

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