[NTG-context] Typing within doifmode leads to error

Christoph Reller christoph.reller at gmail.com
Fri Mar 19 07:59:32 CET 2021


On Fri, Mar 19, 2021 at 5:38 AM Aditya Mahajan <adityam at umich.edu> wrote:

> On Fri, 19 Mar 2021, Christoph Reller wrote:
>
> > Consider the following MWE:
> >
> > \definetyping[T]
> > \definemode[mode][yes]
> > \starttext
> > \doifmode{mode}{%
> >   \startT
> >     Bla
> >   \stopT}
> > \stoptext
> >
> > Compilation with the currently latest ConTeXt LMTX (ver: 2021.03.17 17:46
> > LMTX  fmt: 2021.3.18) fails with:
> >
> > tex error       > runaway error: end of file encountered
> > mtx-context     | fatal error: return code: 1
> >
> > Compilation is successful if I replace doifmode{mode}{...} by
> > \startmode[mode]...\stopmode.
>
> Has to be with how tex works. The argument of any macro
> (\doifmode{mode}{...} in this case) is scanned under the current catcode
> regime. So, any environment (like typing) which changes catcodes does work
> inside the argument to another macro.
>

I see. Strangely, the MWE did work in older versions of ConTeXt ;-)


> So, either use the environment version of \doifmode (which doesn't
> _capture_ it content):
>
> \definetyping[T]
> \definemode[mode][yes]
> \starttext
> \startmode[mode]
>   \startT
>     Bla
>   \stopT
> \stopmode
> \stoptext
>
> Or use buffers (to avoid catcode all together):
>
> \definetyping[T]
> \definemode[mode][yes]
> \starttext
> \startbuffer[code]
> \startT
>     Bla
> \stopT
> \stopbuffer
>
> \doifmode{mode}{\getbuffer[code]}
> \stoptext
>
> or (note type**T**buffer so that the output is formatting according to the
> options of \definetyping[T])
>
> \definetyping[T]
> \definemode[mode][yes]
> \starttext
> \startbuffer[code]
>     Bla
> \stopbuffer
>
> \doifmode{mode}{\typeTbuffer[code]}
> \stoptext
>
> Perhaps this should be added to the FAQ on the wiki.
>
> Aditya
>

 Thank you for your ultra-speedy and very helpful response!

Christoph
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