On Fri, 23 Oct 2015, Wolfgang Schuster wrote:

...

Aditya Mahajan mailto:adityam@umich.edu 22. Oktober 2015 um 02:52 Hi,

The following example fails:

\usemodule[pgfplots] \usepgfplotslibrary[fillbetween]

\starttext \startformula \left. a \right| \stopformula

\stoptext

with

tex error > tex error on line 7 in file /private/tmp/test.tex: ! Missing \endgroup inserted

<inserted text> \endgroup <to be read again> \Ucheckedstopdisplaymath \stopdisplaymath ...math \Ucheckedstopdisplaymath \par \ifvmode \ifcase \c_s... \strc_formulas_stop_formula ...native \v!formula } \dostoptagged \dostoptagge... l.7 \stopformula

This is a weird bug. Only \left. \right| fails; \left| \right| works correctly. If I remove the fillbetween library, the error goes away.

Any hints as to what is happening will be appreciated.

The fillbetween library changes the catcode of the bar character.

\starttext

\the\catcode`|

\usemodule[pgfplots] \usepgfplotslibrary[fillbetween]

\the\catcode`|

\stoptext

Thanks! What is the easiest way to fix this (without patching tikz)? I thought that \pushcatcodetable \usemodule[pgfplots] \usepgfplotslibrary[fillbetween] \popcatcodetable should work, but it does not. Why? Surrounding by \unprotect ... \protect does work, so I am wondering what is the difference between the two? Aditya

On Mon, 26 Oct 2015, Wolfgang Schuster wrote:

Below is a simplified version of your example where the catcode change remains even when I try to restore the default settings with \catcodetable\ctxcatcodes but I don’t now if this is a bug.

\starttext \the\catcode`| \catcode`|=12 \catcodetable\ctxcatcodes \the\catcode`| \stoptext

This works: \starttext \the\catcode`| \pushcatcodetable \catcodetable\prtcatcodes \catcode`|=12 \popcatcodetable \the\catcode`| \stoptext (Note that under \prtcatcode, the catcode of | is 12). But replacing \prtcatcodes with \ctxcatcodes does not work. So, one "proper" fix may be add a new catcodetable, say \tikzcatcodes, for all the catcode changes that tikz does. Aditya