Re: Re: nath catcode issues

[Nikolai Weibull <context-list@pcppopper.org>]

* Giuseppe Bilotta <gip.bilotta@iol.it> [Jul 05, 2004 14:00]:
> Weird indeed. I'm not using the latest ConTeXt. (Actually I'm
> quite back with the updates ... gotta get down to it.) I'll see
> if upgrading gives me the same problem and in case get a fix.

OK.

> >> \def\over{\ifmmode\n@err{Disabled command \string\over }
> >>  {No more a valid command. Replace {A \over B} with \frac A
> >>  B.}\else\o@over\fi}
> >> \def\atop{\ifmmode\n@err{Disabled command \string\atop }
> >>  {No more a valid command. Use array instead.}\else\o@atop\fi}
> >> \def\choose{\ifmmode\n@err{Disabled command \string\choose }
> >>  {No more a valid command. Replace {A \choose B} with \binom A
> >>  B.}\else\o@choose\fi}
>
> > Ah, of course...
> > 	nikolai
>
> It works like that? Excellent.

It seems I spoke too soon.  It does in fact not work.  \o@over can't be
put like that inside the if-statement.  A suggestion would be to re-work
the whole section and instead make it

\appendtoks
\def\over{\n@err{Disabled command \string\over }
 {No more a valid command. Replace {A \string\over B} with \string\frac A B.}}
\def\atop{\n@err{Disabled command \string\atop }
 {No more a valid command. Use array instead.}}
\def\choose{\n@err{Disabled command \string\choose }
 {No more a valid command. Replace {A \string\choose B} with \string\binom A B. >>> }}
\to\everymath

but I don't know if that's a good solution.  It forces you to use
\string\over in the second argument to \n@err which I don't understand
why, but otherwise TeX runs out of stack space.  I suppose it's being
expanded even though it shouldn't be.
	nikolai

--
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