[NTG-context] \mathopen, \Uover and friends

[Hans Hagen]

On 5/9/2020 6:29 PM, Otared Kavian wrote:
> Hi Hans,
> 
> Thanks for the quick fix of today's upload.
> I could typeset your examples with \mathopen, \mathclose and these are great features in order to fine tune the spacing in math mode.
> 
> Regarding the new command \Uover, I thought maybe it would be more consistent to have the usual structure
> ${1} \Uover {2}$
> like the more friendly ${1} \over {2}$ instead of having

That would involve backtracking and be a psin in the butt wrt control. 
One can't have it all.

> $\Uover{1}{2}$
> which is more like the \frac structure.

Watch out: these are low level primitives (it is actually a set of 
primitives that put stuff on top of each other). The \frac is the 
interfaced variant.

> Also a structure like
> $\Uover style \textstyle{1}{2}$
> seems a little bit far from the usual ConTeXt atmposphere… Would it not be possible to have
> ${1} \Uover[style=textstyle] {2}$
> instead?

That is what we have frac for (and one can define veriants that have set 
styles).

> In any case, thanks a lot for the constant addition of cute features…
Some of these engine level extensions have been on my list for a while 
and eventually make implementing the user interfaced wrappers nicer (and 
sometimes more robust). Some is actually possible because some engine 
internals are a bit reorganized.

Hans

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