Hi,
I uploaded a new version of lmtx and there are some experimental
features that users cna play with so that we can think about related
interfacing. (I won't mention soem in the lua department that I'm still
exploring myself.)
When you use a math symbol its class property determines the spacing.
One can use \mathopen etc to wrap such a character an dmake it behave
different. There is a new mechanism to overload that property in a
different way:
\startlines
$x\mathopen {!}+123+\mathclose {!}x$
$x\tomathopen ! +123+\tomathclose ! x$
$x\mathclose {!}+123+\mathopen {!}x$
$x\tomathclose ! +123+\tomathopen ! x$
$x ! +123+ ! x$
\stoplines
It uses a low level primitive, for the open case: \Umathclass 4 with the
number being the desired class.
A more experimental features concerns native prescripts. Consider the
following input
\blank \hbox{$
{\tf X}^1_2^^3__4 \quad
{\tf X}^1 ^^3 \quad
{\tf X} _1 __4 \quad
{\tf X} ^^3 \quad
{\tf X} __4 \quad
{\tf X}^^3 __4
$} \blank
or with the control sequence variants:
\blank \hbox{
\ruledhbox{${\tf X}\Usuperscript{a}
$}
\ruledhbox{${\tf X} \Usubscript{b}
$}
\ruledhbox{${\tf X}\Usuperscript{a}\Usubscript{b}
$}
\ruledhbox{${\tf X}\Usuperscript{a} \Usuperprescript{c}
$}
\ruledhbox{${\tf X} \Usubscript{b}
\Usubprescript{d}$}
\ruledhbox{${\tf
X}\Usuperscript{a}\Usubscript{b}\Usuperprescript{c}\Usubprescript{d}$}
\ruledhbox{${\tf X} \Usuperprescript{c}
$}
\ruledhbox{${\tf X}
\Usubprescript{d}$}
\ruledhbox{${\tf X}
\Usuperprescript{c}\Usubprescript{d}$}
}
\blank
A few days ago there was a discussion about tweaking some math
parameters, like the radical spacing. I made a macro that deals with it:
$\mathopenupparameter\Umathradicalvgap{10.5}\sqrt[3]{x}$
(this one is also in mkiv, be it slightly less efficient because in lmtx
we can use \Umathparameter to query the state of a variable)
Already present was a variant on \over which normally is used like
{{1}\over{2}}
i.e. the only time when tex looks back and needs to tweak styles. The
alternative is:
$\Uover{1}{2}$ etc
which looks forward but is otherwise compatible, apart from supporting
an optional keyword
$\Uover style \scriptscriptstyle{1}{2}$ etc
$\Uover style \textstyle{1}{2}$ etc
At some point I will adapt some context code to this.
Anyway, these are things that low level math users might like to play
with. There are few more things but those will probably go unnoticed.
Hans
-----------------------------------------------------------------
Hans Hagen | PRAGMA ADE
Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl
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