The problem with vertical spacing in \frac and \over is fixed. Many thanks,
Hans!
Alan
On Wed, Jun 10, 2020 at 4:03 AM Hans Hagen <j.ha...@xs4all.nl> wrote:
> Hi,
>
> I uploaded a new version. There have been no changes to the typesetting
> machinery although we're still in the process of finetuning some updated
> low level macros. There was a fix in the font machinery (thanks to Kai)
> but that will probably go unnoticed as the issue has been there for years.
>
> Now, that doesn't mean that nothing has been changed. First of all there
> is a new data related mechanism. After Wolfgang had updated the
> definition files it became official. It was on the agenda for a while
> but finally a nice solution surfaced.
>
> The new thing is luatables that obey grouping. Normally what you do at
> the lua end is kind of global, but there can be cases where you really
> want it to behave like tex: obeying \bgroup/\egroup, { } etc. The
> examples given below show that you can create them at the tex end and
> access them in tex as well as lua.
>
> \starttext
>
> \dorecurse {100} {
> \setdatavalue{#1}{#1}
> }
>
> \start \tttf \darkred \raggedright \dorecurse {100} {
> #1=\scratchcounter\getdatavalue{#1}\the\scratchcounter
> } \par \stop \blank
>
> \start \tttf \darkgreen \raggedright \dorecurse {100} {
> #1=\thedatavalue{#1}%
> } \par \stop \blank
>
> \bgroup \tttf
> \newluatable\testtable
> \setluatable\testtable{ foo = 123, bar = "456", oof = "rab" }
> % \inspectluatable\testtable
> \darkblue
> foo = \getfromluatable\testtable{foo}\par
> bar = \getfromluatable\testtable{bar}\par
> oof = \getfromluatable\testtable{oof}\blank
> \bgroup
> \useluatable\testtable
> \setluatable\testtable{ foo = 123123, bar = "456456" }
> % \inspectluatable\testtable
> \darkmagenta
> foo = \getfromluatable\testtable{foo}\par
> bar = \getfromluatable\testtable{bar}\par
> oof = \getfromluatable\testtable{oof}\blank
> \startluacode
> local t = context.luatables.get("testtable")
> print(t.foo,t.bar,t.oof)
> \stopluacode
> \egroup
> \darkyellow
> foo = \getfromluatable\testtable{foo}\par
> bar = \getfromluatable\testtable{bar}\par
> oof = \getfromluatable\testtable{oof}\blank
> \startluacode
> local t = context.luatables.get("testtable")
> print(t.foo,t.bar,t.oof)
> \stopluacode
> % \inspectluatable\testtable
> \egroup
>
> \bgroup \tttf
> \newluatable\moretable
> \setluatable\moretable{ 1, "foo" }
> \darkblue
> [1] = \getfromluatable\moretable{1}\par
> [2] = \idxfromluatable\moretable 2 \blank
> \bgroup
> \useluatable\moretable
> \setluatable\moretable{ foo = 123123, bar = "456456" }
> \darkmagenta
> [1] = \getfromluatable\moretable{1}\par
> [2] = \idxfromluatable\moretable 2 \blank
> \startluacode
> local t = context.luatables.get("moretable")
> print(t[1],t[2])
> \stopluacode
> \egroup
> \darkyellow
> [1] = \getfromluatable\moretable{1}\par
> [2] = \idxfromluatable\moretable 2 \blank
> \startluacode
> local t = context.luatables.get("moretable")
> print(t[1],t[2])
> \stopluacode
> \egroup
>
> \stoptext
>
> This is only available in lmtx (until i see a real reason to cook up an
> alternative for mkiv, which is unlikely as no context code depends on
> this being available, at least not now). The datavalue macro you see
> there can be used to create massive amounts of numeric variable
> independent of counters, not that we really need it, but it was very
> cheap to implement.
>
> At the engine level there also have been some changes but these should
> not be visible for users. We just mention:
>
> - extensions to the macro definition and expansion mechanisms (for
> instance optional arguments, optional delimiters, and silent error
> recovery; there will be some explanation in the evenmore document and at
> some point - when stable - in the manual) .. this permits some cleaner
> low level code; only things were done that had no impact on performance
> (as macro definition and expansion is used a lot) and didn't make the
> code messy (it actually became cleaner)
>
> - some additional substring (ok, tex has no string, just tokens) parsing
> capabilities with optional tokens, which again permits a bit cleaner low
> level code
>
> - a slightly reorganized handling of tokens (one of tex's basic data
> structures) in the lua token interface so that we get a more meaningful
> and robust subsystem (basically getting rid of funny numbers) ... this
> also will be discussed in an evenmore chapter .. not that users need it
> (i think)
>
> - as a side effect (or necessity) some low level recoding (and
> abstraction) had to happen but as far as we can see it works ok (i admit
> it was a slow, tedious job with lots of intermediate testing on the
> suite to make sure nothign was broken) .. in the end it was all doable
> because most of the preparation was already done over the last years
>
> - in the process we got rid of a traditional tex data structure that was
> left over from the 32 bit times but no longer needed in our 64 bit
> luatex/luametatex universe (i might backport that simplification to
> luatex some day) ... it discards some checking and saves the same amount
> of memory that we had on the early day pc's (where we ran whole tex jobs
> in that amount)
>
> Of course ... all kind of small improvenments ... hopefully for the best,
>
> 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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