On 7/28/2021 7:24 PM, Thomas A. Schmitz via ntg-context wrote:
> Hi all,
> 
> just two quick questions: a couple of weeks ago, there was a long 
> discussion on ligature exceptions in, e.g., German. Hans provided an 
> elegant new mechanism (\startlanguageoptions). So my two questions:
> 
> 1. Is the old mechanism (\replaceword[eg][Auflage][Au{fl}age]) now 
> obsolete? I tried using it, but unwanted ligatures still occurred. If it 
> is indeed deprecated, I'll add a note to the wiki (this would mean that 
> the current texlive version does not have the new mechanism and the 
> latest lmtx doesn't use the old one, so that's somewhat problematic).

it's not too hard to make it work, see attached, but the new one is 
nicer because it permits more detailed control

in luametatex you can do things like

Au{\norightligaturing f}lage

that is: each character can have a set of options; ok, one can do that 
with attributes but that is less efficients options have been introduced 
for ligatures, kerns, expansion etc (you can diff the attached lmt file 
with the lua file of the same name to see the difference in approach

> 2. Both mechanisms only work for complete words, is that right? So I 
> can't just provide a pattern such as "uf|forder," I have to provide a 
> full list with all inflected forms:
> 
> auf|fordern
> auf|fordert
> auf|fordernd
> Auf|forderung
> Auf|forderungen
> 
> and for 1-3 also the forms with a capital letter.

just lowercase will do

if you look at the example files you can see that there are pre/post 
snippets possibel so basically you can create something

pre [a|b|c] post

which saves some definitions (make we can have pre/post lists which will 
nicely explode into huge lists but memory is not the issue here)

while the replacement works by running over the node list, the second 
mechanism is using a callback at the hyphenation level (so per language) 
where each word is anyway checked against an exception list, so in 
addition that word can now be fed into a function and depending on 
outcome be fed back into the machinery

(there are trackers that give insight in the process)

Hans

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