[luatex] Detecting script

[Javier Bezos]

Hans,

> it all depends on what you want to do .. change a font
> of a glyph? that can be done in these two callbacks as
> fonts still needs to be processed then (of course one
> can also inject glues and kerns and penalties etc)
> [...]
> (so forget about the old token library approach as that
> functionality is gone)

Thank you. Therefore the short answer to my original question
is «you can't» :-).

I'll use pre_linebreak_filter then. This requires some extra effort
to create the user interface (I'd prefer something like
\everyscript{cyrillic}{\fontspec{CyrFont}}, which I think is more
transparent) and it's not as general as I'd like, but at least it
solves the basic problem.

Javier
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