[luatex] Detecting script

[Javier Bezos]

>>>>> I think pre_linebreak_filte is too late and
...
>>>> hpack_filter is probably the place you want
>>
>> It works at the node level and apparently it doesn't work at the
>> outer horizontal mode, only hboxes. I want something at the token
>> level.
>
> it helps to read the manual -)
>
> pre_linebreak_filter

And also to read the original post :-). As I said, I think 
pre_linebreak_filter is too late (I made some tests with it
before posting my question). Like hpack_filter it works at
the node level and I don't see how to inject TeX code.

Javier