[luatex] lua script on the run

[Philipp Stephani]

Am 06.01.2011 um 13:12 schrieb Khaled Hosny:

> May be you can use "process_input_buffer" callback, but this gets the
> raw input before luatex even processing it so you have to be careful
> with control sequences and so.

It is next to impossible to find out from the input where math mode is active, given the millions of possibilities to start math input.

> Or you can do the processing on the node list, but then you can't used
> regular text processing functions (gsub, lpeg, etc.)

And before you arrive at a node list, TeX will already have complained about ^ outside math mode. Probably a token_filter callback would work better.