On 24 Oct 2019, at 13:10, Linas Stonys <lsto...@vtex.lt> wrote:
>
> Hi,
> I noticed that whatsit subtype "write" has changed "data" field type.
> Documentation says "data -> table representing the token list to be written"
> but when I print it I see it as a string with LuaTeX, Version 1.10.0 (TeX
> Live 2019):
> HERE <node 277 < 82 > nil : whatsit 1> \foo\fee
>
> With LuaTeX, Version 1.07.0 (TeX Live 2018/W32TeX) is ok:
> HERE <node 276 < 82 > nil : whatsit 1> table: 02D87EC8
>
>
> Minimal example:
> \write1{\string\foo \unexpanded{\fee}}%
> \directlua{
> local head = tex.nest[tex.nest.ptr].head
> local tl = node.tail(head)
> print ("HERE", tl, tl.data)
> }
> \bye
>
>
> The real world example will be:
> \documentclass{article}
> \usepackage[color=no]{nodetree}
> \nodetreeoption[channel]{log}
> \nodetreeregister{preout} % pre_output will rise an error trying to
> print whatsits data field
>
> \begin{document}
> \makeatletter
> \protected@write \@auxout {}{\string\@gobble\string\fee} %% this is ok
> \protected@write \@auxout {}{\string\@gobble\protect\foo} %% but this will
> rise \foo undefined error
> \makeatother
> \end{document}
>
> And this is very strange that accessing whatsits (subtype "write") "data"
> field executes it.
The reason is that function get_write_direct_value (lnodelib.c:1652) provides
expanded tokenlist version
by function expand_macros_in_tokenlist (lnodelib.c:1652; defined in
extensions.c:512).
Maybe a bit changed behaviour with providing unexpanded tokenlist be more
useful and flexible working with
whatsit data from lua side. In such case minimal changes could be: to use by
get_write_direct_value a modified
version of expand_macros_in_tokenlist with different token scan changed from
scan_toks(false, true) to
scan_toks(false, false) (extensions.c:541).
Regards,
Sigitas
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