On 5/27/2025 7:23 AM, Linas Stonys wrote:
I think it is a bug. Luatex tries to expand data field content like with
\edef thats why you get \iffalse.
With older texlive (v0.76) the same example prints:
we now have luatex 1.12 so that is indeed old ... way too old to bother
about here
table: 03420800
table: 034212F0
table: 03421318
\documentclass{article}
\begin{document}
\directlua{
callback.register('vpack_filter',
function(head)
if node.type(head.id) == 'whatsit' and head.subtype == 1 then
print (head.data)
end
return true
end,
'debug'
)
}
\begin{figure}
\caption{test}
\end{figure}
\end{document}
On 5/17/2025 1:54 PM, Josef Friedrich wrote:
I’m the maintainer of the nodetree package. I got a bug report:
https://github.com/Josef-Friedrich/nodetree/issues/46
I was able to narrow down the problem:
debug.tex:
\documentclass{article}
\begin{document}
\directlua{
luatexbase.add_to_callback('vpack_filter',
function(head)
if node.type(head.id) == 'whatsit' and head.subtype == 1 then
local tmp = head.data
end
return true
end,
'debug'
)
}
\begin{figure}
\caption{test}
\end{figure}
\end{document}
lualatex debug.tex:
! Incomplete \iffalse; all text was ignored after line 19.
<inserted text>
\fi
l.19 \end{figure}
The line 'local tmp = head.data' causes the error. I tried also
'print(head.data)' or 'local tmp = head['data']'. These access types
also caused a crash.
Access to fields other than data works without any problems.
print(head.stream)
print(head.id)
print(head.xxx)
Is this a bug in LuaTeX? Or how can I access the field 'data' of a
whatsit(write) node for debugging purposes?
A tex error is not a crash and normally not a bug either. I suggest you
look into what the "data" field gets set to which is unclear from your
example.
\directlua{
callback.register('vpack_filter', function(head)
if node.type(head.id) == 'whatsit' and head.subtype == 1 then
print(head.data)
end
return true
end)
}
\def\hello{\iftrue true\else false\fi}
\def\world{\iftrue true\else false\fi}
\protected\def\HELLO{\iftrue TRUE\else FALSE\fi}
\protected\def\WORLD{\iftrue TRUE\else FALSE\fi}
\noindent \directlua{
local n = node.new("whatsit",1)
n.data = [[(\hello\world)(\HELLO\WORLD)]]
print(n.data)
tex.print(n)
}
test test test
\bye
So maybe use \tracingall in your latex example code to get an idea what
is going on?
Hans
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