Hello,
> What one would need is something like a unique group _id_, and a means
> to check whether a certain group id is dead (the group has ended) or
> not. Something like that.
Maybe a callback could be created:
function group_callback(type, where)
where "type" would denote if the group was opened/closed using
\begingroup/
\endgroup or { }, and "where" would be "before_begin", "after_begin",
"before_end", "after_end", so code could be executed inside and outside
the group. This callback could then manage group_ids as well as a stack
with all living groups:
\begingroup (id 1 => stack: 1)
\begingroup (id 2 => stack: 1 2)
\endgroup (stack: 1)
\endgroup (stack: empty)
\begingroup (id 3 => stack: 3)
...
Also, with this callback, one could create a multi-token aftergroup
(since
the \endgroup would already have been consumed, anything printed to TeX
would be inserted after the end of the group):
function group_callback(type, where)
if where == "before_end" then
-- Assume there is a toks register \aftergroupToks
tex.sprint(tex.toks["aftergroupToks"])
end
end
Example:
\begingroup
\aftergroupToks={\foo\bar}
\endgroup
% Now \foo\bar would be inserted here
Of course, catcodes would be reassigned. Maybe not what is desired.
> David Kastrup
Jonathan
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