On 5 Sep 2021, at 10:14, Hans van der Meer via ntg-context <ntg-context@ntg.nl> wrote:

There is something I do not understand in the passing of parameters from TeX to LuaTex.

This is my TeX definition:

\def\ListSort[#1]#2{\directlua{hvdm.listsort([===[#2]===],[===[#1]===])}}

Calling \ListSort[sep={ + }]{} delivers the string  'sep={ + }' into LuaTeX as the printout in the logfile shows and as intended.

However in \ListSort[{ + }]{} the braces have disappeared and transferred is nothing more than ' + '.

Why is the transfer messing up the character string I am passing by removing the outer braces? Is this a bug or is it an unavoidable consequence of the TeX-LuaTeX interface?

dr. Hans van der Meer

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