parameters TeX->LuaTeX

parameters TeX->LuaTeX

[Hans van der Meer via ntg-context]

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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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Re: parameters TeX->LuaTeX

[Hans van der Meer via ntg-context]

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And \ListSort[[abc]]{value} turns out to be worse: doesn't makes it into LuaTeX at all.
dr. Hans van der Meer


> 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
> 
> 
> ___________________________________________________________________________________
> If your question is of interest to others as well, please add an entry to the Wiki!
> 
> maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
> webpage  : http://www.pragma-ade.nl / http://context.aanhet.net
> archive  : https://bitbucket.org/phg/context-mirror/commits/
> wiki     : http://contextgarden.net
> ___________________________________________________________________________________


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___________________________________________________________________________________

Re: parameters TeX->LuaTeX

[Hans Hagen via ntg-context]

On 9/5/2021 10:14 AM, Hans van der Meer via ntg-context 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]===])}}

tex haalt de {} rond #2 weg

> 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?
\starttext
     \def\foo#1{\detokenize{#1}} \foo{hvdm has to read the tex book}

     \def\foo#+{\detokenize{#1}} \foo{hvdm has to read the luametatex 
manual}
\stoptext


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