On 3/6/2018 4:43 AM, Bruno Le Floch wrote:
On 03/05/2018 12:00 PM, Hans Hagen wrote:
On 3/5/2018 5:08 PM, a...@linux.pl wrote:
Hello,

Anybody know how I can set variable in tex?

For example

\count10=20
\def\proste{To jest prosty napis}
   a\directlua{tex.print(tex.count[10]+5)}b
   a\directlua{tex.set("\proste","Trudne")}b
\proste
\bye

I need setup \proste definition to my own string

How I can read TeX variable \mynumber from lua
and set variable \mynumber on TeX but set in lua script.

\starttext

\newcount\MyCount \MyCount = 20

\def\MyMacro{To jest prosty napis}

a\directlua{tex.print(tex.getcount("MyCount")+5)}b

a\directlua{token.set_macro("MyMacro","Trudne")}b

\MyMacro

\stoptext



Interestingly, token.set_macro allows defining macros whose replacement
text has unbalanced braces.

\directlua{token.set_macro("MyMacro", "\string{")}
\expandafter\show\MyMacro
\bye

Indeed. No expansion and parsing is involved except for one level checking of catcodes and tokens.

This function is mostly there for simple usage like storing a string or so (no support for parameters etc).

A bit like:

\edef\foo{\noexpand\scantextokens{\string{}}
\edef\oof{\noexpand\scantextokens{\string}}}

test \foo\bf bar\oof\ test

Hans

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