Thanks Wolfgang, these are very valuable tips for me for the future. I put them to special document for later use. Thanks again for the valuable advice. Jaroslav Hajtmar Dne 18.3.2012 14:00, Wolfgang Schuster napsal(a):

Am 18.03.2012 um 13:48 schrieb Jaroslav Hajtmar:

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Thanx Wolfgang.

Thanks for the tip. I do too, but I did not know how to get into Lua code that the macro.

The one thing you have to know, when you pass a macro from TeX to Lua it is expanded.

\def\foo{FOO}

\directlua{myfuntion("\foo")}

In this example the Lua function gets “FOO” as input and not “\foo” because the argument of \directlua is expanded, to prevent you need a function which prevents expansion.

\directlua{myfunction("\string\foo")}

Works only for the command after \string.

\directlua{myfunction("\detokenize{\foo}")

Converts \foo into tokens and Lua sees now \foo.

\directlua{myfunction("\unexpanded{\foo}")

Prevents the argument to be expanded and Lua gets \foo (there are differences compared with \detokenize but I forgot them)

Wolfgang