Finding values ​​of the context macros inside Lua functions (=expansion inside Lua functions?)

[Jaroslav Hajtmar <hajtmar@gyza.cz>]

Hello all,

For several hours trying to find solutions of problem.

My minimal example (I mention it at the end of email)  for clear reasons 
show, that :

7 is not number.
7 is number.
7is not number.
7is not number.


In the first is argument '\value' negotiable to the value, in second it 
is not possible (but for clear reasons too).

I would need to find from  argument ie macro '\\value'  in the LUA 
function its numerical value.
Is there any function that would do that?

I need something as a function of context (...), which would, however, 
its output is not located into ConTeXt, but its result get to back to a 
Lua function or into variable.
It is something like the expansion of an existing ConTeXt macro to its 
value.

Thanx Jaroslav


Here is my minimal example:

\startluacode
function test(arg)

   if type(arg)=='number' then
     context(arg.." is number.\\par ")
   else
     context(arg.." is not number.\\par")
   end

   if type(tonumber(arg))=='number' then
     context(arg.." is number.\\par ")
   else
     context(arg.." is not number.\\par")
   end
end

\stopluacode


\starttext
   \def\value{7}

   \ctxlua{test('\value');}

   \blank[big]

   \ctxlua{test('\\value');}

\stoptext




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