Refreshing (synchronizing) values between Lua variables and TeX registers

[Jaroslav Hajtmar <hajtmar@gyza.cz>]

Hello ConTeXist and Lua experts

Is there any way to refresh values ​​between the values ​​stored in Lua 
code and TeX registers?
I need to evaluating the values of TeX registers (counters, dimensions, 
height of boxes, etc.) during the Lua cycle.
I would like in the cycle ​​read values from the TeX registers and write 
back there so that all values ​​were always synchronized.
Or I need advice on how to proceed. Most of my Lua code is in a separate 
file in Lua
function.

Is there a universal way to "jump out of cycle" to TeX synchronize all 
values ​​between TeX registers and Lua values (even at the cost of 
slowing down) and then go back into the cycle and continue?

I do not write cycles using the TeX macro language, but so far I'm 
failing in way around it.
What I need to I knowing or What I need to learn?

Thanx Jaroslav Hajtmar


The minimal example shows (maybe) what I mean:

\newcount\testcount

\def\countrefresh{\directlua{tex.count.testcount = tex.count.testcount + 1}}

\def\universalrefreshcommand{\directlua{-- ???}}

\def\printdebuginfo{
\directlua{tex.sprint(': ',tex.count.testcount, " - ", 
"\\the\\testcount","\\par")}
}

\starttext


Here values are not synchronized:

\testcount=0
\startluacode
local i=0
for i=1,5 do
tex.sprint(i)
tex.count.testcount = tex.count.testcount + 1
tex.sprint("\\printdebuginfo")
end
\stopluacode


\blank[big]

Here values of textcounter are synchronized:

\testcount=0
\startluacode
local i=0
for i=1,5 do
tex.sprint(i)
tex.sprint("\\countrefresh")
tex.sprint("\\printdebuginfo")
end
\stopluacode


\blank[big]


Is there a universal way to "jump out of cycle" to TeX synchronize all 
values ​​between TeX registers and Lua values (even at the cost of 
slowing down) and then go back into the cycle and continue?


\testcount=0
\startluacode
local i=0
for i=1,5 do
tex.sprint(i)
tex.count.testcount = tex.count.testcount + 1
tex.sprint("\\universalrefreshcommand")
tex.sprint("\\printdebuginfo")
end
\stopluacode


\blank[big]


\stoptext

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