Refreshing (synchronizing) values between Lua variables and TeX registers

* Refreshing (synchronizing) values between Lua variables and TeX registers
@ 2012-06-18 13:02 Jaroslav Hajtmar
  2012-06-18 14:20 ` Hans Hagen
  0 siblings, 1 reply; 2+ messages in thread
From: Jaroslav Hajtmar @ 2012-06-18 13:02 UTC (permalink / raw)
  To: mailing list for ConTeXt users

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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