Re: Refreshing (synchronizing) values between Lua variables and TeX registers

[Hans Hagen <pragma@wxs.nl>]

On 18-6-2012 15:02, Jaroslav Hajtmar wrote:
> 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

sure, as the 'prints' end up in the input buffer and are dealt with 
after the lua code has been dealt with; at some point we can have 
coroutines for going back and forth

in your case I'm not sure what is the problem as you can set the valus 
at the lua end and print the current value when needed

>
> \blank[big]
>
>
> \stoptext
>
> ___________________________________________________________________________________
>
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>
> maillist : ntg-context@ntg.nl /
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> ___________________________________________________________________________________


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If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
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