Re: Creating TeX dimensions and counters registers directly in Lua

[Jaroslav Hajtmar <hajtmar@gyza.cz>]

Thank to Hans and Peter too.
It works in context fine now. I would like realize this same in pure LuaTeX.

I was primarily in the query for it to find Lua equivalent of TeX 
primitives \newdimen and  \newcount (for direct creating new TeX registers)
I could use something like "\directlua{tex.newdimen.mydimen}" that would 
create TeX register "mydimen" and then 
\directlua{tex.dimen.mydimen=200*2^16} which set value of register and 
that should be present in TeX for direct use such as "\the\mydimen" etc.
I apologize for my naivete :-).

Of course, I did not think that the global variable is magically changed 
the registry value, I just did not know how to implement it.
Plus, I had in mind that ConTeXt conversion functions do not work in a 
clean LuaTEX (without reading about some library functions).


One more thanx.
Jaroslav


Here is my pure luatex example. Is there any easy way?

\newdimen\mytexdimension
\mytexdimension 100pt

mytexdimension: .\hbox to\mytexdimension{\the\mytexdimension}.

\directlua{tex.myluadimension = "200pt"}

myluadimension: .\hbox to 
\directlua{tex.print(tex.myluadimension)}{\directlua{tex.print(tex.myluadimension)}}.

\directlua{tex.dimen.mytexdimension = "300pt"}

mytexdimension: .\hbox to\mytexdimension{\the\mytexdimension}.

\def\myluadimension{\directlua{tex.print(tex.myluadimension)}}

myluadimension: .\hbox to\myluadimension{\myluadimension}.

\bye



Dne 22.8.2012 12:32, Hans Hagen napsal(a):
> On 22-8-2012 11:09, Jaroslav Hajtmar wrote:
>> Thanks Wolfgang for the reply,
>> but I must have misunderstood. My point is, that TeX registers was
>> subsequently visible and usable in TeX (eg for width or height of boxes,
>> etc.)
>>
>> Eg. for example, \the\mydimension can see that this does not occur!
>> In addition, I solve the problem at LuaTEX, so ConTeXt converting
>> functions do not work etc. ..
>>
>> Thanx Jaroslav
>>
>> Here is another example:
>>
>> \starttext
>>
>> \newdimen\mytexdimension
>> \mytexdimension=100pt
>>
>>
>> \ctxlua{myluadimension = number.topoints(10000)}
>> \ctxlua{context(myluadimension)}
>>
>> \the\mytexdimension
>> \hbox to\mytexdimension{XXXXX}YYYY
>>
>> % FAILS
>> %\the\myluadimension
>> %\hbox to\myluadimension{XXXXX}YYYY
>
> Of course that fails: why should the globally defined
> lua variable "myluadimension" magically become a \dimen
> register at the tex end? And believe it or not, the context
> conversion function do work, else mkiv wouldn't work.
>
>> \stoptext
>
> Here is the right code:
>
> \starttext
>
> \newdimen\mytexdimension \mytexdimension 100pt
>
> \ruledhbox to\mytexdimension{\the\mytexdimension}
>
> \ctxlua{document.myluadimension = "200pt"}
>
> \ruledhbox to 
> \cldcontext{document.myluadimension}{\cldcontext{document.myluadimension}} 
>
>
> \ctxlua{tex.dimen.mytexdimension = "300pt"}
>
> \ruledhbox to\mytexdimension{\the\mytexdimension}
>
> \stoptext
>
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