On 2012-09-04 Aditya Mahajan wrote: Hi Aditya,

Instead of

context(tex.toks.mytoks)

use

context(function () context(tex.toks.mytoks) end)

See the ConTeXt Lua Document manual for explanation.

Thanks. This works indeed. But what to do in the following case? It's hard to find a proper wording for this problem which makes searching on the net or in the documentation difficult. \starttext \def\cmd {\newdimen\mydimen \mydimen=50pt} \startluacode context.cmd() if tex.dimen.mydimen < tex.dimen.textwidth then context("is smaller") else context("is not smaller") end \stopluacode \stoptext

...

Is there a way to access the contents of the macro from within Lua like counters and token registers?

[…]

AFAIK, this is not possible.

Thanks. Marco

On 2012-09-04 Martin Schröder wrote: Hi Martin,

http://tracker.luatex.org/view.php?id=682

It seems that I just hit a very hard to solve issue which needs not yet available support from the luatex side. Patricks solution seems not very practical and error prone, so I settled with this ugly but still readable workaround: \def\cmd {\newdimen\mydimen \mydimen=50pt} \starttexdefinition action \cmd \startluacode if tex.dimen.mydimen < tex.dimen.textwidth then % context("is smaller") else % context("is not smaller") end % \stopluacode \stoptexdefinition \action Marco

On 2012-09-04 Wolfgang Schuster wrote:

Is there a good reason why you put \newdimen because dimen/count etc. registers should always be defined once.

The definitions are not in a macro, they are defined at the top of the file. I messed around while creating a minimal example. However, the problem remains the same since the assignment does not happen within Lua. But, thanks for the hint. I am always happy for improvements and feedback about my code. Marco

On 2012-09-04 Wolfgang Schuster wrote:

What prevents you from setting the dimen value in Lua?

Some background: The code is part of a smarter float placement. It takes the size of the float into account and decides for a location. For example, it positions the float in the margin if it fits or it prints the caption underneath the float if the float spans the margin as well (captions are in the margin by default in this layout). Most of the code is written in TeX and I don't feel it's necessary to rewrite it in Lua. I am more fluent in TeX than in Lua. In this case a TeX helper function computes the size and saves the results in dimen registers. I use Lua for calculations especially when it comes to dimensions. It's a nightmare in TeX and hard to find errors easily creep in. Marco

On 2012-09-05 Hans Hagen wrote: Hi Hans,

you probably over code things

Yes, that's not unlikely, I tend to do that (unintentional).

instead of storing you can pass the valus directly

\def\largerthantextwidth#1% {\cldcontext {if \number\dimexpr#1

This code does not work for me, but I get the idea of injecting macro parameters into the Lua code. Marco