Thanks, but I'm not able to run this code in my system.

I'm working in ConTeXt  ver: 2014.12.06 14:20 MKIV beta  fmt: 2014.12.8
 int: english/english

and the error message is:


>> runscript
! Isolated expression.
<to be read again>
                   (
mlib_luas_luacall->begingroup.runscript(

""for.s=(TEXT2):if.string.s:&s.elsei...

lua->..._s,(TEXT3))else:mlib_luas_luacall((TEXT3))
                                                  fi.endgroup
<*> ...lua("mp.print(#document.variables.labels)")
                                                   : b[i] = unitsquare
xscal...

! Extra tokens will be flushed.
<to be read again>
                   (
mlib_luas_luacall->begingroup.runscript(

""for.s=(TEXT2):if.string.s:&s.elsei...

lua->..._s,(TEXT3))else:mlib_luas_luacall((TEXT3))
                                                  fi.endgroup
<*> ...lua("mp.print(#document.variables.labels)")
                                                   : b[i] = unitsquare
xscal...

>> vacuous
! Improper final value has been replaced by 0.
<to be read again>
                   :
<*> ...a("mp.print(#document.variables.labels)") :
                                                   b[i] = unitsquare
xscaled...


2014-12-08 9:21 GMT+00:00 Hans Hagen <pragma@wxs.nl>:

> On 12/7/2014 8:25 PM, DesdeChaves wrote:
>
>>
>> I would like to pass the lua table keys and values to metapost. In the
>> keys i have information about the paths names and in the values i have
>> information about the label that should be draw in the center of each
>> path (unitsquare).
>>
>> In my code (see attach) the table in question is
>> "weekdays_number_and_name".
>>
>> I know that is possible to pass a array from metapost to lua. Is the
>> reverse possible?
>>
>
> it's possible to ask values from within mp:
>
> \starttext
>
> \startluacode
> document.variables = {
>     labels = {
>         "one",
>         "two",
>         "three",
>     }
> }
> \stopluacode
>
> \startMPpage
>     numeric dx, dy;
>     dx = 4.4cm;
>     dy = 0.53cm;
>     path b[];
>     for i=1 upto lua("mp.print(\#document.variables.labels)") :
>         b[i] = unitsquare xscaled dx yscaled dy shifted (0, (i-1)*dy);
>         draw b[i];
>         label(lua("mp.quoted(document.variables.labels[" & decimal i &
> "])"), center b[i]);
>     endfor
> \stopMPpage
>
> \stoptext
>
>
> -----------------------------------------------------------------
>                                           Hans Hagen | PRAGMA ADE
>               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
>     tel: 038 477 53 69 | voip: 087 875 68 74 | www.pragma-ade.com
>                                              | www.pragma-pod.nl
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-- 
Atentamente

DesdeChaves