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


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