2010/5/13 Vianney le Clément :

On Thu, May 13, 2010 at 09:30, Taco Hoekwater wrote:

...

Like many of the more complex commands, \processaction does not expand totally. If you are using mkiv, you could define \Shape like this:

\def\Shape#1%  {\directlua{     local known = {square = 'unitsquare', circle = 'unitcircle' }     tex.sprint(known[#1] or 'unitsquare')}}

Thanks Taco. That does the trick provided you enclose #1 with quotes:

\def\Shape#1%  {\directlua{    local known = {square = 'unitsquare', circle = 'unitcircle' }    tex.sprint(known['#1'] or 'unitsquare')}}

Another, maybe uglier but plain TeX, solution I've come up with is defining auxiliary macros:

\def\ShapeSSSsquare{unitsquare} \def\ShapeSSScircle{unitcircle} \def\Shape#1{\csname ShapeSSS#1\endcsname}

But of course, this does not handle unknown options (though that could be added).

I'll add this to the wiki.

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Also \getparameters[Shape][square={unitsquare }, circle={unitcircle }] \starttext \startuseMPgraphic{test} fill \Shapesquare scaled 1cm; \stopuseMPgraphic \useMPgraphic{test} \stoptext %%%%%%%%%%%%%% \setevalue{square}{unitsquare} \setevalue{circle}{unitcircle} \starttext \startuseMPgraphic{test} fill \getvalue{square} scaled 1cm; \stopuseMPgraphic \useMPgraphic{test} \stoptext -- luigi

\getparameters[Shape][square={unitsquare },                     circle={unitcircle }] \starttext

\startuseMPgraphic{test} fill \Shapesquare  scaled 1cm; \stopuseMPgraphic \useMPgraphic{test} \stoptext

This one's very nice. Thanks. Vianney

becareful at the spaces at the end, ie \getparameters[Shape][square={unitsquare},                    circle={unitcircle}]

doesn't work.

That's logical, because \Shapesquare eats the spaces following it. In my case, I define my macros like \getparameters[Shape:] [square=unitsquare, circle=unitcircle] \def\Shape#1{\csname Shape:#1\endcsname} and then use \Shape{square}, so it doesn't have the problem. But thanks for pointing that out. Vianney