Goebel, Juergen wrote:
> Hi,
>
> Regarding the following example I've got two questions.
>
> (1) Why don't I ever see the argument #2 in the output?
> (2) What do I have to do to suppress the unwanted space
> after the end of the output of this macro (as can be seen
> in the result before the following comma)?
>
> Regards,
>
> Juergen
>
>
> \def\Geb{\dosingleempty\doMyGeb}
> \def\doMyGeb[#1]#2#3{, x %
> \iffirstargument%
> Aha
> \else
> \ifsecondargument%
> #2
> \else%
> ... %C%
> \fi
> \fi
> \ifthirdargument%
> #3%
> \else%
> ...%
> \fi}
>
> \starttext
>
> \Geb{Ulm}{11. 9. 2008} % should deliver x Ulm 11. 9. 2008
> \Geb[Ulm]{Ulm}{11. 9. 2008} % should deliver x Aha Ulm 11. 9. 2008
> \Geb{}{11. 9. 2008} % should deliver x ... 11. 9. 2008
> \Geb{Ulm}{} % should deliver x Ulm ...
> \Geb{}{} % should deliver x ...
>
> \stoptext
\unexpanded\def\Geb{\dosingleempty\doMyGeb}
\def\doMyGeb[#1]#2#3%
{, x \iffirstargument Aha \fi
\doifsomethingelse{#2}{#2}{...}\space
\doifsomethingelse{#3}{#3}{...}%
\par}
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