Re: Macro with variable number of arguments

[Wolfgang Schuster <schuster.wolfgang@googlemail.com>]

Am 28.02.10 09:54, schrieb Otared Kavian:
> Hi all,
>
> I would like to write a macro which may have sometimes two, sometimes three arguments. The first and the last one are always present, but not necessarily the middle one. The unsatisfactory solution I have now is something like the example below:
>
> \define[2]\myMacroTwo{Name: #1\crlf Email: #2\crlf\thinrule\blank[small]}
> \define[3]\myMacroThree{Name: #1\crlf Address: #2 \crlf Email: #3\crlf\thinrule\blank[small]}
>
> \starttext
> \myMacroTwo{Hans}{hans@hagen.context.nl}
> \myMacroThree{Wolfgang}{Paradise of TeX, 2010}{wolfgang@schuster.context.de}
> \stoptext
>
> I think that (or rather I am certain…) in ConTeXt it is possible to define a unique macro called \myMacro which automatically tests the number of arguments: if there are  only two of them the commands in \myMacroTwo are executed, while if three arguments are present, the commands in \myMacroThree are executed.
>
> Can anyone give a hint on this matter?
>    
\def\myMacro
   {\dotriplegroupempty\domyMacro}

\def\domyMacro#1#2#3%
   {\doifelsenothing{#3}
      {Name: #1\crlf Email: #2\crlf}
      {Name: #1\crlf Address: #2 \crlf Email: #3\crlf}%
    \thinrule\blank[small]}

Wolfgang

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