Re: Macro with variable number of arguments

[Otared Kavian <otared@gmail.com>]

On 28 févr. 2010, at 10:17, Wolfgang Schuster wrote:

> \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

Many thanks Wolfgang! Your solution solves my question.

Now for a complete understanding of the solution (and before putting your solution on the wiki), here is another question.
After reading your solution, I searched in the source files and saw that in the file
syst-gen.mkii
the command \dosinglegroupempty, until \doquintuplegroupempty are defined.
For instance
\def\dotriplegroupempty#1%
  {\def\dodogetargument##1%
     {\def\dodogetargument####1%
        {\def\dodogetargument%
           {\dontpermitspacesbetweengroups
            #1{##1}{####1}}%
         \dogetgroupargument\thirdargumenttrue\thirdargumentfalse}%
      \dogetgroupargument\secondargumenttrue\secondargumentfalse}%
   \dogetgroupargument\firstargumenttrue\firstargumentfalse}

Can one use other constructions like these, for example can one define
\dosepttuplegroupempty 
in order to have macros with 7 arguments, of which 5 are always present, while the sixth and seventh may be absent in some occasions?

Thanks again: OK
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