Re: How to \processcommalist inside another commalist?

[nico <nicolas.marsgui@libertysurf.fr>]

On Mon, 21 Aug 2006 20:35:27 +0200, Mojca Miklavec  
<mojca.miklavec.lists@gmail.com> wrote:

>> %% Why using parameter for this?
>
> I was sure that someone would ask that. I want to provide optional
> parameters for both numbers and scaling:
>     \useGNUPLOTgraphic[name]
> or
>     \useGNUPLOTgraphic[name][width=.9\textwidth]
> or
>     \useGNUPLOTgraphic[name][n={1,3}]
> or
>     \useGNUPLOTgraphic[name][n={1,3},width=.9\textwidth]
>
> but after some thinking I realized that it would indeed be a better
> idea (less to type?) to have
>     \useGNUPLOTgraphic[name][1,3]
> and
>     \useGNUPLOTgraphic[name][1,3][width=.9\textwidth]
> instead.
>
> At the beginning the main reason against it was that I didn't know how
> to distinguish which kind of parameters are being used in the second
> pair of brackets, but I guess that I can safely use \ifnumberelse as a
> test on the first item to distinguish between the two.

Maybe you could play only with the parameter count. The limitation is that  
an empty second argument is required when only options need to be passed.

\def\printPrime#1{#1 is prime.\crlf}

\def\useGNUPLOTgraphic
   {\dotripleempty\douseGNUPLOTgraphic}

\def\douseGNUPLOTgraphic[#1][#2][#3]%
   {\ifthirdargument
      \doprime{#2}
      parameters are #3
      \getparameters[gnuplot][#3]
    \else\ifsecondargument
      \doprime{#2}
    \fi\fi}

\def\doprime#1{\processcommalist[#1]\printPrime}

\starttext
\useGNUPLOTgraphic[name]
\useGNUPLOTgraphic[name][2,3,5]
\useGNUPLOTgraphic[name][3,5,7][width=2in]
\useGNUPLOTgraphic[name][][width=4in]
\stoptext

Regards,
BG