Am 06.06.2013 um 09:56 schrieb Jaroslav Hajtmar :
> Hello ConTeXist.
> Is there in ConTeXt any dirty trick, which can put more than 9 parameters
> into macro?
>
> I mean for example \define[25]\macrowithtwentyfiveparams{ }
There are a few tricks when you need more then nine parameters
but it’s better to use a different method to pass argument from
one command to another. Better and more readable solutions are
intermediate commands for each value or assignment lists (a=x,b=y,…).
> I use rarely any trick from Peter Olsak (see below) and I'd like something
> like that used in ConTeXt.
>
> Thanx
> Jaroslav Hajtmar
>
> Here is minimal example of trick of Petr Olsak:
>
> \newcount\tempnum
> \def\terminator{*}
> \newcount\tempnum
> \def\readparameters{\tempnum=0\let\next=\readone \next}
> \def\readone #1,{\advance\tempnum by 1 \def\param{#1}%
>%\the\tempnum - \param\par%
>\ifx\param\terminator \let\next=\relax
>\else\expandafter\gdef\csname param\the\tempnum\endcsname{#1}%
>\fi\next}
>
>
> \def\moreparameters#1{%
> \readparameters #1 %
> \csname param1\endcsname, % write first parameter
> \csname param3\endcsname, % write third parameter
> \csname param5\endcsname, % write fifth parameter
> }
>
>
> \starttext
>
> %\readparameters a,b,c,d,e,f,g,h,i,j,k,m,n,o,*, %
> %\def\parameters{aaa,,,,e,f,g,*,}
> %\expandafter\readparameters\parameters
>
> \moreparameters{a,b,c,d,e,f,g,h,i,j,k,m,n,o,*,}
>
> \stoptext
Can be simplified with \processcommalist:
\starttext
\def\domoreparameters#1%
{\advance\scratchcounter\plusone
\setvalue{param\number\scratchcounter}{#1}}
\def\moreparameters[#1]%
{\scratchcounter\zerocount
\processcommalist[#1]\domoreparameters}
\moreparameters[a,b,c,d,e,f,g,h,i,j,k,m,n,o]
\getvalue{param1},
\getvalue{param2},
\getvalue{param3}
\stoptext
Wolfgang
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