On Thu, Apr 21, 2011 at 1:32 PM, Wolfgang Schuster wrote:

Am 21.04.2011 um 12:28 schrieb Verhaag, G.C.H.M.:

Hi,

I try this example from the wiki page System Macros/Argument handling:

\def\dodefinesomething[#1][#2]%  {\getparameters[\??xx#1][#2]}

\def\definesomething%  {\dodoubleargumentwithset\dodefinesomething}

\starttext \definesomething[alfa][variable=test] \stoptext

Running this yields

! Undefined control sequence

I'm trying to write a few macros with optional delimited arguments with key-value sets and started reading the appropriate pages, but can't figure out why this example fails to run.

Anybody any idea?

I guess the message comes from your namespace which is in this form only allowed in unprotected mode, to enter you need \unprotect before and \protect after your command declarations

! Undefined control sequence. system > tex > error on line 8 in file test.tex: Undefined control sequence ... 1 \unprotect 2 \def\definesomething% 3 {\dodoubleargumentwithset\dodefinesomething} 4 \def\dodefinesomething[#1][#2]% 5 {\getparameters[\??xx#1][#2]} 6 \protect 7 \starttext 8 >> \definesomething[alfa][variable=test] 9 \stoptext 10 11 12 <argument> \??xx alfa \setsomevalue #1#2->\@EA \def \csname #1 #2\endcsname \p!doassign ...EAEA \setsomevalue \fi \fi {#1}{#2} {#3} \xprocesscommaitem ...@relax@ #1==\empty \@relax@ \@EAEAEA \xprocesscommaite... \xdogetparameters #1]->\xprocesscommaitem #1,] ,\@relax@ \next1 #1,->\@@dodowithsetcommand {#1} \doprocesscommaitem ... l.8 \definesomething[alfa][variable=test] -- luigi

On 04/21/2011 01:32 PM, Wolfgang Schuster wrote:

Am 21.04.2011 um 12:28 schrieb Verhaag, G.C.H.M.:

...

Hi,

I try this example from the wiki page System Macros/Argument handling:

\def\dodefinesomething[#1][#2]% {\getparameters[\??xx#1][#2]}

\def\definesomething% {\dodoubleargumentwithset\dodefinesomething}

\starttext \definesomething[alfa][variable=test] \stoptext

Running this yields

! Undefined control sequence

I'm trying to write a few macros with optional delimited arguments with key-value sets and started reading the appropriate pages, but can't figure out why this example fails to run.

Anybody any idea?

I guess the message comes from your namespace which is in this form only allowed in unprotected mode, to enter you need \unprotect before and \protect after your command declarations. Another problem is that you use a system namespace (two “?” and two letters) but for modules we use now four “?” and also more than two letter, e.g.

\def\????something{@@@@something}

\def\definesomething {\dodoubleargumentwithset\dodefinesomething}

\def\dodefinesomething[#1][#2]% {\getparameters[\????something#1][#2]}

You should also take a look at the \definenamespace command which creates the \define… and \setup… commands for you:

- http://wiki.contextgarden.net/Module_Namespaces - http://tex.stackexchange.com/questions/15157/how-to-make-a-ruler/15185#15185

Wolfgang

Hi, Thanks for the tips and the references to the appropriate wiki pages! Regards, Gerard Verhaag