* conditional argument and \doifemptyelse
@ 2013-11-06 19:26 Pablo Rodriguez
2013-11-06 21:33 ` Wolfgang Schuster
0 siblings, 1 reply; 3+ messages in thread
From: Pablo Rodriguez @ 2013-11-06 19:26 UTC (permalink / raw)
To: mailing list for ConTeXt users
Dear list,
I’m trying to define a command that has a conditional argument:
\def\MyCommand#1#2#3{#1, #2, \doifemptyelse{#3}{#1}{#3}}
\starttext
\MyCommand{first}{second}
\stoptext
The problem is that \doifemtpyelse only works if there the third
argument is there as {}. And the third argument is actually an exception
to workaround an unwanted behavior of the command in very few
exceptional cases.
Is there no way to make \MyCommand above work with \doifemptyelse even
if its third argument is not defined?
Many thanks for your help,
Pablo
--
http://www.ousia.tk
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^ permalink raw reply [flat|nested] 3+ messages in thread* Re: conditional argument and \doifemptyelse
2013-11-06 19:26 conditional argument and \doifemptyelse Pablo Rodriguez
@ 2013-11-06 21:33 ` Wolfgang Schuster
2013-11-07 19:07 ` Pablo Rodriguez
0 siblings, 1 reply; 3+ messages in thread
From: Wolfgang Schuster @ 2013-11-06 21:33 UTC (permalink / raw)
To: mailing list for ConTeXt users
Am 06.11.2013 um 20:26 schrieb Pablo Rodriguez <oinos@gmx.es>:
> Dear list,
>
> I’m trying to define a command that has a conditional argument:
>
> \def\MyCommand#1#2#3{#1, #2, \doifemptyelse{#3}{#1}{#3}}
> \starttext
> \MyCommand{first}{second}
> \stoptext
>
> The problem is that \doifemtpyelse only works if there the third
> argument is there as {}. And the third argument is actually an exception
> to workaround an unwanted behavior of the command in very few
> exceptional cases.
>
> Is there no way to make \MyCommand above work with \doifemptyelse even
> if its third argument is not defined?
\def\MyCommand
{\dotriplegroupempty\doMyCommand}
\def\doMyCommand#1#2#3%
{#1, #2, \ifthirdargument #3\else #1\fi}
\starttext
\MyCommand{first}{second}{third}
\MyCommand{first}{second}
\stoptext
Wolfgang
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___________________________________________________________________________________
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