On 4/26/24 18:18, Wolfgang Schuster wrote:
> Pablo Rodriguez via ntg-context schrieb am 26.04.2024 um 17:29:
>> What is wrong in my definition above?
>
> There is nothing wrong, this is just a side effect of the scanner used
> with the \do...groupempty commands. To have more control about this
> behavior use the \tolerant modifier for \def to change it.
Many thanks for your reply, Wolfgang.
I tried this approach (I hope it isn’t wrong):
\starttext
\expanded\tolerant\def\MyCommand#_#,#_#,#_#,#_{%
\doiftextelse{#4}%
{#4}
{\doiftextelse{#3}
{#3}
{#2}}}
\MyCommand{}{second}{third}{fourth},\\
\MyCommand{}{second}{third}{fourth} e,\\
\MyCommand{}{second}{third},\\
\MyCommand{}{second}{third} e,\\
\MyCommand{}{second},\\
\MyCommand{}{second} e,\\
\stoptext
BTW, this is the first time I see #_ instead of #1.
There is no way to search for "#_" in the wiki.
Grepping the source, "#_" seems to be used for optional arguments
(mainly in syst-aux.mkxl).
But what are these "#_" (which don’t seem to come from TeX)?
Many thanks for your help,
Pablo
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