doifsomething vs iffirstargument in TABLE?

doifsomething vs iffirstargument in TABLE?

[Jon Wong]

Hi all,

If I use iffirstargument, the optional (first argument) is always seen as false.

If I use doifsomething, it works, but the “else” part is never executed when it should.

MWE:

\starttext

% \def\MyRow{\dosingleempty\doMyRow}
% \def\doMyRow[#1]#2#3#4#5{%
%   \bTR \bTD #2 \eTD %
%   \iffirstargument
%     \bTD Replaced! \eTD %
%   \else
%     \bTD #3 \eTD %
%   \fi
%   \bTD #4 \eTD \bTD #5 \eTD \eTR
% }

\def\MyRow{\dosingleempty\doMyRow}
\def\doMyRow[#1]#2#3#4#5{%
  \bTR \bTD #2 \eTD %
  \doifsomething{#1}
    {\bTD Replaced! \eTD }%
    {\bTD #3 \eTD }%
  \bTD #4 \eTD \bTD #5 \eTD \eTR
}

\bTABLE
\bTABLEbody
\MyRow{A}{B}{C}{D}
\MyRow[optional]{A}{B}{C}{D}
\eTABLEbody
\eTABLE

\stoptext


Regards
Jon

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Re: doifsomething vs iffirstargument in TABLE?

[Wolfgang Schuster]

Jon Wong schrieb am 12.09.2019 um 15:44:
> Hi all,
>
> If I use iffirstargument, the optional (first argument) is always seen as false.
>
> If I use doifsomething, it works, but the “else” part is never executed when it should.
>
> MWE:
>
> \starttext
>
> % \def\MyRow{\dosingleempty\doMyRow}
> % \def\doMyRow[#1]#2#3#4#5{%
> %   \bTR \bTD #2 \eTD %
The \bTD command for the cell content has an optional argument
which changes the value of the firstargument conditional and your
check below uses the result from \bTD.
> %   \iffirstargument
> %     \bTD Replaced! \eTD %
> %   \else
> %     \bTD #3 \eTD %
> %   \fi
> %   \bTD #4 \eTD \bTD #5 \eTD \eTR
> % }
>
> \def\MyRow{\dosingleempty\doMyRow}
> \def\doMyRow[#1]#2#3#4#5{%
>    \bTR \bTD #2 \eTD %
>    \doifsomething{#1}
\doifsomethingelse{#1}
>      {\bTD Replaced! \eTD }%
>      {\bTD #3 \eTD }%
>    \bTD #4 \eTD \bTD #5 \eTD \eTR
> }
>
> \bTABLE
> \bTABLEbody
> \MyRow{A}{B}{C}{D}
> \MyRow[optional]{A}{B}{C}{D}
> \eTABLEbody
> \eTABLE
>
> \stoptext
Wolfgang

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