Re: input Datei in tabular

Hallo,

[Das Folgende in Englisch; zu spät gemerkt, dass Deutsch hier passender 
gewesen wäre.]

On 2023-02-21 20:24, fi (via tex-d-l Mailing List) wrote:
> 
> oft habe ich tabellierte Daten, die aus unterschiedlichen Quellen
> stammen und in einfachen Dateien liegen. Ein vereinfachtes Beispiel
> zeigt die Datei "dat.tex":
> 
>     1 &  2 & 3 \\
>    42 & 13 & 5 \\
> 
> Diese Datei soll von einem TeX-File per \input eingelesen werden.
> 
> \documentclass{article}
> \begin{document}
> \begin{tabular}{|r|r|r|}
>    A & B & C \\
>    \hline
>    \input{dat}
>    \hline
> \end{tabular}
> \end{document}

LaTeX's redefinition of \input is not expandable. Thus, there is some 
left-over stuff of \input after the latest \\ in dat.tex, starting
a new row. Then, \hline complains, because it wants to be at the start 
of a row.

Sometimes, it helps to let \input end in a cell, where some additional
non-expandable stuff does not matter:
Remove the latest \\ in dat.tex and insert it after \input:
   \input{dat}\\

But this trick will not always work, e.g. S columns of siunitx will
break, because they need a special parsing of the cell.
Package catchfile can help to read the file contents in a macro:

\usepackage{catchfile}

\CatchFileDef{\TableBody}{dat}{}

[...]
\hline
\TableBody
\hline
[...]

If the table body contains category code trickery (\verb, ...),
then it becomes more complicate:
In the last argument of \CatchFileDef, the category codes should be 
setup to verbatim mode. The macro is then read in eTeX's \scantokens:

\CatchFileDef{\TableBody}{dat}{\csname @sanitize\endcsname}% as a start

[...]
\hline
\scantokens\expandafter{\TableBody}
\hline
[...]

Yours sincerely
   Heiko

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