Cfrgtkky

I am attempting to automate the use rectangle split parts with a foreach loop. In the following MWE, the manual use of nodepart works as expected. The foreach loop fails with

./makebox-mwe.tex:71: Extra }, or forgotten endgroup.

pgfutil@reserved@c ->egroup 

                              relax 

l.71 end{outerenv}

The code:

documentclass{article}



usepackage{tikz}

usepackage{xparse}

usepackage{etoolbox}

usetikzlibrary{shapes.multipart}



%% Thanks to egreg, make lrbox* global (requires etoolbox.sty):

cslet{glrbox}lrbox

expandafterpatchcmdcsname glrboxendcsname{setbox}{globalsetbox}{}{}

cslet{endglrbox}endlrbox



newsavebox{myboxi}    

newsavebox{myboxii}   

newsavebox{myboxiii}

newsavebox{myboxiv}   

newsavebox{myboxv}



newcounter{myboxes}



defnumname#1{%

  ifcase#1or oneor twoor threeor fouror fiveor sixor sevenor eightor nineor tenor eleven or twelveor thirteenor fourteenor fifteenor sixteenor seventeenor eighteenor nineteenor twentyfi%

}



NewDocumentEnvironment{outerenv}{}{%

    setcounter{myboxes}{0}%

}{%

    tikz node[draw,rectangle split,rectangle split parts=5,rectangle split ignore empty parts]

    {%

        %% This does NOT work:

        foreach nn in {1,...,themyboxes}{%

        edeftmpname{csname myboxromannumeralnnendcsname}typeout{tmpname}%

        deftmpnum{numname{nn}}typeout{tmpnum}%

        nodepart{tmpnum}usebox{tmpname}%

        }%

        %%%

        %% This works:

%       nodepart{one}{usebox{myboxi}}

%       nodepart{two}{usebox{myboxii}}

%       nodepart{three}{usebox{myboxiii}}

%       nodepart{four}{usebox{myboxiv}}

%       nodepart{five}{usebox{myboxv}}%

    };%

}



NewDocumentEnvironment{innerenv}{}{%

    stepcounter{myboxes}%

    edeftmpname{csname myboxromannumeralthemyboxesendcsname}%typeout{tmpname}%

    begin{glrbox}{tmpname}

        begin{minipage}[t]{2in}

}{%

        end{minipage}%

    end{glrbox}%

}



begin{document}



begin{outerenv}



begin{innerenv}

First

end{innerenv}



begin{innerenv}

Second

end{innerenv}



begin{innerenv}

Third

end{innerenv}



end{outerenv}



end{document}

NOTE: I know that there are probably a million (gajillion?) other ways of doing this. But my curiosity is piqued as to why this apparently straightforward attempt fails.

It appears one can not use nodepart{..} inside a group (e.g. {nodepart{...}} or inside a LaTeX environment).

Alternative is to use some looping not using groups. For example the pgfplotsforeachungrouped or pgfplotsinvokeforeach of pgfplots.

As a poor man alternative you have lightweight package xinttools which provides xintFor* loop:

documentclass{article}



usepackage{tikz}

usepackage{xparse}

usepackage{etoolbox}

usetikzlibrary{shapes.multipart}



%% Thanks to egreg, make lrbox* global (requires etoolbox.sty):

cslet{glrbox}lrbox

expandafterpatchcmdcsname glrboxendcsname{setbox}{globalsetbox}{}{}

cslet{endglrbox}endlrbox



newsavebox{myboxi}    

newsavebox{myboxii}   

newsavebox{myboxiii}

newsavebox{myboxiv}   

newsavebox{myboxv}



newcounter{myboxes}



defnumname#1{%

  ifcase#1 or oneor twoor threeor fouror fiveor sixor sevenor eightor nineor tenor eleven or twelveor thirteenor fourteenor fifteenor sixteenor seventeenor eighteenor nineteenor twentyfi%

}



usepackage{xinttools}% for xintFor/xintFor* loops



NewDocumentEnvironment{outerenv}{}{%

    setcounter{myboxes}{0}%

}{%

    tikz node[draw,rectangle split,rectangle split parts=5,rectangle split ignore empty parts]

    {%

%        foreachnn in {1, ..., themyboxes}

% xinttools manual says to use "do" but we can use any token, such as ":"

        xintFor* ##1 in {xintSeq{1}{value{myboxes}}}:

        {%

%        edeftmpname{csname myboxromannumeral##1endcsname}%

%        deftmpnum{numname{##1}}%

%        nodepart{tmpnum}usebox{tmpname}%

%        nodepart{numname{nn}}usebox{csname myboxromannumeralnnendcsname}%

        %begingroup% just testing to confirm with it same error as in OP

        nodepart{numname{##1}}%

        %endgroup % bien sûr nodepart n'aime pas cela...

        usebox{csname myboxromannumeral##1endcsname}%

        }%

        %%%

        %% This works:

      % nodepart{one}{usebox{myboxi}}

      % nodepart{two}{usebox{myboxii}}

      % nodepart{three}{usebox{myboxiii}}

      % nodepart{four}{usebox{myboxiv}}

      % nodepart{five}{usebox{myboxv}}%

    };%

}



NewDocumentEnvironment{innerenv}{}{%

    stepcounter{myboxes}%

    edeftmpname{csname myboxromannumeralthemyboxesendcsname}%

    begin{glrbox}{tmpname}

        begin{minipage}[t]{2in}

}{%

        end{minipage}%

    end{glrbox}%

}



begin{document}



begin{outerenv}



begin{innerenv}

First

end{innerenv}



begin{innerenv}

Second

end{innerenv}



begin{innerenv}

Third

end{innerenv}



end{outerenv}



end{document}