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根据行索引插入分页符/换行符

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根据行索引插入分页符/换行符

我很难找到解决方案来理解row宏最后一行中的以下代码有什么问题，特别是代码\xifinlist{\arabic{currow}}{\rowpagebreaks}{\pagebreak}{}。我想要实现的是，如果行索引（存储在中currow）位于需要从新页面（存储在中rowpagebreaks）开始的行索引列表中，则会导致插入，\pagebreak以便 longtable 知道从空白页上的这一特定行开始。虽然硬编码\pagebreak按预期工作，但使用条件插入为\pagebreak我提供了以下错误消息，我无法以有意义的方式解释这些错误消息：

Misplaced \noalign.
\pagebreak ->\noalign 
                      {\ifnum `}=0\fi \@testopt {\LT@no@pgbk -}4
l.85     \row{\datespan{11/2008}{03/2013}}{b}
                                             %
I expect to see \noalign only after the \cr of
an alignment. Proceed, and I'll ignore this case.
 main.tex, line 88
Misplaced \omit.
\multispan ->\omit 
                   \@multispan 
l.88     \rowsection{Section B}
                               %
I expect to see \omit only after tab marks or the \cr of
an alignment. Proceed, and I'll ignore this case.

我的问题是，为什么插入/硬编码\pagebreak工作正常，但使用条件会触发这种错误？ 有没有办法解决这种错误和情况？

\documentclass{article}
\usepackage[utf8]{inputenc}
\usepackage{longtable}
\usepackage{etoolbox}

\setlength{\tabcolsep}{0pt}

% counting the rows
\newcounter{currow}

\newlength{\rowmargin}
\setlength{\rowmargin}{15pt}

\newtoggle{addrowmargin}
\togglefalse{addrowmargin}

\newtoggle{debug}
\togglefalse{debug}

% a list of row indexes when a pagebreak should be inserted
\newcommand*\rowpagebreaks{}
\forcsvlist{\listadd\rowpagebreaks}{3,6}

\newcommand{\row}[2]{%
    \iftoggle{debug}{%
        {\scriptsize\textbf{Row: \arabic{currow}}\newline}%
    }{}%
    %
    {#1} & {#2}%
    %
    \stepcounter{currow}%
    %
    \tabularnewline%
    % If the index of the current row is found in the list of rows that require to start at a new blank page, insert a \pagebreak or \newpage ...
    %
    % Manually inserting \pagebreak or \newpage works
    %\pagebreak
    %\newpage   
    % However, this does not work ...
    \xifinlist{\arabic{currow}}{\rowpagebreaks}{\pagebreak}{}%
}

\newcommand{\rowsection}[1]{%
    \rowspan{%
        \begin{minipage}[t]{\columnwidth}%
            \vspace{20pt}% top section margin
            {\normalfont\sffamily\footnotesize #1 \par}%
            \vspace{-\baselineskip}%
            \vspace{6pt}% margin between text and line
            \rule{\linewidth}{.5pt}%
            \vspace{12pt}% bottom section margin
        \end{minipage}%
    }%
    % reset row counter to zero
    \stepcounter{currow}%
    \togglefalse{addrowmargin}%
    %
    \tabularnewline%
    \hline%
}

\newcommand{\rowspan}[1]{%
    % no indent of column
    \multicolumn{2}{@{}l@{}}{%
        \iftoggle{debug}{%
            {\scriptsize\textbf{Row: \arabic{currow}}~ }%
        }{}%
        #1%
    }%
}

\newcommand{\colwidth}[1]{%
    \dimexpr #1\textwidth-2\tabcolsep%
}%

\newcommand{\datespan}[2]{%
    \begin{minipage}[t]{\colwidth{.23}}#1\hfill-\hfill#2\end{minipage}%
}%

\begin{document}

\begin{longtable}{@{}p{\colwidth{.25}}p{\colwidth{.75}}@{}}%
    \rowsection{Section A}%
    \row{\datespan{11/2008}{03/2013}}{b}%
    \row{\datespan{11/2008}{03/2013}}{b}%
    \row{a}{b}%
    \row{a}{b}%
    \rowsection{Section B}%
    \row{\datespan{11/2008}{03/2013}}{b}%
    \row{\datespan{11/2008}{03/2013}}{b}%
    \row{a}{b}%
    \row{a}{b}%
\end{longtable}%

\end{document}

答案1

我认为 \xifinlist 不可扩展。您也许可以使用 expl3 进行测试，但通常将测试移到之前的单元格中会更容易：

\newcommand\conditionalpagebreak{}
\newcommand{\row}[2]{%
    \iftoggle{debug}{%
        {\scriptsize\textbf{Row: \arabic{currow}}\newline}%
    }{}%
    %
    {#1} & {#2}%
    %
    \stepcounter{currow}%
    %
    \xifinlist{\arabic{currow}}{\rowpagebreaks} 
        {\global\let\conditionalpagebreak\pagebreak}
        {\gdef\conditionalpagebreak{}}%
    \tabularnewline
    \conditionalpagebreak
}

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