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确认 \keeppages 支持的输入类型吗？

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确认 \keeppages 支持的输入类型吗？

不支持似乎有点奇怪\keeppages{x-y}？也许我没有使用正确的语法。

此代码应进行调整，以满足文档前几页标记为 i、ii、iii、iv 等的情况。

\makeatletter
\newcommand{\discardpages}[1]{% \discardpages{<csv list>}
  \xdef\discard@pages{#1}% Store pages to discard
  \AtBeginShipout{% At shipout, decide whether to discard page/not
    \renewcommand*{\do}[1]{% How to handle each page entry in csv list
      \ifnum\value{page}=##1\relax%
        \AtBeginShipoutDiscard% Discard page/not
        \gdef\do####1{}% Do nothing further
      \fi%
    }%
    \expandafter\docsvlist\expandafter{\discard@pages}% Process list of pages to discard
  }%
}
\newif\ifkeeppage
\newcommand{\keeppages}[1]{% \keeppages{<csv list>}
  \xdef\keep@pages{#1}% Store pages to keep
  \AtBeginShipout{% At shipout, decide whether to discard page/not
    \keeppagefalse%
    \renewcommand*{\do}[1]{% How to handle each page entry in csv list
      \ifnum\value{page}=##1\relax%
        \keeppagetrue% Page should be kept
        \gdef\do####1{}% Do nothing further
      \fi%
    }%
    \expandafter\docsvlist\expandafter{\keep@pages}% Process list of pages to keep
    \ifkeeppage\else\AtBeginShipoutDiscard\fi% Discard page/not
  }%
}
\makeatother

答案1

问“为什么”是毫无意义的。命令已经写好了。

如果您想按页面范围选择，您可以使用该pagesel包。

仅在文档完全编译并解析所有交叉引用后才激活页面选择选项。页面范围使用绝对页码。

\documentclass{book}

\usepackage[4-7,9] %activate options after a full compilation cycle
 {pagesel}

\begin{document}
\frontmatter
TITLE
\mainmatter
\ExplSyntaxOn
\int_step_inline:nn {15}{\newpage A~PAGE}
\ExplSyntaxOff
\end{document}

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