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远处标签的条件页面引用

tag-icon • tag-icon hyperref cross-referencing labels cleveref varioref
远处标签的条件页面引用

目前，在我的论文中，我使用全局计数器对定理（和注释等）进行编号。如果参考文献距离标签太远，那么在印刷版中很难找到定理。有没有简单的方法可以修改我的参考命令以添加“在第 XXX 页”，以防参考文献和标签之间有 3 页的差距？你有什么建议或经验吗？

据我了解的文档，诸如 varioref 之类的软件包仅支持一页差异条件；但即使这样我也无法激活。

最小工作示例：

\documentclass{scrreprt}

\usepackage{blindtext} % lore ipsum...
\usepackage{amsthm}
\newtheorem{thm}{Theorem}

\begin{document}
  % example theorem:
  \begin{thm}\label{thm:foo}
    The future belongs to those who believe in their dreams.
  \end{thm}
  % generate more than 3 pages of text:
  \blindtext[20] 
  % reference:
  Reference to theorem \ref{thm:foo}. Here an automatic
  ``on page \pageref{thm:foo}'' would be nice.
\end{document}

Mico 的 MWE（参见下文讨论）：

\documentclass{scrreprt}
\usepackage{blindtext} % lore ipsum...
\usepackage{amsmath}
\usepackage{ntheorem}
\usepackage{varioref}
\usepackage{hyperref}
\newtheorem{thm}{Theorem}

\begin{document}
  % theorem foo
  \begin{thm}\label{thm:foo}
      The future belongs to those who believe in their dreams, see (\vref{eqn:bar})
  \end{thm}

  % some pages of text...
  \blindtext[15]

  % cross-reference to theorem within equation which is labeled itself (same works for figures)
  \begin{align}\label{eqn:bar}
    a+b=c\quad\text{(cf. Theorem \vref{thm:foo})}
  \end{align}
\end{document}

导致

  • ! Package amsmath Error: Multiple \label's: label 'eqn:bar' will be lost.
  • ! Package amsmath Error: Multiple \label's: label '4@xvr' will be lost.
  • 进一步的警告...

（部分）解决方案（基于基督徒的想法） 在尝试了 Christians 的建议后，我想到了一个解决方案（它似乎有效）。我必须在加载之前存储操纵的\ref命令。然后，我可以将其用作标准引用和可选的“页面”版本。出于某种奇怪的原因，这个\vrefhyperref\ref\vref仅与 babel 配合使用。为了避免错误的间距，添加“％”非常重要。

\documentclass{scrreprt}
\usepackage{blindtext} % lore ipsum...
\usepackage{amsmath}    
\usepackage[english]{babel} % < for some strange reason HAS to be loaded
%% --- ref manipulations as suggested by Christian Hupfer:
\makeatletter
\let\latex@@ref\ref

\newcounter{pagegaptreshhold}
\setcounter{pagegaptreshhold}{2}

\newcounter{tmpcntr}

\renewcommand{\ref}[1]{%
  \setcounter{tmpcntr}{\value{page}}%
  \addtocounter{tmpcntr}{-\getpagerefnumber{#1}}%
  \ifnum\value{tmpcntr} < 0 %
  \setcounter{tmpcntr}{\numexpr -1*\value{tmpcntr}}%
  \fi%
  \ifnum\value{tmpcntr} > \value{pagegaptreshhold}
  \latex@@ref{#1} on page \pageref{#1}%
  \else%
  \latex@@ref{#1}%
  \fi%
}
\makeatother
%% --- end cmhughes suggestion ---
\let\vref\ref
\usepackage{hyperref}

\newtheorem{thm}{Theorem}
\begin{document}
  % theorem foo
  \begin{thm}\label{thm:foo}
      The future belongs to those who believe in their dreams, see (\vref{eqn:bar})
  \end{thm}

  % some pages of text...
  \blindtext[30]

  % cross-reference to theorem within equation which is labeled itself (same works for figures)
  \begin{align}\label{eqn:bar}
    a+b=c\quad\text{(cf. Theorem \vref{thm:foo})}
  \end{align}
  In particular, we have now the choice between 
  \begin{itemize}
    \item ``on page''-if-too-far-away-style: Theorem \vref{thm:foo}
    \item classic style: Theorem \ref{thm:foo}
  \end{itemize}
\end{document}

答案1

\documentclass{article}

\usepackage{refcount}
\usepackage{blindtext}

\makeatletter
\let\latex@@ref\ref

\newcounter{pagegaptreshhold}
\setcounter{pagegaptreshhold}{2}

\newcounter{tmpcntr}

\renewcommand{\ref}[1]{%
  \setcounter{tmpcntr}{\value{page}}%
  \addtocounter{tmpcntr}{-\getpagerefnumber{#1}}%
  \ifnum\value{tmpcntr} < 0 %
  \setcounter{tmpcntr}{\numexpr -1*\value{tmpcntr}}%
  \fi%
  \ifnum\value{tmpcntr} > \value{pagegaptreshhold}
  \latex@@ref{#1} on page \pageref{#1}%
  \else%
  \latex@@ref{#1}%
  \fi%
}
\makeatother

\begin{document}

\section{first} 
In\ref{section::second} we will see that...
\blindtext[40]
\section{second} \label{section::second}
Here: \ref{section::second}

\end{document}

答案2

（在 OP 发布第二个更详细的 MWE 后更新答案。）

该varioref包在生成页面调用方面实现了以下决策规则：

  • 如果被交叉引用的项目与交叉引用位于同一页面，则不会产生与页面相关的词缀；

  • 如果交叉引用的项目和交叉引用位于相邻页面上，则在交叉引用上附加“在上一页”或“在下一页”。

  • 如果交叉引用的项目和交叉引用本身相隔两页或多页，则会生成“在第 x 页”的词缀。

如果您提前知道交叉引用和被交叉引用的项目之间会隔着几页，您也可以使用指令\fullref，它比更简单（使用更少的机器周期...）\vref。

如果您同时使用varioref和hyperref，则还应加载该cleveref包：这样做可修复前两个包之间的（轻微）冲突。如果您加载cleveref，则项目的名称（“方程”、“定理”等）将自动作为交叉引用调用的前缀。

\documentclass{scrreprt}
\usepackage{blindtext}    % lorem ipsum...
\usepackage{amsmath}
\usepackage[amsmath]{ntheorem}

\usepackage{varioref}     % for \vref and \fullref macros
\usepackage[colorlinks]{hyperref}
\usepackage[nameinlink]{cleveref}

\newtheorem{thm}{Theorem}

\begin{document}
\setcounter{chapter}{1} % just for this example

% theorem foo, with cross-reference to an equation
\begin{thm}\label{thm:foo}
The future belongs to those who believe in their dreams (see \vref{eqn:bar}). 
\end{thm}

% some pages of text...
\blindtext[15]

% equation bar, with cross-reference to a theorem 
\begin{align}\label{eqn:bar}
    a+b=c\quad\text{(cf.\ \fullref{thm:foo})}
\end{align}
\end{document}

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