创建新的 cleveref 类型

Question

该包cleveref有两种类型的引用，\cref分别用于小写和\Cref大写。该包是否提供了定义更多类型的方法？如果没有，您如何自己定义一个？

举个例子，人们可能想要定义参考文献的缩写版本，比如代码：

\documentclass{article}

\usepackage{fontspec, amsthm, hyperref}
\usepackage[nameinlink]{cleveref}

\newtheorem{theorem}{Theorem}

% Defining \abbrcref
% Defining \abbrCref
% Defining \abbrcrefformat
% Defining \abbrCrefformat

\crefformat{theorem}{#2theorem #1#3}
\Crefformat{theorem}{#2Theorem #1#3}
\abbrcrefformat{theorem}{#2th.#1#3}
\abbrCrefformat{theorem}{#2Th.#1#3}

\begin{document}
    \begin{theorem}
        \label{sometheorem}
    \end{theorem}

    \cref{sometheorem}, \Cref{sometheorem}, \abbrcref{sometheorem}, \abbrCref{sometheorem}
\end{document}

会产生：

怎样才能做到这一点？

Answer 1

您可以定义一个变量引用名称，并为您可能想要缩写的交叉引用引入一个条件。

\documentclass{article}

\usepackage{fontspec, amsthm, hyperref}
\usepackage[nameinlink]{cleveref}

\newtheorem{theorem}{Theorem}

% Defining \abbrcref
% Defining \abbrCref
% Defining \abbrcrefformat
% Defining \abbrCrefformat

\newcommand{\theoremref}{\ifabbrcref th.\,\else theorem~\fi}
\newcommand{\Theoremref}{\ifabbrcref Th.\,\else Theorem~\fi}

\crefformat{theorem}{#2\theoremref#1#3}
\Crefformat{theorem}{#2\Theoremref#1#3}

\newif\ifabbrcref
\NewDocumentCommand{\genericabbrcref}{msom}{%
  \begingroup\abbrcreftrue
  \IfBooleanTF{#2}{%
    \IfNoValueTF{#3}{#1*{#4}}{#1*[#3]{#4}}%
  }{%
    \IfNoValueTF{#3}{#1{#4}}{#1[#3]{#4}}%
  }%
  \endgroup
}
\newcommand{\abbrcref}{\genericabbrcref\cref}
\newcommand{\abbrCref}{\genericabbrcref\Cref}

\begin{document}

\begin{theorem}\label{sometheorem}
\end{theorem}

\cref{sometheorem}, \Cref{sometheorem}, \abbrcref{sometheorem}, \abbrCref{sometheorem}

\end{document}

texdoc xparse有关 的更多信息，请参阅\NewDocumentCommand。