"| 快捷方式在 babel 中不再可用？

Question

在回答这个问题，人们建议使用“babel速记”命令"|来打破单词中的连字shelfful。我这样做错了吗？还是这个命令在 中不再可用babel？（我在文档中找不到对此的提及。）

\documentclass{article}
\usepackage[american]{babel}
\begin{document}
shelf"|ful {shelf}ful shelf{}ful shelf\/ful
\end{document}

Answer 1

您必须添加德语速记，它知道几个"速记：

\documentclass{article}
\usepackage[ngerman,american]{babel}% american still active at \begin{document}
\useshorthands{"}
\addto\extrasamerican{\languageshorthands{ngerman}}

\begin{document}
shelfful shelf"|ful {shelf}ful shelf{}ful shelf\/ful
\end{document}

文件中的德语速记ngermanb.ldf：

\declare@shorthand{ngerman}{"`}{\glqq}
\declare@shorthand{ngerman}{"'}{\grqq}
\declare@shorthand{ngerman}{"<}{\flqq}
\declare@shorthand{ngerman}{">}{\frqq}
\declare@shorthand{ngerman}{"-}{\nobreak\-\bbl@allowhyphens}
\declare@shorthand{ngerman}{"|}{%
  \textormath{\penalty\@M\discretionary{-}{}{\kern.03em}%
              \allowhyphens}{}}
\declare@shorthand{ngerman}{""}{\hskip\z@skip}
\declare@shorthand{ngerman}{"~}{\textormath{\leavevmode\hbox{-}}{-}}
\declare@shorthand{ngerman}{"=}{\penalty\@M-\hskip\z@skip}