algorithm2e 中仅在 \; 之后更改行号

Question

如何才能将一些段落的常规行为放在一起，而不在一个段落结束后改变算法中的行号？

我希望仅在出现后行号才会改变\;，并且段落会像往常一样缩进。

\If、、、\For的内容\While必须遵循相同规则：只在 之后编号一行\;。

因此，下一个 MWE 将有六行编号（假设块的开始和结束的行都已编号）：两行用于\While块的开始和结束，两行用于其内容，两行用于下一段。

\documentclass[oneside]{memoir}

\usepackage[linesnumbered]{algorithm2e}
\DontPrintSemicolon

\begin{document}
\begin{algorithm}[H]
\While{$i < n$}{
First line numbered...

First line continues in new paragraph...
first line ends.\;

Second line.\;
}

First line numbered...

First line continues in new paragraph...
first line ends.\;

Second line starts...

Second line continues in new paragraph...
second line ends.\;
\end{algorithm}
\end{document}

Answer 1

您可以将内容设置在自己的块内（例如固定宽度\parbox的锚定在[t]上文中):

\documentclass{article}

\usepackage[linesnumbered]{algorithm2e}
\DontPrintSemicolon

\begin{document}

\begin{algorithm}[H]
  First line numbered\ldots

  First line continues in new paragraph\ldots
  first line ends.\;

  Second line starts\ldots

  Second line continues in new paragraph\ldots
  second line ends.\;
\end{algorithm}

\begin{algorithm}[H]
  \parbox[t]{\dimexpr\algowidth-2\algomargin}{First line numbered\ldots

  First line continues in new paragraph\ldots
  first line ends.}\;
  \vspace{-\baselineskip}
  \parbox[t]{\dimexpr\algowidth-2\algomargin}{Second line starts\ldots

  Second line continues in new paragraph\ldots
  second line ends.}\;
  \vspace{-\baselineskip}
\end{algorithm}

\end{document}

---

处理此问题的另一种自动化方法是进行更改\nl，使其仅打印一次n编号l的行，然后自行停用。此外，让它\;暂时重新激活，然后再将其关闭。这些宏的重新定义是使用钩子插入铁件的一部分\nl来完成的。\beginalgorithm env

\documentclass{article}

\usepackage[linesnumbered]{algorithm2e}
\DontPrintSemicolon

\makeatletter
\AddToHook{env/algorithm/begin}{%
  % At the start of algorithm, make \nl only print something once
  \let\oldnl\nl
  \def\nl{\oldnl\let\nl\relax}
  \let\old@endalgoln\@endalgoln
  % Update \; (or \@endalgoln) to do the same thing
  \renewcommand{\@endalgoln}{%
    \def\nl{\oldnl\let\nl\relax}%
    \old@endalgoln
  }
}
\makeatother

\begin{document}

\begin{algorithm}[H]
  First line numbered\ldots

  First line continues in new paragraph\ldots
  first line ends.\;

  Second line starts\ldots

  Second line continues in new paragraph\ldots
  second line ends.\;
\end{algorithm}

\end{document}

_{我不确定这是否会破坏算法结构的其他组件。}