从传递给宏的参数中删除换行符

Question

我想要一个命令来接收一些文本并以某种样式打印出来等。我还想确保打印的行不会有强制换行符，即如果有人这样做

\mymacro{first paragraph \\ second paragraph}

我想打印first paragraph second paragraph并使其遵循基于线宽的正常换行

Answer 1

在宏定义设置的某个本地组中

\def\\{\relax\ifhmode\unskip\fi\space\ignorespaces}

这样a\\b a \\ b每个行为a b都会\\删除其自身之前的任何空格，添加一个空格，然后忽略任何后续空格。

大卫

Answer 2

递归来过滤掉\\。

\documentclass[10pt]{article}
\newcommand\mymacro[1]{\mymacroaux#1\\\relax}
\long\def\mymacroaux#1\\#2\relax{%
  #1\ifx\relax#2\else\unskip\ \mymacroaux\ignorespaces#2\relax\fi}
\begin{document}
\mymacro{first paragraph \\ second paragraph}X

\mymacro{first paragraph \\ second paragraph} X

\mymacro{first paragraph \\ second paragraph\\3rd paragraph }X

\mymacro{first paragraph 

second paragraph\\3rd paragraph 

Fourth para} X
\end{document}

如果你想要一个不会耗尽堆栈的版本，那么

\documentclass[10pt]{article}
\newcommand\mymacro[1]{\mymacroaux#1\\\relax}
\long\def\mymacroaux#1\\#2\relax{%
  #1%
  \ifx\relax#2\relax\def\next{}%
  \else\unskip\ \def\next{\mymacroaux\ignorespaces#2\relax}%
  \fi%
  \next%
}
\begin{document}
\mymacro{first paragraph \\ second paragraph}X

\mymacro{first paragraph \\ second paragraph} X

\mymacro{first paragraph \\ second paragraph\\3rd paragraph }X

\mymacro{first paragraph 

second paragraph\\3rd paragraph 

Fourth para} X
\end{document}

Answer 3

我还发现了这个解决方法，它重新定义\\为生成一个空字符串

\newcommand\mymacro[1]{ {\let \\ \empty #1} }