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如何看待以下段落

tag-icon • tag-icon spacing paragraphs
如何看待以下段落

我是 TeX 新手，有点迷茫。有人能告诉我这个应该怎么写吗（代码中标记为“此处存在问题”）

情况：当参数 #2 是空格（空段落）时，我想使用下一段

\def\adjustParagraph#1\par{...some code here (which works ok)...}

\def\headline#1#2\par      % takes headline (#1) and the paragraph which follows (#2)
   {\myFont#1\par      % headline
   \if #2 {\adjustParagraph}   % if argument #2 is a space (empty paragraph) <= PROBLEM HERE
   \else{\adjustParagraph#2\par}   % argument #2 is text
   \fi}

\headline{This is headline}
Lorem ipsum dolor sit amet consectetuer ...

\headline{Another headline}

This time, argument 2 is that blank space above this line...

答案1

我不会使用分隔参数。此外，这\headline会与输出例程冲突，因此我改用\Headline您的宏。

\def\adjustParagraph#1\par{...some code here (which works ok)...}

\def\Headline#1#2\par      % takes headline (#1) and the paragraph which follows (#2)
  {\myFont#1\par      % headline
   \expandafter\ifx\space#2
     \expandafter\adjustParagraph
   \else
     \adjustParagraph#2\par   % argument #2 is text
   \fi
}

\Headline{This is headline}
Lorem ipsum dolor sit amet consectetuer ...

\Headline{Another headline}

This time, argument 2 is that blank space above this line...

\bye

需要注意两点：

  1. \expandafter\ifx\space#2将检测是否#2以空格标记开头（如果不是，其余部分将被忽略）。

  2. \expandafter\adjustParagraph必须在“真实”分支中使用才能摆脱\else。

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