使用 \newcommand 与 expex 时出现神秘的垂直空格

Question

好的，这里有一些代码可以展示我遇到的问题：

\documentclass[10pt,letterpaper]{article}
\usepackage{expex}

\newcommand{\gloss}[3]{\ex[numoffset=2em,aboveglftskip=0pt]
\begingl
\gla #1//
\glb #2//
\glft #3//
\endgl
\xe}

\begin{document}
\gloss123

blahblahblahblahblahblahblahblahblahblahblahblahblah

\ex[numoffset=2em,aboveglftskip=0pt]
\begingl
\gla 1//
\glb 2//
\glft 3//
\endgl
\xe

blahblahblahblahblahblahblahblahblahblahblahblahblah

\end{document}

这是它的输出：

如您所见，第一个注释和 blah 之间有额外的垂直空间。如何在仍使用 \newcommand 的情况下消除此问题？

Answer 1

这是因为\gloss{.}{.}{.}在输入流中留下了虚假的空间。您可以通过%在末尾放置一个或在\ignorespaces定义末尾添加来避免这种情况\newcommand：

\documentclass{article}
\usepackage{expex}

\newcommand{\gloss}[3]{\ex[numoffset=2em,aboveglftskip=0pt]
\begingl
\gla #1//
\glb #2//
\glft #3//
\endgl
\xe
\ignorespaces}

\begin{document}
\gloss{1}{2}{3}%

blahblahblahblahblahblahblahblahblahblahblahblahblah

\ex[numoffset=2em,aboveglftskip=0pt]
\begingl
\gla 1//
\glb 2//
\glft 3//
\endgl
\xe

blahblahblahblahblahblahblahblahblahblahblahblahblah

\end{document}

Answer 2

\vspace{-\baselineskip}}我不知道为什么会发生这种情况，但我们可以在命令末尾添加负垂直空间来解决这个问题。

\documentclass[10pt,letterpaper]{article}
\usepackage{expex}

\newcommand{\gloss}[3]{\ex[numoffset=2em,aboveglftskip=0pt]
\begingl
\gla #1//
\glb #2//
\glft #3//
\endgl
\xe
\vspace{-\baselineskip}
}
\begin{document}
\gloss123

blahblahblahblahblahblahblahblahblahblahblahblahblah

\ex[numoffset=2em,aboveglftskip=0pt]
\begingl
\gla 1//
\glb 2//
\glft 3//
\endgl
\xe

blahblahblahblahblahblahblahblahblahblahblahblahblah

\end{document}