![alignat 环境中的实际文本与 expl3 不正确](https://linux22.com/image/405554/alignat%20%E7%8E%AF%E5%A2%83%E4%B8%AD%E7%9A%84%E5%AE%9E%E9%99%85%E6%96%87%E6%9C%AC%E4%B8%8E%20expl3%20%E4%B8%8D%E6%AD%A3%E7%A1%AE.png)
我想重新定义alignat
环境以自动标记公式并将此公式作为标记 P 的实际文本插入。它工作正常,但为什么如果我打开expl3
语法,我会得到实际文本xs_StrFindGrou
。第二个问题是,如何删除所有额外的命令以将公式设置为段落的实际文本,而不使用xstring
包而只使用expl3
功能?谢谢大家的帮助。
\documentclass{article}
\usepackage{tagpdf,amsmath,xstring}
\tagpdfsetup{tabsorder=structure,uncompress,activate-all,interwordspace=true,tagunmarked=false}
\tagpdfifpdftexT
{
\pdfcompresslevel=0
%set language / can also be done with hyperref
\pdfcatalog{/Lang (en-US)}
\usepackage[T1]{fontenc}
\input glyphtounicode
\pdfgentounicode=1
}
\tagpdfifluatexT
{
%set language / can also be done with hyperref
\pdfextension catalog{/Lang (en-US)}
\usepackage{fontspec}
\newfontface\zerowidthfont{freeserif}
}
\pagestyle{empty}
\ExplSyntaxOn
\makeatletter
\long\def\doactualtext#1{
\def\@mltext{\detokenize\expandafter{#1}}
\def\@mltexttmp{}
\StrBehind[5]{\@mltext}{ }[\@mltexttmp]
\StrGobbleRight{\@mltexttmp}{1}[\@mltext]
\tagstructbegin{tag=P,actualtext-o=\detokenize\expandafter{\@mltext}}
\tagmcbegin{tag=P}
#1
\tagmcend
\tagstructend
}
\renewenvironment{alignat}{
\collect@body\doactualtext\space
\start@align
\z@\st@rredfalse
}{
\endalign
}
\makeatother
\ExplSyntaxOn
\begin{document}
\tagstructbegin{tag=Document}
\begin{alignat}
10xy^2+15x^2y-5xy7 & = 5\left(2xy^2+3x^2y-xy7\right) = \\
& = 5x\left(2y^2+3xy-y7\right) = \\
& = 5xy\left(2y+3x-7\right)
\end{alignat}
%\tagstructend Why i get an error,that there is no structure on the stack?
\end{document}
答案1
您会从 \tagstructend 收到错误,因为amsmath 命令会两次处理#1
您后面的部分。您可以使用来在测量步骤中抑制此错误。\doactualtext
\ifmeasuring@
由于您没有用波浪号替换空格,因此您获得了错误的替代文本。
\documentclass{article}
\usepackage{tagpdf,amsmath,xstring}
\tagpdfsetup{tabsorder=structure,uncompress,activate-all,interwordspace=true,tagunmarked=false}
\tagpdfifpdftexT
{
\pdfcompresslevel=0
%set language / can also be done with hyperref
\pdfcatalog{/Lang (en-US)}
\usepackage[T1]{fontenc}
\input glyphtounicode
\pdfgentounicode=1
}
\tagpdfifluatexT
{
%set language / can also be done with hyperref
\pdfextension catalog{/Lang (en-US)}
\usepackage{fontspec}
\newfontface\zerowidthfont{freeserif}
}
\pagestyle{empty}
\ExplSyntaxOn
\makeatletter
\long\def\doactualtext#1{
\def\@mltext{\detokenize\expandafter{#1}}
\def\@mltexttmp{}
\StrBehind[5]{\@mltext}{~}[\@mltexttmp]
\StrGobbleRight{\@mltexttmp}{1}[\@mltext]
\tagstructbegin{tag=P,actualtext-o=\detokenize\expandafter{\@mltext}}
\tagmcbegin{tag=P}
#1
\ifmeasuring@\else
\tagmcend
\tagstructend
\fi
}
\renewenvironment{alignat}{
\collect@body\doactualtext\space
\start@align
\z@\st@rredfalse
}{
\endalign
}
\makeatother
\ExplSyntaxOn
\begin{document}
\tagstructbegin{tag=Document}
\begin{alignat}
10xy^2+15x^2y-5xy7 & = 5\left(2xy^2+3x^2y-xy7\right) = \\
& = 5x\left(2y^2+3xy-y7\right) = \\
& = 5xy\left(2y+3x-7\right)
\end{alignat}
\tagstructend
\end{document}
我不知道你的替代者应该做什么。