我对@Skillmon 提供的一段代码非常满意，请参见此处
对于处理文档，逐节创建彼此接近的不同语言很有用。然而，最终文档需要所有章节都使用第一种语言，然后所有章节都使用第二种语言，依此类推。当然，章节计数器也需要重置。
我尝试用一个简单的 for 循环来实现这一点，但没有成功
\documentclass{scrartcl}
\usepackage{multilanguage}
\usepackage{multiaudience}
\usepackage{pgffor}
\SetNewAudience{intern}
\SetNewAudience{extern}
\DefCurrentAudience{intern,extern}
\SetNewLanguages{DE,EN}
\begin{document}
\foreach \langlooper in {DE,EN}{
\newpage
\DefCurrentLanguage{\langlooper}
\setcounter{section}{0}
\section{Erstens}
\lang{DE}{THIS IS GERMAN\\
\showto{intern} {DE: INTERN TEXT}\\
\showto{extern}{DE: EXTERN TEXT}\\
}
\lang{EN}{THIS IS ENGLISH\\
\showto{intern} {EN: INTERN TEXT}\\
\showto{extern}{EN: EXTERN TEXT}\\
}
\lang{DE}{\section{GERMAN SECTION}}
\lang{EN}{\section{ENGLISH SECTION}}
new try
\mlsection{DE=German Section, EN=English Section, default=FALLBACK TITLE, label=sec:multilang}
\begin{langen}{DE}
THIS PARAGRAPH IS GERMAN.
THIS, TOO
\end{langen}
\begin{langen}{EN}
THIS PARAGRAPH IS ENGLISH.
THIS, TOO
\end{langen}
\mlsubsection{DE=German Subsection, EN=English Subsection,}
See section~\ref{sec:multilang}.
See in figure \ref{fig:fig2}
\begin{figure}
\centering{
An EXAMPLE
}
\caption{\lang{EN}{A caption} \lang{DE}{Eine Bildunterschrift}}
\label{fig:label1}
\end{figure}
\begin{figure}
\centering{
An EXAMPLE
}
\mlcaption{DE=Eine Bildunterschrift, EN=A caption, label=fig:fig2}
\end{figure}
}
\end{document}
似乎 \langlooper 键没有被正确用作参数有什么提示吗？
谢谢乔治
PS:这是multilanguage.sty的代码
%% LaTeX2e file `multilanguage.sty'
%% generated by the `filecontents' environment
%% from source `test3' on 2023/09/11.
%%
\NeedsTeXFormat{LaTeX2e}
\ProvidesPackage{multilanguage}
[2023/09/08 v1.0 Some tests]
\RequirePackage{expkv}
\providecommand*\CurrentLanguage{}
\protected\def\DefCurrentLanguage
{%
\@MULTLANG@deactivate
\ekvcsvloop\@MULTLANG@activate
}
\protected\def\@MULTLANG@activate#1%
{%
\expandafter\let
\csname @MULTLANG@@iflang@\detokenize{#1}\endcsname
\@firstoftwo
}
\newcommand\@MULTLANG@deactivate{}
\protected\def\SetNewLanguages{\ekvcsvloop\@MULTLANG@new@language}
\protected\def\@MULTLANG@new@language#1%
{%
\@ifundefined{@MULTLANG@@iflang@\detokenize{#1}}%
{%
% add it to the list of languages which need to be deactivated on
% language change
\edef\@MULTLANG@deactivate
{%
\unexpanded\expandafter{\@MULTLANG@deactivate}%
\unexpanded\expandafter
{%
\expandafter\let
\csname @MULTLANG@@iflang@\detokenize{#1}\endcsname
\@secondoftwo
}%
}%
% init the language
\expandafter\let
\csname @MULTLANG@@iflang@\detokenize{#1}\endcsname
\@secondoftwo
}%
{%
\PackageError{multilanguage}%
{Language `\detokenize{#1}' already defined.}{}%
}%
}
\def\lang#1%
{%
\@ifundefined{@MULTLANG@@iflang@\detokenize{#1}}%
{%
% expandable error message
\ekverr{multilanguage}{Unknown language `#1'}%
\@gobble
}%
{%
\csname @MULTLANG@@iflang@\detokenize{#1}\endcsname
\@firstofone
\@gobble
}%
}
\RequirePackage{environ}
\NewEnviron{langen}[1]{%
\lang{#1}{\BODY}}
\ekvsetdef\@MULTLANG@section@keys{MULTLANG/section}
% keep in mind that the key will be used in an expanded-context, so we use
% \unexpanded
\ekvdef{MULTLANG/section}{label}{\unexpanded{\label{#1}}}
% default will only be used if no other language was used before it
\ekvdef{MULTLANG/section}{default}
{%
\ifcsname @MULTLANG@@flag@notfirst\endcsname
\expandafter\@gobble
\else
\expandafter\@gobble\csname @MULTLANG@@flag@notfirst\endcsname
\expandafter\@firstofone
\fi
{\unexpanded{#1}}%
}
% every unknown key will be interpreted as a language key
\ekvdefunknown{MULTLANG/section}
{%
\lang{#2}
{%
\ifcsname @MULTLANG@@flag@notfirst\endcsname
\space/\space
\else
\expandafter\@gobble\csname @MULTLANG@@flag@notfirst\endcsname
\fi
\unexpanded{#1}%
}%
}
\def\mlsection#1%
{%
% group to keep the notfirst-flag local
\begingroup
\expandafter\section\expanded
{{\@MULTLANG@section@keys{#1}}}%
\endgroup
}
\def\mlsubsection#1%
{%
% group to keep the notfirst-flag local
\begingroup
\expandafter\subsection\expanded
{{\@MULTLANG@section@keys{#1}}}%
\endgroup
}
\def\mlsubsubsection#1%
{%
% group to keep the notfirst-flag local
\begingroup
\expandafter\subsubsection\expanded
{{\@MULTLANG@section@keys{#1}}}%
\endgroup
}
\def\@MULTLANG@missing@value#1%
{%
\ekvifdefinedNoVal{#1}{\@MULTLANG@section@keys{#1}}%
{\ekverr{multilanguage}{Missing value for `#1'}}%
}
\def\@MULTLANG@mlsection#1#2%
{%
\ekvifdefined{MULTLANG/section}{#1}{\@MULTLANG@section@keys{{#1}={#2}}}%
\lang{#1}
{%
\ifcsname @MULTLANG@@flag@notfirst\endcsname
\space/\space
\else
\expandafter\@gobble\csname @MULTLANG@@flag@notfirst\endcsname
\fi
\unexpanded{#2}%
}%
}
\ekvsetdef\@MULTLANG@caption@keys{MULTLANG/section}
% keep in mind that the key will be used in an expanded-context, so we use
% \unexpanded
\ekvdef{MULTLANG/section}{label}{\unexpanded{\label{#1}}}
% default will only be used if no other language was used before it
\ekvdef{MULTLANG/section}{default}
{%
\ifcsname @MULTLANG@@flag@notfirst\endcsname
\expandafter\@gobble
\else
\expandafter\@gobble\csname @MULTLANG@@flag@notfirst\endcsname
\expandafter\@firstofone
\fi
{\unexpanded{#1}}%
}
% every unknown key will be interpreted as a language key
\ekvdefunknown{MULTLANG/caption}
{%
\lang{#2}
{%
\ifcsname @MULTLANG@@flag@notfirst\endcsname
\space/\space
\else
\expandafter\@gobble\csname @MULTLANG@@flag@notfirst\endcsname
\fi
\unexpanded{#1}%
}%
}
\def\mlcaption#1%
{%
% group to keep the notfirst-flag local
\begingroup
\expandafter\caption\expanded
{{\@MULTLANG@caption@keys{#1}}}%
\endgroup
}