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使用 biblatex 和 biber 时，额外的 } 或忘记 $

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使用 biblatex 和 biber 时，额外的 } 或忘记 $

我对以下 MWE 的行为感到困惑。据我所知，条目没有任何问题.bib。但是，尝试编译此文档（biblatex v3.3 和 biber v2.4）会导致以下错误：

! Extra }, or forgotten $.
<recently read> }

l.42 

?

如果您进行相关更改natbib以便使用，MWE 就可以很好地编译。

% !TEX encoding = UTF-8 Unicode
% !TEX TS-program = arara
% arara: lualatex: { synctex: no }
% arara: biber
% arara: lualatex: { synctex: yes }

\begin{filecontents*}{\jobname.bib}
@article{belletti1988,
    Author = {Belletti, Adriana and Rizzi, Luigi},
    Doi = {10.1007/BF00133902},
    Journal = {Natural Language \& Linguistic Theory},
    Month = {August},
    Number = {3},
    Pages = {291--352},
    Title = {Psych-Verbs and $\theta$-Theory},
    Volume = {6},
    Year = {1988}}
\end{filecontents*}

\documentclass{article}

\usepackage[american]{babel} 

\usepackage{csquotes} 

\usepackage
  [
    style=apa,
    backend=biber
  ]
  {biblatex}

\DeclareLanguageMapping{american}{american-apa}

\addbibresource{\jobname.bib}

\begin{document}

\textcite{belletti1988}

\printbibliography

\end{document}

.bbl据我所知，生成的文件看起来不错，这让我认为这是一个问题biblatex，但我真的不确定。以下是生成的.bbl文件：

% $ biblatex auxiliary file $
% $ biblatex bbl format version 2.6 $
% Do not modify the above lines!
%
% This is an auxiliary file used by the 'biblatex' package.
% This file may safely be deleted. It will be recreated by
% biber as required.
%
\begingroup
\makeatletter
\@ifundefined{[email protected]}
  {\@latex@error
     {Missing 'biblatex' package}
     {The bibliography requires the 'biblatex' package.}
      \aftergroup\endinput}
  {}
\endgroup


\refsection{0}
  \sortlist[entry]{apa/global}
    \entry{belletti1988}{article}{}
      \name{author}{2}{}{%
        {{uniquename=0,hash=2c14abe3cc130a5e92d3a9be58ce2a7a}{%
           family={Belletti},
           family_i={B\bibinitperiod},
           given={Adriana},
           given_i={A\bibinitperiod}}}%
        {{uniquename=0,hash=3a9997806c8053ebfb136c367b21844b}{%
           family={Rizzi},
           family_i={R\bibinitperiod},
           given={Luigi},
           given_i={L\bibinitperiod}}}%
      }
      \strng{namehash}{fdc76b94e4c47018bee5a5282eb818bb}
      \strng{fullhash}{fdc76b94e4c47018bee5a5282eb818bb}
      \field{sortinit}{B}
      \field{sortinithash}{4ecbea03efd0532989d3836d1a048c32}
      \field{labelyear}{1988}
      \field{labelmonth}{08}
      \field{datelabelsource}{year}
      \field{labelnamesource}{author}
      \field{labeltitlesource}{title}
      \field{journaltitle}{Natural Language \& Linguistic Theory}
      \field{month}{08}
      \field{number}{3}
      \field{title}{Psych-Verbs and $\theta$-Theory}
      \field{volume}{6}
      \field{year}{1988}
      \field{pages}{291\bibrangedash 352}
      \range{pages}{62}
      \verb{doi}
      \verb 10.1007/BF00133902
      \endverb
    \endentry
  \endsortlist
\endrefsection
\endinput

最有趣的是，如果你用$\theta$括号括起来，一切都会正常，例如：

    Title = {Psych-Verbs and {$\theta$}-Theory},

据我所知，Biber 从未要求过这一点biblatex。是我错了，还是这是一个错误？

答案1

的定义\MakeSentenceCase需要允许数学模式。可能的解决方法是

\makeatletter
\def\blx@mksc@init{%
  \blx@mkcp@init
  \def\blx@mkcp@nil{\noexpand\blx@mkcp@nil\noexpand}%
  \def\i{\blx@mkcp@nil\i}\def\j{\blx@mkcp@nil\j}%
  \def\do##1{%
    \ifx##1\relax
    \else
      \def##1{\blx@mkcp@nil##1}%
      \expandafter\do
    \fi}%
  \expandafter\do\@uclclist\relax
  \let\(=$\let\)=$}

\def\blx@mksc@eval{%
  \ifx\@let@token\blx@mksc@end
    \expandafter\blx@mksc@end
  \fi
  \ifx\@let@token\bgroup
    \expandafter\blx@mksc@group
  \fi
  \ifx\@let@token\@sptoken
    \expandafter\blx@mksc@space
  \fi
  \ifx\@let@token\blx@mkcp@nil
    \expandafter\blx@mksc@getone
  \fi
  \ifx\@let@token\blx@mkcp@iec
    \expandafter\blx@mksc@getiec
  \fi
  \ifx\@let@token\blx@mkcp@bbl
    \expandafter\blx@mksc@gettwo
  \fi
  \ifx\@let@token\blx@mkcp@sgl
    \expandafter\blx@mksc@gettwo
  \fi
  \ifx\@let@token\blx@mkcp@dbl
    \expandafter\blx@mksc@getthree
  \fi
  \ifx\@let@token$%
    \expandafter\blx@mksc@getmath
  \fi
  \if\noexpand\@let@token\relax
    \expandafter\blx@mksc@cs
  \fi
  \blx@mksc@other}

\def\blx@mksc@getmath#1\blx@mksc@other$#2${\blx@mksc@other{{$#2$}}}
\makeatother

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