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biber 源映射问题

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biber 源映射问题

以下是 mwe：

\begin{filecontents}[overwrite]{\jobname.bib}
@customa{a,
  author = {Author},
  eventdate = {1000-01-01},
  title = {Title},
  journaltitle = {Journaltitle},
  date = {3000},
}
@customa{b,
  author = {Author},
  eventdate = {2000-01-01},
  title = {Title},
  journaltitle = {Journaltitle},
  date = {1000},
}
@customa{c,
  author = {Author},
  eventdate = {3000-01-01},
  title = {Title},
  journaltitle = {Journaltitle},
  date = {2000},
}
@article{article,
  author = {Author},
  title = {Title},
  journaltitle = {Journaltitle},
  date = {2000},
}
\end{filecontents}

\documentclass{article}
\usepackage[style=authortitle]{biblatex}
\addbibresource{\jobname.bib}

\DeclareStyleSourcemap{
  \maps{
    \map{
      \pertype{customa}
      \step[fieldsource=eventdate, match=\regexp{\A(\d+)}]
      \step[fieldset=sortyear, fieldvalue={$1}]
    }
  }
}

\DeclareBibliographyDriver{customa}{%
  \usebibmacro{bibindex}%
  \usebibmacro{begentry}%
  \printnames{author}%
  \newunit
  \printeventdate
  \newunit
  \usebibmacro{title}%
  \newunit\newblock
  \bibstring{in}%
  \printunit{\intitlepunct}
  \usebibmacro{journal+issuetitle}%
  \usebibmacro{finentry}}

\begin{document}
\nocite{*}
\printbibliography
\end{document}

mwe 工作正常。

据我所知，如果<datetype>date定义了，biber/biblatex 会自动生成<datetype>year、<datetype>month和<datetype>day字段。

所以sourcemapping代码也应该可以按照下面的方式写。

\DeclareStyleSourcemap{
  \maps{
    \map{
      \pertype{customa}
      \step[fieldsource=eventyear]
      \step[fieldset=sortyear, origfieldval]
    }
  }
}

但第二个解决方案不起作用。为什么？错误是什么？谢谢。

答案1

源映射步骤（Biber 将您对数据的更改应用于此步骤）在文件处理过程中的早期发生.bib。具体而言，它发生在 Biber 将日期字段拆分为其组件的步骤之前。

因此，在\DeclareStyleSourcemap执行时，日期字段仍然存在eventdate（如文件中所给出的.bib）并且eventyear朋友尚不可用。

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