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biber來源映射問題

tag-icon • tag-icon biblatex biber
biber來源映射問題

下面是一個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。

據我了解，如果<datetype>date定義了， biber/biblatex 會自動產生<datetype>year,<datetype>month和<datetype>day欄位。

所以sourcemapping程式碼也應該可以這樣寫。

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

但這第二個解決方案不起作用。為什麼？錯誤是什麼？謝謝。

答案1

來源映射步驟（Biber 將變更套用到資料）在檔案處理過程的早期發生.bib。特別是它發生在 Biber 將日期欄位拆分為各個組件的步驟之前。

因此，當\DeclareStyleSourcemap執行時，日期欄位仍然是eventdate（如文件中給出的.bib）eventyear並且朋友尚不可用。

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