我已经定义了自己的 biblatex 样式（参见 MWE），它使用脚注中的引文。我已经修补了命令prenote，因为否则 biblatex 会以小写形式写入预注文本（注意：我不想在 autocite 命令中以大写形式写入预注，因为我希望能够切换回文本引文）。
但现在我对使用缩写的第三条引文有疑问cf.。下面的 ibid 应该像第二条引文一样以小写字母打印（修补之前，ibid 是用小写字母书写的，cf. 也是如此）。如果没有预注，则 ibid 应该像第四条引文一样打印。
我怎样才能实现所需的行为并摆脱修补，因为它有点慢。
梅威瑟：
\documentclass{article}
\usepackage[style=alphabetic, autocite=footnote,backend=biber,ibidtracker=constrict]{biblatex}
\usepackage{xpatch}
\usepackage{xstring}
\begin{filecontents*}{bibliography.bib}
@BOOK{ABC,
author = {Cornelisse, J. W. and Schöyer, H. Ferry R. and Wakker, Karel F.},
title = {Rocket Propulsion and Spaceflight Dynamics},
year = {1979},
publisher = {Pitman},
}
\end{filecontents*}
\providecommand*{\mkibid}[1]{#1}
\newbool{cbx:loccit}
\DeclareBibliographyOption{ibidpage}[true]{%
\ifstrequal{#1}{true}
{\ExecuteBibliographyOptions{loccittracker=constrict}}
{\ExecuteBibliographyOptions{loccittracker=false}}}
\ExecuteBibliographyOptions{ibidpage = true}
\newbibmacro*{cite:ibid}{%
\global\boolfalse{cbx:loccit}%
\printtext[bibhyperref]{\bibstring[\mkibid]{ibidem}}%
\ifloccit
{\global\booltrue{cbx:loccit}}
{}}
\newbibmacro*{cite:postnote}{%
\ifbool{cbx:loccit}
{}
{\usebibmacro{postnote}}}
\newbibmacro*{cite:prenote}{%
\ifthenelse{\ifciteibid\AND\NOT\iffirstonpage}
{\usebibmacro{prenote}}
{\usebibmacro{prenote}}}
\DeclareCiteCommand{\smartcite}[\iffootnote\mkbibparens\mkbibfootnote]
{\usebibmacro{cite:prenote}}
{\usebibmacro{citeindex}%
\ifthenelse{\ifciteibid\AND\NOT\iffirstonpage}
{\usebibmacro{cite:ibid}\usebibmacro{cite:postnote}}
{\printtext[brackets]{\usebibmacro{cite}\usebibmacro{postnote}}}}
{\multicitedelim}
{}
\DeclareAutoCiteCommand{footnote}[f]{\smartcite}{\smartcites}
\DeclareFieldFormat{sentencecase}{\StrLeft{#1}{1}[\firstchar]\StrLen{#1}[\textlaenge]\StrMid{#1}{2}{\textlaenge}[\restchars]\autocap{\firstchar}\restchars}
\xpatchbibmacro{prenote}{\printfield{prenote}}{\printfield[sentencecase]{prenote}}{}{}
\xpatchbibmacro{multiprenote}{\printfield{multiprenote}}{\printfield[sentencecase]{multiprenote}}{}{}
\bibliography{bibliography.bib}
\begin{document}
Work\autocite[see][20]{ABC}.\\
Same work with a prenote without a punctation\autocite[see][20]{ABC}.\\
Same work with a prenote with punctation\autocite[cf.][20]{ABC}.\\
Same work and no prenote\autocite[][20]{ABC}.
\end{document}
答案1
prenote字段格式的标准定义是\DeclareFieldFormat{prenote}{#1\isdot}，预注中的 any.被视为缩写点（之后我们不开始新的句子，因此不大写）。但是当您定义时sentencecase没有\isdot，因此 every.被视为句号，之后我们会将其大写。
我们可以使用以下定义
\DeclareFieldFormat{prenote}{%
\StrLeft{#1}{1}[\firstchar]%
\StrLen{#1}[\textlaenge]%
\StrMid{#1}{2}{\textlaenge}[\restchars]%
\autocap{\firstchar}\restchars\isdot}
\DeclareFieldAlias{multiprenote}{prenote}
那么就不需要使用xpatch修补prenote宏了，因为我们直接更改字段格式。
平均能量损失
\documentclass{article}
\usepackage[style=alphabetic, autocite=footnote,backend=biber,ibidtracker=constrict]{biblatex}
\usepackage{xstring}
\providecommand*{\mkibid}[1]{#1}
\newbool{cbx:loccit}
\DeclareBibliographyOption{ibidpage}[true]{%
\ifstrequal{#1}{true}
{\ExecuteBibliographyOptions{loccittracker=constrict}}
{\ExecuteBibliographyOptions{loccittracker=false}}}
\ExecuteBibliographyOptions{ibidpage = true}
\newbibmacro*{cite:ibid}{%
\global\boolfalse{cbx:loccit}%
\printtext[bibhyperref]{\bibstring[\mkibid]{ibidem}}%
\ifloccit
{\global\booltrue{cbx:loccit}}
{}}
\newbibmacro*{cite:postnote}{%
\ifbool{cbx:loccit}
{}
{\usebibmacro{postnote}}}
\newbibmacro*{cite:prenote}{%
\ifthenelse{\ifciteibid\AND\NOT\iffirstonpage}
{\usebibmacro{prenote}}
{\usebibmacro{prenote}}}
\DeclareCiteCommand{\smartcite}[\iffootnote\mkbibparens\mkbibfootnote]
{\usebibmacro{cite:prenote}}
{\usebibmacro{citeindex}%
\ifthenelse{\ifciteibid\AND\NOT\iffirstonpage}
{\usebibmacro{cite:ibid}\usebibmacro{cite:postnote}}
{\printtext[brackets]{\usebibmacro{cite}\usebibmacro{postnote}}}}
{\multicitedelim}
{}
\DeclareAutoCiteCommand{footnote}[f]{\smartcite}{\smartcites}
\DeclareFieldFormat{prenote}{%
\StrLeft{#1}{1}[\firstchar]%
\StrLen{#1}[\textlaenge]%
\StrMid{#1}{2}{\textlaenge}[\restchars]%
\autocap{\firstchar}\restchars\isdot}
\DeclareFieldAlias{multiprenote}{prenote}
\bibliography{biblatex-examples.bib}
\begin{document}
Work\autocite[see][20]{sigfridsson}.\\
Same work with a prenote without a punctation\autocite[see][20]{sigfridsson}.\\
Same work with a prenote with punctation\autocite[cf.][20]{sigfridsson}.\\
Same work and no prenote\autocite[][20]{sigfridsson}.
\end{document}
