如何在BibLaTeX中实现编辑书籍主标题大写并保留斜体

问题 #

参考@samcarter的方法后，已在BibLaTeX参考文献中实现文章、期刊及书籍标题的大写处理。但使用@InBook/@InCollection类型的bib条目时，章节标题大写正常，书籍主标题却未按需求大写。参考chicago-authordate.bbx代码添加\DeclareFieldFormat{booktitle}{\capitalisewords{#1}}后，书籍主标题虽实现大写，却丢失了原本的斜体格式。现需解决如何在保留斜体的同时实现书籍主标题的大写。

测试代码如下：

\documentclass{scrbook}

\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}

% Bibliography
\usepackage[backend=biber, style=chicago-authordate, hyperref=auto, bibencoding=inputenc, refsection=chapter, doi=false, url=false, isbn=false, eprint=false]{biblatex}
\usepackage[babel,autostyle=true]{csquotes}

% Capitalize article titles and journal names
\usepackage{mfirstuc} 
\MFUnocap{a}
\MFUnocap{for}
\MFUnocap{the}
\MFUnocap{of}
\MFUnocap{and}
\MFUnocap{con}
\MFUnocap{il}
\DeclareFieldFormat{jtnoformat}{\capitalisewords{#1}}
\DeclareFieldFormat{stnoformat}{\capitalisewords{#1}}
\DeclareFieldFormat{booktitle}{\capitalisewords{#1}}

\usepackage{xpatch}
\xpatchbibmacro{mag+news+title}{\printfield[noformat]{title}}{\printfield[jtnoformat]{title}}{}{}

\xpatchbibmacro{italtitle+stitle}{\printfield[tnoformat]{title}}{\printfield[jtnoformat]{title}}{}{}

\begin{filecontents*}[overwrite]{sample.bib}
@InBook{Goldthorpe1969,
  title =        "herbert spencer",
  date =         1969,
  author =       "John H. Goldthorpe",
  booktitle =    "The founding fathers of social science",
  editor =       "Timothy Raison",
  publisher =    "Penguin Books",
  location =     "Harmondsworth, UK"}

@InCollection{Turner1999,
  author =       "Bryan S. Turner and Ron Eyerman",
  title =        "The sociology of generations",
  date =         1999,
  booktitle =    "Classical sociology",
  publisher =    "Sage",
  location =     "London",
  chapter =      14,
  pages =        "246--261"}
\end{filecontents*}

\addbibresource{sample.bib}

\begin{document}

\nocite{Goldthorpe1969}.

\nocite{Turner1999}.

\printbibliography

\end{document}

解决方法 #

问题出在直接重新定义booktitle字段格式时，覆盖了chicago-authordate样式默认的斜体设置。要同时保留斜体和实现大写，有两种稳妥的方式：

方式一：在斜体命令内包裹大写处理 #

将原来的\DeclareFieldFormat{booktitle}{\capitalisewords{#1}}替换为：

\DeclareFieldFormat{booktitle}{\mkbibitalic{\capitalisewords{#1}}}

直接用BibLaTeX标准斜体命令\mkbibitalic包裹大写后的标题内容，还原默认的斜体格式。

方式二：用补丁修改原有格式（更推荐） #

如果不确定样式默认的booktitle格式是否包含其他设置，使用xpatch包的\xpatchfieldformat命令修改原有格式，避免完全覆盖：

\usepackage{xpatch}
\xpatchfieldformat{booktitle}{#1}{\capitalisewords{#1}}{}{}

这个命令会在保留原有格式的基础上，仅将字段内容替换为大写后的版本，兼容性更好。

修改后的完整代码示例：

\documentclass{scrbook}

\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}

% Bibliography
\usepackage[backend=biber, style=chicago-authordate, hyperref=auto, bibencoding=inputenc, refsection=chapter, doi=false, url=false, isbn=false, eprint=false]{biblatex}
\usepackage[babel,autostyle=true]{csquotes}

% Capitalize article titles and journal names
\usepackage{mfirstuc} 
\MFUnocap{a}
\MFUnocap{for}
\MFUnocap{the}
\MFUnocap{of}
\MFUnocap{and}
\MFUnocap{con}
\MFUnocap{il}
\DeclareFieldFormat{jtnoformat}{\capitalisewords{#1}}
\DeclareFieldFormat{stnoformat}{\capitalisewords{#1}}
% 替换原来的booktitle定义，二选一即可
\DeclareFieldFormat{booktitle}{\mkbibitalic{\capitalisewords{#1}}}
% 或者用方式二：
% \xpatchfieldformat{booktitle}{#1}{\capitalisewords{#1}}{}{}

\usepackage{xpatch}
\xpatchbibmacro{mag+news+title}{\printfield[noformat]{title}}{\printfield[jtnoformat]{title}}{}{}

\xpatchbibmacro{italtitle+stitle}{\printfield[tnoformat]{title}}{\printfield[jtnoformat]{title}}{}{}

\begin{filecontents*}[overwrite]{sample.bib}
@InBook{Goldthorpe1969,
  title =        "herbert spencer",
  date =         1969,
  author =       "John H. Goldthorpe",
  booktitle =    "The founding fathers of social science",
  editor =       "Timothy Raison",
  publisher =    "Penguin Books",
  location =     "Harmondsworth, UK"}

@InCollection{Turner1999,
  author =       "Bryan S. Turner and Ron Eyerman",
  title =        "The sociology of generations",
  date =         1999,
  booktitle =    "Classical sociology",
  publisher =    "Sage",
  location =     "London",
  chapter =      14,
  pages =        "246--261"}
\end{filecontents*}

\addbibresource{sample.bib}

\begin{document}

\nocite{Goldthorpe1969}.

\nocite{Turner1999}.

\printbibliography

\end{document}

内容的提问来源于stack exchange，提问作者Daniel