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%    \begin{macrocode}
    url,
%    \end{macrocode}
% \pkg{emptypage} 用于清除空白页的页码。
%    \begin{macrocode}
    emptypage,
%    \end{macrocode}
% 南京大学视觉形象化标准宏包 \pkg{njuvisual} 用于绘制学校 logo。
%    \begin{macrocode}
    njuvisual,
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%    \end{macrocode}
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% 数学,\pkg{amsmath} 必须在 \pkg{unicode-math} 前加载。
% \pkg{unicode-math} 指定了 \hologo{XeTeX} 和 \hologo{LuaTeX} 下所使用的数学字体。
% 用于配置数学环境的 \pkg{mathtools} 会与 \pkg{unicode-math} 发生冲突,此处手动消除其警告。
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%    \begin{macrocode}
    amsmath,
    amsthm,
    mathtools,
    thmtools,
    unicode-math,
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%    \end{macrocode}
% 图片与表格。
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%    \begin{macrocode}
    graphicx,
    wrapfig,
    booktabs,
    multirow,
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%    \end{macrocode}
% 列表环境
    listings,
    enumitem,
%    \end{macrocode}
% 按以下顺序加载两个关于引用的包。
% \pkg{hyperref} 覆写了大量命令,因此需要在其他包最后载入。
% 仅有 \pkg{cleveref} 需要在 \pkg{hyperref} 后载入,否则会报错。
%    \begin{macrocode}
    hyperref,
    cleveref
  }
% \begin{macro}{\njuline}
% 针对编译引擎,使用不同的宏包构建可以对中文正常换行的下划线命令。
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%    \begin{macrocode}
\sys_if_engine_xetex:T
  {
    \RequirePackage{xeCJKfntef,microtype}
    \NewDocumentCommand \njuline { m } { \CJKunderline{#1} }
  }
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%    \end{macrocode}
% \pkg{lua-ul} 中需要在结尾使用 \tn{null} 保护尾部空白。
\sys_if_engine_luatex:T
  {
    \RequirePackage{lua-ul,dashundergaps}
    \NewDocumentCommand \njuline { m } { \underLine{#1} \null }
  }
% \end{macro}
% \begin{macro}{\@@_check_package:nnn}
% 检查过时宏包。
%    \begin{macrocode}
\msg_new:nnn { njuthesis } { package-too-old }
  {
    Package~ "#1"~ is~ too~ old. \\
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    The~ njuthesis~ class~ only~ supports~ "#1"~ with~
    a~ version higher~ than~ v#2.\\
    Please~ update~ an~ up-to-date~ version~ of~ it~
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    using~ your TeX~ package~ manager~ or~ from~ CTAN.
  }
\cs_new_protected:Npn \@@_check_package:nnn #1#2#3
  {
    \@ifpackagelater {#1} {#2}
      { } { \msg_error:nnnn { njuthesis } { package-too-old } {#1} {#3} }
  }
%    \end{macrocode}
% \end{macro}
%
% 检查绘制下划线所需的 \pkg{luatexja} 包版本。该宏包在2021-09-18的更新解决了下划线中断问题,然而在2021-10-24的更新才提供了正确的内嵌日期。
%    \begin{macrocode}
\sys_if_engine_luatex:T
  { \@@_check_package:nnn { luatexja } { 2021/10/24 } { 20211024.0 } }
%    \end{macrocode}
%
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% \subsection{字体设置}
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% \pkg{fontspec} 已在 C\hologo{TeX} 套件中包含,无需另外载入。
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% \subsubsection{操作系统检测}
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% 判断用户是否自定义了中英文字体。如果其中任意一种未被定义,
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% 则使用系统预装字体覆盖字体选项。
%    \begin{macrocode}
\tl_if_empty:NTF \g_@@_latin_fontset_tl
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  { \bool_gset_true:N \g_@@_load_system_fontset_bool }  
  {  
    \tl_if_empty:NT \g_@@_cjk_fontset_tl
      { \bool_gset_true:N \g_@@_load_system_fontset_bool }  
  }
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%    \end{macrocode}
%
% 进行系统检测。
% 检测 Windows 的命令由\pkg{l3kernal}提供,
% 检测 macOS 的命令由\pkg{ctex}提供,
% 这两种情况外的系统被判断为 Linux,一律使用自由字体。
%    \begin{macrocode}
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\bool_if:NT \g_@@_load_system_fontset_bool
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  { 
    \sys_if_platform_windows:TF
      { \tl_set:Nn \g_@@_latin_fontset_tl   { windows }
        \tl_set:Nn \g_@@_cjk_fontset_tl     { windows } }
      { \ctex_if_platform_macos:TF
        { \tl_set:Nn \g_@@_latin_fontset_tl { macos   }
          \tl_set:Nn \g_@@_cjk_fontset_tl   { macos   } }
        { \tl_set:Nn \g_@@_latin_fontset_tl { gyre    }
          \tl_set:Nn \g_@@_cjk_fontset_tl   { fandol  } } } 
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% \subsubsection{定义英文字库}
%
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% 接下来逐个定义所需要使用的字库。
%
% \begin{macro}{\@@_load_latin_font_windows:}
% Windows 西文字体
%    \begin{macrocode}
\cs_new_protected:Npn \@@_load_latin_font_windows:
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  {
    \setmainfont{Times~New~Roman}
    \setsansfont{Arial}
    \setmonofont{Courier~New}[Scale=MatchLowercase]
  }
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%    \end{macrocode}
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%
% \begin{macro}{\@@_load_latin_font_macos:}
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% macOS 西文字体。
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%    \begin{macrocode}
\cs_new_protected:Npn \@@_load_latin_font_macos:
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  {
    \setmainfont{Times~New~Roman}
    \setsansfont{Arial}
    \setmonofont{Menlo}[Scale=MatchLowercase]
  }
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%    \end{macrocode}
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%
% \begin{macro}{\@@_load_latin_font_gyre:}
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% 开源的 gyre 西文字体。
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%    \begin{macrocode}
\cs_new_protected:Npn \@@_load_latin_font_gyre:
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  {
    \setmainfont{texgyretermes}[
      Extension=.otf,
      UprightFont=*-regular,
      BoldFont=*-bold,
      ItalicFont=*-italic,
      BoldItalicFont=*-bolditalic]
    \setsansfont{texgyreheros}[
      Extension=.otf,
      UprightFont=*-regular,
      BoldFont=*-bold,
      ItalicFont=*-italic,
      BoldItalicFont=*-bolditalic]
    \setmonofont{texgyrecursor}[
      Extension=.otf,
      UprightFont=*-regular,
      BoldFont=*-bold,
      ItalicFont=*-italic,
      BoldItalicFont=*-bolditalic,
      Scale=MatchLowercase,
      Ligatures=CommonOff]
  }
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%    \end{macrocode}
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%
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% \subsubsection{定义中文字库}
%
% \begin{macro}{\@@_load_cjk_font_windows:}
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% Windows 中文字体。
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%    \begin{macrocode}
\cs_new_protected:Npn \@@_load_cjk_font_windows:
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  {
    \setCJKmainfont{SimSun}[
      AutoFakeBold=2.17, 
      ItalicFont=KaiTi]
    \setCJKsansfont{SimHei}
    \setCJKmonofont{FangSong}
    \setCJKfamilyfont{zhsong}{SimSun}[AutoFakeBold=2.17]
    \setCJKfamilyfont{zhhei}{SimHei}
    \setCJKfamilyfont{zhfs}{FangSong}
    \setCJKfamilyfont{zhkai}{KaiTi}[AutoFakeBold=2.17]
  }
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%    \end{macrocode}
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%
%
% \begin{macro}{\@@_load_cjk_font_macos:}
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% macOS 字体。
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% TODO: 修复 macOS 字体支持,实现开箱即用。
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%    \begin{macrocode}
\cs_new_protected:Npn \@@_load_cjk_font_macos:
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  {
    % 移除 does not contain script "CJK" 警告
    \msg_redirect_name:nnn {fontspec} {no-script} {info} 
    \setCJKmainfont{Songti~SC~Light}[
      BoldFont=Songti~SC~Bold,
      ItalicFont=Kaiti~SC,
      BoldItalicFont=Kaiti~SC~Bold]
    \setCJKsansfont{Heiti~SC~Light}[BoldFont=Heiti~SC~Medium]
    \setCJKmonofont{STFangsong}
    \setCJKfamilyfont{zhsong}{Songti~SC~Light}[BoldFont=Songti~SC~Bold]
    \setCJKfamilyfont{zhhei}{Heiti~SC~Light}[BoldFont=Heiti~SC~Medium]
    \setCJKfamilyfont{zhfs}{STFangsong}
    \setCJKfamilyfont{zhkai}{Kaiti~SC}[BoldFont=Kaiti~SC~Bold]
    \setCJKfamilyfont{zhnewhei}{PingFang~SC}
  }
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%    \end{macrocode}
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%
% \begin{macro}{\@@_load_cjk_font_fandol:}
% Fandol 字体
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%    \begin{macrocode}
\cs_new_protected:Npn \@@_load_cjk_font_fandol:
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  {
    % 移除 does not contain script "CJK" 警告
    \msg_redirect_name:nnn {fontspec} {no-script} {info} 
    \setCJKmainfont{FandolSong-Regular}[
      Extension=.otf,
      BoldFont=FandolSong-Bold,
      ItalicFont=FandolKai-Regular]
    \setCJKsansfont{FandolHei-Regular}[
      Extension=.otf,
      BoldFont=FandolHei-Bold]
    \setCJKmonofont{FandolFang-Regular}[Extension=.otf]
    \setCJKfamilyfont{zhsong}{FandolSong-Regular}[
      Extension=.otf,
      BoldFont=FandolSong-Bold]
    \setCJKfamilyfont{zhhei}{FandolHei-Regular}[
      Extension=.otf,
      BoldFont=FandolHei-Bold]
    \setCJKfamilyfont{zhfs}{FandolFang-Regular}[Extension=.otf]
    \setCJKfamilyfont{zhkai}{FandolKai-Regular}[
      Extension=.otf,
      AutoFakeBold=2.17]
  }
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%    \end{macrocode}
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%
%
% \begin{macro}{\@@_load_cjk_font_founder:}
% 方正字库(简繁扩展)
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%    \begin{macrocode}
\cs_new_protected:Npn \@@_load_cjk_font_founder:
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    \sys_if_engine_luatex:T
    {
%    \end{macrocode}
% 在 LuaTeX 中调整方正字体括号位置
% XeTeX 暂无好的解决方法
%    \begin{macrocode}
      \defaultCJKfontfeatures{JFM={zh_CN/{quanjiao,fzpr}}}
    }
    \setCJKmainfont{FZSSK}[% 方正书宋
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      BoldFont=FZXBSK,% 方正小标宋
      ItalicFont=FZKTK]% 方正楷体
    \setCJKsansfont{FZXH1K}[% 方正细黑一
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      BoldFont=FZHTK]% FZHTK 方正黑体
    \setCJKmonofont{FZFSK}[Extension=.ttf]% 方正仿宋
    \setCJKfamilyfont{zhsong}
      {FZSSK}[
        Extension=.ttf,
        BoldFont=FZXBSK]
    \setCJKfamilyfont{zhhei}
      {FZHTK}[
        Extension=.ttf,
        AutoFakeBold=2.17]
    \setCJKfamilyfont{zhfs}
      {FZFSK}[Extension=.ttf]
    \setCJKfamilyfont{zhkai}
      {FZKTK}[Extension=.ttf]
    \defaultCJKfontfeatures{}
  }
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%    \end{macrocode}
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%
%
% \begin{macro}{\@@_load_cjk_font_noto:}
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% 思源字体。
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%    \begin{macrocode}
\cs_new_protected:Npn \@@_load_cjk_font_noto:
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  {
    % 思源宋体
    \setCJKmainfont[
      UprightFont=NotoSerifSC-Regular,
      BoldFont=NotoSerifSC-Bold,
      ItalicFont=NotoSerifSC-Regular,
      BoldItalicFont=NotoSerifSC-Bold,
      ItalicFeatures=FakeSlant,
      BoldItalicFeatures=FakeSlant]{Noto~Serif~SC}
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    % 思源黑体
    \setCJKsansfont[
      UprightFont=NotoSansSC-Regular,
      BoldFont=NotoSansSC-Bold,
      ItalicFont=NotoSansSC-Regular,
      BoldItalicFont=NotoSansSC-Bold,
      ItalicFeatures=FakeSlant,
      BoldItalicFeatures=FakeSlant]{Noto~Sans~SC}
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    \setCJKmonofont{FZFSK}[Extension=.ttf]% 方正仿宋
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    \setCJKfamilyfont{zhsong}{Noto~Serif~SC}
    \setCJKfamilyfont{zhhei}{Noto~Sans~SC}
    \setCJKfamilyfont{zhfs}{FZFSK}[Extension=.ttf]
    \setCJKfamilyfont{zhkai}{FZKTK}[Extension=.ttf]
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%    \end{macrocode}
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%
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% \subsubsection{载入指定字库}
%
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% 载入字体命令。
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%    \begin{macrocode}
\cs_new_protected:Npn \@@_load_font:
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  {
    \use:c { @@_load_latin_font_ \g_@@_latin_fontset_tl : }
    \use:c { @@_load_cjk_font_   \g_@@_cjk_fontset_tl   : }
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%    \end{macrocode}
% 自行定义C\hologo{TeX}中的四类字体命令。
%    \begin{macrocode}
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    \NewDocumentCommand \songti   { } { \CJKfamily{zhsong} }
    \NewDocumentCommand \heiti    { } { \CJKfamily{zhhei}  }
    \NewDocumentCommand \fangsong { } { \CJKfamily{zhfs}   }
    \NewDocumentCommand \kaishu   { } { \CJKfamily{zhkai}  }
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    \RenewDocumentCommand \large { } { \zihao{4} }
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%    \end{macrocode}
%
% 载入设置的字体。
%    \begin{macrocode}
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%    \end{macrocode}
%
% \changes{v0.10}{2021/09/28}{修正了数学字体。}
%
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% 设置数学字体 (XITS, 或者 \href{https://www.stixfonts.org}{STIX}, 与 Times New Roman 最为相近)
% \setmathfont{STIXTwoMath-Regular}[Extension = .otf]
\setmathfont{XITSMath-Regular}[
  BoldFont = XITSMath-Bold,
  Extension = .otf]
\setmathfont{latinmodern-math.otf}[range={cal,bb,frak}]
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%    \end{macrocode}
%
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% \subsection{页面布局}
%
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% \subsubsection{页边距}
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% 使用\pkg{geometry}设置页边距。
%    \begin{macrocode}
\geometry
  {
    vmargin    = 2.5 cm,
    hmargin    = 3.2 cm, 
    headheight = 15 pt
  }
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%    \end{macrocode}
%
% \subsubsection{页眉页脚}
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%
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% 本科生页眉页脚。要求无页眉,页脚居中,页码使用五号新罗马体数字。
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%    \begin{macrocode}
\fancypagestyle { plain }
  {
    \fancyhf { }       
    \fancyfoot [ C ] { \zihao{5} \thepage }
    \RenewDocumentCommand \headrulewidth { } { 0 pt }
    \RenewDocumentCommand \footrulewidth { } { 0 pt }
  }
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%    \end{macrocode}
%
% 研究生页眉页脚。奇数页为章名,偶数页为节名。 
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%    \begin{macrocode}
\fancypagestyle{headings}
  {
    \fancyhf { }
    \fancyhead [ CO ] { \leftmark          }
    \fancyhead [ CE ] { \rightmark         }
    \fancyfoot [ C  ] { \zihao{5} \thepage }
    \RenewDocumentCommand \headrulewidth { } { 0   pt }
    \RenewDocumentCommand \footrulewidth { } { 0.4 pt }
    \setlength { \headheight } { 20 pt } 
  }
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%    \end{macrocode}
%
% \begin{macro}{\frontmatter}
% 重定义 \cs{frontmatter},清空页眉页脚以及页码设置。
% 此命令仅为解决原 \cls{book} 类中使用小写罗马字母序号的冲突,并不建议使用。
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%    \begin{macrocode}
\RenewDocumentCommand \frontmatter { }
  { 
    \cleardoublepage
    \pagestyle{empty}
    \pagenumbering{Roman}
  }
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%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\mainmatter}
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% \changes{v0.12}{2021/12/03}{修复了摘要页字体格式泄漏到正文的问题。}
% \changes{v0.12}{2021/12/03}{修复了页眉上长标题重叠的问题。}
% 重定义 \cs{mainmatter},在论文主体部分载入页眉页脚设置,并重新进行数字编号。
%    \begin{macrocode}
\RenewDocumentCommand \mainmatter { }
  {
    \cleardoublepage
    \int_compare:nTF { \g_@@_info_degree_int == 1 } 
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      { \pagestyle{plain} } { \pagestyle{headings} }
    \pagenumbering{arabic}
    \normalfont\normalsize
  }
%    \end{macrocode}
% \end{macro}
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%
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% \subsection{章节标题格式}
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% \begin{macro}{\c_@@_section_format_tl}
% 各部分章节以及目录中章标题的格式。设置为四号、不加粗、黑体。
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%    \begin{macrocode}
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\tl_const:Nn \c_@@_section_format_tl { \large \normalfont \sffamily }
%    \end{macrocode}
% \end{macro}
%
%    \begin{macrocode}
\ctexset
  {
    chapter/beforeskip   = 10 pt,
    chapter/afterskip    = 60 pt,
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    chapter/format       = \centering \c_@@_section_format_tl,
    section/format       = \c_@@_section_format_tl,
    subsection/format    = \c_@@_section_format_tl,
    subsubsection/format = \c_@@_section_format_tl
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%    \end{macrocode}
%
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% \subsection{目录格式}
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% \changes{v0.13}{2021/12/09}{删除 \pkg{tocloft},改用 \pkg{ctex} 内置的目录设置。}
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% \begin{macro}{\@@_chapter_in_toc:n}
% 将无编号章插入目录。
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\cs_new_protected:Npn \@@_chapter_in_toc:n #1
  { \addcontentsline { toc } { chapter } { \c_@@_section_format_tl #1 } }
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% \begin{macro}{\njuchapter}
% 含有目录和 PDF 标签的无编号章。
%    \begin{macrocode}
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\NewDocumentCommand \njuchapter { m }
  { \chapter*{#1} \addcontentsline { toc } { chapter }
      { \c_@@_section_format_tl #1} }
%    \end{macrocode}
% \end{macro}
%
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%    \begin{macrocode}
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\ctexset
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%    \end{macrocode}
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% 设置目录标题名称。
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%    \begin{macrocode}
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    contentsname   = {目\hspace{2em}录},
    listfigurename = {插图清单}, 
    listtablename  = {表格清单},
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%    \end{macrocode}
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% 设置目录中章标题的样式。
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%    \begin{macrocode}
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    chapter / tocline = \c_@@_section_format_tl \CTEXnumberline {#1} #2
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%    \end{macrocode}
%
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% \begin{macro}{\c_@@_toc_title_tl}
% 目录页标题格式,单独设置为三号粗宋体。
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%    \begin{macrocode}
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\tl_const:Nn \c_@@_toc_title_tl { \centering \zihao{3} \bf }
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%    \end{macrocode}
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% \end{macro}
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%
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% \begin{macro}{\@@_modify_toc_title:nn}
% 通过 group 内修改标题设置,改变标题页字体。
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%    \begin{macrocode}
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\cs_new_protected:Npn \@@_modify_toc_title:nn #1#2
{
  \group_begin:
    \ctexset { chapter/format = \c_@@_toc_title_tl }
    \njuchapter{#1}
  \group_end:
  \@starttoc{#2}
}
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%    \end{macrocode}
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% \end{macro}
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%
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% \begin{macro}{\tableofcontents,\listoffigures,\listoftables}
% 重定义目录命令,修改标题格式并插入书签。
%    \begin{macrocode}
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\RenewDocumentCommand \tableofcontents { }
  { \@@_modify_toc_title:nn { \contentsname   } { toc } }
\RenewDocumentCommand \listoffigures   { }
  { \@@_modify_toc_title:nn { \listfigurename } { lof } }
\RenewDocumentCommand \listoftables    { }
  { \@@_modify_toc_title:nn { \listtablename  } { lot } }
%    \end{macrocode}
% \end{macro}
%
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% \subsection{参考文献}
% biblatex设置
\RequirePackage[
    style=gb7714-2015,
    %style=numeric-comp,
    %citestyle=authortitle-icomp,
    % citestyle=numeric-comp,
    %bibstyle=authoryear,
    % bibstyle=numeric,
    sorting=none,
    %sorting=nyt,
    %sortcites=true,
    %autocite=footnote,
    backend=biber, % Compile the bibliography with biber
    hyperref=true,
    backref=false,
    citecounter=true,
    pagetracker=true,
    citetracker=true,
    ibidtracker=context,
    autopunct=true,
    autocite=plain,
    % gbpub=false,         % Uncomment if you do NOT want '[S.l. : s.n.]' 
                           % in reference entries, GitHub Issue (#47)
    % gbnamefmt=lowercase, % Uncomment if you do NOT want uppercase author 
                           % names in reference entries, GitHub Issue (#23)
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%    \end{macrocode}
%
% \changes{v0.12}{2021/12/06}{设置输出参考文献的默认选项。}
% 设置参考文献名称
%    \begin{macrocode}
\ctexset{ bibname = {参考文献} }
%    \end{macrocode}
% 将参考文献插入目录
%    \begin{macrocode}
\DeclarePrintbibliographyDefaults{ heading = bibintoc }
%    \end{macrocode}
%
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% 忽略不需要的文献信息。
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%    \begin{macrocode}
\AtEveryBibitem{
	\clearfield{abstract}
	\clearfield{issn}
	\clearfield{isbn}
	\clearfield{archivePrefix}
	\clearfield{arxivId}
	\clearfield{pmid}
	\clearfield{eprint}
	\ifentrytype{online}{}{\ifentrytype{misc}{}{\clearfield{url}}}
}
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%    \end{macrocode}
%
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% \subsection{引用}
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%
% \pkg{hyperref} 设置。
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% \changes{v0.11}{2021/10/01}{写入PDF元数据。}
%    \begin{macrocode}
\ctex_at_end_preamble:n
%    \end{macrocode}
% 清除标题中用于手动换行的 |!| 控制符。
%    \begin{macrocode}
    \tl_set_eq:NN \l_@@_tmpb_tl \l_@@_info_title_tl
    \tl_remove_all:Nn \l_@@_tmpb_tl { ! }
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    \hypersetup
      {
        bookmarksnumbered = true,
        psdextra          = true,
        unicode           = true,
        hidelinks,
%    \end{macrocode}
% 填写 PDF 元信息。
%    \begin{macrocode}
        pdftitle    = \l_@@_tmpb_tl,
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        pdfauthor   = \l_@@_info_author_tl,
        pdfkeywords = \l_@@_info_keywords_clist,
        pdfcreator  = \c_@@_name_pdf_creator_tl
      }
  }
%    \end{macrocode}
% 修改 \pkg{cleverref} 的标签名称。默认在名称后面添加空格,删除公式编号的括号
%    \begin{macrocode}
\crefdefaultlabelformat{#2#1#3\,}
\crefname { figure   } { 图   } { 图 }
\crefname { table    } { 表   } { 表 }
\crefname { appendix } { 附录 } { 附录 }
\crefformat { equation      } { 公式~#2#1#3~   }
\crefformat { chapter       } { 第#2#1#3章     }
\crefformat { section       } { 第~#2#1#3~节   }
\crefformat { subsection    } { 第~#2#1#3~小节 }
\crefformat { subsubsection } { 第~#2#1#3~小节 }
% \crefname{assumption}{假设}{假设}
% \crefname{axiom}{公理}{公理}
% \crefname{conclusion}{结论}{结论}
% \crefname{condition}{条件}{条件}
% \crefname{corollary}{推论}{推论}
% \crefname{definition}{定义}{定义}
% \crefname{lemma}{引理}{引理}
% \crefname{property}{性质}{性质}
% \crefname{proposition}{命题}{命题}
% \crefname{remark}{注解}{注解}
%    \end{macrocode}
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% \subsection{图表浮动体}
% 
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% \subsubsection{图片表格}
%
% 设置默认图片扩展名,允许在不键入扩展名时自动进行补全。
%    \begin{macrocode}
\DeclareGraphicsExtensions{.pdf,.eps,.jpg,.png}
%    \end{macrocode}
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% 
% \changes{v0.12}{2021/12/06}{删除了可能导致冲突的 \pkg{floatrow}。}
% 图表标题样式。文字设置为五号宋体,标签设置为粗体,间隔一个全角空格。
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%    \begin{macrocode}
\DeclareCaptionStyle{njucap}
  {
    font          = small,
    labelfont     = bf,
    labelsep      = quad,
    justification = centering
  }
\captionsetup [ figure ] { style = njucap }
\captionsetup [ table  ] { style = njucap }
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%    \end{macrocode}
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%
% \subsubsection{代码环境}
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% 
% 使用 \pkg{listings} 提供的 \tn{lstset} 设置代码环境基本样式。
%    \begin{macrocode}
\lstset
  {
    basewidth    = 0.5 em,
    lineskip     = 3 pt,
    basicstyle   = \small\ttfamily,
    keywordstyle = \bfseries,
    commentstyle = \itshape,
    numbers      = left,
    captionpos   = t,
    breaklines   = true,
    xleftmargin  = 2 em,
    xrightmargin = 2 em,
    flexiblecolumns
  }
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%    \end{macrocode}
%
%
% \subsubsection{列表环境}
% \changes{v0.12}{2021/12/07}{删除了 \pkg{enumitem} 的部分列表环境设置。}
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%    \begin{macrocode}
\setlist { noitemsep }
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%    \end{macrocode}
%
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% \subsection{定理环境}
%
% \begin{macro}{\mathbi}
% Math bold italic letters
%    \begin{macrocode}
\NewDocumentCommand\mathbi{m}{\textbf{\em #1}}
%    \end{macrocode}
% \end{macro}
%
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%    \begin{macrocode}
% TODO: 简化数学环境的定义方法
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%    \end{macrocode}
%
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% \subsection{封面}
%
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% \subsubsection{内部命令}
% \begin{macro}{\@@_split_title:n}
% 分割标题。
%    \begin{macrocode}
\cs_new_protected:Npn \@@_split_title:n #1
    \tl_if_in:VnTF { #1 } { ! }
      {
%    \end{macrocode}
% 从英文感叹号进行分割,存入 |clist|。
%    \begin{macrocode}
        \seq_set_split:NnV \l_@@_tmpa_seq { ! } { #1 }
        \clist_set_from_seq:NN \l_@@_tmpa_clist \l_@@_tmpa_seq
      }
      { 
%    \end{macrocode}
% 如果没找到感叹号,则手动进行分割固定宽度的字符。
%    \begin{macrocode}
        \@@_put_inempty_seg:nnn { #1 } { 1  } { 15 }
        \@@_put_inempty_seg:nnn { #1 } { 16 } { 15 }
        \@@_put_inempty_seg:nnn { #1 } { 31 } { 15 }
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%
% \begin{macro}{\@@_multiline_title:nnn}
% 生成多行标题。
% \begin{arguments}
%   \item 内容格式
%   \item 名称盒子宽度,|dim| 型变量
%   \item 内容盒子宽度,|dim| 型变量
% \end{arguments}
%    \begin{macrocode}
\cs_new_protected:Npn \@@_multiline_title:nnn #1#2#3
    \@@_split_title:n { \l_@@_info_title_tl }
    \@@_spread_box:nnn { #2 } { \kaishu } { \c_@@_name_title_tl }
    \@@_hskip:
    \clist_map_inline:Nn \l_@@_tmpa_clist
      { \@@_ulined_center_box:nn { #3 } { #1 ##1 } \@@_vskip: }
  }
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\@@_print_entry:nnn}
% 生成单项信息条目。
% \begin{arguments}
%   \item 条目
%   \item 名称盒子宽度,|dim| 型变量
%   \item 内容盒子宽度,|dim| 型变量
% \end{arguments}
%    \begin{macrocode}
\cs_new_protected:Npn \@@_print_entry:nnn #1#2#3
    \@@_spread_box:nnn { #2 } { \kaishu } { \@@_name:n { #1 } }
    \@@_ulined_center_box:nn  { #3 }      { \@@_info:n { #1 } }
% \begin{macro}{\@@_print_bientry:nnnn}
% 生成两项信息条目,仅用于本科生封面。
% \begin{arguments}
%   \item 左侧条目
%   \item 右侧条目
%   \item 名称盒子宽度,|dim| 型变量
%   \item 内容盒子宽度,|dim| 型变量
% \end{arguments}
%    \begin{macrocode}
\cs_new_protected:Npn \@@_print_bientry:nnnn #1#2#3#4
    \@@_spread_box:nnn { #3 } { \kaishu } { \@@_name:n { #1 } }
    \@@_ulined_center_box:nn  { #4 }      { \@@_info:n { #1 } }
    \skip_horizontal:n { 0.5 em }
    \@@_spread_box:nnn { #3 } { \kaishu } { \@@_name:n { #2 } }
    \@@_ulined_center_box:nn  { #4 }      { \@@_info:n { #2 } }
%
% \subsubsection{绘制部件}
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%
% \begin{macro}{\@@_cover_title_ug:}
% 本科生封面标题。
%    \begin{macrocode}
\cs_new_protected:Npn \@@_cover_title_ug:
  { \@@_spread_box:nnn { 9em } { \bf } { \l_@@_info_type_tl } }
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\@@_cover_info_ug:nnn}
% 本科生封面信息栏。
% \begin{arguments}
%   \item 名称盒子宽度,|dim| 型变量
%   \item 长内容盒子宽度,|dim| 型变量
%   \item 短内容盒子宽度,|dim| 型变量
% \end{arguments}
%    \begin{macrocode}
\cs_new_protected:Npn \@@_cover_info_ug:nnn #1#2#3
    \begin{minipage} [ c ] { #1 + #2 + 0.3 em }
      \@@_print_entry:nnn { dept            } { #1 } { #2 }
      \@@_print_entry:nnn { major           } { #1 } { #2 }
      \@@_multiline_title:nnn   { \bf } { #1 } { #2 }
      \@@_print_bientry:nnnn { grade } { id } { #1 } { #3 }
      \@@_print_entry:nnn { author          } { #1 } { #2 }
      \@@_print_bientry:nnnn { supv } { supv_ttl } { #1 } { #3 }
      \tl_if_blank:VF { \l_@@_info_supv_ii_tl }
        { \@@_print_bientry:nnnn { supv_ii } { supv_ttl } { #1 } { #3 } }
      \@@_print_entry:nnn { sm_date     } { #1 } { #2 }
    \end{minipage} 
  }
%    \end{macrocode}
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%
% \begin{macro}{\@@_cover_title_g:}
% 研究生封面标题。
%    \begin{macrocode}
\cs_new_protected:Npn \@@_cover_title_g:
  {
    \@@_spread_box:nnn { 9em } { } { \l_@@_info_type_tl } \@@_vskip:
    \c_@@_name_degree_l_tl \l_@@_info_degree_tl \c_@@_name_degree_r_tl
  }
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\@@_cover_info_g:nn}
% 研究生封面信息栏。
% \begin{arguments}
%   \item 名称盒子宽度,|dim| 型变量
%   \item 内容盒子宽度,|dim| 型变量
% \end{arguments}
%    \begin{macrocode}
\cs_new_protected:Npn \@@_cover_info_g:nn #1#2
  {
    \begin{minipage} [ c ] { #1 + #2 + 0.3 em }
      \raggedleft
      \@@_multiline_title:nnn { } { #1 } { #2 }
      \clist_put_right:Nn \l_@@_tmpb_clist { author, major, field, supv_full }
      \clist_map_inline:Nn \l_@@_tmpb_clist
        { \@@_print_entry:nnn { ##1 } { #1 } { #2 } }
    \end{minipage}
  }
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\@@_cover_back_g:}
% 研究生封面背面信息。
%    \begin{macrocode}
\cs_new_protected:Npn \@@_cover_back_g:
  {
    \@@_spread_box:nnn { 6.2 em } { \kaishu } { \c_@@_name_id_tl }
    { : \@@_quad: } \l_@@_info_id_tl
    \@@_vskip:
    \@@_spread_box:nnn { 6.2 em } { \kaishu } { \c_@@_name_df_date_tl }
    { : \@@_quad: } \l_@@_info_df_date_tl
    \@@_vskip:
    \@@_spread_box:nnn { 6.2 em } { \kaishu } { \c_@@_name_supv_full_tl }
    { : \@@_quad: } \skip_horizontal:n { 8 em } \c_@@_name_sign_tl
  }
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\@@_cover_en_g:}
% 研究生英文封面。
%    \begin{macrocode}
\cs_new_protected:Npn \@@_cover_en_g:
  {
%    \end{macrocode}
% 标题。
%    \begin{macrocode}
      \parbox { \textwidth }
        { \centering \bf \sffamily \zihao { 2 } \l_@@_info_title_en_tl }
      \skip_vertical:n { 1 cm }
%    \end{macrocode}
% 作者。
%    \begin{macrocode}
      \group_begin: \zihao { 4 } { by } \group_end: \@@_vskip:
      \group_begin: 
        \bf \sffamily \zihao { 4 } \l_@@_info_author_en_tl
      \group_end: \skip_vertical:n { 1 cm }
%    \end{macrocode}
% 导师。
%    \begin{macrocode}
      \group_begin: \zihao { 4 } { Supervised~ by } \group_end: \@@_vskip:
      \group_begin:
        \sffamily \zihao { 4 } \l_@@_info_supv_full_en_tl
      \group_end: \vfill
%    \end{macrocode}
% 学位信息。
%    \begin{macrocode}
      \c_@@_cover_en_text_tl \@@_vskip:
      \textsc { \clist_item:Nn \c_@@_name_degree_en_clist
                  { \g_@@_info_degree_int } }
      \@@_vskip: { in } \@@_vskip: 
      \l_@@_info_major_en_tl \skip_vertical:n { 1 cm }
%    \end{macrocode}
% 校徽。
%    \begin{macrocode}
      \njuemblem [ black ] { ! } { 2.5 cm } \@@_vskip:
      \l_@@_info_dept_en_tl \\ \c_@@_name_nju_en_tl
      \skip_vertical:n { 1 cm }
%    \end{macrocode}
% 提交日期。
%    \begin{macrocode}
      \l_@@_info_sm_date_en_tl
  }
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\@@_cover_top_nl:}
% 国家图书馆封面顶部信息。
%    \begin{macrocode}
\cs_new_protected:Npn \@@_cover_top_nl:
  {
    \@@_spread_box:nnn { 3.2 em } { } { \c_@@_name_clc_tl   } \@@_hskip:
    \@@_ulined_center_box:nn { 9 em } { \l_@@_info_clc_tl   } \hfill
    \@@_spread_box:nnn { 3.2 em } { } { \c_@@_name_seclv_tl } \@@_hskip:
    \@@_ulined_center_box:nn { 9 em } { \l_@@_info_seclv_tl } \\
    \@@_spread_box:nnn { 3.2 em } { } { \c_@@_name_udc_tl   } \@@_hskip:
    \@@_ulined_center_box:nn { 9 em } { \l_@@_info_udc_tl   } \hfill \null
  }
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\@@_cover_title_nl:}
% 国家图书馆封面标题。
%    \begin{macrocode}
\cs_new_protected:Npn \@@_cover_title_nl:
  {
    \@@_split_title:n { \l_@@_info_title_tl }
    \noindent \kaishu \zihao { -0 } \skip_vertical:n { -1 cm }
    \@@_spread_box:nnn { 6 em } { } { \c_@@_name_title_tl }
    \@@_vskip: \zihao { 1 }
    \@@_multiline_box:nnnn { \l_@@_tmpa_int }
      \l_@@_tmpa_clist { 3 } { 15 em }
    \@@_vskip: \zihao{4} \c_@@_name_title_nl_tl
    \@@_vskip: \zihao{1} 
    \@@_ulined_center_box:nn { 4.5 em } { \l__nju_info_author_tl }
    \@@_vskip: \zihao{4} { ( } \c_@@_name_author_tl { ) }
  }
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\@@_cover_info_nl:}
% 国家图书馆封面信息栏。
%    \begin{macrocode}
\cs_new_protected:Npn \@@_cover_info_nl:
  {
    \@@_uline_entry:nnnn \l_@@_tmp_dim { supv_info } { supv } { } \\
    \@@_ulined_center_box:nn { \textwidth } 
      { \@@_info:n { supv_ttl } \@@_quad: \@@_info:n { supv_cont } } \\
    \@@_uline_bientry:nnnn \l_@@_tmp_dim { degree   } { degree  } { }
    \@@_uline_bientry:nnnn \l_@@_tmp_dim { major_nl } { major   } { } \\ 
    \@@_uline_bientry:nnnn \l_@@_tmp_dim { sm_date  } { sm_date } { }
    \@@_uline_bientry:nnnn \l_@@_tmp_dim { df_date  } { df_date } { } \\
    \@@_full_uline:Nn \l_@@_tmp_dim { \c_@@_name_confer_tl }
    \@@_uline:n { \l_@@_tmp_dim }
  }
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\@@_cover_bottom_nl:}
% 国家图书馆封面底部信息。
%    \begin{macrocode}
\cs_new_protected:Npn \@@_cover_bottom_nl:
  {
    \@@_name:n { chairman } \@@_hskip:
    \@@_ulined_center_box:nn { 9 em } { \@@_info:n { chairman } } \\
    \@@_name:n { reviewer } \@@_hskip:
    \@@_multiline_box:nnnn { \l_@@_tmpa_int }
      { \l_@@_info_reviewer_clist } { 4 } { 9 em }
  }
%    \end{macrocode}
% \end{macro}
%
%
% \subsubsection{绘制封面}
%
% \begin{macro}{\@@_make_cover_ug:}
% \changes{v0.13}{2021/12/10}{使用 \hologo{LaTeX3} 语法重构本科生封面。}
% 生成本科生封面。
%    \begin{macrocode}
\cs_new_protected:Npn \@@_make_cover_ug:
%    \end{macrocode}
% 校徽、校名。
%    \begin{macrocode}
    \null \skip_horizontal:n { -1 cm }
    \njuemblem [ black] { ! } { 3.35 cm }