%%
%% This is file `ctex-heading-book.def',
%% generated with the docstrip utility.
%%
%% The original source files were:
%%
%% ctex.dtx  (with options: `heading,book')
%% 
%%     Copyright (C) 2003--2022
%%     CTEX.ORG and any individual authors listed in the documentation.
%% ---------------------------------------------------------------------
%% 
%%     This work may be distributed and/or modified under the
%%     conditions of the LaTeX Project Public License, either
%%     version 1.3c of this license or (at your option) any later
%%     version. This version of this license is in
%%        http://www.latex-project.org/lppl/lppl-1-3c.txt
%%     and the latest version of this license is in
%%        http://www.latex-project.org/lppl.txt
%%     and version 1.3 or later is part of all distributions of
%%     LaTeX version 2005/12/01 or later.
%% 
%%     This work has the LPPL maintenance status "maintained".
%% 
%% ---------------------------------------------------------------------
%% 
\GetIdInfo$Id: ctex.dtx 13a2256 2022-07-14 18:54:09 +0800 Qing Lee <sobenlee@gmail.com> $
  {Heading modification for book (CTEX)}
\ProvidesExplFile{ctex-book.def}
  {\ExplFileDate}{2.5.10}{\ExplFileDescription}
\seq_const_from_clist:Nn \c__ctex_section_headings_seq
  { section , subsection , subsubsection , paragraph , subparagraph }
\seq_new:N \c__ctex_headings_seq
\seq_gset_eq:NN \c__ctex_headings_seq \c__ctex_section_headings_seq
\seq_gput_left:Nn \c__ctex_headings_seq { chapter }
\seq_gput_left:Nn \c__ctex_headings_seq { part }
\cs_new_protected:Npn \__ctex_initial_heading:n #1
  {
    \tl_new:c { CTEX@pre#1 }
    \tl_new:c { CTEX@post#1 }
    \tl_const:cx { CTEXthe#1 }
      {
        \exp_not:c { CTEX@pre#1 }
        \exp_not:c { CTEX@the#1 }
        \exp_not:c { CTEX@post#1 }
      }
    \tl_const:cx { CTEX@#1name }
      {
        \group_begin:
          \exp_not:c { CTEX@#1@nameformat }
            {
              \exp_not:c { CTEX@pre#1 }
              \exp_not:N \tl_if_empty:NTF
              \exp_not:c { CTEX@#1@numberformat }
                { \exp_not:c { CTEX@the#1 } }
                {
                  \group_begin:
                    \exp_not:c { CTEX@#1@numberformat }
                    \exp_not:c { CTEX@the#1 }
                  \group_end:
                }
              \exp_not:c { CTEX@post#1 }
            }
        \group_end:
      }
  }
\cs_new_protected:Npn \__ctex_def_heading_keys:n #1
  {
    \exp_args:NNe \tl_put_right:Nn \l__ctex_tmp_tl
      {
        #1                  .meta:nn = { ctex / #1 } { ##1 } ,
        #1 / name            .code:n =
          { \ctex_assign_heading_name:nn {#1} { ##1 } } ,
        #1 / number        .tl_set:N = \exp_not:c { CTEX@the#1 } ,
        #1 / beforeskip    .tl_set:N = \exp_not:c { CTEX@#1@beforeskip } ,
        #1 / afterskip     .tl_set:N = \exp_not:c { CTEX@#1@afterskip} ,
        #1 / indent        .tl_set:N = \exp_not:c { CTEX@#1@indent } ,
        #1 / numbering   .bool_set:N = \exp_not:c { CTEX@#1@numbering } ,
        #1 / numbering    .initial:n = true ,
        #1 / beforeskip   .initial:n = \c_zero_skip ,
        #1 / afterskip    .initial:n = \c_zero_skip ,
        #1 / indent       .initial:n = \c_zero_dim ,
        #1 / beforeskip   .value_required:n = true ,
        #1 / afterskip    .value_required:n = true ,
        #1 / indent       .value_required:n = true ,
        #1 / afterindent .bool_set:N = \exp_not:c { CTEX@#1@afterindent } ,
        #1 / fixskip     .bool_set:N = \exp_not:c { CTEX@#1@fixskip } ,
        #1 / hang        .bool_set:N = \exp_not:c { CTEX@#1@hang } ,
        #1 / hang         .initial:n = true ,
        #1 / runin       .bool_set:N = \exp_not:c { CTEX@#1@runin } ,
        #1 / tocline      .cs_set:Np = \exp_not:c { CTEX@#1@tocline } ##1##2 ,
        \__ctex_plus_key_aux:nn {#1} { break } ,
        \__ctex_plus_key_aux:nn {#1} { format } ,
        \__ctex_plus_key_aux:nn {#1} { nameformat } ,
        \__ctex_plus_key_aux:nn {#1} { numberformat } ,
        \__ctex_plus_key_aux:nn {#1} { titleformat } ,
        \__ctex_plus_key_aux:nn {#1} { aftername } ,
        \__ctex_plus_key_aux:nn {#1} { aftertitle } ,
      }
  }
\cs_new:Npn \__ctex_plus_key_aux:nn #1#2
  {
    #1 / #2   .tl_set:N = \exp_not:c { CTEX@#1@#2 } ,
    #1 / #2 +   .code:n =
      { \tl_put_right:Nn \exp_not:c { CTEX@#1@#2 } { ##1 } } ,
    #1 / #2 ~ + .code:n =
      { \tl_put_right:Nn \exp_not:c { CTEX@#1@#2 } { ##1 } }
  }
\NewDocumentCommand \ctex_assign_heading_name:nn
  { m > { \SplitArgument { 1 } { , } } +m }
  { \__ctex_assign_heading_name:nnn {#1} #2 }
\cs_new_protected:Npn \__ctex_assign_heading_name:nnn #1#2#3
  {
    \tl_set:cn { CTEX@pre#1 } {#2}
    \tl_if_novalue:nTF {#3}
      { \tl_clear:c { CTEX@post#1 } }
      { \tl_set:cn { CTEX@post#1 } {#3} }
  }
\group_begin:
\tl_set:Nn \l__ctex_tmp_tl
  {
    part    / pagestyle .tl_set:N = \CTEX@part@pagestyle ,
    chapter / pagestyle .tl_set:N = \CTEX@chapter@pagestyle ,
    chapter / lofskip   .tl_set:N = \CTEX@chapter@lofskip ,
    chapter / lotskip   .tl_set:N = \CTEX@chapter@lotskip ,
    chapter / lofskip  .initial:n = \c_zero_skip ,
    chapter / lotskip  .initial:n = \c_zero_skip ,
    chapter / lofskip  .value_required:n = true ,
    chapter / lotskip  .value_required:n = true ,
  }
\seq_map_inline:Nn \c__ctex_headings_seq
  {
    \__ctex_initial_heading:n {#1}
    \__ctex_def_heading_keys:n {#1}
  }
\exp_args:NNo \group_end: \ctex_define:n { \l__ctex_tmp_tl }
\cs_new_protected:Npn \CTEX@heading@format@initial
  {
    \normalfont
    \tl_clear:N \l__ctex_autoindent_tl
    \int_set:Nn \tex_interlinepenalty:D { 10 000 }
    \tex_noindent:D
  }
\cs_new_protected:Npn \ctex_indent_box:n #1
  {
    \dim_set:Nn \tex_parindent:D {#1}
    \__ctex_insert_indent:
  }
\cs_new_protected:Npn \__ctex_insert_indent:
  {
    \dim_compare:nNnF \tex_parindent:D = \c_zero_dim
      { \tex_indent:D }
  }
\cs_new_eq:NN \CTEX@indentbox \ctex_indent_box:n
\cs_new_protected:Npn \CTEX@fixtopskip
  {
    \CTEX@fixheadingskip
    \dim_compare:nNnF \tex_pagegoal:D < \c_max_dim
      { \skip_sub:Nn \l__ctex_heading_skip { \tex_topskip:D } }
  }
\cs_new_protected:Npn \CTEX@fixheadingskip
  {
    \par
    \dim_set:Nn \tex_prevdepth:D { -1000pt }
    \skip_sub:Nn \l__ctex_heading_skip { \tex_parskip:D }
  }
\skip_new:N \l__ctex_heading_skip
\cs_new_protected:Npn \CTEX@setheadingskip
  { \skip_set:Nn \l__ctex_heading_skip }
\cs_new_eq:NN \CTEX@headingskip \l__ctex_heading_skip
\cs_new_protected:Npn \CTEX@setthispagestyle #1
  { \exp_args:Ne \thispagestyle { \use:c { CTEX@#1@pagestyle } } }
\ProvideDocumentCommand \partmark { m }
  { \markboth { } { } }
\cs_new_eq:NN \CTEXifname \use_ii:nn
\cs_new_protected:Npn \CTEX@ifnametrue
  { \cs_set_eq:NN \CTEXifname \use_i:nn }
\cs_new_protected:Npn \CTEX@ifnamefalse
  { \cs_set_eq:NN \CTEXifname \use_ii:nn }
\cs_new_protected:Npn \CTEX@addloflotskip #1
  {
    \skip_set:Nn \l__ctex_heading_skip { \use:c { CTEX@#1@lofskip } }
    \skip_if_eq:nnF { \l__ctex_heading_skip } { \c_zero_skip }
      {
        \addtocontents { lof }
          { \protect \addvspace { \skip_use:N \l__ctex_heading_skip } }
      }
    \skip_set:Nn \l__ctex_heading_skip { \use:c { CTEX@#1@lotskip } }
    \skip_if_eq:nnF { \l__ctex_heading_skip } { \c_zero_skip }
      {
        \addtocontents { lot }
          { \protect \addvspace { \skip_use:N \l__ctex_heading_skip } }
      }
  }
\cs_new_protected:Npn \CTEX@addtocline #1#2
  { \addcontentsline { toc } {#1} { \use:c { CTEX@#1@tocline } {#1} {#2} } }
\renewcommand\part{%
  \CTEX@part@break
  \CTEX@setthispagestyle{part}%
  \if@twocolumn
    \onecolumn
    \@tempswatrue
  \else
    \@tempswafalse
  \fi
  \CTEX@setheadingskip \CTEX@part@beforeskip
  \ifodd \CTEX@part@fixskip \CTEX@fixtopskip \fi
  \vspace*{\CTEX@headingskip}%
  \secdef\@part\@spart}
\def\@part[#1]#2{%
  \ifnum \c@secnumdepth >-2\relax
    \ifodd \CTEX@part@numbering
      \CTEX@ifnametrue
      \refstepcounter{part}%
    \else
      \CTEX@ifnamefalse
      \CTEX@makeanchor{part*}%
    \fi
  \else
    \CTEX@ifnamefalse
    \CTEX@makeanchor{part*}%
  \fi
  \CTEX@gettitle{#1}%
  \CTEX@addtocline{part}{#1}%
  \partmark{#1}%
  \begingroup
    \CTEX@heading@format@initial
    \CTEX@part@format{%
      \CTEX@headinghang{part}%
        {\CTEXifname{\CTEX@partname\CTEX@part@aftername}{}}%
      \CTEX@part@titleformat{#2}%
      \CTEX@part@aftertitle}\par
  \endgroup
  \@endpart}
\def\@spart#1{%
  \CTEX@ifnamefalse
  \CTEX@makeanchor@spart{part*}%
  \CTEX@gettitle{#1}%
  \begingroup
    \CTEX@heading@format@initial
    \CTEX@part@format{%
      \CTEX@headinghang{part}{}%
      \CTEX@part@titleformat{#1}%
      \CTEX@part@aftertitle}\par
  \endgroup
  \@endpart}
\def\@endpart{%
  \CTEX@setheadingskip \CTEX@part@afterskip
  \ifodd \CTEX@part@fixskip \CTEX@fixheadingskip \fi
  \vskip \CTEX@headingskip
  \newpage
  \if@twoside
    \if@openright
      \null
      \thispagestyle{empty}%
      \newpage
    \fi
  \fi
  \if@tempswa
    \twocolumn
  \fi}
\renewcommand\chapter{%
  \CTEX@chapter@break
  \CTEX@setthispagestyle{chapter}%
  \global\@topnum\z@
  \ifodd \CTEX@chapter@afterindent
    \@afterindenttrue
  \else
    \@afterindentfalse
  \fi
  \secdef\@chapter\@schapter}
\def\@chapter[#1]#2{%
  \ifnum \c@secnumdepth >\m@ne
    \if@mainmatter
      \ifodd \CTEX@chapter@numbering
        \CTEX@ifnametrue
        \refstepcounter{chapter}%
        \typeout{\CTEXthechapter}%
      \else
        \CTEX@ifnamefalse
        \CTEX@makeanchor{\Hy@chapapp*}%
      \fi
    \else
      \CTEX@ifnamefalse
      \CTEX@makeanchor@chapter{\Hy@chapapp*}%
    \fi
  \else
    \CTEX@ifnamefalse
    \CTEX@makeanchor@chapter{\Hy@chapapp*}%
  \fi
  \CTEX@gettitle{#1}%
  \CTEX@addtocline{chapter}{#1}%
  \chaptermark{#1}%
  \CTEX@addloflotskip{chapter}%
  \if@twocolumn
    \@topnewpage[\@makechapterhead{#2}]%
  \else
    \@makechapterhead{#2}%
  \@afterheading
  \fi}
\def\@schapter#1{%
  \CTEX@ifnamefalse
  \CTEX@makeanchor@schapter{\Hy@chapapp*}%
  \CTEX@gettitle{#1}%
  \if@twocolumn
    \@topnewpage[\@makeschapterhead{#1}]%
  \else
    \@makeschapterhead{#1}%
    \@afterheading
  \fi}
\def\@makechapterhead#1{%
  \CTEX@setheadingskip \CTEX@chapter@beforeskip
  \ifodd \CTEX@chapter@fixskip \CTEX@fixtopskip \fi
  \vspace*{\CTEX@headingskip}%
  \begingroup
    \CTEX@heading@format@initial
    \CTEX@chapter@format{%
      \CTEX@headinghang{chapter}%
        {\CTEXifname{\CTEX@chaptername\CTEX@chapter@aftername}{}}%
      \CTEX@chapter@titleformat{#1}%
      \CTEX@chapter@aftertitle}\par
  \endgroup
  \nobreak
  \CTEX@setheadingskip \CTEX@chapter@afterskip
  \ifodd \CTEX@chapter@fixskip \CTEX@fixheadingskip \fi
  \vskip \CTEX@headingskip}
\def\@makeschapterhead#1{%
  \CTEX@setheadingskip \CTEX@chapter@beforeskip
  \ifodd \CTEX@chapter@fixskip \CTEX@fixtopskip \fi
  \vspace*{\CTEX@headingskip}%
  \begingroup
    \CTEX@heading@format@initial
    \CTEX@chapter@format{%
      \CTEX@headinghang{chapter}{}%
      \CTEX@chapter@titleformat{#1}%
      \CTEX@chapter@aftertitle}\par
  \endgroup
  \nobreak
  \CTEX@setheadingskip \CTEX@chapter@afterskip
  \ifodd \CTEX@chapter@fixskip \CTEX@fixheadingskip \fi
  \vskip \CTEX@headingskip}
\def\@startsection#1#2#3#4#5#6{%
  \if@noskipsec \leavevmode \fi
  \par
  \CTEX@update@sectionformat@n{#1}%
  \ifodd \CTEX@afterindent
    \@afterindenttrue
  \else
    \@afterindentfalse
  \fi
  \if@nobreak
    \everypar{}%
  \else
    \csname CTEX@#1@break\endcsname
    \CTEX@setheadingskip{#4}%
    \ifodd \CTEX@fixskip \CTEX@fixheadingskip \fi
    \addvspace \CTEX@headingskip
  \fi
  \@ifstar
    {\CTEX@makeanchor@ssect{#1*}\@ssect{#3}{#4}{#5}{#6}}%
    {\@dblarg{\@sect{#1}{#2}{#3}{#4}{#5}{#6}}}}
\def\@seccntformat#1{%
  \csname CTEX@#1name\endcsname
  \csname CTEX@#1@aftername\endcsname}
\def\@sect#1#2#3#4#5#6[#7]#8{%
  \ifnum #2>\c@secnumdepth
    \CTEX@ifnamefalse
    \CTEX@makeanchor@sect{#1*}%
    \let\@svsec\@empty
  \else
    \ifodd \csname CTEX@#1@numbering\endcsname
      \CTEX@ifnametrue
      \refstepcounter{#1}%
      \protected@edef\@svsec{\@seccntformat{#1}\relax}%
    \else
      \CTEX@ifnamefalse
      \CTEX@makeanchor{#1*}%
      \let\@svsec\@empty
    \fi
  \fi
  \CTEX@gettitle{#7}%
  \unless \ifodd \CTEX@runin
    \begingroup
      \CTEX@heading@format@initial
      #6{%
        \CTEX@sectionhang{#3}{\@svsec}%
        \csname CTEX@#1@titleformat\endcsname{#8}%
        \csname CTEX@#1@aftertitle\endcsname}\par
    \endgroup
    \csname #1mark\endcsname{#7}%
    \CTEX@addtocline{#1}{#7}%
  \else
    \def\@svsechd{%
      #6{%
        {\CTEX@indentbox{#3}}\@svsec
        \csname CTEX@#1@titleformat\endcsname{#8}%
        \csname CTEX@#1@aftertitle\endcsname}%
      \csname #1mark\endcsname{#7}%
      \CTEX@addtocline{#1}{#7}}%
  \fi
  \@xsect{#5}}
\def\@ssect#1#2#3#4#5{%
  \CTEX@ifnamefalse
  \CTEX@gettitle{#5}%
  \unless \ifodd \CTEX@runin
    \begingroup
      \CTEX@heading@format@initial
      #4{%
        \CTEX@sectionhang{#1}{}%
          \CTEX@titleformat@n{#5}%
          \CTEX@aftertitle}\par
    \endgroup
  \else
    \def\@svsechd{#4{{\CTEX@indentbox{#1}}%
      \CTEX@titleformat@n{#5}\CTEX@aftertitle}}%
  \fi
  \@xsect{#3}}
\def\@xsect#1{%
  \unless \ifodd \CTEX@runin
    \par \nobreak
    \CTEX@setheadingskip{#1}%
    \ifodd \CTEX@fixskip \CTEX@fixheadingskip \fi
    \vskip \CTEX@headingskip
    \@afterheading
  \else
    \@nobreakfalse
    \global\@noskipsectrue
    \everypar{%
      \if@noskipsec
        \global\@noskipsecfalse
       {\setbox\z@\lastbox}%
        \clubpenalty\@M
        \begingroup \@svsechd \endgroup
        \unskip
        \CTEX@heading@glue{#1}%
      \else
        \clubpenalty \@clubpenalty
        \everypar{}%
      \fi}%
  \fi
  \ignorespaces}
\cs_new_protected:Npn \CTEX@headinghang #1
  {
    \ctex_heading_hang:cnn
      { CTEX@#1@hang }
      { \use:c { CTEX@#1@indent } }
  }
\cs_new_protected:Npn \CTEX@sectionhang
  { \ctex_heading_hang:Nnn \CTEX@hang }
\cs_new_protected:Npn \ctex_heading_hang:Nnn #1#2#3
  {
    \dim_set:Nn \tex_parindent:D {#2}
    \bool_if:NTF #1
      { \ctex_hang_from:n }
      { \use:n }
      { \__ctex_insert_indent: #3 }
  }
\cs_new_protected:Npn \ctex_hang_from:n #1
  {
    \tex_noindent:D
    \hbox_set:Nn \l__ctex_tmp_box {#1}
    \tex_hangindent:D = \box_wd:N \l__ctex_tmp_box
    \box_use_drop:N \l__ctex_tmp_box
  }
\cs_generate_variant:Nn \ctex_heading_hang:Nnn { c }
\cs_new_protected:Npn \ctex_heading_glue:n #1
  {
    \group_begin:
      \skip_set:Nn \l__ctex_heading_skip {#1}
      \dim_compare:nNnF \l__ctex_heading_skip = \c_zero_dim
        { \skip_horizontal:N \l__ctex_heading_skip }
    \group_end:
  }
\cs_new_eq:NN \CTEX@heading@glue \ctex_heading_glue:n
\cs_new_protected:Npn \CTEX@update@sectionformat@n #1
  {
    \cs_set_eq:Nc \CTEX@titleformat@n { CTEX@#1@titleformat }
    \cs_set_eq:Nc \CTEX@aftertitle    { CTEX@#1@aftertitle }
    \cs_set_eq:Nc \CTEX@afterindent   { CTEX@#1@afterindent }
    \cs_set_eq:Nc \CTEX@fixskip       { CTEX@#1@fixskip }
    \cs_set_eq:Nc \CTEX@hang          { CTEX@#1@hang }
    \cs_set_eq:Nc \CTEX@runin         { CTEX@#1@runin }
  }
\cs_new_eq:NN \CTEX@titleformat@n \use:n
\cs_new_eq:NN \CTEX@aftertitle \prg_do_nothing:
\cs_new_eq:NN \CTEX@afterindent \c_true_bool
\cs_new_eq:NN \CTEX@fixskip \c_false_bool
\cs_new_eq:NN \CTEX@hang \c_true_bool
\cs_new_eq:NN \CTEX@runin \c_false_bool
\cs_new:Npn \CTEX@part@tocline #1#2
  {
    \CTEXifname
      { \CTEXthepart \hspace { 1em } }
      { }
    #2
  }
\cs_new:Npn \CTEX@chapter@tocline #1#2
  {
    \CTEXifname
      { \protect \numberline { \CTEXthechapter \hspace { .3em } } }
      { }
    #2
  }
\cs_new:Npn \CTEXnumberline #1
  {
    \CTEXifname
      { \protect \numberline { \use:c { CTEXthe #1 } } }
      { }
  }
\int_zero:N \l__ctex_tmp_int
\seq_map_inline:Nn \c__ctex_section_headings_seq
  {
    \int_incr:N \l__ctex_tmp_int
    \cs_gset_protected:cpx  {#1}
      {
        \exp_not:N \@startsection {#1}
          { \int_use:N \l__ctex_tmp_int }
          { \exp_not:c { CTEX@#1@indent } }
          { \exp_not:c { CTEX@#1@beforeskip } }
          { \exp_not:c { CTEX@#1@afterskip } }
          { \exp_not:N \normalfont \exp_not:c { CTEX@#1@format } }
      }
    \cs_new:cpn { CTEX@#1@tocline } ##1##2
      { \CTEXnumberline { ##1 } ##2 }
  }
\ctex_define:n
  {
    appendix                .meta:nn = { ctex / appendix } {#1} ,
    appendix / name          .code:n =
      { \ctex_assign_heading_name:nn { appendix } {#1} } ,
    appendix / number      .tl_set:N = \CTEX@appendix@number ,
    appendix / numbering .bool_set:N = \CTEX@appendix@numbering ,
    appendix / numbering  .initial:n = true
  }
\tl_new:N \CTEX@preappendix
\tl_new:N \CTEX@postappendix
\cs_new_eq:NN \CTEX@save@appendix \appendix
\cs_gset_protected:Npn \appendix
  {
    \CTEX@save@appendix
    \gdef \CTEX@prechapter { \CTEX@preappendix }
    \gdef \CTEX@thechapter { \CTEX@appendix@number }
    \gdef \CTEX@postchapter { \CTEX@postappendix }
    \gdef \CTEX@chapter@numbering { \CTEX@appendix@numbering }
  }
\cs_new_protected:Npn \CTEX@makeanchor #1
  { }
\seq_const_from_clist:Nn \c__ctex_headings_cs_seq
  { part , spart , chapter , schapter , sect , ssect }
\seq_map_inline:Nn \c__ctex_headings_cs_seq
  {
    \cs_new_eq:cc { CTEX@ #1 } { @ #1 }
    \cs_new_eq:cN { CTEX@makeanchor@ #1 } \CTEX@makeanchor
  }
\cs_new_protected:Npn \CTEX@hyperheadinghook
  {
    \group_begin:
      \legacy_if:nTF { Hy@implicit }
        {
          \cs_set_eq:NN \H@old@chapter \Hy@org@chapter
          \seq_map_inline:Nn \c__ctex_headings_cs_seq
            {
              \cs_if_eq:ccT { H@old@ ##1 } { CTEX@ ##1 }
                {
                  \cs_gset_eq:cc { @ ##1 } { CTEX@ ##1 }
                  \cs_gset_eq:cN { CTEX@makeanchor@ ##1 } \CTEX@makeanchor
                }
            }
        }
        {
          \seq_map_inline:Nn \c__ctex_headings_cs_seq
            { \cs_gset_eq:cN { CTEX@makeanchor@ ##1 } \CTEX@makeanchor }
        }
    \group_end:
  }
\ctex_at_end_package:nn { hyperref }
  {
    \cs_gset_protected:Npn \CTEX@makeanchor #1
      {
        \Hy@MakeCurrentHrefAuto {#1}
        \Hy@raisedlink
          {
            \hyper@anchorstart { \@currentHref }
            \hyper@anchorend
          }
      }
    \CTEX@hyperheadinghook
  }
\cs_new_protected:Npn \CTEX@gettitle #1
  { }
\ctex_at_end_package:nn { nameref }
  {
    \cs_gset_protected:Npn \CTEX@gettitle { \NR@gettitle }
    \seq_map_inline:Nn \c__ctex_headings_cs_seq
      {
        \cs_if_eq:ccT { NR@ #1 } { CTEX@ #1 }
          { \cs_gset_eq:cc { @ #1 } { CTEX@ #1 } }
      }
  }
\cs_new_protected:Npn \ctex_titlesec_hook:
  {
    \@ifpackagewith { titlesec } { explicit }
      {
        \cs_set_eq:NN \__ctex_titlesec_format:Nn
                      \__ctex_titlesec_format_explicit:Nn
      }
      { }
    \clist_map_inline:nn
      { indentafter , noindentafter , indentfirst , nonindentfirst }
      {
        \@ifpackagewith { titlesec } { ##1 }
          {
            \clist_map_break:n
              { \cs_set_eq:NN \__ctex_titlesec_hook:n \__ctex_titlesec_format:n }
          }
          { }
      }
    \seq_map_function:NN \c__ctex_section_headings_seq \__ctex_titlesec_hook:n
  }
\cs_new_protected:Npn \__ctex_titlesec_hook:n #1
  {
    \__ctex_titlesec_format:n {#1}
    \exp_args:Nc \__ctex_titlesec_spacing:Nn { ttls@#1 } {#1}
  }
\cs_new_protected:Npn \__ctex_titlesec_format:n #1
  {
    \cs_if_free:cF { ttlf@#1 }
      { \exp_args:Nc \__ctex_titlesec_format:Nn { ttlf@#1 } {#1} }
  }
\cs_new_protected:Npn \__ctex_titlesec_format:Nn #1#2
  {
    \tl_set:Nx #1
      {
        \bool_if:cTF { CTEX@#2@runin }
          { \exp_not:N \ttlh@runin }
          { \exp_not:N \ttlh@hang }
        \tl_tail:N #1
      }
  }
\cs_new_protected:Npn \__ctex_titlesec_format_explicit:Nn #1#2
  {
    \cs_set_nopar:Npx #1 ##1
      {
        \bool_if:cTF { CTEX@#2@runin }
          { \exp_not:N \ttlh@runin }
          { \exp_not:N \ttlh@hang }
        \exp_args:No \tl_tail:n { #1 { } }
      }
  }
\cs_new_protected:Npn \__ctex_titlesec_spacing:Nn #1#2
  { \tl_set:Nx #1 { \exp_after:wN \__ctex_titlesec_spacing:nnnnnn #1 {#2} } }
\cs_new:Npn \__ctex_titlesec_spacing:nnnnnn #1#2#3#4#5#6
  {
    \exp_not:n { {#1} {#2} {#3} {#4} }
    { \bool_if:cTF { CTEX@#6@afterindent } { \@ne } { \z@ } }
  }
\@ifpackageloaded { titlesec }
  { }
  {
    \ctex_at_end_package:nn { titlesec }
      {
        \@ifpackagewith { titlesec } { loadonly }
          { }
          { \ctex_titlesec_hook: }
      }
  }
\ctex_at_end_package:nn { titlesec }
  {
    \tl_set:Nn \ttl@chapterout { \typeout { \CTEXthechapter } }
    \cs_if_free:NF \ttl@tocpart
      {
        \cs_set_protected:Npn \ttl@tocpart
          { \tl_set:Nn \ttl@a { \CTEXthepart \hspace { 1em } } }
      }
    \seq_map_inline:Nn \c__ctex_headings_seq
      {
        \cs_if_exist:cF { ttl@toc #1 }
          {
            \cs_new_protected:cpx { ttl@toc #1 }
              {
                \tl_set:Nn \exp_not:N \ttl@a
                  {
                    \exp_not:N \protect
                    \exp_not:N \numberline { \exp_not:c { CTEXthe #1 } }
                  }
              }
          }
      }
  }
\ctex_at_end_package:nn { titlesec }
  {
    \ctex_patch_cmd:Nnn \ttl@labelling
      { \let \ifttl@toclabel \ifttl@label }
      {
        \let \ifttl@toclabel \ifttl@label
        \CTEX@updatettlifname
      }
    \cs_new_protected:Npn \CTEX@updatettlifname
      { \legacy_if:nTF { ttl@label } { \CTEX@ifnametrue } { \CTEX@ifnamefalse } }
  }
\group_begin:
\char_set_catcode_other:N \#
\cs_new_protected:Npn \ctex_titleps_hook:
  {
    \ctex_patch_cmd:Nnn \ttl@settopmark
      { \protect \@namedef { the#1 } { \@nameuse { the#1 } } }
      {
        \protect \@namedef { the#1 } { \@nameuse { the#1 } }
        \CTEX@titlepslabel@set {#1}
      }
    \ctex_patch_cmd:Nnn \ttl@setsubmark
      { \protect \@namedef { the#1 } { } }
      {
        \protect \@namedef { the#1 } { }
        \CTEX@titlepslabel@clear {#1}
      }
    \ctex_patch_cmd:Nnn \ttl@setsubmark
      { \protect \@namedef { the#2 } { \@nameuse { the#2 } } }
      {
        \protect \@namedef { the#2 } { \@nameuse { the#2 } }
        \CTEX@titlepslabel@set {#2}
      }
  }
\group_end:
\cs_new:Npn \CTEX@titlepslabel@set #1
  {
    \cs_if_free:cF { CTEXthe#1 }
      { \protect \@namedef { CTEXthe#1 } { \@nameuse { CTEXthe#1 } } }
  }
\cs_new:Npn \CTEX@titlepslabel@clear #1
  {
    \cs_if_free:cF { CTEXthe#1 }
      { \protect \@namedef { CTEXthe#1 } { } }
  }
\ctex_at_end_package:nn { titlesec }
  { \cs_if_free:NF \ttl@settopmark { \ctex_titleps_hook: } }
\ctex_at_end_package:nn { titleps } { \ctex_titleps_hook: }
\ctex_at_end_package:nn { titleps }
  {
    \cs_set_protected:Npn \ttl@setifthe #1
      {
        \exp_args:Nco \cs_set:Npn { ifthe #1 }
          {
            \CTEXifname
              { \protect \@firstoftwo }
              { \protect \@secondoftwo }
          }
      }
    \seq_map_function:NN \c__ctex_headings_seq \ttl@setifthe
  }
\cs_new_protected:Npn \CTEX@toc@width@n #1
  {
    \hbox_set:Nn \l__ctex_tmp_box {#1}
    \dim_set:Nn \@tempdima
      {
        \dim_max:nn { \@tempdima }
          { \box_wd:N \l__ctex_tmp_box + \f@size \p@ / 2 }
      }
  }
\group_begin:
\char_set_catcode_other:N \#
\use:n
  {
    \group_end:
    \ctex_preto_cmd:NnnTF \numberline { \ExplSyntaxOff }
      { \CTEX@toc@width@n {#1} }
      { }
      { \ctex_patch_failure:N \numberline }
    \cs_new_protected:Npn \__ctex_patch_toc_width:n \c_parameter_token 1
      {
        \@ifpackageloaded { \c_parameter_token 1 }
          { }
          {
            \ctex_at_end_package:nn { \c_parameter_token 1 }
              {
                \ctex_preto_cmd:NnnTF \numberline
                  { \char_set_catcode_letter:n { 64 } }
                  { \CTEX@toc@width@n {#1} }
                  { }
                  { \ctex_patch_failure:N \numberline }
              }
          }
      }
  }
\__ctex_patch_toc_width:n { tocloft  }
\__ctex_patch_toc_width:n { titletoc }
\ctex_patch_cmd:Nnn \ps@headings
  {
    \ifnum \c@secnumdepth > \m@ne \if@mainmatter
      \@chapapp \ \thechapter . ~ \ %
    \fi \fi
  }
  { \CTEXifname { \CTEXthechapter \quad } { } }
\legacy_if:nT { @twoside }
  {
    \ctex_patch_cmd:Nnn \ps@headings
      { \ifnum \c@secnumdepth > \z@ \thesection . ~ \ \fi }
      { \CTEXifname { \CTEXthesection \quad } { } }
  }
\ctex_at_end_package:nn { fancyhdr }
  {
    \ctex_patch_cmd:Nnn \f@nch@initialise
      { \ifnum \c@secnumdepth > \z@ \thesection \hskip 1em \relax \fi }
      { \CTEXifname { \CTEXthesection \quad } { } }
    \ctex_patch_cmd:Nnn \f@nch@initialise
      { \ifnum \c@secnumdepth > \@ne \thesubsection \hskip 1em \relax \fi }
      { \CTEXifname { \CTEXthesubsection \quad } { } }
    \ctex_patch_cmd:Nnn \f@nch@initialise
      { \ifnum \c@secnumdepth > \m@ne \@chapapp\ \thechapter . ~ \ \fi }
      { \CTEXifname { \CTEXthechapter \quad } { } }
    \ctex_patch_cmd:Nnn \f@nch@initialise
      { \ifnum \c@secnumdepth > \z@ \thesection . ~ \ \fi }
      { \CTEXifname { \CTEXthesection \quad } { } }
    \f@nch@initialise
    \@ifpackagewith { fancyhdr } { headings }
      {
        \ctex_patch_cmd:Nnn \ps@headings
          {
            \ifnum \c@secnumdepth > \m@ne \if@mainmatter
              \@chapapp \ \thechapter . ~ \ %
            \fi \fi
          }
          { \CTEXifname { \CTEXthechapter \quad } { } }
        \legacy_if:nT { @twoside }
          {
            \ctex_patch_cmd:Nnn \ps@headings
              { \ifnum \c@secnumdepth > \z@ \thesection . ~ \ \fi }
              { \CTEXifname { \CTEXthesection \quad } { } }
          }
      }
      { }
  }
\ctex_define:n
  {
    secnumdepth           .code:n = \ctex_heading_depth:ne { secnumdepth } {#1} ,
    secnumdepth .value_required:n = true ,
    tocdepth              .code:n = \ctex_heading_depth:ne { tocdepth } {#1} ,
    tocdepth    .value_required:n = true
  }
\cs_new_protected:Npn \ctex_heading_depth:nn #1#2
  {
    \prop_get:NnNTF \c__ctex_heading_level_prop {#2} \l__ctex_tmp_tl
      { \setcounter {#1} { \l__ctex_tmp_tl } }
      { \setcounter {#1} { \int_eval:n {#2} } }
  }
\cs_generate_variant:Nn \ctex_heading_depth:nn { ne }
\prop_const_from_keyval:Nn \c__ctex_heading_level_prop
  {
    part          = -1 ,
    chapter       =  0 ,
    section       =  1 ,
    subsection    =  2 ,
    subsubsection =  3 ,
    paragraph     =  4 ,
    subparagraph  =  5
  }
\cs_new_protected:Npn \CTEX@setcurrentlabel@n #1
  {
    \protected@edef \@currentlabel
      {
        \cs_if_exist:cTF { CTEX@the#1 }
          { \exp_args:cc { p@#1 } { CTEX@the#1 } }
          { \exp_not:o { \@currentlabel } }
      }
  }
\cs_new_protected:Npn \ctex_varioref_hook:
  {
    \seq_map_inline:Nn \c__ctex_headings_seq
      { \ctex_fix_varioref_label:n { ##1 } }
    \ctex_at_end_package:nn { cleveref } { \ctex_cleveref_hook: }
  }
\cs_new_protected:Npn \ctex_fix_varioref_label:n #1
  {
    \tl_if_empty:cT { p@#1 }
      { \exp_args:Nnx \labelformat {#1} { \exp_not:c { CTEX@the#1 } } }
  }
\cs_new_protected:Npn \ctex_cleveref_hook:
  {
    \@ifpackageloaded { hyperref }
      {
        \@ifpackagewith { hyperref } { implicit = false }
          { }
          { \__ctex_cleveref_hook_aux:N \H@refstepcounter }
      }
      {
        \__ctex_cleveref_hook_aux:N \refstepcounter@noarg
        \__ctex_cleveref_hook_aux:N \refstepcounter@optarg
      }
    \__ctex_cleveref_hook_aux:N \appendix
  }
\cs_new_protected:Npn \__ctex_cleveref_hook_aux:N #1
  {
    \ctex_patch_cmd_all:NnnnTF #1
      {
        \ExplSyntaxOff
        \char_set_catcode_letter:n { 64 }
      }
      { \endcsname \csname the }
      { \expandafter \endcsname \csname the }
      { }
      { \ctex_patch_failure:N #1 }
  }
\cs_if_exist:NTF \labelformat
  { \ctex_varioref_hook: }
  {
    \cs_new_eq:NN \CTEX@save@refstepcounter \refstepcounter
    \RenewDocumentCommand \refstepcounter { m }
      {
        \CTEX@save@refstepcounter {#1}
        \CTEX@setcurrentlabel@n {#1}
      }
    \ctex_at_end_package:nn { varioref } { \ctex_varioref_hook: }
  }
\ctex_scheme_input:o { \l__ctex_scheme_tl }
%% 
%%
%% End of file `ctex-heading-book.def'.
