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titlesec.sty
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titlesec.sty
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%
% Copyright (C) 1998-2025 Javier Bezos http://www.texnia.com
%
% This file may be distributed and/or modified under the conditions of
% the MIT License. A version can be found at the end of this file.
%
% Repository: https://github.com/jbezos/titlesec
%
% Notes
% ~~~~~
%
% The following tags are used:
% ttl@ : the generic tag used through the style
% ttlh@ : a shape definition
% ttlf@ : a macro containing the title format
% ttls@ : id. the title space
% ttlp@ : page key related macros
% ttll@ : level number
%
% The ttlf@ and ttls@ contains data in the form {..}{..}.
% Perhaps in future releases they should be converted
% to a prop-like list, similar to that proposed by the
% latex team.
%
% Admittedly, the current implementation seems too
% complicated, but that's necessary in order to provide
% certain compatibility with the sections as defined by the
% used class. Other packages opt for providing the sections
% as defined by standard classes ignoring the class; for
% instance sectsty which does a simple task in a simple and
% nice way. However, that was not my goal.
%
% Release
% ~~~~~~~
\NeedsTeXFormat{LaTeX2e}
\ProvidesPackage{titlesec}[2025/01/04 v2.17 Sectioning titles]
% Initialization
% ~~~~~~~~~~~~~~
\newif\ifttl@ps
\ttl@psfalse
% The \ttl@label switch is used when printing the label in titles.
% A numberless variant makes it to true.
% There is a \ttl@toclabel as well, which is true iff the
% title is numbered; used in toc entries (except default part
% and chapter) and marks (only in titlesec pagestyles).
\newif\ifttl@label
\newif\ifttl@toclabel
\newbox\ttl@box
% A provision for the report style:
\@ifundefined{if@mainmatter}
{\let\if@mainmatter\iftrue}{}
\@ifundefined{if@openright}
{\let\if@openright\iftrue}{}
% and the ams styles as well
\@ifundefined{@chapapp}
{\let\@chapapp\chaptername}{}
\def\ttl@trylist{\ttl@try{}}
\def\ttl@getkeys#1#2{%
\if\expandafter @\@gobble#1@\@empty
\edef\ttl@b{\expandafter\@gobble\string#1}%
\let\ttl@a\ttl@b
\else
\ttl@keys
\ttl@getkeys{#1}{#2}%
\fi}
% A more meaningful error for \@notdefinable
\expandafter\AtEndOfPackage\expandafter{\expandafter
\gdef\expandafter\@notdefinable\expandafter{\@notdefinable}}
\def\@notdefinable{%
\PackageError{titlesec}%
{Incompatible package}%
{Titlesec cannot continue defining its own macros
because\MessageBreak
\@backslashchar\reserved@a\space is already used by other package,
the class\MessageBreak
or the document.}}
% +-----------------+
% | C L A S S E S |
% +-----------------+
\def\ttl@useclass#1#2{%
\@ifstar
{\ttl@labelfalse#1{#2}[]}%
{\ttl@labeltrue\@dblarg{#1{#2}}}}
\def\ttl@straightclass{\ttl@useclass\ttl@straight@i}
\def\ttl@partclass{\ttl@useclass\ttl@part@i}
\def\ttl@topclass{\ttl@useclass\ttl@top@i}
\def\ttl@pageclass{\ttl@useclass\ttl@page@i}
% Here \scantokens is used to make sure the unescaped name
% has `letters' and no `others'. Mainly for hyperref, so there
% should be no problems.
\newcommand\titleclass[1]{%
\edef\ttl@a{\expandafter\@gobble\string#1}%
\ifx\scantokens\@undefined\else
\scantokens\expandafter{\expandafter
\def\expandafter\ttl@a\expandafter{\ttl@a}}%
\fi
\@ifnextchar[{\@tempswatrue\ttl@class@i{#1}}%
{\@tempswafalse\ttl@class@ii{#1}}}
\def\ttl@class@i#1[#2]{%
\@namedef{ttll@\ttl@a}{#2}%
\expandafter\providecommand\csname\ttl@a title\endcsname{}%%%%
\@ifundefined{ttl@toplevel}{}%
{\expandafter\let\csname ttlss@\ttl@a\expandafter\endcsname
\csname ttlss@\ttl@toplevel\endcsname}%
\edef\ttl@toplevel{\ttl@a}%
\ttl@class@ii{#1}}
\def\ttl@class@ii#1#2{%
\@ifundefined{ttl@#2class}%
{\PackageError{titlesec}{Unknown sectioning class}%
{Valid names are top, page and straight}}%
{\expandafter\let\csname ttl@compat\ttl@a\endcsname\relax
\@ifundefined{\ttl@a mark}%
{\@namedef{\ttl@a mark}{\@gobble}}%
{}%
\edef#1{%
\expandafter\noexpand\csname ttl@#2class\endcsname{\ttl@a}}}%
\if@tempswa
\expandafter\@gobble
\else
\expandafter\@firstofone
\fi
{\@ifnextchar[%
{\ttl@class@iii}%
{\@ifundefined{ttll@\ttl@a}%
{\PackageError{titlesec}{Unknown sectioning level}%
{\string\titleclass\space with no optional arguments\MessageBreak
only changes the class of an *existing* level}}}}}
\def\ttl@class@iii[#1]{%
\edef\ttl@b{\expandafter\@gobble\string#1}%
\expandafter\let\csname ttlss@\ttl@a\expandafter\endcsname
\csname ttlss@\ttl@b\endcsname
\expandafter\edef\csname ttlss@\ttl@b\endcsname{\ttl@a}%
\let\ttl@a\ttl@toplevel
\count@\csname ttll@\ttl@toplevel\endcsname
\ttl@class@iv}
\def\ttl@class@iv{%
\@ifundefined{ttlss@\ttl@a}{}%
{\advance\count@\@ne
\edef\ttl@a{\csname ttlss@\ttl@a\endcsname}%
\expandafter\edef\csname ttll@\ttl@a\endcsname{\the\count@}%
\ttl@class@iv}}
% Typesetting Classes: General tools
% ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
% The following command handles the *n spacing
% Some tricks are necessary to multiply a
% skip by a non integer number
\newskip\beforetitleunit
\beforetitleunit=1ex\@plus.3ex\@minus.06ex
\newskip\aftertitleunit
\aftertitleunit=1ex\@plus.1ex
\newdimen\ttl@plus
\newdimen\ttl@minus
\def\ttl@assign#1{%
\@ifstar
{\ttl@assign@i{#1}}%
{\ttl@assign@d{#1}}}
\def\ttl@assign@i#1#2\relax#3{%
\ttl@plus\z@
\ttl@minus\z@
\afterassignment\ttl@assign@ii
\dimen@\the#3, % <- space
#1 = #2\dimen@
plus #2\ttl@plus
minus #2\ttl@minus}
\def\ttl@assign@ii#1 {% <- space
\if#1,\else\afterassignment\ttl@assign@ii\fi
\csname ttl@\string#1\endcsname}
\def\ttl@assign@d#1#2\relax#3{\setlength#1{#2}}
% To be used with \v/vspace to make them calc-savvy
\def\ttl@calc#1#2{%
{\setlength\@tempskipa{#2}%
#1\@tempskipa}}
\def\ttl@calcneg#1#2{%
{\setlength\@tempskipa{#2}%
#1{-\@tempskipa}}}
% Gets from ttls@ and passes the spacing parameters:
\def\ttl@startargs#1#2{% Get the first arguments, with the spacing
\@ifundefined{ttlp@#2}%
{\let\ttl@key@page\@empty}%
{\ttlp@fetch{#2}}%
\begingroup
\def\ttl@b{ttls@#2}%
\edef\ttl@key@numberless{\ifttl@label//\else/*\fi}%
\def\ttl@a##1{\csname ttl@key@##1\endcsname}% Used as elt in try
\ttl@trylist
\xdef\ttl@b{\ttl@c}%
\endgroup
\ifx\ttl@b\@empty
\PackageError{titlesec}{Format/spacing not found}%
{I was unable to find the format corresponding to #2.\MessageBreak
Maybe you haven't set it with \string\titleformat\space and
\string\titlespacing}
\fi
\expandafter#1\ttl@b{#2}}
% Used in ttl@select
\def\ttl@savefn#1[#2]#3{%
\ifcase#1%
\footnotemark[#2]%
\gdef\ttl@fn{\footnotetext[#2]{#3}}%
\else
\footnotemark
\gdef\ttl@fn{\footnotetext{#3}}%
\fi}
\def\ttl@nest@error{%
\PackageError{titlesec}{Nested titles}{Titles must not be nested}}
\def\ttl@hmode@error{%
\PackageError{titlesec}{Entered in horizontal mode}
{The <format> argument cannot contain horizontal material\MessageBreak
such as text, \string\noindent, \string\makebox, etc.}}
% \ttl@select not only selects the right version to be
% used. It also take steps to ensure that a mark
% is not lost inside a box by saving it into \ttl@mk,
% which in turn is used by the sect and chap commands.
% As of 2019 and due the LaTex
% kernel modifies \markboth, we consider two possibilities (2.13).
\newif\ifttl@explicit
\def\ttl@gmk#1{\gdef\ttl@mk{#1}}
\def\ttl@select#1#2#3#4{%
\ttl@Hy@saveanchor
\global\let\ttl@mk\@empty % global because of rigidchapters
\global\let\ttl@fn\@empty
\begingroup
\if@inlabel\else % Keep item's \everypar
\everypar{\setbox\z@\lastbox\ttl@strut}%
\fi
\let\ttl@straight@i\ttl@nest@error
\let\ttl@top@i \ttl@nest@error
\let\ttl@part@i \ttl@nest@error
\let\ttl@page@i \ttl@nest@error
\let\ttl@newpage\newpage
\def\newpage{\ttl@savewrite\ttl@newpage}%
\expandafter\ifx\csname markboth \endcsname\relax
\def\markboth##1##2{\protect\ttl@gmk{\protect\markboth{##1}{##2}}}%
\def\markright##1{\protect\ttl@gmk{\protect\markright{##1}}}%
\else
\@namedef{markboth }##1##2{\protect\ttl@gmk{\markboth{##1}{##2}}}%
\@namedef{markright }##1{\protect\ttl@gmk{\markright{##1}}}%
\fi
\def\@mkboth##1##2{\protect\ttl@gmk{\protect\@mkboth{##1}{##2}}}%
\protected\def\footnote{\@ifnextchar[%
{\ttl@savefn\z@}{\ttl@savefn\@ne[]}}%
\edef\ttl@key@numberless{\ifttl@label//\else/*\fi}%
\def\ttl@b{ttlf@#1}%
\def\ttl@a##1{\csname ttl@key@##1\endcsname}% Used as elt in try
\ttl@trylist
\ifx\ttl@c\@empty
\PackageError{titlesec}{No format for this command}%
{If you (re)set the class of a sectioning command, you may\MessageBreak
you may need to (re)define its format with \string\titleformat}%
\fi
\ifttl@explicit
\def\ttl@passexplicit{\ttl@case{#4}}%
\ttl@c{#4}{#2}{#3}{}% ttl@c is returned by ttl@try with ttlf@...
\else
\let\ttl@passexplicit\ttl@case
\ttl@c{#2}{#3}{#4}% ttl@c is returned by ttl@try with ttlf@...
\fi
\endgroup}
\let\ttl@savewrite\@empty
\def\ttl@finmarks{%
\ttl@savewrite
\ttl@mk % Contains a possible mark, returned by \ttl@select
\ttl@fn} % And a footnote
\def\ttl@try#1{%
\edef\ttl@c{#1}% #1 is a list in the form \ttl@a{key}\ttl@a{key}
\@ifundefined{\ttl@b\ttl@c}{}{%
\edef\ttl@c{\expandafter\noexpand\csname\ttl@b\ttl@c\endcsname}%
\def\ttl@a##1{\csname ttl@extra@##1\endcsname}%
#1%
\let\ttl@try\@gobble}} % locally modified to `break' testings
% \ttl@write writes marks and toc. tocdepth is taken care of when
% the toc is typesetted and not here. Used always through
% ttl@savewrite, which is reset to \@empty to avoid duplicated
% calls.
\def\ttl@write#1#2{%
\ttl@blinemarks
\csname#1mark\endcsname{#2}%
\def\ttl@a{\protect\numberline{\@nameuse{the#1}}}%
\@nameuse{ttl@toc#1}% eg, \ttl@tocpart modifies \ttl@a
\ttl@addcontentsline{#1}{#2}% Depends on toctitles, uses \ttl@a
\ttl@elinemarks
\global\ttl@toclabelfalse
\global\let\ttl@savewrite\@empty}
\newif\ifttl@premark % to be used in ttlps.def
\ttl@premarkfalse
% 2019-06-20. Added the \lastskip stuff, because a mark 'forgets' the
% last skip.
\def\ttl@premark#1#2{%
\let\ttl@lastskip\relax
\ifvmode
\ifdim\lastskip=\z@\else
\edef\ttl@lastskip{\the\lastskip}%
\vskip-\ttl@lastskip\relax
\fi
\fi
\protected@xdef\ttl@prevmarks{\ttl@marks}%
\ttl@blinemarks
\csname#1mark\endcsname{#2}%
\ttl@elinemarks
\ifx\ttl@lastskip\relax\else
\vskip\ttl@lastskip\relax
\fi
\gdef\ttl@prevmarks{\ttl@marks}}
% Must be preceded by a default \ttl@savewrite, which is used
% in starred variants--\@empty in top and straight classes.
% In straight class, it is preceded by the setting of
% prev marks to provide a "fixed" top mark. Otherwise,
% the default prev mark (= curr mark) is used (restored
% after ttl@labelling in straight). This is the command
% to be hacked if you want to change the behaviour of
% starred variants.
\def\ttl@labelling#1#2{%
\let\ttl@Hy@saveanchor\@empty
\ifttl@label % 1st - if star
\def\ttl@savewrite{\ttl@write{#1}{#2}}%
\@nameuse{ttl@#1label}% eg, sets if mainmatter in chapter.
\ifttl@label % 2nd - eg, if not main matter
\ifnum\@nameuse{ttll@#1}>\c@secnumdepth\relax
\ttl@labelfalse % 3rd - if too deep
\else
\ttl@Hy@refstepcounter{#1}%
\@nameuse{ttl@#1out}%
\fi
\fi
\fi
\let\ifttl@toclabel\ifttl@label
\ifx\ttl@savewrite\@empty\else % If marks
\ifttl@ps
\ifttl@premark
\global\ttl@premarkfalse
\else % if no \pretitlemark
\ttl@premark{#1}{#2}%
\fi
\fi
\ifttl@label\else\ttl@Hy@steplink{#1}\fi
\fi}
% Executed by ttl@labelling if the name of section is chapter:
\def\ttl@chapterlabel{\if@mainmatter\else\ttl@labelfalse\fi}
% Executed by ttl@labelling if chapter has a number. Note
% you can define messages for other sectioning levels (eg,
% \ttl@sectionout).
\def\ttl@chapterout{\typeout{\chaptertitlename\space\thechapter.}}
% Straight class
% ~~~~~~~~~~~~~
% Default for nobottomtitles. Changed by nobottomtitles*
\def\ttl@addstretch{\advance\@tempskipa-\pagestretch}
% 1:name 2:level 3:indent 4:before 5:after 6:afind [7]:cap 8:title
% The second argument of ttl@sect is the level, which
% is empty if the star version is used. In this case
% neither the toc nor the marks are written.
\def\ttl@straight@i#1[#2]#3{%
\def\@currentlabelname{#2}% for nameref
\gdef\ttl@savemark{\csname#1mark\endcsname{#3}}%
\let\ttl@savewrite\@empty
\def\ttl@savetitle{#3}%
\gdef\thetitle{\csname the#1\endcsname}%
\if@noskipsec \leavevmode \fi
\par
\ttl@labelling{#1}{#2}%
\ttl@startargs\ttl@straight@ii{#1}{#3}}
% 1:left 2:right 3:before 4:after 5:afterindent 6:name 7:title
\def\ttl@straight@ii#1#2#3#4#5#6#7{%
\ttl@assign\@tempskipa#3\relax\beforetitleunit
\@ifundefined{ttl@ps@#6}{}%
{\PackageWarning{titlesec}{Page style in straight class ignored}}%
\if@nobreak
\ttl@titlespace{\@tempskipa}%
\else
\@ifundefined{#6break}%
{\addpenalty{\@secpenalty}}%
{\csname#6break\endcsname}%
\addvspace{\@tempskipa}%
\ifdim\bottomtitlespace<\z@
\else
\begingroup
\@tempskipb\pagegoal
\@tempskipa\pagegoal
\ttl@addstretch % \relax if nobottomtitle*
\advance\@tempskipa-\bottomtitlespace\relax % not a register
\pagegoal\@tempskipa
\def\@textbottom{\vskip\z@\@plus.0001fil}%
\penalty9999
\pagegoal\@tempskipb
\endgroup
\fi
\fi
\@afterindenttrue
\ifcase#5 \@afterindentfalse\fi
\ttl@assign\@tempskipb#4\relax\aftertitleunit
\ttl@select{#6}{#1}{#2}{#7}%
\ttl@finmarks
\@ifundefined{ttlp@#6}{}{\ttlp@write{#6}}%
\if@noskipsec
\global\@nobreakfalse
\everypar{%
\if@noskipsec
\global\@noskipsecfalse
\clubpenalty\@M
\hskip-\parindent
\begingroup
\@svsechd\unskip{\hspace{\@tempskipb}}%
\endgroup
\else
\clubpenalty\@clubpenalty\everypar{}%
\fi}%
\else
\par\nobreak
\vspace{\@tempskipb}%
\@afterheading
\fi
\ignorespaces}
% Part class
% ~~~~~~~~~~
\providecommand\partmark[1]{\markboth{}{}}
\def\ttl@part@i#1[#2]#3{%
\gdef\ttl@savemark{\csname#1mark\endcsname{#3}}%
\ifx\ttl@notocparts\@undefined
\def\ttl@savewrite{\ttl@write{#1}{#3}}% Not #2!
\else
\let\ttl@savewrite\@empty
\fi
\def\ttl@savetitle{#3}%
\ttl@labelling{#1}{#2}%
\ttl@startargs\ttl@part@ii{#1}{#3}}
\def\ttl@part@ii#1#2#3#4#5#6#7{%
\ttl@assign\@tempskipa#3\relax\beforetitleunit
\vspace*{\@tempskipa}%
\@ifundefined{ttl@ps@#6}{}%
{\PackageWarning{titlesec}{Page style in part class ignored}}%
\global\@afterindenttrue
\ifcase#5 \global\@afterindentfalse \fi
\ttl@assign\@tempskipb#4\relax\aftertitleunit
\ttl@select{#6}{#1}{#2}{#7}%
\ttl@finmarks
\@ifundefined{ttlp@#6}{}{\ttlp@write{#6}}%
\par\nobreak
\vspace{\@tempskipb}%
\@afterheading}
% Page class
% ~~~~~~~~~~
\def\ttl@page@i#1[#2]#3{%
\gdef\ttl@savemark{\csname#1mark\endcsname{#3}}%
\ifx\ttl@notocparts\@undefined
\def\ttl@savewrite{\ttl@write{#1}{#3}}% Not #2!
\else
\let\ttl@savewrite\@empty
\fi
\def\ttl@savetitle{#3}%
\ttl@labelling{#1}{#2}%
\ttl@startargs\ttl@page@ii{#1}{#3}}
\def\ttl@page@ii#1#2#3#4#5#6#7{%
\ttl@assign\@tempskipa#3\relax\beforetitleunit
\if@openright
\cleardoublepage
\else
\clearpage
\fi
\@ifundefined{ttl@ps@#6}%
{\thispagestyle{plain}}%
{\thispagestyle{\@nameuse{ttl@ps@#6}}}%
\if@twocolumn
\onecolumn
\@tempswatrue
\else
\@tempswafalse
\fi
\vspace*{\@tempskipa}%
\@afterindenttrue
\ifcase#5 \@afterindentfalse\fi
\ttl@assign\@tempskipb#4\relax\aftertitleunit
\ttl@select{#6}{#1}{#2}{#7}%
\ttl@finmarks
\@ifundefined{ttlp@#6}{}{\ttlp@write{#6}}%
\vspace{\@tempskipb}%
\newpage
\if@twoside
\if@openright
\null
\@ifundefined{ttl@ps@#6}%
{\thispagestyle{empty}}%
{\thispagestyle{\@nameuse{ttl@ps@#6}}}%
\newpage
\fi
\fi
\if@tempswa
\twocolumn
\fi
\ignorespaces}
% Top class and some makechapterhead stuff
% ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
%
% \ttl@mkchap is the new make(s)chapterhead.
\def\ttl@mkchap#1#2#3#4#5#6#7{%
\gdef\ttl@savemark{\csname#6mark\endcsname{#7}}%
\let\ttl@savewrite\@empty
\let\ttl@Hy@saveanchor\@empty
\@ifundefined{ttl@ps@#6}{}%
{\thispagestyle{\@nameuse{ttl@ps@#6}}}%
\let\ifttl@toclabel\ifttl@label
\ttl@mkchap@i{#1}{#2}{#3}{#4}{#5}{#6}{#7}}
% But \ttl@mkchap@i is used by both makechapterhead and
% the top class.
\def\ttl@mkchap@i#1#2#3#4#5#6#7{%
\ttl@assign\@tempskipa#3\relax\beforetitleunit
\vspace*{\@tempskipa}%
\global\@afterindenttrue
\ifcase#5 \global\@afterindentfalse\fi
\ttl@assign\@tempskipb#4\relax\aftertitleunit
\ttl@topmode{\@tempskipb}{%
\ttl@select{#6}{#1}{#2}{#7}}%
\ttl@finmarks % Outside the box!
\@ifundefined{ttlp@#6}{}{\ttlp@write{#6}}}
\def\ttl@top@i#1[#2]#3{%
\gdef\ttl@savemark{\csname#1mark\endcsname{#3}}%
\let\ttl@savewrite\@empty
\def\ttl@savetitle{#3}%
\ttl@labelling{#1}{#2}%
\ttl@startargs\ttl@top@ii{#1}{#3}}
\def\ttl@top@ii#1#2#3#4#5#6#7{%
\@ifundefined{#6break}%
{\if@openright
\cleardoublepage
\else
\clearpage
\fi}%
{\csname#6break\endcsname}%
\@ifundefined{ttl@ps@#6}%
{\thispagestyle{plain}}%
{\thispagestyle{\@nameuse{ttl@ps@#6}}}%
\global\@topnum\z@
\@ifundefined{#6tolists}%
{\addtocontents{lof}{\protect\ttl@tocsep}%
\addtocontents{lot}{\protect\ttl@tocsep}}
{\@nameuse{#6tolists}}%
\if@twocolumn
\@topnewpage[\ttl@mkchap@i{#1}{#2}{#3}{#4}{#5}{#6}{#7}]%
\else
\ttl@mkchap@i{#1}{#2}{#3}{#4}{#5}{#6}{#7}%
\@afterheading
\fi
\ignorespaces}
% \def\ttl@noskipsectrue{%
% \if@noskipsec
% \PackageError{titlesec}{Invalid shape for top class}%
% {The selected shape only makes sense when merged into\MessageBreak
% a paragraph. That is impossible in the top class}%
% \else
\newcommand\chaptertitlename{\@chapapp}
\def\ttl@tocsep{\addvspace{10\p@}}
% +-----------------+
% | S H A P E S |
% +-----------------+
%
% Reformatting Titles: Interface
% ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
% The surrounding space is stored in a macro
% named \ttls@<section> whose content is
% {left}{right}{before}{after}{afterindent}.
% But if there is the page key, the name is
% \ttls@<section>/<page>
\newcommand\titlespacing{%
\@ifstar{\ttl@spacing@i{\z@}}{\ttl@spacing@i{\@ne}}}
\def\ttl@spacing@i#1#2#3#4#5{%
\ttl@getkeys{#2}{titlesec}%
\@ifnextchar[{%
\ttl@spacing@ii{#1}{#3}{#4}{#5}%
}{%
\ttl@spacing@ii{#1}{#3}{#4}{#5}[\z@]}}
\def\ttl@spacing@ii#1#2#3#4[#5]{%
\expandafter\def\csname ttls@\ttl@a\endcsname
{{#2}{#5}{#3}{#4}{#1}}}
% The section name is built in \ttl@a.
% The format is stored in a macro named \ttlf@<section>,
% or \ttlf@<section>/<page> if there is the page spec,
% or \ttlf@.../* if numberless is true
% whose content is
% \ttl@<shape>{format}{label}{sep}{before}{after}
\newtoks\ttl@toksa
\newcommand\titleformat{%
\@ifstar{\ttl@format@s}%
{\ttl@format@i}}
\def\ttl@format@s#1#2{%
\edef\ttl@a{\expandafter\@gobble\string#1}%
\@ifundefined{ttlf@\ttl@a}%
{\PackageError{titlesec}{Not allowed in `easy' settings}
{The sectiong command you are trying to redefine\MessageBreak
is not handled by the starred variant (eg, \string\part)}}{}
\expandafter\expandafter\expandafter
\ttl@format@si\csname ttlf@\ttl@a \endcsname
{#2}}
\def\ttl@format@si#1#2#3#4#5#6#7{%
\@namedef{ttlf@\ttl@a}{#1{#7}{#3}{#4}{#5}{#6}}}
\def\ttl@format@i#1{%
\@ifnextchar[{\ttl@format@ii{#1}}{\ttl@format@ii{#1}[hang]}}
\def\ttl@format@ii#1[#2]#3#4#5#6{%
\ttl@getkeys{#1}{titlesec}%
\ttl@toksa{{#3}{#4}{#5}{#6}}% Save arguments
\@ifnextchar[{%
\ttl@format@iii{#2}%
}{%
\ttl@format@iii{#2}[]}}
% First, we get the shape -- if not defined it loads
% the corresponding file.
\def\ttl@format@iii#1[#2]{%
\@ifundefined{ttlh@#1}{%
\begingroup
\makeatletter
\InputIfFileExists{#1.tss}{}{%
\@ifundefined{ttlhx@#1}%
{\PackageError{titlesec}{Unknown shape}%
{Shapes are defined in files with extension tss\MessageBreak
Either you have misspelled the shape\MessageBreak
or there is no a #1.tss file}}%
{\global\expandafter
\let\csname ttlh@#1\expandafter\endcsname
\csname ttlhx@#1\endcsname}}%
\endgroup}{}%
\@temptokena{#2}%
\ifttl@explicit
\edef\ttl@b{%
\def\expandafter\noexpand\csname ttlf@\ttl@a\endcsname####1%
{\expandafter\noexpand\csname ttlh@#1\endcsname
\the\ttl@toksa{\the\@temptokena}}}%
\else
\edef\ttl@b{%
\def\expandafter\noexpand\csname ttlf@\ttl@a\endcsname
{\expandafter\noexpand\csname ttlh@#1\endcsname
\the\ttl@toksa{\the\@temptokena}}}%
\fi
\ttl@b
\csname ttl@compat\ttl@a\endcsname}
% Styles
% ~~~~~~
%
% \ttl@<shape> and \ttlh@<shape> take the following eight
% arguments:
% {format}{label}{sep}{before}{after}{left}{right}{title}
% where before and after refer to the format.
% With the option explicit, #4 contains the title and #8 is
% empty.
\def\ttl@strut{\strut}
\def\ttlh@display#1#2#3#4#5#6#7#8{%
\gdef\ttl@makeline##1{\ttl@calc\hspace{#6}##1\ttl@calc\hspace{#7}}%
\setlength\leftskip{#6}%
\setlength\rightskip{#7}%
\interlinepenalty\@M
\ttl@changecentercr
\ttl@defnostruts
\ttl@beginlongest
#1\ifhmode\ttl@hmode@error\fi
\ttl@glcmds
\parindent\z@
\ifttl@label
{#2\ttl@strut\@@par}\nobreak\ttl@calc\vspace{#3}%
\fi
#4{#8}%
\kern\z@\ttl@strut\@@par
\nobreak\ttl@midlongest#5\@@par
\ttl@endlongest}
\def\ttlh@hang#1#2#3#4#5#6#7#8{%
\gdef\ttl@makeline##1{\ttl@calc\hspace{#6}##1\ttl@calc\hspace{#7}}%
\setlength\leftskip{#6}%
\setlength\rightskip{#7}%
\interlinepenalty\@M
\ttl@changecentercr
\ttl@defnostruts
\ttl@beginlongest
#1{\ifhmode\ttl@hmode@error\fi
\ttl@glcmds
\parindent\z@
\begingroup
\ifttl@label
\noindent
\sbox\z@{#2\ttl@strut\ttl@calc\hspace{#3}}%
\hangindent\wd\z@
\box\z@
\fi
#4{#8}%
\kern\z@\ttl@strut\@@par
\endgroup
\nobreak\ttl@midlongest#5\@@par}%
\ttl@endlongest}
\def\ttlh@runin#1#2#3#4#5#6#7#8{%
\global\@noskipsectrue
\gdef\ttl@makeline##1{##1}%
\ttl@changecentercr
\ttl@defnostruts
#1{\ifhmode\ttl@hmode@error\fi
\global\sbox\ttl@box{%
\ttl@calc\hspace{#6}%
\ifttl@label{\ttl@strut#2}\ttl@calc\hspace{#3}\fi
#4{#8}#5\unskip}}%
\gdef\@svsechd{\unhbox\ttl@box}}
% ----------
\gdef\ttlhx@block#1#2#3#4#5#6#7#8{%
\gdef\ttl@makeline##1{\ttl@calc\hspace{#6}##1\ttl@calc\hspace{#7}}%
\setlength\leftskip{#6}%
\setlength\rightskip{#7}%
\interlinepenalty\@M
\ttl@changecentercr
\ttl@defnostruts
\ttl@beginlongest
#1% \ifhmode\ttl@hmode@error\fi
\ttl@glcmds
\parindent\z@
\leavevmode
\ifttl@label
{#2}%
\setlength\@tempskipa{#3}%
\ifdim\@tempskipa=\z@\else\ttl@calc\hspace{#3}\fi
\fi
#4{#8}%
\kern\z@\ttl@strut\@@par
\nobreak\ttl@midlongest#5\@@par
\ttl@endlongest}
\gdef\ttlhx@frame#1#2#3#4#5#6#7#8{%
\def\ttl@filleft##1{\hfill}%
\def\ttl@filright##1{\hfill}%
\gdef\ttl@makeline##1{%
\ttl@calc\hspace{#6}##1\ttl@calc\hspace{#7}}%
\interlinepenalty\@M
\ttl@changecentercr
\ttl@defnostruts
#1\ifhmode\ttl@hmode@error\fi
\parindent\z@
\leavevmode
\@tempdima\fboxrule
\addtolength\@tempdima{#3}%
\setlength\leftskip{#6}%
\setlength\rightskip{#7}%
\lower\@tempdima\hbox{%
\everypar{}%
\setbox\z@\hbox{#2}%
\addtolength\hsize{-#6}%
\addtolength\hsize{-#7}%
\@tempdima\dp\z@ % 2002/3/22
\advance\@tempdima.5\ht\z@
\vbox{%
\hbox to \hsize{%
\leaders\hrule\@height\fboxrule\ttl@filleft{#3}%
\ifttl@label\lower.5\ht\z@\box\z@\fi
\leaders\hrule\@height\fboxrule\ttl@filright{#3}}%
\vskip-\lineskip
\ifttl@label\vskip-\@tempdima\fi
\hbox{%
\vrule\@width\fboxrule
\kern-\fboxrule
\vbox{%
\ttl@calc\vspace{#3}%
\leavevmode
\addtolength\leftskip {#3}\addtolength\leftskip{-#6}%
\addtolength\rightskip{#3}\addtolength\rightskip{-#7}%
\ttl@strut#4{#8}\kern\z@\ttl@strut\@@par
\ttl@calc\vspace{#3}}%
\kern-\fboxrule
\vrule\@width\fboxrule}%
\hrule\@height\fboxrule}}%
\@@par\nobreak#5\@@par}
\gdef\ttlhx@leftmargin#1#2#3#4#5#6#7#8{%
\global\@noskipsectrue
\addtolength\@tempskipb{#6}%
\xdef\ttl@makeline##1{\hskip-\the\@tempskipb\relax##1}%
\leftskip\z@skip
\rightskip\z@skip
\ttl@changecentercr
\ttl@defnostruts
#1\ifhmode\ttl@hmode@error\fi
\parindent\z@
\global\setbox\ttl@box\vtop{%
\setlength\hsize{#6}%
\linewidth\hsize
\everypar{}%
\color@begingroup
\ifttl@label{\ttl@strut#2\ttl@strut}\ttl@calc\hspace{#3}\fi
\ttl@strut#4{#8}\kern\z@\ttl@strut\@@par
\color@endgroup}%
\advance\@tempskipa\ht\ttl@box
\advance\@tempskipa\dp\ttl@box
\advance\@tempskipa-\pagegoal
\advance\@tempskipa\pagestretch
\@tempskipb\pagegoal
\pagegoal-\@tempskipa
\ifdim\bottomtitlespace<\z@\else
\def\@textbottom{\vskip\z@\@plus.0001fil}%
\fi
\penalty9999
\pagegoal\@tempskipb
\dp\ttl@box=\z@
\gdef\@svsechd##1##2{%
\llap{\box\ttl@box##2}%
\if@afterindent\hskip\parindent\fi
#5}}
\let\ttlhx@margin\ttlhx@leftmargin
\gdef\ttlhx@rightmargin#1#2#3#4#5#6#7#8{%
\global\@noskipsectrue
\addtolength\@tempskipb{#6}%
\xdef\ttl@makeline##1{##1\hskip-\the\@tempskipb}%
\leftskip\z@skip
\rightskip\z@skip
\ttl@changecentercr
\ttl@defnostruts
#1\ifhmode\ttl@hmode@error\fi
\parindent\z@
\global\setbox\ttl@box\vtop{%
\setlength\hsize{#6}%
\linewidth\hsize
\everypar{}%
\color@begingroup
\ifttl@label{\ttl@strut#2\ttl@strut}\ttl@calc\hspace{#3}\fi
\ttl@strut#4{#8}\kern\z@\ttl@strut\@@par
\color@endgroup}%
\advance\@tempskipa\ht\ttl@box
\advance\@tempskipa\dp\ttl@box
\advance\@tempskipa-\pagegoal
\advance\@tempskipa\pagestretch
\@tempskipb\pagegoal
\pagegoal-\@tempskipa
\ifdim\bottomtitlespace<\z@\else
\def\@textbottom{\vskip\z@\@plus.0001fil}%
\fi
\penalty9999
\pagegoal\@tempskipb
\dp\ttl@box=\z@
\gdef\@svsechd##1##2{%
\rlap{\hskip\textwidth##2\box\ttl@box}%
\if@afterindent\hskip\parindent\fi}}
\gdef\ttlhx@wrap#1#2#3#4#5#6#7#8{%
\global\@noskipsectrue
\gdef\ttl@makeline##1{##1}%
\ttl@changecentercr
\ttl@defnostruts
\begingroup
#1\ifhmode\ttl@hmode@error\fi
\titlewidth\z@
\def\\{\@ifstar{\@ifnextchar[{\ttl@bs}{\newline}}%
{\@ifnextchar[{\ttl@bs}{\newline}}}%
\def\ttl@bs[##1]{\newline}%
\let\@centercr\\%
\advance\rightskip 1\leftskip plus 1fil
\leftskip=\z@
\parindent\z@
\let\iftitlemeasuring\@firstoftwo
\global\setbox\ttl@box\vtop{\setlength\hsize{#6}%
\color@begingroup
\ifttl@label{#2}\ttl@calc\hspace{#3}\fi
#4{#8}\kern\z@\ttl@strut
\@@par
\color@endgroup}%
\let\iftitlemeasuring\@secondoftwo
\ttl@boxprocess
\global\titlewidth\titlewidth
\global\titlewidthfirst\titlewidthfirst
\global\titlewidthlast\titlewidthlast
\endgroup
\edef\ttl@maxdimen{\the\titlewidth}%
#1\ifhmode\ttl@hmode@error\fi
\global\setbox\ttl@box\vtop{\setlength\hsize{\ttl@maxdimen}%
\color@begingroup
\ifttl@label{#2}\ttl@calc\hspace{#3}\fi#4{#8}\kern\z@\ttl@strut
\@@par
\color@endgroup}%
\advance\@tempskipa1.5\baselineskip
\advance\@tempskipa\ht\ttl@box
\advance\@tempskipa\dp\ttl@box
\advance\@tempskipa-\pagegoal
\advance\@tempskipa\pagestretch
\@tempskipb\pagegoal
\pagegoal-\@tempskipa
\ifdim\bottomtitlespace<\z@\else
\def\@textbottom{\vskip\z@\@plus.0001fil}%
\fi
\penalty9999
\pagegoal\@tempskipb
\@tempdima\ht\ttl@box \advance\@tempdima\dp\ttl@box
\@tempdimb\@tempdima
\divide\@tempdima\baselineskip \count@\@tempdima
\advance\count@
\ifdim\@tempdimb<\the\[email protected]\baselineskip\@ne\else\tw@\fi
\dp\ttl@box=\z@
\xdef\@svsechd##1##2{%
\noexpand\llap{\box\ttl@box##2}%
\setbox\z@\hbox{\hskip\ttl@maxdimen\relax##2}%
\global\hangindent\wd\z@
\global\hangafter-\the\count@\relax}}
\gdef\ttlhx@drop#1#2#3#4#5#6#7#8{%
\global\@noskipsectrue
\gdef\ttl@makeline##1{##1}%
\ttl@changecentercr
\ttl@defnostruts
#1\ifhmode\ttl@hmode@error\fi
\parindent\z@