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ltfinal.dtx
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% \iffalse meta-comment
%
% Copyright (C) 1993-2021
% The LaTeX3 Project and any individual authors listed elsewhere
% in this file.
%
% This file is part of the LaTeX base system.
% -------------------------------------------
%
% It 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.
% The latest version of this license is in
% https://www.latex-project.org/lppl.txt
% and version 1.3c or later is part of all distributions of LaTeX
% version 2008 or later.
%
% This file has the LPPL maintenance status "maintained".
%
% The list of all files belonging to the LaTeX base distribution is
% given in the file `manifest.txt'. See also `legal.txt' for additional
% information.
%
% The list of derived (unpacked) files belonging to the distribution
% and covered by LPPL is defined by the unpacking scripts (with
% extension .ins) which are part of the distribution.
%
% \fi
%
% \iffalse
%%% From File: ltfinal.dtx
%
%<*driver>
% \fi
\ProvidesFile{ltfinal.dtx}
[2021/01/06 v2.2l LaTeX Kernel (Final Settings)]
% \iffalse
\documentclass{ltxdoc}
\GetFileInfo{ltfinal.dtx}
\title{\filename}
\date{\filedate}
\author{%
Johannes Braams\and
David Carlisle\and
Alan Jeffrey\and
Leslie Lamport\and
Frank Mittelbach\and
Chris Rowley\and
Rainer Sch\"opf}
\begin{document}
\MaintainedByLaTeXTeam{latex}
\maketitle
\DocInput{ltfinal.dtx}
\end{document}
%</driver>
% \fi
%
%
% \section{Final settings}
% This section contains the final settings for \LaTeX. It initializes
% some debugging and typesetting parameters, sets the default
% |\catcode|s and uc/lc codes, and inputs the hyphenation file.
%
% \StopEventually{}
%
% \changes{v0.1a}{1994/03/07}{Initial version, split from latex.dtx}
% \changes{v0.1a}{1994/03/07}{Remove oldcomments environment}
% \changes{v0.1c}{1994/04/21}{Added comments, set the catcodes of
% 128--255.}
% \changes{v0.1d}{1994/04/23}{Check that \cs{font@submax} is still zero}
% \changes{v0.1e}{1994/05/02}{Set all the catcodes}
% \changes{v0.1f}{1994/05/03}{Set the catcode of control-J to be
% `other', for use in messages.}
% \changes{v0.1g}{1994/05/05}{Added empty errhelp.}
% \changes{v0.1h}{1994/05/13}{Added package ot1enc, and defined
% \cs{@acci}, \cs{@accii} and \cs{@acciii}.}
% \changes{v0.1j}{1994/05/18}{Corrected the lccode for d-bar.}
% \changes{v0.1k}{1994/05/19}{Removed \cs{makeat...}}
% \changes{v1.0n}{1994/05/31}{Renamed lthyphen.* to lthyphen.*.}
% \changes{v1.0o}{1994/11/17}
% {\cs{@tempa} to \cs{reserved@a}}
% \changes{v1.0p}{1994/12/01}
% {Renamed lthyphen.* to hyphen.*.}
% \changes{v1.0r}{1995/06/05}
% {Added \cs{MakeUppercase} and \cs{MakeLowercase}.}
% \changes{v1.0s}{1995/06/06}
% {Made \cs{MakeUppercase} and \cs{MakeLowercase} brace their
% argument.}
% \changes{v2.0r}{2016/10/15}{Require e\TeX{}}
% \changes{v2.0s}{2016/10/15}{Tidy up status of char 127}
% \changes{v2.2i}{2020/08/21}{Integration of new hook management interface}
%
%
%
%
% \subsection{Debugging}
%
% By default, \LaTeX{} shows statistics:
% \begin{macrocode}
%<*2ekernel>
\tracingstats1
% \end{macrocode}
%
% \subsection{Typesetting parameters}
%
% \begin{macro}{\@lowpenalty}
% \begin{macro}{\@medpenalty}
% \begin{macro}{\@highpenalty}
% These are penalties used internally.
% \begin{macrocode}
\newcount\@lowpenalty
\newcount\@medpenalty
\newcount\@highpenalty
% \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
%
%
%\begin{macro}{\newmarks}
% \changes{v2.0a}{2014/12/30}{macro added}
% \changes{v2.0b}{2015/01/23}{use reserved count 256}
% \changes{v2.0g}{2015/06/19}{Use $-1$ for first range to get contiguous allocation}
% Allocate extended marks types if etex is active.
% Placed here at the end of the format
% to increase compatibility with count allocations
% in earlier releases.
% \begin{macrocode}
%</2ekernel>
%<*2ekernel|latexrelease>
%<latexrelease>\IncludeInRelease{2015/01/01}%
%<latexrelease> {\newmarks}{Extended Allocation}%
% \end{macrocode}
%
% \begin{macrocode}
\ifx\marks\@undefined\else
\def\newmarks{%
\e@alloc\marks \e@alloc@chardef{\count256}\m@ne\e@alloc@top}
\fi
% \end{macrocode}
%
% \begin{macrocode}
%</2ekernel|latexrelease>
%<latexrelease>\EndIncludeInRelease
%<latexrelease>\IncludeInRelease{0000/00/00}%
%<latexrelease> {\newmarks}{Extended Allocation}%
%<latexrelease>\let\newmarks\@undefined
%<latexrelease>\EndIncludeInRelease
%<*2ekernel>
% \end{macrocode}
% \end{macro}
%
%\begin{macro}{\newXeTeXintercharclass}
% \changes{v2.0a}{2014/12/30}{macro added}
% \changes{v2.0b}{2015/01/23}{use reserved count 257}
% \changes{v2.0f}{2015/04/28}{define \cs{xe@alloc@intercharclass} for compatibility with older xelatex initialization}
%\begin{macro}{\xe@alloc@intercharclass}
%\begin{macro}{\e@alloc@intercharclass@top}
% \changes{v2.0j}{2016/01/04}{Start allocation at one not three}
% \changes{v2.0k}{2016/01/05}{Remove duplicated code}
% Allocate |\XeTeXintercharclass| types if xetex is active.
% previously defined in |xetex.ini|.
%
% \begin{macrocode}
%</2ekernel>
%<*2ekernel|latexrelease>
%<latexrelease>\IncludeInRelease{2015/01/01}%
%<latexrelease> {\newXeTeXintercharclass}{Extended Allocation}%
% \end{macrocode}
%
% Classes allocated 1 to 4094 (or 254 on older xetex)
% (In earlier XeLaTeX versions 1, 2 and 3 were pre-set for CJK).
% \changes{v2.0g}{2015/06/19}{Use $-1$ for first range to get contiguous allocation}
% \changes{v2.0q}{2016/04/22}{XeTeX 0.99996 has 4096 char classes not 256}
% \begin{macrocode}
\ifx\XeTeXcharclass\@undefined
\else
% \end{macrocode}
% \begin{macrocode}
\ifdim\the\XeTeXversion\XeTeXrevision\p@>0.99993\p@
\chardef\e@alloc@intercharclass@top=4095
\else
\chardef\e@alloc@intercharclass@top=255
\fi
% \end{macrocode}
% \begin{macrocode}
\def\newXeTeXintercharclass{%
\e@alloc\XeTeXcharclass
\chardef\xe@alloc@intercharclass\m@ne\e@alloc@intercharclass@top}
\fi
% \end{macrocode}
%
% \begin{macrocode}
%</2ekernel|latexrelease>
%<latexrelease>\EndIncludeInRelease
%<latexrelease>\IncludeInRelease{0000/00/00}%
%<latexrelease> {\newXeTeXintercharclass}{Extended Allocation}%
%<latexrelease> \ifx\XeTeXcharclass\@undefined
%<latexrelease> \else
%<latexrelease> \def\xe@alloc@#1#2#3#4#5{\global\advance#1\@ne
%<latexrelease> \xe@ch@ck#1#4#2%
%<latexrelease> \allocationnumber#1%
%<latexrelease> \global#3#5\allocationnumber
%<latexrelease> \wlog{\string#5=\string#2\the\allocationnumber}}
%<latexrelease> \def\xe@ch@ck#1#2#3{%
%<latexrelease> \ifnum#1<#2\else
%<latexrelease> \errmessage{No room for a new #3}%
%<latexrelease> \fi}
%<latexrelease> \def\newXeTeXintercharclass{%
%<latexrelease> \xe@alloc@\xe@alloc@intercharclass
%<latexrelease> \XeTeXcharclass\chardef\@cclv}
%<latexrelease> \fi
%<latexrelease>\EndIncludeInRelease
%<*2ekernel|latexrelease>
%<latexrelease>\IncludeInRelease{2016/02/01}%
%<latexrelease> {\xe@alloc@intercharclass}{Start of XeTeX class allocator}%
\ifx\XeTeXcharclass\@undefined
\else
\countdef\xe@alloc@intercharclass=257
\xe@alloc@intercharclass=\z@
\fi
%</2ekernel|latexrelease>
%<latexrelease>\EndIncludeInRelease
%<latexrelease>\IncludeInRelease{2015/01/01}%
%<latexrelease> {\xe@alloc@intercharclass}{Start of XeTeX class allocator}%
%<latexrelease> \ifx\XeTeXcharclass\@undefined
%<latexrelease> \else
%<latexrelease> \xe@alloc@intercharclass=\thr@@
%<latexrelease> \fi
%<latexrelease>\EndIncludeInRelease
%<latexrelease>\IncludeInRelease{0000/00/00}%
%<latexrelease> {\xe@alloc@intercharclass}{Start of XeTeX class allocator}%
%<latexrelease> \ifx\XeTeXcharclass\@undefined
%<latexrelease> \else
%<latexrelease> \newcount\xe@alloc@intercharclass
%<latexrelease> \xe@alloc@intercharclass=\thr@@
%<latexrelease> \fi
%<latexrelease>\EndIncludeInRelease
%<*2ekernel>
% \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
%
%
%
% The default values of the picture and |\fbox| parameters:
% \begin{macrocode}
\unitlength = 1pt
\fboxsep = 3pt
\fboxrule = .4pt
% \end{macrocode}
% The saved value of \TeX's |\maxdepth|:
% \begin{macrocode}
\@maxdepth = \maxdepth
% \end{macrocode}
% |\vsize| initialized because a |\clearpage| with |\vsize < \topskip|
% causes trouble.
% |\@colroom| and |\@colht| also initialized because |\vsize| may be
% set to them if a |\clearpage| is done before the |\begin{document}|
%
% \begin{macrocode}
\vsize = 1000pt
\@colroom = \vsize
\@colht = \vsize
% \end{macrocode}
% Initialise |\textheight| |\textwidth| and page style, to avoid
% internal errors if they are not set by the class.
% \changes{v0.1b}{1994/04/18}
% {Initialise \cs{textheight}, \cs{textwidth} and page style}
% \begin{macrocode}
\textheight=.5\maxdimen
\textwidth=\textheight
\ps@empty
% \end{macrocode}
%
% \subsection{Lccodes for hyphenation}
%
% \changes{v2.0a}{2015/01/03}{Unicode data loading added}
% \changes{v2.0c}{2015/01/24}{Skip T1-code entirely with Unicode engines}
% \changes{v2.0d}{2015/03/26}{Use renamed
% \texttt{unicode-letters.def}}
% \changes{v2.0i}{2015/12/10}{Use new common Unicode data loaders}
% \changes{v2.0j}{2016/01/04}{Do not set up inter character classes for
% XeTeX}
% \changes{v2.0l}{2016/01/05}{Correct \textsf{latexrelease} guards}
% \changes{v2.0l}{2016/01/05}{Ensure old definitions for inter-character
% class toks are available using \textsf{latexrelease}}
% \changes{v2.0m}{2016/01/05}{Undefine XeTeX classes when using patching
% an older kernel}
% \changes{v2.0l}{2016/01/05}{Missing brace}
% \changes{v2.0p}{2016/01/05}{Only apply XeTeX change if XeTeX is in use}
% For $7$- and $8$-bit engines the assumption of T1 encodings is the
% basis for the hyphenation patterns. That's not the case for the Unicode
% engines, where the assumption is engine-native working. The common
% loader system provides access to data from the Unicode Consortium
% covering not only |\lccode| but also other related data. The
% |\lccode| part of that at least needs to be loaded before hyphenation is
% tackled: Xe\TeX{} follows the standard \TeX{} route of building patterns
% into the format. Lua\TeX{} doesn't require this data be loaded \emph{here}
% but it does need to be loaded somewhere. Rather than test for the Unicode
% engines by name, the approach here is to look for the extended math mode
% handling both provide: any other engine developed in this area will
% presumably also provide |\Umathcode|.
% \begin{macrocode}
\ifnum 0%
\ifx\Umathcode\@undefined\else 1\fi
\ifx\XeTeXmathcode\@undefined\else 1\fi
>\z@
\message{ Unicode character data,}
\input{load-unicode-data}
%</2ekernel>
%<latexrelease>\IncludeInRelease{2016/02/01}%
%<latexrelease> {\XeTeXintercharclasses}{XeTeX character classes}%
%<latexrelease> \ifx\XeTeXinterchartoks\undefined
%<latexrelease> \else
%<latexrelease> \begingroup
%<latexrelease> \chardef\XeTeXcharclassID = 0 %
%<latexrelease> \chardef\XeTeXcharclassOP = 0 %
%<latexrelease> \chardef\XeTeXcharclassCL = 0 %
%<latexrelease> \chardef\XeTeXcharclassEX = 0 %
%<latexrelease> \chardef\XeTeXcharclassIS = 0 %
%<latexrelease> \chardef\XeTeXcharclassNS = 0 %
%<latexrelease> \chardef\XeTeXcharclassCM = 0 %
%<latexrelease> \input{load-unicode-xetex-classes}
%<latexrelease> \endgroup
%<latexrelease> \global\let\xtxHanGlue\undefined
%<latexrelease> \global\let\xtxHanSpace\undefined
%<latexrelease> \global\XeTeXinterchartoks 0 1 = {}
%<latexrelease> \global\XeTeXinterchartoks 0 2 = {}
%<latexrelease> \global\XeTeXinterchartoks 0 3 = {}
%<latexrelease> \global\XeTeXinterchartoks 1 0 = {}
%<latexrelease> \global\XeTeXinterchartoks 2 0 = {}
%<latexrelease> \global\XeTeXinterchartoks 3 0 = {}
%<latexrelease> \global\XeTeXinterchartoks 1 1 = {}
%<latexrelease> \global\XeTeXinterchartoks 1 2 = {}
%<latexrelease> \global\XeTeXinterchartoks 1 3 = {}
%<latexrelease> \global\XeTeXinterchartoks 2 1 = {}
%<latexrelease> \global\XeTeXinterchartoks 2 2 = {}
%<latexrelease> \global\XeTeXinterchartoks 2 3 = {}
%<latexrelease> \global\XeTeXinterchartoks 3 1 = {}
%<latexrelease> \global\XeTeXinterchartoks 3 2 = {}
%<latexrelease> \global\XeTeXinterchartoks 3 3 = {}
%<latexrelease> \fi
%<latexrelease>\EndIncludeInRelease
%<latexrelease>\IncludeInRelease{0000/00/00}%
%<latexrelease> {\XeTeXintercharclasses}{XeTeX character classes}%
%<latexrelease> \ifx\XeTeXinterchartoks\undefined
%<latexrelease> \else
%<latexrelease> \input{load-unicode-xetex-classes}
%<latexrelease> \gdef\xtxHanGlue{\hskip0pt plus 0.1em\relax}
%<latexrelease> \gdef\xtxHanSpace{\hskip0.2em plus 0.2em minus 0.1em\relax}
%<latexrelease> \global\XeTeXinterchartoks 0 1 = {\xtxHanSpace}
%<latexrelease> \global\XeTeXinterchartoks 0 2 = {\xtxHanSpace}
%<latexrelease> \global\XeTeXinterchartoks 0 3 = {\nobreak\xtxHanSpace}
%<latexrelease> \global\XeTeXinterchartoks 1 0 = {\xtxHanSpace}
%<latexrelease> \global\XeTeXinterchartoks 2 0 = {\nobreak\xtxHanSpace}
%<latexrelease> \global\XeTeXinterchartoks 3 0 = {\xtxHanSpace}
%<latexrelease> \global\XeTeXinterchartoks 1 1 = {\xtxHanGlue}
%<latexrelease> \global\XeTeXinterchartoks 1 2 = {\xtxHanGlue}
%<latexrelease> \global\XeTeXinterchartoks 1 3 = {\nobreak\xtxHanGlue}
%<latexrelease> \global\XeTeXinterchartoks 2 1 = {\nobreak\xtxHanGlue}
%<latexrelease> \global\XeTeXinterchartoks 2 2 = {\nobreak\xtxHanGlue}
%<latexrelease> \global\XeTeXinterchartoks 2 3 = {\xtxHanGlue}
%<latexrelease> \global\XeTeXinterchartoks 3 1 = {\xtxHanGlue}
%<latexrelease> \global\XeTeXinterchartoks 3 2 = {\xtxHanGlue}
%<latexrelease> \global\XeTeXinterchartoks 3 3 = {\nobreak\xtxHanGlue}
%<latexrelease> \fi
%<latexrelease>\EndIncludeInRelease
%<*2ekernel>
% \end{macrocode}
% \changes{v2.0d}{2015/02/03}{Set \cs{lccode} for \texttt{-} with Unicode
% engines}
% There is one over-ride that makes sense here (see below for the same for
% $8$-bit engines): setting the lccode for |-| to itself.
% \begin{macrocode}
\lccode`\- =`\- % default hyphen char
% \end{macrocode}
% The alternative is that a ``traditional'' engine is in use.
% \begin{macrocode}
\else
% \end{macrocode}
% \changes{v1.1b}{1998/05/20}{Set up lccodes before loading
% hyphenation files: pr/2639}
% We set things up so that hyphenation files can assume that the
% default (T1) lccodes are in use (at present this also sets up the
% uccodes).
% We temporarily define |\reserved@a| to apply |\reserved@c| to
% all the numbers in the range of its arguments.
% \begin{macrocode}
\def\reserved@a#1#2{%
\@tempcnta#1\relax
\@tempcntb#2\relax
\reserved@b
}
\def\reserved@b{%
\ifnum\@tempcnta>\@tempcntb\else
\reserved@c\@tempcnta
\advance\@tempcnta\@ne
\expandafter\reserved@b
\fi
}
% \end{macrocode}
% Depending on the \TeX{} version, we might not be allowed to do
% this for non-ASCII characters.
% \changes{v1.0n}{1994/06/09}{For \TeX2, do not set codes for higher
% half of character table.}
% \begin{macrocode}
\def\reserved@c#1{%
\count@=#1\advance\count@ by -"20
\uccode#1=\count@
\lccode#1=#1
}
\reserved@a{`\a}{`\z}
\reserved@a{"A0}{"BC}
\reserved@a{"E0}{"FF}
% \end{macrocode}
% The upper case characters need their |\uccode| and |\lccode| values
% set, and their |\sfcode| set to 999.
% \begin{macrocode}
\def\reserved@c#1{%
\count@=#1\advance\count@ by "20
\uccode#1=#1
\lccode#1=\count@
\sfcode#1=999
}
\reserved@a{`\A}{`\Z}
\reserved@a{"80}{"9C}
\reserved@a{"C0}{"DF}
% \end{macrocode}
% Well, it would be nice if that were correct, but unfortunately, the
% Cork encoding contains some odd slots whose uccode or lccode isn't
% quite what you'd expect.
% \begin{macrocode}
\uccode`\^^Y=`\I % dotless i
\lccode`\^^Y=`\^^Y % dotless i
\uccode`\^^Z=`\J % dotless j, ae in OT1
\lccode`\^^Z=`\^^Z % dotless j, ae in OT1
\lccode`\^^9d=`\i % dotted I
\uccode`\^^9d=`\^^9d % dotted I
\lccode`\^^9e=`\^^9e % d-bar
\uccode`\^^9e=`\^^d0 % d-bar
% \end{macrocode}
% Finally here is one that helps hyphenation in the OT1 encoding.
% \changes{v1.0z}{1996/10/31}
% {Added extra \cs{lcode}, hoping it does no harm in T1 (pr/1969)}
% \begin{macrocode}
\lccode`\^^[=`\^^[ % oe in OT1
% \end{macrocode}
%
% And we also set the |\lccode| of |\-| and |\textcompwordmark| so
% that they do not prevent hyphenation in the remainder of the word
% (as suggested by Lars Helstr\"om).
% \changes{v1.1e}{2003/10/13}
% {Added extra \cs{lccode} for \cs{-} and \cs{textcompwordmark}}
% \begin{macrocode}
\lccode`\- =`\- % default hyphen char
\lccode 127=127 % alternate hyphen char
\lccode 23 =23 % textcompwordmark in T1
% \end{macrocode}
%
% End of the conditional to select either Unicode or T1 encoding defaults.
% \begin{macrocode}
\fi
% \end{macrocode}
%
% \changes{v2.2b}{2020/07/08}
% {Add a last-minute hook for \textsf{expl3}}
% At this stage, we can install any last-minute \textsf{expl3} set-up.
% \begin{macrocode}
\@expl@finalise@setup@@
\def\@expl@finalise@setup@@{}
% \end{macrocode}
%
% This is as good a place as any to active a few Xe\TeX{}-specific
% settings
% \begin{macrocode}
\ifx\XeTeXuseglyphmetrics\@undefined
\else
\XeTeXuseglyphmetrics=1 %
\XeTeXdashbreakstate=1 %
\fi
% \end{macrocode}
%
% \subsection{Hyphenation}
%
% \changes{v0.1a}{1994/03/07}{move code here from lhyphen.dtx}
% \changes{v0.1a}{1994/03/07}
% {use \cs{InputIfFileExists} not \cs{IfFileExists}}
% \changes{v1.0x}{1995/11/01}
% {(DPC) Switch meaning of \cs{@addtofilelist} for cfg files}%
% The following code will be compiled into the format file. It checks
% for the existence of \texttt{hyphen.cfg} in inputs that file if
% found. Otherwise it inputs \texttt{hyphen.ltx}. Note that these
% are loaded in \emph{before} the |\catcode|s are set, so local
% hyphenation files can use 8-bit input.
%
% We try to load the customized hyphenation description file.
% \begin{macrocode}
\InputIfFileExists{hyphen.cfg}
{\typeout{===========================================^^J%
Local configuration file hyphen.cfg used^^J%
===========================================}%
\def\@addtofilelist##1{\xdef\@filelist{\@filelist,##1}}%
}
{\input{hyphen.ltx}}
\let\@addtofilelist\@gobble
% \end{macrocode}
%
% \begin{macro}{\l@nohyphenation}
% \changes{v2.0t}{2017/03/09}{ensure \cs{l@nohyphenation} is defined.}
% \begin{macrocode}
\ifx\l@nohyphenation \@undefined
\newlanguage\l@nohyphenation
\fi
% \end{macrocode}
% \end{macro}
%
%
% \begin{macro}{\document@default@language}
% Default document language. -1 acts as language 0, but used as a flag in |\document|
% to see if it has been set in the preamble.
% \changes{v2.1f}{2018/08/24}{Add to latexrelease (github/68)}
% \begin{macrocode}
%</2ekernel>
%<*2ekernel|latexrelease>
%<latexrelease>\IncludeInRelease{2017/04/15}%
%<latexrelease> {\document@default@language}{Save language for hyphenation}%
\let\document@default@language\m@ne
%</2ekernel|latexrelease>
%<latexrelease>\EndIncludeInRelease
%<latexrelease>\IncludeInRelease{0000/00/00}%
%<latexrelease> {\document@default@language}{Save language for hyphenation}%
%<latexrelease>\let\document@default@language\@undefined
%<latexrelease>\EndIncludeInRelease
%<*2ekernel>
% \end{macrocode}
% \end{macro}
%
%
%
% \subsection{Font loading}
% Fonts loaded during the formatting process might already have
% changed the |\font@submax| from |0pt| to something higher.
% If so, we put out a bold warning.
% \changes{v0.1l}{1994/05/20}{Use new font warning commands}
% \changes{v1.1c}{2000/08/23}{Fix typo in warning}
% \begin{macrocode}
\ifdim \font@submax >\z@
\@font@warning{Size substitutions with differences\MessageBreak
up to \font@submax\space have occurred.\MessageBreak
\MessageBreak
Please check the transcript file
carefully\MessageBreak
and redo the format generation if necessary!
\@gobbletwo}%
\errhelp{Only stopped, to give you time to
read the above message.}
\errmessage{}
% \end{macrocode}
% We reset the macro. Otherwise every user will get a warning on
% every job.
% \begin{macrocode}
\def\font@submax{0pt}
\fi
% \end{macrocode}
%
% \subsection{Input encoding}
%
% \changes{v2.1a}{2018/03/25}{default to UTF-8}
% Starting with the 2018 \LaTeX\ release default the inputencoding
% to UTF-8. Unless the format is being used with luatex, xetex, enctex or mltex.
%
% This is done in a way largely compatible with older releases: |utf8.def| is input just as if\\
% |\usepackage[utf8]{inputenc}|\\
% had been used, however rather than input the whole package a minimal core part just enough to support
% loading the UTF-8 encoding files is defined here.
%
% If a document re-specifies UTF-8 this is silently ignored.
%
% \begin{macrocode}
%</2ekernel>
%<*2ekernel|latexrelease>
% \end{macrocode}
%
% Check that a classic 8-bit tex engine is being used (LaTeX or PDFLaTeX).
%
% \begin{macrocode}
%<latexrelease>\IncludeInRelease{2018/04/01}%
%<latexrelease> {\UTFviii@invalid}{UTF-8 default}%
% \end{macrocode}
%
%
% Skip this section in Unicode TeX, or if MLTeX and EncTeX are enabled.
% \begin{macrocode}
\ifnum0%
\ifx\Umathcode\@undefined\else 1\fi
\ifx\mubyte\@undefined\else 1\fi
\ifx\charsubdef\@undefined\else 1\fi
=\z@
% \end{macrocode}
%
% \begin{macrocode}
\def\saved@space@catcode{10}
\let\@inpenc@test\relax
\def\IeC{%
\ifx\protect\@typeset@protect
\expandafter\@firstofone
\else
\noexpand\IeC
\fi
}
% \end{macrocode}
%
% Make characters active for UTF-8 input formats
% \begin{macrocode}
\@tempcnta=1
\loop
\catcode\@tempcnta=13 %
\advance\@tempcnta\@ne %
\ifnum\@tempcnta<32 %
\repeat %
\catcode0=15 % null
\catcode9=10 % tab
\catcode10=12 % ctrl J
\catcode12=13 % ctrl L
\catcode13=5 % newline
\@tempcnta=128
\loop
\catcode\@tempcnta=13
\advance\@tempcnta\@ne
\ifnum\@tempcnta<256
\repeat
% \end{macrocode}
%
% \begin{macro}{\UseRawInputEncoding}
% \changes{v2.1a}{2018/03/25}{Macro added}
% Reset 8 bit characters to catcode 12 so the input encoding matches the ``Raw''
% font encoding.
% Useful for special behaviours, or for compatibility with older \LaTeX\ formats.
% \changes{v2.1b}{2018/04/06}{Undo changes to \cs{DeclareFontEncoding@} and
% definition of \cs{DeclareUnicodeCharacter}}
% \changes{v2.1c}{2018/04/07}{Undefine \cs{inputencodingname}}
% \begin{macrocode}
\def\UseRawInputEncoding{%
\let\inputencodingname\@undefined % revert
\let\DeclareFontEncoding@\DeclareFontEncoding@saved % revert
\let\DeclareUnicodeCharacter\@undefined % revert
\@tempcnta=1
\loop
\catcode\@tempcnta=15 %
\advance\@tempcnta\@ne %
\ifnum\@tempcnta<32 %
\repeat %
\catcode0=15 % null
\catcode9=10 % tab
\catcode10=12 % ctrl J
\catcode12=13 % ctrl L
\catcode13=5 % newline
\@tempcnta=128
\loop
\catcode\@tempcnta=12
\advance\@tempcnta\@ne
\ifnum\@tempcnta<256
\repeat
}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\DeclareFontEncoding@saved}
% Saved version of |\DeclareFontEncoding@| before \texttt{utf8.def}
% modifies it for use in |\UseRawInputEncoding| above.
% \begin{macrocode}
\let\DeclareFontEncoding@saved\DeclareFontEncoding@
% \end{macrocode}
% \end{macro}
%
% \changes{v2.1d}{2018/04/08}{Delay full UTF-8 handling to \cs{everyjob}}
% \changes{v2.18}{2018/05/11}{Make invalid UTF-8 also safe, for legacy filesystem encodings}
% \begin{macrocode}
\edef\inputencodingname{utf8}%
\input{utf8.def}
\let\UTFviii@undefined@err@@\UTFviii@undefined@err
\let\UTFviii@invalid@err@@\UTFviii@invalid@err
\let\UTFviii@two@octets@@\UTFviii@two@octets
\let\UTFviii@three@octets@@\UTFviii@three@octets
\let\UTFviii@four@octets@@\UTFviii@four@octets
%<2ekernel>\def\UTFviii@undefined@err#1{\@gobble#1}%
%<2ekernel>\let\UTFviii@invalid@err\string
%<2ekernel>\let\UTFviii@two@octets\string
%<2ekernel>\let\UTFviii@three@octets\string
%<2ekernel>\let\UTFviii@four@octets\string
%<2ekernel>\everyjob\expandafter{\the\everyjob
%<2ekernel>\let\UTFviii@undefined@err\UTFviii@undefined@err@@
%<2ekernel>\let\UTFviii@invalid@err\UTFviii@invalid@err@@
%<2ekernel>\let\UTFviii@two@octets\UTFviii@two@octets@@
%<2ekernel>\let\UTFviii@three@octets\UTFviii@three@octets@@
%<2ekernel>\let\UTFviii@four@octets\UTFviii@four@octets@@
%<2ekernel>}
\let\@inpenc@test\@undefined
\let\saved@space@catcode\@undefined
% \end{macrocode}
%
% For formats not set up for UTF-8 default, set the C0 controls to catcode 15.
% \begin{macrocode}
\else
\@tempcnta=0
\loop
\catcode\@tempcnta=15 %
\advance\@tempcnta\@ne %
\ifnum\@tempcnta<32 %
\repeat %
\catcode0=15 % null
\catcode9=10 % tab
\catcode10=12 % ctrl J
\catcode12=13 % ctrl L
\catcode13=5 % newline
% \end{macrocode}
%
% \begin{macrocode}
\let\UseRawInputEncoding\relax
% \end{macrocode}
%
% This ends the skipped code in Unicode engines:
% \begin{macrocode}
\fi
%</2ekernel|latexrelease>
%<latexrelease>\EndIncludeInRelease
%<latexrelease>\IncludeInRelease{0000/00/00}%
%<latexrelease> {\UTFviii@invalid}{UTF-8 default}%
% \end{macrocode}
%
% The first block of commands got only introduced in 2019 but we
% revert all of Unicode support in one go not jump to the
% intermediate version.
% \begin{macrocode}
%<latexrelease> \let\UTFviii@two@octets@combine\@undefined
%<latexrelease> \let\UTFviii@three@octets@combine\@undefined
%<latexrelease> \let\UTFviii@four@octets@combine\@undefined
%<latexrelease> \let\UTFviii@two@octets@string\@undefined
%<latexrelease> \let\UTFviii@three@octets@string\@undefined
%<latexrelease> \let\UTFviii@four@octets@string\@undefined
%<latexrelease> \let\UTFviii@two@octets@noexpand\@undefined
%<latexrelease> \let\UTFviii@three@octets@noexpand\@undefined
%<latexrelease> \let\UTFviii@four@octets@noexpand\@undefined
% \end{macrocode}
%
% \begin{macrocode}
%<latexrelease>\@tempcnta=0
%<latexrelease>\loop
%<latexrelease> \catcode\@tempcnta=15
%<latexrelease> \advance\@tempcnta\@ne
%<latexrelease>\ifnum\@tempcnta<32
%<latexrelease>\repeat %
%<latexrelease>\catcode9=10 % tab
%<latexrelease>\catcode10=12 % ctrl J
%<latexrelease>\catcode12=13 % ctrl L
%<latexrelease>\catcode13=5 % newline
%<latexrelease>\@tempcnta=128
%<latexrelease>\loop
%<latexrelease>\catcode\@tempcnta=12
%<latexrelease>\advance\@tempcnta\@ne
%<latexrelease>\ifnum\@tempcnta<256
%<latexrelease>\repeat
%<latexrelease>\let\IeC\@undefined
%<latexrelease>\def\DeclareFontEncoding@#1#2#3{%
%<latexrelease> \expandafter
%<latexrelease> \ifx\csname T@#1\endcsname\relax
%<latexrelease> \def\cdp@elt{\noexpand\cdp@elt}%
%<latexrelease> \xdef\cdp@list{\cdp@list\cdp@elt{#1}%
%<latexrelease> {\default@family}{\default@series}%
%<latexrelease> {\default@shape}}%
%<latexrelease> \expandafter\let\csname#1-cmd\endcsname\@changed@cmd
%<latexrelease> \else
%<latexrelease> \@font@info{Redeclaring font encoding #1}%
%<latexrelease> \fi
%<latexrelease> \global\@namedef{T@#1}{#2}%
%<latexrelease> \global\@namedef{M@#1}{\default@M#3}%
%<latexrelease> \xdef\LastDeclaredEncoding{#1}%
%<latexrelease> }
%<latexrelease> \let\UseRawInputEncoding\@undefined
%<latexrelease> \let\DeclareFontEncoding@saved\@undefined
%<latexrelease> \let\inputencodingname\@undefined
%<latexrelease>\EndIncludeInRelease
% \end{macrocode}
%
% \begin{macrocode}
%<*2ekernel>
% \begin{macrocode}
%
% We temporarily define |\reserved@a| to apply |\reserved@c| to all the
% numbers in the range of its arguments.
% \begin{macrocode}
\def\reserved@a#1#2{%
\@tempcnta#1\relax
\@tempcntb#2\relax
\reserved@b
}
\def\reserved@b{%
\ifnum\@tempcnta>\@tempcntb\else
\reserved@c\@tempcnta
\advance\@tempcnta\@ne
\expandafter\reserved@b
\fi
}
% \end{macrocode}
% \changes{v0.1e}{1994/05/02}{Added setting the special catcodes.}
% \changes{v0.1f}{1994/05/02}{Set the catcode of control-J.}
% Set the special catcodes (although some of these are useless, since an
% error will have occurred if the catcodes have changed). Note that
% |^^J| has catcode `other' for use in warning messages.
% \begin{macrocode}
\catcode`\ =10
\catcode`\#=6
\catcode`\$=3
\catcode`\%=14
\catcode`\&=4
\catcode`\\=0
\catcode`\^=7
\catcode`\_=8
\catcode`\{=1
\catcode`\}=2
\catcode`\~=13
\catcode`\@=11
\catcode`\^^I=10
\catcode`\^^J=12
\catcode`\^^L=13
\catcode`\^^M=5
% \end{macrocode}
% \changes{v0.1e}{1994/05/02}{Added setting the `other' catcodes.}
% Set the `other' catcodes.
% \begin{macrocode}
\def\reserved@c#1{\catcode#1=12\relax}
\reserved@c{`\!}
\reserved@c{`\"}
\reserved@a{`\'}{`\?}
\reserved@c{`\[}
\reserved@c{`\]}
\reserved@c{`\`}
\reserved@c{`\|}
% \end{macrocode}
% \changes{v0.1e}{1994/05/02}{Added setting the `letter' catcodes.}
% Set the `letter' catcodes.
% \begin{macrocode}
\def\reserved@c#1{\catcode#1=11\relax}
\reserved@a{`\A}{`\Z}
\reserved@a{`\a}{`\z}
% \end{macrocode}
% \changes{v0.1e}{1994/05/02}{Made slot 127 illegal}
% \changes{v1.0n}{1994/11/18}
% {re-allow slots 127--255}
% All the characters in the range 0--31 and 127--255 are illegal,
% \emph{except} tab (|^^I|), nl (|^^J|), ff (|^^L|) and cr (|^^M|).
%
%
% \subsection{Lccodes and uccodes}
%
% \changes{v1.1b}{1998/05/20}{Set up uc/lccodes after loading
% hyphenation files: pr/2639}
% We now again set up the default (T1) uc/lccodes.
% The lower case characters need their |\uccode| and |\lccode| values
% set. Some of this is a repeat of the set-up before loading
% hyphenation files.
% Depending on the \TeX{} version, we might not be allowed to do
% this for non-ASCII characters.
% \changes{v1.0n}{1994/06/09}{For \TeX2, do not set codes for higher
% half of character table.}
% \changes{v2.0a}{2015/01/03}{Skip resetting codes with Unicode engines}
% For the Unicode engines (Xe\TeX{} and Lua\TeX{}) there is no need to
% do any of this: they use hyphenation data which does not alter any
% of the set up and so this entire block is skipped.
% \begin{macrocode}
\ifnum 0%
\ifx\Umathcode\@undefined\else 1\fi
\ifx\XeTeXmathcode\@undefined\else 1\fi
>\z@
\else
\def\reserved@c#1{%
\count@=#1\advance\count@ by -"20
\uccode#1=\count@
\lccode#1=#1
}
\reserved@a{`\a}{`\z}
\reserved@a{"A0}{"BC}
\reserved@a{"E0}{"FF}
% \end{macrocode}
% The upper case characters need their |\uccode| and |\lccode| values
% set, and their |\sfcode| set to 999.
% \begin{macrocode}
\def\reserved@c#1{%
\count@=#1\advance\count@ by "20
\uccode#1=#1
\lccode#1=\count@
\sfcode#1=999
}
\reserved@a{`\A}{`\Z}
\reserved@a{"80}{"9C}
\reserved@a{"C0}{"DF}
% \end{macrocode}
% Well, it would be nice if that were correct, but unfortunately, the
% Cork encoding contains some odd slots whose uccode or lccode isn't
% quite what you'd expect.
% \begin{macrocode}
\uccode`\^^Y=`\I % dotless i
\lccode`\^^Y=`\^^Y % dotless i
\uccode`\^^Z=`\J % dotless j, ae in OT1
\lccode`\^^Z=`\^^Z % dotless j, ae in OT1
\lccode`\^^9d=`\i % dotted I
\uccode`\^^9d=`\^^9d % dotted I
\lccode`\^^9e=`\^^9e % d-bar
\uccode`\^^9e=`\^^d0 % d-bar
% \end{macrocode}
% Finally here is one that helps hyphenation in the OT1 encoding.
% \changes{v1.0z}{1996/10/31}
% {Added extra \cs{lcode}, hoping it does no harm in T1 (pr/1969)}
% \begin{macrocode}
\lccode`\^^[=`\^^[ % oe in OT1
\fi % End of reset block for 8-bit engines
% \end{macrocode}
%
% \begin{macro}{\MakeUppercase}
% \begin{macro}{\MakeUppercase}
% \begin{macro}{\@uclclist}
%
% \changes{v1.1a}{1997/10/20}{Removed \cs{aa} and \cs{AA} from
% \cs{@uclclist} as these are macros.}
%
% And whilst we're doing things with uc/lc tables, here are two
% commands to upper- and lower-case a string.
%
% \emph{Note} that this implementation is subject to change! At
% the moment we're not providing any way to extend the list of
% uc/lc commands, since finding a good interface is difficult.
% These commands have some nasty features, such as uppercasing
% mathematics, environment names, labels, etc. A much better
% long-term solution is to use all-caps fonts, but these aren't
% generally available.
% \begin{macrocode}
\DeclareRobustCommand{\MakeUppercase}[1]{{%
\def\i{I}\def\j{J}%
\def\reserved@a##1##2{\let##1##2\reserved@a}%
\expandafter\reserved@a\@uclclist\reserved@b{\reserved@b\@gobble}%
% \end{macrocode}
% Tell UTF-8 processing to process chars even though we are in an \cs{protected@edef}.
% \changes{v2.1h}{2019/09/14}{Expand UTF8 chars when case changing (github/177)}
% \begin{macrocode}
\let\UTF@two@octets@noexpand\@empty
\let\UTF@three@octets@noexpand\@empty
\let\UTF@four@octets@noexpand\@empty
\protected@edef\reserved@a{\uppercase{#1}}%
\reserved@a
}}
\DeclareRobustCommand{\MakeLowercase}[1]{{%
\def\reserved@a##1##2{\let##2##1\reserved@a}%
\expandafter\reserved@a\@uclclist\reserved@b{\reserved@b\@gobble}%
\let\UTF@two@octets@noexpand\@empty
\let\UTF@three@octets@noexpand\@empty
\let\UTF@four@octets@noexpand\@empty
\protected@edef\reserved@a{\lowercase{#1}}%
\reserved@a
}}
% \end{macrocode}
%
% \begin{macrocode}
\def\@uclclist{\oe\OE\o\O\ae\AE
\dh\DH\dj\DJ\l\L\ng\NG\ss\SS\th\TH}
% \end{macrocode}
% The above code works, but has the nasty side-effect that if you
% say something like:
%\begin{verbatim}
% \markboth{\MakeUppercase\contentsname}
% {\MakeUppercase\contentsname}
%\end{verbatim}
% then the uppercasing is only done to the first letter of the
% contents name, since the mark expands out to:
%\begin{verbatim}
% \mark{\protect\MakeUppercase Table of Contents}
% {\protect\MakeUppercase Table of Contents}
%\end{verbatim}
% In order to get round this, we redefine |\MakeUppercase| and
% |\MakeLowercase| to grab their argument and brace it. This is a
% very low-level hack, and is \emph{not} recommended practice!
% This is an instance of a general problem that makes it unsafe to
% grab arguments unbraced, and probably needs a more general
% solution. For the moment though, this hack will do:
% \begin{macrocode}
\protected@edef\MakeUppercase#1{\MakeUppercase{#1}}
\protected@edef\MakeLowercase#1{\MakeLowercase{#1}}
% \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
%
% \changes{v1.0h}{1994/05/13}{Added output enc stuff}
% \changes{v1.0i}{1994/05/16}{moved output enc stuff to lfonts}
%
% \changes{v0.1a}{1994/03/07}{Add code from the old dump.dtx}
%
% \subsection{Applying Patch files}
% Between major releases, small patches will be distributed in