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ltfssbas.dtx
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ltfssbas.dtx
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% \iffalse meta-comment
%
% Copyright (C) 1993-2019
% 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: ltfssbas.dtx
%% Copyright (C) 1989-2002 Frank Mittelbach and Rainer Sch\"opf
%
%<*driver>
% \fi
%
%
\ProvidesFile{ltfssbas.dtx}
[2019/08/27 v3.2d LaTeX Kernel (NFSS Basic Macros)]
% \iffalse
\documentclass{ltxdoc}
\begin{document}
\DocInput{ltfssbas.dtx}
\end{document}
%</driver>
% \fi
%
% \iffalse
%<+checkmem>\def\CHECKMEM{\tracingstats=2
%<+checkmem> \newlinechar=`\^^J
%<+checkmem> \message{^^JMemory usage: \filename}\shipout\hbox{}}
%<+checkmem>\CHECKMEM
% \fi
%
%
%
% \GetFileInfo{ltfssbas.dtx}
% \title{A new font selection scheme for \TeX{} macro packages\\
% (Basic Macros)\thanks
% {This file has version number
% \fileversion\ dated \filedate}}
%
% \author{Frank Mittelbach \and Rainer Sch\"opf}
%
% \MaintainedByLaTeXTeam{latex}
% \maketitle
%
% This file contains the main implementation of the `low level' font
% selection commands. See other parts of the \LaTeX\
% distribution, or \emph{The \LaTeX\ Companion} for higher level
% documentation of the \LaTeX\ `New' Font Selection Scheme.
%
% \begin{quote}
% \textbf{Warning:}
% The macro documentation is still basically the documentation from the
% first NFSS release and therefore in some cases probably not
% completely accurate.
% \end{quote}
%
% \StopEventually{}
%
% \changes{v3.0v}{1998/08/17}{(RmS) Documentation fixes.}
% \changes{v3.0j}{1995/10/22}{(RmS) New size function macro
% \cs{genb@sfcnt} needs to be disabled at \cs{document}.}
% \changes{v3.0i}{1995/10/20}
% {(DPC) Modify autoload code, change \cs{undefined}}
% \changes{v3.0g}{1995/10/04}{Modify autoload code}
% \changes{v3.0f}{1995/08/24}{Added autoload code}
% \changes{v3.0d}{1995/07/13}
% {minor documentation changes}
% \changes{v3.0c}{1995/06/15}
% {(DPC) minor documentation changes}
% \changes{v3.0a}{1995/05/24}
% {(DPC) Make file from previous file, fam.dtx 1995/05/20 v2.2d}
%
%
% \changes{v2.1x}{1994/11/18}{(DPC) use \cs{reserved@f} not \cs{next}}
% \changes{v2.1q}{1994/05/20}{Use new error commands}
% \changes{v2.1o}{1994/05/15}{encoding cmds changed to {enc}-cmd}
% \changes{v2.1k}{1994/05/13}{Remove File identification `typeout'}
% \changes{v2.1j}{1994/05/12}{New baselinestretch concept}
% \changes{v2.1j}{1994/05/12}{Replaced hand-protected commands by
% \cs{DeclareRobustCommand} defs}
% \changes{v2.1h}{1994/04/11}{Added \cs{defaultscriptratio} and
% \cs{defaultscriptscriptratio}. ASAJ.}
% \changes{v2.1g}{1994/03/13}{add 2ekernel module to omit repeated code}
% \changes{v2.1a}{1994/01/17}{New math font setup}
% \changes{v2.0c}{1993/03/18}{Changed all \cs{@tempdima} in
% \cs{@tempdimb} to avoid killing \cs{numberline}}
% \changes{v1.91a}{1992/09/22}{Introduced \cs{tf@size} for math size.}
% \changes{v1.3a}{1991/11/27}{All \cs{family}, \cs{shape} etc.
% renamed to \cs{fontfamily} etc.}
% \changes{v1.2i}{1990/04/01}{Code added from tracefnt.dtx.}
% \changes{v1.2i}{1990/04/01}{Support for TeX3.}
% \changes{v1.2g}{1990/02/16}{Support for changes of \cs{baselineskip}
% without changing the size.}
%
% \changes{v1.2c}{1990/01/23}{\cs{no@version@warning} renamed to
% \cs{no@alphabet@error}.}
% \changes{v1.0s}{1989/11/25}{All \cs{edef}\cs{font@name} changed to
% \cs{xdef}\cs{font@name}.
% Necessary after introduction of
% \cs{begingroup}/\cs{endgroup} in v1.0q.}
% \changes{v1.0s}{1989/11/25}{extra// $\to$ + in \cs{extra@def}.}
% \changes{v1.0o}{1989/11/08}{First parameter of
% \cs{define@mathalphabet}
% and \cs{define@mathgroup} changed
% from string to control sequence.}
% \changes{v1.0m}{1989/09/14}
% {Global replacement: \cs{group} to \cs{mathgroup}}
% \changes{v1.0k}{1989/05/22}{Lines longer than 72 characters folded.}
% \changes{v1.0j}{1989/05/01}{Default for \cs{baselinestretch} added.}
% \changes{v1.0i}{1989/04/29}
% {Removed the \cs{halign} \cs{noalign} correction
% (wasn't bugfree)}
% \changes{v1.0h}{1989/04/29}{Documented problem with \cs{halign}, and
% \cs{noalign}}
% \changes{v1.0g}{1989/04/27}{Documentation revised.}
% \changes{v1.0f}{1989/04/23}{\% in \cs{getanddefinefonts} added.}
% \changes{v1.0e}{1989/04/21}{Documentation is fun!!
% Parameters of \cs{define@mathalphabet} changed.}
% \changes{v1.0d}{1989/04/19}{Even more doc.}
% \changes{v1.0c}{1989/04/14}{More documentation added.}
% \changes{v1.0b}{1989/04/10}{\cs{preload@sizes} added.}
% \changes{v1.0b}{1989/04/10}{\cs{wrong@fontshape} changed to define
% substitution font/shape macro.}
% \changes{v1.0a}{1989/04/10}{Starting with version numbers!!
% \cs{ifmmode} added in \cs{math@group}}
% \changes{v2.1w}{1994/11/17}{\cs{@tempa} to \cs{reserved@a}}
% \changes{v3.0z}{2015/02/21}{Removed autoload code}
% \changes{v3.2d}{2019/08/27}{Make various commands robust}
%
%
%
%
% \section{Preliminary macros}
%
% We define a number
% of macros that will be used later.
%
%
% \begin{macro}{\@nomath}
% |\@nomath| is used by most macros that will have no effect
% in math mode. It issues a warning message.
% \begin{macrocode}
%<*2ekernel>
\def\@nomath#1{\relax\ifmmode
\@font@warning{Command \noexpand#1invalid in math mode}\fi}
% \end{macrocode}
% \end{macro}
%
% \changes{v1.2c}{1990/01/23}{Macro \cs{no@alphabet@help} added}
% \changes{v2.1i}{1994/04/18}{Macro \cs{no@alphabet@help}
% removed again}
%
% \begin{macro}{\no@alphabet@error}
% \changes{v1.2c}{1990/01/23}{Changed to error call}
% \changes{v2.1i}{1994/04/18}{Use std LaTeX error macro}
% The macro |\no@alphabet@error| is called whenever
% the user requests a math \emph{alphabet} that is not
% available in the current \emph{version}.
% In math mode an error message is produced otherwise the command
% keeps silent.
% The argument is the name of the control sequence that identifies
% the math \emph{alphabet}.
% The |\relax| at the beginning is necessary to prevent
% \TeX{} from scanning too far in certain situations.
% \begin{macrocode}
\gdef\no@alphabet@error#1{\relax \ifmmode
\@latex@error{Math\space alphabet\space identifier\space
\noexpand#1is\space undefined\space in\space math\space
version\space `\math@version'}%
{Your\space requested\space math\space alphabet\space
is\space undefined\space in\space the\space current\space
math\space version.^^JCheck\space the\space spelling\space
or\space use\space the\space \noexpand\SetMathAlphabet\space
command.}
\fi}
% \end{macrocode}
% \end{macro}
%
%
% \begin{macro}{\new@mathgroup}
% \begin{macro}{\mathgroup}
% We also give a new name to |\newfam| and |\fam|
% to avoid verbal confusion
% (see the introduction).\footnote{For the same reason
% it seems advisable to
% {\ttfamily\bslash let\bslash fam} and
% {\ttfamily\bslash newfam}
% equal to {\ttfamily\bslash relax},
% but this is commented out to retain
% compatibility to existing style files.}
% \changes{v1.2e}{1990/01/28}{\cs{newfam} let to \cs{new@mathgroup}.}
% \changes{v3.0a}{1995/05/24}
% {(DPC) No need to redefine \cs{newfam} as not outer}
% \changes{v3.0b}{1995/05/27}
% {(FMi) But a need to define \cs{new@mathgroup}}
% \changes{v3.0y}{2014/12/30}
% {move allocation to ltplain.}
% \begin{macrocode}
%\def\new@mathgroup{\alloc@8\mathgroup\chardef\sixt@@n}
\let\mathgroup\fam
%\let\newfam\new@mathgroup
\@onlypreamble\new@mathgroup
% \end{macrocode}
% \end{macro}
% \end{macro}
%
%
% \section{Macros for setting up the tables}
%
% \begin{macro}{\DeclareFontShape}
%
% \changes{v1.9a}{1992/07/26}{Introduced \cs{DeclareFontShape}}
% The macro |\DeclareFontShape| takes $6$ arguments:
% \begin{macrocode}
\def\DeclareFontShape{\begingroup
% \end{macrocode}
% First we restore the catcodes of all characters used in the syntax.
% \changes{v2.1e}{1994/02/24}
% {Separate restoration of catcodes for fd cmds}
% \begin{macrocode}
\nfss@catcodes
% \end{macrocode}
% We use |\expandafter| |\endgroup| to restore catcode in case
% something goes wrong with the argument parsing (suggested by Tim
% Van Zandt)
% \end{macro}
%
%
%
% \begin{macro}{\DeclareFontShape}
% \changes{v2.1c}{1994/02/07}{revert catcode settings earlier}
% \changes{v3.0m}{1995/11/01}
% {(DPC) Test for \cs{relax} not \cs{undefined}, internal/1933}
% \begin{macrocode}
\expandafter\endgroup
\DeclareFontShape@}
\def\DeclareFontShape@#1#2#3#4#5#6{%
\expandafter\ifx\csname #1+#2\endcsname\relax
\@latex@error{Font family `#1+#2' unknown}\@eha
\else
\expandafter
\xdef\csname#1/#2/#3/#4\endcsname{\expandafter\noexpand
\csname #5\endcsname}%
\def\reserved@a{#6}%
\global
\expandafter\let\csname#5\expandafter\endcsname
\ifx\reserved@a\@empty
\@empty
\else
\reserved@a
\fi
\fi
}
% \end{macrocode}
% \end{macro}
%
%
% \begin{macro}{\DeclareFixedFont}
% Define a direct font switch that avoids all overhead.
% \changes{v2.1u}{1994/11/06}{Renamed
% \cs{every@size} to \cs{every@math@size}.}
% \begin{macrocode}
\def\DeclareFixedFont#1#2#3#4#5#6{%
\begingroup
\math@fontsfalse
\every@math@size{}%
\fontsize{#6}\z@
\usefont{#2}{#3}{#4}{#5}%
\global\expandafter\let\expandafter#1\the\font
\endgroup
}
% \end{macrocode}
% \end{macro}
%
%
%
%
% \begin{macro}{\do@subst@correction}
%
% \begin{macrocode}
\def\do@subst@correction{%
\xdef\subst@correction{%
\font@name
\global\expandafter\font
\csname \curr@fontshape/\f@size\endcsname
\noexpand\fontname\font
\relax}%
% \end{macrocode}
% Calling |\subst@correction| after the current group means calling
% it after we have loaded the substitution font which is done
% inside a group.
% \begin{macrocode}
\aftergroup\subst@correction
}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\DeclareFontFamily}
% \begin{macrocode}
\def\DeclareFontFamily#1#2#3{%
% \end{macrocode}
% If we want fast checking for the encoding scheme we can just
% check for |\T@..| being defined.
% \begin{macrocode}
% \@tempswafalse
% \def\reserved@b{#1}%
% \def\cdp@elt##1##2##3##4{\def\reserved@c{##1}%
% \ifx\reserved@b\reserved@c \@tempswatrue\fi}%
% \cdp@list
% \if@tempswa
\@ifundefined{T@#1}%
{%
\@latex@error{Encoding scheme `#1' unknown}\@eha
}%
{%
% \end{macrocode}
% Now we have to define the macro |\|\meta{\#1}|+|\meta{\#2}
% to contain |#3|. But since most of the time |#3| will be empty
% we use |\let| in a tricky way rather than a simple |\def| since
% this will save internal memory.
% We store the argument |#3| in a temporary macro
% |\reserved@a|.
% \begin{macrocode}
\def\reserved@a{#3}%
% \end{macrocode}
% We compare |\reserved@a| with |\@empty|
% If these two are the same we |\let| the `extra'
% macro equal to |\@empty| which is not the same a doing a |\let|
% to |\reserved@a| --- the latter would blow one extra memory
% location rather then reusing the one from |\@empty|.
% \begin{macrocode}
\global
\expandafter\let\csname #1+#2\expandafter\endcsname
\ifx \reserved@a\@empty
\@empty
\else \reserved@a
\fi
}%
}
% \end{macrocode}
% \end{macro}
%
%
% \begin{macro}{\cdp@list}
% We initialize the code page list to be empty.
% \begin{macrocode}
\let\cdp@list\@empty
\@onlypreamble\cdp@list
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\cdp@elt}
% \begin{macrocode}
\let\cdp@elt\relax
\@onlypreamble\cdp@elt
% \end{macrocode}
% \end{macro}
%
%
%
%
% \begin{macro}{\DeclareFontEncoding}
% \begin{macrocode}
\def\DeclareFontEncoding{%
% \end{macrocode}
% First we start with ignoring all blanks and newlines since every
% surplus space in the second or third argument will come out in
% a weird place in the document.
% \changes{v2.1c}{1994/02/07}{revert catcode settings earlier}
% \changes{v2.1t}{1994/10/19}{Add missing \cs{relax}.}
% \changes{v2.1z}{1994/12/06}{use \cs{nfss@catcodes}}
% \begin{macrocode}
\begingroup
\nfss@catcodes
\expandafter\endgroup
\DeclareFontEncoding@}
\@onlypreamble\DeclareFontEncoding
% \end{macrocode}
% \changes{v2.0g}{1993/09/15}
% {Corrected: \cs{default@T} to \cs{default@M}.}
% \begin{macrocode}
\def\DeclareFontEncoding@#1#2#3{%
\expandafter
\ifx\csname T@#1\endcsname\relax
\def\cdp@elt{\noexpand\cdp@elt}%
\xdef\cdp@list{\cdp@list\cdp@elt{#1}%
{\default@family}{\default@series}%
{\default@shape}}%
% \end{macrocode}
% To support encoding dependent commands (like accents) we
% initialise the command
% |\|\meta{encoding}|-cmd| to be |\@changed@cmd|.
% (See \texttt{ltoutenc.dtx} for details.)
% \changes{v2.1l}{1994/05/13}{Init encoding change command}
% \changes{v2.1n}{1994/05/14}{Only init enc change cmd when
% new encoding}
% \changes{v2.1n}{1994/05/14}{Log if encoding is redeclared}
% \begin{macrocode}
\expandafter\let\csname#1-cmd\endcsname\@changed@cmd
\else
\@font@info{Redeclaring font encoding #1}%
\fi
% \end{macrocode}
%
% \begin{macrocode}
\global\@namedef{T@#1}{#2}%
\global\@namedef{M@#1}{\default@M#3}%
% \end{macrocode}
% Keep a record of the last encoding being declared:
% \changes{v3.0w}{1999/01/06}{Added \cs{LastDeclaredEncoding} to
% support cyrillic integration (pr/2988)}
% \begin{macrocode}
\xdef\LastDeclaredEncoding{#1}%
}
\@onlypreamble\DeclareFontEncoding@
% \end{macrocode}
% \end{macro}
%
%
% \begin{macro}{\LastDeclaredEncoding}
% \changes{v3.0w}{1999/01/06}{Added \cs{LastDeclaredEncoding} to
% support cyrillic integration (pr/2988)}
% The last encoding being declared by |\DeclareFontEncoding|.
% \begin{macrocode}
\def\LastDeclaredEncoding{}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\DeclareFontSubstitution}
% \begin{macrocode}
\def\DeclareFontSubstitution#1#2#3#4{%
\expandafter
\ifx\csname T@#1\endcsname\relax
\@latex@error{Encoding scheme `#1' unknown}\@eha
\else
\begingroup
% \end{macrocode}
% \changes{v3.0x}{2002/10/02}{Adding \cs{LastDeclaredEncoding}
% introduced a bug as on some occasions that macro name was stored
% in the internal lists instead of the actual encoding. (pr/3459)}
% We loop through the |\cdp@list| and rebuild it anew in |\toks@|
% thereby replacing the defaults for the encoding in question with
% the new defaults. It is important to store the encoding to test
% against expanded in |\reserved@a| since it might just be
% |\LastDeclaredEncoding| that is passed as |#1|.
% \begin{macrocode}
\edef\reserved@a{#1}%
\toks@{}%
\def\cdp@elt##1##2##3##4{%
\def\reserved@b{##1}%
\ifx\reserved@a\reserved@b
% \end{macrocode}
% Here we use the new defaults but we use |##1| (i.e., the encoding
% name already stored previously) since we know that it is expanded.
% \begin{macrocode}
\addto@hook\toks@{\cdp@elt{##1}{#2}{#3}{#4}}%
\else
% \end{macrocode}
% If |\reserved@a| and |\reserved@b| differ then we simply copy
% from the old list to the new.
% \begin{macrocode}
\addto@hook\toks@{\cdp@elt{##1}{##2}{##3}{##4}}%
\fi}%
\cdp@list
\xdef\cdp@list{\the\toks@}%
\endgroup
\global
\@namedef{D@#1}{%
\def\default@family{#2}%
\def\default@series{#3}%
\def\default@shape{#4}%
}%
\fi
}
\@onlypreamble\DeclareFontSubstitution
% \end{macrocode}
% \end{macro}
%
%
% \begin{macro}{\DeclareFontEncodingDefaults}
% \begin{macrocode}
\def\DeclareFontEncodingDefaults#1#2{%
\ifx\relax#1\else
\ifx\default@T\@empty\else
\@font@info{Overwriting encoding scheme text defaults}%
\fi
\gdef\default@T{#1}%
\fi
\ifx\relax#2\else
\ifx\default@M\@empty\else
\@font@info{Overwriting encoding scheme math defaults}%
\fi
\gdef\default@M{#2}%
\fi
}
\@onlypreamble\DeclareFontEncodingDefaults
% \end{macrocode}
% \end{macro}
%
%
% \begin{macro}{\default@T}
% \begin{macro}{\default@M}
% \begin{macrocode}
\let\default@T\@empty
\let\default@M\@empty
% \end{macrocode}
% \end{macro}
% \end{macro}
%
%
% \begin{macro}{\DeclarePreloadSizes}
% \begin{macrocode}
\def\DeclarePreloadSizes#1#2#3#4#5{%
\@ifundefined{T@#1}%
{\@latex@error{Encoding scheme `#1' unknown}\@eha}%
{%
% \end{macrocode}
% Don't know at the moment what this group here does!
% \begin{macrocode}
\begingroup
% \end{macrocode}
% We define a macro |\reserved@f|\footnote{We cannot use
% {\ttfamily\bslash @tempa}
% since it is needed in
% {\ttfamily\bslash pickup@font}.}
% that grabs the next \emph{size} and loads the corresponding
% font.
% This is done by delimiting |\reserved@f|'s only argument by the
% \textsf{token} |,| (comma).
% \begin{macrocode}
\def\reserved@f##1,{%
% \end{macrocode}
% The end of the list will be detected when there are no more
% elements, i.e.\ when |\reserved@f|'s argument is empty.
% The trick used here is explained in Appendix~D of the
% \TeX{}book: if the argument is empty the |\if|
% will select the first clause and |\let| |\reserved@f|
% equal to |\relax|.
% (We use the |>| character here since it cannot appear
% in font file names.)
% \changes{v1.2j}{1990/06/24}{Missing percent added.}
% \begin{macrocode}
\if>##1>%
\let\reserved@f\relax
\else
% \end{macrocode}
% Otherwise, we define |\font@name| appropriately and
% call |\pickup@font| to do the work.
% Note that the requested |\curr@fontshape|
% combination must have been defined, or you will get an error.
% The definition of |\font@name| is carried out globally
% to be consistent with the rest of the code in this file.
% \begin{macrocode}
\xdef\font@name{\csname#1/#2/#3/#4/##1\endcsname}%
\pickup@font
% \end{macrocode}
% Now we forget the name of the font just loaded.
% More precisely, we set the corresponding control sequence
% to |\relax|. This means that later on, when the font
% is first used, the macro |\define@newfont| is called
% again to execute the `extra' macro for this font.
% \changes{v1.2d}{1990/01/27}{Font identifier set to \cs{relax}.}
% \begin{macrocode}
\global\expandafter\let\font@name\relax
\fi
% \end{macrocode}
% Finally we call |\reserved@f| again to process the next
% \emph{size}. If |\reserved@f| was |\let| equal to |\relax|
% this will end the macro.
% \begin{macrocode}
\reserved@f}%
% \end{macrocode}
% We finish with reinserting the list of sizes after the
% |\reserved@f|
% macro and appending an empty element so that the end of the list
% is recognized properly.
% \begin{macrocode}
\reserved@f#5,,%
\endgroup
}%
}
\@onlypreamble\DeclarePreloadSizes
% \end{macrocode}
% \end{macro}
%
%
%
% \begin{macro}{\ifmath@fonts}
% We need a switch to decide if we have to switch math fonts.
% For this purpose we provide |\ifmath@fonts|
% that can be set to true or false by the |\S@...| macros
% depending on if math fonts
% are provided for this size or not.
% The default is of course to switch all fonts.
% \begin{macrocode}
\newif\ifmath@fonts \math@fontstrue
% \end{macrocode}
% \end{macro}
%
%
%
% \begin{macro}{\DeclareMathSizes}
% \begin{macro}{\DeclareMathSizes*}
% |\DeclareMathSizes| takes the text size, math text size, math
% script size, and math scriptscript size as arguments and defines
% the right |\S@|\dots{} macro.
%
% \begin{macrocode}
\def\DeclareMathSizes{%
\@ifstar{\@DeclareMathSizes\math@fontsfalse}%
{\@DeclareMathSizes{}}}
\@onlypreamble\DeclareMathSizes
% \end{macrocode}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\@DeclareMathSizes}
% \changes{v3.0p}{1996/07/26}{use faster \cs{if} test}
% This modification by Michael J. Downes on comp.text.tex on 2002/10/17
% allows the user to have settings such as\\
% |\DeclareMathSizes{9.5dd}{9.5dd}{7.4dd}{6.6dd}|.
% \changes{v3.0y}{2015/01/11}{Allow arbitrary units (latexrelease)}
% \begin{macrocode}
%</2ekernel>
%<latexrelease>\IncludeInRelease{2015/01/01}{\@DeclareMathSizes}%
%<latexrelease> {Arbitrary units in \DeclareMathSizes}%
%<*2ekernel|latexrelease>
\def\@DeclareMathSizes #1#2#3#4#5{%
\@defaultunits\dimen@ #2pt\relax\@nnil
\if $#3$%
\expandafter\let\csname S@\strip@pt\dimen@\endcsname\math@fontsfalse
\else
\@defaultunits\dimen@ii #3pt\relax\@nnil
\@defaultunits\@tempdima #4pt\relax\@nnil
\@defaultunits\@tempdimb #5pt\relax\@nnil
\toks@{#1}%
\expandafter\xdef\csname S@\strip@pt\dimen@\endcsname{%
\gdef\noexpand\tf@size{\strip@pt\dimen@ii}%
\gdef\noexpand\sf@size{\strip@pt\@tempdima}%
\gdef\noexpand\ssf@size{\strip@pt\@tempdimb}%
\the\toks@
}%
\fi
}%
%</2ekernel|latexrelease>
%<latexrelease>\EndIncludeInRelease
%<latexrelease>\IncludeInRelease{0000/00/00}{\@DeclareMathSizes}%
%<latexrelease> {Arbitrary units in \DeclareMathSizes}%
%<latexrelease>\def\@DeclareMathSizes#1#2#3#4#5{%
%<latexrelease> \@defaultunits\dimen@#2pt\relax\@nnil
%<latexrelease> \if$#3$%
%<latexrelease> \expandafter \let
%<latexrelease> \csname S@\strip@pt\dimen@\endcsname
%<latexrelease> \math@fontsfalse
%<latexrelease> \else
%<latexrelease> \expandafter \gdef
%<latexrelease> \csname S@\strip@pt\dimen@\endcsname
%<latexrelease> {\gdef\tf@size{#3}\gdef\sf@size{#4}%
%<latexrelease> \gdef\ssf@size{#5}%
%<latexrelease> #1%
%<latexrelease> }%
%<latexrelease> \fi}%
%<latexrelease>\EndIncludeInRelease
%<*2ekernel>
% \end{macrocode}
%
% \begin{macrocode}
\@onlypreamble\@DeclareMathSizes
% \end{macrocode}
% \end{macro}
%
%
%
% \section{Selecting a new font}
%
% \subsection{Macros for the user}
%
%
% \begin{macro}{\fontencoding}
% \changes{v2.1j}{1994/05/12}{Use \cs{DeclareRobustCommand}.}
% \begin{macro}{\f@encoding}
% As we said in the introduction a font is described by four parameters.
% We first define macros to specify the wanted \emph{family},
% \emph{series}, or \emph{shape}.
% These are simply recorded in internal macros
% |\f@family|, |\f@series|, and |\f@shape|, resp.
% We use |\edef|'s so that the arguments can also be macros.
% \begin{macrocode}
\DeclareRobustCommand\fontencoding[1]{%
\expandafter\ifx\csname T@#1\endcsname\relax
\@latex@error{Encoding scheme `#1' unknown}\@eha
\else
\edef\f@encoding{#1}%
\ifx\cf@encoding\f@encoding
% \end{macrocode}
% If the new encoding is the same as the old
% encoding we have nothing to do.
% However, in case we had a sequence of several encoding changes
% without a |\selectfont| in-between we can save processing by
% making sure that |\enc@update| is |\relax|.
% \begin{macrocode}
\let\enc@update\relax
\else
% \end{macrocode}
% If current and new encoding differ we define the macro
% |\enc@update|
% to contain all updates necessary at |\selectfont| time.
% \begin{macrocode}
\let\enc@update\@@enc@update
\fi
\fi
}
% \end{macrocode}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\@@enc@update}
% \begin{macrocode}
\def\@@enc@update{%
% \end{macrocode}
% When |\@@enc@update| is executed |\f@encoding| holds the encoding
% name
% for the new encoding and |\cf@encoding| the name of the last active
% encoding.
%
% We start by setting the init command for encoding dependent
% macros to |\@changed@cmd|.
% \begin{macrocode}
\expandafter
\let
\csname\cf@encoding -cmd\endcsname
\@changed@cmd
% \end{macrocode}
% Then we turn the one for the new encoding to |\@current@cmd| (see
% \texttt{ltoutenc.dtx} for further explanations).
% \begin{macrocode}
\expandafter
\let
\csname\f@encoding-cmd\endcsname
\@current@cmd
% \end{macrocode}
% We execute the default settings |\default@T|, followed by the one
% for the new encoding.
% \begin{macrocode}
\default@T
\csname T@\f@encoding\endcsname
% \end{macrocode}
% Finally we change the default substitution values, disable
% |\enc@update| and make |\f@encoding| officially the current
% encoding.
% \begin{macrocode}
\csname D@\f@encoding\endcsname
\let\enc@update\relax
\let\cf@encoding\f@encoding
}
% \end{macrocode}
% \end{macro}
%
%
% \begin{macro}{\enc@update}
% \changes{v2.1m}{1994/05/14}{Macro added}
% The default action in |\selectfont| is to do nothing.
% \begin{macrocode}
\let\enc@update\relax
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\fontfamily}
% \changes{v2.1j}{1994/05/12}{Use \cs{DeclareRobustCommand}.}
% \begin{macro}{\f@family}
% \begin{macro}{\fontseries}
% \changes{v2.1j}{1994/05/12}{Use \cs{DeclareRobustCommand}.}
% \begin{macro}{\f@series}
% \begin{macro}{\fontshape}
% \changes{v2.1j}{1994/05/12}{Use \cs{DeclareRobustCommand}.}
% \changes{v2.1y}{1994/11/30}{Use \cs{@current@cmd} in
% \cs{@@enc@update}. ASAJ.}
% \begin{macro}{\f@shape}
% \begin{macrocode}
\DeclareRobustCommand\fontfamily[1]{\edef\f@family{#1}}
\DeclareRobustCommand\fontseries[1]{\edef\f@series{#1}}
\DeclareRobustCommand\fontshape [1]{\edef\f@shape{#1}}
% \end{macrocode}
% Some handy abbreviation if you want to get some particular font
% in the current size. If also the size should change one has to
% issue a |\fontsize| command first.
% \begin{macrocode}
\DeclareRobustCommand\usefont[4]{\fontencoding{#1}\fontfamily{#2}%
\fontseries{#3}\fontshape{#4}\selectfont
\ignorespaces}
% \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
%
%
% \begin{macro}{\linespread}
% \changes{v2.1j}{1994/05/12}{New macro}
% \changes{v2.1p}{1994/05/16}{Remove surplus braces}
% The command |\linespread| changes the current |\baselinestretch|
% by calling |\set@fontsize|. The values for |\f@size| and
% |\f@baselineskip| will be left unchanged.
% \begin{macrocode}
\DeclareRobustCommand\linespread[1]
{\set@fontsize{#1}\f@size\f@baselineskip}
% \end{macrocode}
% \end{macro}
%
%
% \begin{macro}{\fontsize}
% \changes{v2.1j}{1994/05/12}{Redefined to use \cs{set@fontsize}}
% \changes{v2.1p}{1994/05/16}{Pass \cs{baselinstretch} not
% \cs{f@linespread}}
% We also define a macro that allows to specify a size. In this
% case, however, we also need the value of |\baselineskip|. As the
% first argument to |\set@fontsize| we pass the current value of
% |\baselinestretch|. This will either match the internal value (in
% which case nothing changes, or it will be an updated value due to
% a user change of that macro using |\renewcommand|. If we would
% pass the internal |\f@linespread| such a change would be
% effectively overwritten by a size change.
% \begin{macrocode}
\DeclareRobustCommand\fontsize[2]
{\set@fontsize\baselinestretch{#1}{#2}}
% \end{macrocode}
% \end{macro}
%
%
% \changes{v2.1n}{1994/05/14}{Set defaults for all \cs{f@...}}
%
% \begin{macro}{\f@linespread}
% \changes{v2.1j}{1994/05/12}{New macro}
% This macro holds the current internal value for
% |\baselinestretch|.
% \begin{macrocode}
\let\f@family\@empty
\let\f@series\@empty
\let\f@shape\@empty
\let\f@size\@empty
\let\f@baselineskip\@empty
\let\f@linespread\@empty
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\cf@encoding}
% \changes{v2.1u}{1994/11/06}{New macro}
% \begin{macrocode}
\let\f@encoding\@empty
\let\cf@encoding\@empty
% \end{macrocode}
% \end{macro}
%
%
%
% \begin{macro}{\@defaultunits}
%
% The function |\@defaultunits| when wrapped around a dimen or skip
% assignment supplies default units. Usage:
%
% |\@defaultunits\dimen@=#1pt\relax\@nnil|
%
% Note: the |\relax| is *important*. Other units can be substituted
% for the `pt' if desired.
%
% We use |\remove@to@nnil| as an auxiliary macros for
% |\@defaultunits|. It just has to gobble the supplied default unit
% `pt' or whatever, if it wasn't used in the assignment.
% \begin{macrocode}
\def\@defaultunits{\afterassignment\remove@to@nnil}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\strip@pt}
% \begin{macro}{\rem@pt}
% This macro strips the characters |pt| produced by using |\the|
% on a dimen register.
% \begin{macrocode}
\begingroup
\catcode`P=12
\catcode`T=12
\lowercase{
\def\x{\def\rem@pt##1.##2PT{##1\ifnum##2>\z@.##2\fi}}}
\expandafter\endgroup\x
\def\strip@pt{\expandafter\rem@pt\the}
% \end{macrocode}
% \end{macro}
% \end{macro}
%
%
% \begin{macro}{\mathversion}
% \changes{v1.0h}{1989/04/29}{Test if version defined added.}
% \changes{v1.0m}{1989/09/14}
% {Corrected typo: \cs{endscname} to \cs{endcsname}.}
% \changes{v2.1j}{1994/05/12}{Use \cs{DeclareRobustCommand}.}
% \begin{macro}{\math@version}
% |\mathversion| takes the math \emph{version} name as
% argument, defines |\math@version| appropriately and switches
% to the font selected
% forcing a call to |\glb@settings| if the \emph{version} is
% known to the system.
% \changes{v1.0p}{1989/11/14}{Math version prefix `mv@' added.}
% \changes{v1.0r}{1989/11/22}
% {\cs{def} $\to$ \cs{edef} for \cs{math@version}.}
% \changes{v1.2g}{1990/02/16}{\cs{@nomath} added.}
% \changes{v2.1a}{1994/01/17}{New math font setup}
% \begin{macrocode}
\DeclareRobustCommand\mathversion[1]
{\@nomath\mathversion
\expandafter\ifx\csname mv@#1\endcsname\relax
\@latex@error{Math version `#1' is not defined}\@eha\else
\edef\math@version{#1}%
% \end{macrocode}
% We need to force a math font setup both now and at the point
% where we return to the previous math version.
% Forcing a math font setup can simply be done by setting
% |\glb@currsize| to an invalid value since this will trigger the
% setup when the formula starts.
% \begin{macrocode}
\gdef\glb@currsize{}%
% \end{macrocode}
% When the scope of the current |\mathversion| ends we need to
% restore the old setup. However this time we need to force it
% directly at least if we are inside math, otherwise we could wait.
% Another way to enhance this code here is todo the setting only if
% the version really has changed after all. This might be
% interesting in case of \texttt{amstext} and \texttt{boldsymbol}.
% \changes{v2.1b}{1994/01/25}{Corrections for math setup}
% \begin{macrocode}
\aftergroup\glb@settings
\fi}
% \end{macrocode}
% \end{macro}
% \end{macro}
%
%
% If \TeX{} would support a hook just before the end of a formula
% (opposite of |\everymath| so to speak) the implementation of the
% algorithm would be much simpler because in that case we would set up
% the correct math fonts at this point without having to worry about
% incorrect settings due to nesting. The same would be true if in
% \LaTeX{} the use of |$| (as the primitive \TeX{} command) would be
% impossible and instead only a higher-level interface would be
% available. Note that this does not mean that a |$| couldn't be the
% short-hand for starting and stopping that higher-level interface, it
% only means that the direct \TeX{} function must be hidden.
%
% Anyway, since we don't have this and won't have it in \LaTeXe{} we
% need to implement it in a somewhat slower way.
%
%
% We test for the current math font setup on entry of a formula,
% i.e., on the
% hooks |\everymath| and |\everydisplay|. But since these hooks may
% contain user data we provide ourselves with an internal version of
% these hooks which stays frozen.
%
%
% \begin{macro}{\frozen@everymath}
% \changes{v2.1a}{1994/01/17}{New math font setup}
% \begin{macro}{\frozen@everydisplay}
% New internal names for |\everymath| and |\everydisplay|.
% \begin{macrocode}
\let\frozen@everymath\everymath
\let\frozen@everydisplay\everydisplay
% \end{macrocode}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\everymath}
% \changes{v2.1a}{1994/01/17}{New math font setup}
% \begin{macro}{\everydisplay}
% \changes{v2.1a}{1994/01/17}{New math font setup}
% Now we provide now user hooks that will be called in the
% frozen internals.
% \begin{macrocode}