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% \iffalse meta-comment
%
% Copyright (C) 1993-2022
% The LaTeX 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 % this is a METACOMMENT !
%
%% File `oldlfont.dtx'.
%% Copyright (C) 1989-1995 Frank Mittelbach and Rainer Sch\"opf,
%% all rights reserved.
%
%<*dtx>
\ProvidesFile{oldlfont.dtx}
%</dtx>
%<package>\NeedsTeXFormat{LaTeX2e}
%<package>\ProvidesPackage{oldlfont}
%<driver> \ProvidesFile{oldlfont.drv}
%<*!latex209>
% \fi
% \ProvidesFile{oldlfont.dtx}
[2014/09/29 v2.2k Standard LaTeX package]
%
% \iffalse
%</!latex209>
%<*driver>
\documentclass{ltxdoc}
\begin{document}
\DocInput{oldlfont.dtx}
\end{document}
%</driver>
% \fi
%
%
%
%
%
% \providecommand\dst{\expandafter{\normalfont\scshape docstrip}}
%
% \GetFileInfo{oldlfont.dtx}
%
% \title{The file \texttt{oldlfont.dtx} for use with
% \LaTeXe.\thanks{This file has version
% number \fileversion, dated \filedate.}\\[2pt]
% It contains the code for \texttt{oldlfont.sty}}
%
% \author{Frank Mittelbach}
%
% \MaintainedByLaTeXTeam{latex}
% \maketitle
%
% \section{Introduction}
%
% This file contains the code for the \texttt{oldlfont} package
% which emulates the following \LaTeX~2.09 font commands:
% \begin{itemize}
% \item The two-letter font-changing commands |\rm|, etc.~are
% defined to cancel each other out as they did in \LaTeX~2.09.
% \item The two-letter font-changing commands are allowed in math
% mode.
% \item The |latexsym| package is loaded.
% \end{itemize}
% For full compatibility mode, the file |latex209.def| is loaded by
% |\documentstyle|.
%
% The following modules are used in the implementation to direct
% \dst{} in generating the external files:
% \begin{center}
% \begin{tabular}{ll}
% driver & produce a documentation driver file \\
% package & produce |oldlfont.sty| \\
% latex209 & produce part of |latex209.def|
% \end{tabular}
% \end{center}
%
% \MaybeStop{}
%
% \changes{v2.2k}{1995/11/29}{Remove duplicate driver code.}
%
% \section{The Code}
%
%
% \begin{macro}{\math@bgroup}
% \begin{macro}{\math@egroup}
% To make \meta{math alphabet identifier} work like simple font
% switches we change the meaning of |\math@bgroup| and
% |\math@egroup| to |\@empty|. This emulates the behavior of
% \texttt{oldlfont.sty} in NFSS1 setups. These definitions are not
% part of \texttt{latex209} automatically, since to emulate 2.09
% they are not necessary (all standard fonts are declared as math
% symbol fonts).
% \changes{v2.2f}{1994/05/05}{Added saved versions of the
% math-groupers, CAR}
% \changes{v2.2g}{1994/05/09}{Moved outside latex209 part}
% \begin{macrocode}
\let\math@bgroup\@empty
\let\math@egroup\@empty
\let \@@math@bgroup \math@bgroup
\let \@@math@egroup \math@egroup
% \end{macrocode}
% \end{macro}
% \end{macro}
%
%
% The rest of this document describes code that is used in
% |oldlfont.sty| and |latex209.def|.
% \begin{macrocode}
%<*package|latex209>
% \end{macrocode}
%
% When emulating the old settings we don't want a lot of NFSS
% information being displayed. Thus we required that the
% \texttt{tracefnt} package is loaded with the option
% \texttt{errorshow}.
% \begin{macrocode}
\RequirePackage[errorshow]{tracefnt}
% \end{macrocode}
%
% We define math \emph{alphabet} identifiers for the typefaces
% described in the \LaTeX{} manual. This is straightforward. Some
% are already defined by the kernel code.
% And here are the other ones defined by the old \LaTeX{}. They all
% get declared as math symbol font alphabets. Thus we first
% allocate the additional symbol fonts.
% \begin{macrocode}
\DeclareSymbolFont{bold}{OT1}{cmr}{bx}{n}
\DeclareSymbolFont{sans}{OT1}{cmss}{m}{n}
\DeclareSymbolFont{typewriter}{OT1}{cmtt}{m}{n}
\DeclareSymbolFont{italic}{OT1}{cmr}{m}{it}
\DeclareSymbolFont{smallcaps}{OT1}{cmr}{m}{sc}
\DeclareSymbolFont{slanted}{OT1}{cmr}{m}{sl}
% \end{macrocode}
% And here are the corresponding math identifiers.
% \begin{macrocode}
\DeclareSymbolFontAlphabet\mathbf{bold}
\DeclareSymbolFontAlphabet\mathsf{sans}
\DeclareSymbolFontAlphabet\mathtt{typewriter}
\DeclareSymbolFontAlphabet\mathsc{smallcaps}
\DeclareSymbolFontAlphabet\mathsl{slanted}
% \end{macrocode}
% We undefine the old |\mit| and |\cal| macros (whatever meaning
% they have) and reallocate them as symbol font alphabets.
% \begin{macrocode}
\let\mit\undefined
\let\cal\undefined
\let\mathit\undefined
\DeclareSymbolFontAlphabet\mathit{italic}
\DeclareSymbolFontAlphabet{\mit}{letters}
\DeclareSymbolFontAlphabet{\cal}{symbols}
% \end{macrocode}
%
% We define the font commands for selecting the typeface. They are
% probably defined by the document class/style but we want to force
% the old meaning.
%
% And here are the definition as they were in \LaTeX~2.09 but
% translated into NFSS2 language.
% \changes{v2.2h}{1994/05/11}{DPC use \cs{DeclareProtectedCommand}}
% \changes{v2.2i}{1994/05/13}{DPC renamed to \cs{DeclareRobustCommand}}
% \begin{macrocode}
\DeclareRobustCommand\rm{\normalfont\rmfamily\mathgroup\symoperators}
\DeclareRobustCommand\sf{\normalfont\sffamily\mathgroup\symsans}
\DeclareRobustCommand\sl{\normalfont\slshape\mathgroup\symslanted}
\DeclareRobustCommand\bf{\normalfont\bfseries\mathgroup\symbold}
\DeclareRobustCommand\sc{\normalfont\scshape\mathgroup\symsmallcaps}
\DeclareRobustCommand\it{\normalfont\itshape\mathgroup\symitalic}
\DeclareRobustCommand\tt{\normalfont\ttfamily\mathgroup\symtypewriter}
% \end{macrocode}
% We also have to define the \emph{emphasize} font change command
% (i.e.\ |\em|). This command will look whether the current font is
% sloped (i.e.\ has a positive |\fontdimen1|) and will then select
% either |\rm| or |\it|.
% \begin{macrocode}
\DeclareRobustCommand\em{%
\@nomath\em
\ifdim \fontdimen\@ne\font>\z@\rm\else\it\fi}
% \end{macrocode}
%
% \begin{macro}{\@setfontsize}
% Font size changes are handled using the |\@setfontsize| command
% (in new class files) or by the |@setsize| command in old document
% style files. The latter is now defined to call |\@setfontsize| in
% the NFSS2 kernel code.
% Thus to make all size changing commands automatically return to
% the normal font of the document we only have to slightly modify
% the definition of |\@setfontsize| by adding a |\normalfont|
% command to it.
% \changes{v2.2j}{1994/11/06}{Use \cs{@typeset@protect}}
% \begin{macrocode}
\def\@setfontsize#1#2#3{\@nomath#1%
\ifx\protect\@typeset@protect
\let\@currsize#1%
\fi
\fontsize{#2}{#3}\normalfont}
% \end{macrocode}
% \end{macro}
%
%
% \begin{macro}{\non@alpherr}
% Since we emulate the old syntax we also have to silently ignore
% uses of a math alphabet outside math mode. Since we now use the
% |\sym...| switches the following setting is not longer necessary.
% \begin{macrocode}
%\let\non@alpherr\@gobble
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\not@math@alphabet}
% But we need to disable the error message that is generated from
% |\bfseries| etc.
% \begin{macrocode}
\let\not@math@alphabet\@gobbletwo
% \end{macrocode}
% \end{macro}
%
%
% We left out the special \LaTeX{} fonts which are not automatically
% included in the base version of the font selection since these
% fonts contain only a few characters which are also included in
% the AMS fonts so anybody who is using these fonts doesn't need
% them. But for compatibility reasons we will define these symbols.
%
% \begin{macrocode}
\RequirePackage{latexsym}
%</package|latex209>
% \end{macrocode}
%
% \DeleteShortVerb{\|}
% \Finale
\endinput
|
