% \iffalse meta-comment
%
% Copyright 1994 the LaTeX3 project and the individual authors.
% All rights reserved. For further copyright information see the file
% legal.txt, and any other copyright indicated in this file.
% 
% This file is part of the LaTeX2e system.
% ----------------------------------------
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%  This system is distributed in the hope that it will be useful,
%  but WITHOUT ANY WARRANTY; without even the implied warranty of
%  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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% IMPORTANT NOTICE:
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% For error reports in case of UNCHANGED versions see bugs.txt.
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% ALLOWED to take money for the distribution or use of either this
% file or a changed version, except for a nominal charge for copying
% etc.
% \fi
%\iffalse   % this is a METACOMMENT !
%
%% File `oldlfont.dtx'.
%% Copyright (C) 1989-1994 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}
          [1994/11/06 v2.2j Standard LaTeX package]
%
% \iffalse
%</!latex209>
%<*driver>
\documentclass{ltxdoc}
\begin{document}
\DocInput{oldlfont.dtx}
\end{document}
%</driver>
% \fi
%
% \CheckSum{123}
%
%% \CharacterTable
%%  {Upper-case    \A\B\C\D\E\F\G\H\I\J\K\L\M\N\O\P\Q\R\S\T\U\V\W\X\Y\Z
%%   Lower-case    \a\b\c\d\e\f\g\h\i\j\k\l\m\n\o\p\q\r\s\t\u\v\w\x\y\z
%%   Digits        \0\1\2\3\4\5\6\7\8\9
%%   Exclamation   \!     Double quote  \"     Hash (number) \#
%%   Dollar        \$     Percent       \%     Ampersand     \&
%%   Acute accent  \'     Left paren    \(     Right paren   \)
%%   Asterisk      \*     Plus          \+     Comma         \,
%%   Minus         \-     Point         \.     Solidus       \/
%%   Colon         \:     Semicolon     \;     Less than     \<
%%   Equals        \=     Greater than  \>     Question mark \?
%%   Commercial at \@     Left bracket  \[     Backslash     \\
%%   Right bracket \]     Circumflex    \^     Underscore    \_
%%   Grave accent  \`     Left brace    \{     Vertical bar  \|
%%   Right brace   \}     Tilde         \~}
%
%
%
% \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}
%
% \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}
%
% \StopEventually{}
%
% \section{A driver for this document}
%
%    The next bit of code contains the documentation driver file for
%    \TeX{}, i.e., the file that will produce the documentation you
%    are currently reading. It will be extracted from this file by the
%    \dst{} program.
%    \begin{macrocode}
%<*driver>
\documentclass{ltxdoc}
\usepackage{oldlfont}
 %\OnlyDescription  % comment out for implementation details
\begin{document}
   \DocInput{oldlfont.dtx}
\end{document}
%</driver>
%    \end{macrocode}
%
% \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 \cmd\@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 automaticly
%    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 compatiblity reasons we will define these symbols.
%
%    \begin{macrocode}
\RequirePackage{latexsym}
%</package|latex209>
%    \end{macrocode}
%
% \DeleteShortVerb{\|}
% \Finale
\endinput
