% \iffalse meta-comment
%
% Copyright 1989-2001 Johannes L. Braams and any individual authors
% listed elsewhere in this file.  All rights reserved.
% 
% This file is part of the Babel system release 3.7.
% --------------------------------------------------
% 
% It may be distributed under the terms of the LaTeX Project Public
% License, as described in lppl.txt in the base LaTeX distribution.
% Either version 1.2 or, at your option, any later version.
% \fi
%    \CheckSum{1256}
%    
%    \iffalse
%    Tell the \LaTeX\ system who we are and write an entry on the
%    transcript.
%<*dtx>
\ProvidesFile{bulgarian.dtx}
%</dtx>
%<code>\ProvidesLanguage{bulgarian}
          [2001/01/30 v1.0b Bulgarian support from the babel system]
%
%% File `bulgarian.dtx'
%% Babel package for LaTeX version 2e
%% Copyright (C) 1989-2001
%%               by Johannes Braams,TeXniek
%
%% Bulgarian Language Definition File
%%               Copyright (C) 1995-2001
%%               by Georgi.Boshnakov<georgi.boshnakov@umist.ac.uk>
%%                  Johannes Braams,TeXniek
%
%% Adapted from russianb.dtx
%%               by Georgi.Boshnakov<georgi.boshnakov@umist.ac.uk>
%
%% Please report errors to:J.L.Braams
%%               babel@braams.cistron.nl
%
%<*filedriver>
\documentclass{ltxdoc}
\newcommand\TeXhax{\TeX hax}
\newcommand\babel{\textsf{babel}}
\newcommand\langvar{$\langle\it lang \rangle$}
\newcommand\note[1]{}
\newcommand\Lopt[1]{\textsf{#1}}
\newcommand\file[1]{\texttt{#1}}
\newcommand\pkg[1]{\texttt{#1}}
\begin{document}
 \DocInput{bulgarian.dtx}
\end{document}
%</filedriver>
%\fi
% \GetFileInfo{bulgarian.dtx}
% 
%    \changes{bulgarian-0.99}{2000/06/10}{%
%          This is a prerelease version of this file.
%          Features needing further testing are removed.}
%    
%    \section{The Bulgarian language}
%    
%    The file \file{\filename}\footnote{The file described in this
%    section has version number \fileversion\ and was last revised on
%    \filedate. This file was initially derived from the August-1998
%    version of \file{russianb.dtx}. 
%    
%    It is (reasonably) backward compatible with the 1994/1996
%    (non-babel) bulgarian style (bulgaria.sty) by Georgi
%    Boshnakov---files prepared for that style should compile
%    successfully (with vastly improved appearance due to usage of
%    standard fonts).} provides the language-specific macros for the
%    Bulgarian language. 
%    
%    Users should take note of the vaious ``cyrillic'' dashes
%    available now (see below). These should remove many causes of
%    headache. Also, although by default the Bulgarian quotation marks
%    will appear automatically when typesetting in Bulgarian, it is
%    better to use the new commands \cs{"'} and \cs{"'} which
%    explicitly typeset them.
%    Note: automatic switch to Bulgarian quotation is withdrawn
%    for the moment and may not be reintroduced at all.
%    
%    For this language the character |"| is made active. In
%    table~\ref{tab:bulgarian-quote} an overview is given of its
%    purpose.
%    
%    \begin{table}[htb]
%      \begin{center}
%      \begin{tabular}{lp{8cm}}
%       \verb="|= & disable ligature at this position.                \\
%       |"-| & an explicit hyphen sign, allowing hyphenation
%                       in the rest of the word.                      \\
%       |"---| & Cyrillic emdash in plain text.                       \\
%       |"--~| & Cyrillic emdash in compound names (surnames).        \\
%       |"--*| & Cyrillic emdash for denoting direct speech.          \\
%       |""|  & like |"-|, but producing no hyphen sign
%                       (for compound words with hyphen, e.g.\ |x-""y|
%                       or some other signs  as ``disable/enable'').  \\
%       |"~|   & for a compound word mark without a breakpoint.       \\
%       |"=|   & for a compound word mark with a breakpoint, allowing
%                       hyphenation in the composing words.           \\
%       |",|   & thinspace for initials with a breakpoint
%                       in following surname.                         \\
%       |"`|   & for German left double quotes
%                       (looks like ,\kern-0.08em,).                  \\
%       |"'|   & for German right double quotes (looks like ``).      \\%''
%       |"<|   & for French left double quotes  (looks like $<\!\!<$).\\
%       |">|   & for French right double quotes (looks like $>\!\!>$).\\
%      \end{tabular}
%      \caption{The extra definitions made
%                by\file{bulgarian}}\label{tab:bulgarian-quote}
%      \end{center}
%    \end{table}
%    
%    The quotes in table~\ref{tab:bulgarian-quote} can also be typeset
%    by using the commands in table~\ref{tab:bmore-quote}.
%    
%    \begin{table}[htb]
%      \begin{center}
%      \begin{tabular}{lp{8cm}}
%       |\cdash---| & Cyrillic emdash in plain text.                 \\
%       |\cdash--~| & Cyrillic emdash in compound names (surnames).  \\
%       |\cdash--*| & Cyrillic emdash for denoting direct speech.    \\
%       |\glqq|     & for German left double quotes
%                         (looks like,\kern-0.08em,).                 \\
%       |\grqq|     & for German right double quotes (looks like ``).\\%''
%       |\flqq|     & for French left double quotes (looks like $<\!\!<$).\\
%       |\frqq|     & for French right double quotes (looks like $>\!\!>$).\\
%       |\dq|       & the original quotes character (|"|).
%      \end{tabular}
%      \caption{More commands which produce quotes, defined
%                by \babel}\label{tab:bmore-quote}
%      \end{center}
%    \end{table}
%    
%    The French quotes are also available as ligatures `|<<|' and
%    `|>>|' in 8-bit Cyrillic font encodings (\texttt{LCY},
%    \texttt{X2}, \texttt{T2*}) and as `|<|' and `|>|' characters in
%    7-bit Cyrillic font encodings (\texttt{OT2} and \texttt{LWN}).
%    
%    The quotation marks traditionally used in Bulgarian were borrowed
%    from German o they keep their original names. French quotation
%    marks may be seen as well in older books. 
% 
% \StopEventually{}
% 
%    The macro |\LdfInit| takes care of preventing that this file is
%    loaded more than once, checking the category code of the
%    \texttt{@} sign, etc. 
%    
%    \begin{macrocode}
%<*code>
\LdfInit{bulgarian}{captionsbulgarian}
%    \end{macrocode}
%    
%    When this file is read as an option, i.e., by the |\usepackage|
%    command, \texttt{bulgarian} will be an `unknown' language, in
%    which case we have to make it known. So we check for the
%    existence of |\l@bulgarian| to see whether we have to do
%    something here. 
%    
%    \begin{macrocode}
\ifx\l@bulgarian\@undefined
  \@nopatterns{Bulgarian}
  \adddialect\l@bulgarian0
\fi
%    \end{macrocode}
%    
%    
%    
% \begin{macro}{\latinencoding}
%
%    We need to know the encoding for text that is supposed to be
%    which is active at the end of the \babel\ package. If the
%    \pkg{fontenc} package is loaded later, then \ldots too bad!
%    
%    \begin{macrocode}
\let\latinencoding\cf@encoding
%    \end{macrocode}
%    
% \end{macro}
%
%    The user may choose between different available Cyrillic
%    encodings---e.g., \texttt{X2}, \texttt{LCY}, or \texttt{LWN}.
%    If the user wants to use a font encoding other than the default
%    (\texttt{T2A}), he has to load the corresponding file
%    \emph{before} \file{bulgarian.sty}. 
%    This may be done in the following way:
%    
%    \begin{verbatim}
%      \usepackage[LCY,OT1]{fontenc}     %overwrite the default encoding;
%      \usepackage[english,bulgarian]{babel}
%    \end{verbatim}
%    \unskip
%    
%    Note: most people would prefer the \texttt{T2A} to \texttt{X2},
%    because \texttt{X2} does not contain Latin letters, and  users
%    should be very careful to switch the language every time they 
%    want to typeset a Latin word inside a Bulgarian phrase or vice
%    versa. On the other hand, switching the language is a good
%    practice anyway. With a decent text processing program it does
%    not involve more work than switching between the Bulgarian and
%    English keyboard. Moreover that the far most common disruption
%    occurs  as a result of forgetting to switch back to cyrillic
%    keyboard. 
%    
%    We parse the |\cdp@list| containing the encodings known to
%    \LaTeX\ in the order they were loaded. We set the
%    |\cyrillicencoding| to the \emph{last} loaded encoding in the
%    list of supported Cyrillic encodings: \texttt{OT2}, \texttt{LWN},
%    \texttt{LCY}, \texttt{X2}, \texttt{T2C}, \texttt{T2B},
%    \texttt{T2A}, if any. 
%    
%    
%    \begin{macrocode}
\def\reserved@a#1#2{%
   \edef\reserved@b{#1}%
   \edef\reserved@c{#2}%
   \ifx\reserved@b\reserved@c
     \let\cyrillicencoding\reserved@c
   \fi}
\def\cdp@elt#1#2#3#4{%
   \reserved@a{#1}{OT2}%
   \reserved@a{#1}{LWN}%
   \reserved@a{#1}{LCY}%
   \reserved@a{#1}{X2}%
   \reserved@a{#1}{T2C}%
   \reserved@a{#1}{T2B}%
   \reserved@a{#1}{T2A}}
\cdp@list
%    \end{macrocode}
%    
%    Now, if |\cyrillicencoding| is undefined, then the user did not
%    load any of supported encodings. So, we have to set
%    |\cyrillicencoding| to some default value. We test the presence
%    of the encoding definition files in the order from less
%    preferable to more preferable encodings. We use the lowercase
%    names (i.e., \file{lcyenc.def} instead of \file{LCYenc.def}).
%    
%    \begin{macrocode}
\ifx\cyrillicencoding\undefined
  \IfFileExists{ot2enc.def}{\def\cyrillicencoding{OT2}}\relax
  \IfFileExists{lwnenc.def}{\def\cyrillicencoding{LWN}}\relax
  \IfFileExists{lcyenc.def}{\def\cyrillicencoding{LCY}}\relax
  \IfFileExists{x2enc.def}{\def\cyrillicencoding{X2}}\relax
  \IfFileExists{t2cenc.def}{\def\cyrillicencoding{T2C}}\relax
  \IfFileExists{t2benc.def}{\def\cyrillicencoding{T2B}}\relax
  \IfFileExists{t2aenc.def}{\def\cyrillicencoding{T2A}}\relax
%    \end{macrocode}
%    
%    If |\cyrillicencoding| is still undefined, then the user seems
%    not to  have a properly installed distribution. A fatal error.
%    
%    \begin{macrocode}
\ifx\cyrillicencoding\undefined
    \PackageError{babel}%
    {No Cyrillic encoding definition files were found}%
    {Your installation is incomplete. \MessageBreak
    You need at least one of the following files: \MessageBreak
    \space\space
    x2enc.def, t2aenc.def, t2benc.def, t2cenc.def, \MessageBreak
    \space\space
    lcyenc.def, lwnenc.def, ot2enc.def.}%
  \else
%    \end{macrocode}
%    
%    We avoid |\usepackage[\cyrillicencoding]{fontenc}| because we
%    don't want to force the switch of |\encodingdefault|.
%    
%    \begin{macrocode}
    \lowercase
      \expandafter{\expandafter\input\cyrillicencoding enc.def\relax}%
  \fi
\fi
%    \end{macrocode}
%    
%    \begin{verbatim}
%      \PackageInfo{babel}
%        {Using `\cyrillicencoding' as a default Cyrillic encoding}%
%    \end{verbatim}
%    \unskip
%    
%    
%    
%    \begin{macrocode}
\DeclareRobustCommand{\Bulgarian}{%
  \fontencoding\cyrillicencoding\selectfont
  \let\encodingdefault\cyrillicencoding
  \expandafter\set@hyphenmins\bulgarianhyphenmins
  \language\l@bulgarian}
\DeclareRobustCommand{\English}{%
  \fontencoding\latinencoding\selectfont
  \let\encodingdefault\latinencoding
  \expandafter\set@hyphenmins\englishhyphenmins
  \language\l@english}
\let\Bul\Bulgarian
\let\Bg\Bulgarian
\let\cyrillictext\Bulgarian
\let\cyr\Bulgarian
\let\Eng\English
\def\selectenglanguage{\selectlanguage{english}}
\def\selectbglanguage{\selectlanguage{bulgarian}}
%    \end{macrocode}
%    
%    Since the \texttt{X2} encoding does not contain Latin letters,we 
%    should make some redefinitions of \LaTeX\ macros which implicitly 
%    produce Latin letters.
%    
%    
%    \begin{macrocode}
\expandafter\ifx\csname T@X2\endcsname\relax\else
%    \end{macrocode}
%    
%    We put |\latinencoding| in braces to avoid problems with |\@alph|
%    inside minipages (e.g., footnotes inside minipages) where
%    |\@alph| is expanded and we get for example `|\fontencoding OT1|'
%    (|\fontencoding| is robust).
%    
%    \begin{macrocode}
  \def\@Alph@eng#1{{\fontencoding{\latinencoding}\selectfont 
      \ifcase#1\or A\or B\or C\or D\or E\or F\or G\or H\or I\or J\or
      K\or L\or M\or N\or O\or P\or Q\or R\or S\or T\or U\or V\or W\or
      X\or Y\or Z\else \@ctrerr\fi}}%
  \def\@alph@eng#1{{\fontencoding{\latinencoding}\selectfont
      \ifcase#1\or a\or b\or c\or d\or e\or f\or g\or h\or i\or j\or
      k\or l\or m\or n\or o\or p\or q\or r\or s\or t\or u\or v\or w\or
      x\or y\or z\else \@ctrerr\fi}
  \let\@Alph\@Alph@eng
  \let\@alph\@alph@eng
%    \end{macrocode}
%    
%    Unfortunately, the commands |\AA| and |\aa| are not encoding
%    dependent in \LaTeX\ (unlike e.g., |\oe| or |\DH|). They are
%    defined as |\r{A}| and |\r{a}|. This leads to unpredictable
%    results when the font encoding does not contain the Latin letters
%    `A' and `a' (like \texttt{X2}). 
%    
%    \begin{macrocode}
  \DeclareTextSymbolDefault{\AA}{OT1}
  \DeclareTextSymbolDefault{\aa}{OT1}
  \DeclareTextCommand{\AA}{OT1}{\r A}
  \DeclareTextCommand{\aa}{OT1}{\r a}
\fi
%    \end{macrocode}
%    
%    The following block redefines the character class of uppercase
%    Greek letters and some accents, if it is equal to 7 (variable
%    family), to avoid incorrect results if the font encoding in some
%    math family does not contain these characters in places of OT1
%    encoding. The code was taken from |amsmath.dtx|. See comments and
%    further explanation there. 
%    
%    \begin{macrocode}
\begingroup\catcode`\"=12
% uppercase greek letters:
\def\@tempa#1{\expandafter\@tempb\meaning#1\relax\relax\relax\relax
 "0000\@nil#1}
\def\@tempb#1"#2#3#4#5#6\@nil#7{%
\ifnum"#2=7 \count@"1#3#4#5\relax
\ifnum\count@<"1000 \else \global\mathchardef#7="0#3#4#5\relax \fi
 \fi}
\@tempa\Gamma\@tempa\Delta\@tempa\Theta\@tempa\Lambda\@tempa\Xi
\@tempa\Pi\@tempa\Sigma\@tempa\Upsilon\@tempa\Phi\@tempa\Psi
\@tempa\Omega
% some accents:
\def\@tempa#1#2\@nil{\def\@tempc{#1}}\def\@tempb{\mathaccent}
\expandafter\@tempa\hat\relax\relax\@nil
\ifx\@tempb\@tempc
\def\@tempa#1\@nil{#1}%
\def\@tempb#1{\afterassignment\@tempa\mathchardef\@tempc=}%
\def\do#1"#2{}
\def\@tempd#1{\expandafter\@tempb#1\@nil
 \ifnum\@tempc>"FFF
 \xdef#1{\mathaccent"\expandafter\do\meaning\@tempc\space}%
 \fi}
\@tempd\hat\@tempd\check\@tempd\tilde\@tempd\acute\@tempd\grave
\@tempd\dot\@tempd\ddot\@tempd\breve\@tempd\bar
\fi
\endgroup
%    \end{macrocode}
%    
%    The user should use the \pkg{inputenc} package when any 8-bit
%    Cyrillic font encoding is used, selecting one of the Cyrillic
%    input encodings. We do not assume any default input encoding, so
%    the user should explicitly call the \pkg{inputenc} package by
%    |\usepackage{inputenc}|. We also removed |\AtBeginDocument|, so
%    \pkg{inputenc} should be used before \babel. 
%    
%    \begin{macrocode}
\@ifpackageloaded{inputenc}{}{%
\def\reserved@a{LWN}%
\ifx\reserved@a\cyrillicencoding\else
\def\reserved@a{OT2}%
\ifx\reserved@a\cyrillicencoding\else
\PackageWarning{babel}%
{No input encoding specified for Bulgarian language}\fi\fi}
%    \end{macrocode}
%    
%    Now we define two commands that offer the possibility to switch
%    between Cyrillic and Roman encodings.
%    
% \begin{macro}{\cyrillictext}
% \begin{macro}{\latintext}
%
%    The command |\cyrillictext| will switch from Latin font encoding
%    to the Cyrillic font encoding, the command |\latintext| switches
%    back. This assumes that the `normal' font encoding is a Latin
%    one. These commands are \emph{declarations}, for shorter peaces
%    of text the commands |\textlatin| and |\textcyrillic| can be
%    used.
%    
%    We comment out |\latintext| since it is defined in the core of
%    babel (babel.def). We add the shorthand |\lat| for |\latintext|.
%    Note that |\cyrillictext| has been defined above.
%    
%    \begin{macrocode}
% \DeclareRobustCommand{\latintext}{%
% \fontencoding{\latinencoding}\selectfont
%   \def\encodingdefault{\latinencoding}}
\let\lat\latintext
%    \end{macrocode}
%    
% \end{macro}
% \end{macro}
%
% \begin{macro}{\textcyrillic}
% \begin{macro}{\textlatin}
%
%    These commands take an argument which is then typeset using the
%    requested font encoding.
%    |\textlatin| is commented out since it is defined in the core of
%    babel. (It is defined there with |\DeclareRobustCommand| instead.)
%    
%    \begin{macrocode}
\DeclareTextFontCommand{\textcyrillic}{\cyrillictext}
% \DeclareTextFontCommand{\textlatin}{\latintext}
%    \end{macrocode}
%    
% \end{macro}
% \end{macro}
%
%    The next step consists of defining commands to switch to (and 
%    from) the Bulgarian language.
%    
% \begin{macro}{\captionsbulgarian}
%
%    The macro |\captionsbulgarian| defines all strings used in the
%    four standard document classes provided with \LaTeX. The two
%    commands |\cyr| and |\lat| activate Cyrillic resp. Latin encoding.
%    
%    \begin{macrocode}
\addto\captionsbulgarian{%
  \def\prefacename{%
    {\cyr\CYRP\cyrr\cyre\cyrd\cyrg\cyro\cyrv\cyro\cyrr}}%
  \def\refname{%
    {\cyr\CYRL\cyri\cyrt\cyre\cyrr\cyra\cyrt\cyru\cyrr\cyra}}%
  \def\abstractname{%
    {\cyr\CYRA\cyrb\cyrs\cyrt\cyrr\cyra\cyrk\cyrt}}%
  \def\bibname{%
    {\cyr\CYRB\cyri\cyrb\cyrl\cyri\cyro\cyrg\cyrr\cyra\cyrf\cyri\cyrya}}%
  \def\chaptername{%
    {\cyr\CYRG\cyrl\cyra\cyrv\cyra}}%
  \def\appendixname{%
    {\cyr\CYRP\cyrr\cyri\cyrl\cyro\cyrzh\cyre\cyrn\cyri\cyre}}%
  \def\contentsname{%
    {\cyr\CYRS\cyrhrdsn\cyrd\cyrhrdsn\cyrr\cyrzh\cyra\cyrn\cyri\cyre}}%
  \def\listfigurename{%
    {\cyr\CYRS\cyrp\cyri\cyrs\cyrhrdsn\cyrk\ \cyrn\cyra\ \cyrf\cyri\cyrg\cyru\cyrr\cyri\cyrt\cyre}}%
  \def\listtablename{%
    {\cyr\CYRS\cyrp\cyri\cyrs\cyrhrdsn\cyrk\ \cyrn\cyra\ \cyrt\cyra\cyrb\cyrl\cyri\cyrc\cyri\cyrt\cyre}}%
  \def\indexname{%
    {\cyr\CYRA\cyrz\cyrb\cyru\cyrch\cyre\cyrn\ \cyru\cyrk\cyra\cyrz\cyra\cyrt\cyre\cyrl}}%
  \def\authorname{%
    {\cyr\CYRI\cyrm\cyre\cyrn\cyre\cyrn\ \cyru\cyrk\cyra\cyrz\cyra\cyrt\cyre\cyrl}}%
  \def\figurename{%
    {\cyr\CYRF\cyri\cyrg\cyru\cyrr\cyra}}%
  \def\tablename{%
    {\cyr\CYRT\cyra\cyrb\cyrl\cyri\cyrc\cyra}}%
  \def\partname{%
    {\cyr\CYRCH\cyra\cyrs\cyrt}}%
  \def\enclname{%
    {\cyr\CYRP\cyrr\cyri\cyrl\cyro\cyrzh\cyre\cyrn\cyri\cyrya}}%
  \def\ccname{%
    {\cyr\cyrk\cyro\cyrp\cyri\cyrya}}%
  \def\headtoname{%
    {\cyr\CYRZ\cyra}}%
  \def\pagename{%
    {\cyr\CYRS\cyrt\cyrr.}}%
  \def\seename{%
    {\cyr\cyrv\cyrzh.}}%
  \def\alsoname{%
    {\cyr\cyrv\cyrzh.\ \cyrs\cyrhrdsn\cyrshch\cyro\ \cyri}}%
  \def\proofname{Proof}% <-- Needs translation
  \def\glossaryname{Glossary}% <-- Needs translation
}
%    \end{macrocode}    
% \end{macro}
%%    
% \begin{macro}{\datebulgarian}
%
%    The macro |\datebulgarian| redefines the command |\today| to
%    produce Bulgarian dates.
%    It also provides the command |\todayRoman| which produces the
%    date with the month in capital roman numerals, a popular format
%    for dates in Bulgarian. 
%    
%    \begin{macrocode}
\def\datebulgarian{%
  \def\month@bulgarian{\ifcase\month\or 
    \cyrya\cyrn\cyru\cyra\cyrr\cyri\or 
    \cyrf\cyre\cyrv\cyrr\cyru\cyra\cyrr\cyri\or 
    \cyrm\cyra\cyrr\cyrt\or 
    \cyra\cyrp\cyrr\cyri\cyrl\or 
    \cyrm\cyra\cyrishrt\or 
    \cyryu\cyrn\cyri\or 
    \cyryu\cyrl\cyri\or 
    \cyra\cyrv\cyrg\cyru\cyrs\cyrt\or 
    \cyrs\cyre\cyrp\cyrt\cyre\cyrm\cyrv\cyrr\cyri\or 
    \cyro\cyrk\cyrt\cyro\cyrm\cyrv\cyrr\cyri\or 
    \cyrn\cyro\cyre\cyrm\cyrv\cyrr\cyri\or 
    \cyrd\cyre\cyrk\cyre\cyrm\cyrv\cyrr\cyri\fi}%
  \def\month@Roman{\expandafter\@Roman\month}%
  \def\today{\number\day~\month@bulgarian\ \number\year~\cyrg.}%
  \def\todayRoman{\number\day.\,\month@Roman.\,\number\year~\cyrg.}%
}
%    \end{macrocode}
%    
% \end{macro}
%
%    
%    
% \begin{macro}{\todayRoman}
%
%    The month is often written with roman numbers in Bulgarian dates.
%    Here we define date in this format:
%    
%    \begin{macrocode}
\def\Romannumeral#1{\uppercase\expandafter{\romannumeral #1}}
\def\todayRoman{\number\day.\Romannumeral{\month}.\number\year~\cyrg.}
%    \end{macrocode}
%    
% \end{macro}
%
% \begin{macro}{\extrasbulgarian}
%
%    The macro |\extrasbulgarian| will perform all the extra
%    definitions needed for the Bulgarian language.
%    The macro |\noextrasbulgarian| is used to cancel the actions of
%    |\extrasbulgarian|. 
%    
%    The first action we define is to switch on the selected Cyrillic
%    encoding whenever we enter `bulgarian'.
%    
%    \begin{macrocode}
\addto\extrasbulgarian{\cyrillictext}
%    \end{macrocode}
%    
%    When the encoding definition file was processed by \LaTeX\ the
%    current font encoding is stored in |\latinencoding|, assuming
%    that \LaTeX\ uses \texttt{T1} or \texttt{OT1} as
%    default. Therefore we switch back to |\latinencoding| whenever
%    the Bulgarian language is no longer `active'. 
%    
%    \begin{macrocode}
\addto\noextrasbulgarian{\latintext}
%    \end{macrocode}
%    
%    For Bulgarian the \texttt{"} character also is made active.
%    
%    \begin{macrocode}
\initiate@active@char{"}
%    \end{macrocode}
%    
%    The code above is necessary because we need extra active
%    characters. The character |"| is used as indicated in
%    table~\ref{tab:bulgarian-quote}. We specify that the Bulgarian
%    group of shorthands should be used. 
%    
%    \begin{macrocode}
\addto\extrasbulgarian{\languageshorthands{bulgarian}}
%    \end{macrocode}
%    
%    These characters are `turned on' once, later their definition may
%    vary.
%    
%    \begin{macrocode}
\addto\extrasbulgarian{%
  \bbl@activate{"}}
\addto\noextrasbulgarian{%
  \bbl@deactivate{"}}
%    \end{macrocode}
%    
%    The \texttt{X2} and \texttt{T2*} encodings do not contain
%    |spanish_shriek| and |spanish_query| symbols; as a consequence,
%    the ligatures `|?`|' and `|!`|' do not work with them (these
%    characters are useless for Cyrillic texts anyway). But we define
%    the shorthands to emulate these ligatures (optionally).
%    
%    We do not use |\latinencoding| here (but instead explicitly use
%    \texttt{OT1}) because the user may choose \texttt{T2A} to be the
%    primary encoding, but it does not contain these characters.
%    
%    \begin{macrocode}
%<*spanishligs>
\declare@shorthand{bulgarian}{?`}{\UseTextSymbol{OT1}\textquestiondown}
\declare@shorthand{bulgarian}{!`}{\UseTextSymbol{OT1}\textexclamdown}
%</spanishligs>
%    \end{macrocode}
%    
%    To be able to define the function of `|"|', we first define a
%    couple of `support' macros.
%    
% \begin{macro}{\dq}
%
%    We save the original double quote character in |\dq| to keep it 
%    available, the math accent |\"|can now be typed as `|"|'.
%    
%    \begin{macrocode}
\begingroup \catcode`\"12
\def\reserved@a{\endgroup
  \def÷ĀSS{\mathchar"7019}
  \def\dq{"}}
\reserved@a
%    \end{macrocode}
%    
% \end{macro}
%
%    Now we can define the doublequote macros: german and french
%    quotes. We use definitions of these quotes made in babel.sty.
%    The french quotes are contained in the \texttt{T2*} encodings.
%    
%    \begin{macrocode}
\declare@shorthand{bulgarian}{"`}{\glqq}
\declare@shorthand{bulgarian}{"'}{\grqq}
\declare@shorthand{bulgarian}{"<}{\flqq}
\declare@shorthand{bulgarian}{">}{\frqq}
%    \end{macrocode}
%    
%    Some additional commands:
%    
%    \begin{macrocode}
\declare@shorthand{bulgarian}{""}{\hskip\z@skip}
\declare@shorthand{bulgarian}{"~}{\textormath{\leavevmode\hbox{-}}{-}}
\declare@shorthand{bulgarian}{"=}{\nobreak-\hskip\z@skip}
\declare@shorthand{bulgarian}{"|}{%
\textormath{\nobreak\discretionary{-}{}{\kern.03em}%
\allowhyphens}{}}
%    \end{macrocode}
%    
%    The next two macros for |"-| and |"---| are somewhat different.
%    We must check whether the second token is a hyphen character:
%    
%    \begin{macrocode}
\declare@shorthand{bulgarian}{"-}{%
%    \end{macrocode}
%    
%    If the next token is `|-|', we typeset an emdash, otherwise a
%    hyphen sign:
%    
%    \begin{macrocode}
  \def\bulgarian@sh@tmp{%
    \if\bulgarian@sh@next-\expandafter\bulgarian@sh@emdash
    \else\expandafter\bulgarian@sh@hyphen\fi
  }%
%    \end{macrocode}
%    
%    \TeX\ looks for the next token after the first `|-|': the meaning
%    of this token is written to |\bulgarian@sh@next| and
%    |\bulgarian@sh@tmp| is called.
%    
%    \begin{macrocode}
  \futurelet\bulgarian@sh@next\bulgarian@sh@tmp}
%    \end{macrocode}
%    
%    Here are the definitions of hyphen and emdash. First the hyphen:
%    
%    \begin{macrocode}
\def\bulgarian@sh@hyphen{\nobreak\-\bbl@allowhyphens}
%    \end{macrocode}
%    
%    For the emdash definition, there are the two parameters: we must
%    `eat' two last hyphen signs of our emdash \dots :
%    
%    \begin{macrocode}
\def\bulgarian@sh@emdash#1#2{\cdash-#1#2}
%    \end{macrocode}
%    
% \begin{macro}{\cdash}
%
%    \dots\ these two parameters are useful for another macro:
%    |\cdash|:
%    
%    \begin{macrocode}
\ifx\cdash\undefined % should be defined earlier
\def\cdash#1#2#3{\def\tempx@{#3}%
\def\tempa@{-}\def      empb@{~}\def    empc@{*}%
 \ifx\tempx@\tempa@\@Acdash\else
  \ifx\tempx@\tempb@\@Bcdash\else
   \ifx\tempx@\tempc@\@Ccdash\else
    \errmessage{Wrong usage of cdash}\fi\fi\fi}
%    \end{macrocode}
%    
%  second parameter (or third for |\cdash|) shows what kind of emdash
%  to create in next step
%  \begin{center}
%  \begin{tabular}{@{}p{.1\hsize}@{}p{.9\hsize}@{}}
%   |"---| & ordinary (plain) Cyrillic emdash inside text:
%   an unbreakable thinspace will be inserted before only in case of
%   a \textit{space} before the dash (it is necessary for dashes after
%   display maths formulae: there could be lists, enumerations etc.\ 
%   started with ``---where $a$ is ...'' i.e., the dash starts a line).
%   (Firstly there were planned rather soft rules for user:he may put
%   a space before the dash or not. But it is difficult to place this
%   thinspace automatically, i.e., by checking modes because after
%   display formulae \TeX{} uses horizontal mode. Maybe there is a 
%   misunderstanding? Maybe there is another way?) After a dash
%   a breakable thinspace is always placed; \\
%  \end{tabular}
%  \end{center}
%    
%    
%    \begin{macrocode}
% What is more grammatically: .2em or .2\fontdimen6\font?
\def\@Acdash{\ifdim\lastskip>\z@\unskip\nobreak\hskip.2em\fi
\cyrdash\hskip.2em\ignorespaces}%
%    \end{macrocode}
%    
%      \begin{center}
%      \begin{tabular}{@{}p{.1\hsize}@{}p{.9\hsize}@{}}
%       |"--~| & emdash in compound names or surnames
%       (like Mendeleev--Klapeiron); this dash has no space characters
%       around; after the dash some space is added
%       |\exhyphenalty| \\
%      \end{tabular}
%      \end{center}
%    
%    \begin{macrocode}
\def\@Bcdash{\leavevmode\ifdim\lastskip>\z@\unskip\fi
 \nobreak\cyrdash\penalty\exhyphenpenalty\hskip\z@skip\ignorespaces}%
%    \end{macrocode}
%    
%    \begin{center}
%    \begin{tabular}{@{}p{.1\hsize}@{}p{.9\hsize}@{}}
%     |"--*| & for denoting direct speech (a space like |\enskip|
%     must follow the emdash); \\
%    \end{tabular}
%    \end{center}
%    
%    \begin{macrocode}
\def\@Ccdash{\leavevmode
 \nobreak\cyrdash\nobreak\hskip.35em\ignorespaces}%
%\fi
%    \end{macrocode}
%    
% \end{macro}
%
%    
%    
% \begin{macro}{\cyrdash}
%
%    Finally the macro for ``body'' of the Cyrillic emdash.
%    The |\cyrdash| macro will be defined in case this macro hasn't
%    been defined in a fontenc file. For T2*fonts, cyrdash will be
%    placed in the code of the English emdash thus it uses ligature
%    |---|. 
%    
%    \begin{macrocode}
% Is there an IF necessary?
\ifx\cyrdash\undefined
\def\cyrdash{\hbox to.8em{--\hss--}}
\fi
%    \end{macrocode}
%    
% \end{macro}
%
%    Here a really new macro---to place thinspace between initials.
%    This macro used instead of |\,| allows hyphenation in the
%    following surname.
%    
%    \begin{macrocode}
\declare@shorthand{bulgarian}{",}{\nobreak\hskip.2em\ignorespaces}
%    \end{macrocode}
%    
%    The Bulgarian hyphenation patterns can be used with
%    |\lefthyphenmin| and |\righthyphenmin| set to~2.
% \changes{bulgarian-1.0b}{2000/09/22}{Now use \cs{providehyphenmins} to
%    provide a default value}
%    \begin{macrocode}
\providehyphenmins{\CurrentOption}{\tw@\tw@}
\fi
%    \end{macrocode}
%    
%    Now the action |\extrasbulgarian| has to execute is to make sure
%    that the command |\frenchspacing| is in effect. If this is not
%    the case the execution of |\noextrasbulgarian| will switch it off
%    again.
%    
%    \begin{macrocode}
\addto\extrasbulgarian{\bbl@frenchspacing}
\addto\noextrasbulgarian{\bbl@nonfrenchspacing}
%    \end{macrocode}
%    
%    Make the double quotes produce the traditional quotes
%    used in Bulgarian texts (these are the German quotes). 
%    
%    \begin{macrocode}
% \initiate@active@char{`}
%  \initiate@active@char{'}
% \addto\extrasbulgarian{%
%   \bbl@activate{`}}
% \addto\extrasbulgarian{%
%   \bbl@activate{'}}
% \addto\noextrasbulgarian{%
%   \bbl@deactivate{`}}
% \addto\noextrasbulgarian{%
%   \bbl@deactivate{'}}
% \def\mlron{\bbl@activate{`}\bbl@activate{'}}
% \def\mlroff{\bbl@deactivate{`}\bbl@deactivate{'}}
% \declare@shorthand{bulgarian}{``}{\glqq}
% \declare@shorthand{bulgarian}{''}{\grqq}
%    \end{macrocode}
%    
% \end{macro}
%
%    Next we add a new enumeration style for Bulgarian manuscripts with
%    Cyrillic letters,and later on we define some math operator names in
%    accordance with Bulgarian typesetting traditions.
%    
% \begin{macro}{\@Alph@bul}
%
%    We begin by defining |\@Alph@bul| which works like |\@Alph|, but
%    produces (uppercase) Cyrillic letters intead of Latin ones. The
%    letters ISHRT, HRDSN and SFTSN are skipped, as usual for such
%    enumeration.
%    
%    \begin{macrocode}
\def\enumBul{\let\@Alph\@Alph@bul \let\@alph\@alph@bul}
\def\enumEng{\let\@Alph\@Alph@eng \let\@alph\@alph@eng}
\def\enumLat{\let\@Alph\@Alph@eng \let\@alph\@alph@eng}
\addto\extrasbulgarian{\enumBul}
\addto\noextrasbulgarian{\enumLat}
\def\@Alph@bul#1{%
  \ifcase#1\or
  \CYRA\or \CYRB\or \CYRV\or \CYRG\or \CYRD\or \CYRE\or \CYRZH\or
  \CYRZ\or \CYRI\or \CYRK\or \CYRL\or \CYRM\or \CYRN\or \CYRO\or
  \CYRP\or \CYRR\or \CYRS\or \CYRT\or \CYRU\or \CYRF\or \CYRH\or
  \CYRC\or \CYRCH\or \CYRSH\or \CYRSHCH\or \CYRYU\or \CYRYA\else
  \@ctrerr\fi
 }
\def\@Alph@eng#1{%
  \ifcase#1\or 
  A\or B\or C\or D\or E\or F\or G\or H\or I\or J\or K\or L\or M\or 
  N\or O\or P\or Q\or R\or S\or T\or U\or V\or W\or X\or Y\or Z\else
  \@ctrerr\fi
  }
%    \end{macrocode}
%    
% \end{macro}
%
%    
%    
% \begin{macro}{\@alph@bul}
%
%    The macro |\@alph@bul| is similar to |\@Alph@bul|;
%    it produces lowercase Bulgarian letters.
%    
%    \begin{macrocode}
\def\@alph@bul#1{%
  \ifcase#1\or 
  \cyra\or \cyrb\or \cyrv\or \cyrg\or \cyrd\or \cyre\or \cyrzh\or 
  \cyrz\or \cyri\or \cyrk\or \cyrl\or \cyrm\or \cyrn\or \cyro\or 
  \cyrp\or \cyrr\or \cyrs\or \cyrt\or \cyru\or \cyrf\or \cyrh\or 
  \cyrc\or \cyrch\or \cyrsh\or \cyrshch\or \cyryu\or \cyrya\else
  \@ctrerr\fi
  }
\def\@alph@eng#1{%
  \ifcase#1\or 
  a\or b\or c\or d\or e\or f\or g\or h\or i\or j\or k\or l\or m\or 
  n\or o\or p\or q\or r\or s\or t\or u\or v\or w\or x\or y\or z\else
  \@ctrerr\fi
  }
%    \end{macrocode}
%    
% \end{macro}
%
%    Set up default Cyrillic math alphabets. To use Cyrillic letters
%    in math mode user should load the |textmath| package
%    \emph{before} loading fontenc package (or \babel). Note,that by
%    default Cyrillic letters are taken from upright font in math mode
%    (unlike Latin letters). 
%    
%    \begin{macrocode}
%\RequirePackage{textmath}
\@ifundefined{sym\cyrillicencoding letters}{}{%
\SetSymbolFont{\cyrillicencoding letters}{bold}\cyrillicencoding
  \rmdefault\bfdefault\updefault
\DeclareSymbolFontAlphabet\cyrmathrm{\cyrillicencoding letters}
%    \end{macrocode}
%    
%    And we need a few commands to be able to switch to different
%    variants.
%    
%    \begin{macrocode}
\DeclareMathAlphabet\cyrmathbf\cyrillicencoding
  \rmdefault\bfdefault\updefault
\DeclareMathAlphabet\cyrmathsf\cyrillicencoding
  \sfdefault\mddefault\updefault
\DeclareMathAlphabet\cyrmathit\cyrillicencoding
  \rmdefault\mddefault\itdefault
\DeclareMathAlphabet\cyrmathtt\cyrillicencoding
  \ttdefault\mddefault\updefault
\SetMathAlphabet\cyrmathsf{bold}\cyrillicencoding
  \sfdefault\bfdefault\updefault
\SetMathAlphabet\cyrmathit{bold}\cyrillicencoding
  \rmdefault\bfdefault\itdefault
}
%    \end{macrocode}
%    
%    Some math functions in Bulgarian math books have other names:
%    e.g., \texttt{sinh} in Bulgarian is written as \texttt{sh}
%    etc. So we define a number of new math operators.
%    
%    |\sinh|:
%    
%    \begin{macrocode}
\def\sh{\mathop{\operator@font sh}\nolimits}
%    \end{macrocode}
%    
%    |\cosh|:
%    
%    \begin{macrocode}
\def\ch{\mathop{\operator@font ch}\nolimits}
%    \end{macrocode}
%    
%    |\tan|:
%    
%    \begin{macrocode}
\def\tg{\mathop{\operator@font tg}\nolimits}
%    \end{macrocode}
%    
%    |\arctan|:
%    
%    \begin{macrocode}
\def\arctg{\mathop{\operator@font arctg}\nolimits}
%    \end{macrocode}
%    
%    |\arccot|:
%    
%    \begin{macrocode}
\def\arcctg{\mathop{\operator@font arcctg}\nolimits}
%    \end{macrocode}
%    
%    The following macro conflicts with |\th| defined in Latin~1
%    encoding: |\tanh|:
%    
%    \begin{macrocode}
\def\th{\mathop{\operator@font th}\nolimits}
%    \end{macrocode}
%    
%    |\cot|:
%    
%    \begin{macrocode}
\def\ctg{\mathop{\operator@font ctg}\nolimits}
%    \end{macrocode}
%    
%    |\coth|:
%    
%    \begin{macrocode}
\def\cth{\mathop{\operator@font cth}\nolimits}
%    \end{macrocode}
%    
%    |\csc|:
%    
%    \begin{macrocode}
\def\cosec{\mathop{\operator@font cosec}\nolimits}
%    \end{macrocode}
%    
%    This is for compatibility with older Bulgarian packages.
%    
%    \begin{macrocode}
\DeclareRobustCommand{\No}{%
    \ifmmode{\nfss@text{\textnumero}}\else\textnumero\fi}
%    \end{macrocode}
%    
%    The macro |\ldf@finish| takes care of looking for a configuration
%    file, setting the main language to be switched on at
%    |\begin{document}| and resetting the category code of \texttt{@}
%    to its original value. 
%    
%    \begin{macrocode}
\ldf@finish{bulgarian}
%</code>
%    \end{macrocode}
%    
% \Finale
%% 
%% \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        \~}
%% 
\endinput