% \iffalse meta-comment
%
% Copyright 1989-1996 Johannes L. Braams and any individual authors
% listed elsewhere in this file.  All rights reserved.
% 
% For further copyright information see any other copyright notices in 
% this file.
% 
% This file is part of the Babel system release 3.6.
% --------------------------------------------------
%   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.
% 
%   For error reports concerning UNCHANGED versions of this file no
%   more than one year old, see bugs.txt.
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%   Please do not request updates from me directly.  Primary
%   distribution is through the CTAN archives.
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% 
% IMPORTANT COPYRIGHT NOTICE:
% 
% You are NOT ALLOWED to distribute this file alone.
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% You are allowed to distribute this file under the condition that it
% is distributed together with all the files listed in manifest.txt.
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% If you receive only some of these files from someone, complain!
% 
% Permission is granted to copy this file to another file with a
% clearly different name and to customize the declarations in that
% copy to serve the needs of your installation, provided that you
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% 
% \fi
% \CheckSum{305}
%
% \iffalse
%    Tell the \LaTeX\ system who we are and write an entry on the
%    transcript.
%<*dtx>
\ProvidesFile{greek.dtx}
%</dtx>
%<code>\ProvidesFile{greek.ldf}
%\fi
%\ProvidesFile{greek.dtx}
        [1996/12/23 v1.0b Greek support from the babel system]
%\iffalse
% Babel package for LaTeX version 2e
% Copyright (C) 1989 -- 1996
%           by Johannes Braams, TeXniek
%
% Greek language Definition File
% Copyright (C) 1996
%           by Apostolos Syropoulos
%              Johannes Braams, TeXniek
%
% Please report errors to: Apostolos Syropoulos
%                          apostolo@platon.ee.duth.gr
%                          (or J.L. Braams <JLBraams@cistron.nl)
%
%    This file is part of the babel system, it provides the source
%    code for the greek language definition file. The original
%    version of this file was written by Apostolos Syropoulos.
%<*filedriver>
\documentclass{ltxdoc}
\newcommand*{\TeXhax}{\TeX hax}
\newcommand*{\babel}{\textsf{babel}}
\newcommand*{\langvar}{$\langle \mathit lang \rangle$}
\newcommand*{\note}[1]{}
\newcommand*{\Lopt}[1]{\textsf{#1}}
\newcommand*{\file}[1]{\texttt{#1}}
\newcommand*{\pkg}[1]{\texttt{#1}}
\begin{document}
 \DocInput{greek.dtx}
\end{document}
%</filedriver>
%\fi
% \GetFileInfo{greek.dtx}
%
% \changes{greek-1.0b}{1996/07/10}{Replaced \cs{undefined} with
%    \cs{@undefined} and \cs{empty} with \cs{@empty} for consistency
%    with \LaTeX} 
% \changes{greek-1.0b}{1996/10/10}{Moved the definition of
%    \cs{atcatcode} right to the beginning.}
%
%  \section{The Greek language}
%
%    The file \file{\filename}\footnote{The file described in this
%    section has version number \fileversion\ and was last revised on
%    \filedate. The original author is Apostolos Syropoulos
%    (\texttt{apostolo@platon.ee.duth.gr}).} defines all the language
%    definition macros for the Greek language. 
%
% \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.
% \changes{greek-1.0b}{1996/11/02}{Now use \cs{LdfInit} to perform
%    initial checks} 
%    \begin{macrocode}
%<*code>
\LdfInit{greek}\captionsgreek
%    \end{macrocode}
%
%    When this file is read as an option, i.e. by the |\usepackage|
%    command, \texttt{greek} could be an `unknown' language in
%    which case we have to make it known.  So we check for the
%    existence of |\l@greek| to see whether we have to do
%    something here.
%
%    \begin{macrocode}
\ifx\l@greek\@undefined
  \@nopatterns{greek}
  \adddialect\l@greek0\fi
%    \end{macrocode}
%
%    Tyesetting Greek texts implies that a special set of fonts needs
%    to be used. The current support for greek uses a set of fonts
%    that more or less `match' with the computer modern
%    fonts. Therefore we define the Local GReek encoding (LGR, see the
%    file \file{greek.fdd}). We make sure that this encoding is known
%    to \LaTeX.
%    \begin{macrocode}
\input{LGRenc.def}
%    \end{macrocode}
%
%  \begin{macro}{\latinencoding}
%    We need to know the encoding for text that is supposed to be
%    typeset in  latin text. We assume that it will be the encoding
%    which is active at the end of the \babel\ package. If the
%    \pkg{fontenc} package is loaded later, then... too bad!
%    \begin{macrocode}
\AtEndOfPackage{\edef\latinencoding{\cf@encoding}}
%    \end{macrocode}
%  \end{macro}
%
%    Now we define two commands that offer the possibility to switch
%    between greek and roman encodings.
%
%  \begin{macro}{\greektext}
%  \begin{macro}{\latintext}
%    The command |\greektext| will switch from latin font encoding to
%    the greek 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 |\textgreek| can be used.
%    \begin{macrocode}
\DeclareRobustCommand{\greektext}{%
  \fontencoding{LGR}\selectfont
  \def\encodingdefault{LGR}}
\DeclareRobustCommand{\latintext}{%
  \fontencoding{\latinencoding}\selectfont
  \def\encodingdefault{\latinencoding}}
%    \end{macrocode}
%  \end{macro}
%  \end{macro}
%
%  \begin{macro}{\textgreek}
%  \begin{macro}{\textlatin}
%    These commands take an argument which is then typeset using the
%    requested font encoding. In order to avoid many encoding switches
%    both commands operate in a local scope.
% \changes{greek-1.0b}{1996/09/23}{Added a level of braces to keep
%    encoding change local} 
%    \begin{macrocode}
\DeclareRobustCommand{\textgreek}[1]{{\greektext #1}}
\DeclareRobustCommand{\textlatin}[1]{{\latintext #1}}
%    \end{macrocode}
%  \end{macro}
%  \end{macro}
%
%  \begin{macro}{\textol}
%    A last aspect of the set of fonts provided with this version of
%    support for typesetting Greek texts is that it contains an
%    outline font. In order to make it available we define the command
%    |\textol|.
%    \begin{macrocode}
\def\outlfamily{\usefont{LGR}{cmro}{m}{n}}
\DeclareTextFontCommand{\textol}{\outlfamily}
%    \end{macrocode}
%  \end{macro}
%
%    The next step consists of defining commands to switch to (and
%    from) the Greek language.
%
%  \begin{macro}{\greekhyphenmins}
%    This macro is used to store the correct values of the hyphenation
%    parameters |\lefthyphenmin| and |\righthyphenmin|.
%    \begin{macrocode}
\def\greekhyphenmins{23}
%    \end{macrocode}
%  \end{macro}
%
% \begin{macro}{\captionsgreek}
%    The macro |\captionsgreek| defines all strings used in the
%    four standard documentclasses provided with \LaTeX.
%    \begin{macrocode}
\addto\captionsgreek{%
  \def\prefacename{Pr'ologoc}%
  \def\refname{Anafor'ec}%
  \def\abstractname{Per'ilhyh}%
  \def\bibname{Bibliograf'ia}%
  \def\chaptername{Kef'alaio}%
  \def\appendixname{Par'arthma}%
  \def\contentsname{Perieq'omena}%
  \def\listfigurename{Kat'alogoc Sqhm'atwn}%
  \def\listtablename{Kat'alogoc Pin'akwn}%
  \def\indexname{Euret'hrio}%
  \def\figurename{Sq'hma}%
  \def\tablename{P'inakac}%
  \def\partname{M'eroc}%
  \def\enclname{Sunhmm'ena}%
  \def\ccname{Koinopo'ihsh}%
  \def\headtoname{Proc}%
  \def\pagename{Sel'ida}%
  \def\seename{bl'epe}%
  \def\alsoname{bl'pe ep'ishc}%
  }
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\dategreek}
%    The macro |\dategreek| redefines the command |\today| to
%    produce greek dates.
%    \begin{macrocode}
\def\dategreek{%
  \def\today{\number\day \space%
    \ifcase\month\or
    Ianouar'iou\or Febrouar'iou\or Mart'iou\or April'iou\or
    Ma'"iou\or Ioun'iou\or Ioul'iou\or Augo'ustou\or
    Septembr'iou\or Oktobr'iou\or Noembr'iou\or Dekembr'iou\fi
    \space \number\year}}
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\extrasgreek}
% \begin{macro}{\noextrasgreek}
%    The macro |\extrasgreek| will perform all the extra
%    definitions needed for the Greek language. The macro
%    |\noextrasgreek| is used to cancel the actions of
%    |\extrasgreek|.  For the moment these macros switch the
%    fontencoding used and the definition of the internal macros
%    |\@alph| and |\@Alph| because the greek alpabetisation differs
%    considerably from the roman alpabetisation..
%
%    \begin{macrocode}
\addto\extrasgreek{\greektext}
\addto\noextrasgreek{\latintext}
%    \end{macrocode}
% \end{macro}
% \end{macro}
%
%  \begin{macro}{\greek@alph}
%  \begin{macro}{\greek@Alph}
%    With the latin transcription used to create documents that will
%    be typeset in the greek language we need to adopt the
%    alphabetisation considerably. Therefore we have to redefine the
%    internal \LaTeX\ commands |\@alph| and |\@Alph|.
%
%    We need to be able to switch between the original definitions and
%    the greek ones, so we first `save' the orginal definitions.
%    \begin{macrocode}
\let\latin@alph\@alph
\let\latin@Alph\@Alph
%    \end{macrocode}
%    Then we define the greek versions
%    \begin{macrocode}
\def\greek@alph#1{%
  \ifcase #1\or a\or b\or g\or d\or e\or st\or z\or h\or j\or i\or
    ia\or ib\or ig\or id\or ie\or ist\or iz\or ih\or ij\or k\or ka\or
    kb\or kg\or \kd \or ke\or kst
  \else
    \@ctrerr
  \fi
  $'$}
\def\greek@Alph#1{%
   \ifcase #1\or A\or B\or G\or D\or E\or St\or Z\or H\or J\or I\or
    IA\or IB\or IG\or ID\or IE\or IST\or IZ\or IH\or IJ\or K\or KA\or
    KB\or KG\or \KD \or KE\or KST
  \else
    \@ctrerr
  \fi
  $'$}
%    \end{macrocode}
%    Now we can set up the switching.
%    \begin{macrocode}
\addto\extrasgreek{%
  \let\@alph\@greek@alph
  \let\@Alph\@greek@Alph}
\addto\noextrasgreek{%
  \let\@alph\latin@alph
  \let\@Alph\latin@Alph}
%    \end{macrocode}
%  \end{macro}
%  \end{macro}
%
%  \begin{macro}{\greek@roman}
%  \begin{macro}{\greek@Roman}
%    To prevent roman numerals being typeset in greek letters we need
%    to adopt the internal \LaTeX\ commands |\@roman| and |\@Roman|.
%    \begin{macrocode}
\let\latin@roman\@roman
\let\latin@Roman\@Roman
\def\greek@roman#1{\textlatin{\latin@roman{#1}}}
\def\greek@Roman#1{\textlatin{\latin@Roman{#1}}}
\addto\extrasgreek{%
  \let\@roman\@greek@roman
  \let\@Roman\@greek@Roman}
\addto\noextrasgreek{%
  \let\@roman\latin@roman
  \let\@Roman\latin@Roman}
%    \end{macrocode}
%  \end{macro}
%  \end{macro}
%
%    We provide access to a few extra greek characters. They are only
%    available in one particular font, therefore we first define a
%    `helper' macro to select the correct font.
%    \begin{macrocode}
\def\greek@char#1{{%
    \fontfamily\rmdefault
    \fontseries\mddefault
    \fontshape\scdefault
    \selectfont\char#1}}
%    \end{macrocode}
%    
%    \begin{macrocode}
\DeclareTextCommand{\tao}{LGR}{\greek@char{"7F}}
\DeclareTextCommand{\Qoppa}{LGR}{\greek@char{"43}}
\DeclareTextCommand{\qoppa}{LGR}{\greek@char{"5B}}
\DeclareTextCommand{\varqoppa}{LGR}{\greek@char{"5C}}
\DeclareTextCommand{\Sampi}{LGR}{\greek@char{"5F}}
\DeclareTextCommand{\sampi}{LGR}{\greek@char{"5E}}
\DeclareTextCommand{\Digamma}{LGR}{\greek@char{"17}}
%    \end{macrocode}
%    The amssymb package defines a |\digamma| command, so in order to
%    avoid problems we spell here digamma intentionally erroneous with
%    a double d.
%    \begin{macrocode}
\DeclareTextCommand{\ddigamma}{LGR}{\greek@char{"60}}
\DeclareTextCommand{\vardigamma}{LGR}{\greek@char{"5D}}
%    \end{macrocode}
%
%    Now make sure that these commands can also be used outside of the
%    greek font encoding.
%    \begin{macrocode}
\ProvideTextCommandDefault{\tao}{\UseTextSymbol{LGR}{\tao}}
\ProvideTextCommandDefault{\Qoppa}{\UseTextSymbol{LGR}{\Qoppa}}
\ProvideTextCommandDefault{\qoppa}{\UseTextSymbol{LGR}{\qoppa}}
\ProvideTextCommandDefault{\varqoppa}{\UseTextSymbol{LGR}{\varqoppa}}
\ProvideTextCommandDefault{\Sampi}{\UseTextSymbol{LGR}{\Sampi}}
\ProvideTextCommandDefault{\sampi}{\UseTextSymbol{LGR}{\sampi}}
\ProvideTextCommandDefault{\Digamma}{\UseTextSymbol{LGR}{\Digamma}}
\ProvideTextCommandDefault{\ddigamma}{\UseTextSymbol{LGR}{\ddigamma}}
\ProvideTextCommandDefault{\vardigamma}{%
  \UseTextSymbol{LGR}{\vardigamma}}
%    \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.
% \changes{greek-1.0b}{1996/11/02}{Now use \cs{ldf@finish} to wrap up}
%    \begin{macrocode}
\ldf@finish{greek}
%</code>
%    \end{macrocode}
%
% \Finale
%\endinput
%% \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         \~}
%%