% \iffalse meta-comment
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% Copyright 2013-2014 Javier Bezos and any individual authors
% listed elsewhere in this file.  All rights reserved.
% 
% This file is part of the Babel system.
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% \fi
% \CheckSum{795}
%
% \iffalse
%<*dtx>
\ProvidesFile{bbunicode.dtx}
       [2014/03/21 v1.0d Babel hooks for Unicode engines]
%</dtx>
%
%% File `bbunicode.dtx'
%% Babel package for LaTeX version 2e
%% Copyright (C) 2103-2014
%%           by Javier Bezos
%
%<*filedriver>
\documentclass{ltxdoc}
\font\manual=logo10 % font used for the METAFONT logo, etc.
\newcommand*\MF{{\manual META}\-{\manual FONT}}
\newcommand*{\babel}{\textsf{babel}}
\newcommand*{\langvar}{$\langle \it lang \rangle$}
\newcommand*{\note}[1]{}
\newcommand*{\pkg}[1]{\textsf{#1}}
\newcommand*{\Lopt}[1]{\textsf{#1}}
\newcommand*{\file}[1]{\texttt{#1}}
\begin{document}
 \DocInput{bbunicode.dtx}
\end{document}
%</filedriver>
% \fi
%
% \GetFileInfo{bbunicode.dtx}
% \StopEventually{}
%
% \section{Tentative font handling}
%
% A general solution is far from trivial:
% \begin{itemize}
% \item |\addfontfeature| only sets it for the current family and it's
%   not very efficient, and
% \item |\defaultfontfeatures| requires to redefine the font (and the
%   opti\texttt{}ons aren't ``orthogonal'').
% \end{itemize}
%
%    \begin{macrocode}
%<<*Font selection>>
\def\babelFSstore#1{%
  \bbl@for\bbl@tempa{#1}{%
    \edef\bbl@tempb{\noexpand\bbl@FSstore{\bbl@tempa}}
    \bbl@tempb{rm}\rmdefault\bbl@save@rmdefault
    \bbl@tempb{sf}\sfdefault\bbl@save@sfdefault
    \bbl@tempb{tt}\ttdefault\bbl@save@ttdefault}}
\def\bbl@FSstore#1#2#3#4{%
  \bbl@csarg\edef{#2default#1}{#3}%
  \expandafter\addto\csname extras#1\endcsname{%
    \let#4#3%
    \ifx#3\f@family
      \edef#3{\csname bbl@#2default#1\endcsname}%
      \fontfamily{#3}\selectfont
    \else
      \edef#3{\csname bbl@#2default#1\endcsname}%
    \fi}%
  \expandafter\addto\csname noextras#1\endcsname{%
    \ifx#3\f@family
      \fontfamily{#4}\selectfont
    \fi
    \let#3#4}}
\let\bbl@langfeatures\@empty
\def\babelFSfeatures{%
  \let\bbl@ori@fontspec\fontspec
  \renewcommand\fontspec[1][]{%
    \bbl@ori@fontspec[\bbl@langfeatures##1]}
  \let\babelFSfeatures\bbl@FSfeatures
  \babelFSfeatures}
\def\bbl@FSfeatures#1#2{%
  \expandafter\addto\csname extras#1\endcsname{%
    \babel@save\bbl@langfeatures
    \edef\bbl@langfeatures{#2,}}}
%<</Font selection>>
%    \end{macrocode}
%    \section{Hooks for XeTeX and LuaTeX}
%
%    \subsection{XeTeX}
%
%    Unfortunately, the current encoding cannot be retrieved and
%    therefore it is reset always to |utf8|, which seems a sensible
%    default.
%
%    \LaTeX{} sets many ``codes'' just before loading
%    \verb|hyphen.cfg|. That is not a problem in luatex, but in xetex
%    they must be reset to the proper value. Most of the work is done in
%    \textsf{xe(la)tex.ini}, so here we just ``undo'' some of the
%    changes done by \LaTeX. Anyway, for consistency Lua\TeX{} also
%    resets the catcodes. 
% \changes{bbunicode~1.0c}{2014/03/10}{Reset ``codes'' set by \cs{LaTeX}
%    to what xetex expects. Used also in luatex.}
%    \begin{macrocode}
%<<*Restore Unicode catcodes before loading patterns>>
\AddBabelHook{xetex}{loadkernel}{%
  \begingroup
      % Reset chars "80-"C0 to category "other", no case mapping:
    \catcode`\@=11 \count@=128
    \loop\ifnum\count@<192
      \global\uccode\count@=0 \global\lccode\count@=0
      \global\catcode\count@=12 \global\sfcode\count@=1000
      \advance\count@ by 1 \repeat
      % Other:
    \def\O ##1 {%
      \global\uccode"##1=0 \global\lccode"##1=0
      \global\catcode"##1=12 \global\sfcode"##1=1000 }%
      % Letter:
    \def\L ##1 ##2 ##3 {\global\catcode"##1=11
      \global\uccode"##1="##2
      \global\lccode"##1="##3
      % Uppercase letters have sfcode=999:
      \ifnum"##1="##3 \else \global\sfcode"##1=999 \fi }%
      % Letter without case mappings:
    \def\l ##1 {\L ##1 ##1 ##1 }%
    \l 00AA
    \L 00B5 039C 00B5
    \l 00BA
    \O 00D7
    \l 00DF
    \O 00F7
    \L 00FF 0178 00FF
  \endgroup
  \input #1\relax}
%<</Restore Unicode catcodes before loading patterns>>
%    \end{macrocode}
%
% Now, the code.
%
%    \begin{macrocode}
%<*xetex>
\def\BabelStringsDefault{unicode}
\let\xebbl@stop\relax
\AddBabelHook{xetex}{encodedcommands}{%
  \def\bbl@tempa{#1}%
  \ifx\bbl@tempa\@empty
    \XeTeXinputencoding"bytes"%
  \else
      \XeTeXinputencoding"#1"%
  \fi
  \def\xebbl@stop{\XeTeXinputencoding"utf8"}}
\AddBabelHook{xetex}{stopcommands}{%
  \xebbl@stop
  \let\xebbl@stop\relax}
<@Restore Unicode catcodes before loading patterns@>
<@Font selection@>
%</xetex>
%    \end{macrocode}
%    \subsection{LuaTeX}
%
%    This part relies on the |lua| stripts in \pkg{luatex-hyphen} by Khaled
%    Hosny, \'{E}lie Roux, and Manuel
%    P\'{e}gouri\'{e}-Gonnard. \'{E}lie also improved the code below.
% \changes{bbunicode~1.0b}{2013/04/22}{luatex-hyphen is loaded
%    with require. Changes supplied by \'{E}lie Roux.}
% \changes{bbunicode~1.0c}{2014/03/10}{Defined hook for
%   `initiateactive', to fetch the next token and continue only if
%   letter or other}
% \changes{bbunicode~1.0d}{2014/03/21}{Removed the `misfeature' for
%   `initiateactive'}
%
%    \begin{macrocode}
%<*luatex>
\directlua{%
  require("luatex-hyphen")
  Babel = {}
  function Babel.bytes(line)
    return line:gsub("(.)",
      function (chr) return unicode.utf8.char(string.byte(chr)) end)
  end
  function Babel.begin_process_input()
    if luatexbase and luatexbase.add_to_callback then
      luatexbase.add_to_callback('process_input_buffer',Babel.bytes,'Babel.bytes')
    else
      Babel.callback = callback.find('process_input_buffer')
      callback.register('process_input_buffer',Babel.bytes)
    end
  end
  function Babel.end_process_input ()
    if luatexbase and luatexbase.remove_from_callback then
      luatexbase.remove_from_callback('process_input_buffer','Babel.bytes')
    else
      callback.register('process_input_buffer',Babel.callback)
    end
  end
}
\def\BabelStringsDefault{unicode}
\let\luabbl@stop\relax
\AddBabelHook{luatex}{encodedcommands}{%
  \def\bbl@tempa{utf8}\def\bbl@tempb{#1}%
  \ifx\bbl@tempa\bbl@tempb\else
    \directlua{Babel.begin_process_input()}%
    \def\luabbl@stop{%
      \directlua{Babel.end_process_input()}}%
  \fi}%
\AddBabelHook{luatex}{stopcommands}{%
  \luabbl@stop
  \let\luabbl@stop\relax}
\AddBabelHook{luatex}{patterns}{%
  \ifx\directlua\relax\else
    \ifcsname lu@texhyphen@loaded@\the\language\endcsname \else
      \global\@namedef{lu@texhyphen@loaded@\the\language}{}%
      \directlua{
        luatexhyphen.loadlanguage('\luatexluaescapestring{\string#1}',
          '\the\language')}%
    \fi
  \fi}
\AddBabelHook{luatex}{adddialect}{%
  \ifx\directlua\relax\else
    \directlua{
      luatexhyphen.adddialect('\luatexluaescapestring{\string#1}', 
        '\luatexluaescapestring{\string#2}')
    }%
  \fi}
\AddBabelHook{luatex}{everylanguage}{%
  \directlua{
    processnow = (tex.language == 0) or
      (luatexhyphen.lookupname('\luatexluaescapestring{\string#1}') == nil)}%
  \ifnum0=\directlua{tex.sprint(processnow and "0" or "1")}\relax
    \global\@namedef{lu@texhyphen@loaded@\the\language}{}%
  \fi}
\AddBabelHook{luatex}{loadpatterns}{%
  \ifnum0=\directlua{tex.sprint(processnow and "0" or "1")}\relax
    \input #1\relax
  \fi}
\AddBabelHook{luatex}{loadexceptions}{%
  \ifnum0=\directlua{tex.sprint(processnow and "0" or "1")}\relax
    \input #1\relax
  \fi
  \directlua{processnow = nil}}
<@Restore Unicode catcodes before loading patterns@>
<@Font selection@>
%</luatex>
%    \end{macrocode}
%
\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         \~}