% cjkutf8-josa.sty
%
% Copyright (c) 2016-2024 Dohyun Kim <nomos at ktug org>
%
% This program is free software; you can redistribute it and/or modify
% it under the terms of the GNU General Public License as published by
% the Free Software Foundation; either version 2 of the License, or
% (at your option) any later version.
%
% This program 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.  See the
% GNU General Public License for more details.
%
% You should have received a copy of the GNU General Public License
% along with this program in doc/COPYING; if not, write to the Free
% Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
% MA 02110-1301 USA

\ProvidesPackage{cjkutf8-josa}[2024/03/01 v2.5 Automatic Josa selection for cjk-ko]

\ifx\use@josa\undefined\else
  % redefine \@setref
  \AddToHookWithArguments{cmd/@setref/after}{%
    \ifx#1\relax\else
      \cjkko@prepare@josa@str{\expandafter#2#1}%
    \fi }
  % redefine \@cite@ofmt
  \AtBeginDocument{
    \let\CJKKO@orig@cite@ofmt\@cite@ofmt
    \def\@cite@ofmt#1{\CJKKO@orig@cite@ofmt{#1}%
      \bgroup
      \let\@safe@activesfalse\@empty % babel ?
      \def\hyper@@link[##1]##2##3##4{##4}%
      \def\beamer@sort##1##2{}%
      \def\hyperlink##1##2{##2}% for beamer: not from kotexutf
      \cjkko@prepare@josa@str{#1}%
      \egroup}}
  % partially support biblatex's \cite
  \AddToHook{package/biblatex/after}{%
    \renewrobustcmd*{\blx@imc@printfield}[2][]{%
      \blx@imc@iffieldundef{#2}
        {\blx@nounit}
        {\blx@getformat\blx@theformat{ffd}{#1}{#2}%
         \ifdefvoid\blx@theformat
           {\blx@nounit}
           {\blx@begunit
            \edef\currentfield{#2}%
            \expandafter\expandafter
            \expandafter\blx@theformat
            \expandafter\expandafter
            \expandafter{\csname abx@field@#2\endcsname}%
                    \cjkko@prepare@josa@str{\csname abx@field@#2\endcsname}%
            \blx@endunit}}}}
\fi

\AddToHook{package/hyperref/after}{\g@addto@macro\pdfstringdefPreHook{%
  \let\jong\relax
  \let\rieul\relax
  \let\jung\relax
  \def\^^ea{^^ea}%
  \def\^^eb{^^eb}%
  \def\^^ec{^^ec}%
}}

% support hangul syllables (0xAC00..0xD7A3)
\def\cjkko@josa@ea{\cjkko@josa@hangul@syllableS{"EA}}
\def\cjkko@josa@eb{\cjkko@josa@hangul@syllableS{"EB}}
\def\cjkko@josa@ec{\cjkko@josa@hangul@syllableS{"EC}}
\def\cjkko@josa@ed{\cjkko@josa@hangul@syllableS{"ED}}
\def\cjkko@josa@hangul@syllableS#1#2#3{%
  \expandafter\cjkko@josa@hangul@syllable\expandafter{%
    \number\numexpr (#1 - 224) * 4096 + (`#2 - 128) * 64 + (`#3 - 128) - "AC00\relax }}
\def\cjkko@josa@hangul@syllable#1{%
  \ifnum#1<\z@ \else \ifnum#1>11171 \else
    \expandafter\cjkko@josa@hangul@syllable@\expandafter{%
      \number\numexpr #1 - (((#1 + 14) / 28 - 1) * 28)\relax }% we need floor, not round
  \fi\fi
}
\def\cjkko@josa@hangul@syllable@#1{%
  \ifnum#1=\z@
    2\else \ifnum#1=8 %
    1\else
    0\fi\fi
}

\def\cjkko@prepare@josa@str#1{%
  \ifx\protect\relax
    \begingroup
      \let^^ea\cjkko@josa@ea
      \let^^eb\cjkko@josa@eb
      \let^^ec\cjkko@josa@ec
      \let^^ed\cjkko@josa@ed
      \let\protect\noexpand
      \xdef\josa@str{#1}%
    \endgroup
  \fi
}

%%% user commands: \jong \jung \rieul
\protected\def\jong {\global\let\josa@str\empty\global\chardef\@josa\z@ }
\protected\def\rieul{\global\let\josa@str\empty\global\chardef\@josa\@ne}
\protected\def\jung {\global\let\josa@str\empty\global\chardef\@josa\tw@}
\jung

\def\cjkko@josa@str@end{cjkko@josa@str@end}

\def\makejosa{%
  \bgroup
  \expandafter\make@josa\josa@str\cjkko@josa@str@end
  \expandafter\egroup
  \expandafter\count@\number\@josa\relax
  \jung
  \make@@@josa
}

\begingroup
\catcode`a=11 \global\let\cjkko@cat@letter=a\relax
\catcode`0=12 \global\let\cjkko@cat@other=0\relax
\endgroup

\def\make@josa{\afterassignment\make@@josa\let\@let@token= }
\def\make@@josa{%
  \ifx\@let@token\cjkko@josa@str@end
  \else
    \ifx\@let@token 1\rieul\else
    \ifx\@let@token 3\jong \else
    \ifx\@let@token 6\jong \else
    \ifx\@let@token 7\rieul\else
    \ifx\@let@token 8\rieul\else
    \ifx\@let@token 0\jong \else
    \ifx\@let@token l\rieul\else
    \ifx\@let@token m\jong \else
    \ifx\@let@token n\jong \else
    \ifx\@let@token L\rieul\else
    \ifx\@let@token M\jong \else
    \ifx\@let@token N\jong \else
    \ifcat\noexpand\@let@token\cjkko@cat@other \jung\else
    \ifcat\noexpand\@let@token\cjkko@cat@letter\jung\else
    \ifx\@let@token ^^c2\jung \else
    \ifx\@let@token ^^c3\jung \else
    \ifx\@let@token\jong \jong\else
    \ifx\@let@token\jung \jung\else
    \ifx\@let@token\rieul\rieul
    \fi\fi\fi\fi\fi \fi\fi\fi\fi\fi \fi\fi\fi\fi\fi \fi\fi\fi\fi
    \expandafter\make@josa
  \fi}

\def\make@@@josa{%
  \ifcase\count@
    \expandafter\@secondoftwo
  \or
    \expandafter\make@@@@josa
  \else
    \expandafter\@firstoftwo
  \fi
}
\def\make@@@@josa#1{%
  \ifx\empty#1\empty
    \expandafter\@gobble
  \else
    \expandafter\@firstofone
  \fi
}

\def\error@josa{\PackageError{cjkutf8-josa}{Undefined Control Sequence}{}}
\def\makejosa@ga@i{\makejosa{가}{이}}
\def\makejosa@wa@gwa{\makejosa{와}{과}}
\def\makejosa@neun@eun{\makejosa{는}{은}}
\def\makejosa@ra@ira{\makejosa{라}{이라}}
\def\makejosa@empty@eu@ro{\makejosa{}{으}로}
\def\makejosa@reul@eul{\makejosa{를}{을}}
\def\makejosa@empty@eu{\makejosa{}{으}}
\def\makejosa@relax@i{\makejosa\relax{이}}

\DeclareRobustCommand*\^^ea[2]{%
  \ifx#1^^b0\ifx#2^^80\let\do@makejosa\makejosa@ga@i % \가
    \else\let\do@makejosa\error@josa \fi
  \else\ifx#1^^b3\ifx#2^^bc\let\do@makejosa\makejosa@wa@gwa % \과
    \else\let\do@makejosa\error@josa \fi
  \else\let\do@makejosa\error@josa \fi\fi
  \do@makejosa}
\DeclareRobustCommand*\^^eb[2]{%
  \ifx#1^^8a\ifx#2^^94\let\do@makejosa\makejosa@neun@eun % \는
    \else\let\do@makejosa\error@josa \fi
  \else\ifx#1^^9d\ifx#2^^bc\let\do@makejosa\makejosa@ra@ira % \라
    \else\let\do@makejosa\error@josa \fi
  \else\ifx#1^^a1\ifx#2^^9c\let\do@makejosa\makejosa@empty@eu@ro % \로
    \else\let\do@makejosa\error@josa \fi
  \else\ifx#1^^a5\ifx#2^^bc\let\do@makejosa\makejosa@reul@eul % \를
    \else\let\do@makejosa\error@josa \fi
  \else\let\do@makejosa\error@josa \fi\fi\fi\fi
  \do@makejosa}
\DeclareRobustCommand*\^^ec[2]{%
  \let\reserved@a#1\let\reserved@b#2%
  \futurelet\@let@token\@josa@begin@ec}
\def\@josa@begin@ec{%
  \ifx\reserved@a^^99\ifx\reserved@b^^80\let\do@makejosa\makejosa@wa@gwa % \와
    \else\let\do@makejosa\error@josa \fi
  \else\ifx\reserved@a^^9c\ifx\reserved@b^^bc\let\do@makejosa\makejosa@empty@eu % \으로
    \else\let\do@makejosa\error@josa \fi
  \else\ifx\reserved@a^^9d%
    \ifx\reserved@b^^80\let\do@makejosa\makejosa@neun@eun % \은
    \else\ifx\reserved@b^^84\let\do@makejosa\makejosa@reul@eul % \을
    \else\ifx\reserved@b^^b4%
      \ifx\@let@token^^ea\let\do@makejosa\makejosa@relax@i % \이라
      \else\ifx\@let@token^^eb\let\do@makejosa\makejosa@relax@i % \이라
      \else\ifx\@let@token^^ec\let\do@makejosa\makejosa@relax@i % \이라
      \else\ifx\@let@token^^ed\let\do@makejosa\makejosa@relax@i % \이라
      \else\let\do@makejosa\makejosa@ga@i % \이
      \fi\fi\fi\fi
    \else\let\do@makejosa\error@josa \fi\fi\fi
  \else\let\do@makejosa\error@josa \fi\fi\fi
  \do@makejosa}

\endinput