% This is the file CJK.sty of the CJK package
%   for using Asian logographs (Chinese/Japanese/Korean) with LaTeX2e
%
% created by Werner Lemberg <wl@gnu.org>
%
% Version 4.8.5 (16-Oct-2021)

% Copyright (C) 1994-2021  Werner Lemberg <wl@gnu.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

\NeedsTeXFormat{LaTeX2e}[2001/06/01]
\def\fileversion{4.8.5}
\def\filedate{2021/10/16}
\ProvidesPackage{CJK}[\filedate\space\fileversion]

\RequirePackage{MULEenc}

\newif\ifCJK@lowercase@
\CJK@lowercase@false
\DeclareOption{lowercase}{\CJK@lowercase@true}

\DeclareOption{global}{\let\CJK@global \global
                       \let\CJK@active \global
                       \let\CJK@local  \global}
\DeclareOption{local}{\let\CJK@global \relax
                      \let\CJK@active \global
                      \let\CJK@local  \global}
\DeclareOption{active}{\let\CJK@global \relax
                       \let\CJK@active \relax
                       \let\CJK@local  \global}
\DeclareOption{encapsulated}{\let\CJK@global \relax
                             \let\CJK@active \relax
                             \let\CJK@local  \relax}

\ExecuteOptions{local}

\ProcessOptions


% we suppress any unwanted spaces produced by linefeeds.

\endlinechar \m@ne


% the use of the internal LaTeX macro `\@ifundefined' can be slightly
%     irritating. After it has been called, the tested macro is no
%     longer undefined but expands to \relax. Where possible, we use
%     the following macro which doesn't have this side effect.

\def\CJK@ifundefined#1{
  \ifx #1\@undefined
    \expandafter\@firstoftwo
  \else
    \expandafter\@secondoftwo
  \fi
}


% our input macro. For compatibility with ArabTeX, the catcode of `<'
%     is preserved.

\def\CJK@input#1{
  \makeatletter
  \edef\CJK@lesscatcode{\noexpand\catcode`< \the\catcode`<}
  \catcode`\< 12\relax
  \endlinechar \m@ne
  \input #1\relax
  \endlinechar `\^^M
  \CJK@lesscatcode
  \makeatother}


% our symbol macro. It honours the \ifCJK@bold@ flag (to be set in the .fd
%     files) for producing poor-man's bold fonts; if it is raised we print
%     the character three times with a small horizontal shift.
%
% The user commands to set and unset \ifCJK@bold@ are \CJKbold and
%     \CJKnormal respectively.
%
% \CJKboldshift defines the shift used to imitate bold fonts.

\newif\ifCJK@bold@
\newcommand{\CJKbold}{\global\CJK@bold@true}
\newcommand{\CJKnormal}{\global\CJK@bold@false}
\newcommand{\CJKboldshift}{0.015em}

\DeclareRobustCommand{\CJKsymbol}[1]{
  \symbol{#1}
  \ifCJK@bold@
    \hbox to \CJKboldshift{\hss\symbol{#1}}
    \hbox to \CJKboldshift{\hss\symbol{#1}}
  \fi}
\let\CJKpunctsymbol\CJKsymbol

% the same for HLaTeX which uses the ligature mechanism

\DeclareRobustCommand{\CJKsymbols}[2]{
  \char #1\char #2\relax
  \ifCJK@bold@
    \hbox to \CJKboldshift{\hss\char #1\char #2}
    \hbox to \CJKboldshift{\hss\char #1\char #2}
  \fi}


% the auxiliary macro \CJK@numbToHex converts number #2 into a two-digit
%     hex string and assigns it globally to #1.

\def\CJK@numbToHex#1#2{
  {\count\z@ #2\relax
   \count\tw@ \count\z@
   \divide\count\z@ \sixt@@n

   \count@ \count\z@
   \multiply\count@ \sixt@@n
   \advance\count\tw@ -\count@

   \xdef#1{
     \hexnumber@{\count\z@}\hexnumber@{\count\tw@}}}}


% the auxiliary macro \CJK@numbxToHex converts number #2 into a four-digit
%     hex string and assigns it globally to #1.

\def\CJK@numbxToHex#1#2{
  {\count\thr@@ #2\relax
   \count\tw@ \count\thr@@
   \divide\count\tw@ \sixt@@n
   \count\@ne \count\tw@
   \divide\count\@ne \sixt@@n
   \count\z@ \count\@ne
   \divide\count\z@ \sixt@@n

   \count@ \count\tw@
   \multiply\count@ \sixt@@n
   \advance\count\thr@@ -\count@
   \count@ \count\@ne
   \multiply\count@ \sixt@@n
   \advance\count\tw@ -\count@
   \count@ \count\z@
   \multiply\count@ \sixt@@n
   \advance\count\@ne -\count@

   \xdef#1{
     \hexnumber@{\count\z@}
     \hexnumber@{\count\@ne}
     \hexnumber@{\count\tw@}
     \hexnumber@{\count\thr@@}}}}


% the encoding of the `UTF8' environment.

\edef\CJK@UnicodeEnc{UTF8}


% with \CJKchar you can access a character directly at a low level:
%     the parameters are the first and the second byte of the CJK character
%     code. The second parameter will be ignored if you address one-byte
%     encoded characters in SJIS.
%
% the optional parameter selects the encoding (using \CJKenc).
%
% for Unicode characters you must select UTF-8 encoding (but enter real
%     Unicode values).
%
% you can enter character codes with or without the 8th bit set (GL or
%     GR form) except for SJIS, Bg5 and UTF-8 encodings.

\DeclareRobustCommand{\CJKchar}[3][]{
  {\CJK@nobind@true

   \edef\CJK@tempenc{#1}
   \ifx\CJK@tempenc \@empty
   \else
     \let\CJK@oldenc \CJK@@@enc
     \CJKenc{#1}
   \fi

   \edef\CJK@temp{UTF8}
   \ifx\CJK@temp \CJK@@@enc
     \Unicode{#2}{#3}
   \else
     \@tempcnta #2
     \edef\CJK@tempa{#3}
     \ifx\CJK@tempa \@empty%            % test for one-byte SJIS characters
     \else
       \@tempcntb #3
       \ifnum \CJK@min > 160\relax
         \ifnum\@tempcnta < 128\relax
           \advance\@tempcnta 128\relax
           \advance\@tempcntb 128\relax
         \fi
       \fi
       \edef\CJK@tempa{\the\@tempcntb}
     \fi

     \edef\CJK@temp{\the\@tempcnta}
     \expandafter\csname CJK@\CJK@temp\expandafter\endcsname
      \expandafter{\CJK@tempa}
   \fi

   \ifx\CJK@tempenc \@empty
   \else
     \ifx\CJK@global \global
       \CJKenc{\CJK@oldenc}
     \fi
   \fi}

  \CJK@ignorespaces}


% with \Unicode you can access a Unicode character directly at a low level:
%     the parameters are the first and the second byte of the Unicode (real
%     Unicode values, not UTF-8).
%
%     If the Unicode value is greater than U+FFFF, put the first two bytes
%     into #1, and the third byte into #2.

\DeclareRobustCommand{\Unicode}[2]{
  {\edef\CJK@temp{UTF8}
   \ifx\CJK@temp \CJK@@@enc
   \else
     \PackageError{CJK}{
       You can't use \protect\Unicode\space here}{
       You must activate UTF-8 encoding to use \protect\Unicode.}
   \fi
   \ifnum #1 > 255\relax
     \CJK@numbxToHex{\CJK@gtemp}{#1}
   \else
     \CJK@numbToHex{\CJK@gtemp}{#1}
   \fi
   \def\CJK@tempa##1{
     \lowercase{\edef\CJK@plane{##1}}}
   \expandafter\CJK@tempa\expandafter{\CJK@gtemp}
   \usefont{\CJK@enc}{\CJK@family}{\CJK@series}{\CJK@shape}

   \edef\CJK@tempa{
     \curr@fontshape/\CJK@plane/\number #2/\CJK@direction}
   \expandafter\ifx\csname\CJK@tempa\endcsname \relax
     \def\CJKtemp{\CJKsymbol{#2}}
   \else
     \def\CJKtemp{\csname\CJK@tempa\endcsname}
   \fi

   \ifCJK@latin@
     \CJKtemp
   \else
     \expandafter\CJK@testInList\expandafter\CJK@uniPunct
      \expandafter{\CJK@plane}
     \ifCJK@%                                   % punctuation character
       \CJK@numbToHex{\CJK@gtemp}{#2}
       \CJK@testLastCJK
       \ifCJK@
         \CJK@testPostPunct{\CJK@@@enc}{\CJK@plane}{\CJK@gtemp}
         \ifCJK@
           \ifCJK@CJK@
             \CJK@nobreakglue
           \fi
         \else
           \ifCJK@hangul@
             \discretionary{}{}{}
           \else
             \CJKglue
           \fi
         \fi
       \fi
       \ifCJK@CJK@
         \CJK@testLastKern
         \ifCJK@
           \CJK@nobreakglue
         \fi
       \fi

       \CJKtemp

       \CJK@testPrePunct{\CJK@@@enc}{\CJK@plane}{\CJK@gtemp}
       \ifCJK@
         \CJK@kern
       \else
         \CJK@CJK
       \fi
     \else%                                     % not a punctuation character
       \CJK@testLastCJK
       \ifCJK@
         \ifCJK@hangul@
           \discretionary{}{}{}
         \else
           \CJKglue
         \fi
       \fi
       \ifCJK@CJK@
         \CJK@testLastKern
         \ifCJK@
           \CJK@nobreakglue
         \fi
       \fi
       \CJKtemp
       \CJK@CJK
     \fi
   \fi}

  \CJK@ignorespaces}


% the following commands are needed for UTF-8 encoding to select the proper
%     intercharacter glue.

\newif\ifCJK@CJK@
\newif\ifCJK@hangul@
\newif\ifCJK@latin@

\newcommand{\CJKCJKchar}{
  \CJK@global\CJK@CJK@true
  \CJK@global\CJK@hangul@false
  \CJK@global\CJK@latin@false}

\newcommand{\CJKhangulchar}{
  \CJK@global\CJK@CJK@false
  \CJK@global\CJK@hangul@true
  \CJK@global\CJK@latin@false}

\newcommand{\CJKlatinchar}{
  \CJK@global\CJK@CJK@false
  \CJK@global\CJK@hangul@false
  \CJK@global\CJK@latin@true}

\CJKCJKchar


% the next commands control mapping of half-width katakana to full-width
%     glyphs within SJIS encoding.

\newif\ifCJK@hwkatakana@

\newcommand{\CJKhwkatakana}{\CJK@global\CJK@hwkatakana@true}

\newcommand{\CJKnohwkatakana}{\CJK@global\CJK@hwkatakana@false}

\CJKhwkatakana


% you will find the innermost routines of the macros defined above in the
%     xxx.chr files. These routines are
%
%         \CJK@char, \CJK@charx,
%         \CJK@altchar, \CJK@altcharx,
%         \CJK@punctchar, \CJK@punctcharx,
%         \CJK@sjischar, \CJK@sjispunctchar    .


% we need to scan comma separated lists of character codes (represented as
%     hexadecimal strings), testing whether a particular character is in the
%     list. The macro \CJK@testInList sets the flag \ifCJK@ globally if true.
%     Parameter #1 is the list, #2 the actual character code to test.
%
% see the documentation of the \ifnot@excluded macro in the doc package of
%     the standard LaTeX2e distribution for a detailed explanation of the
%     following tricky definitions.

\newif\ifCJK@

\def\CJK@stop{\CJK@stop}

\def\CJK@testInList#1#2{
  \def\CJK@tempa##1,#2,##2\CJK@stop{
    \def\CJK@tempb{##2}
    \global\CJK@true
    \ifx\CJK@tempb \@empty
      \global\CJK@false
    \fi}
  \expandafter\CJK@tempa\expandafter,#1,#2,\CJK@stop}


% lists defined in CJK.enc for plane yy with encoding xx are assigned to
%     global macros \CJK@xx@yy@prePunct and \CJK@xx@yy@postPunct.

\def\CJK@prePunct#1#2#3{
  \expandafter\gdef\csname CJK@#1@#2@prePunct\endcsname{#3}}

\def\CJK@postPunct#1#2#3{
  \expandafter\gdef\csname CJK@#1@#2@postPunct\endcsname{#3}}


% the next two functions scan the lists of punctuation characters of a
%     particular plane which should not occur at the beginning or at the end
%     of a line. They will be used in the xxx.chr files. Parameters are the
%     encoding, the plane and the character to be tested. Again these macros
%     raise or lower \ifCJK@.

\def\CJK@testPrePunct#1#2#3{
  \expandafter\expandafter\expandafter
   \CJK@testInList
   \expandafter\csname CJK@#1@#2@prePunct\expandafter\endcsname
   \expandafter{#3}}

\def\CJK@testPostPunct#1#2#3{
  \expandafter\expandafter\expandafter
   \CJK@testInList
   \expandafter\csname CJK@#1@#2@postPunct\expandafter\endcsname
   \expandafter{#3}}


% the macro \CJKenc changes the encoding inside of a CJK environment. It
%     always uses the fontencoding defined with \CJKfontenc (this
%     behaviour is intentionally different from the similar command pair
%     \CJKfamily and \CJKencfamily).

\DeclareRobustCommand{\CJKenc}[1]{
  \expandafter\ifx\csname CJK@#1@fontenc\endcsname \relax
    \PackageError{CJK}{
      Encoding `#1' is not defined}{}
  \fi

  \edef\CJK@temp{\csname CJK@#1@fontenc\endcsname}

  \expandafter\ifx\csname CJK@#1\CJK@temp @enc\endcsname \relax
    \PackageError{CJK}{
      Encoding `#1\CJK@temp' is not defined}{}
  \else
    \CJK@global\edef\CJK@@@enc{#1}
    \CJK@selectEnc
  \fi}

\edef\CJK@@@enc{}

% to change a fontencoding yyy for a specific encoding xxx say
%     \CJKfontenc{xxx}{yyy}. If you then change the encoding forth and back,
%     this fontencoding is still valid. You will need this command only in
%     cases where the fonts are not CJK-fontencoded, such as pmC or dnp
%     fontencodings.
%
% if you define a new encoding `foo', you *must* supply the command
%     `\CJKfontenc{foo}{}' (note the empty second parameter) since the
%     encoding existence test relies on this.

\DeclareRobustCommand{\CJKfontenc}[2]{
  \expandafter\CJK@global\expandafter\edef
   \csname CJK@#1@fontenc\endcsname{#2}
  \CJK@selectEnc}

% \CJKfamily{xxx} selects the shape xxx for all encodings. It will override
%     \CJKencfamily, i.e., if you change the encoding, the family will be
%     the same. To reactivate \CJKencfamily, say `\CJKfamily{}'.
%
% For backward compatibility the macros \CJKshape and \CJKencshape are set
%     to \CJKfamily and \CJKencfamily, respectively.

\DeclareRobustCommand{\CJKfamily}[1]{
  \CJK@global\edef\CJK@globalfamily{#1}
  \CJK@selectFamily}

\edef\CJK@globalfamily{}

% to change a family for a specific encoding xxx (and a font encoding yyy),
%     use \CJKencfamily. If you then change the encoding forth and back,
%     this family is still valid. This macro is especially useful with
%     cjk-enc.el since it allows to change the encoding without the need to
%     select a (possibly different) family each time. See the various
%     encoding definitions in CJK.enc for the default values.
%
% note that it is equivalent to say \CJKencfamily[yyy]{xxx}{...} and
%     \CJKencfamily{xxxyyy}{...}.

\DeclareRobustCommand{\CJKencfamily}[3][]{
  \expandafter\CJK@global\expandafter\edef
   \csname CJK@#2#1@family\endcsname{#3}
  \CJK@selectFamily}


\let\CJKshape \CJKfamily
\let\CJKencshape \CJKencfamily


% the next commands select the actual family and encoding.

\def\CJK@selFam{
  \edef\CJK@temp{\csname CJK@\CJK@@@enc @fontenc\endcsname}

  \ifx\CJK@globalfamily \@empty
    \CJK@global\edef\CJK@family{
     \csname CJK@\CJK@@@enc\CJK@temp @family\endcsname}
  \else
    \CJK@global\edef\CJK@family{\CJK@globalfamily}
  \fi}


% \CJK@@@enc is the encoding selected by the user, \CJK@enc will be really
%     used. With the internal hook \CJK@@@xxx@hook we can modify \CJK@enc
%     for the encoding xxx if necessary. With the hook \CJK@xxx@hook other
%     packages can add stuff which should be executed immediately after the
%     encoding has changed.

\def\CJK@selEnc{
  \edef\CJK@temp{\csname CJK@\CJK@@@enc @fontenc\endcsname}

  \CJK@global\edef\CJK@enc{
    \csname CJK@\CJK@@@enc\CJK@temp @nfssenc\endcsname}
  \csname CJK@@@\CJK@@@enc\CJK@temp @hook\endcsname

  \csname CJK@\CJK@@@enc\CJK@temp @enc\endcsname
  \CJK@selectFamily
  \csname CJK@\CJK@@@enc @hook\endcsname}

% and here the user-visible macro to add something to the encoding hook.
%     First parameter is the encoding, second parameter the data to be
%     appended.

\def\CJKaddEncHook#1#2{
  \expandafter\let\expandafter\CJK@temp \csname CJK@#1@hook\endcsname
  \expandafter\def\expandafter\CJK@temp\expandafter{
   \CJK@temp #2}
  \expandafter\let\csname CJK@#1@hook\endcsname \CJK@temp}


% we disable \CJK@selectFamily and \CJK@selectEnc until a CJK environment
%     starts to avoid side effects while defining default values for
%     encodings (outside of a CJK environment).

\let\CJK@selectFamily \relax
\let\CJK@selectEnc \relax


% CJK.enc contains the \CJK@...@enc macros and the punctuation lists.

\input CJK.enc


% the macros \CJK@testLastKern and \CJK@testLastCJK check the last kern and
%     raise or lower \ifCJK@.

\edef\CJK@kern{\kern -2sp\kern 2sp}
\edef\CJK@CJK{\kern -1sp\kern 1sp}

\let\CJKkern \CJK@kern

% does previous CJK character request nonbreakable glue?

\def\CJK@testLastKern{
  \global\CJK@false
  \ifnum\lastkern = \tw@
    \global\CJK@true
  \fi
  \ifnum\lastkern = 5%                          % request from ruby.sty
    \global\CJK@true
  \fi}

% is previous character a CJK character?

\def\CJK@testLastCJK{
  \global\CJK@false
  \ifnum\lastkern = \@ne
    \global\CJK@true
  \fi}


% we only check for lower and upper bounds, not for possible gaps in the
%     range of the second byte, as it happens for Big5 and SJIS encoding.

\def\CJK@err{
  \PackageError{CJK}{
    Invalid character code}{
    The second byte of the CJK code is out of range.\MessageBreak
    Do you use the right encoding scheme?}}

\def\CJK@errx{
  \PackageError{CJK}{
    Invalid character code}{
    The third byte of the CJK code is out of range.\MessageBreak
    Do you use the right encoding scheme?}}

\def\CJK@errxx{
  \PackageError{CJK}{
    Invalid character code}{
    The CJK code is out of range for this font encoding.\MessageBreak
    Do you use the right encoding scheme?}}


% we now define a set of new size functions:
%     `CJK', `sCJK', `CJKfixed', and `sCJKfixed' are similar to `' (empty),
%     `s', `fixed', and `sfixed' except that the value of \CJK@plane is
%     appended to \font@name.
%
% `CJKsub', `CJKssub' are similar to `sub' and `ssub' except that the font
%     substitution warning appears only once per CJK fontset.
%
% `CJKb', `sCJKb', `CJKfixedb', and `sCJKfixedb' are absolutely identical
%     to the functions without the final `b'; they just exist to overcome
%     a special feature of LaTeX:
%
%     consider this example:
%
%       \DeclareFontShape{C00}{kai}{m}{n}{<-> CJK * ntukai}{}
%       \DeclareFontShape{C00}{kai}{bx}{n}{<-> CJK * ntukai}{\CJKbold}
%
%     the internal name of the macro which executes the last parameter
%     (\CJKbold) is identical to the fifth parameter (without spaces), in
%     this case `<->CJK*ntukai' -- the same name for both font shapes! This
%     means that the latter font shape definition overwrites the former.
%     Thus we have to write
%
%       \DeclareFontShape{C00}{kai}{bx}{n}{<-> CJKb * ntukai}{\CJKbold}
%
%     to get a different internal macro name.

\def\CJK@curr@fontshape{CJK@\f@encoding/\f@family/\f@series/\f@shape}

\DeclareSizeFunction{CJK}{\CJK@empty\@font@warning}
\DeclareSizeFunction{CJKb}{\CJK@empty\@font@warning}
\DeclareSizeFunction{sCJK}{\CJK@empty\@font@info}
\DeclareSizeFunction{sCJKb}{\CJK@empty\@font@info}

\def\CJK@empty#1{
  \@tempdimb \f@size\p@
  \ifx\optional@arg \@empty
  \else
    \expandafter\ifx
     \csname CJK@\mandatory@arg/\f@size/\the\@tempdimb\endcsname \relax
      \@tempdimb \optional@arg\@tempdimb
      #1{Font\space shape\space `\curr@fontshape'\space
         will\space be\MessageBreak
         scaled\space to\space size\space \the\@tempdimb}
      \expandafter
       \gdef\csname CJK@\mandatory@arg/\f@size/\the\@tempdimb\endcsname{}
    \fi
  \fi
  \edef\external@font{
    \mandatory@arg\CJK@plane\space at \the\@tempdimb}
  \xdef\font@name{
    \csname \curr@fontshape/\f@size/\CJK@plane\endcsname}
  \expandafter\global\expandafter\let
   \csname \CJK@curr@fontshape\expandafter\endcsname
    \csname \curr@fontshape\endcsname}

\DeclareSizeFunction{CJKfixed}{\CJK@fixed\@font@warning}
\DeclareSizeFunction{CJKfixedb}{\CJK@fixed\@font@warning}
\DeclareSizeFunction{sCJKfixed}{\CJK@fixed\@font@info}
\DeclareSizeFunction{sCJKfixedb}{\CJK@fixed\@font@info}

\def\CJK@fixed#1{
  \ifx\optional@arg \@empty
    \edef\external@font{
      \mandatory@arg\CJK@plane}
  \else
    \edef\external@font{
      \mandatory@arg\CJK@plane\space at \optional@arg pt}
  \fi
  \xdef\font@name{
    \csname \curr@fontshape/\f@size/\CJK@plane\endcsname}
  #1{External\space font\space `\external@font'\space loaded\space
     for\space size\MessageBreak
     <\f@size>}
  \expandafter\global\expandafter\let
   \csname \CJK@curr@fontshape\expandafter\endcsname
    \csname \curr@fontshape\endcsname}

\DeclareSizeFunction{CJKsub}{\CJK@sub\@font@warning}
\DeclareSizeFunction{CJKssub}{\CJK@sub\@font@info}

\def\CJK@sub#1{
  \edef\mandatory@arg{\f@encoding/\mandatory@arg}
  \begingroup
    \expandafter\split@name\mandatory@arg/\@nil
    \try@load@fontshape
  \endgroup
  \let\f@user@size\f@size
  \expandafter\ifx\csname\mandatory@arg\endcsname \relax
    \errmessage{No\space declaration\space for\space shape\space
                \mandatory@arg}
    \error@fontshape
  \else
    \expandafter\ifx\csname CJK@\mandatory@arg/\f@size\endcsname \relax
      #1{Font\space shape\space `\curr@fontshape'\MessageBreak
         in\space size\space <\f@size>\space not\space available.\MessageBreak
         Font\space shape\space `\mandatory@arg'\MessageBreak
         tried\space instead}
      \expandafter\gdef\csname CJK@\mandatory@arg/\f@size\endcsname{}
    \fi
    \expandafter\split@name\mandatory@arg/\@nil
  \fi
  \edef\f@size{\f@user@size}
  \get@external@font
  \do@subst@correction
  \expandafter\global\expandafter\let
   \csname \CJK@curr@fontshape\expandafter\endcsname
    \csname \curr@fontshape\endcsname}

% the following size functions are needed for the DNP fonts in JIS encoding.
%     `DNPgen' is similar to `gen' but ignores the optional argument.
%     `DNP' is similar to `gen' but the optional argument is used to 
%     indicate the designsize.
%
% see the comment above for an explanation of DNPb and DNPgenb.

\DeclareSizeFunction{DNPgen}{\CJK@DNPgen}
\DeclareSizeFunction{DNPgenb}{\CJK@DNPgen}

\def\CJK@DNPgen{
  \edef\external@font{
    \mandatory@arg\CJK@plane\f@size}
  \xdef\font@name{
    \csname \curr@fontshape/\f@size/\CJK@plane\endcsname}
  \expandafter\global\expandafter\let
   \csname \CJK@curr@fontshape\expandafter\endcsname
    \csname \curr@fontshape\endcsname}

\DeclareSizeFunction{DNP}{\CJK@DNP}
\DeclareSizeFunction{DNPb}{\CJK@DNP}

\def\CJK@DNP{
  \@tempdimb \f@size\p@
  \edef\external@font{
    \mandatory@arg\CJK@plane\optional@arg\space at \the\@tempdimb}
  \xdef\font@name{
    \csname \curr@fontshape/\f@size/\CJK@plane\endcsname}
  \expandafter\global\expandafter\let
   \csname \CJK@curr@fontshape\expandafter\endcsname
    \csname \curr@fontshape\endcsname}


% we also must redefine \pickup@font to append \CJK@plane to the font name
%     if the particular subfont is already known.

\def\pickup@font{
  \CJK@ifundefined\CJK@plane
    {\expandafter\ifx\font@name \relax%         % old definition
       \define@newfont
     \fi}
    {\expandafter%                              % CJK extension
      \ifx\csname \curr@fontshape/\f@size/\CJK@plane\endcsname \relax
       \define@newfont
     \else
       \xdef\font@name{
         \csname \curr@fontshape/\f@size/\CJK@plane\endcsname}
     \fi}}

% for older versions of LaTeX2e command we must redefine \selectfont.
%     It will now reset \ifCJK@bold@ and calls \CJK@curr@fontshape
%     additionally (if it exists) to execute the loading-setting
%     parameter of \DeclareFontShape each time we switch to this font.
%     \CJK@curr@fontshape has been defined by the above size functions.
%     For newer versions of LaTeX2e it is sufficient to set a hook for
%     \selectfont.
%
% for compatibility with older versions of LaTeX2e we provide a
%     definition of \IfFormatAtLeastTF.

\def\IfFormatAtLeastTF{\@ifl@t@r\fmtversion}

\IfFormatAtLeastTF{2020-10-01}
  {\AddToHook{selectfont}{
     \expandafter
      \ifx\csname CJK@\curr@fontshape\endcsname \relax
     \else
       \CJK@bold@false
       \csname CJK@\curr@fontshape\endcsname
     \fi}}
  {\DeclareRobustCommand{\selectfont}{
     \ifx\f@linespread \baselinestretch
     \else
       \set@fontsize\baselinestretch\f@size\f@baselineskip
     \fi
     \xdef\font@name{\csname\curr@fontshape/\f@size\endcsname}
     \pickup@font
     \font@name
     \expandafter%                                 % CJK extension
      \ifx\csname CJK@\curr@fontshape\endcsname \relax
     \else
       \CJK@bold@false
       \csname CJK@\curr@fontshape\endcsname
     \fi
     \size@update
     \enc@update}}


% additional vertical and horizontal information for a font is stored in
%     files with the extension `.fdx'. We extend LaTeX's
%     \try@load@fontshape@ macro to load them.
%
% the macros \CJKhdef, \CJKvdef, \CJKhlet and \CJKvlet should be used to
%     handle commands in `.fdx' files.

\def\CJK@load@fdx{
  \expandafter\ifx\csname \f@encoding+\f@family+x\endcsname \relax
    \global\expandafter\let\csname \f@encoding+\f@family+x\endcsname \@empty
    \def\CJKhdef##1##2{
      \expandafter\gdef\csname \CJK@enc/\CJK@family/##1/h\endcsname{##2}}
    \def\CJKhlet##1##2{
      \edef\reserved@a{\CJK@enc/\CJK@family/##1/h}
      \edef\reserved@b{\CJK@enc/\CJK@family/##2/h}
      \global\expandafter\let
       \csname\reserved@a\expandafter\endcsname \csname\reserved@b\endcsname}
    \def\CJKvdef##1##2{
      \expandafter\gdef\csname \CJK@enc/\CJK@family/##1/v\endcsname{##2}}
    \def\CJKvlet##1##2{
      \edef\reserved@a{\CJK@enc/\CJK@family/##1/v}
      \edef\reserved@b{\CJK@enc/\CJK@family/##2/v}
      \global\expandafter\let
       \csname\reserved@a\expandafter\endcsname \csname\reserved@b\endcsname}
    \edef\reserved@a{
      \lowercase{\noexpand\InputIfFileExists{\f@encoding\f@family.fdx}}}
    \reserved@a{}{}
  \fi}

\expandafter\def\expandafter\try@load@fontshape\expandafter{
  \try@load@fontshape
  \CJK@load@fdx}


% \CJKglue defines the stretchability of CJK characters.

\newcommand{\CJKglue}{\hskip \z@ \@plus .08\baselineskip}

\def\CJK@nobreakglue{
  \nobreak
  \CJKglue
  \nobreak}

% if the `verbatim' package is loaded it is possible to improve the output
%     automatically, namely, to avoid breaking of overfull lines in a
%     verbatim environment. The following command will install a hook to
%     suppress insertion of glue between CJK glyphs. MULEenc.sty will extend
%     it for Thai glyphs.

\def\CJK@verbatim{
  \addto@hook{\every@verbatim}{
    \renewcommand{\CJKglue}{}}}
\CJK@ifundefined\mule@verbatim
  {\mule@verbatim{}}
  {}

\def\CJKverbatim{
  \mule@verbatim
  \CJK@verbatim}


% increasing \CJKtolerance will allow more space between Hangul words.

\newcommand{\CJKtolerance}{400}


% \CJKtilde changes the definition of the active `~' character to embed
%     non-CJK words into CJK text. The horizontal space defined here has
%     a smaller width than an ordinary space character and is breakable.
%     It will suppress spaces afterwards.
%     The original definition will be preserved within \nbs, which is
%     a shorthand for the LaTeX command \nobreakspace.
%
% \standardtilde is the opposite command.

\let\nbs \nobreakspace

\DeclareRobustCommand{\CJKtilde}{
  \CJK@global\def~{\hspace{0.25em plus 0.125em minus 0.08em}\ignorespaces}}
\DeclareRobustCommand{\standardtilde}{
  \CJK@global\def~{\nobreakspace{}}}


% \CJKspace and \CJKnospace enables the user to switch between a CJK and a
%     CJK* environment without leaving the actual environment:
%
%     \CJKnospace switches from CJK to CJK*
%     \CJKspace switches from CJK* to CJK
%
% the definitions are in MULEenc.sty also.

\DeclareRobustCommand{\CJKspace}{
  \CJK@global\let\CJK@ignorespaces \@empty}
\DeclareRobustCommand{\CJKnospace}{
  \CJK@global\let\CJK@ignorespaces \ignorespaces}


% \CJKindent sets \parindent to two ideographic spaces. \CJK@spaceChar
%     is defined in CJK.enc for all encodings.

\newbox\CJK@indent

\providecommand{\CJKindent}{
  \setbox\CJK@indent\hbox{\CJK@spaceChar\CJK@spaceChar}
  \parindent\wd\CJK@indent
}


% make all characters possibly used active so they can become macros.

\def\CJK@makeActive{
  \@tempcnta "080\relax
  \loop
    \CJK@active\catcode\@tempcnta \active
    \ifnum\@tempcnta < "0FE\relax
      \advance\@tempcnta \@ne
  \repeat}

\def\CJK@makeInactive{
  \@tempcnta "080\relax
  \loop
    \CJK@active\catcode\@tempcnta 12\relax
    \ifnum\@tempcnta < "0FE\relax
      \advance\@tempcnta \@ne
  \repeat}


% the following macro is a signature for `CJKspace.sty'.

\def\CJK@@@{}


% we assign to each active character ^^xx the macro \CJK@XX (if expansion
%     occurs); this will be done in the .bdg files. Then the various .enc
%     files define \CJK@.. (using \CJK@namegdef) with encoding-specific
%     macros.

\def\CJK@namedef#1{
  \CJK@active\def#1{
    \CJK@@@
    \ifx\protect \@typeset@protect
      \string #1
    \else
      \noexpand #1
    \fi}}

\def\CJK@namepdef#1{
  \CJK@active\def#1{
    \CJK@@@
    \ifx\protect \@typeset@protect
      \expandafter\expandafter\expandafter\CJK@X
       \expandafter\string\expandafter#1
    \else
      \noexpand #1
    \fi}}

\def\CJK@nameppdef#1{
  \CJK@active\def#1{
    \CJK@@@
    \ifx\protect \@typeset@protect
      \expandafter\expandafter\expandafter\CJK@XX
       \expandafter\string\expandafter#1
    \else
      \noexpand #1
    \fi}}

\def\CJK@namepppdef#1{
  \CJK@active\def#1{
    \CJK@@@
    \ifx\protect \@typeset@protect
      \expandafter\expandafter\expandafter\CJK@XXX
       \expandafter\string\expandafter#1
    \else
      \noexpand #1
    \fi}}

\def\CJK@nameppppdef#1{
  \CJK@active\def#1{
    \CJK@@@
    \ifx\protect \@typeset@protect
      \expandafter\expandafter\expandafter\CJK@XXXX
       \expandafter\string\expandafter#1
    \else
      \noexpand #1
    \fi}}


\def\CJK@X#1{
  \csname CJK@\number `#1\endcsname\CJK@ignorespaces}

% two possibilities:
%     either \CJK@XX <arg1> <arg2>
%     or     \CJK@XX <arg1> \protect <arg2>
\def\CJK@XX#1#2{
  \ifx #2\protect
    \expandafter\CJK@XXp\expandafter#1
  \else
    \csname CJK@\number `#1\endcsname{`#2}\CJK@ignorespaces
  \fi}
\def\CJK@XXp#1#2{
  \csname CJK@\number `#1\endcsname{`#2}\CJK@ignorespaces}

% two possibilities:
%     either \CJK@XXX <arg1> <arg2> <arg3>
%     or     \CJK@XXX <arg1> \protect <arg2> \protect <arg3>
\def\CJK@XXX#1#2#3{
  \ifx #2\protect
    \expandafter\CJK@XXXp\expandafter#1#3
  \else
    \csname CJK@\number `#1\endcsname{`#2}{`#3}\CJK@ignorespaces
  \fi}
\def\CJK@XXXp#1#2#3#4{
  \csname CJK@\number `#1\endcsname{`#2}{`#4}\CJK@ignorespaces}

% two possibilities:
%     either \CJK@XXXX <arg1> <arg2> <arg3> <arg4>
%     or     \CJK@XXXX <arg1> \protect <arg2> \protect <arg3> \protect <arg4>
\def\CJK@XXXX#1#2#3#4{
  \ifx #2\protect
    \expandafter\CJK@XXXXp\expandafter#1#3
  \else
    \csname CJK@\number `#1\endcsname{`#2}{`#3}{`#4}\CJK@ignorespaces
  \fi}
\def\CJK@XXXXp#1#2#3#4#5{
  \csname CJK@\number `#1\endcsname{`#2}{`#3}{`#5}\CJK@ignorespaces}


% these auxiliary macros reset \lccode's and \uccode's of characters
%     0x80-0xFF. This overrides the values set by LaTeX2e.

\def\CJK@upperReset{
  \@tempcnta "080\relax
  \loop
    \CJK@local\uccode\@tempcnta \z@
    \ifnum\@tempcnta < "0FF\relax
      \advance\@tempcnta \@ne
  \repeat}

\def\CJK@lowerReset{
  \@tempcnta "080\relax
  \loop
    \CJK@local\lccode\@tempcnta \z@
    \ifnum\@tempcnta < "0FF\relax
      \advance\@tempcnta \@ne
  \repeat}


% finally come the CJK environments:
%
% CJK* will swallow spaces after a CJK character, whereas CJK will not.
%
% the first parameter selects the CJK encoding, the second the CJK font
%     family; the optional argument selects the fontencoding.
%
% each time a CJK or CJK* environment will be opened the hook \CJKhook will
%     be called (this feature is used by cjk-enc.el).
%
% always end the line after saying \begin{CJK} or \begin{CJK*};
%     any characters on the same line will have already been read with
%     their non-CJK meanings.

\def\CJK@envStart#1#2#3{
  \CJK@upperReset
  \ifCJK@lowercase@
    \CJK@lowerReset
  \fi

  \CJK@makeActive

  % we enable \CJK@selectFamily and \CJK@selectEnc.

  \CJK@global\let\CJK@selectFamily \CJK@selFam
  \CJK@global\let\CJK@selectEnc \CJK@selEnc

  \def\CJK@@@enc{#2}
  \ifx\CJK@@@enc \@empty
    \PackageInfo{CJK}{
      no encoding parameter given,\MessageBreak
      waiting for \protect\CJKenc\space commands}
  \else
    \CJKenc{#2}
  \fi
  \CJKfontenc{#2}{#1}
  \CJKfamily{#3}
  \def\CJK@series{\f@series}
  \def\CJK@shape{\f@shape}

  \csname CJKhook\endcsname}

\def\CJK@envEnd{
  \ifx\CJK@global \global
    \CJK@makeInactive
    \CJK@global\let\CJK@selectFamily \relax
    \CJK@global\let\CJK@selectEnc \relax
  \fi}

\newenvironment{CJK}[3][]{
  \CJKspace
  \CJK@envStart{#1}{#2}{#3}
 }{
  \CJK@envEnd}

\newenvironment{CJK*}[3][]{
  \CJKnospace
  \CJK@envStart{#1}{#2}{#3}
 }{
  \CJK@envEnd}


% \CJKcaption{caption} will test whether we are in a CJK environment; if yes,
%     it tries to load `<caption>.cpx' (this is <caption>.cap in preprocessed
%     mode).

\newcommand{\CJKcaption}[1]{
  \ifx\CJK@actualBinding \@empty
    \PackageError{CJK}{
      You must be inside of a CJK environment to use \protect\CJKcaption}{}
  \else
    \makeatletter
    \InputIfFileExists{#1.cpx}{}{
      \PackageError{CJK}{
        Can't find #1.cpx}{
        The default captions are used if you continue.}}
    \makeatother
  \fi}


% the writing direction.

\def\CJK@direction{h}


% reset endline character.

\endlinechar `\^^M


% in case some customization is necessary it should be done in the
%     configuration file `CJK.cfg' and *not* here.

\InputIfFileExists{CJK.cfg}
  {\typeout{^^J
            *****************************************^^J
            * Local configuration file CJK.cfg used *^^J
            *****************************************^^J}}
  {}


\endinput