%
% lltjext-251101.sty: derived from plext.sty in pLaTeX.
% This file is used for LaTeX2e <=2025-11-01.
%

\NeedsTeXFormat{LaTeX2e}
\ProvidesPackage{lltjext-251101}[2026-05-16 v1.2k-ltj-19 Macros for vertical writing]

\RequirePackage{array}
\newcount\ltj@ext@dir

\ExplSyntaxOn

%%% array and tabular
\pretocmd{\array}{\ltj@ext@dir=\ltjgetparameter{direction}\relax}{}{}
\def\@tabarray{\@ifnextchar<\p@tabarray{\p@tabarray<Z>}}
\def\p@tabarray<#1>{\@ifnextchar[%]
   {\p@array<#1>}{\p@array<#1>[c]}}
\def\p@array<#1>[#2]#3{%
  \ifnum\ltj@ext@dir=0~ \ltj@ext@dir=\ltjgetparameter{direction}\relax\fi
  \let\box@dir\relax
  %% determine strutbox
  \if #1z\relax
    \ifnum\ltj@ext@dir=3~
      \let\box@dir\utod\@tempcnta=\zstrutbox
    \fi
  \else
    \if #1y\relax
      \let\box@dir\yoko\@tempcnta=\ystrutbox
    \else\if #1t\relax
      \let\box@dir\tate\@tempcnta=\tstrutbox
    \else\if #1d\relax
       \let\box@dir\dtou\@tempcnta=\dstrutbox
    \else\if #1u\relax
       \let\box@dir\utod\@tempcnta=\zstrutbox
    \fi\fi\fi\fi
  \fi
  \ifx\box@dir\relax
    \ifcase\ltj@ext@dir
       \or   \let\box@dir\dtou\@tempcnta=\dstrutbox% dtou
       \or\or\let\box@dir\tate\@tempcnta=\tstrutbox% tate
       \or   \let\box@dir\yoko\@tempcnta=\ystrutbox% yoko
       \else \let\box@dir\utod\@tempcnta=\zstrutbox% utod
    \fi
  \fi
  %%
  \setbox \@arstrutbox \hbox{\box@dir\vrule
             \@height \arraystretch
               \dimexpr \ltjgetht\@tempcnta+\extrarowheight\relax
             \@depth \arraystretch \ltjgetdp \@tempcnta
             \@width \z@}%
  \fork@array@option<#1>[#2]%
  \tbl_init_cell_data_for_table:
  \begingroup
  \@mkpream{#3}%
  \tbl_count_table_cols:
  \xdef\@preamble{%
    \noexpand\ar@ialign
    \@halignto \bgroup \@arstrut
      \UseTaggingSocket{tbl/row/begin}
      \tbl_init_cell_data_for_row:
      \@preamble
      \tabskip \z@ \cr}%
  \endgroup
  \@arrayleft
  \@begin@alignbox
  \bgroup
  \box@dir\adjustbaseline
  \let\@sharp##\let\protect\relax
  \lineskip \z@
  \baselineskip \z@
  \mathsurround \z@
  \let\\\@arraycr \let\tabularnewline\\
  \def\par{\ifnum\currentgrouptype=6~ \else\@@par\fi}%
  \UseTaggingSocket{tbl/init}
  \@preamble
}
\def\endarray{%
  \tbl_crcr:n {endarray}
  \tag_socket_use_expandable:n {math/luamml/array/save}
  \egroup \UseTaggingSocket{tbl/finalize}
  \tbl_restore_outer_cell_data:
  \egroup \@end@alignbox
  \tag_socket_use:n {math/luamml/array/finalize}
  \@arrayright \gdef \@preamble {}
}

\patchcmd{\@tabular}{\hbox\bgroup}{%
  \hbox\bgroup\ltj@ext@dir=\ltjgetparameter{direction}\relax}{}{\typeout{lltjext patch failed @tabular}}
\@namedef{tabular*}{\@ifnextchar<{\p@stabular}{\p@stabular<Z>}}%>
\def\p@stabular<#1>#2{%
   \setlength\dimen@{#2}%
   \edef\@halignto{to\the\dimen@}\@tabular<#1>}
\def\endtabular{\endarray\m@th$\egroup
   \UseTaggingSocket {tbl/hmode/end}\null}
\expandafter \let \csname endtabular*\endcsname = \endtabular

% ↓中身＼周囲→　yoko  tate  utod  dtou
% yoko          A*    B*    B     B
% tate          B*    A*    D     C
% utod          B     D*    A     C
% dtou          B     C     C     A
% A: 周囲と中身の組方向が一致．そのまま \vtop/\vcenter/\vbox
% B: 周囲と中身が90度ずれ．上端/下端がベースラインに揃うように
% C: 周囲と中身が180度ずれ．\vtop, \vbox 入れ替え
% D: 欧文ベースライン同士を揃えるようにする

\def\fork@array@option@@A#1{%
  \let\@end@alignbox\relax
  \if #1t\relax     \let\@begin@alignbox\vtop
  \else\if #1b\relax\let\@begin@alignbox\vbox
  \else             \let\@begin@alignbox\vcenter
  \fi\fi}
\def\fork@array@option@@B#1{%
  \if #1t\relax
    \def\@begin@alignbox{\vtop\bgroup\kern\z@\vbox}%
    \let\@end@alignbox\egroup
  \else\if #1b\relax
    \def\@begin@alignbox{\vbox\bgroup\vbox}%
    \def\@end@alignbox{\kern\z@\egroup}%
  \else
    \let\@begin@alignbox\vcenter
    \let\@end@alignbox\relax
  \fi\fi}
\def\fork@array@option@@C#1{%
  \let\@end@alignbox\relax
  \if #1t\relax     \let\@begin@alignbox\vbox
  \else\if #1b\relax\let\@begin@alignbox\vtop
  \else             \let\@begin@alignbox\vcenter
  \fi\fi}
\def\fork@array@option<#1>[#2]{%
\ifnum\ltj@ext@dir=4~ % yoko
  \ifx\box@dir\yoko      \fork@array@option@@A{#2}%
  \else                  \fork@array@option@@B{#2}%
  \fi
\else\ifnum\ltj@ext@dir=1~ % dtou
  \ifx\box@dir\yoko      \fork@array@option@@B{#2}%
  \else\ifx\box@dir\dtou \fork@array@option@@A{#2}%
  \else                  \fork@array@option@@C{#2}%
  \fi\fi
\else\ifnum\ltj@ext@dir=3~ % tate
  \ifx\box@dir\yoko      \fork@array@option@@B{#2}%
  \else\ifx\box@dir\tate \fork@array@option@@A{#2}%
  \else\ifx\box@dir\dtou \fork@array@option@@C{#2}%
  \else
    \if #2t\relax
      \def\@begin@alignbox{\lower\dimexpr
         \ltjgetparameter{talbaselineshift}-\ltjgetparameter{yalbaselineshift}\vtop}
      \let\@end@alignbox\relax
    \else\if #2b\relax
      \def\@begin@alignbox{\lower\dimexpr
         \ltjgetparameter{talbaselineshift}-\ltjgetparameter{yalbaselineshift}\vbox}
      \let\@end@alignbox\relax
    \else
      \let\@begin@alignbox\vcenter
      \let\@end@alignbox\relax
    \fi\fi
  \fi\fi\fi
\else % utod
  \ifx\box@dir\yoko      \fork@array@option@@B{#2}%
  \else\ifx\box@dir\utod \fork@array@option@@A{#2}%
  \else\ifx\box@dir\dtou \fork@array@option@@C{#2}%
  \else
    \if #2t\relax
      \def\@begin@alignbox{\lower\dimexpr
         \ltjgetparameter{yalbaselineshift}-\ltjgetparameter{talbaselineshift}\vtop}
      \let\@end@alignbox\relax
    \else\if #2b\relax
      \def\@begin@alignbox{\lower\dimexpr
         \ltjgetparameter{yalbaselineshift}-\ltjgetparameter{talbaselineshift}\vbox}
      \let\@end@alignbox\relax
    \else
      \let\@begin@alignbox\vcenter
      \let\@end@alignbox\relax
    \fi\fi
  \fi\fi\fi
\fi\fi\fi}

%%% caption
\newbox\@floatbox
\newdimen\floatwidth
\newdimen\floatheight
\newdimen\floatruletick \floatruletick=0.4pt
\newdimen\captionfloatsep \captionfloatsep=10pt
\def\caption@dir{Z}
\let\captiondir\relax
\newdimen\captionwidth \captionwidth\z@
\def\caption@posa{Z}
\def\caption@posb{Z}
\newbox\@captionbox
\def\captionfontsetup{\normalfont\normalsize}
\def\layoutfloat{\@ifnextchar(%)
   {\X@layoutfloat}{\X@layoutfloat(-5\p@,-5\p@)}}
\def\X@layoutfloat(#1,#2){\@ifnextchar[%]
   {\@layoutfloat(#1,#2)}{\@layoutfloat(#1,#2)[c]}}
\long\def\@layoutfloat(#1,#2)[#3]#4{%
  \setbox\z@\hbox{#4}%
  \floatwidth=#1 \floatheight=#2 \edef\float@pos{#3}%
  \ifdim\floatwidth<\z@
     \floatwidth\ltjgetwd\z@\floatruletick\z@
  \fi
  \ifdim\floatheight<\z@
     \floatheight\ltjgetht\z@\advance\floatheight\ltjgetdp\z@\relax
     \floatruletick\z@
  \fi
  \setbox\@floatbox\vbox to\floatheight{\offinterlineskip
    \hrule width\floatwidth height\floatruletick depth\z@
    \vss\hbox to\floatwidth{%
      \vrule width\floatruletick height\floatheight depth\z@
      \hss\vbox to\floatheight{\hsize\floatwidth\vss#4\vss}\hss
      \vrule width\floatruletick height\floatheight depth\z@
    }\hrule width\floatwidth height\floatruletick depth\z@}}
\def\DeclareLayoutCaption#1<#2>(#3)[#4#5]{%
  \expandafter
  \ifx\csname #1@layoutc@ption\endcsname\relax \else
    \@latex@info{Redeclaring capiton layout setting of '#1'}%
  \fi
  \expandafter
  \gdef\csname #1@layoutc@ption\endcsname{%
     \if Z\caption@dir\def\caption@dir{#2}\fi
     \ifdim\captionwidth=\z@ \captionwidth=#3\relax\fi
     \if Z\caption@posa\def\caption@posa{#4}\fi
     \if Z\caption@posb\def\caption@posb{#5}\fi}}
\@onlypreamble\DeclareLayoutCaption
\DeclareLayoutCaption{figure}<n>(.8\linewidth)[cd]
\DeclareLayoutCaption{table}<n>(.8\linewidth)[cu]
\def\layoutcaption{\def\caption@dir{Z}\captionwidth\z@
  \def\caption@posa{Z}\def\caption@posb{Z}%
  \@ifnextchar<\X@layoutcaption{%
    \@ifnextchar(\@ilayoutcaption{%
      \@ifnextchar[\@iilayoutcaption\relax}}}
\def\X@layoutcaption<#1>{\def\caption@dir{#1}%
  \@ifnextchar(\@ilayoutcaption{%
    \@ifnextchar[\@iilayoutcaption\relax}}
\def\@ilayoutcaption(#1){\setlength\captionwidth{#1}%
  \@ifnextchar[{\@iilayoutcaption}{\relax}}
\def\@iilayoutcaption[#1#2]{%
  \def\caption@posa{#1}\def\caption@posb{#2}}
\def\pcaption{%
  \ifx\@captype\@undefined
    \@latex@error{\noexpand\pcaption outside float}\@ehd
    \expandafter\@gobble
  \else
    \refstepcounter\@captype
    \expandafter\@firstofone
  \fi
  {\@dblarg{\@pcaption\@captype}}%
}
\long\def\@pcaption#1[#2]#3{%
  \addcontentsline{\csname ext@#1\endcsname}{#1}{%
    \protect\numberline{\csname the#1\endcsname}{\ignorespaces#2}}%
  \ifvoid\@floatbox
     \@latex@error{Use \noexpand\pcaption with `\protect\layoutfloat'}\@eha
  \fi
  \make@pcaptionbox{#3}%
  \@pboxswfalse
  \setbox\@tempboxa\vbox{\hbox to\hsize{\if l\float@pos\else\hss\fi
    \if l\caption@posb\box\@captionbox\kern\captionfloatsep\fi
    \if t\caption@posa\vtop
    \else\if b\caption@posa\vbox
    \else\@pboxswtrue $\vcenter \fi\fi
    {\if u\caption@posb\box\@captionbox\kern\captionfloatsep\fi
     \unvbox\@floatbox
     \if d\caption@posb\kern\captionfloatsep\box\@captionbox\fi}%
    \if@pboxsw \m@th$\fi
    \if r\caption@posb\kern\captionfloatsep\box\@captionbox\fi
    \if r\float@pos\else\hss\fi}}%
  \par\vskip.25\baselineskip
  \box\@tempboxa}
\def\make@pcaptionbox#1{%
  \expandafter
  \ifx\csname\@captype @layoutc@ption\endcsname\relax
     \@latex@warning{Default caption layout of `\@captype' unknown.}%
       \def\caption@dir{Z}\captionwidth\z@
       \def\caption@posa{Z}\def\caption@posb{Z}%
  \else
     \csname \@captype @layoutc@ption\endcsname
  \fi
  \@tempswafalse
  % \@tempswa: 基本組の組方向とキャプションの組方向が直交するか？
  \if y\caption@dir \let\captiondir\yoko
    \ifodd\ltjgetparameter{direction}\relax\@tempswatrue\fi
  \else\if z\caption@dir \let\captiondir\relax
    \ifnum\ltjgetparameter{direction}=3~ \let\captiondir\utod\fi
  \else\if d\caption@dir \let\captiondir\dtou
    \ifodd\ltjgetparameter{direction}\else\@tempswatrue\fi
  \else\if u\caption@dir \let\captiondir\utod
    \ifodd\ltjgetparameter{direction}\else\@tempswatrue\fi
  \else\if t\caption@dir \let\captiondir\tate
    \ifodd\ltjgetparameter{direction}\else\@tempswatrue\fi
  \fi\fi\fi\fi\fi
  \setbox0\hbox{\hbox{\captiondir
     \captionfontsetup\parindent\z@\inhibitglue
     \csname fnum@\@captype\endcsname 　#1}}%"
  \if@tempswa\@tempdima\ltjgetht0 \advance\@tempdima\ltjgetdp0
  \else\@tempdima\ltjgetwd0 \fi
  \ifdim\@tempdima>\captionwidth \@tempdima\captionwidth \fi
  \@pboxswfalse
  \setbox0\hbox{%
    \if u\caption@posb\vbox
    \else\if d\caption@posb\vbox
    \else\if t\caption@posa\vtop
    \else\if b\caption@posa\vbox
    \else\ifmmode\vcenter\else\@pboxswtrue $\vcenter\fi
    \fi\fi\fi\fi
    {\hsize\@tempdima\kern\z@
    \vbox{\captiondir\hsize\@tempdima
      \captionfontsetup\parindent\z@\inhibitglue
      \csname fnum@\@captype\endcsname 　#1}\kern\z@
    }\if@pboxsw \m@th$\fi}%
  \let\to@captionboxwidth\relax
  \if l\caption@posb \else\if r\caption@posb\else
  \def\to@captionboxwidth{to\floatwidth}\fi\fi
  \setbox\@captionbox\hbox\to@captionboxwidth{%
     \if t\caption@posa\else\hss\fi
     \unhbox0\relax
     \if b\caption@posa\else\hss\fi}}

%%% minipage and parbox
\def\minipage{\@ifnextchar<%>
   {\X@minipage}{\X@minipage<Z>}}
\def\X@minipage<#1>{\@ifnextchar[%]
   {\@iminipage<#1>}{\@iiiminipage<#1>{c}\relax[s]}}
\def\@iminipage<#1>[#2]{\@ifnextchar[%]
   {\@iiminipage<#1>{#2}}{\@iiiminipage<#1>{#2}\relax[s]}}
\def\@iiminipage<#1>#2[#3]{\@ifnextchar[%]
   {\@iiiminipage<#1>{#2}{#3}}{\@iiiminipage<#1>{#2}{#3}[#2]}}
\def\@iiiminipage<#1>#2#3[#4]#5{%
  \ifcsname @kernel@init@minipage\endcsname\lastnamedcs\fi
  \leavevmode\@pboxswfalse\bgroup%<=== lltj
  \setlength\@tempdima{#5}%
  \def\@mpargs{<#1>{#2}{#3}[#4]{#5}}%
  \let\box@dir\relax
  \if #1z\relax
    \ifnum\ltjgetparameter{direction}=3~
      \let\box@dir\utod
    \fi
  \else
    \if #1y\relax     \let\box@dir\yoko
    \else\if #1t\relax\let\box@dir\tate
    \else\if #1d\relax\let\box@dir\dtou
    \else\if #1u\relax\let\box@dir\utod
    \fi\fi\fi\fi
  \fi
  \ifx\box@dir\relax
    \ifcase\ltjgetparameter{direction}\relax
       \or   \let\box@dir\dtou
       \or\or\let\box@dir\tate
       \or   \let\box@dir\yoko
       \else \let\box@dir\utod
    \fi
  \fi
  \setbox\@tempboxa\vbox\bgroup\box@dir
    \adjustbaseline
    \color@begingroup
      \hsize\@tempdima
      \textwidth\hsize \columnwidth\hsize
      \@parboxrestore
      \def\@mpfn{mpfootnote}\def\thempfn{\thempfootnote}%
      \c@mpfootnote\z@
      \let\@footnotetext\@mpfootnotetext
      \let\@listdepth\@mplistdepth \@mplistdepth\z@
      \@minipagerestore
      \@setminipage}
\def\endminipage{%
    \par
    \unskip
    \ifvoid\@mpfootins\else
      \vskip\skip\@mpfootins
      \normalcolor
      \footnoterule
      \unvbox\@mpfootins
    \fi
    \@minipagefalse   %% added 24 May 89
  \color@endgroup
  \egroup
  \expandafter\@iiiparbox\@mpargs{\unvbox\@tempboxa}%
  \egroup%<=== lltj
  }
\DeclareRobustCommand\parbox{\@ifnextchar<%>
   {\X@parbox}{\X@parbox<Z>}}
\def\X@parbox<#1>{\@ifnextchar[%]
   {\@iparbox<#1>}{\@iiiparbox<#1>{c}\relax[s]}}
\def\@iparbox<#1>[#2]{\@ifnextchar[%]
   {\@iiparbox<#1>{#2}}{\@iiiparbox<#1>{#2}\relax[s]}}
\def\@iiparbox<#1>#2[#3]{\@ifnextchar[%]%
   {\@iiiparbox<#1>{#2}{#3}}{\@iiiparbox<#1>{#2}{#3}[#2]}}
\long\def\@iiiparbox<#1>#2#3[#4]#5#6{%
  \leavevmode\@pboxswfalse
  \setlength\@tempdima{#5}%
  \fork@parbox@option<#1>[#2]%
  \@begin@tempboxa\vbox{\box@dir
    \hsize\@tempdima\@parboxrestore\adjustbaseline
       #6\@@par}%
    \ifx\relax#3\else
      \setlength\@tempdimb{#3}%
      \edef\@parboxto{to\the\@tempdimb}%
    \fi
    \@begin@parbox\@parboxto{\box@dir\adjustbaseline
       \let\hss\vss\let\unhbox\unvbox
       \csname bm@#4\endcsname}%
       \if@pboxsw\m@th$\null\else\@end@parbox\fi
  \@end@tempboxa
  }

% ↓中身＼周囲→　yoko  tate  utod  dtou
% yoko          A*    B*    B     B
% tate          B*    A*    D     C
% utod          B     D*    A     C
% dtou          B     C     C     A
% A: 周囲と中身の組方向が一致．そのまま \vtop/\vcenter/\vbox
% B: 周囲と中身が90度ずれ．上端が和文の高さ or 下端が和文の深さに揃うように
% C: 周囲と中身が180度ずれ．（コードは B のものを流用）
% D: 上端が和文の高さ or 下端が和文の深さに揃うように（コードは B のものを流用）
% 従来では \@end@parbox --> \m@th$\null としていたケースは，
% （\__math_grab_dollar_delim:w 使用によりうまく動かなくなったので）\@pboxswtrue に変更

\def\fork@parbox@option@@A#1{%
  \let\@end@parbox\relax
  \if #1t\relax     \let\@begin@parbox\vtop
  \else\if #1b\relax\let\@begin@parbox\vbox
  \else
    \ifmmode
      \let\@begin@parbox\vcenter
    \else
      \def\@begin@parbox{\null$\vcenter}%
      \@pboxswtrue
    \fi
  \fi\fi}
\def\lltjext@getjablshift{%
  \ifnum\ltj@ext@dir=3~ \ltjgetparameter{tjabaselineshift}\else
  \ltjgetparameter{yjabaselineshift}\fi}
\def\fork@parbox@option@@B#1{%
  \if #1t\relax
    \def\@begin@parbox{\raise\dimexpr\cht-\lltjext@getjablshift\vtop\bgroup\kern\z@\vbox}%
    \let\@end@parbox\egroup
  \else\if #1b\relax
    \def\@begin@parbox{\lower\dimexpr\cdp+\lltjext@getjablshift\vbox\bgroup\vbox}%
    \def\@end@parbox{\kern\z@\egroup}%
  \else
    \ifmmode
      \let\@begin@parbox\vcenter\let\@end@parbox\relax
    \else
      \def\@begin@parbox{\null$\vcenter}%
      \@pboxswtrue
    \fi
  \fi\fi}
\let\fork@parbox@option@@C=\fork@parbox@option@@B
\def\fork@parbox@option<#1>[#2]{%
  \let\box@dir\relax \ltj@ext@dir=\ltjgetparameter{direction}\relax
  \if #1z\relax
    \ifnum\ltj@ext@dir=3~
      \let\box@dir\utod
    \fi
  \else
    \if #1y\relax     \let\box@dir\yoko
    \else\if #1t\relax\let\box@dir\tate
    \else\if #1d\relax\let\box@dir\dtou
    \else\if #1u\relax\let\box@dir\utod
    \fi\fi\fi\fi
  \fi
  \ifx\box@dir\relax
    \ifcase\ltj@ext@dir
       \or   \let\box@dir\dtou
       \or\or\let\box@dir\tate
       \or   \let\box@dir\yoko
       \else \let\box@dir\utod
    \fi
  \fi
\ifnum\ltj@ext@dir=4~ % yoko
  \ifx\box@dir\yoko      \fork@parbox@option@@A{#2}%
  \else                  \fork@parbox@option@@B{#2}%
  \fi
\else\ifnum\ltj@ext@dir=1~ % dtou
  \ifx\box@dir\yoko      \fork@parbox@option@@B{#2}%
  \else\ifx\box@dir\dtou \fork@parbox@option@@A{#2}%
  \else                  \fork@parbox@option@@C{#2}%
  \fi\fi
\else\ifnum\ltj@ext@dir=3~ % tate
  \ifx\box@dir\yoko      \fork@parbox@option@@B{#2}%
  \else\ifx\box@dir\tate \fork@parbox@option@@A{#2}%
  \else\ifx\box@dir\dtou \fork@parbox@option@@C{#2}%
  \else                  \fork@parbox@option@@B{#2}% D
  \fi\fi\fi
\else % utod
  \ifx\box@dir\yoko      \fork@parbox@option@@B{#2}%
  \else\ifx\box@dir\utod \fork@parbox@option@@A{#2}%
  \else\ifx\box@dir\dtou \fork@parbox@option@@C{#2}%
  \else                  \fork@parbox@option@@B{#2}% D
  \fi\fi\fi
\fi\fi\fi}

%%% pbox
\def\@startpbox#1{\bgroup
  \color@begingroup
  \box@dir\adjustbaseline%%% これを追加
  \setlength\hsize{#1}\@arrayparboxrestore
    \everypar{%
       \vrule \@height \ltjgetht\@arstrutbox \@width \z@
       \everypar{}}%
    }%
\DeclareRobustCommand\pbox{\leavevmode\@ifnextchar<{\X@makePbox}{\X@makePbox<Z>}}
\def\X@makePbox<#1>{%
  \@ifnextchar[{\@imakePbox<#1>}{\@imakePbox<#1>[-5\p@]}}
\def\@imakePbox<#1>[#2]{\@ifnextchar[%]
  {\@iimakePbox<#1>{#2}}{\@iimakePbox<#1>{#2}[c]}}
\def\@iimakePbox<#1>#2[#3]#4{%
  \bgroup\let\box@dir\relax
  \if #1z\relax
    \ifnum\ltjgetparameter{direction}=3~
      \let\box@dir\utod
    \fi
  \else
    \if #1y\relax     \let\box@dir\yoko
    \else\if #1t\relax\let\box@dir\tate
    \else\if #1d\relax\let\box@dir\dtou
    \else\if #1u\relax\let\box@dir\utod
    \fi\fi\fi\fi
  \fi
  \ifx\box@dir\relax
    \ifcase\ltjgetparameter{direction}
       \or   \let\box@dir\dtou
       \or\or\let\box@dir\tate
       \or   \let\box@dir\yoko
       \else \let\box@dir\utod
    \fi
  \fi
    \setlength{\@tempdima}{#2}%
    \ifdim\@tempdima<\z@ \hbox{\box@dir#4}\else
    \hb@xt@\@tempdima{\box@dir
               \if #3l\relax\else\hss\fi
               #4\relax
               \if #3r\relax\else\hss\fi}\fi\egroup}

%%% picture
\RenewDocumentCommand\picture{O{} D<>{Z} m}{%
  \leavevmode
  \X@pictur@<#2>#3}
\def\X@pictur@<#1>(#2,#3){\@ifnextchar(%)
   {\@@picture<#1>(#2,#3)}{\@@picture<#1>(#2,#3)(0,0)}}
\newdimen\@picwd
\def\ltj@@pic@reset@blshift{%
  \ltj@yablshift\z@\ltj@ykblshift\z@
  \ltj@tablshift\z@\ltj@tkblshift\z@
}%
\def\@@picture<#1>(#2,#3)(#4,#5){%
  \edef\ltj@@pic@save@blshift{%
    \noexpand\ltj@yablshift\the\ltj@yablshift\noexpand\relax
    \noexpand\ltj@ykblshift\the\ltj@ykblshift\noexpand\relax
    \noexpand\ltj@tablshift\the\ltj@tablshift\noexpand\relax
    \noexpand\ltj@tkblshift\the\ltj@tkblshift\noexpand\relax
  }%
  \bgroup\let\box@dir\relax
  \if #1z\relax
    \ifnum\ltjgetparameter{direction}=3~
      \let\box@dir\utod
    \fi
  \else
    \if #1y\relax     \let\box@dir\yoko
    \else\if #1t\relax\let\box@dir\tate
    \else\if #1d\relax\let\box@dir\dtou
    \else\if #1u\relax\let\box@dir\utod
    \fi\fi\fi\fi
  \fi
  \ifx\box@dir\relax
    \ifcase\ltjgetparameter{direction}
       \or   \let\box@dir\dtou
       \or\or\let\box@dir\tate
       \or   \let\box@dir\yoko
       \else \let\box@dir\utod
    \fi
  \fi
  \@defaultunitsset\@picht{#3}\unitlength
  \@defaultunitsset\@picwd{#2}\unitlength
  \setbox\@picbox\hbox to\@picwd\bgroup\box@dir
    \@defaultunitsset\@tempdimc{#4}\unitlength\hskip-\@tempdimc
    \@defaultunitsset\@tempdimc{#5}\unitlength\lower\@tempdimc\hbox\bgroup
  \ltj@@pic@reset@blshift
  \ignorespaces}
\def\endpicture{%
  \egroup\hss\egroup
  \setbox0=\hbox{\box@dir%
    \ltjsetht\@picbox\@picht \ltjsetdp\@picbox\z@
  }%
  \@tempswafalse
  \ifnum\ltjgetparameter{direction}=3~  \@tempswatrue\fi
  \ifnum\ltjgetparameter{direction}=11~ \@tempswatrue\fi
  \if@tempswa
    \ifx\box@dir\yoko % この場合だけ垂直位置補正が必要
     \ltjsetht\@picbox\dimexpr\ltjgetht\@picbox+\ltjgetdp\@picbox\relax
      \ltjsetdp\@picbox\z@
    \fi
  \fi
  \mbox{\box\@picbox}%
  \egroup\ltj@@pic@save@blshift}
\let\org@put\put
\def\put{\ltj@@pic@reset@blshift\org@put}
\let\org@line\line
\def\line{\ltj@@pic@reset@blshift\org@line}
\let\org@vector\vector
\def\vector{\ltj@@pic@reset@blshift\org@vector}
\let\org@dashbox\dashbox
\def\dashbox{\ltj@@pic@reset@blshift\org@dashbox}
\let\org@oval\oval
\def\oval{\ltj@@pic@reset@blshift\org@oval}
\let\org@circle\circle
\def\circle{\ltj@@pic@reset@blshift\org@circle}

%%% rensuji
\newif\ifnot@advanceline
\newskip\rensujiskip
\rensujiskip=0.25\chs plus.25\zw minus.25\zw
\DeclareRobustCommand\rensuji{%
  \@ifstar{\not@advancelinetrue\@rensuji}{\@rensuji}}
\def\@rensuji{\@ifnextchar[{\@@rensuji}{\@@rensuji[c]}}
\def\@@rensuji[#1]#2{%
  \ifvmode\leavevmode\fi
  \ifnum\ltjgetparameter{direction}=4~ \hbox{#2}\else
  \hskip\rensujiskip
  \setbox\tw@\hbox{漢}% 「あ」では仮名書体使用時がまずそう
  \@tempdimb\ltjgetht\tw@ \advance\@tempdimb\ltjgetdp\tw@
  \ifnot@advanceline\not@advancelinefalse\else
    \setbox\z@\hbox{\yoko#2}%
    \@tempdima\ltjgetht\z@ \advance\@tempdima\ltjgetdp\z@
    \ifnum\ltjgetparameter{direction}=1~
      % 周囲が dtou の場合には，高さ \ltjgetht\tw@, 深さ \ltjgetdp\tw@ のボックスを基準としている．
      \if #1c\relax\vrule \@width \z@ \@height\dimexpr.5\@tempdima+.5\ltjgetht\tw@-.5\ltjgetdp\tw@
                          \@depth\dimexpr.5\@tempdima-.5\ltjgetht\tw@+.5\ltjgetdp\tw@
      \else\if #1l\relax\vrule\@width \z@\@height\ltjgetht\tw@ \@depth\dimexpr\@tempdima-\ltjgetht\tw@
      \else\vrule\@width \z@ \@height\dimexpr\@tempdima-\ltjgetdp\tw@ \@depth\ltjgetdp\tw@
      \fi\fi
    \else
      % 周囲が tate, utod の場合も同じ
      \if #1c\relax\vrule \@width \z@ \@height\dimexpr.5\@tempdima+.5\ltjgetht\tw@-.5\ltjgetdp\tw@
                          \@depth\dimexpr.5\@tempdima-.5\ltjgetht\tw@+.5\ltjgetdp\tw@
      \else\if #1r\relax\vrule\@width \z@\@height\ltjgetht\tw@ \@depth\dimexpr\@tempdima-\ltjgetht\tw@
      \else\vrule\@width \z@ \@height\dimexpr\@tempdima-\ltjgetdp\tw@ \@depth\ltjgetdp\tw@
      \fi\fi
    \fi
  \fi
  \ifnum\ltjgetparameter{direction}=1~
    \if #1c\relax\hbox to\@tempdimb{\yoko\hss#2\hss\kern-\ltjgetdp\tw@}%
    \else\if #1r\relax\vbox{\hbox to\@tempdimb{\yoko\hss#2\kern-\ltjgetdp\tw@}}%
    \else\lower\ltjgetdp\tw@\vtop{\hbox to\@tempdimb{\yoko#2\hss}}%
    \fi\fi
  \else
    \if #1c\relax\raise\dimexpr.5\@tempdimb-\ltjgetdp\tw@
        \hbox to\@tempdimb{\yoko \hss#2\hss}%
    \else\if #1r\relax\raise\dimexpr.5\@tempdimb-\ltjgetdp\tw@
        \vbox{\hbox to\@tempdimb{\yoko\hss#2}}%
    \else\raise\dimexpr.5\@tempdimb-\ltjgetdp\tw@
         \vtop{\hbox to\@tempdimb{\yoko #2\hss}}%
    \fi\fi
  \fi
  \hskip\rensujiskip
\fi}
\let\Rensuji\rensuji
\let\prensuji\rensuji

%%% kanji
\def\Kanji#1{\expandafter\@Kanji\csname c@#1\endcsname}
\def\@Kanji#1{\kansuji #1}
\def\kanji{\ifnum\ltjgetparameter{direction}=3~ \expandafter\kansuji\fi}

%%% bou
%%%
\def\boutenchar{\char\euc"A1A2}%"
\DeclareRobustCommand\bou[1]{\ifvmode\leavevmode\fi\@bou#1\end}
\def\@bou#1{%
  \ifx#1\end \let\ltj@@next=\relax
  \else
    \ifnum\ltjgetparameter{direction}=3~
      \hbox to\z@{\vbox to\z@{\boxmaxdepth\maxdimen
        \vss\moveleft0.2\zw\hbox{\yoko\boutenchar}\nointerlineskip
        \hbox{\char\euc"A1A1}}\hss}\nobreak#1\relax
    \else
      \hbox to\z@{\vbox to\z@{\boxmaxdepth\maxdimen
        \vss\moveleft-0.2\zw\hbox{\boutenchar}\nointerlineskip
        \hbox{\char\euc"A1A1}}\hss}\nobreak#1\relax
    \fi
    \let\ltj@@next=\@bou
  \fi\ltj@@next}

%%% kasen
\DeclareRobustCommand\kasen[1]{%
  \ifnum\ltjgetparameter{direction}=3~
    \setbox\z@\hbox{#1}\leavevmode\raise.7\zw
    \hbox to\z@{\vrule\@width\wd\z@ \@depth\z@ \@height.4\p@\hss}%
    \box\z@
  \else\underline{#1}\fi}

%%% references
\def\@eqnnum{{\reset@font\rmfamily \normalcolor
  \ifnum\ltjgetparameter{direction}=11~\raise.25\zh\hbox{\yoko(\theequation)}%
  \else (\theequation)\fi}}
\def\@thecounter#1{\noexpand\rensuji{\noexpand\arabic{#1}}}
\def\@thmcounter#1{\noexpand\rensuji{\noexpand\arabic{#1}}}

\ExplSyntaxOff
\endinput