+%%%%%%%% \yoko, \tate, \ifydir, \iftdir
+\newif\ifydir
+\newif\iftdir
+\newif\ifddir
+\protected\def\tate{%
+ \directlua{luatexja.direction.set_list_direction(3, 'tate')}%
+ \ltj@dir@count=3\tdirtrue\ydirfalse\ddirfalse}
+\protected\def\yoko{%
+ \directlua{luatexja.direction.set_list_direction(4, 'yoko')}%
+ \ltj@dir@count=4\ydirtrue\tdirfalse\ddirfalse}
+\protected\def\dtou{%
+ \directlua{luatexja.direction.set_list_direction(1, 'dtou')}%
+ \ltj@dir@count=1\ydirfalse\tdirfalse\ddirtrue}
+\yoko
+
+%%%%%%%% \ltjgetwd<box_num> etc.
+%\def\ltjgetwd{\expandafter\expandafter\expandafter\ltj@@getwd\ltj@grab@num}
+%\def\ltjgetht{\expandafter\expandafter\expandafter\ltj@@getht\ltj@grab@num}
+%\def\ltjgetdp{\expandafter\expandafter\expandafter\ltj@@getdp\ltj@grab@num}
+\def\ltj@@getwd#1{%
+ \directlua{luatexja.direction.get_box_dim('width', \the\numexpr#1\relax)}%
+ \ltj@tempdima%
+}
+\def\ltj@@getht#1{%
+ \directlua{luatexja.direction.get_box_dim('height', \the\numexpr#1\relax)}%
+ \ltj@tempdima%
+}
+\def\ltj@@getdp#1{%
+ \directlua{luatexja.direction.get_box_dim('depth', \the\numexpr#1\relax)}%
+ \ltj@tempdima%
+}
+\let\ltjgetwd=\ltj@@getwd\let\ltjgetht=\ltj@@getht\let\ltjgetdp=\ltj@@getdp
+
+%%%%%%%% \ltjsetwd<box_num>=<dimen> etc.
+\protected\def\ltjsetwd{\begingroup
+ \ltj@reset@globaldefs\afterassignment\ltj@@setwd@a\ltj@tempcnta}
+\def\ltj@@setwd@a{\afterassignment\ltj@@setwd@b\ltj@tempdima}
+\def\ltj@@setwd@b{%
+ \directlua{luatexja.direction.set_box_dim('width')}%
+ \ltj@restore@globaldefs\endgroup}
+\protected\def\ltjsetht{\begingroup
+ \ltj@reset@globaldefs\afterassignment\ltj@@setht@a\ltj@tempcnta}
+\def\ltj@@setht@a{\afterassignment\ltj@@setht@b\ltj@tempdima}
+\def\ltj@@setht@b{%
+ \directlua{luatexja.direction.set_box_dim('height')}%
+ \ltj@restore@globaldefs\endgroup}
+\protected\def\ltjsetdp{\begingroup
+ \ltj@reset@globaldefs\afterassignment\ltj@@setdp@a\ltj@tempcnta}
+\def\ltj@@setdp@a{\afterassignment\ltj@@setdp@b\ltj@tempdima}
+\def\ltj@@setdp@b{%
+ \directlua{luatexja.direction.set_box_dim('depth')}%
+ \ltj@restore@globaldefs\endgroup}
+
+%%%%%%%% \ifybox, \iftbox, \ifdbox
+\def\ltj@@box@cond#1#2\fi{\fi\csname if#1\endcsname}
+\def\ifybox#1{\directlua{luatexja.direction.dir_conditional(\the\numexpr #1\relax, 4)}%
+ \ltj@@box@cond{true}\else\ltj@@box@cond{false}\fi}
+\def\iftbox#1{\directlua{luatexja.direction.dir_conditional(\the\numexpr #1\relax, 3)}%
+ \ltj@@box@cond{true}\else\ltj@@box@cond{false}\fi}
+\def\ifdbox#1{\directlua{luatexja.direction.dir_conditional(\the\numexpr #1\relax, 1)}%
+ \ltj@@box@cond{true}\else\ltj@@box@cond{false}\fi}
+