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%
% lltjp-atbegshi.sty
%
\newif\ifltj@ltshipout@avail
\NeedsTeXFormat{LaTeX2e}
\ProvidesPackage{lltjp-atbegshi}[2020-09-13 Patching \string\shipout\space hooks for LuaTeX-ja]
\@ifl@t@r\fmtversion{2020-10-01}{%
\ifnum\patch@level<0\relax \ifnum\patch@level<-6 \ltj@ltshipout@availtrue\fi
\else\ltj@ltshipout@availtrue\fi
}{}
\ifltj@ltshipout@avail\else\RequirePackage{atbegshi}\fi
% concept: execute all hooks inside yoko direction \vbox
\ifltj@ltshipout@avail
%<*ltshipout>-----------------------------------
%
\RequirePackage{expl3}
\ExplSyntaxOn\makeatletter
\box_new:N \l__platex_shipout_dummy_box
\tl_put_left:Nn {\__shipout_execute_cont:}
{\tex_setbox:D \l__platex_shipout_dummy_box \tex_vbox:D \c_group_begin_token \yoko }
\tl_put_right:Nn {\__shipout_execute_cont:} {\c_group_end_token}
\ExplSyntaxOff
%</ltshipout>-----------------------------------
\expandafter\endinput
\fi
\AtBeginShipoutInit
%<*atbegshi>-------------------------------------
% patching atbegshi.sty
%%% following codes are almost copied from
%%% pxatbegshi.sty 2019/09/07 v0.5 (in platex-tools bundle, by H. Yamashita).
%% internal macros are locally effective
\begingroup
% helpers
%% unique tokens
\def\pxabgs@mark{\pxabgs@mark@}
\def\pxabgs@fin{\pxabgs@fin@}
%% \pxabgs@patch@cmd\CMD{<orig>}{<new>}
\def\pxabgs@patch@cmd#1#2#3{%
\ifx#1\relax\else
\def\pxabgs@next##1#2##2\pxabgs@mark##3\pxabgs@fin{%
\ifx\pxabgs@mark##3\pxabgs@mark\let#1\relax
\else
\def\pxabgs@fragment{##2}\def#1{##1#3##2}%
\fi}%
\expandafter\pxabgs@next#1\pxabgs@mark#2\pxabgs@mark\pxabgs@fin
\fi
}
% prepare
\ifdefined\AtBegShi@Output
\let\pxabgs@AtBegShi@Output\AtBegShi@Output
\else\let\pxabgs@AtBegShi@Output\relax\fi
% try first patch
\pxabgs@patch@cmd\pxabgs@AtBegShi@Output
{\let\AtBegShi@OrgProtect\protect}%
{\setbox8\vbox\bgroup\yoko\let\AtBegShi@OrgProtect\protect}
\pxabgs@patch@cmd\pxabgs@AtBegShi@Output
{\AtBeginShipoutOriginalShipout\box\AtBeginShipoutBox}%
{\AtBeginShipoutOriginalShipout\box\AtBeginShipoutBox\egroup}
\pxabgs@patch@cmd\pxabgs@AtBegShi@Output
{%
\begingroup
\setbox\AtBeginShipoutBox\box\AtBeginShipoutBox
\endgroup
\let\protect\AtBegShi@OrgProtect
}{%
\begingroup
\setbox\AtBeginShipoutBox\box\AtBeginShipoutBox
\endgroup
\let\protect\AtBegShi@OrgProtect
\egroup
}
% commit the change only when successful
\ifx\pxabgs@AtBegShi@Output\relax
\@PackageWarningNoLine{lltjp-atbegshi}{%
Failed in patching \string\AtBegShi@Output.\MessageBreak
This may cause error in tate direction%
}
\else
\global\let\AtBegShi@Output\pxabgs@AtBegShi@Output
\fi
\endgroup
%% internal macros are no longer effective
%</atbegshi>-------------------------------------
\endinput
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