src/patches/lltjp-atbegshi.sty

   1 %
   2 % lltjp-atbegshi.sty
   3 %
   4
   5 \NeedsTeXFormat{LaTeX2e}
   6 \ProvidesPackage{lltjp-atbegshi}[2021-04-29 Patching \string\shipout\space hooks for LuaTeX-ja]
   7
   8 % concept: execute all hooks inside yoko direction \vbox
   9
  10 \ifltj@ltfilehook@avail
  11 %<*ltshipout>-----------------------------------
  12 %
  13 \RequirePackage{expl3}
  14 \ExplSyntaxOn\makeatletter
  15 \box_new:N \l__platex_shipout_dummy_box
  16 \if_cs_exist:N \__shipout_execute_main_cont:Nnnn %% 2021-06-01
  17 \cs_new_eq:NN \__platex_original_shipout_execute_main_cont:Nnnn
  18               \__shipout_execute_main_cont:Nnnn
  19 \cs_set:Npn \__shipout_execute_main_cont:Nnnn #1#2#3#4 {
  20   % if the box #1 is not a \yoko-box (= horizontal writing),
  21   % then make it a \yoko-box behorehand.
  22   \platex_if_box_yoko:NF #1 {
  23     \vbox_set:Nn #1 { \platex_direction_yoko: \box_use:N #1 }
  24   }
  25   % if the current direction is not \yoko,
  26   % then enclose \__shipout_execute_main_cont:Nnnn with
  27   % a dummy \yoko-box named \l__platex_shipout_dummy_box.
  28   \platex_if_direction_yoko:TF {
  29     \__platex_original_shipout_execute_main_cont:Nnnn { #1 } { #2 } { #3 } { #4 }
  30   }{
  31     \vbox_set:Nn \l__platex_shipout_dummy_box {
  32       \platex_direction_yoko:
  33       \__platex_original_shipout_execute_main_cont:Nnnn { #1 } { #2 } { #3 } { #4 }
  34     }
  35     % [Limitation] the code above may discard some contents,
  36     % so we'd like to put it back by \box\l__platex_shipout_dummy_box.
  37     % however, an infinite loop occurs if we uncomment the line below
  38     % so we can't.
  39     %\box_use:N \l__platex_shipout_dummy_box
  40   }
  41 }
  42
  43 \else: %% 2020-10-01
  44 \cs_new_eq:NN \__platex_original_shipout_execute_cont: \__shipout_execute_cont:
  45 \cs_set:Npn \__shipout_execute_cont:
  46 {
  47   \platex_if_box_yoko:NF \l_shipout_box {
  48     \vbox_set:Nn \l_shipout_box { \platex_direction_yoko: \box_use:N \l_shipout_box }
  49   }
  50   \platex_if_direction_yoko:TF {
  51     \__platex_original_shipout_execute_cont:
  52   }{
  53     \vbox_set:Nn \l__platex_shipout_dummy_box {
  54       \platex_direction_yoko: \__platex_original_shipout_execute_cont:
  55     }
  56   }
  57 }
  58 \fi:
  59 %</ltshipout>-----------------------------------
  60 \ExplSyntaxOff
  61 \expandafter\endinput
  62 \fi
  63 \RequirePackage{atbegshi}
  64 %<*atbegshi>-------------------------------------
  65 % patching atbegshi.sty
  66 %%%  following codes are almost copied from
  67 %%%  pxatbegshi.sty 2019/09/07 v0.5 (in platex-tools bundle, by H. Yamashita).
  68
  69 \ifdefined\AtBeginShipoutOriginalShipout
  70   \let\AtBeginShipoutOriginalShipout\ltj@shipout
  71 \fi
  72 \AtBeginShipoutInit
  73 \DeclareRobustCommand \AtBeginDvi [1]{%
  74   \global \setbox \@begindvibox
  75     \vbox{\yoko\unvbox \@begindvibox #1}%
  76 }
  77 %% internal macros are locally effective
  78 \begingroup
  79
  80 % helpers
  81 %% unique tokens
  82 \def\pxabgs@mark{\pxabgs@mark@}
  83 \def\pxabgs@fin{\pxabgs@fin@}
  84
  85 %% \pxabgs@patch@cmd\CMD{<orig>}{<new>}
  86 \def\pxabgs@patch@cmd#1#2#3{%
  87   \ifx#1\relax\else
  88   \def\pxabgs@next##1#2##2\pxabgs@mark##3\pxabgs@fin{%
  89     \ifx\pxabgs@mark##3\pxabgs@mark\let#1\relax
  90     \else
  91       \def\pxabgs@fragment{##2}\def#1{##1#3##2}%
  92     \fi}%
  93   \expandafter\pxabgs@next#1\pxabgs@mark#2\pxabgs@mark\pxabgs@fin
  94   \fi
  95 }
  96
  97 % prepare
  98 \ifdefined\AtBegShi@Output
  99   \let\pxabgs@AtBegShi@Output\AtBegShi@Output
 100 \else\let\pxabgs@AtBegShi@Output\relax\fi
 101 % try first patch
 102 \pxabgs@patch@cmd\pxabgs@AtBegShi@Output
 103   {\let\AtBegShi@OrgProtect\protect}%
 104   {\setbox8\vbox\bgroup\yoko\let\AtBegShi@OrgProtect\protect}
 105 \pxabgs@patch@cmd\pxabgs@AtBegShi@Output
 106   {\AtBeginShipoutOriginalShipout\box\AtBeginShipoutBox}%
 107   {\AtBeginShipoutOriginalShipout\box\AtBeginShipoutBox\egroup}
 108 \pxabgs@patch@cmd\pxabgs@AtBegShi@Output
 109   {%
 110     \begingroup
 111       \setbox\AtBeginShipoutBox\box\AtBeginShipoutBox
 112     \endgroup
 113     \let\protect\AtBegShi@OrgProtect
 114   }{%
 115     \begingroup
 116       \setbox\AtBeginShipoutBox\box\AtBeginShipoutBox
 117     \endgroup
 118     \let\protect\AtBegShi@OrgProtect
 119     \egroup
 120   }
 121 % commit the change only when successful
 122 \ifx\pxabgs@AtBegShi@Output\relax
 123   \@PackageWarningNoLine{lltjp-atbegshi}{%
 124     Failed in patching \string\AtBegShi@Output.\MessageBreak
 125     This may cause error in tate direction%
 126   }
 127 \else
 128   \global\let\AtBegShi@Output\pxabgs@AtBegShi@Output
 129 \fi
 130
 131 \endgroup
 132 %% internal macros are no longer effective
 133 %</atbegshi>-------------------------------------
 134 \endinput