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% \iffalse meta-comment
%
%% File: output-patches.dtx (C) Copyright 2020-2023 Frank Mittelbach
%
% It may be distributed and/or modified under the conditions of the
% LaTeX Project Public License (LPPL), either version 1.3c of this
% license or (at your option) any later version. The latest version
% of this license is in the file
%
% https://www.latex-project.org/lppl.txt
%
%<*driver>
\documentclass{l3doc}
\EnableCrossrefs
\CodelineIndex
\begin{document}
\DocInput{output-patches-tmp-ltx.dtx}
\end{document}
%</driver>
%
% \fi
%
% \providecommand\hook[1]{\texttt{#1}}
%
%
%
% \title{Temporary output patches for tagging and better link support}
% \author{Frank Mittelbach \and Ulrike Fischer}
%
% \maketitle
%
% \section{Introduction}
%
% This package contains a few patches of internal \LaTeX{} needed
% to support paragraph tagging across
% page boundaries (in \pdfTeX) and improve the behaviour of links across page breaks.
%
% Until this get properly integrated with the kernel code this has
% to be taken as a prototype and code, interfaces as well as
% behavior may change without notice and certainly without any
% backwards compatibility!
%
%
% \StopEventually{\setlength\IndexMin{200pt} \PrintIndex }
%
%
% \section{The Implementation}
% \begin{macrocode}
%<*package>
% \end{macrocode}
%
% \begin{macrocode}
\ProvidesPackage{output-patches-tmp-ltx}
[2022-10-29 v0.96 Temporary output patches for tagging and better link support]
\RequirePackage{etoolbox}
% \end{macrocode}
%
%
% \subsection{Patching the OR}
% This add hooks around header and footer, in \cs{@makecol} and in multicol.
% At first initialize some of the hooks. We use providecommand to avoid problems if
% the kernel changes here and provides them directly.
% \begin{macrocode}
\providecommand\@kernel@before@head{}
\providecommand\@kernel@before@foot{}
\providecommand\@kernel@after@head{}
\providecommand\@kernel@after@foot{}
\providecommand\@mult@ptagging@hook{}% multicol
% \end{macrocode}
%
% \begin{macrocode}
\patchcmd\@outputpage
{\vfil\color@hbox\normalcolor\hb@xt@\textwidth{\@thehead}\color@endbox}
{\vfil\@kernel@before@head\color@hbox\normalcolor\hb@xt@\textwidth{\@thehead}\color@endbox\@kernel@after@head}
{\typeout{Patching header in \string\@outputpage}}{\PATCHerror }
\patchcmd\@outputpage
{\color@hbox\normalcolor\hb@xt@\textwidth{\@thefoot}\color@endbox}
{\@kernel@before@foot\color@hbox\normalcolor\hb@xt@\textwidth{\@thefoot}\color@endbox\@kernel@after@foot}
{\typeout{Patching footer in \string\@outputpage}}{\PATCHerror }
% \end{macrocode}
%
% \begin{macro}{\@makecol}
% We have to patch \cs{@makecol} in two places:
% \begin{itemize}
% \item
% update 255 up front to add missing tmb/tme if necessary
% \item
% update the \cs{footins} stream if that one got split
% \end{itemize}
%
% If the new latex-lab file for the output routine is loaded it will do the right thing.
% In the other case we patch \cs{@makecol} manually.
% \begin{macrocode}
\@ifpackageloaded{latex-lab-testphase-new-or}
{}
{
\providecommand\@kernel@before@footins{}
\providecommand\@kernel@before@cclv{}
\patchcmd\@makecol
{\vskip\skip\footins}
{\vskip\skip\footins\@kernel@before@footins}
{\typeout{Patching \string\@makecol\space for tagging}}{\PATCHerror }
% for some reason patching with etoolbox only works in this order ...
\pretocmd\@makecol{\@kernel@before@cclv}
{\typeout{Patching \string\@makecol\space for tagging}}{\PATCHerror }
}
% \end{macrocode}
% \end{macro}
%
% \subsection{\pkg{multicol} adjustments}
%
% The patches for pkg{multicol} are fairly minimal:
% \begin{itemize}
% \item At the start of the environment anything already on the
% page is picked up and stored in \cs{partial@page}, we may need to add
% a TMB to that (it should have a proper TME). This has to happen
% in the \enquote{main} stream context.
% \item
% \item
% \end{itemize}
%
% \begin{macrocode}
\AddToHook{package/multicol/after}
{% multicol needs later loading
% \end{macrocode}
%
% \begin{macrocode}
\patchcmd\page@sofar
{\setbox\z@\hbox{p}\global\dimen\tw@\dp\z@}%
{%
\setbox\z@\hbox{p}\global\dimen\tw@\dp\z@
\@mult@ptagging@hook
}%
{\typeout{Patching \string\page@sofar\space for tagging}}{\PATCHerror}%
}
% \end{macrocode}
%
% \subsection{Interrupt hooks}
% This requires the l3pdfannot module!
% We add the code here and not in hyperref, as it should also work with links
% created directly with the l3pdfannot commands. The file is only
% loaded by the pdfmanagement, so no need to test if the commands exist.
% \begin{macrocode}
\ExplSyntaxOn
\def\@kernel@before@head{\pdfannot_link_off:}
\def\@kernel@before@foot{\pdfannot_link_off:}
\def\@kernel@after@head {\pdfannot_link_on:}
\def\@kernel@after@foot {\pdfannot_link_on:}
\ExplSyntaxOff
% \end{macrocode}
%
% \begin{macrocode}
%</package>
% \end{macrocode}
% \begin{macrocode}
%<*latex-lab>
\ProvidesFile{new-or-1-latex-lab-testphase.ltx}
[2022-10-26 v0.8 Temporary output patches for tagging and better link support]
\RequirePackage{latex-lab-testphase-new-or-1}
%</latex-lab>
% \end{macrocode}
% \Finale
%
|
